v2.4.0.8
LOANS, Loan Summary (Details) (USD $)
 9 Months Ended
Sep. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Loans receivable, net [Abstract]            
Typical contract term of consumer mortgages, minimum 15 years          
Typical contract term of consumer mortgages, maximum 30 years          
Typical contract term of home equity loans, maximum 15 years          
Gross loans, including deferred origination costs $ 4,025,455,000   $ 3,865,576,000      
Allowance for loan losses (44,083,000) (43,473,000) (42,888,000) (42,817,000) (41,828,000) (42,213,000)
Net loans 3,981,372,000   3,822,688,000      
Credit impaired acquired loans, outstanding balance 17,600,000   22,400,000      
Accretable discount related to credit impaired acquired loans [Roll forward]            
Beginning Balance 1,770,000          
Accretion recognized, year-to-date (846,000)          
Net reclassification to accretable from nonaccretable 73,000          
Ending Balance 997,000          
Consumer Mortgage [Member]
            
Loans receivable, net [Abstract]            
Gross loans, including deferred origination costs 1,570,607,000   1,448,415,000      
Business Lending [Member]
            
Loans receivable, net [Abstract]            
Gross loans, including deferred origination costs 1,214,796,000   1,233,944,000      
Consumer Indirect [Member]
            
Loans receivable, net [Abstract]            
Gross loans, including deferred origination costs 713,310,000   647,518,000      
Consumer Direct [Member]
            
Loans receivable, net [Abstract]            
Gross loans, including deferred origination costs 178,496,000   171,474,000      
Home Equity [Member]
            
Loans receivable, net [Abstract]            
Gross loans, including deferred origination costs $ 348,246,000   $ 364,225,000