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Securities (Details Textual) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Securities (Textual)      
Fair value of securities pledged as collateral $ 44,700   $ 44,300
Securities delivered for repurchase agreements 14,900   14,600
Gross gains realized from sales of available-for-sale securities 120 $ 260  
Tax expense for net security gains 40 $ 90  
Total fair value of investments $ 42,494   $ 52,186
Fair value as a percentage of available-for-sale investment portfolio 50.00%   58.00%
Unrealized loss on the securities portfolio $ 370   $ 730