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Investment Securities - Amortized Cost and Estimated Fair Value of Restricted Equity Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract]      
Federal Home Loan Bank Stock $ 8,957 $ 7,945 $ 7,945
Federal Reserve Bank Stock 1,037 1,037 1,037
Restricted equity securities $ 9,994 $ 8,982 $ 8,982