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Business Combinations - Summary of Fair Value Adjustments of Acquired Asset and Assumed Liabilities (Detail) - Bay Banks [Member] - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021
Business Acquisition [Line Items] |  |
Loans | $ (54) | $ 964
Time deposits | 827 | 2,465
FHLB borrowings | 4 | 10
Subordinated notes | 55 | 145
CDI | (323) | (880)
Net effect to income before income taxes | $ 509 | $ 2,704

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