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Loans and Allowance for Loan Losses (Details 6) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Summary of nonperforming assets, including nonaccruing TDRs    
Nonaccruing troubled debt restructurings $ 730 $ 990
Total nonaccrual loans, including nonaccruing TDRs 5,603 5,482
Other real estate owned 420 639
Total nonperforming assets $ 6,023 $ 6,121
Nonperforming assets as a percentage of:    
Total assets 0.39% 0.46%
Gross loans 0.45% 0.53%
Total loans over 90 days past due $ 1,401 $ 1,984
Loans over 90 days past due and still accruing
Accruing troubled debt restructurings 6,954 5,675
Commercial [Member] | Owner occupied RE [Member]    
Summary of nonperforming assets, including nonaccruing TDRs    
Total nonaccrual loans, including nonaccruing TDRs 244 276
Commercial [Member] | Non-owner occupied RE [Member]    
Summary of nonperforming assets, including nonaccruing TDRs    
Total nonaccrual loans, including nonaccruing TDRs 2,049 2,711
Commercial [Member] | Construction [Member]    
Summary of nonperforming assets, including nonaccruing TDRs    
Total nonaccrual loans, including nonaccruing TDRs
Commercial [Member] | Business [Member]    
Summary of nonperforming assets, including nonaccruing TDRs    
Total nonaccrual loans, including nonaccruing TDRs 1,116 686
Consumer [Member] | Real estate [Member]    
Summary of nonperforming assets, including nonaccruing TDRs    
Total nonaccrual loans, including nonaccruing TDRs 1,267 550
Consumer [Member] | Home equity [Member]    
Summary of nonperforming assets, including nonaccruing TDRs    
Total nonaccrual loans, including nonaccruing TDRs 195 256
Consumer [Member] | Construction [Member]    
Summary of nonperforming assets, including nonaccruing TDRs    
Total nonaccrual loans, including nonaccruing TDRs
Consumer [Member] | Other [Member]    
Summary of nonperforming assets, including nonaccruing TDRs    
Total nonaccrual loans, including nonaccruing TDRs $ 2 $ 13