Fair Value - Level 3 Input Roll Forward, Recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 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)
Recurring basis
Roll forward of assets measured using Level 3 inputs on a recurring basis
Balance at the beginning of the quarter	$ 7,667,505	$ 6,325,237
Purchases and issuances, net	1,006,131	500,158
Capitalization of interest and advances	11,226	7,655
Sales and repayments	(383,999)	(123,090)
Mortgage servicing rights resulting from loan sales	412,520	286,533
Changes in fair value included in income arising from:
Changes in instrument specific credit risk	17,142	9,543
Other factors	(17,706)	(163,327)
Total changes in fair value included in income	(564)	(153,784)
Transfers from Level 3 to Level 2	(561,829)	(365,714)
Transfers to real estate acquired in settlement of loans		(52)
Transfers to loans held for sale	(131,580)	(101,918)
Balance at the end of the quarter	8,019,410	6,375,025
Changes in fair value recognized during the period relating to assets still held at the end of the quarter	60,193	(169,273)
Roll forward of liabilities measured using Level 3 inputs on a recurring basis
Balance at the beginning of the quarter	1,805	2,096
Changes in fair value included in income	(73)	(85)
Balance at the end of the quarter	1,732	2,011
Changes in fair value recognized during the period relating to liability still outstanding at the end of the quarter	(73)	(85)
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	478,564	345,772
Purchases and issuances, net	905,860	437,650
Capitalization of interest and advances	11,226	7,655
Sales and repayments	(383,999)	(122,858)
Changes in fair value included in income arising from:
Changes in instrument specific credit risk	17,142	9,543
Other factors	(572)	793
Total changes in fair value included in income	16,570	10,336
Transfers from Level 3 to Level 2	(561,829)	(365,714)
Transfers to real estate acquired in settlement of loans		(52)
Balance at the end of the quarter	466,392	312,789
Changes in fair value recognized during the period relating to assets still held at the end of the quarter	19,043	8,413
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	89,593	25,844
Purchases and issuances, net	100,271	62,508
Changes in fair value included in income arising from:
Other factors	11,524	72,412
Total changes in fair value included in income	11,524	72,412
Transfers to loans held for sale	(131,580)	(101,918)
Balance at the end of the quarter	69,808	58,846
Changes in fair value recognized during the period relating to assets still held at the end of the quarter	69,808	58,846
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	7,099,348	5,953,621
Sales and repayments		(232)
Mortgage servicing rights resulting from loan sales	412,520	286,533
Changes in fair value included in income arising from:
Other factors	(28,658)	(236,532)
Total changes in fair value included in income	(28,658)	(236,532)
Balance at the end of the quarter	7,483,210	6,003,390
Changes in fair value recognized during the period relating to assets still held at the end of the quarter	$ (28,658)	$ (236,532)