CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net gains on loans held for sale at fair value:
Net gains on loans held for sale at fair value	$ 222,567	$ 582,648	$ 521,026	$ 1,336,989
Loan origination fees	39,945	97,291	107,803	201,328
Fulfillment fees from PennyMac Mortgage Investment Trust	20,646	54,020	37,400	114,855
Loan servicing fees
Loan servicing fees	302,350	260,021	593,608	519,466
Change in fair value of mortgage servicing rights and mortgage servicing liabilities	112,102	(336,268)	325,013	(112,805)
Changes in fair value included in income				(1,037)
Mortgage servicing rights hedging results	(176,005)	91,118	(393,865)	(351,033)
Change in fair value of excess servicing spread financing payable to PennyMac Mortgage Investment Trust	(63,903)	(245,150)	(68,852)	(464,875)
Net loan servicing fees	238,447	14,871	524,756	54,591
Interest income:
Interest income	49,864	80,797	103,746	162,878
Interest expense:
Interest expense	71,127	102,431	148,434	210,144
Net interest expense	(21,263)	(21,634)	(44,688)	(47,266)
Management fees, net:
Management fees from PennyMac Mortgage Investment Trust	7,910	11,913	16,027	20,362
Change in fair value of investment in and dividends received from PennyMac Mortgage Investment Trust	(194)	144	(192)	545
Result of real estate acquired in settlement of loans	810	540	1,353	1,320
Other	2,647	2,459	5,534	4,214
Total net revenue	511,515	742,252	1,169,019	1,686,938
Expenses
Compensation	198,192	265,067	443,739	523,896
Loan origination	44,931	75,675	120,264	163,067
Technology	34,621	34,236	69,407	67,908
Professional services	20,793	24,834	40,896	38,120
Marketing and advertising	13,007	10,213	35,410	16,878
Occupancy and equipment	9,371	9,029	18,840	18,067
Servicing	3,051	31,290	1,805	50,473
Other	10,023	12,393	26,612	23,006
Total expenses	333,989	462,737	756,973	901,415
Income before provision for income taxes	177,526	279,515	412,046	785,523
Provision for income taxes	48,363	75,286	109,290	204,426
Net income attributable to PennyMac Financial Services, Inc. common stockholders	$ 129,163	$ 204,229	$ 302,756	$ 581,097
Earnings per share
Basic (in dollars per share)	$ 2.38	$ 3.10	$ 5.51	$ 8.61
Diluted (in dollars per share)	$ 2.28	$ 2.94	$ 5.23	$ 8.16
Weighted-average shares outstanding
Basic (in shares)	54,167	65,890	54,995	67,493
Diluted (in shares)	56,642	69,399	57,892	71,248
Non-affiliates
Net gains on loans held for sale at fair value:
Net gains on loans held for sale at fair value	$ 227,319	$ 594,196	$ 535,430	$ 1,362,785
Loan origination fees	37,541	90,163	103,057	186,008
Loan servicing fees
Loan servicing fees	259,338	208,275	504,147	419,028
Interest income:
Interest income	49,864	80,797	103,746	162,491
Interest expense:
Interest expense	71,127	102,431	148,434	208,864
PennyMac Mortgage Investment Trust
Net gains on loans held for sale at fair value:
Net gains on loans held for sale at fair value	(4,752)	(11,548)	(14,404)	(25,796)
Loan origination fees	2,404	7,128	4,746	15,320
Loan servicing fees
Loan servicing fees	20,335	20,015	41,423	39,108
Interest income:
Interest income				387
Interest expense:
Interest expense				1,280
Others
Loan servicing fees
Loan servicing fees	$ 22,677	$ 31,731	$ 48,038	$ 61,330