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Repurchase Reserve Liability (Detail Textuals)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Loan
Dec. 31, 2016
USD ($)
Loan
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Repurchase Reserve Liability [Abstract]        
Repurchase reserve liability $ 160 $ 160 $ 160 $ 160
Loss on repurchase   $ 2 $ 40  
Number of loans sold to the secondary market | Loan 2,773 2,877    
Balance of loans sold to the secondary market $ 285,800 $ 294,400