CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Net gains on loans held for sale at fair value:
Net gains on loans held for sale at fair value	$ 234,659	$ 176,064	$ 455,696	$ 338,505
Loan origination fees	59,091	42,075	105,702	78,446
Fulfillment fees from PennyMac Mortgage Investment Trust	5,814	4,427	11,104	8,443
Loan servicing fees:
Servicing fees	506,667	440,696	995,135	864,880
Change in fair value of mortgage servicing rights and mortgage servicing liabilities	(247,170)	(101,315)	(678,126)	(129,900)
Mortgage servicing rights hedging results	(109,102)	(171,777)	(2,328)	(466,422)
Change in fair value of mortgage servicing rights and mortgage-backed securities	(356,272)	(273,092)	(680,454)	(596,322)
Net loan servicing fees	150,395	167,604	314,681	268,558
Management fees from PennyMac Mortgage Investment Trust	6,869	7,133	13,881	14,321
Net interest expense:
Interest income	221,929	200,811	411,800	357,237
Interest expense	239,577	207,871	447,659	373,640
Net interest expense	(17,648)	(7,060)	(35,859)	(16,403)
Change in fair value of investment in and dividends received from PennyMac Mortgage Investment Trust	(105)	(40)	80	(30)
Results of real estate acquired in settlement of loans	47	193	(178)	599
Repricing of payable to exchanged Private National Mortgage Acceptance Company , LLC unitholders under tax receivable agreement	1,092		1,092
Other	4,516	15,731	9,434	19,348
Total net revenues	444,730	406,127	875,633	711,787
Expenses
Compensation	187,541	141,956	369,529	288,332
Loan origination	68,836	40,270	112,932	70,838
Technology	42,257	35,690	82,454	71,657
Servicing	28,286	22,920	50,161	39,024
Marketing and advertising	12,389	5,445	21,821	9,116
Professional services	8,380	9,404	17,417	18,666
Occupancy and equipment	8,379	7,893	16,761	16,569
Other	12,220	8,695	23,920	19,848
Total expenses	368,288	272,273	694,995	534,050
Income before (benefit from) provision for income taxes	76,442	133,854	180,638	177,737
(Benefit from) provision for income taxes	(60,021)	35,596	(32,105)	40,171
Net income	$ 136,463	$ 98,258	$ 212,743	$ 137,566
Earnings per share
Basic (in dollars per share)	$ 2.64	$ 1.93	$ 4.12	$ 2.71
Diluted (in dollars per share)	$ 2.54	$ 1.85	$ 3.97	$ 2.59
Weighted-average shares outstanding
Basic (in shares)	51,667	50,955	51,587	50,751
Diluted (in shares)	53,635	53,204	53,626	53,140
Related Party
Net gains on loans held for sale at fair value:
Net gains on loans held for sale at fair value	$ 7,075	$ (473)	$ 11,913	$ (826)
Loan origination fees	502	431	979	790
Nonrelated Party
Net gains on loans held for sale at fair value:
Net gains on loans held for sale at fair value	227,584	176,537	443,783	339,331
Loan origination fees	58,589	41,644	104,723	77,656
Net interest expense:
Interest expense	239,577	207,871	447,659	373,640
Non-affiliates | Nonrelated Party
Loan servicing fees:
Servicing fees	435,517	375,040	853,204	733,066
PennyMac Mortgage Investment Trust | Related Party
Net gains on loans held for sale at fair value:
Net gains on loans held for sale at fair value	7,075	(473)	11,913	(826)
Loan servicing fees:
Servicing fees	21,645	20,264	43,374	40,526
Net interest expense:
Change in fair value of investment in and dividends received from PennyMac Mortgage Investment Trust	(105)	(40)	80	(30)
Others | Nonrelated Party
Loan servicing fees:
Servicing fees	$ 49,505	$ 45,392	$ 98,557	$ 91,288