Net Gains on Loans Held for Sale (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Cash losses:
Cash gain (loss), net of effects of cash hedging, on sale of loans held for sale	$ (382,148)	$ (251,245)	$ (862,389)	$ (830,968)
Non-cash gain:
Provision for losses relating to representations and warranties on loans sold pursuant to loan sales	(4,070)	(4,011)	(12,151)	(8,885)
Provision for losses relating to representations and warranties on loans sold reduction in liability due to change in estimate	3,481	2,552	10,877	6,005
Changes in fair values of loans and derivatives held at end of quarter:
Net gains on loans held for sale at fair value	256,819	151,374	595,324	397,178
Nonrelated Party
Cash losses:
Loans	(108,058)	(471,830)	(831,070)	(1,136,101)
Hedging activities	(274,090)	220,585	(31,319)	305,133
Non-cash gain:
Mortgage servicing rights resulting from loan sales	578,982	450,936	1,532,709	1,299,992
Provision for losses relating to representations and warranties on loans sold pursuant to loan sales	(4,070)	(4,011)	(12,151)	(8,885)
Provision for losses relating to representations and warranties on loans sold reduction in liability due to change in estimate	3,481	2,552	10,877	6,005
Changes in fair values of loans and derivatives held at end of quarter:
Interest rate lock commitments	49,862	(9,862)	29,021	(5,069)
Loans	(48,504)	22,083	(23,554)	24,762
Hedging derivatives	56,710	(58,579)	(80,869)	(87,165)
Net gains on loans held for sale at fair value	254,313	151,874	593,644	398,672
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	2,506	(500)	1,680	(1,494)
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	$ 256,819	$ 151,374	$ 595,324	$ 397,178