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Securities - Available for Sale Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost, Total securities available for sale	$ 672,996	$ 672,892
Gross Unrealized Gains	1,263	3,059
Gross Unrealized Losses	(64,494)	(57,679)
Fair Value	609,765	618,272
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	72,126	71,418
Gross Unrealized Gains	503	315
Gross Unrealized Losses	(4,222)	(4,075)
Fair Value	68,407	67,658
Obligations of States and Political Subdivisions [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost, Total securities available for sale	357,924	359,452
Gross Unrealized Gains	707	2,725
Gross Unrealized Losses	(27,878)	(23,578)
Fair Value	330,753	338,599
Mortgage-backed Securities in Government Sponsored Entities [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost, Total securities available for sale	242,946	242,022
Gross Unrealized Gains	53	19
Gross Unrealized Losses	(32,394)	(30,026)
Fair Value	$ 210,605	$ 212,015

X

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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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