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Securities - Available for Sale Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost, Total securities available for sale	$ 671,665	$ 672,892
Debt securities, Gross Unrealized Gains	2,916	3,059
Debt securities, Gross Unrealized Losses	(47,793)	(57,679)
Debt securities, Fair Value	626,788	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	71,255	71,418
Debt securities, Gross Unrealized Gains	457	315
Debt securities, Gross Unrealized Losses	(2,514)	(4,075)
Debt securities, Fair Value	69,198	67,658
Obligations of States and Political Subdivisions [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost, Total securities available for sale	356,332	359,452
Debt securities, Gross Unrealized Gains	2,162	2,725
Debt securities, Gross Unrealized Losses	(20,689)	(23,578)
Debt securities, Fair Value	337,805	338,599
Mortgage-backed Securities in Government Sponsored Entities [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost, Total securities available for sale	244,078	242,022
Debt securities, Gross Unrealized Gains	297	19
Debt securities, Gross Unrealized Losses	(24,590)	(30,026)
Debt securities, Fair Value	$ 219,785	$ 212,015

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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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