Net Gains on Loans Held for Sale (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Cash loss:
Loans	$ (22,838)	$ (107,414)	$ (77,659)	$ (399,457)
Hedging activities	(148,128)	(2,507)	(230,200)	89,322
Cash gain (loss), net of effects of cash hedging, on sale of loans held for sale	(170,966)	(109,921)	(307,859)	(310,135)
Non-cash gain:
Mortgage servicing rights and mortgage servicing liabilities resulting from loan sales	227,256	147,259	518,706	443,056
Provision for losses relating to representations and warranties on loans sold pursuant to loan sales	(2,508)	(1,842)	(5,222)	(4,550)
Provision for losses relating to representations and warranties on loans sold reduction in liability due to change in estimate	1,175	1,155	6,305	3,627
Change in fair value relating to loans and derivatives held at year end:
Interest rate lock commitments	33,347	(18,526)	95,785	(21,109)
Loans	(5,822)	6,897	(35,508)	21,407
Hedging derivatives	92,588	13,327	72,838	11,100
From non-affiliates	175,070	38,349	345,045	143,396
Recapture payable to PennyMac Mortgage Investment Trust	60,662	18,565	122,996	45,878
Net gains on loans held for sale at fair value	$ 235,732	$ 56,914	$ 468,041	$ 189,274