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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