CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net gains on loans held for sale at fair value:
Net gains on loans held for sale at fair value	$ 791,633	$ 2,464,401	$ 2,740,785
Loan origination fees	169,859	384,154	285,551
Fulfillment fees from PennyMac Mortgage Investment Trust	67,991	178,927	222,200
Loan servicing fees
Loan servicing fees	1,228,637	1,075,112	998,291
Change in fair value of mortgage servicing rights and mortgage servicing liabilities	354,176	(415,906)	(1,501,993)
Changes in fair value included in income		(1,037)	24,970
Mortgage servicing rights hedging results	(631,484)	(475,215)	918,180
Change in fair value of excess servicing spread financing payable to PennyMac Mortgage Investment Trust	(277,308)	(892,158)	(558,843)
Net loan servicing fees	951,329	182,954	439,448
Interest income:
Interest income	294,062	300,169	247,026
Interest expense:
Interest expense	335,427	390,699	271,551
Net interest expense	(41,365)	(90,530)	(24,525)
Management fees, net:
Management fees from PennyMac Mortgage Investment Trust	31,065	37,801	34,538
Change in fair value of investment in and dividends received from PennyMac Mortgage Investment Trust	(235)	336	(453)
Result of real estate acquired in settlement of loans	2,510	1,993	1,036
Repricing of payable to exchanged Private National Mortgage Acceptance Company , LLC unitholders	576		280
Other	12,392	7,325	6,737
Total net revenue	1,985,755	3,167,361	3,705,597
Expenses
Compensation	735,231	999,802	738,569
Loan origination	173,622	330,788	219,746
Technology	139,950	141,426	112,570
Professional services	73,270	94,283	64,064
Servicing	59,628	109,835	256,934
Marketing and advertising	46,762	44,806	8,658
Occupancy and equipment	40,124	35,810	33,357
Other	51,921	51,428	31,090
Total expenses	1,320,508	1,808,178	1,464,988
Income before provision for income taxes	665,247	1,359,183	2,240,609
Provision for income taxes	189,740	355,693	593,725
Net income attributable to PennyMac Financial Services, Inc. common stockholders	$ 475,507	$ 1,003,490	$ 1,646,884
Earnings per share
Basic (in dollars per share)	$ 8.96	$ 15.73	$ 21.91
Diluted (in dollars per share)	$ 8.50	$ 14.87	$ 20.92
Weighted-average shares outstanding
Basic (in shares)	53,065	63,799	75,161
Diluted (in shares)	55,950	67,471	78,728
Non-affiliates
Net gains on loans held for sale at fair value:
Net gains on loans held for sale at fair value	$ 808,197	$ 2,515,874	$ 2,690,104
Loan origination fees	161,441	358,028	262,143
Loan servicing fees
Loan servicing fees	1,054,828	875,570	814,646
Interest income:
Interest income	294,062	299,782	243,701
Interest expense:
Interest expense	335,427	389,419	263,133
PennyMac Mortgage Investment Trust
Net gains on loans held for sale at fair value:
Net gains on loans held for sale at fair value	16,564	51,473	(50,681)
Loan origination fees	8,418	26,126	23,408
Loan servicing fees
Loan servicing fees	81,915	80,658	67,181
Interest income:
Interest income		387	3,325
Interest expense:
Interest expense		1,280	8,418
Others
Loan servicing fees
Loan servicing fees	$ 91,894	$ 118,884	$ 116,464