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Securities - Summary of Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale, Amortized Cost Basis, Total	$ 5,651,768	$ 5,155,305	$ 5,030,124
Securities available-for-sale, Gross Unrealized Holding Gains	22,975	673	4,373
Securities available-for-sale, Gross Unrealized Holding Losses	(413,930)	(538,219)	(422,198)
Estimated Fair Value	5,260,813	4,617,759	4,612,299
U.S. Treasury securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale, Amortized Cost Basis, Total	102,865	278,155	298,671
Securities available-for-sale, Gross Unrealized Holding Gains	2	2	14
Securities available-for-sale, Gross Unrealized Holding Losses	(897)	(4,595)	(5,671)
Estimated Fair Value	101,970	273,562	293,014
Obligations of State and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale, Amortized Cost Basis, Total	1,859,132	1,578,749	1,586,300
Securities available-for-sale, Gross Unrealized Holding Gains	8,751	338	699
Securities available-for-sale, Gross Unrealized Holding Losses	(133,972)	(138,842)	(115,516)
Estimated Fair Value	1,733,911	1,440,245	1,471,483
Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale, Amortized Cost Basis, Total	2,737,201	2,729,096	2,712,305
Securities available-for-sale, Gross Unrealized Holding Gains	5,622	184	1,655
Securities available-for-sale, Gross Unrealized Holding Losses	(272,025)	(378,746)	(290,030)
Estimated Fair Value	2,470,798	2,350,534	2,423,930
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale, Amortized Cost Basis, Total	849,026	457,311	320,685
Securities available-for-sale, Gross Unrealized Holding Gains	8,580	99	1,946
Securities available-for-sale, Gross Unrealized Holding Losses	(3,418)	(9,658)	(5,795)
Estimated Fair Value	854,188	447,752	316,836
Corporate Bonds and Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale, Amortized Cost Basis, Total	103,544	111,994	112,163
Securities available-for-sale, Gross Unrealized Holding Gains	20	50	59
Securities available-for-sale, Gross Unrealized Holding Losses	(3,618)	(6,378)	(5,186)
Estimated Fair Value	$ 99,946	$ 105,666	$ 107,036

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