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LOANS, Loan Summary (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Loans receivable, net [Abstract]            
Gross loans, including deferred origination costs $ 6,300,888   $ 6,256,757      
Allowance for loan losses (50,133) $ (49,618) (47,583) $ (47,983) $ (47,451) $ (47,233)
Net loans 6,250,755   6,209,174      
Credit impaired acquired loans, total balance due 7,800   13,400      
Accretable discount related to credit impaired acquired loans [Roll forward]            
Beginning Balance 976          
Accretion recognized, year-to-date (722)          
Net reclassification between accretable and non-accretable 239          
Ending Balance 493          
Business Lending [Member]            
Loans receivable, net [Abstract]            
Gross loans, including deferred origination costs $ 2,403,624   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 $ 2,403,624   2,424,223      
Commercial Portfolio Segment [Member] | Consumer Mortgage [Member]            
Loans receivable, net [Abstract]            
Allowance for loan losses (10,170) (10,473) (10,465) (10,303) (10,197) (10,094)
Residential Portfolio Segment [Member] | Business Lending [Member]            
Loans receivable, net [Abstract]            
Allowance for loan losses (18,780) (18,439) (17,257) (17,632) (17,230) (17,220)
Residential Portfolio Segment [Member] | Consumer Mortgage [Member]            
Loans receivable, net [Abstract]            
Gross loans, including deferred origination costs 2,220,022   2,220,298      
Consumer Portfolio Segment [Member] | Consumer Indirect [Member]            
Loans receivable, net [Abstract]            
Gross loans, including deferred origination costs 1,098,943   1,011,978      
Allowance for loan losses (14,969) (14,424) (13,468) (13,778) (13,918) (13,782)
Consumer Portfolio Segment [Member] | Consumer Direct [Member]            
Loans receivable, net [Abstract]            
Gross loans, including deferred origination costs 184,349   179,929      
Allowance for loan losses (3,221) (3,164) (3,039) (3,018) (2,945) (2,979)
Consumer Portfolio Segment [Member] | Home Equity [Member]            
Loans receivable, net [Abstract]            
Gross loans, including deferred origination costs 393,950   420,329      
Allowance for loan losses $ (2,034) $ (2,015) $ (2,107) $ (2,202) $ (2,242) $ (2,399)