Net Gains on Loans Held for Sale (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Non-cash gain:
Provision for losses relating to representations and warranties on loans sold pursuant to loan sales	$ (4,719)	$ (4,070)	$ (12,320)	$ (12,151)
Provision for losses relating to representations and warranties on loans sold reduction in liability due to change in estimate	2,365	3,481	6,000	10,877
Changes in fair values of loans and derivatives held at end of quarter:
Net gains on loans held for sale at fair value	314,455	256,819	770,151	595,324
Nonrelated Party
Cash losses:
Loans	(258,450)	(108,058)	(1,107,970)	(831,070)
Hedging activities	(26,139)	(274,090)	(442,610)	(31,319)
Cash gain (loss), net of effects of cash hedging, on sale of loans held for sale	(284,589)	(382,148)	(1,550,580)	(862,389)
Non-cash gain:
Mortgage servicing rights resulting from loan sales	700,326	578,982	2,165,213	1,532,709
Provision for losses relating to representations and warranties on loans sold pursuant to loan sales	(4,719)	(4,070)	(12,320)	(12,151)
Provision for losses relating to representations and warranties on loans sold reduction in liability due to change in estimate	2,365	3,481	6,000	10,877
Changes in fair values of loans and derivatives held at end of quarter:
Interest rate lock commitments	(20,563)	49,862	88,025	29,021
Loans	(828)	(48,504)	(103,135)	(23,554)
Hedging derivatives	(94,991)	56,710	147,581	(80,869)
Net gains on loans held for sale at fair value	297,001	254,313	740,784	593,644
Related Party
Changes in fair values of loans and derivatives held at end of quarter:
Net gains on loans held for sale at fair value	17,454	2,506	29,367	1,680
Related Party | PennyMac Mortgage Investment Trust
Changes in fair values of loans and derivatives held at end of quarter:
Net gains on loans held for sale at fair value	$ 17,454	$ 2,506	$ 29,367	$ 1,680