CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net gains on loans held for sale at fair value:
From non-affiliates	$ 865,044	$ 175,070	$ 1,819,175	$ 345,045
Net gains on loans held for sale at fair value	855,269	235,732	1,881,724	468,041
Loan origination fees from non-affiliates	69,496	45,212	177,747	100,721
Loan origination fees	75,572	49,434	192,091	110,288
Fulfillment fees from PennyMac Mortgage Investment Trust			149,594	102,313
Loan servicing fees
From non-affiliates	203,696	185,967	601,527	533,510
Other	27,920	26,018	85,218	74,043
Loan servicing fees	250,368	224,949	735,551	642,655
Change in fair value of mortgage servicing rights and mortgage servicing liabilities	127,217	412,730	1,368,219	1,036,123
Hedging results	6,521	250,146	1,027,327	587,883
Change in fair value of excess servicing spread payable to PennyMac Mortgage Investment Trust	(117,561)	(158,720)	(322,599)	(436,721)
Net loan servicing fees	132,807	66,229	412,952	205,934
Interest income:
From non-affiliates	52,276	81,925	170,148	207,670
Interest income	52,952	83,452	172,834	212,685
Interest expense:
To non-affiliates	61,109	54,089	171,482	138,723
Interest expense	63,179	56,380	177,898	146,847
Net interest (expense) income	(10,227)	27,072	(5,064)	65,838
Management fees, net:
Management fees	8,508	10,098	25,851	26,178
Result of real estate acquired in settlement of loans	1,214	188	803	1,205
Other	2,298	2,379	6,102	6,855
Total net revenue	1,119,992	436,347	2,663,451	987,029
Expenses
Compensation	202,440	141,132	550,762	362,449
Servicing	71,110	47,909	169,779	107,210
Loan origination	53,752	34,851	150,677	72,419
Technology	28,964	20,385	69,976	52,431
Professional services	18,307	9,682	44,211	21,876
Occupancy and equipment	8,491	7,257	24,822	21,075
Other	8,637	8,934	29,841	23,491
Total expenses	391,701	270,150	1,040,068	660,951
Income before provision for income taxes	728,291	166,197	1,623,383	326,078
Provision for income taxes	193,131	44,724	429,303	85,774
Net income attributable to PennyMac Financial Services, Inc. common stockholders	$ 535,160	$ 121,473	$ 1,194,080	$ 240,304
Earnings per share
Basic (in dollars per share)	$ 7.39	$ 1.55	$ 15.65	$ 3.08
Diluted (in dollars per share)	$ 7.03	$ 1.51	$ 15.00	$ 3.01
Weighted-average shares outstanding
Basic (in shares)	72,439	78,361	76,292	78,119
Diluted (in shares)	76,138	80,382	79,618	79,821
Dividend declared per share (in dollars per share)	$ 0.15		$ 0.39
PMT
Net gains on loans held for sale at fair value:
From PennyMac Mortgage Investment Trust	$ (9,775)	$ 60,662	$ 62,549	$ 122,996
Loan origination fees from PennyMac Mortgage Investment Trust	6,076	4,222	14,344	9,567
Fulfillment fees from PennyMac Mortgage Investment Trust	54,839	45,149	149,594	102,313
Loan servicing fees
Loan servicing fees from affiliates	18,752	12,964	48,806	35,102
Changes in fair value included in income	3,135	3,864	18,293	11,519
Interest income:
From PennyMac Mortgage Investment Trust	676	1,527	2,686	5,015
Interest expense:
To PennyMac Mortgage Investment Trust	2,070	2,291	6,416	8,124
Management fees, net:
Management fees	8,508	10,098	25,851	26,178
Change in fair value of investment in and dividends received from affiliate	$ (288)	$ 66	$ (602)	$ 377