Loans and Allowance for Loan Losses (Credit Risk Exposure Indicators by Portfolio Segment) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]      
Loans $ 1,772,610 $ 1,580,402 $ 1,563,866
Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 1,423,906 1,203,143  
Performing Financing Receivable      
Financing Receivable, Recorded Investment [Line Items]      
Loans 286,954 288,269  
Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 14,292 22,260  
Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Loans 45,446 64,718  
Nonperforming Financing Receivable      
Financing Receivable, Recorded Investment [Line Items]      
Loans 2,012 2,012  
Residential real estate loans      
Financing Receivable, Recorded Investment [Line Items]      
Loans 585,468 569,819 572,173
Residential real estate loans | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 572,589 551,035  
Residential real estate loans | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 3,579 3,196  
Residential real estate loans | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Loans 9,300 15,588  
Commercial real estate loans      
Financing Receivable, Recorded Investment [Line Items]      
Loans 640,661 541,099 506,231
Commercial real estate loans | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 606,387 496,257  
Commercial real estate loans | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 4,690 7,749  
Commercial real estate loans | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Loans 29,584 37,093  
Commercial loans      
Financing Receivable, Recorded Investment [Line Items]      
Loans 257,515 179,203 190,454
Commercial loans | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 244,930 155,851  
Commercial loans | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 6,023 11,315  
Commercial loans | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Loans 6,562 12,037  
Home equity loans      
Financing Receivable, Recorded Investment [Line Items]      
Loans 271,709 272,630 278,375
Home equity loans | Performing Financing Receivable      
Financing Receivable, Recorded Investment [Line Items]      
Loans 269,968 271,059  
Home equity loans | Nonperforming Financing Receivable      
Financing Receivable, Recorded Investment [Line Items]      
Loans 1,741 1,571  
Consumer loans      
Financing Receivable, Recorded Investment [Line Items]      
Loans 17,257 17,651 16,633
Consumer loans | Performing Financing Receivable      
Financing Receivable, Recorded Investment [Line Items]      
Loans 16,986 17,210  
Consumer loans | Nonperforming Financing Receivable      
Financing Receivable, Recorded Investment [Line Items]      
Loans $ 271 $ 441