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Troubled Debt Restructurings (Details Textual)
$ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
Investment
Dec. 31, 2016
USD ($)
Investment
Troubled Debt Restructurings (Textual)    
Total number of loans classified under troubled debt restructurings (TDRs) 21 17
Total sum of loans classified as troubled debt restructurings (TDRs) | $ $ 7.8 $ 6.7
Number of months previous loan payment defaulted 12 months 12 months
Commercial [Member]    
Troubled Debt Restructurings (Textual)    
Total number of loans added under troubled debt restructurings (TDRs) 5  
Total sum of loans added as troubled debt restructurings (TDRs) | $ $ 2.6  
Total number of loans removed under TDR 4  
Total number of nonaccrual loans restored 4  
Consumer [Member]    
Troubled Debt Restructurings (Textual)    
Total number of loans added under troubled debt restructurings (TDRs) 3  
Total sum of loans added as troubled debt restructurings (TDRs) | $ $ 2.6  
Total number of loans removed under TDR 4  
Total number of nonaccrual loans restored 4