CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flow from operating activities
Net income	$ 437,890	$ 830,407
Adjustments to reconcile net income to net cash provided by operating activities:
Net gains on loans held for sale at fair value	(689,720)	(1,963,743)
Change in fair value of mortgage servicing rights, mortgage servicing liabilities and excess servicing spread	(420,424)	261,511
Mortgage servicing rights hedging gains	558,614	437,492
Capitalization of interest and advance on loans held for sale	(3,122)	(4,573)
Accrual of interest on excess servicing spread financing payable to PennyMac Mortgage Investment Trust		1,280
Amortization of debt issuance costs	14,560	19,154
Change in fair value of investment in common shares of PennyMac Mortgage Investment Trust	416	(372)
Results of real estate acquired in settlement of loans	(1,881)	(1,698)
Stock based compensation expense	30,689	28,595
Reversal of provision for servicing advance losses	(52,113)	(44,535)
Depreciation and amortization	23,809	21,729
Impairment of capitalized software		728
Amortization of right-to-use assets	11,796	10,539
Purchase of loans held for sale from PennyMac Mortgage Investment Trust	(36,544,166)	(51,471,399)
Origination of loans held for sale	(18,343,547)	(41,634,531)
Purchase of loans held for sale from non-affiliates	(1,564,173)	(3,867,782)
Purchase of loans from Ginnie Mae securities and early buyout investors	(5,620,437)	(17,969,911)
Sale to non-affiliates and principal payments of loans held for sale	67,056,886	118,048,768
Sale of loans held for sale to PennyMac Mortgage Investment Trust	298,862
Repurchase of loans subject to representations and warranties	(76,865)	(75,023)
Decrease (increase) in servicing advances	234,529	(18,718)
Decrease in receivable from PennyMac Mortgage Investment Trust	6,941	27,404
Sale of real estate acquired in settlement of loans	15,419	11,712
Decrease (increase) in other assets	74,433	95,836
(Decrease) increase in accounts payable and accrued expenses	(13,922)	45,707
Decrease in operating lease liabilities	(12,562)	(12,457)
Decrease in payable to PennyMac Mortgage Investment Trust	(153,276)	(39,755)
Payments to exchanged Private National Mortgage Acceptance Company, LLC unitholders under tax receivable agreement	(3,855)	(3,350)
Increase in income taxes payable	279,045	37,068
Net cash provided by operating activities	5,543,826	2,770,083
Cash flow from investing activities
(Increase) decrease in short-term investment	(29,225)	10,171
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	(810,749)	(471,322)
Purchase of mortgage servicing rights	(3,927)
Acquisition of capitalized software	(59,631)	(32,276)
Purchase of furniture, fixtures, equipment and leasehold improvements	(5,604)	(5,999)
Decrease in margin deposits	425,569	117,106
Net cash used in investing activities	(483,567)	(301,458)
Cash flow from financing activities
Sale of assets under agreements to repurchase	58,606,620	100,929,294
Repurchase of assets sold under agreements to repurchase	(62,413,898)	(103,689,987)
Issuance of mortgage loan participation purchase and sale certificates	14,947,597	17,990,980
Repayment of mortgage loan participation purchase and sale certificates	(15,059,445)	(17,992,673)
Repayments of obligations under capital lease	(3,489)	(6,281)
Issuance of notes payable secured by mortgage servicing assets	500,000
Issuance of unsecured senior notes		1,150,000
Repayment of excess servicing spread financing		(134,624)
Payment of debt issuance costs	(14,087)	(27,355)
Issuance of common stock pursuant to exercise of stock options	1,777	5,770
Payment of withholding taxes relating to stock-based compensation	(7,780)	(8,578)
Payment of dividend to holders of common stock	(44,206)	(40,638)
Repurchase of common stock	(354,759)	(700,793)
Net cash used in financing activities	(3,841,670)	(2,524,885)
Net increase (decrease) in cash and restricted cash	1,218,589	(56,260)
Cash and restricted cash at beginning of period	340,093	532,781
Cash and restricted cash at end of period	1,558,682	476,521
Cash	1,558,679	476,497
Restricted cash included in Other assets	3	24
Supplemental cash flow information:
Cash paid for interest	236,504	301,014
Cash (refunds received) paid for income taxes, net	(119,417)	257,597
Non-cash investing activities:
Mortgage servicing rights resulting from loan sales	1,359,632	1,386,324
Operating right-of-use assets recognized	1,364	20,871
Unsettled portion of MSR acquisitions	213
Non-cash financing activities:
Mortgage servicing liabilities resulting from loan sales		98,147
Issuance of Excess servicing spread payable to PennyMac Mortgage Investment Trust pursuant to a recapture agreement		557
Issuance of common stock in settlement of directors' fees	$ 154	$ 151