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Investment Securities (FHLB and FRB Stocks) (Details 7) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]    
Federal Home Loan Bank Stock $ 20,000 $ 20,000
Federal Reserve Bank Stock 20,645 20,063
Total $ 40,645 $ 40,063