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DERIVATIVE FINANCIAL INSTRUMENTS - (Details) - USD ($)
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Asset pledged      
Derivative Financial Instruments      
Available-for-sale securities pledged as collateral $ 3,965,000    
Interest rate swap agreements      
Derivative Financial Instruments      
Aggregate notional amount 122,138,000   $ 123,904,000
Asset Derivatives, Notional Amount 61,069,000   61,547,000
Asset Derivatives, Fair Value 137,000   3,104,000
Liability Derivatives, Notional Amount 61,069,000   61,547,000
Liability Derivatives, Fair Value 137,000   $ 3,104,000
Derivatives not designated as hedging instruments | Interest rate swap agreements      
Derivative Financial Instruments      
Interest rate swap 0 $ 0  
Increase (decrease) in interest income $ 317,000 $ 338,000