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Business Combinations - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Business Acquisition [Line Items] |  |  |  |  |  |  |
Common stock, shares, issued |  | 18,776,307 |  | 18,776,307 |  | 8,577,932 |
Options to acquire shares of common stock on post stock split basis | 148,764 |  |  |  |  |  |
Settlement of net debt |  |  |  |  | $ 349,000 |  |
Goodwill |  | $ 26,826,000 |  | $ 26,826,000 |  | $ 19,620,000 | [1]
Fair value adjustments of subordinated notes |  |  |  | $ 0 |  |  |
Statutory federal tax rate |  |  |  | 21.00% |  |  |
Core Deposits [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Amortized over an estimated useful life |  |  |  | 10 years |  |  |
Bay Banks [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Common stock shares received by shareholders | 0.5000 |  |  |  |  |  |
Common stock, shares, issued | 6,634,495 |  |  |  |  |  |
Business acquisition, common stock issued post stock split basis | 9,951,743 |  |  |  |  |  |
Fair value of consideration transferred | $ 124,900,000 |  |  |  |  |  |
Cash paid in lieu of fractional shares to common shareholders | $ 3,400 |  |  |  |  |  |
Option to purchase additional shares | 198,362 |  |  |  |  |  |
Options to acquire shares of common stock | 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 |  |  |  |  |  |
Merger-related expense |  | $ 1,400,000 | $ 1,300,000 | $ 11,700,000 | $ 1,700,000 |  |
Statutory federal tax rate | 21.00% |  |  |  |  |  |
Bay Banks [Member] | Subordinated Notes [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquired subordinated notes | $ 1,750,000 |  |  |  |  |  |
Bay Banks [Member] | Subordinated Notes [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquired subordinated notes | $ 1,100,000 |  |  |  |  |  |
[1] | Derived from audited December 31, 2020 Consolidated Financial Statements.

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