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Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk - Effect of Fair Value (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk    
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income $ 2,700,000 $ 2,300,000
Amount of Gain or (Loss) Recognized in Income on Derivative $ 57,000 $ 50,000