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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, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	$ 3,128,288	$ 654,262
Available-for-Sale, Less than 12 Months, Unrealized Losses	(64,711)	(4,917)
Available-for-Sale, 12 months or longer, Fair Value	378,065	36,356
Available-for-Sale, 12 months or longer, Unrealized Losses	(8,966)	(6,468)
Available-for-Sale, Fair Value	3,506,353	690,618
Available-for-Sale, Unrealized Losses	(73,677)	(11,385)
U.S. Treasury
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	0
Available-for-Sale, Less than 12 Months, Unrealized Losses	0
Available-for-Sale, 12 months or longer, Fair Value	237,577
Available-for-Sale, 12 months or longer, Unrealized Losses	(898)
Available-for-Sale, Fair Value	237,577
Available-for-Sale, Unrealized Losses	(898)	0
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	1,028,283	355,528
Available-for-Sale, Less than 12 Months, Unrealized Losses	(24,465)	(3,921)
Available-for-Sale, 12 months or longer, Fair Value	47,296	0
Available-for-Sale, 12 months or longer, Unrealized Losses	(1,703)	0
Available-for-Sale, Fair Value	1,075,579	355,528
Available-for-Sale, Unrealized Losses	(26,168)	(3,921)
Mortgage-backed securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	1,809,662	275,833
Available-for-Sale, Less than 12 Months, Unrealized Losses	(37,027)	(895)
Available-for-Sale, 12 months or longer, Fair Value	54,558	3,572
Available-for-Sale, 12 months or longer, Unrealized Losses	(1,633)	(95)
Available-for-Sale, Fair Value	1,864,220	279,405
Available-for-Sale, Unrealized Losses	(38,660)	(990)
States and political subdivisions
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	261,759	3,497
Available-for-Sale, Less than 12 Months, Unrealized Losses	(2,974)	(31)
Available-for-Sale, 12 months or longer, Fair Value	2,725	0
Available-for-Sale, 12 months or longer, Unrealized Losses	(44)	0
Available-for-Sale, Fair Value	264,484	3,497
Available-for-Sale, Unrealized Losses	(3,018)	(31)
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	9,367	7,913
Available-for-Sale, 12 months or longer, Unrealized Losses	(4,384)	(5,850)
Available-for-Sale, Fair Value	9,367	7,913
Available-for-Sale, Unrealized Losses	(4,384)	(5,850)
Other securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	28,584	19,404
Available-for-Sale, Less than 12 Months, Unrealized Losses	(245)	(70)
Available-for-Sale, 12 months or longer, Fair Value	26,542	24,871
Available-for-Sale, 12 months or longer, Unrealized Losses	(304)	(523)
Available-for-Sale, Fair Value	55,126	44,275
Available-for-Sale, Unrealized Losses	$ (549)	$ (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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