CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net gains on loans held for sale at fair value:
From non-affiliates	$ 768,589	$ 266,366
Net gains on loans held for sale at fair value	754,341	344,282
Loan origination fees from non-affiliates	95,845	53,591
Loan origination fees	104,037	57,571
Loan servicing fees
From non-affiliates	210,753	198,653
Other	29,599	28,755
Loan servicing fees	259,445	241,929
Change in fair value of mortgage servicing rights and mortgage servicing liabilities	(223,463)	1,035,213
Mortgage servicing rights hedging results	(442,151)	1,036,570
Change in fair value of excess servicing spread payable to PennyMac Mortgage Investment Trust	(219,725)	15,879
Net loan servicing fees	39,720	257,808
Interest income:
From non-affiliates	81,694	71,346
Interest income	82,081	72,564
Interest expense:
To non-affiliates	106,433	59,538
Interest expense	107,713	61,512
Net interest (expense) income	(25,632)	11,052
Management fees, net:
Management fees	8,449	9,055
Result of real estate acquired in settlement of loans	780	(707)
Other	1,755	1,681
Total net revenue	944,686	721,825
Expenses
Compensation	258,829	168,436
Loan origination	87,392	46,004
Technology	33,672	19,107
Servicing	19,183	42,166
Professional services	13,286	13,404
Occupancy and equipment	9,038	8,038
Other	17,278	9,940
Total expenses	438,678	307,095
Income before provision for income taxes	506,008	414,730
Provision for income taxes	129,140	108,487
Net income	376,868	306,243
Net income attributable to PennyMac Financial Services, Inc. common stockholders	$ 376,868	$ 306,243
Earnings per share
Basic (in dollars per share)	$ 5.45	$ 3.89
Diluted (in dollars per share)	$ 5.15	$ 3.73
Weighted-average shares outstanding
Basic (in shares)	69,113	78,689
Diluted (in shares)	73,117	82,008
Dividend declared per share (in dollars per share)	$ 0.20	$ 0.12
PMT
Net gains on loans held for sale at fair value:
From PennyMac Mortgage Investment Trust	$ (14,248)	$ 77,916
Loan origination fees from PennyMac Mortgage Investment Trust	8,192	3,980
Fulfillment fees from PennyMac Mortgage Investment Trust	60,835	41,940
Loan servicing fees
Loan servicing fees from affiliates	19,093	14,521
Changes in fair value included in income	(1,037)	14,522
Interest income:
From PennyMac Mortgage Investment Trust	387	1,218
Interest expense:
To PennyMac Mortgage Investment Trust	1,280	1,974
Management fees, net:
Management fees	8,449	9,055
Change in fair value of investment in and dividends received from affiliate	$ 401	$ (857)