Securities - Schedule of Fair Value and Amortized Cost of Available-for-sale and Held-to-maturity Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	$ 2,437,733	$ 2,501,188
Available-for-sale, Gross Unrealized Gains	120	225
Available-for-sale, Gross Unrealized Losses	(318,581)	(307,084)
Available-for-sale, Fair Value	2,119,272	2,194,329
Held-to-maturity, Amortized Cost	1,190,010	1,199,527
Held-to-maturity, Gross Unrealized Gains	356	852
Held-to-maturity, Gross Unrealized Losses	(137,922)	(131,220)
Held-to-maturity securities, Fair value	1,052,444	1,069,159
Total securities, Amortized Cost	3,627,743	3,700,715
Total securities, Gross Unrealized Gains	476	1,077
Total securities, Gross Unrealized Losses	(456,503)	(438,304)
Total securities, Fair Value	3,171,716	3,263,488
U.S. Government Sponsored Entities and Agencies [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	234,707	238,676
Available-for-sale, Gross Unrealized Losses	(32,998)	(30,310)
Available-for-sale, Fair Value	201,709	208,366
Held-to-maturity, Amortized Cost	3,533	3,587
Held-to-maturity, Gross Unrealized Losses	(342)	(313)
Held-to-maturity securities, Fair value	3,191	3,274
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	1,849,231	1,897,511
Available-for-sale, Gross Unrealized Gains	46	47
Available-for-sale, Gross Unrealized Losses	(276,658)	(267,874)
Available-for-sale, Fair Value	1,572,619	1,629,684
Held-to-maturity, Amortized Cost	37,408	38,893
Held-to-maturity, Gross Unrealized Losses	(3,222)	(3,017)
Held-to-maturity securities, Fair value	34,186	35,876
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	265,195	274,220
Available-for-sale, Gross Unrealized Gains	38	11
Available-for-sale, Gross Unrealized Losses	(5,386)	(5,924)
Available-for-sale, Fair Value	259,847	268,307
Obligations of State and Political Subdivisions [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	76,635	78,819
Available-for-sale, Gross Unrealized Gains	36	167
Available-for-sale, Gross Unrealized Losses	(3,384)	(2,861)
Available-for-sale, Fair Value	73,287	76,125
Held-to-maturity, Amortized Cost	1,128,828	1,136,779
Held-to-maturity, Gross Unrealized Gains	356	852
Held-to-maturity, Gross Unrealized Losses	(133,972)	(127,518)
Held-to-maturity securities, Fair value	995,212	1,010,113
Corporate Debt Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	11,965	11,962
Available-for-sale, Gross Unrealized Losses	(155)	(115)
Available-for-sale, Fair Value	11,810	11,847
Held-to-maturity, Amortized Cost	20,241	20,268
Held-to-maturity, Gross Unrealized Losses	(386)	(372)
Held-to-maturity securities, Fair value	$ 19,855	$ 19,896

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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Amount of accumulated unrealized loss 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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