CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net gains on loans held for sale at fair value:
From non-affiliates	$ 542,163	$ 184,439	$ 369,815
Net gains on loans held for sale at fair value	725,528	249,022	391,804
Loan origination fees from non-affiliates	159,461	94,208	112,124
Loan origination fees	174,156	101,641	119,202
Loan servicing fees
From non-affiliates and affiliates	730,165	585,101	475,848
Other fees	98,564	64,133	58,924
Loan servicing fees	877,526	691,282	579,297
Amortization, impairment and change in fair value of mortgage servicing rights and mortgage servicing liabilities	(593,117)	(237,389)	(292,588)
Change in fair value of excess servicing spread payable to PennyMac Mortgage Investment Trust	(583,861)	(245,889)	(273,238)
Net loan servicing fees	293,665	445,393	306,059
Interest income:
From non-affiliates	282,398	208,954	135,141
Interest income	288,700	216,416	143,179
Interest expense:
To non-affiliates	201,688	129,459	127,569
Interest expense	211,979	144,597	144,520
Net interest income (expense)	76,721	71,819	(1,341)
Management fees, net:
Management fees	36,492	24,469	23,585
Carried interest from Investment Funds		(365)	(1,040)
Result of real estate acquired in settlement of loans	557	589	94
Repricing of payable to exchanged Private National Mortgage Acceptance Company , LLC unitholders under tax receivable agreement	379	1,126	32,940
Other	8,880	9,253	3,683
Total net revenue	1,477,404	984,629	955,463
Expenses
Compensation	503,458	403,270	358,721
Servicing	164,697	137,104	117,696
Loan origination	117,338	27,398	20,429
Technology	67,946	60,103	52,013
Professional services	32,859	27,615	17,845
Occupancy and equipment	28,916	27,152	22,615
Other	32,746	34,290	30,235
Total expenses	947,960	716,932	619,554
Income before provision for income taxes	529,444	267,697	335,909
Provision for income taxes	136,479	23,254	24,387
Net income	392,965	244,443	311,522
Less: Net income attributable to noncontrolling interest		156,749	210,765
Net income attributable to PennyMac Financial Services, Inc. common stockholders	$ 392,965	$ 87,694	$ 100,757
Earnings per share
Basic (in dollars per share)	$ 5.02	$ 2.62	$ 4.34
Diluted (in dollars per share)	$ 4.89	$ 2.59	$ 4.03
Weighted-average shares outstanding
Basic (in shares)	78,206	33,524	23,199
Diluted (in shares)	80,340	35,322	24,999
PMT
Net gains on loans held for sale at fair value:
Recapture payable to PennyMac Mortgage Investment Trust	$ 183,365	$ 64,583	$ 21,989
Loan origination fees from PennyMac Mortgage Investment Trust	14,695	7,433	7,078
Fulfillment fees from PennyMac Mortgage Investment Trust	160,610	81,350	80,359
Loan servicing fees
From non-affiliates and affiliates	48,797	42,045	43,064
Change in fair value of excess servicing spread payable to PennyMac Mortgage Investment Trust	9,256	(8,500)	19,350
Interest income:
From PennyMac Mortgage Investment Trust	6,302	7,462	8,038
Interest expense:
To PennyMac Mortgage Investment Trust	10,291	15,138	16,951
Management fees, net:
Management fees	36,492	24,465	22,584
Change in fair value of investment in and dividends received from affiliate	$ 416	332	118
Investment Funds
Loan servicing fees
From non-affiliates and affiliates		3	1,461
Management fees, net:
Management fees		4	1,001
Carried interest from Investment Funds		$ (365)	$ (1,040)