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Securities - Amortized Cost and Fair Value of Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Amortized Cost, Due in one year or less	$ 6,397
Amortized Cost, Due after one year through five years	81,415
Amortized Cost, Due after five years through ten years	47,886
Amortized Cost, Due after ten years	294,352
Amortized Cost, Mortgage-backed securities	242,946
Amortized Cost, Total securities available for sale	672,996	$ 672,892
Fair Value, Due in one year or less	6,364
Fair Value, Due after one year through five years	75,493
Fair Value, Due after five years through ten years	46,479
Fair Value, Due after ten years	270,824
Fair Value, Mortgage-backed securities	210,605
Fair Value, Total securities available for sale	$ 609,765	$ 618,272

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