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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	Sep. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-Sale, Less than 12 months, Fair Value	$ 222,111	$ 224,979
Available-for-Sale, Less than 12 months, Unrealized Losses	(1,175)	(1,476)
Available-for-Sale, 12 months or longer, Fair Value	5,563,631	5,742,885
Available-for-Sale, 12 months or longer, Unrealized Losses	(736,577)	(872,667)
Available-for-Sale, Fair Value	5,785,742	5,967,864
Available-for-Sale, Unrealized Losses	(737,752)	(874,143)
U.S. Treasury
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-Sale, Less than 12 months, Fair Value	1,998	8,937
Available-for-Sale, Less than 12 months, Unrealized Losses	(4)	(42)
Available-for-Sale, 12 months or longer, Fair Value	193,148	191,027
Available-for-Sale, 12 months or longer, Unrealized Losses	(13,072)	(11,899)
Available-for-Sale, Fair Value	195,146	199,964
Available-for-Sale, Unrealized Losses	(13,076)	(11,941)
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	55,754	0
Available-for-Sale, Less than 12 months, Unrealized Losses	(114)	0
Available-for-Sale, 12 months or longer, Fair Value	1,209,200	1,189,314
Available-for-Sale, 12 months or longer, Unrealized Losses	(160,718)	(192,717)
Available-for-Sale, Fair Value	1,264,954	1,189,314
Available-for-Sale, Unrealized Losses	(160,832)	(192,717)
Mortgage-backed securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-Sale, Less than 12 months, Fair Value	93,981	90,145
Available-for-Sale, Less than 12 months, Unrealized Losses	(786)	(710)
Available-for-Sale, 12 months or longer, Fair Value	3,633,891	3,835,552
Available-for-Sale, 12 months or longer, Unrealized Losses	(526,901)	(621,142)
Available-for-Sale, Fair Value	3,727,872	3,925,697
Available-for-Sale, Unrealized Losses	(527,687)	(621,852)
States and political subdivisions
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-Sale, Less than 12 months, Fair Value	22,970	86,865
Available-for-Sale, Less than 12 months, Unrealized Losses	(114)	(495)
Available-for-Sale, 12 months or longer, Fair Value	306,635	259,767
Available-for-Sale, 12 months or longer, Unrealized Losses	(20,928)	(22,562)
Available-for-Sale, Fair Value	329,605	346,632
Available-for-Sale, Unrealized Losses	(21,042)	(23,057)
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	11,157	11,337
Available-for-Sale, 12 months or longer, Unrealized Losses	(2,648)	(2,460)
Available-for-Sale, Fair Value	11,157	11,337
Available-for-Sale, Unrealized Losses	(2,648)	(2,460)
Other securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-Sale, Less than 12 months, Fair Value	47,408	39,032
Available-for-Sale, Less than 12 months, Unrealized Losses	(157)	(229)
Available-for-Sale, 12 months or longer, Fair Value	209,600	255,888
Available-for-Sale, 12 months or longer, Unrealized Losses	(12,310)	(21,887)
Available-for-Sale, Fair Value	257,008	294,920
Available-for-Sale, Unrealized Losses	$ (12,467)	$ (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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