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SHORT-TERM BORROWINGS AND LONG-TERM DEBT (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
LONG-TERM DEBT    
Short-term borrowings $ 56,000,000 $ 32,000,000
Long term borrowings 92,785,000 92,785,000
Federal Home Loan Bank Borrowings    
LONG-TERM DEBT    
Line of Credit, maximum borrowing capacity 1,590,150,827 1,502,811,674
Unused borrowings available 1,530,000,000 1,470,000,000
Short-term borrowings 56,000,000 32,000,000
Long term borrowings 0 0
Commercial real estate and commercial loans pledged as collateral 2,140,000,000  
Federal Reserve discount window line of credit    
LONG-TERM DEBT    
Unused borrowings available 72,300,000 73,000,000
Commercial real estate and commercial loans pledged as collateral $ 127,100,000 $ 129,200,000