Transactions with Related Parties - Exchanged Private National Mortgage Acceptance Company, LLC Unitholders (Details) - USD ($)		12 Months Ended
	Dec. 27, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
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			$ (3,855,000)	$ (4,635,000)
Repricing of payable to exchanged Private National Mortgage Acceptance Company, LLC unitholders under tax receivable agreement			(576,000)
Interest income		$ 632,924,000	294,062,000	300,169,000
Related Party | Private National Mortgage Acceptance Company
Transactions with Affiliates
Payments to exchanged Private National Mortgage Acceptance Company, LLC unitholders under tax receivable agreement			3,855,000	4,635,000
Repricing of payable to exchanged Private National Mortgage Acceptance Company, LLC unitholders under tax receivable agreement			(576,000)
Payable to exchanged PNMAC unitholders under tax receivable agreement		26,099,000	26,099,000	30,530,000
Related Party | Related Party Donor Advised Fund
Transactions with Affiliates
Charitable contributions		$ 0	$ 0	$ 5,800,000
Related Party | Townsgate Closing Services, LLC
Transactions with Affiliates
Advances to related party	$ 801,000,000
Maximum commitment amount	$ 1,500,000
Advances stated percentage		10.13%
Advances variable rate	10+ year USD High Yield Corporate Bond Index
Interest income		$ 84,000