Loans and Allowance for Loan Losses (Details 6) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Summary of nonperforming assets
Nonaccruing troubled debt restructurings	$ 3,509	$ 4,111
Total nonaccrual loans, including nonaccruing TDRs	8,069	6,794
Other real estate owned	1,169
Total nonperforming assets	$ 9,238	$ 6,794
Nonperforming assets as a percentage of:
Total assets	0.37%	0.30%
Gross loans	0.43%	0.35%
Total loans over 90 days past due	$ 2,296	$ 2,038
Loans over 90 days past due and still accruing
Accruing TDRs	4,893	5,219
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	1,143	188
Commercial [Member] | Business [Member]
Summary of nonperforming assets
Nonaccruing troubled debt restructurings	195	235
Commercial [Member] | Construction [Member]
Summary of nonperforming assets
Nonaccruing troubled debt restructurings	139
Consumer [Member] | Other [Member]
Summary of nonperforming assets
Nonaccruing troubled debt restructurings
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	2,536	1,829
Consumer [Member] | Home equity [Member]
Summary of nonperforming assets
Nonaccruing troubled debt restructurings	$ 547	$ 431