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LOANS, Loan Summary (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Loans receivable, net [Abstract]        
Gross loans, including deferred origination costs $ 6,281,121 $ 6,256,757    
Allowance for loan losses (49,284) (47,583) $ (47,233) $ (45,401)
Net loans 6,231,837 6,209,174    
Net deferred loan origination costs 28,400 25,300    
Loans receivable, related parties [Roll Forward]        
Balance at beginning of year 22,344 10,950    
New loans 2,600 16,617    
Payments (4,283) (5,223)    
Balance at end of year 20,661 22,344    
Business Lending [Member]        
Loans receivable, net [Abstract]        
Gross loans, including deferred origination costs $ 2,396,977 2,424,223    
Consumer Mortgage [Member] | Minimum [Member]        
Loans receivable, net [Abstract]        
Typical contract term 10 years      
Consumer Mortgage [Member] | Maximum [Member]        
Loans receivable, net [Abstract]        
Typical contract term 30 years      
Home Equity [Member] | Maximum [Member]        
Loans receivable, net [Abstract]        
Typical contract term 30 years      
Residential Portfolio Segment [Member] | Consumer Mortgage [Member]        
Loans receivable, net [Abstract]        
Gross loans, including deferred origination costs $ 2,235,408 2,220,298    
Allowance for loan losses (10,124) (10,465) (10,094) (10,198)
Commercial Portfolio Segment [Member] | Business Lending [Member]        
Loans receivable, net [Abstract]        
Gross loans, including deferred origination costs 2,396,977 2,424,223    
Allowance for loan losses (18,522) (17,257) (17,220) (15,749)
Consumer Portfolio Segment [Member] | Consumer Indirect [Member]        
Loans receivable, net [Abstract]        
Gross loans, including deferred origination costs 1,083,207 1,011,978    
Allowance for loan losses (14,366) (13,468) (13,782) (12,422)
Consumer Portfolio Segment [Member] | Consumer Direct [Member]        
Loans receivable, net [Abstract]        
Gross loans, including deferred origination costs 178,820 179,929    
Allowance for loan losses (3,095) (3,039) (2,979) (2,997)
Consumer Portfolio Segment [Member] | Home Equity [Member]        
Loans receivable, net [Abstract]        
Gross loans, including deferred origination costs 386,709 420,329    
Allowance for loan losses $ (2,144) $ (2,107) $ (2,399) $ (2,666)