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Loans and Allowance for Loan Losses (Details 4) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Ending allowance balance attributable to loans:            
Individually evaluated for impairment     $ 625      
Collectively evaluated for impairment $ 4,152   3,953      
Total ending allowance balance 4,152 $ 4,095 4,578 $ 4,777 $ 4,830 $ 4,868
Loan Portfolio:            
Individually evaluated for impairment 9,899   10,245      
Collectively evaluated for impairment 472,015   477,245      
Total ending loans balance 481,914   487,490      
Commercial            
Ending allowance balance attributable to loans:            
Individually evaluated for impairment     625      
Collectively evaluated for impairment 1,271   966      
Total ending allowance balance 1,271 1,394 1,591 1,217 1,250 1,394
Loan Portfolio:            
Individually evaluated for impairment 5,433   5,581      
Collectively evaluated for impairment 67,545   107,760      
Total ending loans balance 72,978   113,341      
Commercial real estate            
Ending allowance balance attributable to loans:            
Collectively evaluated for impairment 2,601   2,702      
Total ending allowance balance 2,601 2,457 2,702 3,298 3,313 3,072
Loan Portfolio:            
Individually evaluated for impairment 4,466   4,664      
Collectively evaluated for impairment 305,553   278,471      
Total ending loans balance 310,019   283,135      
Residential real estate            
Ending allowance balance attributable to loans:            
Collectively evaluated for impairment 105   117      
Total ending allowance balance 105 80 117 106 113 163
Loan Portfolio:            
Collectively evaluated for impairment 69,870   62,071      
Total ending loans balance 69,870   62,071      
Consumer | Home equity            
Ending allowance balance attributable to loans:            
Collectively evaluated for impairment 66   70      
Total ending allowance balance 66 66 70 62 60 150
Loan Portfolio:            
Collectively evaluated for impairment 25,654   26,018      
Total ending loans balance 25,654   26,018      
Consumer | Other            
Ending allowance balance attributable to loans:            
Collectively evaluated for impairment 109   98      
Total ending allowance balance 109 $ 98 98 $ 94 $ 94 $ 89
Loan Portfolio:            
Collectively evaluated for impairment 3,393   2,925      
Total ending loans balance $ 3,393   $ 2,925