CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash flow from operating activities
Net income	$ 311,423	$ 144,656	$ 475,507
Adjustments to reconcile net income to net cash used in operating activities:
Net gains on loans held for sale at fair value	(817,368)	(545,943)	(791,633)
Change in fair value of mortgage servicing rights, mortgage servicing liabilities	433,342	605,568	(354,176)
Mortgage servicing rights hedging results	832,483	236,778	631,484
Accrual of unearned discounts on principal-only stripped mortgage-backed securities	(25,226)
Capitalization of interest on loans held for sale	(473)	(751)	(3,231)
Amortization of debt issuance costs	28,812	21,432	19,198
Change in fair value of investment in common shares of PennyMac Mortgage Investment Trust	177	(192)	371
Results of real estate acquired in settlement in loans	(864)	(1,545)	(2,510)
Repricing of payable to exchanged Private National Mortgage Acceptance Company, LLC unitholders under tax receivable agreement	(201)		(576)
Stock-based compensation expense	20,868	27,582	42,552
Provision (reversal of provision) for servicing advance losses	32,962	3,271	(36,075)
Depreciation and amortization	55,984	53,214	34,409
Impairment of capitalized software	147	46
Amortization of operating lease right-of-use assets	13,676	16,804	15,831
Purchase of loans held for sale from PennyMac Mortgage Investment Trust	(81,997,773)	(72,441,699)	(50,575,617)
Origination of loans held for sale	(18,724,478)	(10,770,257)	(20,297,064)
Purchase of loans held for sale from non-affiliates	(2,862,610)	(2,057,135)	(1,802,769)
Purchase of loans from Ginnie Mae securities and early buyout investors	(3,367,264)	(2,555,865)	(6,199,212)
Sale to non-affiliates and principal payment of loans held for sale	101,105,292	85,684,522	84,345,379
Sale of loans held for sale to PennyMac Mortgage Investment Trust	662,952		298,862
Repurchase of loans subject to representations and warranties	(89,749)	(49,575)	(92,924)
Increase in servicing advances	(15,941)	(76,614)	(36,534)
(Increase) decrease in receivable from PennyMac Mortgage Investment Trust	(4,464)	5,666	2,776
Sale of real estate acquired in settlement of loans	64,156	35,630	19,761
(Increase) decrease in other assets	(95,757)	(60,442)	191,384
(Decrease) increase in accounts payable and accrued expenses	(78,651)	121,677	(109,485)
Decrease in operating lease liabilities	(17,924)	(21,158)	(19,392)
(Decrease) increase in payable to PennyMac Mortgage Investment Trust	(84,916)	1,969	(36,708)
Payments to exchanged Private National Mortgage Acceptance Company, LLC unitholders under tax receivable agreement			(3,855)
Increase in income taxes payable	88,115	40,142	317,482
Net cash used in operating activities	(4,533,270)	(1,582,219)	6,033,235
Cash flow from investing activities
(Increase) decrease in short-term investment	(410,285)	1,926	(5,321)
Purchase of principal-only stripped mortgage-backed securities	(935,356)
Repayment of principal-only stripped mortgage-backed securities	96,516
Sale of interest-only stripped mortgage-backed securities	202,186	98,066
Net settlement of derivative financial instruments used for hedging of mortgage servicing rights	(702,593)	(241,956)	(871,878)
Purchase of mortgage servicing rights			(3,993)
Transfer of mortgage servicing rights relating to delinquent loans to Agency		305
Acquisition of capitalized software	(20,382)	(34,784)	(71,935)
Purchase of furniture, fixtures, equipment and leasehold improvements	(1,715)	(1,386)	(7,159)
Sale of furniture, fixtures and equipment		1,000
(Increase) decrease in margin deposits	(116,326)	(96,459)	238,704
Net cash used in investing activities	(1,887,955)	(273,288)	(721,582)
Cash flow from financing activities
Sale of assets under agreements to repurchase	109,006,699	85,352,643	75,076,185
Repurchase of assets sold under agreements to repurchase	(104,083,392)	(84,587,885)	(79,368,855)
Issuance of mortgage loan participation purchase and sale certificates	23,148,016	22,233,907	19,312,943
Repayment of mortgage loan participation purchase and sale certificates	(23,097,566)	(22,075,444)	(19,504,845)
Issuance of notes payable secured by mortgage servicing assets	1,050,000	1,005,000	650,000
Repayment of notes payable secured by mortgage servicing assets	(875,000)	(1,075,000)
Issuance of unsecured senior notes	650,000	750,000
Repayment of obligations under capital lease			(3,489)
Payment of debt issuance costs	(35,922)	(33,018)	(19,606)
Issuance of common stock by exercise of stock options	20,062	17,215	2,947
Payment of withholding taxes relating to stock-based compensation	(9,401)	(9,142)	(7,780)
Payment of dividends to holders of common stock	(52,160)	(41,446)	(54,621)
Repurchase of common stock		(71,491)	(406,086)
Net cash provided by (used in) financing activities	5,721,336	1,465,339	(4,323,207)
Net decrease in cash and restricted cash	(699,889)	(390,168)	988,446
Cash and restricted cash at beginning of period	938,371	1,328,539	340,093
Cash at end of period	238,482	938,371	1,328,539
Supplemental cash flow information:
Cash paid for interest	797,212	639,486	329,975
Cash paid (refunds received) for income taxes, net	1,488	(1,167)	(127,742)
Non-cash investing activities:
Mortgage servicing rights received from loan sales	2,280,830	1,849,957	1,718,094
Exchange of mortgage servicing spread for interest-only stripped mortgage-backed securities	202,186	98,066
Operating right-of-use assets recognized	1,388	2,893	1,364
Non-cash financing activities:
Issuance of common stock in settlement of directors' fees	$ 256	$ 180	$ 205