Transactions with Related Parties - Exchanged Private National Mortgage Acceptance Company, LLC Unitholders (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Transactions with Affiliates
Amount of tax benefits under the tax sharing agreement (as a percent)	85.00%
Payments to exchanged Private National Mortgage Acceptance Company, LLC unitholders under tax receivable agreement			$ (3,855)
Repricing of payable to exchanged Private National Mortgage Acceptance Company, LLC unitholders under tax receivable agreement	$ (201)		(576)
Interest income	793,566	$ 632,924	294,062
Related Party | Private National Mortgage Acceptance Company
Transactions with Affiliates
Payments to exchanged Private National Mortgage Acceptance Company, LLC unitholders under tax receivable agreement			3,855
Repricing of payable to exchanged Private National Mortgage Acceptance Company, LLC unitholders under tax receivable agreement	(201)		(576)
Payable to exchanged PNMAC unitholders under tax receivable agreement	25,898	26,099	26,099
Related Party | Related Party Donor Advised Fund
Transactions with Affiliates
Charitable contributions	$ 2,500	$ 0	$ 0