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Securities - Available for Sale Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost, Total securities available for sale	$ 705,613	$ 710,058
Gross Unrealized Gains	1,221	882
Gross Unrealized Losses	(52,218)	(62,873)
Fair Value	654,616	648,067
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost, Total securities available for sale	67,035	100,378
Gross Unrealized Gains	238	303
Gross Unrealized Losses	(1,527)	(3,294)
Fair Value	65,746	97,387
Obligations of States and Political Subdivisions [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost, Total securities available for sale	346,530	351,635
Gross Unrealized Gains	547	482
Gross Unrealized Losses	(25,471)	(26,998)
Fair Value	321,606	325,119
Mortgage-backed Securities in Government Sponsored Entities [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost, Total securities available for sale	292,048	258,045
Gross Unrealized Gains	436	97
Gross Unrealized Losses	(25,220)	(32,581)
Fair Value	$ 267,264	$ 225,561

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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