Securities - Summary of Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Schedule of Available-for-sale Securities [Line Items]
Securities, available-for-sale, amortized cost	$ 6,030,335	$ 5,856,138
Securities available-for-sale, Gross Unrealized Holding Gains	22,413	31,536
Securities available-for-sale, Gross Unrealized Holding Losses	(376,791)	(373,561)
Estimated Fair Value	5,675,957	5,514,113
U.S. Treasury securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities, available-for-sale, amortized cost		61,136
Securities available-for-sale, Gross Unrealized Holding Gains		1
Securities available-for-sale, Gross Unrealized Holding Losses		(324)
Estimated Fair Value		60,813
Obligations of State and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities, available-for-sale, amortized cost	1,828,793	1,851,327
Securities available-for-sale, Gross Unrealized Holding Gains	18,133	13,943
Securities available-for-sale, Gross Unrealized Holding Losses	(93,033)	(113,897)
Estimated Fair Value	1,753,893	1,751,373
Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities, available-for-sale, amortized cost	2,906,479	2,856,717
Securities available-for-sale, Gross Unrealized Holding Gains	2,411	7,768
Securities available-for-sale, Gross Unrealized Holding Losses	(271,191)	(253,075)
Estimated Fair Value	2,637,699	2,611,410
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities, available-for-sale, amortized cost	1,199,894	982,567
Securities available-for-sale, Gross Unrealized Holding Gains	1,869	9,801
Securities available-for-sale, Gross Unrealized Holding Losses	(9,372)	(3,130)
Estimated Fair Value	1,192,391	989,238
Corporate Bonds and Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities, available-for-sale, amortized cost	95,169	104,391
Securities available-for-sale, Gross Unrealized Holding Gains	0	23
Securities available-for-sale, Gross Unrealized Holding Losses	(3,195)	(3,135)
Estimated Fair Value	$ 91,974	$ 101,279

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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