CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flow from operating activities
Net income	$ 39,308	$ 30,378
Adjustments to reconcile net income to net cash used in operating activities:
Net gains on loans held for sale at fair value	(162,441)	(104,385)
Change in fair value of mortgage servicing rights and mortgage servicing liabilities	28,585	236,447
Mortgage servicing rights hedging results	294,645	(47,227)
Accrual of unearned discounts on mortgage-backed securities	(264)
Capitalization of interest on loans held for sale	(128)	(223)
Amortization of debt issuance costs	7,357	4,708
Change in fair value of investment in common shares of PennyMac Mortgage Investment Trust	20	4
Results of real estate acquired in settlement in loans	(406)	(142)
Stock-based compensation expense	4,583	11,650
Reversal of provision for servicing advance losses	(1,541)	(3,081)
Depreciation and amortization	14,164	12,705
Amortization of operating lease right-of-use assets	3,436	5,055
Purchase of loans held for sale from PennyMac Mortgage Investment Trust	(16,302,059)	(13,451,030)
Origination of loans held for sale	(3,073,792)	(2,194,780)
Purchase of loans held for sale from non-affiliates	(496,609)	(404,963)
Purchase of loans from Ginnie Mae securities and early buyout investors	(791,726)	(714,110)
Sale to non-affiliates and principal payment of loans held for sale	19,676,917	13,385,341
Repurchase of loans subject to representations and warranties	(21,395)	(10,460)
Decrease in servicing advances	168,554	138,018
(Increase) decrease in receivable from PennyMac Mortgage Investment Trust	(1,999)	1,872
Sale of real estate acquired in settlement of loans	13,165	7,533
Increase in other assets	(33,707)	(64,777)
Decrease in accounts payable and accrued expenses	(182,097)	(43,767)
Decrease in operating lease liabilities	(4,380)	(4,914)
Decrease in payable to PennyMac Mortgage Investment Trust	(80,581)	(62,927)
Increase in income taxes payable	4,451	8,184
Net cash used in operating activities	(897,940)	(3,264,891)
Cash flow from investing activities
Decrease in short-term investment	10,199	8,610
Purchase of principal-only stripped mortgage-backed securities	(524,739)
Repayment of principal-only stripped mortgage-backed securities	116
Net settlement of derivative financial instruments used for hedging of mortgage servicing rights	(224,750)	78,438
Transfer of mortgage servicing rights relating to delinquent loans to Agency		232
Acquisition of capitalized software	(3,864)	(10,590)
Purchase of furniture, fixtures, equipment and leasehold improvements	(918)	(173)
Increase in margin deposits	(38,656)	(97,450)
Net cash used in investing activities	(782,612)	(20,933)
Cash flow from financing activities
Sale of assets under agreements to repurchase	20,836,772	16,713,811
Repurchase of assets sold under agreements to repurchase	(19,165,094)	(13,949,931)
Issuance of mortgage loan participation purchase and sale certificates	5,399,717	4,170,792
Repayment of mortgage loan participation purchase and sale certificates	(5,482,145)	(3,943,198)
Issuance of notes payable secured by mortgage servicing assets	725,000	680,000
Repayment of notes payable secured by mortgage servicing assets	(625,000)	(150,000)
Payment of debt issuance costs	(7,480)	(5,345)
Issuance of common stock pursuant to exercise of stock options	7,626	4,342
Payment of withholding taxes relating to stock-based compensation	(9,401)	(9,142)
Payment of dividends to holders of common stock	(10,420)	(10,777)
Repurchase of common stock		(45,361)
Net cash provided by financing activities	1,669,575	3,455,191
Net (decrease) increase in cash and restricted cash	(10,977)	169,367
Cash and restricted cash at beginning of quarter	938,371	1,328,539
Cash and restricted cash at end of quarter	927,394	1,497,906
Supplemental cash flow information:
Cash paid for interest	152,261	129,791
Cash paid (refunds received) for income taxes, net	124	(415)
Non-cash investing activities:
Mortgage servicing rights received from loan sales	412,520	286,533
Operating right-of-use assets recognized		1,727
Non-cash financing activities:
Issuance of common stock in settlement of director fees	$ 84	$ 51