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LOANS, Loan Summary (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Loans receivable, net [Abstract]        
Gross loans, including deferred origination costs $ 4,932,213 $ 4,948,562    
Allowance for loan losses (47,096) (47,233) $ (45,596) $ (45,401)
Net loans 4,885,117 4,901,329    
Credit impaired acquired loans, total balance due 6,500 6,600    
Accretable discount related to credit impaired acquired loans [Roll forward]        
Beginning Balance 498      
Accretion recognized, year-to-date (72)      
Net reclassification to accretable from non-accretable 100      
Ending Balance $ 526      
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      
Business Lending [Member]        
Loans receivable, net [Abstract]        
Gross loans, including deferred origination costs $ 1,468,465 1,490,076    
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 $ 1,830,800 1,819,701    
Allowance for loan losses (10,149) (10,094) (10,148) (10,198)
Commercial Portfolio Segment [Member] | Business Lending [Member]        
Loans receivable, net [Abstract]        
Gross loans, including deferred origination costs 1,468,465 1,490,076    
Allowance for loan losses (16,857) (17,220) (16,695) (15,749)
Consumer Portfolio Segment [Member] | Consumer Indirect [Member]        
Loans receivable, net [Abstract]        
Gross loans, including deferred origination costs 1,055,112 1,044,972    
Allowance for loan losses (13,996) (13,782) (12,334) (12,422)
Consumer Portfolio Segment [Member] | Consumer Direct [Member]        
Loans receivable, net [Abstract]        
Gross loans, including deferred origination costs 184,067 191,815    
Allowance for loan losses (2,852) (2,979) (2,875) (2,997)
Consumer Portfolio Segment [Member] | Home Equity [Member]        
Loans receivable, net [Abstract]        
Gross loans, including deferred origination costs 393,769 401,998    
Allowance for loan losses $ (2,359) $ (2,399) $ (2,580) $ (2,666)