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SHORT-TERM BORROWINGS AND LONG-TERM DEBT (Details) (USD $)
 9 Months Ended 1 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2012
Federal Reserve discount window line of credit
Sep. 30, 2012
FHLB line of credit
Dec. 31, 2011
FHLB line of credit
Sep. 30, 2012
Junior subordinated debentures
Dec. 31, 2011
Junior subordinated debentures
Aug. 31, 2009
Junior subordinated debentures
Maximum
SHORT-TERM BORROWINGS AND LONG-TERM DEBT                
Maximum borrowing capacity     $ 25,400,000 $ 869,100,000        
Long-term borrowings 108,285,000 158,298,000   36,000 50,000,000      
Commercial and real estate loans pledged as collateral     43,800,000 1,100,000,000        
Investment securities pledged as collateral 869,600,000 938,000,000   144,900,000        
Drawn borrowing capacity       36,000        
Number of consecutive quarterly periods for which payments of interest can be deferred without default or penalty               5 years
Current deferral period           3 years 3 months    
Accrued interest           $ 11,200,000 $ 8,500,000