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Debt Securities - Schedule of Amortized Cost, Unrealized Gains and Losses, and Fair Values of Securities Classified as AFS and HTM (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Debt securities available for sale
Amortized Cost	$ 2,875,848	$ 4,013,523
Gross unrealized gains	60	22,382
Gross unrealized losses	(328,867)	(54,654)
Fair Value	2,547,041	3,981,251
Debt securities held to maturity
Amortized Cost	936,328	0
Gross unrealized gains	0
Gross unrealized losses	(127,443)
Fair Value	808,885
U.S. Treasury securities
Debt securities available for sale
Amortized Cost	145,495	166,768
Gross unrealized gains	0	41
Gross unrealized losses	(4,653)	(1,047)
Fair Value	140,842	165,762
Obligations of U.S. government corporations and agencies
Debt securities available for sale
Amortized Cost	25,287	37,579
Gross unrealized gains	4	891
Gross unrealized losses	(358)	0
Fair Value	24,933	38,470
Obligations of states and political subdivisions
Debt securities available for sale
Amortized Cost	298,653	300,602
Gross unrealized gains	35	7,760
Gross unrealized losses	(27,853)	(1,493)
Fair Value	270,835	306,869
Asset-backed securities
Debt securities available for sale
Amortized Cost	490,076	492,055
Gross unrealized gains	0	295
Gross unrealized losses	(23,552)	(164)
Fair Value	466,524	492,186
Commercial mortgage-backed securities
Debt securities available for sale
Amortized Cost	98,719	625,339
Gross unrealized gains	0	3,425
Gross unrealized losses	(10,968)	(13,766)
Fair Value	87,751	614,998
Debt securities held to maturity
Amortized Cost	486,116
Gross unrealized gains	0
Gross unrealized losses	(60,341)
Fair Value	425,775
Residential mortgage-backed securities
Debt securities available for sale
Amortized Cost	1,538,308	2,095,104
Gross unrealized gains	1	8,889
Gross unrealized losses	(233,995)	(34,680)
Fair Value	1,304,314	2,069,313
Debt securities held to maturity
Amortized Cost	450,212
Gross unrealized gains	0
Gross unrealized losses	(67,102)
Fair Value	383,110
Corporate debt securities
Debt securities available for sale
Amortized Cost	279,310	296,076
Gross unrealized gains	20	1,081
Gross unrealized losses	(27,488)	(3,504)
Fair Value	$ 251,842	$ 293,653

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Amount, before tax, of unrealized gain 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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