Net Interest Income (Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Interest income:
Interest income	$ 82,994	$ 68,312	$ 186,740	$ 231,190
Interest expense:
Obligations under capital lease		36	20	143
Interest expense	82,965	90,711	231,399	300,855
Net interest income (expense)	29	(22,399)	(44,659)	(69,665)
PennyMac Mortgage Investment Trust
Interest income:
Interest income				387
Interest expense:
Interest expense				1,280
Non-affiliates
Interest income:
Cash and short-term investments	7,759	768	8,736	2,502
Loans held for sale at fair value	38,945	63,726	124,835	215,003
Placement fees relating to custodial funds	36,290	3,818	53,169	13,298
Interest income	82,994	68,312	186,740	230,803
Interest expense:
Assets sold under agreements to repurchase	24,329	35,783	67,048	132,585
Mortgage loan participation purchase and sale agreements	2,073	1,026	4,570	3,160
Obligations under capital lease		36	20	143
Notes payable	24,795	9,896	48,360	29,888
Unsecured senior notes	23,949	17,442	71,065	46,281
Interest shortfall on repayments of mortgage loans serviced for Agency securitizations	5,620	24,886	35,385	83,466
Interest on mortgage loan impound deposits	2,199	1,642	4,951	4,052
Interest expense	82,965	90,711	231,399	299,575
Loan Repo Facility
Interest expense:
Assets sold under agreements to repurchase	$ 24,329	$ 35,783	$ 67,048	$ 132,585