Fair Value - Level 3 Input Roll Forward, Recurring Basis (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Changes in fair value included in income arising from:
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, 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)
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)
Roll forward of liabilities measured using Level 3 inputs on a recurring basis
Mortgage servicing liabilities resulting from loan sales		$ 106,631	$ 23,325
Changes in fair value included in income		(1,037)	24,970
Recurring basis
Roll forward of assets measured using Level 3 inputs on a recurring basis
Balance at the beginning of the year	$ 5,329,147	7,933,369	3,455,505
Purchases and issuances, net	3,712,505	21,985,261	11,726,752
Capitalization of interest and advances	60,589	169,053	119,037
Sales and repayments	(1,378,441)	(11,783,818)	(2,389,763)
Mortgage servicing rights resulting from loan sales	1,718,094	1,861,949	1,138,045
Changes in fair value included in income arising from:
Changes in instrument specific credit risk	(41,483)	285,501	127,780
Other factors	(296,605)	(75,498)	(254,816)
Total changes in fair value included in income	(338,088)	210,003	(127,036)
Transfers from mortgage loans held for sale from Level 3 to Level 2	(2,736,940)	(12,547,732)	(3,246,282)
Transfers to real estate acquired in settlement of loans	(416)	(82)	(73)
Transfers from interest rate lock commitments to loans held for sale	(41,213)	(2,498,856)	(2,742,816)
Balance at the end of the year	6,325,237	5,329,147	7,933,369
Changes in fair value recognized during the period relating to assets still held at the end of the year	352,601	(220,336)	(678,634)
Roll forward of liabilities measured using Level 3 inputs on a recurring basis
Balance at the beginning of the year	2,816	177,074	207,726
Issuances		557	2,093
Accrual of interest on excess servicing spread financing		1,280	8,418
Repayment		(134,624)	(32,377)
Mortgage servicing liabilities resulting from loan sales		106,631	23,325
Changes in fair value included in income	(720)	(148,102)	(32,111)
Balance at the end of the year	2,096	2,816	177,074
Changes in fair value recognized during the period relating to liability still outstanding at the end of the year	(720)	(3,156)	(32,111)
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 year		131,750	178,586
Issuances		557	2,093
Accrual of interest on excess servicing spread financing		1,280	8,418
Repayment		(134,624)	(32,377)
Changes in fair value included in income		1,037	(24,970)
Balance at the end of the year			131,750
Changes in fair value recognized during the period relating to liability still outstanding at the end of the year			(24,970)
Recurring basis | Mortgage servicing liabilities
Roll forward of liabilities measured using Level 3 inputs on a recurring basis
Balance at the beginning of the year	2,816	45,324	29,140
Mortgage servicing liabilities resulting from loan sales		106,631	23,325
Changes in fair value included in income		(149,139)	(7,141)
Balance at the end of the year		2,816	45,324
Changes in fair value recognized during the period relating to liability still outstanding at the end of the year		(3,156)	(7,141)
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 year	1,128,876	4,675,169	383,878
Purchases and issuances, net	3,338,743	20,330,785	9,672,322
Capitalization of interest and advances	60,589	169,053	119,037
Sales and repayments	(1,378,441)	(11,783,818)	(2,381,493)
Changes in fair value included in income arising from:
Changes in instrument specific credit risk	(41,483)	285,501	127,780
Other factors	(25,156)
Total changes in fair value included in income	(66,639)	285,501	127,780
Transfers from mortgage loans held for sale from Level 3 to Level 2	(2,736,940)	(12,547,732)	(3,246,282)
Transfers to real estate acquired in settlement of loans	(416)	(82)	(73)
Balance at the end of the year	345,772	1,128,876	4,675,169
Changes in fair value recognized during the period relating to assets still held at the end of the year	(26,699)	22,516	153,474
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 year	322,193	677,026	136,650
Purchases and issuances, net	369,769	1,654,476	2,028,957
Changes in fair value included in income arising from:
Other factors	(624,905)	489,547	1,254,235
Total changes in fair value included in income	(624,905)	489,547	1,254,235
Transfers from interest rate lock commitments to loans held for sale	(41,213)	(2,498,856)	(2,742,816)
Balance at the end of the year	25,844	322,193	677,026
Changes in fair value recognized during the period relating to assets still held at the end of the year	25,844	322,193	677,026
Recurring basis | Repurchase agreement derivatives
Roll forward of assets measured using Level 3 inputs on a recurring basis
Balance at the beginning of the year			8,187
Sales and repayments			(8,270)
Changes in fair value included in income arising from:
Other factors			83
Total changes in fair value included in income			83
Recurring basis | Mortgage servicing rights
Roll forward of assets measured using Level 3 inputs on a recurring basis
Balance at the beginning of the year	3,878,078	2,581,174	2,926,790
Purchases and issuances, net	3,993		25,473
Mortgage servicing rights resulting from loan sales	1,718,094	1,861,949	1,138,045
Changes in fair value included in income arising from:
Other factors	353,456	(565,045)	(1,509,134)
Total changes in fair value included in income	353,456	(565,045)	(1,509,134)
Balance at the end of the year	5,953,621	3,878,078	2,581,174
Changes in fair value recognized during the period relating to assets still held at the end of the year	$ 353,456	$ (565,045)	$ (1,509,134)