Retirement Benefit Plans (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets $ 45,704 $ 45,704   $ 47,234 $ 45,704
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 45,704        
Fair Value of Plan Assets, End of Period 47,234 45,704      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets $ 45,704 $ 45,704   $ 47,234 $ 45,704
Percent of Total       100.00% 100.00%
Expected Future Benefit Payments [Abstract]          
Health Care Cost Trend Rate Assumed for Next Year 7.75% 8.00%      
Rate to which the Cost Trend Rate is Assumed to Decline (the Ultimate Trend Rate) 3.89% 3.89%      
Year that the Rate Reaches the Ultimate Trend Rate       2075 2075
Effect of One Percentage Point Increase on Service and Interest Cost Components $ 73        
Effect of One Percentage Point Decrease on Service and Interest Cost Components 61        
Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation 541        
Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation 466        
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 45,704 $ 45,704   $ 47,234 $ 45,704
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 45,704        
Fair Value of Plan Assets, End of Period 47,234 45,704      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 45,704 45,704   47,234 45,704
Significant Other Observable Inputs (Level 2) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 0        
Fair Value of Plan Assets, End of Period 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Significant Unobservable Inputs (Level 3) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 0        
Fair Value of Plan Assets, End of Period 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Cash and Cash Equivalents [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 20 20   44 20
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 20        
Fair Value of Plan Assets, End of Period 44 20      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets $ 20 $ 20   $ 44 $ 20
Percent of Total       0.10% 0.00%
Target Allocation Minimum, Percentage 0.00% 0.00%      
Target Allocation Maximum, Percentage 15.00% 15.00%      
Cash and Cash Equivalents [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets $ 20 $ 20   $ 44 $ 20
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 20        
Fair Value of Plan Assets, End of Period 44 20      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 20 20   44 20
Cash and Cash Equivalents [Member] | Significant Other Observable Inputs (Level 2) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 0        
Fair Value of Plan Assets, End of Period 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Cash and Cash Equivalents [Member] | Significant Unobservable Inputs (Level 3) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 0        
Fair Value of Plan Assets, End of Period 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Money Market Funds [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 4,322 4,322   2,471 4,322
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 4,322        
Fair Value of Plan Assets, End of Period 2,471 4,322      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets $ 4,322 $ 4,322   $ 2,471 $ 4,322
Percent of Total       5.20% 9.50%
Target Allocation Minimum, Percentage 0.00% 0.00%      
Target Allocation Maximum, Percentage 15.00% 15.00%      
Money Market Funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets $ 4,322 $ 4,322   $ 2,471 $ 4,322
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 4,322        
Fair Value of Plan Assets, End of Period 2,471 4,322      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 4,322 4,322   2,471 4,322
Money Market Funds [Member] | Significant Other Observable Inputs (Level 2) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 0        
Fair Value of Plan Assets, End of Period 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Money Market Funds [Member] | Significant Unobservable Inputs (Level 3) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 0        
Fair Value of Plan Assets, End of Period 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Common Stock          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 4,551 4,551   4,554 4,551
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 4,551        
Fair Value of Plan Assets, End of Period 4,554 4,551      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets $ 4,551 $ 4,551   $ 4,554 $ 4,551
Percent of Total       9.60% [1] 10.00%
Target Allocation Minimum, Percentage 0.00% 0.00%      
Target Allocation Maximum, Percentage 10.00% 10.00%      
Common Stock | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets $ 4,551 $ 4,551   $ 4,554 $ 4,551
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 4,551        
Fair Value of Plan Assets, End of Period 4,554 4,551      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 4,551 4,551   4,554 4,551
Common Stock | Significant Other Observable Inputs (Level 2) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 0        
Fair Value of Plan Assets, End of Period 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Common Stock | Significant Unobservable Inputs (Level 3) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 0        
Fair Value of Plan Assets, End of Period 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Equity Funds [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 29,929 29,929   32,819 29,929
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 29,929        
Fair Value of Plan Assets, End of Period 32,819 29,929      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets $ 29,929 $ 29,929   $ 32,819 $ 29,929
Percent of Total       69.50% 65.40%
Target Allocation Minimum, Percentage 55.00% 66.00%      
Target Allocation Maximum, Percentage 85.00% 85.00%      
