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Loans and Allowance for Loan Losses - Additional Information (Details) | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) Contract Loan | Sep. 30, 2020 USD ($) Contract | Dec. 31, 2020 USD ($) Loan | Dec. 31, 2019 USD ($)
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Qualifying loans pledged to secure the line of credit from FHLB | $ 328,600,000 |  | $ 309,900,000 |
Troubled debt restructurings that have subsequently defaulted, recorded investment | $ 0 | $ 0 |  |
Troubled Debt Restructurings that have Subsequently Defaulted, Number of Contracts | Contract | 1 | 0 |  |
Allowance for loan losses | $ 7,631,000 |  | 6,361,000 | $ 4,134,000
Modified Loan Terms |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Allowance for loan losses | 8,000 |  | 17,000 |
90 Days or Greater Past Due |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due | $ 0 |  | $ 0 |
Small Business Administration |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Number of paycheck protection program loans | Loan | 730 |  | 1,171 |
Paycheck protection program loans | $ 66,100,000 |  | $ 130,300,000 |

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