Net Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Interest income:
Interest income	$ 49,864	$ 80,797	$ 103,746	$ 162,878
Interest expense:
Obligations under capital lease	5	48	20	107
Interest expense	71,127	102,431	148,434	210,144
Net interest expense	(21,263)	(21,634)	(44,688)	(47,266)
PennyMac Mortgage Investment Trust
Interest income:
Interest income				387
Interest expense:
Interest expense				1,280
Non-affiliates
Interest income:
Cash and short-term investments	405	747	977	1,734
Loans held for sale at fair value	36,777	76,453	85,890	151,277
Placement fees relating to custodial funds	12,682	3,597	16,879	9,480
Interest income	49,864	80,797	103,746	162,491
Interest expense:
Assets sold under agreements to repurchase	18,949	44,623	42,719	96,802
Mortgage loan participation purchase and sale agreements	1,377	1,039	2,497	2,134
Obligations under capital lease	5	48	20	107
Notes payable	13,656	10,104	23,565	19,992
Unsecured senior notes	23,688	16,169	47,116	28,839
Interest shortfall on repayments of mortgage loans serviced for Agency securitizations	12,286	29,144	29,765	58,580
Interest on mortgage loan impound deposits	1,166	1,304	2,752	2,410
Interest expense	71,127	102,431	148,434	208,864
Loan Repo Facility
Interest expense:
Assets sold under agreements to repurchase	$ 18,949	$ 44,623	$ 42,719	$ 96,802