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Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Amortized Cost, Due in one year or less	$ 29,072
Amortized Cost, Due after one year through five years	64,212
Amortized Cost, Due after five years through ten years	50,092
Amortized Cost, Due after ten years	272,012
Amortized Cost, Mortgage-backed securities	290,574
Amortized Cost, Total securities available for sale	705,962	$ 710,058
Fair Value, Due in one year or less	28,481
Fair Value, Due after one year through five years	61,340
Fair Value, Due after five years through ten years	49,361
Fair Value, Due after ten years	241,474
Fair Value, Mortgage-backed securities	262,254
Fair Value, Total securities available for sale	$ 642,910	$ 648,067

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