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LOANS, Loan Summary (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Loans receivable, net [Abstract]      
Gross loans, including deferred origination costs $ 4,948,562 $ 4,801,375  
Allowance for loan losses (47,233) (45,401) $ (45,341)
Net loans 4,901,329 4,755,974  
Net deferred loan origination costs 22,800 20,000  
Loans receivable, related parties [Roll Forward]      
Balance at beginning of year 11,337 8,928  
New loans 4,959 5,138  
Payments (5,346) (2,729)  
Balance at end of year $ 10,950 11,337  
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 $ 1,490,076 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 $ 1,819,701 1,769,754  
Allowance for loan losses (10,094) (10,198) (10,286)
Commercial Portfolio Segment [Member] | Business Lending [Member]      
Loans receivable, net [Abstract]      
Gross loans, including deferred origination costs 1,490,076 1,497,271  
Allowance for loan losses (17,220) (15,749) (15,787)
Consumer Portfolio Segment [Member] | Consumer Indirect [Member]      
Loans receivable, net [Abstract]      
Gross loans, including deferred origination costs 1,044,972 935,760  
Allowance for loan losses (2,979) (2,997) (3,083)
Consumer Portfolio Segment [Member] | Consumer Direct [Member]      
Loans receivable, net [Abstract]      
Gross loans, including deferred origination costs 191,815 195,076  
Allowance for loan losses (13,782) (12,422) (11,544)
Consumer Portfolio Segment [Member] | Home Equity [Member]      
Loans receivable, net [Abstract]      
Gross loans, including deferred origination costs 401,998 403,514  
Allowance for loan losses $ (2,399) $ (2,666) $ (2,701)