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Investment Securities (Details Textual)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Investment
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Investment
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Investment
Investment Securities (Textual)          
Sale of investment securities     $ 415 $ 19,800  
Gain on sale of investment securities $ 2 $ 19 2 $ 325  
Fair market value, less than 12 months 58,800   58,800    
Fair market value, 12 months or longer 5,800   5,800    
Securities pledged as collateral for repurchase agreements from brokers         $ 21,000
Securities pledged to secure client deposit $ 20,500   $ 20,500   $ 21,100
Number of investments, less than 12 months | Investment 57   57   63
Number of investments, 12 months or longer | Investment 4   4   2