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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 ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Investment Securities and Equity Securities with Readily Determinable Fair Values          
Equity Securities $ 6,182   $ 6,182   $ 6,095
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 (12) $ 45 87 $ 235  
Unrealized gain on equity securities with readily determinable fair values $ (12) $ 45 $ 87 $ 235