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SHORT-TERM BORROWINGS AND LONG-TERM DEBT (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
LONG-TERM DEBT      
Long term borrowings $ 92,785   $ 92,785
Short-term borrowings 157,000   38,000
Investment securities pledged as collateral 959,000   900,500
Deferred accrued interest paid 3,239 $ 3,283  
Federal Home Loan Bank Borrowings      
LONG-TERM DEBT      
Line of Credit, maximum borrowing capacity 1,200,000    
Additional unused borrowings available 1,000,000    
Long term borrowings 0   0
Short-term borrowings 157,000   38,000
Investment securities pledged as collateral 700    
Commercial real estate and commercial loans pledged as collateral 1,600,000    
Federal Reserve discount window line of credit      
LONG-TERM DEBT      
Additional unused borrowings available 27,500   33,300
Commercial real estate and commercial loans pledged as collateral $ 54,300   $ 72,900