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Available-for-Sale Securities (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Available-for-Sale Securities (Textual)    
Fair value of securities pledged as collateral $ 44,300 $ 46,200
Securities delivered for repurchase agreements 14,600 15,800
Gross gains realized from sales of available-for-sale securities 260
Gross losses realized from sales of available-for-sale securities  
Net gain on sales of securities 262
Total fair value of investments 52,186 $ 37,200
Unrealized loss on the securities portfolio 300  
Tax expense for net security gains $ 90  
Fair value as a percentage of available-for-sale investment portfolio 58.00% 41.00%