CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Mortgage loan servicing fees
From non-affiliates and affiliates	$ 147,182	$ 126,416	$ 421,536	$ 345,231
Ancillary and other fees	17,009	15,548	44,817	38,616
Net servicing fees	174,262	153,782	496,877	417,289
Amortization, impairment and change in fair value of mortgage servicing rights and mortgage servicing liabilities	(63,450)	(80,529)	(147,670)	(232,889)
Change in fair value of excess servicing spread payable to PennyMac Mortgage Investment Trust	(64,559)	(75,701)	(156,696)	(218,132)
Net mortgage loan servicing fees	109,703	78,081	340,181	199,157
Net gains on mortgage loans held for sale at fair value:
From non-affiliates	38,349	98,235	143,396	285,599
Net gains on mortgage loans held for sale at fair value	56,914	108,136	189,274	293,183
Mortgage loan origination fees from non-affiliates	24,366	31,060	70,607	83,558
Mortgage loan origination fees	26,485	33,168	75,476	88,935
Interest income:
From non-affiliates	59,152	42,326	152,997	97,328
Interest income	60,964	44,442	158,683	103,274
Interest expense:
To non-affiliates	35,035	38,494	96,552	95,832
Interest expense	38,775	42,492	108,136	108,843
Net interest income (expense):	22,189	1,950	50,547	(5,569)
Management fees, net:
Management fees	6,471	6,216	17,910	17,597
Result of real estate acquired in settlement of loans	194	281	179	137
Other	2,605	487	7,048	3,068
Total net revenue	250,929	250,635	733,428	656,829
Expenses
Compensation	103,364	93,417	303,917	261,624
Servicing	40,797	24,968	95,586	76,513
Technology	15,273	13,926	45,047	36,863
Occupancy and equipment	7,117	5,933	20,001	16,940
Professional services	7,117	4,636	18,442	12,977
Loan origination	7,203	5,581	14,462	14,830
Marketing	2,275	2,375	6,654	6,594
Other	6,086	5,655	19,928	16,352
Total expenses	189,232	156,491	524,037	442,693
Income before provision for income taxes	61,697	94,144	209,391	214,136
Provision for income taxes	5,545	11,652	17,908	26,512
Net income	56,152	82,492	191,483	187,624
Less: Net income attributable to noncontrolling interest	41,663	65,411	142,538	149,185
Net income attributable to PennyMac Financial Services, Inc. common stockholders	$ 14,489	$ 17,081	$ 48,945	$ 38,439
Earnings per share
Basic (in dollars per share)	$ 0.58	$ 0.73	$ 1.99	$ 1.66
Diluted (in dollars per share)	$ 0.57	$ 0.71	$ 1.94	$ 1.62
Weighted-average shares outstanding
Basic (in shares)	25,125	23,426	24,644	23,147
Diluted (in shares)	78,913	78,416	78,954	78,231
Dividend declared per share of Class A common stock	$ 0.40		$ 0.40
PMT
Mortgage loan servicing fees
From non-affiliates and affiliates	$ 10,071	$ 11,402	$ 30,521	$ 31,987
Changes in fair value included in income	(1,109)	4,828	(9,026)	14,757
Net gains on mortgage loans held for sale at fair value:
From PennyMac Mortgage Investment Trust	18,565	9,901	45,878	7,584
Mortgage loan origination fees from PennyMac Mortgage Investment Trust	2,119	2,108	4,869	5,377
Fulfillment fees from PennyMac Mortgage Investment Trust	26,256	23,507	52,759	61,184
Interest income:
From PennyMac Mortgage Investment Trust	1,812	2,116	5,686	5,946
Interest expense:
To PennyMac Mortgage Investment Trust	3,740	3,998	11,584	13,011
Management fees, net:
Management fees	6,482	6,038	17,906	16,684
Change in fair value of investment in and dividends received from affiliate	129	(33)	419	182
Investment Funds
Mortgage loan servicing fees
From non-affiliates and affiliates		416	3	1,455
Management fees, net:
Management fees	(11)	178	4	913
Carried Interest from Investment Funds	$ (17)	$ (1,158)	$ (365)	$ (1,045)