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Securities (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2017
Dec. 31, 2016
Securities (Textual)      
Fair value of securities pledged as collateral   $ 58,300 $ 44,300
Securities delivered for repurchase agreements   13,900 14,600
Gross gains realized from sales of available-for-sale securities $ 200    
Tax expense for net security gains   70  
Total fair value of investments   $ 53,818 $ 52,186
Fair value as a percentage of available-for-sale investment portfolio   52.00% 58.00%
Unrealized loss on the securities portfolio   $ 440 $ 730