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Securities - Available for Sale Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost, Total securities available for sale	$ 706,570	$ 710,058
Gross Unrealized Gains	829	882
Gross Unrealized Losses	(61,254)	(62,873)
Fair Value	646,145	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	67,118	100,378
Gross Unrealized Gains	307	303
Gross Unrealized Losses	(2,441)	(3,294)
Fair Value	64,984	97,387
Obligations of States and Political Subdivisions [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost, Total securities available for sale	350,689	351,635
Gross Unrealized Gains	197	482
Gross Unrealized Losses	(30,672)	(26,998)
Fair Value	320,214	325,119
Mortgage-backed Securities in Government Sponsored Entities [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost, Total securities available for sale	288,763	258,045
Gross Unrealized Gains	325	97
Gross Unrealized Losses	(28,141)	(32,581)
Fair Value	$ 260,947	$ 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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