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LOANS, Loan Summary (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Loans receivable, net [Abstract]        
Gross loans, including deferred origination costs $ 6,256,757 $ 4,948,562    
Allowance for loan losses (47,583) (47,233) $ (45,401) $ (45,341)
Net loans 6,209,174 4,901,329    
Net deferred loan origination costs 25,300 22,800    
Loans receivable, related parties [Roll Forward]        
Balance at beginning of year 10,950 11,337    
New loans 16,617 4,959    
Payments (5,223) (5,346)    
Balance at end of year $ 22,344 10,950    
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 $ 2,424,223 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 $ 2,220,298 1,819,701    
Allowance for loan losses (10,465) (10,094) (10,198) (10,286)
Commercial Portfolio Segment [Member] | Business Lending [Member]        
Loans receivable, net [Abstract]        
Gross loans, including deferred origination costs 2,424,223 1,490,076    
Allowance for loan losses (17,257) (17,220) (15,749) (15,787)
Consumer Portfolio Segment [Member] | Consumer Indirect [Member]        
Loans receivable, net [Abstract]        
Gross loans, including deferred origination costs 1,011,978 1,044,972    
Allowance for loan losses (13,468) (13,782) (12,422) (11,544)
Consumer Portfolio Segment [Member] | Consumer Direct [Member]        
Loans receivable, net [Abstract]        
Gross loans, including deferred origination costs 179,929 191,815    
Allowance for loan losses (3,039) (2,979) (2,997) (3,083)
Consumer Portfolio Segment [Member] | Home Equity [Member]        
Loans receivable, net [Abstract]        
Gross loans, including deferred origination costs 420,329 401,998    
Allowance for loan losses $ (2,107) $ (2,399) $ (2,666) $ (2,701)