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SHORT-TERM BORROWINGS AND LONG-TERM DEBT (Details) (USD $)
 6 Months Ended 1 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
Federal Reserve discount window line of credit
Jun. 30, 2012
FHLB line of credit
Dec. 31, 2011
FHLB line of credit
Jun. 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     $ 29,600,000 $ 808,400,000        
Long-term borrowings 108,289,000 158,298,000   40,000 50,000,000      
Commercial and real estate loans pledged as collateral     49,300,000 986,800,000        
Investment securities pledged as collateral 871,200,000 938,000,000   169,200,000        
Drawn borrowing capacity       40,000        
Number of consecutive quarterly periods for which payments of interest can be deferred without default or penalty               5 years
Current deferral period           3 years    
Accrued interest           $ 10,300,000 $ 8,500,000