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Loans and Allowance for Loan Losses (Details 6) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Summary of nonperforming assets    
Nonaccruing troubled debt restructurings $ 2,826 $ 2,673
Total nonaccrual loans, including nonaccruing TDRs 7,274 7,301
Other real estate owned 242 242
Total nonperforming assets $ 7,516 $ 7,543
Nonperforming assets as a percentage of:    
Total assets 0.43% 0.46%
Gross loans 0.52% 0.54%
Total loans over 90 days past due $ 1,146 $ 2,027
Loans over 90 days past due and still accruing
Accruing troubled debt restructurings 5,648 5,145
Commercial [Member] | Construction [Member]    
Summary of nonperforming assets    
Nonaccruing troubled debt restructurings
Commercial [Member] | Owner occupied RE [Member]    
Summary of nonperforming assets    
Nonaccruing troubled debt restructurings
Commercial [Member] | Non-owner occupied RE [Member]    
Summary of nonperforming assets    
Nonaccruing troubled debt restructurings 1,525 1,581
Commercial [Member] | Business [Member]    
Summary of nonperforming assets    
Nonaccruing troubled debt restructurings 102 910
Consumer [Member] | Real estate [Member]    
Summary of nonperforming assets    
Nonaccruing troubled debt restructurings 1,091 992
Consumer [Member] | Home equity [Member]    
Summary of nonperforming assets    
Nonaccruing troubled debt restructurings 1,730 1,144
Consumer [Member] | Construction [Member]    
Summary of nonperforming assets    
Nonaccruing troubled debt restructurings
Consumer [Member] | Other [Member]    
Summary of nonperforming assets    
Nonaccruing troubled debt restructurings $ 1