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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