Net Gains on Loans Held for Sale (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Cash loss:
Loans	$ 502,416	$ (13,579)	$ 614,173	$ (54,821)
Hedging activities	(227,013)	(73,145)	(349,679)	(82,072)
Cash gain (loss), net of effects of cash hedging, on sale of loans held for sale	275,403	(86,724)	264,494	(136,893)
Non-cash gain:
Mortgage servicing rights and mortgage servicing liabilities resulting from loan sales	225,534	176,493	501,273	291,450
Provision for losses relating to representations and warranties on loans sold pursuant to loan sales	(4,189)	(1,647)	(7,901)	(2,714)
Provision for losses relating to representations and warranties on loans sold reduction in liability due to change in estimate	1,270	920	2,946	5,130
Change in fair value of loans and derivatives held at period end:
Interest rate lock commitments	52,871	45,711	231,414	62,438
Loans	10,978	(29,522)	(61,102)	(29,686)
Hedging derivatives	125,898	5,991	23,007	(19,750)
From non-affiliates	687,765	111,222	954,131	169,975
Recapture payable to PennyMac Mortgage Investment Trust	(5,592)	36,311	72,324	62,334
Net gains on loans held for sale at fair value	$ 682,173	$ 147,533	$ 1,026,455	$ 232,309