Fair Value - Level 3 Input Roll Forward, Recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Roll forward of liabilities measured using Level 3 inputs on a recurring basis
Mortgage servicing liabilities resulting from loan sales				$ 64,383
Changes in fair value included in income				(1,037)
Recurring basis
Roll forward of assets measured using Level 3 inputs on a recurring basis
Balance at the beginning of the period	$ 5,521,528	$ 8,808,915	$ 5,329,147	7,933,369
Purchases and issuances, net	744,928	7,180,028	3,041,015	11,886,402
Capitalization of interest and advances	15,608	60,439	47,719	78,844
Sales and repayments	(129,896)	(3,866,340)	(1,264,888)	(4,795,241)
Mortgage servicing rights resulting from loan sales	398,253	483,362	1,014,555	953,895
Changes in fair value included in income arising from:
Changes in instrument specific credit risk	(24,394)	179,792	(30,210)	227,946
Other factors	(64,153)	(7,189)	(263,267)	30,401
Total changes in fair value included in income	(88,547)	172,603	(293,477)	258,347
Transfers from mortgage loans held for sale from Level 3 to Level 2	(723,995)	(4,585,789)	(2,089,966)	(7,424,910)
Transfers to real estate acquired in settlement of loans	(386)		(386)	(82)
Transfers from interest rate lock commitments to loans held for sale	48,378	(678,699)	2,152	(1,316,105)
Balance at the end of the period	5,785,871	7,574,519	5,785,871	7,574,519
Changes in fair value recognized during the period relating to assets still held at the end of the period	158,947	78,170	360,985	357,012
Roll forward of liabilities measured using Level 3 inputs on a recurring basis
Balance at the beginning of the period				177,074
Issuances				557
Accrual of interest on excess servicing spread financing				1,280
Repayment				(134,624)
Mortgage servicing liabilities resulting from loan sales				64,383
Changes in fair value included in income				(8,579)
Balance at the end of the period		100,091		100,091
Changes in fair value recognized during the period relating to liability still outstanding at the end of the period				(9,616)
Recurring basis | Excess servicing spread financing
Roll forward of liabilities measured using Level 3 inputs on a recurring basis
Balance at the beginning of the period	2,564			131,750
Issuances				557
Accrual of interest on excess servicing spread financing				1,280
Repayment				(134,624)
Changes in fair value included in income	(227)			1,037
Balance at the end of the period	2,337		2,337
Changes in fair value recognized during the period relating to liability still outstanding at the end of the period	(227)
Recurring basis | Mortgage servicing liabilities
Roll forward of assets measured using Level 3 inputs on a recurring basis
Mortgage servicing rights resulting from change in method of accounting		57,421
Roll forward of liabilities measured using Level 3 inputs on a recurring basis
Balance at the beginning of the period		46,026	2,816	45,324
Mortgage servicing liabilities resulting from loan sales				64,383
Changes in fair value included in income		(3,356)	(479)	(9,616)
Balance at the end of the period	2,337	100,091	2,337	100,091
Changes in fair value recognized during the period relating to liability still outstanding at the end of the period		(3,356)	(479)	(9,616)
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 period	776,590	5,202,065	1,128,876	4,675,169
Purchases and issuances, net	598,948	6,828,094	2,733,726	11,056,535
Capitalization of interest and advances	15,608	60,439	47,719	78,844
Sales and repayments	(129,896)	(3,866,340)	(1,264,888)	(4,795,241)
Changes in fair value included in income arising from:
Changes in instrument specific credit risk	(24,394)	179,792	(30,210)	227,946
Other factors	(8,922)		(21,318)
Total changes in fair value included in income	(33,316)	179,792	(51,528)	227,946
Transfers from mortgage loans held for sale from Level 3 to Level 2	(723,995)	(4,585,789)	(2,089,966)	(7,424,910)
Transfers to real estate acquired in settlement of loans	(386)		(386)	(82)
Balance at the end of the period	503,553	3,818,261	503,553	3,818,261
Changes in fair value recognized during the period relating to assets still held at the end of the period	(18,079)	74,184	(28,700)	135,823
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 period	37,899	337,940	322,193	677,026
Purchases and issuances, net	145,980	351,934	307,289	829,867
Changes in fair value included in income arising from:
Other factors	(167,106)	332,435	(566,483)	152,822
Total changes in fair value included in income	(167,106)	332,435	(566,483)	152,822
Transfers from interest rate lock commitments to loans held for sale	48,378	(678,699)	2,152	(1,316,105)
Balance at the end of the period	65,151	343,610	65,151	343,610
Changes in fair value recognized during the period relating to assets still held at the end of the period	65,151	343,610	65,151	343,610
Recurring basis | Mortgage servicing rights
Roll forward of assets measured using Level 3 inputs on a recurring basis
Balance at the beginning of the period	4,707,039	3,268,910	3,878,078	2,581,174
Mortgage servicing rights resulting from loan sales	398,253	483,362	1,014,555	953,895
Changes in fair value included in income arising from:
Other factors	111,875	(339,624)	324,534	(122,421)
Total changes in fair value included in income	111,875	(339,624)	324,534	(122,421)
Balance at the end of the period	5,217,167	3,412,648	5,217,167	3,412,648
Changes in fair value recognized during the period relating to assets still held at the end of the period	$ 111,875	$ (339,624)	$ 324,534	$ (122,421)