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Loans and Allowance for Loan Losses (Details 6) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Summary of nonperforming assets, including nonaccruing TDRs    
Nonaccruing troubled debt restructurings $ 979 $ 990
Total nonaccrual loans, including nonaccruing TDRs 6,178 5,482
Other real estate owned 669 639
Total nonperforming assets $ 6,847 $ 6,121
Nonperforming assets as a percentage of:    
Total assets 0.47% 0.46%
Gross loans 0.56% 0.53%
Total loans over 90 days past due $ 1,688 $ 1,984
Loans over 90 days past due and still accruing
Accruing troubled debt restructurings 5,795 5,675
Commercial [Member] | Owner occupied RE [Member]    
Summary of nonperforming assets, including nonaccruing TDRs    
Total nonaccrual loans, including nonaccruing TDRs 266 276
Commercial [Member] | Non-owner occupied RE [Member]    
Summary of nonperforming assets, including nonaccruing TDRs    
Total nonaccrual loans, including nonaccruing TDRs 2,514 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 1,616 686
Consumer [Member] | Real estate [Member]    
Summary of nonperforming assets, including nonaccruing TDRs    
Total nonaccrual loans, including nonaccruing TDRs 541 550
Consumer [Member] | Home equity [Member]    
Summary of nonperforming assets, including nonaccruing TDRs    
Total nonaccrual loans, including nonaccruing TDRs 257 256
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 $ 5 $ 13