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Loans (Details 4) - USD ($)
$ in Thousands
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Ending allowance balance attributable to loans:            
Individually evaluated for impairment $ 77   $ 249      
Collectively evaluated for impairment 11,942   10,603      
Acquired loans collectively evaluated for impairment 85   0      
Total ending allowance balance 12,104 $ 11,746 10,852 $ 10,518 $ 9,720 $ 8,978
Loans:            
Loans individually evaluated for impairment 4,792   7,338      
Loans collectively evaluated for impairment 1,212,213   1,048,074      
Acquired loans 332,621   370,359      
Acquired with deteriorated credit quality 873,040   779,340      
Loans 1,551,437   1,427,635      
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 1,811   1,864      
Commercial real estate            
Ending allowance balance attributable to loans:            
Individually evaluated for impairment 3   86      
Collectively evaluated for impairment 4,179   3,491      
Acquired loans collectively evaluated for impairment 37   0      
Total ending allowance balance 4,219 3,954 3,577 3,341 3,210 3,127
Loans:            
Loans individually evaluated for impairment 853   3,457      
Loans collectively evaluated for impairment 466,325   376,632      
Acquired loans 140,558   153,228      
Loans 608,755   534,285      
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 1,019   968      
Commercial            
Ending allowance balance attributable to loans:            
Individually evaluated for impairment 4   111      
Collectively evaluated for impairment 1,999   1,763      
Acquired loans collectively evaluated for impairment 12   0      
Total ending allowance balance 2,015 1,936 1,874 1,822 1,634 1,373
Loans:            
Loans individually evaluated for impairment 250   477      
Loans collectively evaluated for impairment 218,907   195,146      
Acquired loans 44,337   48,536      
Loans 264,286   245,055      
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 792   896      
Residential real estate            
Ending allowance balance attributable to loans:            
Individually evaluated for impairment 70   52      
Collectively evaluated for impairment 2,230   2,153      
Acquired loans collectively evaluated for impairment 33   0      
Total ending allowance balance 2,333 2,310 2,205 2,147 2,081 1,845
Loans:            
Loans individually evaluated for impairment 3,591   3,308      
Loans collectively evaluated for impairment 324,201   280,215      
Acquired loans 131,385   146,672      
Loans 459,177   430,195      
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 2,904   2,766      
Acquired loans collectively evaluated for impairment 3   0      
Total ending allowance balance 2,907 2,927 2,766 2,601 2,444 2,160
Loans:            
Loans individually evaluated for impairment 98   96      
Loans collectively evaluated for impairment 202,780   196,081      
Acquired loans 16,341   21,923      
Loans 219,219   218,100      
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 630   430      
Acquired loans collectively evaluated for impairment 0   0      
Total ending allowance balance 630 $ 619 430 $ 607 $ 351 $ 473
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