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Investment Securities - Amortized Cost and Estimated Fair Values of Investments Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Debt Securities Available for Sale
Amortized Cost	$ 2,159,708	$ 2,384,325
Gross Unrealized Gains	1,099	525
Gross Unrealized Losses	(181,537)	(232,346)
Estimated Fair Value	1,979,270	2,152,504
Debt Securities Held to Maturity
Totals	117,259	133,494
Gross Unrealized Gains	10	6
Gross Unrealized Losses	(5,282)	(8,374)
Estimated Fair Value	111,987	125,126
Obligations of U.S. government agencies
Debt Securities Available for Sale
Amortized Cost	1,234,038	1,386,772
Gross Unrealized Gains	76	2
Gross Unrealized Losses	(132,117)	(165,037)
Estimated Fair Value	1,101,997	1,221,737
Debt Securities Held to Maturity
Totals	114,558	130,823
Gross Unrealized Gains	4	0
Gross Unrealized Losses	(5,253)	(8,331)
Estimated Fair Value	109,309	122,492
Obligations of states and political subdivisions
Debt Securities Available for Sale
Amortized Cost	249,709	262,879
Gross Unrealized Gains	159	268
Gross Unrealized Losses	(20,526)	(26,772)
Estimated Fair Value	229,342	236,375
Debt Securities Held to Maturity
Totals	2,701	2,671
Gross Unrealized Gains	6	6
Gross Unrealized Losses	(29)	(43)
Estimated Fair Value	2,678	2,634
Corporate bonds
Debt Securities Available for Sale
Amortized Cost	6,179	6,173
Gross Unrealized Gains	20	0
Gross Unrealized Losses	(335)	(571)
Estimated Fair Value	5,864	5,602
Asset backed securities
Debt Securities Available for Sale
Amortized Cost	364,561	359,214
Gross Unrealized Gains	492	255
Gross Unrealized Losses	(1,513)	(4,188)
Estimated Fair Value	363,540	355,281
Non-agency collateralized mortgage obligations
Debt Securities Available for Sale
Amortized Cost	305,221	369,287
Gross Unrealized Gains	352	0
Gross Unrealized Losses	(27,046)	(35,778)
Estimated Fair Value	$ 278,527	$ 333,509

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