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Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Amortized Cost, Due in one year or less	$ 8,840
Amortized Cost, Due after one year through five years	83,189
Amortized Cost, Due after five years through ten years	46,486
Amortized Cost, Due after ten years	279,292
Amortized Cost, Mortgage-backed securities	288,763
Amortized Cost, Total securities available for sale	706,570	$ 710,058
Fair Value, Due in one year or less	8,663
Fair Value, Due after one year through five years	79,209
Fair Value, Due after five years through ten years	45,737
Fair Value, Due after ten years	251,589
Fair Value, Mortgage-backed securities	260,947
Fair Value, Total securities available for sale	$ 646,145	$ 648,067

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