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LOANS, Loan Summary (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Loans receivable, net [Abstract]        
Gross loans, including deferred origination costs $ 4,821,172 $ 4,801,375    
Allowance for loan losses (45,596) (45,401) $ (45,005) $ (45,341)
Net loans 4,775,576 4,755,974    
Credit impaired acquired loans, outstanding balance 8,300 8,500    
Accretable discount related to credit impaired acquired loans [Roll forward]        
Beginning Balance 810      
Accretion recognized, year-to-date (140)      
Net reclassification to accretable from non-accretable 43      
Ending Balance $ 713      
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 $ 1,509,421 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 $ 1,777,792 1,769,754    
Allowance for loan losses (10,148) (10,198) (10,233) (10,286)
Commercial Portfolio Segment [Member] | Business Lending [Member]        
Loans receivable, net [Abstract]        
Gross loans, including deferred origination costs 1,509,421 1,497,271    
Allowance for loan losses (16,695) (15,749) (15,405) (15,787)
Consumer Portfolio Segment [Member] | Consumer Indirect [Member]        
Loans receivable, net [Abstract]        
Gross loans, including deferred origination costs 941,151 935,760    
Allowance for loan losses (12,334) (12,422) (11,246) (11,544)
Consumer Portfolio Segment [Member] | Consumer Direct [Member]        
Loans receivable, net [Abstract]        
Gross loans, including deferred origination costs 189,535 195,076    
Allowance for loan losses (2,875) (2,997) (2,879) (3,083)
Consumer Portfolio Segment [Member] | Home Equity [Member]        
Loans receivable, net [Abstract]        
Gross loans, including deferred origination costs 403,273 403,514    
Allowance for loan losses $ (2,580) $ (2,666) $ (2,663) $ (2,701)