Securities - Schedule of Fair Value and Amortized Cost of Available-for-sale and Held-to-maturity Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	$ 2,996,453	$ 3,019,695
Available-for-sale, Gross Unrealized Gains	94	30,542
Available-for-sale, Gross Unrealized Losses	(350,799)	(36,775)
Available-for-sale, Estimated Fair Value	2,645,748	3,013,462
Held-to-maturity, Amortized Cost	1,262,467	1,004,823
Held-to-maturity, Gross Unrealized Gains	204	27,153
Held-to-maturity, Gross Unrealized Losses	(196,838)	(3,524)
Held-to-maturity securities, Fair value	1,065,833	1,028,452
Total securities, Amortized Cost	4,258,920	4,024,518
Total securities, Gross Unrealized Gains	298	57,695
Total securities, Gross Unrealized Losses	(547,637)	(40,299)
Total securities, Estimated Fair Value	3,711,581	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	263,336	236,096
Available-for-sale, Gross Unrealized Gains	1	3,922
Available-for-sale, Gross Unrealized Losses	(34,491)	(3,040)
Available-for-sale, Estimated Fair Value	228,846	236,978
Held-to-maturity, Amortized Cost	4,871	5,944
Held-to-maturity, Gross Unrealized Gains		72
Held-to-maturity, Gross Unrealized Losses	(474)	(8)
Held-to-maturity securities, Fair value	4,397	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	2,210,727	2,301,170
Available-for-sale, Gross Unrealized Gains	20	16,489
Available-for-sale, Gross Unrealized Losses	(301,086)	(32,446)
Available-for-sale, Estimated Fair Value	1,909,661	2,285,213
Held-to-maturity, Amortized Cost	47,973	58,147
Held-to-maturity, Gross Unrealized Gains		1,409
Held-to-maturity, Gross Unrealized Losses	(4,213)	(16)
Held-to-maturity securities, Fair value	43,760	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	407,299	364,486
Available-for-sale, Gross Unrealized Gains	3	4,252
Available-for-sale, Gross Unrealized Losses	(9,004)	(1,245)
Available-for-sale, Estimated Fair Value	398,298	367,493
Obligations of State and Political Subdivisions [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	99,643	101,003
Available-for-sale, Gross Unrealized Gains	69	5,372
Available-for-sale, Gross Unrealized Losses	(5,886)	(35)
Available-for-sale, Estimated Fair Value	93,826	106,340
Held-to-maturity, Amortized Cost	1,189,219	907,649
Held-to-maturity, Gross Unrealized Gains	204	23,854
Held-to-maturity, Gross Unrealized Losses	(191,468)	(3,500)
Held-to-maturity securities, Fair value	997,955	928,003
Corporate Debt Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	15,448	16,940
Available-for-sale, Gross Unrealized Gains	1	507
Available-for-sale, Gross Unrealized Losses	(332)	(9)
Available-for-sale, Estimated Fair Value	15,117	17,438
Held-to-maturity, Amortized Cost	20,404	33,083
Held-to-maturity, Gross Unrealized Gains		1,818
Held-to-maturity, Gross Unrealized Losses	(683)
Held-to-maturity securities, Fair value	$ 19,721	$ 34,901

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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Amortized cost of 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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Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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