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Loans and the Allowance for Loan Losses (Details Textual)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
loan
Dec. 31, 2016
USD ($)
loan
Loans and the Allowance for Loan Losses [Line Items]    
Unearned income $ 3,100 $ 2,400
Loans pledged to secure borrowings at FHLB 492,200 266,600
Allowance for loan losses $ 15,805 $ 16,008
Allowance for loan losses, percentage 0.80% 1.53%
Number of loans modified | loan 5 6
Modifications, period of reduced payments   2 years
One Loan [Member]    
Loans and the Allowance for Loan Losses [Line Items]    
Modifications, recorded investment $ 91 $ 2,000
Commercial Loan [Member]    
Loans and the Allowance for Loan Losses [Line Items]    
Number of loans modified | loan 1  
Construction Loans [Member]    
Loans and the Allowance for Loan Losses [Line Items]    
Number of loans modified | loan   2