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Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments (Unrealized and realized gains and losses recognized in net income on equity securities ) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments          
Equity Securities $ 6,136,000   $ 6,136,000   $ 6,202,000
Summary of unrealized and realized gains and losses recognized in net income on equity securities          
Net gains recognized during the period on equity securities 11,000 $ 69,000 (65,000) $ 99,000  
Unrealized gain on equity securities with readily determinable fair values $ 11,000 $ 69,000 $ (65,000) $ 99,000