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SHORT-TERM BORROWINGS AND LONG-TERM DEBT (Details) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
LONG-TERM DEBT    
Short-term borrowings $ 150,000,000 $ 69,000,000
Long term borrowings 92,785,000 92,785,000
Investment securities pledged as collateral 1,100,000,000 1,000,000,000
Federal Home Loan Bank Borrowings    
LONG-TERM DEBT    
Line of Credit, maximum borrowing capacity 1,389,618,533.000000000  
Unused borrowings available 1,240,000,000  
Short-term borrowings 150,000,000 69,000,000
Long term borrowings 0 0
Investment securities pledged as collateral 300,000  
Commercial real estate and commercial loans pledged as collateral 1,810,000,000  
Federal Reserve discount window line of credit    
LONG-TERM DEBT    
Unused borrowings available 68,400,000 40,800,000
Commercial real estate and commercial loans pledged as collateral $ 129,500,000 $ 87,300,000