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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, 2021	Dec. 31, 2020
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	$ 3,019,695	$ 1,916,658
Available-for-sale, Gross Unrealized Gains	30,542	63,237
Available-for-sale, Gross Unrealized Losses	(36,775)	(1,759)
Available-for-sale, Estimated Fair Value	3,013,462	1,978,136
Held-to-maturity, Amortized Cost	1,004,823	731,212
Held-to-maturity, Gross Unrealized Gains	27,153	37,030
Held-to-maturity, Gross Unrealized Losses	(3,524)	(59)
Held-to-maturity securities, Fair value	1,028,452	768,183
Total securities, Amortized Cost	4,024,518	2,647,870
Total securities, Gross Unrealized Gains	57,695	100,267
Total securities, Gross Unrealized Losses	(40,299)	(1,818)
Total securities, Estimated Fair Value	4,041,914	2,746,319
US Treasury Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost		39,975
Available-for-sale, Gross Unrealized Gains		7
Available-for-sale, Estimated Fair Value		39,982
U.S. Government Sponsored Entities and Agencies [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	236,096	204,109
Available-for-sale, Gross Unrealized Gains	3,922	7,715
Available-for-sale, Gross Unrealized Losses	(3,040)	(142)
Available-for-sale, Estimated Fair Value	236,978	211,682
Held-to-maturity, Amortized Cost	5,944	7,779
Held-to-maturity, Gross Unrealized Gains	72	265
Held-to-maturity, Gross Unrealized Losses	(8)
Held-to-maturity securities, Fair value	6,008	8,044
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	2,301,170	1,230,106
Available-for-sale, Gross Unrealized Gains	16,489	35,979
Available-for-sale, Gross Unrealized Losses	(32,446)	(1,348)
Available-for-sale, Estimated Fair Value	2,285,213	1,264,737
Held-to-maturity, Amortized Cost	58,147	89,151
Held-to-maturity, Gross Unrealized Gains	1,409	3,251
Held-to-maturity, Gross Unrealized Losses	(16)
Held-to-maturity securities, Fair value	59,540	92,402
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	364,486	308,903
Available-for-sale, Gross Unrealized Gains	4,252	11,464
Available-for-sale, Gross Unrealized Losses	(1,245)	(269)
Available-for-sale, Estimated Fair Value	367,493	320,098
Obligations of State and Political Subdivisions [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	101,003	108,602
Available-for-sale, Gross Unrealized Gains	5,372	7,160
Available-for-sale, Gross Unrealized Losses	(35)
Available-for-sale, Estimated Fair Value	106,340	115,762
Held-to-maturity, Amortized Cost	907,649	601,128
Held-to-maturity, Gross Unrealized Gains	23,854	30,173
Held-to-maturity, Gross Unrealized Losses	(3,500)	(59)
Held-to-maturity securities, Fair value	928,003	631,242
Corporate Debt Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	16,940	24,963
Available-for-sale, Gross Unrealized Gains	507	912
Available-for-sale, Gross Unrealized Losses	(9)
Available-for-sale, Estimated Fair Value	17,438	25,875
Held-to-maturity, Amortized Cost	33,083	33,154
Held-to-maturity, Gross Unrealized Gains	1,818	3,341
Held-to-maturity securities, Fair value	$ 34,901	$ 36,495

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