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DERIVATIVE FINANCIAL INSTRUMENTS (Back-to-back loan swaps narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Derivative [Line Items]          
Cash pledged as collateral $ 2,900,000   $ 2,900,000   $ 3,800,000
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 30,600,000   30,600,000   46,500,000
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