CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net gains on loans held for sale at fair value:
From non-affiliates	$ 594,196	$ 687,765	$ 1,362,785	$ 954,131
Net gains on loans held for sale at fair value	582,648	682,173	1,336,989	1,026,455
Loan origination fees from non-affiliates	90,163	54,660	186,008	108,251
Loan origination fees	97,291	58,948	201,328	116,519
Fulfillment fees from PennyMac Mortgage Investment Trust			114,855	94,755
Loan servicing fees
From non-affiliates	208,275	199,178	419,028	397,831
Other	31,731	28,543	61,330	57,298
Loan servicing fees	260,021	243,254	519,466	485,183
Change in fair value of mortgage servicing rights and mortgage servicing liabilities	336,268	205,789	112,805	1,241,002
Mortgage servicing rights hedging results	91,118	(15,764)	(351,033)	1,020,806
Change in fair value of excess servicing spread payable to PennyMac Mortgage Investment Trust	(245,150)	(220,917)	(464,875)	(205,038)
Net loan servicing fees	14,871	22,337	54,591	280,145
Interest income:
From non-affiliates	80,797	46,526	162,491	117,872
Interest income	80,797	47,318	162,878	119,882
Interest expense:
To non-affiliates	102,431	50,835	208,864	110,373
Interest expense	102,431	53,207	210,144	114,719
Net interest (expense) income	(21,634)	(5,889)	(47,266)	5,163
Management fees, net:
Management fees	11,913	8,288	20,362	17,343
Result of real estate acquired in settlement of loans	540	296	1,320	(411)
Other	2,459	2,123	4,214	3,804
Total net revenue	742,252	821,634	1,686,938	1,543,459
Expenses
Compensation	265,067	179,886	523,896	348,322
Loan origination	75,675	50,921	163,067	96,925
Technology	34,236	21,905	67,908	41,012
Servicing	31,290	56,503	50,473	98,669
Professional services	24,834	12,500	38,120	25,904
Occupancy and equipment	9,029	8,293	18,067	16,331
Other	22,606	11,264	39,884	21,204
Total expenses	462,737	341,272	901,415	648,367
Income before provision for income taxes	279,515	480,362	785,523	895,092
Provision for income taxes	75,286	127,685	204,426	236,172
Net income			581,097	658,920
Net income attributable to PennyMac Financial Services, Inc. common stockholders	$ 204,229	$ 352,677	$ 581,097	$ 658,920
Earnings per share
Basic (in dollars per share)	$ 3.10	$ 4.53	$ 8.61	$ 8.42
Diluted (in dollars per share)	$ 2.94	$ 4.39	$ 8.16	$ 8.11
Weighted-average shares outstanding
Basic (in shares)	65,890	77,790	67,493	78,240
Diluted (in shares)	69,399	80,424	71,248	81,241
Dividend declared per share (in dollars per share)	$ 0.20	$ 0.12	$ 0.40	$ 0.24
PMT
Net gains on loans held for sale at fair value:
From PennyMac Mortgage Investment Trust	$ (11,548)	$ (5,592)	$ (25,796)	$ 72,324
Loan origination fees from PennyMac Mortgage Investment Trust	7,128	4,288	15,320	8,268
Fulfillment fees from PennyMac Mortgage Investment Trust	54,020	52,815	114,855	94,755
Loan servicing fees
Loan servicing fees from affiliates	20,015	15,533	39,108	30,054
Changes in fair value included in income		636	(1,037)	15,158
Interest income:
From PennyMac Mortgage Investment Trust		792	387	2,010
Interest expense:
To PennyMac Mortgage Investment Trust		2,372	1,280	4,346
Management fees, net:
Management fees	11,913	8,288	20,362	17,343
Change in fair value of investment in and dividends received from affiliate	$ 144	$ 543	$ 545	$ (314)