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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2021
Business Acquisition [Line Items] |  |
Loans | $ 746 | $ 1,018
Time deposits | 951 | 1,638
FHLB borrowings | 4 | 6
Subordinated notes | 55 | 90
CDI | (331) | (557)
Net effect to income before income taxes | $ 1,425 | $ 2,195

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