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Investment Securities Cost-Method Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Investments, All Other Investments [Abstract]    
Federal Reserve Bank Stock $ 1,132 $ 1,120
Federal Home Loan Bank Stock 14,374 8,829
Total Federal Reserve Bank and Federal Home Loan Bank Stock $ 15,506 $ 9,949