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Investment Securities - Available-for-Sale 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, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-sale, less than 12 months, fair value	$ 5,405,772	$ 3,775,098
Available-for-sale, less than 12 months, unrealized losses	(549,090)	(90,987)
Available-for-sale, 12 months or longer, fair value	1,267,301	509,992
Available-for-sale, 12 months or longer, unrealized losses	(312,074)	(27,248)
Available-for-sale, fair value	6,673,073	4,285,090
Available-for-sale, unrealized losses	(861,164)	(118,235)
U.S. Treasury
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-sale, less than 12 months, fair value	193,605	91,063
Available-for-sale, less than 12 months, unrealized losses	(7,010)	(7,751)
Available-for-sale, 12 months or longer, fair value	0	0
Available-for-sale, 12 months or longer, unrealized losses	0	0
Available-for-sale, fair value	193,605	91,063
Available-for-sale, unrealized losses	(7,010)	(7,751)
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	639,031	1,032,566
Available-for-sale, less than 12 months, unrealized losses	(18,655)	(21,167)
Available-for-sale, 12 months or longer, fair value	530,776	312,949
Available-for-sale, 12 months or longer, unrealized losses	(150,308)	(15,847)
Available-for-sale, fair value	1,169,807	1,345,515
Available-for-sale, unrealized losses	(168,963)	(37,014)
Mortgage-backed securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-sale, less than 12 months, fair value	3,784,833	2,415,923
Available-for-sale, less than 12 months, unrealized losses	(462,383)	(59,277)
Available-for-sale, 12 months or longer, fair value	671,031	163,685
Available-for-sale, 12 months or longer, unrealized losses	(152,649)	(6,797)
Available-for-sale, fair value	4,455,864	2,579,608
Available-for-sale, unrealized losses	(615,032)	(66,074)
States and political subdivisions
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-sale, less than 12 months, fair value	503,025	178,570
Available-for-sale, less than 12 months, unrealized losses	(38,724)	(1,849)
Available-for-sale, 12 months or longer, fair value	1,850	2,729
Available-for-sale, 12 months or longer, unrealized losses	(564)	(33)
Available-for-sale, fair value	504,875	181,299
Available-for-sale, unrealized losses	(39,288)	(1,882)
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	11,322	9,496
Available-for-sale, 12 months or longer, unrealized losses	(2,454)	(4,260)
Available-for-sale, fair value	11,322	9,496
Available-for-sale, unrealized losses	(2,454)	(4,260)
Other securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-sale, less than 12 months, fair value	285,278	56,976
Available-for-sale, less than 12 months, unrealized losses	(22,318)	(943)
Available-for-sale, 12 months or longer, fair value	52,322	21,133
Available-for-sale, 12 months or longer, unrealized losses	(6,099)	(311)
Available-for-sale, fair value	337,600	78,109
Available-for-sale, unrealized losses	$ (28,417)	$ (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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