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Securities - Securities Available for Sale (Detail) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 14,037,520	$ 13,999,900
Gross Unrealized Gains	68,628	117,987
Gross Unrealized Losses	(445,262)	(408,746)
Fair Value	13,660,886	13,709,141
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,252,751	2,301,248
Gross Unrealized Gains	8,082	20,008
Gross Unrealized Losses	(3,120)	(441)
Fair Value	2,257,713	2,320,815
U.S. Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	49,834	62,069
Gross Unrealized Gains	200	401
Gross Unrealized Losses	(66)	(100)
Fair Value	49,968	62,370
Mortgage-backed [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8,589,349	8,427,197
Gross Unrealized Gains	42,549	71,827
Gross Unrealized Losses	(344,025)	(331,151)
Fair Value	8,287,873	8,167,873
State and political subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,448,080	2,494,537
Gross Unrealized Gains	17,379	24,898
Gross Unrealized Losses	(94,003)	(72,847)
Fair Value	2,371,456	2,446,588
Corporates [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	142,631	180,854
Gross Unrealized Gains	267	349
Gross Unrealized Losses	(3,217)	(4,088)
Fair Value	139,681	177,115
Collateralized loan obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	554,875	533,995
Gross Unrealized Gains	151	504
Gross Unrealized Losses	(831)	(119)
Fair Value	$ 554,195	$ 534,380

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