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Securities - Securities Available for Sale (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 13,747,149	$ 8,407,676
Gross Unrealized Gains	98,466	4,823
Gross Unrealized Losses	(467,335)	(638,165)
Fair Value	13,378,280	7,774,334
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,180,744	1,331,394
Gross Unrealized Gains	17,757	2,751
Gross Unrealized Losses	(750)	(8,072)
Fair Value	2,197,751	1,326,073
U.S. Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	81,171	129,246
Gross Unrealized Gains	422	126
Gross Unrealized Losses	(167)	(325)
Fair Value	81,426	129,047
Mortgage-backed [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8,160,828	4,945,548
Gross Unrealized Gains	55,196	339
Gross Unrealized Losses	(373,749)	(524,957)
Fair Value	7,842,275	4,420,930
State and political subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,541,797	1,309,126
Gross Unrealized Gains	23,996	487
Gross Unrealized Losses	(86,291)	(91,044)
Fair Value	2,479,502	1,218,569
Corporates [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	228,546	330,739
Gross Unrealized Gains	217	60
Gross Unrealized Losses	(6,227)	(13,629)
Fair Value	222,536	317,170
Collateralized loan obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	554,063	361,623
Gross Unrealized Gains	878	1,060
Gross Unrealized Losses	(151)	(138)
Fair Value	$ 554,790	$ 362,545

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