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LOANS, Loan Summary (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Loans receivable, net [Abstract]        
Gross loans, including deferred origination costs $ 6,227,030 $ 6,256,757    
Allowance for loan losses (48,103) (47,583) $ (47,096) $ (47,233)
Net loans 6,178,927 6,209,174    
Credit impaired acquired loans, total balance due 11,100 13,400    
Accretable discount related to credit impaired acquired loans [Roll forward]        
Beginning Balance 976      
Accretion recognized, year-to-date (278)      
Net reclassification between accretable and non-accretable 300      
Ending Balance 998      
Business Lending [Member]        
Loans receivable, net [Abstract]        
Gross loans, including deferred origination costs $ 2,426,086 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      
Commercial Portfolio Segment [Member] | Business Lending [Member]        
Loans receivable, net [Abstract]        
Gross loans, including deferred origination costs $ 2,426,086 2,424,223    
Commercial Portfolio Segment [Member] | Consumer Mortgage [Member]        
Loans receivable, net [Abstract]        
Allowance for loan losses (10,382) (10,465) (10,149) (10,094)
Residential Portfolio Segment [Member] | Business Lending [Member]        
Loans receivable, net [Abstract]        
Allowance for loan losses (17,607) (17,257) (16,857) (17,220)
Residential Portfolio Segment [Member] | Consumer Mortgage [Member]        
Loans receivable, net [Abstract]        
Gross loans, including deferred origination costs 2,211,882 2,220,298    
Consumer Portfolio Segment [Member] | Consumer Indirect [Member]        
Loans receivable, net [Abstract]        
Gross loans, including deferred origination costs 1,008,198 1,011,978    
Allowance for loan losses (13,698) (13,468) (13,996) (13,782)
Consumer Portfolio Segment [Member] | Consumer Direct [Member]        
Loans receivable, net [Abstract]        
Gross loans, including deferred origination costs 173,032 179,929    
Allowance for loan losses (2,984) (3,039) (2,852) (2,979)
Consumer Portfolio Segment [Member] | Home Equity [Member]        
Loans receivable, net [Abstract]        
Gross loans, including deferred origination costs 407,832 420,329    
Allowance for loan losses $ (2,040) $ (2,107) $ (2,359) $ (2,399)