Loans and Allowance for Loan Losses (Details 6) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Summary of nonperforming assets
Nonaccruing troubled debt restructurings	$ 4,111	$ 2,541
Total nonaccrual loans, including nonaccruing TDRs	6,794	5,830
Other real estate owned			$ 242
Total nonperforming assets	$ 6,794	$ 5,830
Nonperforming assets as a percentage of:
Total assets	0.30%	0.31%
Gross loans	0.35%	0.35%
Total loans over 90 days past due	$ 2,038	$ 458
Loans over 90 days past due and still accruing
Accruing TDRs	5,219	6,742
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	188	210
Commercial [Member] | Business [Member]
Summary of nonperforming assets
Nonaccruing troubled debt restructurings	235	81
Commercial [Member] | Construction [Member]
Summary of nonperforming assets
Nonaccruing troubled debt restructurings
Consumer [Member] | Other [Member]
Summary of nonperforming assets
Nonaccruing troubled debt restructurings		12
Consumer [Member] | Construction [Member]
Summary of nonperforming assets
Nonaccruing troubled debt restructurings
Consumer [Member] | Real estate [Member]
Summary of nonperforming assets
Nonaccruing troubled debt restructurings	1,829	1,980
Consumer [Member] | Home equity [Member]
Summary of nonperforming assets
Nonaccruing troubled debt restructurings	$ 431	$ 1,006