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Loans (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 $ 318   $ 162      
Collectively evaluated for impairment 12,938   12,048      
Acquired loans collectively evaluated for impairment 121   105      
Total ending allowance balance 13,377 $ 12,764 12,315 $ 12,104 $ 11,746 $ 10,852
Loans:            
Loans individually evaluated for impairment 6,554   5,536      
Loans collectively evaluated for impairment 1,417,801   1,259,993      
Acquired loans 266,279   310,118      
Acquired with deteriorated credit quality 975,866   895,561      
Loans 1,691,532   1,577,381      
Receivables Acquired with Deteriorated Credit Quality            
Ending allowance balance attributable to loans:            
Acquired with deteriorated credit quality 0   0      
Loans:            
Acquired with deteriorated credit quality 898   1,734      
Commercial real estate            
Ending allowance balance attributable to loans:            
Individually evaluated for impairment 6   0      
Collectively evaluated for impairment 4,676   4,214      
Acquired loans collectively evaluated for impairment 58   46      
Total ending allowance balance 4,740 4,339 4,260 4,219 3,954 3,577
Loans:            
Loans individually evaluated for impairment 804   658      
Loans collectively evaluated for impairment 579,225   497,168      
Acquired loans 117,907   131,926      
Loans 698,172   630,700      
Commercial real estate | Receivables Acquired with Deteriorated Credit Quality            
Ending allowance balance attributable to loans:            
Acquired with deteriorated credit quality 0   0      
Loans:            
Acquired with deteriorated credit quality 236   948      
Commercial            
Ending allowance balance attributable to loans:            
Individually evaluated for impairment 4   4      
Collectively evaluated for impairment 1,987   1,993      
Acquired loans collectively evaluated for impairment 16   14      
Total ending allowance balance 2,007 1,937 2,011 2,015 1,936 1,874
Loans:            
Loans individually evaluated for impairment 147   260      
Loans collectively evaluated for impairment 247,094   225,312      
Acquired loans 29,791   38,503      
Loans 277,694   264,861      
Commercial | Receivables Acquired with Deteriorated Credit Quality            
Ending allowance balance attributable to loans:            
Acquired with deteriorated credit quality 0   0      
Loans:            
Acquired with deteriorated credit quality 662   786      
Residential real estate            
Ending allowance balance attributable to loans:            
Individually evaluated for impairment 308   158      
Collectively evaluated for impairment 2,469   2,322      
Acquired loans collectively evaluated for impairment 43   41      
Total ending allowance balance 2,820 2,651 2,521 2,333 2,310 2,205
Loans:            
Loans individually evaluated for impairment 5,539   4,559      
Loans collectively evaluated for impairment 375,708   339,143      
Acquired loans 107,903   125,182      
Loans 489,150   468,884      
Residential real estate | Receivables Acquired with Deteriorated Credit Quality            
Ending allowance balance attributable to loans:            
Acquired with deteriorated credit quality 0   0      
Loans:            
Acquired with deteriorated credit quality 0   0      
Consumer            
Ending allowance balance attributable to loans:            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 3,031   2,844      
Acquired loans collectively evaluated for impairment 4   4      
Total ending allowance balance 3,035 3,050 2,848 2,907 2,927 2,766
Loans:            
Loans individually evaluated for impairment 64   59      
Loans collectively evaluated for impairment 215,774   198,370      
Acquired loans 10,678   14,507      
Loans 226,516   212,936      
Consumer | Receivables Acquired with Deteriorated Credit Quality            
Ending allowance balance attributable to loans:            
Acquired with deteriorated credit quality 0   0      
Loans:            
Acquired with deteriorated credit quality 0   0      
Unallocated            
Ending allowance balance attributable to loans:            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 775   675      
Acquired loans collectively evaluated for impairment 0   0      
Total ending allowance balance 775 $ 787 675 $ 630 $ 619 $ 430
Loans:            
Loans individually evaluated for impairment 0   0      
Loans collectively evaluated for impairment 0   0      
Acquired loans 0   0      
Loans 0   0      
Unallocated | Receivables Acquired with Deteriorated Credit Quality            
Ending allowance balance attributable to loans:            
Acquired with deteriorated credit quality 0   0      
Loans:            
Acquired with deteriorated credit quality $ 0   $ 0