Fair Value - Level 3 Input Roll Forward, Recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Changes in fair value included in income arising from:
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Servicing Asset at Fair Value, Period Increase (Decrease)	Servicing Asset at Fair Value, Period Increase (Decrease)	Servicing Asset at Fair Value, Period Increase (Decrease)	Servicing Asset at Fair Value, Period Increase (Decrease)
Recurring basis
Roll forward of assets measured using Level 3 inputs on a recurring basis
Balance at the beginning of the quarter	$ 8,019,410	$ 6,375,025	$ 7,667,505	$ 6,325,237
Purchases and issuances, net	1,082,322	682,364	2,088,453	1,182,522
Capitalization of interest and advances	14,110	13,183	25,336	20,838
Sales and repayments	(356,988)	(146,289)	(740,987)	(269,379)
Mortgage servicing rights resulting from loan sales	541,207	562,523	953,727	849,056
Changes in fair value included in income arising from:
Changes in instrument specific credit risk	28,011	10,951	45,153	20,494
Other factors	(82,333)	(77,949)	(100,039)	(241,276)
Total changes in fair value included in income	(54,322)	(66,998)	(54,886)	(220,782)
Transfers from Level 3 to Level 2	(704,994)	(411,179)	(1,266,823)	(776,893)
Transfers to real estate acquired in settlement of loans		(254)		(306)
Transfers to loans held for sale	(148,839)	(74,396)	(280,419)	(176,314)
Balance at the end of the quarter	8,391,906	6,933,979	8,391,906	6,933,979
Changes in fair value recognized during the period relating to assets still held at the end of the quarter	(10,903)	(18,824)	(40,328)	(250,578)
Roll forward of liabilities measured using Level 3 inputs on a recurring basis
Balance at the beginning of the quarter	1,732	2,011	1,805	2,096
Changes in fair value included in income	(24)	(71)	(97)	(156)
Balance at the end of the quarter	1,708	1,940	1,708	1,940
Changes in fair value recognized during the period relating to liability still outstanding at the end of the quarter	(24)	(71)	(97)	(156)
Recurring basis | Mortgage loans held for sale
Roll forward of assets measured using Level 3 inputs on a recurring basis
Balance at the beginning of the quarter	466,392	312,789	478,564	345,772
Purchases and issuances, net	954,081	614,486	1,859,941	1,052,136
Capitalization of interest and advances	14,110	13,183	25,336	20,838
Sales and repayments	(356,988)	(146,289)	(740,987)	(269,147)
Changes in fair value included in income arising from:
Changes in instrument specific credit risk	28,011	10,951	45,153	20,494
Other factors	(536)	(929)	(1,108)	(136)
Total changes in fair value included in income	27,475	10,022	44,045	20,358
Transfers from Level 3 to Level 2	(704,994)	(411,179)	(1,266,823)	(776,893)
Transfers to real estate acquired in settlement of loans		(254)		(306)
Balance at the end of the quarter	400,076	392,758	400,076	392,758
Changes in fair value recognized during the period relating to assets still held at the end of the quarter	21,684	5,868	20,917	10,646
Recurring basis | Interest rate lock commitments
Roll forward of assets measured using Level 3 inputs on a recurring basis
Balance at the beginning of the quarter	69,808	58,846	89,593	25,844
Purchases and issuances, net	128,241	67,878	228,512	130,386
Changes in fair value included in income arising from:
Other factors	19,542	(21,692)	31,066	50,720
Total changes in fair value included in income	19,542	(21,692)	31,066	50,720
Transfers to loans held for sale	(148,839)	(74,396)	(280,419)	(176,314)
Balance at the end of the quarter	68,752	30,636	68,752	30,636
Changes in fair value recognized during the period relating to assets still held at the end of the quarter	68,752	30,636	68,752	30,636
Recurring basis | Mortgage servicing rights
Roll forward of assets measured using Level 3 inputs on a recurring basis
Balance at the beginning of the quarter	7,483,210	6,003,390	7,099,348	5,953,621
Sales and repayments				(232)
Mortgage servicing rights resulting from loan sales	541,207	562,523	953,727	849,056
Changes in fair value included in income arising from:
Other factors	(101,339)	(55,328)	(129,997)	(291,860)
Total changes in fair value included in income	(101,339)	(55,328)	(129,997)	(291,860)
Balance at the end of the quarter	7,923,078	6,510,585	7,923,078	6,510,585
Changes in fair value recognized during the period relating to assets still held at the end of the quarter	$ (101,339)	$ (55,328)	$ (129,997)	$ (291,860)