CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flow from operating activities
Net income	$ 144,656	$ 475,507	$ 1,003,490
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Net gains on loans held for sale at fair value	(545,943)	(791,633)	(2,464,401)
Change in fair value of mortgage servicing rights, mortgage servicing liabilities	605,568	(354,176)	416,943
Mortgage servicing rights hedging results	236,778	631,484	475,215
Capitalization of interest on loans held for sale	(751)	(3,231)	(19,244)
Accrual of interest on excess servicing spread financing payable to PennyMac Mortgage Investment Trust			1,280
Amortization of debt issuance costs	21,432	19,198	24,321
Change in fair value of investment in common shares of PennyMac Mortgage Investment Trust	(192)	371	(195)
Results of real estate acquired in settlement in loans	(1,545)	(2,510)	(1,993)
Repricing of payable to exchanged Private National Mortgage Acceptance Company, LLC unitholders under tax receivable agreement		(576)
Stock-based compensation expense	27,582	42,552	37,794
Provision (reversal of provision) for servicing advance losses	3,271	(36,075)	(47,878)
Depreciation and amortization	53,214	34,409	28,645
Impairment of capitalized software	46		728
Amortization of operating lease right-of-use assets	16,804	15,831	14,295
Purchase of loans held for sale from PennyMac Mortgage Investment Trust	(72,441,699)	(50,575,617)	(67,851,634)
Origination of loans held for sale	(10,770,257)	(20,297,064)	(54,857,114)
Purchase of loans held for sale from non-affiliates	(2,057,135)	(1,802,769)	(4,896,527)
Purchase of loans from Ginnie Mae securities and early buyout investors	(2,555,865)	(6,199,212)	(23,644,025)
Sale to non-affiliates and principal payment of loans held for sale	85,684,522	84,345,379	154,450,942
Sale of loans held for sale to PennyMac Mortgage Investment Trust		298,862
Repurchase of loans subject to representations and warranties	(49,575)	(92,924)	(99,508)
Increase in servicing advances	(76,614)	(36,534)	(232,574)
Decrease in receivable from PennyMac Mortgage Investment Trust	5,666	2,776	35,243
Sale of real estate acquired in settlement of loans	35,630	19,761	14,555
(Increase) decrease in other assets	(60,442)	191,384	61,871
Increase (decrease) in accounts payable and accrued expenses	121,677	(109,485)	34,666
Decrease in operating lease liabilities	(21,158)	(19,392)	(16,310)
Increase (decrease) in payable to PennyMac Mortgage Investment Trust	1,969	(36,708)	36,549
Payments to exchanged Private National Mortgage Acceptance Company, LLC unitholders under tax receivable agreement		(3,855)	(4,635)
Increase in income taxes payable	40,142	317,482	62,562
Net cash (used in) provided by operating activities	(1,582,219)	6,033,235	2,563,061
Cash flow from investing activities
Decrease (increase) in short-term investment	1,926	(5,321)	8,344
Sale of interest-only stripped securities	98,066
Net change in assets purchased from PMT under agreement to resell			80,862
Net settlement of derivative financial instruments used for hedging of mortgage servicing rights	(241,956)	(871,878)	(434,397)
Purchase of mortgage servicing rights		(3,993)
Transfer of mortgage servicing rights related to delinquent loans to Agency	305
Acquisition of capitalized software	(34,784)	(71,935)	(48,980)
Purchase of furniture, fixtures, equipment and leasehold improvements	(1,386)	(7,159)	(7,899)
Sale of furniture, fixtures and equipment	1,000
(Increase) decrease in margin deposits	(96,459)	238,704	97,701
Net cash used in investing activities	(273,288)	(721,582)	(304,369)
Cash flow from financing activities
Sale of assets under agreements to repurchase	85,352,643	75,076,185	136,179,744
Repurchase of assets sold under agreements to repurchase	(84,587,885)	(79,368,855)	(138,546,379)
Issuance of mortgage loan participation purchase and sale certificates	22,233,907	19,312,943	23,784,510
Repayment of mortgage loan participation purchase and sale certificates	(22,075,444)	(19,504,845)	(23,826,142)
Issuance of notes payable secured by mortgage servicing assets	1,005,000	650,000
Repayment of notes payable secured by mortgage servicing assets	(1,075,000)
Issuance of unsecured senior notes	750,000		1,150,000
Repayment of obligations under capital lease		(3,489)	(8,375)
Repayment of excess servicing spread financing			(134,624)
Payment of debt issuance costs	(33,018)	(19,606)	(37,567)
Issuance of common stock pursuant to exercise of stock options	17,215	2,947	7,536
Payment of withholding taxes relating to stock-based compensation	(9,142)	(7,780)	(8,993)
Payment of dividends to holders of common stock	(41,446)	(54,621)	(52,896)
Repurchase of common stock	(71,491)	(406,086)	(958,194)
Net cash provided by (used in) financing activities	1,465,339	(4,323,207)	(2,451,380)
Net (decrease) increase in cash and restricted cash	(390,168)	988,446	(192,688)
Cash and restricted cash at beginning of year	1,328,539	340,093	532,781
Cash and restricted cash at end of year	938,371	1,328,539	340,093
Cash	938,371	1,328,536	340,069
Restricted cash included in Other assets		3	24
Supplemental cash flow information:
Cash paid for interest	639,486	329,975	389,527
(Refunds received) cash paid for income taxes, net	(1,167)	(127,742)	293,131
Non-cash investing activities:
Mortgage servicing rights received from loan sales	1,849,957	1,718,094	1,861,949
Exchange of mortgage servicing spread for interest-only stripped securities	98,066
Operating right-of-use assets recognized	2,893	1,364	28,401
Non-cash financing activities:
Mortgage servicing liabilities resulting from loan sales			106,631
Issuance of Excess servicing spread payable to PennyMac Mortgage Investment Trust pursuant to a recapture agreement			557
Issuance of common stock in settlement of director fees	$ 180	$ 205	$ 200