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(FHLB and FRB Stocks) (Details 7) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]    
Federal Home Loan Bank Stock $ 19,000 $ 20,000
Federal Reserve Bank Stock 20,745 20,645
Total $ 39,745 $ 40,645