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Nature of Operations - Additional Information (Details) $ / shares in Units, $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jan. 20, 2021 USD ($) $ / shares shares | Sep. 30, 2021 shares | Sep. 30, 2020 shares | Sep. 30, 2021 shares | Sep. 30, 2020 shares
Basis Of Presentation [Line Items] |  |  |  |  |
Sale of stock, gross proceeds | $ 37.1 |  |  |  |
Sale of stock, number of common stock issued | shares | 3,701,509 |  |  |  |
Sale of stock, price per share | $ / shares | $ 10.00 |  |  |  |
Cash contributions to Employee Stock Ownership Plan ("ESOP") | $ 3.0 |  |  |  |
Employee stock ownership plan per share | $ / shares | $ 10.00 |  |  |  |
Offering expenses | $ 1.7 |  |  |  |
Amount invested in bank operations | $ 16.3 |  |  |  |
Common stock exchange ratio | 0.90686 |  |  |  |
Options to purchase shares excluded from calculation of diluted earnings per common share | shares |  | 0 | 90,441 | 0 | 90,441
Community First Bancshares, MHC |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |
Common stock ownership percentage | 54.00% |  | 54.00% |  | 54.00%

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