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Investment Securities - Additional Information (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) Security | Sep. 30, 2020 Security | Sep. 30, 2021 USD ($) Security | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |  |  |
Number of available-for-sale securities in unrealized loss position less than 12 months | Security | 23 |  | 23 |  |
Number of available-for-sale securities in unrealized loss position 12 months or greater | Security | 2 |  | 2 |  |
Gain on sale of available for sale securities | $ |  |  | $ 0 | $ 20,000 |
Sales of available-for-sale securities, book value | $ |  |  |  | $ 1,700,000 |
Sales of available-for-sale securities | Security | 0 | 0 | 0 |  |
Carrying value of available-for-sale securities pledged to secure public deposits | $ | $ 44,071,000 |  | $ 44,071,000 |  | $ 24,005,000
Collateral Pledged |  |  |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |  |  |
Carrying value of available-for-sale securities pledged to secure public deposits | $ | $ 1,500,000 |  | $ 1,500,000 |  | 2,300,000
Government Agency Securities |  |  |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |  |  |
Number of available-for-sale securities in unrealized loss position less than 12 months | Security | 2 |  | 2 |  |
U.S. Treasury Strip Bonds |  |  |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |  |  |
Number of available-for-sale securities in unrealized loss position less than 12 months | Security | 1 |  | 1 |  |
Carrying value of available-for-sale securities pledged to secure public deposits | $ | $ 4,083,000 |  | $ 4,083,000 |  |
Government Agency Mortgage-Backed Securities |  |  |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |  |  |
Number of available-for-sale securities in unrealized loss position less than 12 months | Security | 12 |  | 12 |  |
Carrying value of available-for-sale securities pledged to secure public deposits | $ | $ 20,335,000 |  | $ 20,335,000 |  | 9,532,000
Municipal Securities - Tax Exempt |  |  |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |  |  |
Number of available-for-sale securities in unrealized loss position less than 12 months | Security | 2 |  | 2 |  |
Carrying value of available-for-sale securities pledged to secure public deposits | $ | $ 533,000 |  | $ 533,000 |  |
Corporate Securities |  |  |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |  |  |
Number of available-for-sale securities in unrealized loss position less than 12 months | Security | 8 |  | 8 |  |
Carrying value of available-for-sale securities pledged to secure public deposits | $ | $ 6,625,000 |  | $ 6,625,000 |  | $ 2,614,000

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