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Securities - Securities Available for Sale (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 10,956,847	$ 8,887,734
Gross Unrealized Gains	284,899	413,665
Gross Unrealized Losses	(79,056)	(1,711)
Fair Value	11,162,690	9,299,688
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	69,515	29,911
Gross Unrealized Gains	515	829
Gross Unrealized Losses	(171)
Fair Value	69,859	30,740
U.S. Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	89,113	89,554
Gross Unrealized Gains	4,542	6,395
Fair Value	93,655	95,949
Mortgage-backed [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,309,736	5,266,394
Gross Unrealized Gains	126,649	202,944
Gross Unrealized Losses	(66,164)	(1,157)
Fair Value	7,370,221	5,468,181
State and political subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,324,563	3,424,309
Gross Unrealized Gains	149,848	199,848
Gross Unrealized Losses	(12,508)	(538)
Fair Value	3,461,903	3,623,619
Corporates [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	163,920	77,566
Gross Unrealized Gains	3,345	3,649
Gross Unrealized Losses	(213)	(16)
Fair Value	$ 167,052	$ 81,199

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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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