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LOANS, Loan Summary (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Loans receivable, net [Abstract]              
Gross loans $ 4,313,547 $ 4,313,547   $ 4,236,206      
Allowance for loan losses (45,588) (45,588) $ (45,282) (45,341) $ (45,273) $ (44,615) $ (44,319)
Net loans 4,267,959 4,267,959   4,190,865      
Credit impaired acquired loans, outstanding balance 5,200 5,200   6,100      
Accretable discount related to credit impaired acquired loans [Roll forward]              
Beginning Balance   705          
Accretion recognized, year-to-date   (437)          
Net reclassification to accretable from non-accretable   329          
Ending Balance $ 597 597          
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 $ 1,288,772 1,288,772   1,262,484      
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 $ 1,621,862 1,621,862   1,613,384      
Allowance for loan losses (10,346) (10,346) (10,192) (10,286) (9,454) (9,375) (8,994)
Commercial Portfolio Segment [Member] | Business Lending [Member]              
Loans receivable, net [Abstract]              
Gross loans 1,288,772 1,288,772   1,262,484      
Allowance for loan losses (15,338) (15,338) (15,353) (15,787) (16,591) (16,553) (17,507)
Consumer Portfolio Segment [Member] | Consumer Indirect [Member]              
Loans receivable, net [Abstract]              
Gross loans 872,988 872,988   833,968      
Allowance for loan losses (12,112) (12,112) (11,602) (11,544) (11,899) (11,354) (10,248)
Consumer Portfolio Segment [Member] | Consumer Direct [Member]              
Loans receivable, net [Abstract]              
Gross loans 184,479 184,479   184,028      
Allowance for loan losses (3,097) (3,097) (2,991) (3,083) (3,330) (3,298) (3,181)
Consumer Portfolio Segment [Member] | Home Equity [Member]              
Loans receivable, net [Abstract]              
Gross loans 345,446 345,446   342,342      
Allowance for loan losses $ (2,742) $ (2,742) $ (2,677) $ (2,701) $ (1,901) $ (1,860) $ (1,830)