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Investment Securities and Equity Securities with Readily Determinable Fair Values (Unrealized and realized gains and losses recognized in net income on equity securities ) (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Investment Securities and Equity Securities with Readily Determinable Fair Values      
Equity Securities $ 6,125,000   $ 6,202,000
Summary of unrealized and realized gains and losses recognized in net income on equity securities      
Net gains (losses) recognized during the period on equity securities (77,000) $ 30,000  
Unrealized gain on equity securities with readily determinable fair values $ (77,000) $ 30,000