CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Net gains on loans held for sale at fair value:
Net gains on loans held for sale at fair value	$ 256,819	$ 151,374	$ 595,324	$ 397,178
Loan origination fees	49,430	37,701	127,876	108,059
Fulfillment fees from PennyMac Mortgage Investment Trust	11,492	5,531	19,935	22,895
Loan servicing fees:
Loan servicing fees	462,037	387,934	1,326,917	1,082,462
Change in fair value of mortgage servicing rights and mortgage servicing liabilities	(628,258)	221,096	(758,158)	(70,608)
Mortgage servicing rights hedging results	242,051	(423,656)	(224,371)	(531,565)
Change in fair value of mortgage servicing rights and mortgage-backed securities	(386,207)	(202,560)	(982,529)	(602,173)
Net loan servicing fees	75,830	185,374	344,388	480,289
Management fees from PennyMac Mortgage Investment Trust	7,153	7,175	21,474	21,510
Net interest income (expense):
Interest income	225,470	166,552	582,707	467,982
Interest expense	217,597	156,863	591,237	467,276
Net interest income (expense)	7,873	9,689	(8,530)	706
Change in fair value of investment in and dividends received from PennyMac Mortgage Investment Trust	68	(51)	38	91
Results of real estate acquired in settlement of loans	(269)	637	330	978
Other	3,438	2,878	22,786	8,011
Total net revenues	411,834	400,308	1,123,621	1,039,717
Expenses
Compensation	171,316	156,909	459,648	441,826
Loan origination	45,208	28,889	116,046	87,621
Technology	37,059	39,000	108,716	110,282
Servicing	28,885	13,242	67,909	40,526
Professional services	9,339	11,942	28,005	50,837
Occupancy and equipment	8,156	8,900	24,725	27,786
Marketing and advertising	5,088	4,632	14,204	13,451
Other	12,858	9,997	32,706	29,527
Total expenses	317,909	273,511	851,959	801,856
Income before provision for income taxes	93,925	126,797	271,662	237,861
Provision for income taxes	24,557	33,927	64,728	56,363
Net income	$ 69,368	$ 92,870	$ 206,934	$ 181,498
Earnings per share
Basic (in dollars per share)	$ 1.36	$ 1.86	$ 4.07	$ 3.63
Diluted (in dollars per share)	$ 1.30	$ 1.77	$ 3.88	$ 3.44
Weighted-average shares outstanding
Basic (in shares)	51,180	49,902	50,895	49,975
Diluted (in shares)	53,495	52,561	53,274	52,735
Related Party
Net gains on loans held for sale at fair value:
Net gains on loans held for sale at fair value	$ 2,506	$ (500)	$ 1,680	$ (1,494)
Loan origination fees	1,107	579	1,897	2,690
Nonrelated Party
Net gains on loans held for sale at fair value:
Net gains on loans held for sale at fair value	254,313	151,874	593,644	398,672
Loan origination fees	48,323	37,122	125,979	105,369
Net interest income (expense):
Interest expense	217,597	156,863	591,237	467,276
Non-affiliates | Nonrelated Party
Loan servicing fees:
Loan servicing fees	393,457	328,049	1,126,523	925,865
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	256,819	151,374	595,324	397,178
Loan servicing fees:
Loan servicing fees	22,240	20,257	62,766	61,023
Net interest income (expense):
Change in fair value of investment in and dividends received from PennyMac Mortgage Investment Trust	68	(51)	38	91
Others | Nonrelated Party
Loan servicing fees:
Loan servicing fees	$ 46,340	$ 39,628	$ 137,628	$ 95,574