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Business Combinations - Summary of Estimated Fair Value Adjustments of Consideration Paid, Acquired Asset and Assumed Liabilities (Parenthetical) (Detail) - USD ($) | 1 Months Ended | 9 Months Ended
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Apr. 30, 2021 | Mar. 31, 2021 | Jan. 31, 2021 | Sep. 30, 2021
Business Acquisition [Line Items] |  |  |  |
Stock split description | 3-for-2 stock split | In March 2021, the Company’s board of directors approved a three-for-two stock split (“Stock Split”) effected in the form of a 50% stock dividend on the Company’s common stock outstanding paid on April 30, 2021 to shareholders of record as of April 20, 2021. |  |
Statutory federal tax rate |  |  |  | 21.00%
Bay Banks [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Stock split description |  |  | Common shares issued and purchase price per share are presented on a post Stock Split basis |
Statutory federal tax rate |  |  | 21.00% |
FHLB advance assumed |  |  | $ 10,124,000 |
Bay Banks [Member] | Time Deposits [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Fair value adjustment (premium) |  |  | 5,800,000 |
Bay Banks [Member] | FHLB [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Fair value adjustment (premium) |  |  | 124,000 |
Bay Banks [Member] | Subordinated Notes [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Fair value adjustment (premium) |  |  | 950,000 |
Bay Banks [Member] | Core Deposits [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Fair value adjustment (premium) |  |  | 100,000 |
Bay Banks [Member] | Premises and Equipment [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Fair value adjustment (premium) |  |  | 4,400,000 |
Bay Banks [Member] | Deferred Tax Asset, Net [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Fair value adjustment (premium) |  |  | 2,100,000 |
Bay Banks [Member] | Core Deposits Intangible [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Fair value adjustment (premium) |  |  | 203,000 |
Bay Banks [Member] | Loan Held for Investment [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Fair value adjustment (premium) |  |  | $ 17,900,000 |
Fair value adjustment percentage |  |  | 1.70% |

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