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Investment Securities - Amortized Cost and Estimated Fair Values of Investments Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Debt Securities Available for Sale
Amortized Cost	$ 2,138,533	$ 2,384,325
Gross Unrealized Gains	1,007	525
Gross Unrealized Losses	(234,655)	(232,346)
Estimated Fair Value	1,904,885	2,152,504
Debt Securities Held to Maturity
Amortized Cost	111,866	133,494
Gross Unrealized Gains	5	6
Gross Unrealized Losses	(7,522)	(8,374)
Estimated Fair Value	104,349	125,126
Obligations of U.S. government agencies
Debt Securities Available for Sale
Amortized Cost	1,268,654	1,386,772
Gross Unrealized Gains	16	2
Gross Unrealized Losses	(174,485)	(165,037)
Estimated Fair Value	1,094,185	1,221,737
Debt Securities Held to Maturity
Amortized Cost	109,155	130,823
Gross Unrealized Gains	3	0
Gross Unrealized Losses	(7,443)	(8,331)
Estimated Fair Value	101,715	122,492
Obligations of states and political subdivisions
Debt Securities Available for Sale
Amortized Cost	249,627	262,879
Gross Unrealized Gains	66	268
Gross Unrealized Losses	(28,949)	(26,772)
Estimated Fair Value	220,744	236,375
Debt Securities Held to Maturity
Amortized Cost	2,711	2,671
Gross Unrealized Gains	2	6
Gross Unrealized Losses	(79)	(43)
Estimated Fair Value	2,634	2,634
Corporate bonds
Debt Securities Available for Sale
Amortized Cost	6,182	6,173
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(345)	(571)
Estimated Fair Value	5,837	5,602
Asset backed securities
Debt Securities Available for Sale
Amortized Cost	314,814	359,214
Gross Unrealized Gains	687	255
Gross Unrealized Losses	(1,238)	(4,188)
Estimated Fair Value	314,263	355,281
Non-agency collateralized mortgage obligations
Debt Securities Available for Sale
Amortized Cost	299,256	369,287
Gross Unrealized Gains	238	0
Gross Unrealized Losses	(29,638)	(35,778)
Estimated Fair Value	$ 269,856	$ 333,509

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