CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash flow from operating activities
Net income	$ 137,566	$ 88,628
Adjustments to reconcile net income to net cash used in operating activities:
Net gains on loans held for sale at fair value	(338,505)	(245,804)
Change in fair value of mortgage servicing rights and mortgage servicing liabilities	129,900	291,704
Mortgage servicing rights hedging results	466,422	107,909
Accrual of unearned discounts on mortgage-backed securities	(9,090)
Capitalization of interest on loans held for sale	(247)	(507)
Amortization of debt issuance costs	14,798	9,315
Change in fair value of investment in common shares of PennyMac Mortgage Investment Trust	90	(82)
Results of real estate acquired in settlement in loans	(599)	(341)
Stock-based compensation expense	2,371	12,025
Provision (reversal of provision) for servicing advance losses	4,391	(5,049)
Depreciation and amortization	28,404	25,939
Amortization of operating lease right-of-use assets	6,883	9,154
Purchase of loans held for sale from PennyMac Mortgage Investment Trust	(37,161,319)	(32,087,157)
Origination of loans held for sale	(6,972,822)	(5,303,061)
Purchase of loans held for sale from non-affiliates	(1,193,246)	(968,096)
Purchase of loans from Ginnie Mae securities and early buyout investors	(1,579,386)	(1,395,735)
Sale to non-affiliates and principal payment of loans held for sale	44,537,449	38,410,109
Repurchase of loans subject to representations and warranties	(44,863)	(24,345)
Decrease in servicing advances	219,799	164,845
(Increase) decrease in receivable from PennyMac Mortgage Investment Trust	(1,541)	11,537
Sale of real estate acquired in settlement of loans	25,671	16,411
Increase in other assets	(39,753)	(81,155)
Decrease in accounts payable and accrued expenses	(145,062)	(3,977)
Decrease in operating lease liabilities	(8,809)	(10,080)
Decrease in payable to PennyMac Mortgage Investment Trust	(108,839)	(82,156)
Increase in income taxes payable	39,511	23,403
Net cash used in operating activities	(1,990,826)	(1,036,566)
Cash flow from investing activities
(Increase) decrease in short-term investment	(178,504)	4,106
Purchase of principal-only stripped mortgage-backed securities	(935,356)
Repayment of principal-only stripped mortgage-backed securities	13,452
Net settlement of derivative financial instruments used for hedging of mortgage servicing rights	(391,462)	(20,239)
Transfer of mortgage servicing rights relating to delinquent loans to Agency		232
Acquisition of capitalized software	(8,661)	(19,244)
Purchase of furniture, fixtures, equipment and leasehold improvements	(1,319)	(631)
Increase in margin deposits	(18,556)	(150,716)
Net cash used in investing activities	(1,520,406)	(186,492)
Cash flow from financing activities
Sale of assets under agreements to repurchase	48,557,391	39,333,545
Repurchase of assets sold under agreements to repurchase	(45,912,545)	(38,551,928)
Issuance of mortgage loan participation purchase and sale certificates	10,967,597	10,042,768
Repayment of mortgage loan participation purchase and sale certificates	(10,901,474)	(9,824,304)
Issuance of notes payable secured by mortgage servicing assets	725,000	680,000
Repayment of notes payable secured by mortgage servicing assets	(875,000)	(150,000)
Issuance of unsecured senior notes	650,000
Payment of debt issuance costs	(25,208)	(10,119)
Issuance of common stock pursuant to exercise of stock options	12,654	8,647
Payment of withholding taxes relating to stock-based compensation	(9,401)	(9,142)
Payment of dividends to holders of common stock	(20,817)	(20,974)
Repurchase of common stock		(71,575)
Net cash provided by financing activities	3,168,197	1,426,918
Net (decrease) increase in cash and restricted cash	(343,035)	203,860
Cash and restricted cash at beginning of period	938,371	1,328,539
Cash and restricted cash at end of period	595,336	1,532,399
Supplemental cash flow information:
Cash paid for interest	373,389	305,512
Cash paid (refunds received) for income taxes, net	660	(967)
Non-cash investing activities:
Mortgage servicing rights received from loan sales	953,727	849,056
Operating right-of-use assets recognized		1,727
Non-cash financing activities:
Issuance of common stock in settlement of directors' fees	$ 142	$ 102