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Investment Securities - Available-for-Sale and Held-to-Maturity Investment Securities with Unrealized Losses by Aggregated Major Security Type and Length of Time in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	$ 1,126,895	$ 224,979
Available-for-Sale, Less than 12 Months, Unrealized Losses	(12,668)	(1,476)
Available-for-Sale, 12 months or longer, Fair Value	5,218,733	5,742,885
Available-for-Sale, 12 months or longer, Unrealized Losses	(884,848)	(872,667)
Available-for-Sale, Fair Value	6,345,628	5,967,864
Available-for-Sale, Unrealized Losses	(897,516)	(874,143)
U.S. Treasury
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	3,977	8,937
Available-for-Sale, Less than 12 Months, Unrealized Losses	(26)	(42)
Available-for-Sale, 12 months or longer, Fair Value	177,691	191,027
Available-for-Sale, 12 months or longer, Unrealized Losses	(12,633)	(11,899)
Available-for-Sale, Fair Value	181,668	199,964
Available-for-Sale, Unrealized Losses	(12,659)	(11,941)
U.S. government-sponsored entities and agencies
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	98,280	0
Available-for-Sale, Less than 12 Months, Unrealized Losses	(1,713)	0
Available-for-Sale, 12 months or longer, Fair Value	1,144,618	1,189,314
Available-for-Sale, 12 months or longer, Unrealized Losses	(179,647)	(192,717)
Available-for-Sale, Fair Value	1,242,898	1,189,314
Available-for-Sale, Unrealized Losses	(181,360)	(192,717)
Mortgage-backed securities
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	857,440	90,145
Available-for-Sale, Less than 12 Months, Unrealized Losses	(9,172)	(710)
Available-for-Sale, 12 months or longer, Fair Value	3,406,350	3,835,552
Available-for-Sale, 12 months or longer, Unrealized Losses	(653,009)	(621,142)
Available-for-Sale, Fair Value	4,263,790	3,925,697
Available-for-Sale, Unrealized Losses	(662,181)	(621,852)
States and political subdivisions
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	133,906	86,865
Available-for-Sale, Less than 12 Months, Unrealized Losses	(1,462)	(495)
Available-for-Sale, 12 months or longer, Fair Value	279,121	259,767
Available-for-Sale, 12 months or longer, Unrealized Losses	(24,419)	(22,562)
Available-for-Sale, Fair Value	413,027	346,632
Available-for-Sale, Unrealized Losses	(25,881)	(23,057)
Pooled trust preferred securities
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	0	0
Available-for-Sale, Less than 12 Months, Unrealized Losses	0	0
Available-for-Sale, 12 months or longer, Fair Value	11,322	11,337
Available-for-Sale, 12 months or longer, Unrealized Losses	(2,485)	(2,460)
Available-for-Sale, Fair Value	11,322	11,337
Available-for-Sale, Unrealized Losses	(2,485)	(2,460)
Other securities
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	33,292	39,032
Available-for-Sale, Less than 12 Months, Unrealized Losses	(295)	(229)
Available-for-Sale, 12 months or longer, Fair Value	199,631	255,888
Available-for-Sale, 12 months or longer, Unrealized Losses	(12,655)	(21,887)
Available-for-Sale, Fair Value	232,923	294,920
Available-for-Sale, Unrealized Losses	$ (12,950)	$ (22,116)

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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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