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DERIVATIVE FINANCIAL INSTRUMENTS (Back-to-back loan swaps narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Derivative [Line Items]          
Cash pledged as collateral $ 4,200,000   $ 4,200,000   $ 1,900,000
Counterparties          
Derivative [Line Items]          
Cash pledged as collateral 0   0   0
Back-to-Back Loan Swaps | Interest Rate Swaps          
Derivative [Line Items]          
Cash pledged as collateral 53,200,000   53,200,000   20,200,000
Back-to-Back Loan Swaps | Interest Rate Swaps | Interest income          
Derivative [Line Items]          
Gain (loss) recognized 0 $ 0 0 $ 0  
Back-to-Back Loan Swaps | Interest Rate Swaps | Counterparties          
Derivative [Line Items]          
Cash pledged as collateral $ 0   $ 0   $ 0