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LOANS, Loan Summary (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Loans receivable, net [Abstract]            
Gross loans, including deferred origination costs $ 4,940,621   $ 4,801,375      
Allowance for loan losses (46,789) $ (46,526) (45,401) $ (45,588) $ (45,282) $ (45,341)
Net loans 4,893,832   4,755,974      
Credit impaired acquired loans, outstanding balance 8,000   8,500      
Accretable discount related to credit impaired acquired loans [Roll forward]            
Beginning Balance 810          
Accretion recognized, year-to-date (359)          
Net reclassification to accretable from non-accretable 129          
Ending Balance $ 580          
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 $ 1,506,878   1,497,271      
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 $ 1,798,748   1,769,754      
Allowance for loan losses (9,968) (9,853) (10,198) (10,346) (10,192) (10,286)
Commercial Portfolio Segment [Member] | Business Lending [Member]            
Loans receivable, net [Abstract]            
Gross loans, including deferred origination costs 1,506,878   1,497,271      
Allowance for loan losses (16,602) (16,949) (15,749) (15,338) (15,353) (15,787)
Consumer Portfolio Segment [Member] | Consumer Indirect [Member]            
Loans receivable, net [Abstract]            
Gross loans, including deferred origination costs 1,037,077   935,760      
Allowance for loan losses (13,573) (13,215) (12,422) (12,112) (11,602) (11,544)
Consumer Portfolio Segment [Member] | Consumer Direct [Member]            
Loans receivable, net [Abstract]            
Gross loans, including deferred origination costs 196,134   195,076      
Allowance for loan losses (3,041) (3,020) (2,997) (3,097) (2,991) (3,083)
Consumer Portfolio Segment [Member] | Home Equity [Member]            
Loans receivable, net [Abstract]            
Gross loans, including deferred origination costs 401,784   403,514      
Allowance for loan losses $ (2,531) $ (2,500) $ (2,666) $ (2,742) $ (2,677) $ (2,701)