LOANS AND ALLOWANCE FOR LOAN LOSSES - Narrative (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
contract
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Owner-occupied loans to commercial real estate loans 53.50%      
Maximum loans amount to appraised value 90.00%      
Impaired, interest lost on nonaccrual loans $ 892 $ 404    
Average recorded investment 22,521 12,064 $ 9,100  
Interest income, accrual method 862 693 405  
Loans and leases receivable, allowance $ 17,911 $ 13,098 8,246 $ 6,655
Loans and leases receivable, allowance, percentage 0.95% 0.78%    
Modifications, recorded investment $ 12,600 $ 3,100    
Change in method of calculating impairment 879 681    
Impaired, commitment to lend 0      
Troubled debt restructuring, write-down $ 211 $ 45 $ 38  
Subsequent default, number of contracts | contract 0      
Troubled debt restructuring, addition $ 10,900      
Troubled debt restructuring, addition, outstanding $ 10,800      
Minimum        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Owner-occupied commercial real estate loans, amortization period 10 years      
Mortgage loan, term 5 years      
Mortgage loan, amortization period 10 years      
Consumer and other loans, term 12 months      
Maximum        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Owner-occupied commercial real estate loans, amortization period 20 years      
Mortgage loan, term 7 years      
Mortgage loan, amortization period 20 years      
Consumer and other loans, term 60 months