Fair Value - Level 3 Input Roll Forward, Recurring Basis (Details) - Recurring basis - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Roll forward of assets measured using Level 3 inputs on a recurring basis
Balance at the beginning of the period	$ 6,375,025	$ 5,521,528	$ 6,325,237	$ 5,329,147
Purchases and issuances, net	682,364	744,928	1,182,522	3,041,015
Capitalization of interest and advances	13,183	15,608	20,838	47,719
Sales and repayments	(146,289)	(129,896)	(269,379)	(1,264,888)
Mortgage servicing rights resulting from loan sales	562,523	398,253	849,056	1,014,555
Changes in fair value included in income arising from:
Changes in instrument specific credit risk	10,951	(24,394)	20,494	(30,210)
Other factors	(77,949)	(64,153)	(241,276)	(263,267)
Total changes in fair value included in income	(66,998)	(88,547)	(220,782)	(293,477)
Transfers from Level 3 to Level 2	(411,179)	(723,995)	(776,893)	(2,089,966)
Transfers to real estate acquired in settlement of loans	(254)	(386)	(306)	(386)
Transfers to loans held for sale	(74,396)	48,378	(176,314)	2,152
Balance at the end of the period	6,933,979	5,785,871	6,933,979	5,785,871
Changes in fair value recognized during the period relating to assets still held at the end of the period	(18,824)	158,947	(250,578)	360,985
Excess servicing spread financing
Roll forward of liabilities measured using Level 3 inputs on a recurring basis
Balance at the beginning of the period	2,011
Changes in fair value included in income	(71)
Balance at the end of the period	1,940		1,940
Changes in fair value recognized during the period relating to liability still outstanding at the end of the period	(71)
Mortgage servicing liabilities
Roll forward of liabilities measured using Level 3 inputs on a recurring basis
Balance at the beginning of the period		2,564	2,096	2,816
Changes in fair value included in income		(227)	(156)	(479)
Balance at the end of the period	1,940	2,337	1,940	2,337
Changes in fair value recognized during the period relating to liability still outstanding at the end of the period		(227)	(156)	(479)
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	312,789	776,590	345,772	1,128,876
Purchases and issuances, net	614,486	598,948	1,052,136	2,733,726
Capitalization of interest and advances	13,183	15,608	20,838	47,719
Sales and repayments	(146,289)	(129,896)	(269,147)	(1,264,888)
Changes in fair value included in income arising from:
Changes in instrument specific credit risk	10,951	(24,394)	20,494	(30,210)
Other factors	(929)	(8,922)	(136)	(21,318)
Total changes in fair value included in income	10,022	(33,316)	20,358	(51,528)
Transfers from Level 3 to Level 2	(411,179)	(723,995)	(776,893)	(2,089,966)
Transfers to real estate acquired in settlement of loans	(254)	(386)	(306)	(386)
Balance at the end of the period	392,758	503,553	392,758	503,553
Changes in fair value recognized during the period relating to assets still held at the end of the period	5,868	(18,079)	10,646	(28,700)
Interest rate lock commitments
Roll forward of assets measured using Level 3 inputs on a recurring basis
Balance at the beginning of the period	58,846	37,899	25,844	322,193
Purchases and issuances, net	67,878	145,980	130,386	307,289
Changes in fair value included in income arising from:
Other factors	(21,692)	(167,106)	50,720	(566,483)
Total changes in fair value included in income	(21,692)	(167,106)	50,720	(566,483)
Transfers to loans held for sale	(74,396)	48,378	(176,314)	2,152
Balance at the end of the period	30,636	65,151	30,636	65,151
Changes in fair value recognized during the period relating to assets still held at the end of the period	30,636	65,151	30,636	65,151
Mortgage servicing rights
Roll forward of assets measured using Level 3 inputs on a recurring basis
Balance at the beginning of the period	6,003,390	4,707,039	5,953,621	3,878,078
Sales and repayments			(232)
Mortgage servicing rights resulting from loan sales	562,523	398,253	849,056	1,014,555
Changes in fair value included in income arising from:
Other factors	(55,328)	111,875	(291,860)	324,534
Total changes in fair value included in income	(55,328)	111,875	(291,860)	324,534
Balance at the end of the period	6,510,585	5,217,167	6,510,585	5,217,167
Changes in fair value recognized during the period relating to assets still held at the end of the period	$ (55,328)	$ 111,875	$ (291,860)	$ 324,534