Related Party Transactions - Exchanged Private National Mortgage Acceptance Company, LLC Unitholders (Details) - USD ($)		3 Months Ended		6 Months Ended
	Dec. 27, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	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					$ (3,516,000)
Payable to exchanged PNMAC unitholders under tax receivable agreement		$ 26,100,000		$ 26,100,000		$ 26,100,000
Interest income		172,952,000	$ 49,864,000	301,430,000	103,746,000
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	$ 3,500,000	0	$ 3,500,000
Related Party | Townsgate Closing Services, LLC
Transactions with Affiliates
Advances to related party	$ 801,000
Maximum commitment amount	$ 1,500,000
Advances stated percentage	10.75%
Advances variable rate	10+ year USD High Yield Corporate Bond Index
Interest income		$ 21,000		$ 42,000