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Investment Securities - Amortized Cost and Estimated Fair Value of Restricted Equity Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]      
Federal Home Loan Bank Stock $ 10,549 $ 9,321 $ 9,761
Federal Reserve Bank Stock 1,037 1,037 1,037
Restricted equity securities $ 11,586 $ 10,358 $ 10,798