Short-Term Debt - Assets Sold Under Agreement to Repurchase (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Carrying value:
Unpaid principal balance	$ 10,183,904
Total loans sold under agreements to repurchase	10,177,643		$ 8,794,002
Loans held for sale	9,954,495		9,123,410
Servicing advances, net	622,890		589,542
Mortgage servicing rights, at fair value	10,149,036		9,598,941
Other Assets	$ 1,009,168		1,026,913
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]	us-gaap:SecuredOvernightFinancingRateSofrMember
Loan Repo Facility
During the period:
Average balance of assets sold under agreements to repurchase	$ 7,971,975	$ 6,109,683
Weighted-average interest rate	5.28%	5.94%
Total interest expense	$ 110,018	$ 94,229
Maximum daily amount outstanding	10,183,904	8,589,915
Carrying value:
Unpaid principal balance	10,183,904		8,801,215
Unamortized debt issuance costs	(6,261)		(7,213)
Total loans sold under agreements to repurchase	$ 10,177,643		$ 8,794,002
Weighted average interest rate	5.18%		5.18%
Available borrowing capacity committed	$ 1,193,285		$ 1,486,344
Available borrowing capacity uncommitted	3,480,243		3,367,758
Available borrowing capacity	4,673,528		4,854,102
Amortization of debt issuance costs	6,200	$ 4,800
Asset Pledged as Collateral without Right
Carrying value:
Loans held for sale	9,799,780		8,983,503
Servicing advances, net	$ 394,107		$ 406,825
Assets, Pledging Purpose [Extensible Enumeration]	Notes Payable		Notes Payable
Mortgage servicing rights, at fair value	$ 9,901,292		$ 9,367,851
Other Assets	$ 15,241		$ 10,393
Asset Pledged as Collateral without Right \| Mortgage servicing rights
Carrying value:
Assets, Pledging Purpose [Extensible Enumeration]	Notes Payable		Notes Payable
Asset Pledged as Collateral without Right \| Loan Repo Facility \| Principal-only stripped MBS
Carrying value:
Principal-only stripped MBS	$ 659,235		$ 722,528
Asset Pledged as Collateral without Right \| Loan Repo Facility \| Servicing advances
Carrying value:
Servicing advances, net	394,107		406,825
Asset Pledged as Collateral without Right \| Loan Repo Facility \| Mortgage servicing rights
Carrying value:
Mortgage servicing rights, at fair value	9,425,085		7,968,105
Asset Pledged as Collateral without Right \| Mortgage loans held for sale \| Loan Repo Facility \| Loans held for sale
Carrying value:
Loans held for sale	9,067,257		8,245,256
Asset Pledged as Collateral without Right \| Deposits.
Carrying value:
Other Assets	15,241		10,393
Asset Pledged as Collateral without Right \| Deposits. \| Margin deposits
Carrying value:
Other Assets	12,630		10,393
Asset Pledged as Collateral without Right \| Deposits. \| Loan Repo Facility \| Margin deposits
Carrying value:
Other Assets	$ 15,241		$ 10,393

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