Equity Funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets $ 29,929 $ 29,929   $ 32,819 $ 29,929
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 29,929        
Fair Value of Plan Assets, End of Period 32,819 29,929      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 29,929 29,929   32,819 29,929
Equity Funds [Member] | Significant Other Observable Inputs (Level 2) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 0        
Fair Value of Plan Assets, End of Period 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Equity Funds [Member] | Significant Unobservable Inputs (Level 3) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 0        
Fair Value of Plan Assets, End of Period 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Equity Funds [Member] | North Country Funds - Equity [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets [2] 18,975 18,975   19,625 18,975
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period [2] 18,975        
Fair Value of Plan Assets, End of Period [2] 19,625 18,975      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets [2] $ 18,975 $ 18,975   $ 19,625 $ 18,975
Percent of Total [2]       41.60% 41.40%
Target Allocation Minimum, Percentage      
Target Allocation Maximum, Percentage      
Equity Funds [Member] | North Country Funds - Equity [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets [2] $ 18,975 $ 18,975   $ 19,625 $ 18,975
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period [2] 18,975        
Fair Value of Plan Assets, End of Period [2] 19,625 18,975      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets [2] 18,975 18,975   19,625 18,975
Equity Funds [Member] | North Country Funds - Equity [Member] | Significant Other Observable Inputs (Level 2) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets [2] 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period [2] 0        
Fair Value of Plan Assets, End of Period [2] 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets [2] 0 0   0 0
Equity Funds [Member] | North Country Funds - Equity [Member] | Significant Unobservable Inputs (Level 3) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets [2] 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period [2] 0        
Fair Value of Plan Assets, End of Period [2] 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets [2] 0 0   0 0
Equity Funds [Member] | Other Mutual Funds - Equity [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 10,954 10,954   13,194 10,954
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 10,954        
Fair Value of Plan Assets, End of Period 13,194 10,954      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets $ 10,954 $ 10,954   $ 13,194 $ 10,954
Percent of Total       27.90% 24.00%
Target Allocation Minimum, Percentage      
Target Allocation Maximum, Percentage      
Equity Funds [Member] | Other Mutual Funds - Equity [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets $ 10,954 $ 10,954   $ 13,194 $ 10,954
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 10,954        
Fair Value of Plan Assets, End of Period 13,194 10,954      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 10,954 10,954   13,194 10,954
Equity Funds [Member] | Other Mutual Funds - Equity [Member] | Significant Other Observable Inputs (Level 2) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 0        
Fair Value of Plan Assets, End of Period 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Equity Funds [Member] | Other Mutual Funds - Equity [Member] | Significant Unobservable Inputs (Level 3) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 0        
Fair Value of Plan Assets, End of Period 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Fixed Income Funds [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 6,882 6,882   7,346 6,882
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 6,882        
Fair Value of Plan Assets, End of Period 7,346 6,882      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets $ 6,882 $ 6,882   $ 7,346 $ 6,882
Percent of Total       15.60% 15.10%
Target Allocation Minimum, Percentage 15.00% 15.00%      
Target Allocation Maximum, Percentage 30.00% 30.00%      
Fixed Income Funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets $ 6,882 $ 6,882   $ 7,346 $ 6,882
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 6,882        
Fair Value of Plan Assets, End of Period 7,346 6,882      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 6,882 6,882   7,346 6,882
Fixed Income Funds [Member] | Significant Other Observable Inputs (Level 2) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 0        
Fair Value of Plan Assets, End of Period 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Fixed Income Funds [Member] | Significant Unobservable Inputs (Level 3) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 0        
Fair Value of Plan Assets, End of Period 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Fixed Income Funds [Member] | North Country Funds - Fixed Income [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets [2] 5,436 5,436   7,346 5,436
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period [2] 5,436        
Fair Value of Plan Assets, End of Period [2] 7,346 5,436      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets [2] $ 5,436 $ 5,436   $ 7,346 $ 5,436
Percent of Total [2]       15.60% 11.90%
Target Allocation Minimum, Percentage      
Target Allocation Maximum, Percentage      
Fixed Income Funds [Member] | North Country Funds - Fixed Income [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets [2] $ 5,436 $ 5,436   $ 7,346 $ 5,436
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period [2] 5,436        
