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LOANS, Loan Summary (Details) (USD $)
 9 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Loans receivable, net [Abstract]            
Typical contract term of consumer mortgages, minimum 10 years          
Typical contract term of consumer mortgages, maximum 30 years          
Typical contract term of home equity loans, maximum 30 years          
Gross loans, including deferred origination costs $ 4,217,244,000   $ 4,109,083,000      
Allowance for loan losses (45,273,000) (44,615,000) (44,319,000) (44,083,000) (43,473,000) (42,888,000)
Net loans 4,171,971,000   4,064,764,000      
Credit impaired acquired loans, outstanding balance 7,000,000   13,100,000      
Accretable discount related to credit impaired acquired loans [Roll forward]            
Beginning Balance 997,000          
Accretion recognized, year-to-date (567,000)          
Net reclassification to accretable from nonaccretable 355,000          
Ending Balance 785,000          
Consumer Mortgage [Member]
            
Loans receivable, net [Abstract]            
Gross loans, including deferred origination costs 1,598,298,000   1,582,058,000      
Allowance for loan losses (9,454,000) (9,375,000) (8,994,000) (7,601,000) (7,373,000) (7,070,000)
Business Lending [Member]
            
Loans receivable, net [Abstract]            
Gross loans, including deferred origination costs 1,251,178,000   1,260,364,000      
Allowance for loan losses (16,591,000) (16,553,000) (17,507,000) (18,271,000) (18,283,000) (18,013,000)
Consumer Indirect [Member]
            
Loans receivable, net [Abstract]            
Gross loans, including deferred origination costs 841,975,000   740,002,000      
Allowance for loan losses (11,899,000) (11,354,000) (10,248,000) (10,068,000) (9,369,000) (9,606,000)
Consumer Direct [Member]
            
Loans receivable, net [Abstract]            
Gross loans, including deferred origination costs 186,672,000   180,139,000      
Allowance for loan losses (3,330,000) (3,298,000) (3,181,000) (3,165,000) (3,054,000) (3,303,000)
Home Equity [Member]
            
Loans receivable, net [Abstract]            
Gross loans, including deferred origination costs 339,121,000   346,520,000      
Allowance for loan losses $ (1,901,000) $ (1,860,000) $ (1,830,000) $ (1,714,000) $ (1,674,000) $ (1,451,000)