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Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Amortized Cost, Due in one year or less	$ 30,107
Amortized Cost, Due after one year through five years	63,042
Amortized Cost, Due after five years through ten years	59,369
Amortized Cost, Due after ten years	261,047
Amortized Cost, Mortgage-backed securities	292,048
Amortized Cost, Total securities available for sale	705,613	$ 710,058
Fair Value, Due in one year or less	29,753
Fair Value, Due after one year through five years	60,790
Fair Value, Due after five years through ten years	59,031
Fair Value, Due after ten years	237,778
Fair Value, Mortgage-backed securities	267,264
Fair Value, Total securities available for sale	$ 654,616	$ 648,067

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