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Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions - Effect of Fair Value (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions    
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income $ 3,100,000 $ 1,200,000
Amount of Gain or (Loss) Recognized in Income on Derivative $ 50,000 $ 168,000