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LOANS AND ALLOWANCE FOR CREDIT LOSSES (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
contract
May 19, 2017
USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]      
Financing receivable, modifications, post-modification recorded investment   $ 1,100  
Financing receivable, modifications, number of contracts | contract   2  
Financing receivable, recorded investment, nonaccrual status $ 16,655 $ 4,971  
Mortgage loans in process of foreclosure, amount 949 530  
Loans and leases receivable, net amount, total 1,185,012 1,083,733  
Financing receivable origination fee, net 789 609  
Other real estate owned, net $ 1,222 $ 1,794  
Allowance from loan losses, as a percentage of total loans 0.87% 0.89%  
Directors, Associates and Policy Making Officers [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans and leases receivable, related parties $ 13,200 $ 13,800  
Loans and leases receivable, related parties, additions 1,900 2,300  
Loans and leases receivable, related parties, proceeds 2,600 1,800  
Residential Portfolio Segment [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Financing receivable, recorded investment, nonaccrual status 4,099 1,482  
Northwest Bank Branches [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Financing Receivable Net of Allowance     $ 122,862
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Financing Receivable Net Of Discount 92,800 108,100  
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Financing Receivable, Related Discount $ 1,400 $ 1,800