CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Cash flow from operating activities
Net income	$ 76,280	$ 39,308
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Net gains on loans held for sale at fair value	(221,037)	(162,441)
Change in fair value of mortgage servicing rights and mortgage servicing liabilities	430,956	28,585
Mortgage servicing rights hedging results	(106,774)	294,645
Accrual of unearned discounts on principal-only stripped mortgage-backed securities	(11,335)	(264)
Capitalization of interest on loans held for sale	(210)	(128)
Amortization of debt issuance costs	7,072	7,357
Change in fair value of investment in common shares of PennyMac Mortgage Investment Trust	(155)	20
Results of real estate acquired in settlement in loans	225	(406)
Stock-based compensation expense	11,084	4,583
Provision (reversal of provision) for servicing advance losses	4,184	(1,541)
Depreciation and amortization	13,896	14,164
Amortization of operating lease right-of-use assets	3,405	3,436
Purchase of loans held for sale from PennyMac Mortgage Investment Trust	(20,437,666)	(16,302,059)
Origination of loans held for sale	(5,084,079)	(3,073,792)
Purchase of loans held for sale from non-affiliates	(815,720)	(496,609)
Purchase of loans from Ginnie Mae securities and early buyout investors	(1,079,557)	(791,726)
Sale to non-affiliates and principal payment of loans held for sale	27,587,429	19,676,917
Sale of loans held for sale to PennyMac Mortgage Investment Trust	654,808
Repurchase of loans subject to representations and warranties	(19,942)	(21,395)
Decrease in servicing advances	25,134	168,554
Increase in receivable from PennyMac Mortgage Investment Trust	(229)	(1,999)
Sale of real estate acquired in settlement of loans	19,992	13,165
Increase in other assets	(9,458)	(33,707)
Increase (decrease) in accounts payable and accrued expenses	14,769	(182,097)
Decrease in operating lease liabilities	(4,630)	(4,380)
Decrease in payable to PennyMac Mortgage Investment Trust	(20,126)	(80,581)
Increase in income taxes payable	27,641	4,451
Net cash provided by (used in) operating activities	1,065,957	(897,940)
Cash flow from investing activities
(Increase) decrease in short-term investment	(22,840)	10,199
Purchase of principal-only stripped mortgage-backed securities		(524,739)
Repayment of principal-only stripped mortgage-backed securities	37,738	116
Net settlement of derivative financial instruments used for hedging of mortgage servicing rights	74,572	(224,750)
Acquisition of capitalized software	(7,137)	(3,864)
Purchase of furniture, fixtures, equipment and leasehold improvements	(371)	(918)
Increase in margin deposits	(51,578)	(38,656)
Net cash provided by (used in) investing activities	30,384	(782,612)
Cash flow from financing activities
Sale of assets under agreements to repurchase	27,533,478	20,836,772
Repurchase of assets sold under agreements to repurchase	(29,161,286)	(19,165,094)
Issuance of mortgage loan participation purchase and sale certificates	5,807,294	5,399,717
Repayment of mortgage loan participation purchase and sale certificates	(5,793,836)	(5,482,145)
Issuance of notes payable secured by mortgage servicing assets		725,000
Repayment of notes payable secured by mortgage servicing assets	(325,000)	(625,000)
Issuance of unsecured senior notes	850,000
Payment of debt issuance costs	(21,064)	(7,480)
Issuance of common stock by exercise of stock options	5,452	7,626
Payment of withholding taxes relating to stock-based compensation	(3,763)	(9,401)
Payment of dividends to holders of common stock	(15,005)	(10,420)
Net cash (used in) provided by financing activities	(1,123,730)	1,669,575
Net decrease in cash	(27,389)	(10,977)
Cash at beginning of quarter	238,482	938,371
Cash at end of quarter	211,093	927,394
Supplemental cash flow information:
Cash paid for interest	205,446	152,261
Cash paid for income taxes, net	274	124
Non-cash investing activities:
Mortgage servicing rights received from loan sales	650,349	412,520
Operating right-of-use assets recognized	561
Non-cash financing activities:
Issuance of common stock in settlement of directors' fees	$ 57	$ 84