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DERIVATIVE FINANCIAL INSTRUMENTS - (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Asset pledged    
Derivative Financial Instruments    
Available-for-sale securities pledged as collateral $ 7,027,000  
Interest rate swap agreements    
Derivative Financial Instruments    
Aggregate notional amount 123,094,000 $ 135,740,000
Asset Derivatives, Notional Amount 61,547,000 67,870,000
Asset Derivatives, Fair Value 3,104,000 6,566,000
Liability Derivatives, Notional Amount 61,547,000 67,870,000
Liability Derivatives, Fair Value 3,104,000 6,566,000
Derivatives not designated as hedging instruments | Interest rate swap agreements    
Derivative Financial Instruments    
Interest rate swap 0 0
Increase (decrease) in interest income $ 1,347,000 $ 698,000