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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	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-Sale, Less than 12 months, Fair Value	$ 524,251	$ 1,126,895
Available-for-Sale, Less than 12 months, Unrealized Losses	(4,038)	(12,668)
Available-for-Sale, 12 months or longer, Fair Value	5,209,608	5,218,733
Available-for-Sale, 12 months or longer, Unrealized Losses	(792,895)	(884,848)
Available-for-Sale, Fair Value	5,733,859	6,345,628
Available-for-Sale, Unrealized Losses	(796,933)	(897,516)
U.S. Treasury
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-Sale, Less than 12 months, Fair Value	1,990	3,977
Available-for-Sale, Less than 12 months, Unrealized Losses	(12)	(26)
Available-for-Sale, 12 months or longer, Fair Value	181,477	177,691
Available-for-Sale, 12 months or longer, Unrealized Losses	(10,919)	(12,633)
Available-for-Sale, Fair Value	183,467	181,668
Available-for-Sale, Unrealized Losses	(10,931)	(12,659)
U.S. government-sponsored entities and agencies
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-Sale, Less than 12 months, Fair Value	69,755	98,280
Available-for-Sale, Less than 12 months, Unrealized Losses	(407)	(1,713)
Available-for-Sale, 12 months or longer, Fair Value	1,159,566	1,144,618
Available-for-Sale, 12 months or longer, Unrealized Losses	(161,277)	(179,647)
Available-for-Sale, Fair Value	1,229,321	1,242,898
Available-for-Sale, Unrealized Losses	(161,684)	(181,360)
Mortgage-backed securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-Sale, Less than 12 months, Fair Value	341,754	857,440
Available-for-Sale, Less than 12 months, Unrealized Losses	(1,990)	(9,172)
Available-for-Sale, 12 months or longer, Fair Value	3,389,956	3,406,350
Available-for-Sale, 12 months or longer, Unrealized Losses	(580,811)	(653,009)
Available-for-Sale, Fair Value	3,731,710	4,263,790
Available-for-Sale, Unrealized Losses	(582,801)	(662,181)
States and political subdivisions
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-Sale, Less than 12 months, Fair Value	94,378	133,906
Available-for-Sale, Less than 12 months, Unrealized Losses	(1,592)	(1,462)
Available-for-Sale, 12 months or longer, Fair Value	261,158	279,121
Available-for-Sale, 12 months or longer, Unrealized Losses	(27,481)	(24,419)
Available-for-Sale, Fair Value	355,536	413,027
Available-for-Sale, Unrealized Losses	(29,073)	(25,881)
Pooled trust preferred securities
Debt Securities, Available-for-sale, Unrealized Loss Position [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	11,311	11,322
Available-for-Sale, 12 months or longer, Unrealized Losses	(2,498)	(2,485)
Available-for-Sale, Fair Value	11,311	11,322
Available-for-Sale, Unrealized Losses	(2,498)	(2,485)
Other securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-Sale, Less than 12 months, Fair Value	16,374	33,292
Available-for-Sale, Less than 12 months, Unrealized Losses	(37)	(295)
Available-for-Sale, 12 months or longer, Fair Value	206,140	199,631
Available-for-Sale, 12 months or longer, Unrealized Losses	(9,909)	(12,655)
Available-for-Sale, Fair Value	222,514	232,923
Available-for-Sale, Unrealized Losses	$ (9,946)	$ (12,950)

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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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