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Loans and Allowance for Loan Losses (Details 10) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Allowance for loan losses and recorded investment in loans by impairment methodology            
Allowance for loan losses, Individually evaluated $ 2,935   $ 3,677      
Recorded investment in loans, Individually evaluated 12,665   12,446      
Allowance for loan losses, Collectively evaluated 13,205   11,846      
Recorded investment in loans, Collectively evaluated 1,607,536   1,374,624      
Allowance for loan losses, Total 16,140 $ 16,100 15,523 $ 15,579 $ 15,444 $ 14,855
Recorded investment in loans, Total 1,620,201   1,387,070      
Commercial [Member]            
Allowance for loan losses and recorded investment in loans by impairment methodology            
Allowance for loan losses, Individually evaluated 1,660   1,990      
Recorded investment in loans, Individually evaluated 8,408   8,664      
Allowance for loan losses, Collectively evaluated 8,990   7,947      
Recorded investment in loans, Collectively evaluated 1,075,641   898,289      
Allowance for loan losses, Total 10,640   9,937      
Recorded investment in loans, Total 1,084,049   906,953      
Consumer [Member]            
Allowance for loan losses and recorded investment in loans by impairment methodology            
Allowance for loan losses, Individually evaluated 1,275   1,687      
Recorded investment in loans, Individually evaluated 4,257   3,782      
Allowance for loan losses, Collectively evaluated 4,225   3,899      
Recorded investment in loans, Collectively evaluated 531,895   476,335      
Allowance for loan losses, Total 5,500   5,586      
Recorded investment in loans, Total $ 536,152   $ 480,117