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Investment Securities Cost-Method Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Investments, All Other Investments [Abstract]    
Federal Reserve Bank Stock $ 1,071 $ 1,060
Federal Home Loan Bank Stock 9,841 7,779
Total Federal Reserve Bank and Federal Home Loan Bank Stock $ 10,912 $ 8,839