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Business Combinations - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2021 | Jan. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Business Acquisition [Line Items] |  |  |  |
Common Stock Shares Issued |  |  | 18,774,082 | 8,577,932
Options To Acquire Shares Of Common Stock On Post Stock Split Basis |  | 148,758 |  |
Settlement of net debt |  |  |  | $ 349,000
Goodwill |  |  | 26,826,000 | 19,620,000
Fair Value Adjustment Of Subordinated Notes |  |  | 0 |
Bay Banks Of Virginia Inc [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash per share received by share holders | $ 12.55 | $ 12.55 |  |
Common stock shares received by shareholders | 0.5000 |  |  |
Common Stock Shares Issued | 6,634,495 | 6,634,495 |  |
Business acquisition, common stock issued post stock split basis | 9,951,743 |  |  |
fair value of consideration transferred | $ 124,900,000 |  |  |
Cash in lieu of fractional shares | $ 3,400 |  |  |
Option To Purchase Additional Shares | 198,362 |  |  |
Options To Acquire Shares Of Common | 99,176 |  |  |
Options To Acquire Shares Of Common Stock On Post Stock Split Basis | 148,764 |  |  |
Estimated fair value of common stock | $ 472,000 |  |  |
Settlement of net debt | 650,000 |  |  |
Goodwill | 7,206,000 | $ 7,206,000 |  |
Merger-related expense |  |  | $ 11,900,000 | $ 2,400,000
Bay Banks Of Virginia Inc [Member] | Subordinated Debt [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired subordinated notes | 1,750,000 |  |  |
Bay Banks Of Virginia Inc [Member] | Subordinated Debt One [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired subordinated notes | $ 1,100,000 |  |  |
Core Deposits [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Amortized over an estimated useful life |  |  | 10 years |

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