Securities - Schedule of Fair Value and Amortized Cost of Available-for-sale and Held-to-maturity Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	$ 2,589,069	$ 2,874,776
Available-for-sale, Gross Unrealized Gains	20	271
Available-for-sale, Gross Unrealized Losses	(392,948)	(345,907)
Available-for-sale, Fair Value	2,196,141	2,529,140
Held-to-maturity, Amortized Cost	1,210,992	1,248,629
Held-to-maturity, Gross Unrealized Gains	62	577
Held-to-maturity, Gross Unrealized Losses	(212,067)	(164,816)
Held-to-maturity securities, Fair value	998,987	1,084,390
Total securities, Amortized Cost	3,800,061	4,123,405
Total securities, Gross Unrealized Gains	82	848
Total securities, Gross Unrealized Losses	(605,015)	(510,723)
Total securities, Fair Value	3,195,128	3,613,530
U.S. Government Sponsored Entities and Agencies [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	242,104	259,418
Available-for-sale, Gross Unrealized Gains		2
Available-for-sale, Gross Unrealized Losses	(40,592)	(33,450)
Available-for-sale, Fair Value	201,512	225,970
Held-to-maturity, Amortized Cost	3,807	4,357
Held-to-maturity, Gross Unrealized Losses	(433)	(416)
Held-to-maturity securities, Fair value	3,374	3,941
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	1,952,915	2,144,015
Available-for-sale, Gross Unrealized Gains	20	25
Available-for-sale, Gross Unrealized Losses	(337,659)	(297,987)
Available-for-sale, Fair Value	1,615,276	1,846,053
Held-to-maturity, Amortized Cost	40,527	45,909
Held-to-maturity, Gross Unrealized Losses	(4,647)	(3,809)
Held-to-maturity securities, Fair value	35,880	42,100
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	301,489	359,811
Available-for-sale, Gross Unrealized Losses	(8,242)	(10,080)
Available-for-sale, Fair Value	293,247	349,731
Obligations of State and Political Subdivisions [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	80,602	96,081
Available-for-sale, Gross Unrealized Gains		244
Available-for-sale, Gross Unrealized Losses	(6,155)	(4,097)
Available-for-sale, Fair Value	74,447	92,228
Held-to-maturity, Amortized Cost	1,146,362	1,177,986
Held-to-maturity, Gross Unrealized Gains	62	577
Held-to-maturity, Gross Unrealized Losses	(206,313)	(159,975)
Held-to-maturity securities, Fair value	940,111	1,018,588
Corporate Debt Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	11,959	15,451
Available-for-sale, Gross Unrealized Losses	(300)	(293)
Available-for-sale, Fair Value	11,659	15,158
Held-to-maturity, Amortized Cost	20,296	20,377
Held-to-maturity, Gross Unrealized Losses	(674)	(616)
Held-to-maturity securities, Fair value	$ 19,622	$ 19,761

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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Amount, before tax, of unrealized loss 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 of investment in debt security measured at amortized cost (held-to-maturity).

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This element represents the excess of the cost (face amount, notional amount) of an investment (security, contract) over its fair value which deficiency has not been recognized in earnings of the entity.

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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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