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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, 2021	Dec. 31, 2020
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	$ 3,775,098	$ 654,262
Available-for-Sale, Less than 12 Months, Unrealized Losses	(90,987)	(4,917)
Available-for-Sale, 12 months or longer, Fair Value	509,992	36,356
Available-for-Sale, 12 months or longer, Unrealized Losses	(27,248)	(6,468)
Available-for-Sale, Fair Value	4,285,090	690,618
Available-for-Sale, Unrealized Losses	(118,235)	(11,385)
U.S. Treasury
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	91,063
Available-for-Sale, Less than 12 Months, Unrealized Losses	(7,751)
Available-for-Sale, 12 months or longer, Fair Value	0
Available-for-Sale, 12 months or longer, Unrealized Losses	0
Available-for-Sale, Fair Value	91,063
Available-for-Sale, Unrealized Losses	(7,751)	0
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	1,032,566	355,528
Available-for-Sale, Less than 12 Months, Unrealized Losses	(21,167)	(3,921)
Available-for-Sale, 12 months or longer, Fair Value	312,949	0
Available-for-Sale, 12 months or longer, Unrealized Losses	(15,847)	0
Available-for-Sale, Fair Value	1,345,515	355,528
Available-for-Sale, Unrealized Losses	(37,014)	(3,921)
Mortgage-backed securities
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	2,415,923	275,833
Available-for-Sale, Less than 12 Months, Unrealized Losses	(59,277)	(895)
Available-for-Sale, 12 months or longer, Fair Value	163,685	3,572
Available-for-Sale, 12 months or longer, Unrealized Losses	(6,797)	(95)
Available-for-Sale, Fair Value	2,579,608	279,405
Available-for-Sale, Unrealized Losses	(66,074)	(990)
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	178,570	3,497
Available-for-Sale, Less than 12 Months, Unrealized Losses	(1,849)	(31)
Available-for-Sale, 12 months or longer, Fair Value	2,729	0
Available-for-Sale, 12 months or longer, Unrealized Losses	(33)	0
Available-for-Sale, Fair Value	181,299	3,497
Available-for-Sale, Unrealized Losses	(1,882)	(31)
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	9,496	7,913
Available-for-Sale, 12 months or longer, Unrealized Losses	(4,260)	(5,850)
Available-for-Sale, Fair Value	9,496	7,913
Available-for-Sale, Unrealized Losses	(4,260)	(5,850)
Other securities
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	56,976	19,404
Available-for-Sale, Less than 12 Months, Unrealized Losses	(943)	(70)
Available-for-Sale, 12 months or longer, Fair Value	21,133	24,871
Available-for-Sale, 12 months or longer, Unrealized Losses	(311)	(523)
Available-for-Sale, Fair Value	78,109	44,275
Available-for-Sale, Unrealized Losses	$ (1,254)	$ (593)

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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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