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Repurchase Reserve Liability (Detail Textuals)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
Loan
Dec. 31, 2017
USD ($)
Loan
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Repurchase Reserve Liability [Abstract]        
Repurchase reserve liability $ 160 $ 160 $ 160 $ 160
Number of loans sold to the secondary market | Loan 2,743 2,773    
Balance of loans sold to the secondary market $ 283,100 $ 285,800