Fair Value - Level 3 Input Roll Forward, Recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 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	$ 8,391,906	$ 6,933,979	$ 7,667,505	$ 6,325,237
Purchases and issuances, net	1,259,911	728,013	3,348,364	1,910,535
Capitalization of interest and advances	15,282	10,770	40,618	31,608
Sales and repayments	(384,101)	(202,965)	(1,125,088)	(472,344)
Mortgage servicing rights resulting from loan sales	578,982	450,936	1,532,709	1,299,992
Changes in fair value included in income arising from:
Changes in instrument specific credit risk	36,968	15,520	82,121	36,014
Other factors	(477,547)	186,982	(577,586)	(54,294)
Total changes in fair value included in income	(440,579)	202,502	(495,465)	(18,280)
Transfers from Level 3 to Level 2	648,238	(496,019)	(1,915,061)	(1,272,912)
Transfers to real estate acquired in settlement of loans		(144)		(450)
Transfers to loans held for sale	(346,862)	(24,692)	(627,281)	(201,006)
Exchange of mortgage servicing spread for interest only stripped mortgage-backed securities	(121,520)	(98,066)	(121,520)	(98,066)
Balance at the end of the quarter	8,304,781	7,504,314	8,304,781	7,504,314
Changes in fair value recognized during the period relating to assets still held at the end of the quarter	(467,483)	248,267	(605,081)	(39,647)
Roll forward of liabilities measured using Level 3 inputs on a recurring basis
Balance at the beginning of the quarter	1,708	1,940	1,805	2,096
Changes in fair value included in income	10	(122)	(87)	(278)
Balance at the end of the quarter	1,718	1,818	1,718	1,818
Changes in fair value recognized during the period relating to liability still outstanding at the end of the quarter	10	(122)	(87)	(278)
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	400,076	392,758	478,564	345,772
Purchases and issuances, net	1,013,520	681,022	2,873,461	1,733,158
Capitalization of interest and advances	15,282	10,770	40,618	31,608
Sales and repayments	(384,101)	(202,892)	(1,125,088)	(472,039)
Changes in fair value included in income arising from:
Changes in instrument specific credit risk	36,968	15,520	82,121	36,014
Other factors	367	(1,831)	(741)	(1,967)
Total changes in fair value included in income	37,335	13,689	81,380	34,047
Transfers from Level 3 to Level 2	648,238	(496,019)	(1,915,061)	(1,272,912)
Transfers to real estate acquired in settlement of loans		(144)		(450)
Balance at the end of the quarter	433,874	399,184	433,874	399,184
Changes in fair value recognized during the period relating to assets still held at the end of the quarter	29,833	6,519	28,536	10,465
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	68,752	30,636	89,593	25,844
Purchases and issuances, net	246,391	46,991	474,903	177,377
Changes in fair value included in income arising from:
Other factors	150,334	(32,161)	181,400	18,559
Total changes in fair value included in income	150,334	(32,161)	181,400	18,559
Transfers to loans held for sale	(346,862)	(24,692)	(627,281)	(201,006)
Balance at the end of the quarter	118,615	20,774	118,615	20,774
Changes in fair value recognized during the period relating to assets still held at the end of the quarter	118,615	20,774	118,615	20,774
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	7,923,078	6,510,585	7,099,348	5,953,621
Sales and repayments		(73)		(305)
Mortgage servicing rights resulting from loan sales	578,982	450,936	1,532,709	1,299,992
Changes in fair value included in income arising from:
Other factors	(628,248)	220,974	(758,245)	(70,886)
Total changes in fair value included in income	(628,248)	220,974	(758,245)	(70,886)
Exchange of mortgage servicing spread for interest only stripped mortgage-backed securities	(121,520)	(98,066)	(121,520)	(98,066)
Balance at the end of the quarter	7,752,292	7,084,356	7,752,292	7,084,356
Changes in fair value recognized during the period relating to assets still held at the end of the quarter	$ (615,931)	$ 220,974	$ (752,232)	$ (70,886)