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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, 2022	Dec. 31, 2021
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	$ 4,465,728	$ 3,775,098
Available-for-Sale, Less than 12 Months, Unrealized Losses	(480,166)	(90,987)
Available-for-Sale, 12 months or longer, Fair Value	1,992,246	509,992
Available-for-Sale, 12 months or longer, Unrealized Losses	(367,308)	(27,248)
Available-for-Sale, Fair Value	6,457,974	4,285,090
Available-for-Sale, Unrealized Losses	(847,474)	(118,235)
U.S. Treasury
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	130,967	91,063
Available-for-Sale, Less than 12 Months, Unrealized Losses	(3,264)	(7,751)
Available-for-Sale, 12 months or longer, Fair Value	66,992	0
Available-for-Sale, 12 months or longer, Unrealized Losses	(1,925)	0
Available-for-Sale, Fair Value	197,959	91,063
Available-for-Sale, Unrealized Losses	(5,189)	(7,751)
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	454,854	1,032,566
Available-for-Sale, Less than 12 Months, Unrealized Losses	(75,795)	(21,167)
Available-for-Sale, 12 months or longer, Fair Value	720,226	312,949
Available-for-Sale, 12 months or longer, Unrealized Losses	(93,453)	(15,847)
Available-for-Sale, Fair Value	1,175,080	1,345,515
Available-for-Sale, Unrealized Losses	(169,248)	(37,014)
Mortgage-backed securities
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	3,207,319	2,415,923
Available-for-Sale, Less than 12 Months, Unrealized Losses	(358,507)	(59,277)
Available-for-Sale, 12 months or longer, Fair Value	1,116,205	163,685
Available-for-Sale, 12 months or longer, Unrealized Losses	(258,921)	(6,797)
Available-for-Sale, Fair Value	4,323,524	2,579,608
Available-for-Sale, Unrealized Losses	(617,428)	(66,074)
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	414,813	178,570
Available-for-Sale, Less than 12 Months, Unrealized Losses	(25,555)	(1,849)
Available-for-Sale, 12 months or longer, Fair Value	2,703	2,729
Available-for-Sale, 12 months or longer, Unrealized Losses	(541)	(33)
Available-for-Sale, Fair Value	417,516	181,299
Available-for-Sale, Unrealized Losses	(26,096)	(1,882)
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	10,811	9,496
Available-for-Sale, 12 months or longer, Unrealized Losses	(2,972)	(4,260)
Available-for-Sale, Fair Value	10,811	9,496
Available-for-Sale, Unrealized Losses	(2,972)	(4,260)
Other securities
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	257,775	56,976
Available-for-Sale, Less than 12 Months, Unrealized Losses	(17,045)	(943)
Available-for-Sale, 12 months or longer, Fair Value	75,309	21,133
Available-for-Sale, 12 months or longer, Unrealized Losses	(9,496)	(311)
Available-for-Sale, Fair Value	333,084	78,109
Available-for-Sale, Unrealized Losses	$ (26,541)	$ (1,254)

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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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