CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net gains on loans held for sale at fair value:
From non-affiliates	$ 687,765	$ 111,222	$ 954,131	$ 169,975
Net gains on loans held for sale at fair value	682,173	147,533	1,026,455	232,309
Loan origination fees from non-affiliates	54,660	33,822	108,251	55,509
Loan origination fees	58,948	36,924	116,519	60,854
Fulfillment fees from PennyMac Mortgage Investment Trust			94,755	57,164
Loan servicing fees
From non-affiliates	199,178	180,753	397,831	347,543
Other	28,543	26,008	57,298	48,025
Loan servicing fees	243,254	218,329	485,183	417,706
Change in fair value of mortgage servicing rights and mortgage servicing liabilities	205,789	365,979	1,241,002	623,393
Hedging results	(15,764)	203,180	1,020,806	337,737
Change in fair value of excess servicing spread payable to PennyMac Mortgage Investment Trust	(220,917)	(159,195)	(205,038)	(278,001)
Net loan servicing fees	22,337	59,134	280,145	139,705
Interest income:
From non-affiliates	46,526	69,208	117,872	125,745
Interest income	47,318	70,900	119,882	129,233
Interest expense:
To non-affiliates	50,835	50,157	110,373	84,634
Interest expense	53,207	52,924	114,719	90,467
Net interest (expense) income	(5,889)	17,976	5,163	38,766
Management fees, net:
Management fees	8,288	8,832	17,343	16,080
Result of real estate acquired in settlement of loans	296	743	(411)	1,017
Other	2,123	2,126	3,804	4,476
Total net revenue	821,634	302,977	1,543,459	550,682
Expenses
Compensation	179,886	114,717	348,322	221,317
Servicing	56,503	29,008	98,669	59,301
Loan origination	50,921	23,071	96,925	37,568
Technology	21,905	16,080	41,012	32,046
Professional services	12,500	6,313	25,904	12,194
Occupancy and equipment	8,293	7,042	16,331	13,818
Other	11,264	7,156	21,204	14,557
Total expenses	341,272	203,387	648,367	390,801
Income before provision for income taxes	480,362	99,590	895,092	159,881
Provision for income taxes	127,685	26,894	236,172	41,050
Net income attributable to PennyMac Financial Services, Inc. common stockholders	$ 352,677	$ 72,696	$ 658,920	$ 118,831
Earnings per share
Basic (in dollars per share)	$ 4.53	$ 0.93	$ 8.42	$ 1.52
Diluted (in dollars per share)	$ 4.39	$ 0.92	$ 8.11	$ 1.50
Weighted-average shares outstanding
Basic (in shares)	77,790	78,335	78,240	77,996
Diluted (in shares)	80,424	79,318	81,241	79,301
Dividend declared per share (in dollars per share)	$ 0.12		$ 0.24
PMT
Net gains on loans held for sale at fair value:
From PennyMac Mortgage Investment Trust	$ (5,592)	$ 36,311	$ 72,324	$ 62,334
Loan origination fees from PennyMac Mortgage Investment Trust	4,288	3,102	8,268	5,345
Fulfillment fees from PennyMac Mortgage Investment Trust	52,815	29,590	94,755	57,164
Loan servicing fees
Loan servicing fees from affiliates	15,533	11,568	30,054	22,138
Changes in fair value included in income	636	3,604	15,158	7,655
Interest income:
From PennyMac Mortgage Investment Trust	792	1,692	2,010	3,488
Interest expense:
To PennyMac Mortgage Investment Trust	2,372	2,767	4,346	5,833
Management fees, net:
Management fees	8,288	8,832	17,343	16,080
Change in fair value of investment in and dividends received from affiliate	$ 543	$ 119	$ (314)	$ 311