CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flow from operating activities
Net income	$ 475,507	$ 1,003,490	$ 1,646,884
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Net gains on loans held for sale at fair value	(791,633)	(2,464,401)	(2,740,785)
Change in fair value of mortgage servicing rights, mortgage servicing liabilities and excess servicing spread	(354,176)	416,943	1,477,023
Mortgage servicing rights hedging gains	631,484	475,215	(918,180)
Capitalization of interest on loans held for sale	(3,231)	(19,244)	(119,740)
Accrual of interest on excess servicing spread financing payable to PennyMac Mortgage Investment Trust		1,280	8,418
Amortization of debt issuance costs	19,198	24,321	19,048
Change in fair value of investment in common shares of PennyMac Mortgage Investment Trust	371	(195)	567
Results of real estate acquired in settlement of loans	(2,510)	(1,993)	(1,036)
Repricing of payable to exchanged Private National Mortgage Acceptance Company, LLC unitholders under tax receivable agreement	(576)		(280)
Stock based compensation expense	42,552	37,794	45,105
(Reversal of) provision for servicing advance losses	(36,075)	(47,878)	125,898
Depreciation and amortization	34,409	28,645	25,575
Impairment of capitalized software		728	13,145
Amortization of operating lease right-to-use assets	15,831	14,295	12,284
Purchase of loans held for sale from PennyMac Mortgage Investment Trust	(50,575,617)	(67,851,634)	(63,618,185)
Origination of loans held for sale	(20,297,064)	(54,857,114)	(31,783,465)
Purchase of loans held for sale from non-affiliates	(1,802,769)	(4,896,527)	(3,799,336)
Purchase of loans from Ginnie Mae securities and early buyout investors	(6,199,212)	(23,644,025)	(11,156,684)
Sale to non-affiliates and principal payments of loans held for sale	84,345,379	154,450,942	102,840,312
Sale of loans held for sale to PennyMac Mortgage Investment Trust	298,862		2,248,896
Repurchase of loans subject to representations and warranties	(92,924)	(99,508)	(58,375)
Settlement of repurchase agreement derivatives			8,270
Increase in servicing advances	(36,534)	(232,574)	(391,440)
Decrease (increase) in receivable from PennyMac Mortgage Investment Trust	2,776	35,243	(48,320)
Sale of real estate acquired in settlement of loans	19,761	14,555	32,555
Decrease (increase) in other assets	191,384	61,871	(334,045)
(Decrease) increase in accounts payable and accrued expenses	(109,485)	34,666	135,314
Decrease in operating lease liabilities	(19,392)	(16,310)	(13,421)
(Decrease) increase in payable to PennyMac Mortgage Investment Trust	(36,708)	36,549	37,642
Payments to exchanged Private National Mortgage Acceptance Company, LLC unitholders under tax receivable agreement	(3,855)	(4,635)	(10,713)
Increase in income taxes payable	317,482	62,562	118,131
Net cash provided by (used in) operating activities	6,033,235	2,563,061	(6,198,938)
Cash flow from investing activities
(Increase) decrease in short-term investment	(5,321)	8,344	59,394
Net change in assets purchased from PMT under agreement to resell		80,862	26,650
Net settlement of derivative financial instruments used for hedging of mortgage servicing rights	(871,878)	(434,397)	913,064
Purchase of mortgage servicing rights	(3,993)		(25,473)
Acquisition of capitalized software	(71,935)	(48,980)	(48,090)
Purchase of furniture, fixtures, equipment and leasehold improvements	(7,159)	(7,899)	(10,671)
Decrease (increase) in margin deposits	238,704	97,701	(131,840)
Net cash (used in) provided by investing activities	(721,582)	(304,369)	783,034
Cash flow from financing activities
Sale of assets under agreements to repurchase	75,076,185	136,179,744	102,232,005
Repurchase of assets sold under agreements to repurchase	(79,368,855)	(138,546,379)	(96,709,690)
Issuance of mortgage loan participation purchase and sale certificates	19,312,943	23,784,510	23,607,079
Repayment of mortgage loan participation purchase and sale certificates	(19,504,845)	(23,826,142)	(23,583,550)
Issuance of notes payable secured by mortgage servicing assets	650,000
Issuance of unsecured senior notes		1,150,000	650,000
Repayments of obligations under capital lease	(3,489)	(8,375)	(8,946)
Repayment of excess servicing spread financing		(134,624)	(32,377)
Payment of debt issuance costs	(19,606)	(37,567)	(30,112)
Issuance of common stock pursuant to exercise of stock options	2,947	7,536	9,389
Payment of withholding taxes relating to stock-based compensation	(7,780)	(8,993)	(5,265)
Payment of dividend to holders of common stock	(54,621)	(52,896)	(30,947)
Repurchase of common stock	(406,086)	(958,194)	(337,479)
Net cash (used in) provided by financing activities	(4,323,207)	(2,451,380)	5,760,107
Net increase (decrease) in cash and restricted cash	988,446	(192,688)	344,203
Cash and restricted cash at beginning of year	340,093	532,781	188,578
Cash and restricted cash at end of year	1,328,539	340,093	532,781
Cash	1,328,536	340,069	532,716
Restricted cash included in Other assets	3	24	65
Supplemental cash flow information:
Cash paid for interest	329,975	389,527	272,970
Cash (refunds received) paid for income taxes, net	(127,742)	293,131	475,594
Non-cash investing activities:
Mortgage servicing rights resulting from loan sales	1,718,094	1,861,949	1,138,045
Operating right-of-use assets recognized	1,364	28,401	14,128
Non-cash financing activities:
Mortgage servicing liabilities resulting from loan sales		106,631	23,325
Issuance of Excess servicing spread payable to PennyMac Mortgage Investment Trust pursuant to a recapture agreement		557	2,093
Issuance of common stock in settlement of director fees	$ 205	$ 200	$ 194