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Interest Bearing Deposits (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Interest Bearing Deposits (Textual)    
Interest-bearing time deposits in denominations of $250,000 or more $ 27,900 $ 11,100
Certificates of deposit obtained from brokers $ 10,700 12,700
Deposits maturity date Between 2018 and 2022.  
Time deposits certificate of deposit account registry service $ 55,400 $ 61,600
Cash FDIC insured 250  
Cash CDARS program insured 250  
State bank Program $ 250