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SHORT-TERM BORROWINGS AND LONG-TERM DEBT (Details) (USD $)
 3 Months Ended 9 Months Ended 1 Months Ended 1 Months Ended 3 Months Ended
Mar. 31, 2013
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Jun. 30, 2013
Trust I
Sep. 30, 2013
Trust I
Oct. 31, 2013
Trust I
Subsequent event
Sep. 30, 2013
Federal Reserve discount window line of credit
Sep. 30, 2013
FHLB line of credit
Dec. 31, 2012
FHLB line of credit
Sep. 30, 2013
Junior subordinated debentures
Maximum
LONG-TERM DEBT                      
Maximum borrowing capacity               $ 47,300,000 $ 907,800,000    
Advances outstanding               0      
Commercial real estate and commercial loans pledged as collateral               81,500,000 1,300,000,000    
Short-term borrowings   28,000,000             28,000,000 0  
Long-term borrowings   108,268,000   108,281,000         18,500 32,000  
Investment securities pledged as collateral   901,300,000   905,500,000         64,800,000    
Number of consecutive quarterly periods for which payments of interest can be deferred without default or penalty                     60 months
Deferred accrued interest paid 13,000,000 17,436,000 4,489,000                
Trust preferred securities auctioned off value         10,000,000            
Trust preferred securities issued         15,000,000            
Trust preferred securities bid value accepted amount         9,000,000            
Investment in unconsolidated subsidiaries   18,558,000   10,975,000   9,000,000          
Payments for repurchase of remaining trust preferred securities             5,000,000        
Payments for repurchase of remaining common stock             $ 500,000