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SHORT-TERM BORROWINGS AND LONG-TERM DEBT (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
LONG-TERM DEBT    
Short-term borrowings $ 0 $ 135,000,000
Long term borrowings 92,785,000 92,785,000
Investment securities pledged as collateral 1,110,000,000 1,050,000,000
Federal Home Loan Bank Borrowings    
LONG-TERM DEBT    
Line of Credit, maximum borrowing capacity 1,488,971,473 1,412,190,268
Unused borrowings available 1,490,000,000 1,280,000,000
Short-term borrowings 0 135,000,000
Long term borrowings 0 0
Commercial real estate and commercial loans pledged as collateral 1,940,000,000  
Federal Reserve discount window line of credit    
LONG-TERM DEBT    
Unused borrowings available 71,900,000 63,700,000
Commercial real estate and commercial loans pledged as collateral $ 127,500,000 $ 129,900,000