Fair Value of Plan Assets, End of Period [2] 7,346 5,436      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets [2] 5,436 5,436   7,346 5,436
Fixed Income Funds [Member] | North Country Funds - Fixed Income [Member] | Significant Other Observable Inputs (Level 2) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets [2] 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period [2] 0        
Fair Value of Plan Assets, End of Period [2] 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets [2] 0 0   0 0
Fixed Income Funds [Member] | North Country Funds - Fixed Income [Member] | Significant Unobservable Inputs (Level 3) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets [2] 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period [2] 0        
Fair Value of Plan Assets, End of Period [2] 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets [2] 0 0   0 0
Fixed Income Funds [Member] | Other Mutual Funds - Fixed Income [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 1,446 1,446   0 1,446
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 1,446        
Fair Value of Plan Assets, End of Period 0 1,446      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets $ 1,446 $ 1,446   $ 0 $ 1,446
Percent of Total       0.00% 3.20%
Target Allocation Minimum, Percentage      
Target Allocation Maximum, Percentage      
Fixed Income Funds [Member] | Other Mutual Funds - Fixed Income [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets $ 1,446 $ 1,446   $ 0 $ 1,446
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 1,446        
Fair Value of Plan Assets, End of Period 0 1,446      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 1,446 1,446   0 1,446
Fixed Income Funds [Member] | Other Mutual Funds - Fixed Income [Member] | Significant Other Observable Inputs (Level 2) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 0        
Fair Value of Plan Assets, End of Period 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Fixed Income Funds [Member] | Other Mutual Funds - Fixed Income [Member] | Significant Unobservable Inputs (Level 3) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 0        
Fair Value of Plan Assets, End of Period 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Employees' Pension Plan [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 45,704 44,653 $ 44,653 47,234 45,704
Benefit Obligation 36,966 33,259 33,259 35,982 36,966
Funded Status of Plan       11,252 8,738
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]          
Benefit Obligation, Beginning of Period 36,966 33,259      
Service Cost 1,503 1,410 1,506    
Interest Cost 1,545 1,621 1,261    
Plan Participants' Contributions 0 0      
Amendments 277 0      
Actuarial Loss (1,670) 2,909      
Benefits Paid (2,639) (2,233)      
Benefit Obligation, End of Period 35,982 36,966 33,259    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 45,704 44,653      
Actual Return on Plan Assets 1,169 3,284      
Contributions to Pension Plans 3,000 0      
Plan Participants' Contributions 0 0      
Benefits Paid (2,639) (2,233)      
Fair Value of Plan Assets, End of Period 47,234 45,704 44,653    
Accumulated Benefit Obligation at December 31, 2012       35,582  
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]          
Prepaid Benefit Cost       11,252 8,738
Accrued Benefit Liability       0 0
Net Benefit Cost Recognized       11,252 8,738
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]          
Net Retirement Plan Loss, Before-Tax Amount 472 2,855 (8,438)    
Net prior Service Cost Arising During the Period 277 0 0    
Amortization of Net Loss (601) (356) (1,231)    
Accretion of Net Retirement Plan Prior Service Credit, Tax (Expense) Benefit 83 45 (37)    
Total Other Comprehensive (Loss) Income for Pension and Other Postretirement Benefit Plans 231 2,544 (9,706)    
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]          
Net Actuarial Loss       10,727 10,856
Prior Service (Credit) Cost       150 (210)
Total Accumulated Other Comprehensive Income, Before Tax       $ 10,877 $ 10,646
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]          
Net Actuarial Loss 559        
Prior Service (Credit) Cost (57)        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]          
Service Cost 1,503 1,410 1,506    
Interest Cost 1,545 1,621 1,261    
Expected Return on Plan Assets (3,311) (3,230) (2,889)    
Amortization of Prior Service (Credit) Cost (83) (45) 37    
Amortization of Net Loss 601 356 1,232    
Net Periodic Benefit Cost $ 255 $ 112 $ 1,147    
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]          
Discount Rate       4.73% 4.31%
Rate of Compensation Increase       3.50% 3.50%
Interest Rate Credit for Determining Projected Cash Balance Account       3.03% 3.04%
Interest Rate to Annuitize Cash Balance Account       5.00% 4.75%
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Account       5.00% 4.75%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Discount Rate 4.31% 5.10% 3.55%    
Expected Long-Term Return on Assets 7.50% 7.50% 7.50%    
Rate of Compensation Increase 3.50% 3.50% 3.50%    
Interest Rate Credit for Determining Projected Cash Balance Account 3.04% 4.00% 3.00%    
Interest Rate to Annuitize Cash Balance Account 4.75% 5.25% 4.50%    
Interest Rate to Convert Accuities to Actuarially Equivalent Lump Sum Amounts 4.75% 5.25% 4.50%    
Fair Value of Plan Assets $ 45,704 $ 44,653 $ 44,653 $ 47,234 $ 45,704
Expected Future Benefit Payments [Abstract]          
2016       2,264  
2017       2,254  
2018       2,195  
2019       2,353  
2020       2,566  
2021- 2025       13,477  
Estimated Contributions During 2015 0        
Select Executive Retirement Plan [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 0 0 0 0 0
Benefit Obligation 5,072 4,459 4,459 4,784 5,072
Funded Status of Plan       (4,784) (5,072)
