Related Party Transactions - Exchanged Private National Mortgage Acceptance Company, LLC Unitholders (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Sep. 30, 2024	Dec. 31, 2023
Transactions with Affiliates
Amount of tax benefits under the tax sharing agreement (as a percent)	85.00%
Payable to exchanged PNMAC unitholders under tax receivable agreement	$ 25,900		$ 25,900	$ 25,900
Interest income	189,871	$ 156,426
Related Party | Private National Mortgage Acceptance Company
Transactions with Affiliates
Payment of tax liability under the tax receivable agreement to Private National Mortgage Acceptance Company, LLC unitholders	$ 0	$ 0