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Securities (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Securities (Textual)      
Fair value of securities pledged as collateral $ 51,300   $ 44,300
Securities delivered for repurchase agreements 16,800   14,600
Gross gains realized from sales of available-for-sale securities   $ 110  
Tax expense for net security gains 40    
Total fair value of investments $ 66,836   $ 52,186
Fair value as a percentage of available-for-sale investment portfolio 62.00%   58.00%
Unrealized loss on the securities portfolio $ 640   $ 730