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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
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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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