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LOANS, Loan Summary (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Loans receivable, net [Abstract]        
Gross loans, including deferred origination costs $ 6,890,543 $ 6,281,121    
Allowance for loan losses (49,911) (49,284) $ (47,583) $ (47,233)
Net loans 6,840,632 6,231,837    
Net deferred loan origination costs 32,300 28,400    
Loans receivable, related parties [Roll Forward]        
Balance at beginning of year 20,661 22,344    
New loans 5,720 2,600    
Payments (8,895) (4,283)    
Balance at end of year 17,486 20,661    
Business Lending [Member]        
Loans receivable, net [Abstract]        
Gross loans, including deferred origination costs $ 2,775,876 2,396,977    
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 $ 2,430,902 2,235,408    
Allowance for loan losses (10,269) (10,124) (10,465) (10,094)
Commercial Portfolio Segment [Member] | Business Lending [Member]        
Loans receivable, net [Abstract]        
Gross loans, including deferred origination costs 2,775,876 2,396,977    
Allowance for loan losses (19,426) (18,522) (17,257) (17,220)
Consumer Portfolio Segment [Member] | Consumer Indirect [Member]        
Loans receivable, net [Abstract]        
Gross loans, including deferred origination costs 1,113,062 1,083,207    
Allowance for loan losses (13,712) (14,366) (13,468) (13,782)
Consumer Portfolio Segment [Member] | Consumer Direct [Member]        
Loans receivable, net [Abstract]        
Gross loans, including deferred origination costs 184,378 178,820    
Allowance for loan losses (3,255) (3,095) (3,039) (2,979)
Consumer Portfolio Segment [Member] | Home Equity [Member]        
Loans receivable, net [Abstract]        
Gross loans, including deferred origination costs 386,325 386,709    
Allowance for loan losses $ (2,129) $ (2,144) $ (2,107) $ (2,399)