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Fair Value Measurements and Disclosures - Additional Information (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available-for-sale, Estimated Fair Value | $ 44,071 | $ 24,005
Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available-for-sale, Estimated Fair Value | $ 44,100 | $ 24,000
Paycheck Protection Program Loans Federal Borrowings | Small Business Administration |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Paycheck protection program loans, fixed interest rate | 0.35% |

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