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Securities - Schedule of Fair Value and Amortized Cost of Available-for-sale and Held-to-maturity Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	$ 2,874,776	$ 3,019,695
Available-for-sale, Gross Unrealized Gains	271	30,542
Available-for-sale, Gross Unrealized Losses	(345,907)	(36,775)
Available-for-sale, Estimated Fair Value	2,529,140	3,013,462
Held-to-maturity, Amortized Cost	1,248,629	1,004,823
Held-to-maturity, Gross Unrealized Gains	577	27,153
Held-to-maturity, Gross Unrealized Losses	(164,816)	(3,524)
Held-to-maturity securities, Fair value	1,084,390	1,028,452
Total securities, Amortized Cost	4,123,405	4,024,518
Total securities, Gross Unrealized Gains	848	57,695
Total securities, Gross Unrealized Losses	(510,723)	(40,299)
Total securities, Estimated Fair Value	3,613,530	4,041,914
U.S. Government Sponsored Entities and Agencies [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	259,418	236,096
Available-for-sale, Gross Unrealized Gains	2	3,922
Available-for-sale, Gross Unrealized Losses	(33,450)	(3,040)
Available-for-sale, Estimated Fair Value	225,970	236,978
Held-to-maturity, Amortized Cost	4,357	5,944
Held-to-maturity, Gross Unrealized Gains		72
Held-to-maturity, Gross Unrealized Losses	(416)	(8)
Held-to-maturity securities, Fair value	3,941	6,008
Residential Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	2,144,015	2,301,170
Available-for-sale, Gross Unrealized Gains	25	16,489
Available-for-sale, Gross Unrealized Losses	(297,987)	(32,446)
Available-for-sale, Estimated Fair Value	1,846,053	2,285,213
Held-to-maturity, Amortized Cost	45,909	58,147
Held-to-maturity, Gross Unrealized Gains		1,409
Held-to-maturity, Gross Unrealized Losses	(3,809)	(16)
Held-to-maturity securities, Fair value	42,100	59,540
Commercial Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	359,811	364,486
Available-for-sale, Gross Unrealized Gains		4,252
Available-for-sale, Gross Unrealized Losses	(10,080)	(1,245)
Available-for-sale, Estimated Fair Value	349,731	367,493
Obligations of State and Political Subdivisions [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	96,081	101,003
Available-for-sale, Gross Unrealized Gains	244	5,372
Available-for-sale, Gross Unrealized Losses	(4,097)	(35)
Available-for-sale, Estimated Fair Value	92,228	106,340
Held-to-maturity, Amortized Cost	1,177,986	907,649
Held-to-maturity, Gross Unrealized Gains	577	23,854
Held-to-maturity, Gross Unrealized Losses	(159,975)	(3,500)
Held-to-maturity securities, Fair value	1,018,588	928,003
Corporate Debt Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	15,451	16,940
Available-for-sale, Gross Unrealized Gains		507
Available-for-sale, Gross Unrealized Losses	(293)	(9)
Available-for-sale, Estimated Fair Value	15,158	17,438
Held-to-maturity, Amortized Cost	20,377	33,083
Held-to-maturity, Gross Unrealized Gains		1,818
Held-to-maturity, Gross Unrealized Losses	(616)
Held-to-maturity securities, Fair value	$ 19,761	$ 34,901

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