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DERIVATIVE FINANCIAL INSTRUMENTS - (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Asset pledged        
Derivative Financial Instruments        
Available-for-sale securities pledged as collateral $ 9,109,000 $ 9,109,000    
Interest rate swap agreements        
Derivative Financial Instruments        
Aggregate notional amount 126,716,000 126,716,000 $ 135,740,000  
Asset Derivatives, Notional Amount 63,358,000 63,358,000 67,870,000  
Asset Derivatives, Fair Value 4,468,000 4,468,000 6,566,000  
Liability Derivatives, Notional Amount 63,358,000 63,358,000 67,870,000  
Liability Derivatives, Fair Value 4,468,000 4,468,000 $ 6,566,000  
Derivatives not designated as hedging instruments | Interest rate swap agreements        
Derivative Financial Instruments        
Interest rate swap 0 0   $ 0
Increase (decrease) in interest income $ 340,000 $ 678,000