Mortgage Servicing Rights and Mortgage Servicing Liabilities - Activity in MSRs at Fair Value (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Change in fair value due to:
Total change in fair value	$ (354,176)	$ 415,906	$ 1,501,993
Mortgage servicing rights
Activity in MSRs carried at fair value
Balance at beginning of period	3,878,078	2,581,174	2,926,790
Additions - Resulting from loan sales	1,718,094	1,861,949	1,138,045
Additions - Purchases (purchase adjustments)	3,993		25,473
Additions	1,722,087	1,861,949	1,163,518
Change in fair value due to:
Changes in valuation inputs used in valuation model	877,324	(136,350)	(1,078,084)
Other changes in fair value	(523,868)	(428,695)	(431,050)
Total change in fair value	353,456	(565,045)	(1,509,134)
Balance at end of period	5,953,621	3,878,078	2,581,174
UPB of underlying loan at end of period	$ 314,567,639	$ 278,324,780	$ 238,410,809
Asset Pledged as Collateral without Right
Change in fair value due to:
Assets, Pledging Purpose [Extensible Enumeration]	Notes Payable	Notes Payable
Asset Pledged as Collateral without Right | Mortgage servicing rights
Activity in MSRs carried at fair value
Balance at beginning of period	$ 3,856,791
Change in fair value due to:
Balance at end of period	$ 5,897,613	$ 3,856,791
Assets, Pledging Purpose [Extensible Enumeration]	Notes Payable	Notes Payable