CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flow from operating activities
Net income	$ 173,593	$ 376,868
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Net gains on loans held for sale at fair value	(298,459)	(754,341)
Change in fair value of mortgage servicing rights, mortgage servicing liabilities and excess servicing spread	(212,911)	(222,426)
Mortgage servicing rights hedging gains	217,860	442,151
Capitalization of interest and advance on loans held for sale	(1,926)	(90,177)
Accrual of interest on excess servicing spread financing payable to PennyMac Mortgage Investment Trust		1,280
Amortization of debt issuance costs	5,115	7,297
Change in fair value of investment in common shares of PennyMac Mortgage Investment Trust	33	(365)
Results of real estate acquired in settlement of loans	(543)	(780)
Stock based compensation expense	9,275	10,877
Reversal of provision for servicing advance losses	(30,735)	(20,536)
Impairment of capitalized software		728
Depreciation and amortization	7,011	7,632
Amortization of right-to-use assets	3,778	3,382
Purchase of loans held for sale from PennyMac Mortgage Investment Trust	(13,160,768)	(18,420,615)
Origination of loans held for sale	(10,071,516)	(14,314,637)
Purchase of loans held for sale from non-affiliates	(628,769)	(1,443,255)
Purchase of loans from Ginnie Mae securities and early buyout investors	(3,186,214)	(4,355,102)
Sale to non-affiliates and principal payments of loans held for sale	31,267,022	37,268,200
Sale to PennyMac Mortgage Investment Trust of loans held for sale	259,038
Repurchase of loans subject to representations and warranties	(17,087)	(17,986)
Decrease in servicing advances	82,438	48,372
Decrease (increase) in receivable from PennyMac Mortgage Investment Trust	12,096	14,878
Sale of real estate acquired in settlement of loans	4,422	4,946
Decrease (increase) in other assets	14,999	22,912
(Decrease) increase in accounts payable and accrued expenses	(501)	46,896
Decrease in operating lease liabilities	(3,687)	(4,066)
(Decrease) increase in payable to PennyMac Mortgage Investment Trust	(76,811)	10,696
Increase in income taxes payable	60,611	129,155
Net cash provided by (used in) operating activities	4,427,364	(1,248,016)
Cash flow from investing activities
Increase in short-term investment	(71,133)	(9,633)
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	(287,735)	(527,458)
Purchase of furniture, fixtures, equipment and leasehold improvements	(2,577)	(2,738)
Acquisition of capitalized software	(19,430)	(10,056)
Decrease in margin deposits	213,467	245,505
Net cash used in investing activities	(167,408)	(223,518)
Cash flow from financing activities
Sale of assets under agreements to repurchase	24,928,688	35,805,822
Repurchase of assets sold under agreements to repurchase	(28,889,470)	(34,613,141)
Issuance of mortgage loan participation purchase and sale certificates	5,338,287	6,339,539
Repayment of mortgage loan participation purchase and sale certificates	(5,323,593)	(6,342,269)
Repayments of obligations under capital lease	(2,093)	(1,396)
Issuance of unsecured senior notes		650,000
Repayment of excess servicing spread financing		(134,624)
Payment of debt issuance costs	(2,409)	(13,475)
Issuance of common stock pursuant to exercise of stock options	976	1,670
Payment of withholding taxes relating to stock-based compensation	(7,780)	(8,546)
Payment of dividend to holders of common stock	(11,425)	(14,375)
Repurchase of common stock	(141,412)	(288,519)
Net cash (used in) provided by financing activities	(4,110,231)	1,380,686
Net increase (decrease) in cash and restricted cash	149,725	(90,848)
Cash and restricted cash at beginning of quarter	340,093	532,781
Cash and restricted cash at end of quarter	489,818	441,933
Cash	489,799	441,870
Restricted cash included in Other assets	19	63
Supplemental cash flow information:
Cash paid for interest	82,305	112,730
Cash paid (refunds received) for income taxes, net	316	(15)
Non-cash investing activities:
Mortgage servicing rights resulting from loan sales	616,302	470,533
Operating right-of-use assets recognized		3,243
Non-cash financing activities:
Mortgage servicing liabilities resulting from loan sales		6,962
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	$ 51	$ 51