Securities - Schedule of Fair Value and Amortized Cost of Available-for-sale and Held-to-maturity Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	$ 3,116,057	$ 3,019,695
Available-for-sale, Gross Unrealized Gains	973	30,542
Available-for-sale, Gross Unrealized Losses	(232,379)	(36,775)
Available-for-sale, Estimated Fair Value	2,884,651	3,013,462
Held-to-maturity, Amortized Cost	1,281,295	1,004,823
Held-to-maturity, Gross Unrealized Gains	1,957	27,153
Held-to-maturity, Gross Unrealized Losses	(129,658)	(3,524)
Held-to-maturity securities, Fair value	1,153,594	1,028,452
Total securities, Amortized Cost	4,397,352	4,024,518
Total securities, Gross Unrealized Gains	2,930	57,695
Total securities, Gross Unrealized Losses	(362,037)	(40,299)
Total securities, Estimated Fair Value	4,038,245	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	271,157	236,096
Available-for-sale, Gross Unrealized Gains	72	3,922
Available-for-sale, Gross Unrealized Losses	(22,300)	(3,040)
Available-for-sale, Estimated Fair Value	248,929	236,978
Held-to-maturity, Amortized Cost	5,004	5,944
Held-to-maturity, Gross Unrealized Gains		72
Held-to-maturity, Gross Unrealized Losses	(293)	(8)
Held-to-maturity securities, Fair value	4,711	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	2,290,292	2,301,170
Available-for-sale, Gross Unrealized Gains	107	16,489
Available-for-sale, Gross Unrealized Losses	(201,112)	(32,446)
Available-for-sale, Estimated Fair Value	2,089,287	2,285,213
Held-to-maturity, Amortized Cost	50,587	58,147
Held-to-maturity, Gross Unrealized Gains	49	1,409
Held-to-maturity, Gross Unrealized Losses	(2,075)	(16)
Held-to-maturity securities, Fair value	48,561	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	437,571	364,486
Available-for-sale, Gross Unrealized Gains	222	4,252
Available-for-sale, Gross Unrealized Losses	(5,965)	(1,245)
Available-for-sale, Estimated Fair Value	431,828	367,493
Obligations of State and Political Subdivisions [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	101,592	101,003
Available-for-sale, Gross Unrealized Gains	548	5,372
Available-for-sale, Gross Unrealized Losses	(2,830)	(35)
Available-for-sale, Estimated Fair Value	99,310	106,340
Held-to-maturity, Amortized Cost	1,200,398	907,649
Held-to-maturity, Gross Unrealized Gains	1,890	23,854
Held-to-maturity, Gross Unrealized Losses	(127,136)	(3,500)
Held-to-maturity securities, Fair value	1,075,152	928,003
Corporate Debt Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	15,445	16,940
Available-for-sale, Gross Unrealized Gains	24	507
Available-for-sale, Gross Unrealized Losses	(172)	(9)
Available-for-sale, Estimated Fair Value	15,297	17,438
Held-to-maturity, Amortized Cost	25,306	33,083
Held-to-maturity, Gross Unrealized Gains	18	1,818
Held-to-maturity, Gross Unrealized Losses	(154)
Held-to-maturity securities, Fair value	$ 25,170	$ 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 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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Securities amortized cost.

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