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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, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-sale, less than 12 months, fair value	$ 465,307	$ 4,465,728
Available-for-sale, less than 12 months, unrealized losses	(14,072)	(480,166)
Available-for-sale, 12 months or longer, fair value	5,559,525	1,992,246
Available-for-sale, 12 months or longer, unrealized losses	(1,129,229)	(367,308)
Available-for-sale, fair value	6,024,832	6,457,974
Available-for-sale, unrealized losses	(1,143,301)	(847,474)
U.S. Treasury
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-sale, less than 12 months, fair value	37,492	130,967
Available-for-sale, less than 12 months, unrealized losses	(144)	(3,264)
Available-for-sale, 12 months or longer, fair value	178,540	66,992
Available-for-sale, 12 months or longer, unrealized losses	(10,114)	(1,925)
Available-for-sale, fair value	216,032	197,959
Available-for-sale, unrealized losses	(10,258)	(5,189)
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	32,821	454,854
Available-for-sale, less than 12 months, unrealized losses	(58)	(75,795)
Available-for-sale, 12 months or longer, fair value	1,110,079	720,226
Available-for-sale, 12 months or longer, unrealized losses	(229,055)	(93,453)
Available-for-sale, fair value	1,142,900	1,175,080
Available-for-sale, unrealized losses	(229,113)	(169,248)
Mortgage-backed securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-sale, less than 12 months, fair value	124,895	3,207,319
Available-for-sale, less than 12 months, unrealized losses	(5,798)	(358,507)
Available-for-sale, 12 months or longer, fair value	3,736,306	1,116,205
Available-for-sale, 12 months or longer, unrealized losses	(817,962)	(258,921)
Available-for-sale, fair value	3,861,201	4,323,524
Available-for-sale, unrealized losses	(823,760)	(617,428)
States and political subdivisions
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-sale, less than 12 months, fair value	258,362	414,813
Available-for-sale, less than 12 months, unrealized losses	(7,749)	(25,555)
Available-for-sale, 12 months or longer, fair value	260,563	2,703
Available-for-sale, 12 months or longer, unrealized losses	(39,309)	(541)
Available-for-sale, fair value	518,925	417,516
Available-for-sale, unrealized losses	(47,058)	(26,096)
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	11,125	10,811
Available-for-sale, 12 months or longer, unrealized losses	(2,669)	(2,972)
Available-for-sale, fair value	11,125	10,811
Available-for-sale, unrealized losses	(2,669)	(2,972)
Other securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-sale, less than 12 months, fair value	11,737	257,775
Available-for-sale, less than 12 months, unrealized losses	(323)	(17,045)
Available-for-sale, 12 months or longer, fair value	262,912	75,309
Available-for-sale, 12 months or longer, unrealized losses	(30,120)	(9,496)
Available-for-sale, fair value	274,649	333,084
Available-for-sale, unrealized losses	$ (30,443)	$ (26,541)

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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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