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]          
Benefit Obligation, Beginning of Period 5,072 4,459      
Service Cost 32 10 0    
Interest Cost 211 206 163    
Plan Participants' Contributions 0 0      
Amendments 91 0      
Actuarial Loss (152) 870      
Benefits Paid (470) (473)      
Benefit Obligation, End of Period 4,784 5,072 4,459    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 0 0      
Actual Return on Plan Assets 0 0      
Contributions to Pension Plans 470 473      
Plan Participants' Contributions 0 0      
Benefits Paid (470) (473)      
Fair Value of Plan Assets, End of Period 0 0 0    
Accumulated Benefit Obligation at December 31, 2012       4,784  
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]          
Prepaid Benefit Cost       0 0
Accrued Benefit Liability       (4,784) (5,072)
Net Benefit Cost Recognized       (4,784) (5,072)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]          
Net Retirement Plan Loss, Before-Tax Amount (152) 871 (554)    
Net prior Service Cost Arising During the Period 91 0 0    
Amortization of Net Loss (131) (93) (140)    
Accretion of Net Retirement Plan Prior Service Credit, Tax (Expense) Benefit (58) (72) (79)    
Total Other Comprehensive (Loss) Income for Pension and Other Postretirement Benefit Plans (250) 706 (773)    
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]          
Net Actuarial Loss       2,169 2,452
Prior Service (Credit) Cost       603 570
Total Accumulated Other Comprehensive Income, Before Tax       $ 2,772 $ 3,022
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]          
Net Actuarial Loss 112        
Prior Service (Credit) Cost 57        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]          
Service Cost 32 10 0    
Interest Cost 211 206 163    
Expected Return on Plan Assets 0 0 0    
Amortization of Prior Service (Credit) Cost 58 72 79    
Amortization of Net Loss 131 93 139    
Net Periodic Benefit Cost $ 432 $ 381 $ 381    
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]          
Discount Rate       4.61% 4.26%
Rate of Compensation Increase       3.00% 3.50%
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Account       5.00% 4.75%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Discount Rate 4.26% 4.85% 3.15%    
Rate of Compensation Increase 3.50% 3.50% 3.50%    
Interest Rate to Convert Accuities to Actuarially Equivalent Lump Sum Amounts 4.75% 5.25% 4.50%    
Fair Value of Plan Assets $ 0 $ 0 $ 0 $ 0 $ 0
Expected Future Benefit Payments [Abstract]          
2016       443  
2017       433  
2018       422  
2019       410  
2020       397  
2021- 2025       1,814  
Estimated Contributions During 2015 443        
Postretirement Benefit Plans [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 0 0 0 0 0
Benefit Obligation 9,170 7,619 7,619 7,701 9,170
Funded Status of Plan       (7,701) (9,170)
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]          
Benefit Obligation, Beginning of Period 9,170 7,619      
Service Cost 250 173 211    
Interest Cost 394 374 308    
Plan Participants' Contributions 481 383      
Amendments 0 570      
Actuarial Loss (1,715) 884      
Benefits Paid (879) (833)      
Benefit Obligation, End of Period 7,701 9,170 7,619    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 0 0      
Actual Return on Plan Assets 0 0      
Contributions to Pension Plans 398 450      
Plan Participants' Contributions 481 383      
Benefits Paid (879) (833)      
Fair Value of Plan Assets, End of Period 0 0 0    
Accumulated Benefit Obligation at December 31, 2012       7,701  
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]          
Prepaid Benefit Cost       0 0
Accrued Benefit Liability       (7,701) (9,170)
Net Benefit Cost Recognized       (7,701) (9,170)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]          
Net Retirement Plan Loss, Before-Tax Amount (1,715) 884 (1,648)    
Net prior Service Cost Arising During the Period 0 570 0    
Amortization of Net Loss (114) (25) (142)    
Accretion of Net Retirement Plan Prior Service Credit, Tax (Expense) Benefit 31 114 114    
Total Other Comprehensive (Loss) Income for Pension and Other Postretirement Benefit Plans (1,798) 1,543 (1,676)    
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]          
Net Actuarial Loss       90 1,919
Prior Service (Credit) Cost       410 379
Total Accumulated Other Comprehensive Income, Before Tax       $ 500 $ 2,298
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]          
Net Actuarial Loss 0        
Prior Service (Credit) Cost (12)        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]          
Service Cost 250 173 211    
Interest Cost 394 374 308    
Expected Return on Plan Assets 0 0 0    
Amortization of Prior Service (Credit) Cost (31) (114) (114)    
Amortization of Net Loss 114 25 142    
Net Periodic Benefit Cost $ 727 $ 458 $ 547    
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]          
Discount Rate       4.69% 4.31%
Rate of Compensation Increase       3.50% 3.50%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Discount Rate 4.31% 5.10% 3.55%    
Rate of Compensation Increase 3.50% 3.50% 3.50%    
Fair Value of Plan Assets $ 0 $ 0 $ 0 $ 0 $ 0
Expected Future Benefit Payments [Abstract]          
2016       539  
2017       523  
2018       545  
2019       568  
2020       566  
2021- 2025       $ 2,944  
Estimated Contributions During 2015 $ 539        
[1] Acquisition of Arrow Financial Corporation common stock was under 10% of the total fair value of the employee's pension plan assets at the time of acquisition.
[2] The North Country Funds - Equity and the North Country Funds - Fixed Income are publicly traded mutual funds advised by Arrow's subsidiary, North Country Investment Advisers, Inc.