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Securities - Available for Sale Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost, Total securities available for sale	$ 705,962	$ 710,058
Gross Unrealized Gains	822	882
Gross Unrealized Losses	(63,874)	(62,873)
Fair Value	642,910	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	66,118	100,378
Gross Unrealized Gains	258	303
Gross Unrealized Losses	(2,055)	(3,294)
Fair Value	64,321	97,387
Obligations of States and Political Subdivisions [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost, Total securities available for sale	349,270	351,635
Gross Unrealized Gains	119	482
Gross Unrealized Losses	(33,054)	(26,998)
Fair Value	316,335	325,119
Mortgage-backed Securities in Government Sponsored Entities [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost, Total securities available for sale	290,574	258,045
Gross Unrealized Gains	445	97
Gross Unrealized Losses	(28,765)	(32,581)
Fair Value	$ 262,254	$ 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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