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Securities - Schedule of Fair Value and Amortized Cost of Available-for-sale and Held-to-maturity Securities (Parenthetical) (Detail) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]    
Allowance for credit losses, held-to-maturity debt securities $ 137 $ 146