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Loans and Allowance for Credit Losses on Loans - Aging of Past Due Loans by Class of Loans - Additional Information (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Aging of Past Due Loans by Class of Loans
Past due loans 30 day or greater	$ 6,229,000	$ 15,315,000
Nonaccrual loans		8,675,000
30 days or greater past due
Aging of Past Due Loans by Class of Loans
Nonaccrual loans	1,918,000	7,413,000
Less than 30 days past due
Aging of Past Due Loans by Class of Loans
Nonaccrual loans	$ 5,870,000	1,262,000
Commercial
Aging of Past Due Loans by Class of Loans
Past due loans 30 day or greater		10,084,000
Nonaccrual loans		3,444,000
CRE
Aging of Past Due Loans by Class of Loans
Nonaccrual loans		5,094,000
CRE - owner occupied
Aging of Past Due Loans by Class of Loans
Past due loans 30 day or greater		5,094,000
Home equity
Aging of Past Due Loans by Class of Loans
Past due loans 30 day or greater		137,000
Nonaccrual loans		$ 137,000

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