Mortgage Servicing Rights and Mortgage Servicing Liabilities - Activity in MSRs at Fair Value (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Change in fair value due to:
Total change in fair value	$ 236,447	$ (212,911)
Mortgage servicing rights
Activity in MSRs carried at fair value
Balance at beginning of period	5,953,621	3,878,078
Additions - Resulting from loan sales	286,533	616,302
Additions	286,301	616,302
Sales	(232)
Change in fair value due to:
Changes in valuation inputs used in valuation model	(90,279)	323,928
Other changes in fair value	(146,253)	(111,269)
Total change in fair value	(236,532)	212,659
Balance at end of period	6,003,390	4,707,039
UPB of underlying loan at end of period	321,263,982	$ 290,760,440
Asset Pledged as Collateral without Right | Mortgage servicing rights
Activity in MSRs carried at fair value
Balance at beginning of period	5,897,613
Change in fair value due to:
Balance at end of period	$ 5,954,749
Assets, Pledging Purpose [Extensible Enumeration]	Notes Payable		Notes Payable