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LOANS, Loan Summary (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Loans receivable, net [Abstract]            
Gross loans, including deferred origination costs $ 6,308,720   $ 4,948,562      
Allowance for loan losses (47,983) $ (47,451) (47,233) $ (46,789) $ (46,526) $ (45,401)
Net loans 6,260,737   4,901,329      
Credit impaired acquired loans, total balance due 21,000   6,600      
Accretable discount related to credit impaired acquired loans [Roll forward]            
Beginning Balance 498          
Accretion recognized, year-to-date (451)          
Net reclassification to accretable from non-accretable 511          
Merchants acquisition 758          
Ending Balance $ 1,316          
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 $ 2,458,981   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 $ 2,206,527   1,819,701      
Allowance for loan losses (10,303) (10,197) (10,094) (9,968) (9,853) (10,198)
Commercial Portfolio Segment [Member] | Business Lending [Member]            
Loans receivable, net [Abstract]            
Gross loans, including deferred origination costs 2,458,981   1,490,076      
Allowance for loan losses (17,632) (17,230) (17,220) (16,602) (16,949) (15,749)
Consumer Portfolio Segment [Member] | Consumer Indirect [Member]            
Loans receivable, net [Abstract]            
Gross loans, including deferred origination costs 1,034,716   1,044,972      
Allowance for loan losses (13,778) (13,918) (13,782) (13,573) (13,215) (12,422)
Consumer Portfolio Segment [Member] | Consumer Direct [Member]            
Loans receivable, net [Abstract]            
Gross loans, including deferred origination costs 183,898   191,815      
Allowance for loan losses (3,018) (2,945) (2,979) (3,041) (3,020) (2,997)
Consumer Portfolio Segment [Member] | Home Equity [Member]            
Loans receivable, net [Abstract]            
Gross loans, including deferred origination costs 424,598   401,998      
Allowance for loan losses $ (2,202) $ (2,242) $ (2,399) $ (2,531) $ (2,500) $ (2,666)