CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flow from operating activities
Net income	$ 306,243	$ 46,135
Adjustments to reconcile net income to net cash used in operating activities:
Net gains on loans held for sale at fair value	(344,282)	(84,776)
Change in fair value of mortgage servicing rights, mortgage servicing liabilities and excess servicing spread	(15,879)	118,806
Capitalization of interest on loans held for sale at fair value	(18,131)	(16,487)
Amortization of net debt issuance cost and (premiums)	2,209	(6,570)
Results of real estate acquired in settlement of loans	707	(274)
Stock based compensation expense	12,368	4,531
Provision for servicing advance losses	3,806	4,820
Depreciation and amortization	5,352	3,159
Amortization of right-to-use assets	2,985	2,359
Origination of loans held for sale	(4,954,316)	(1,542,056)
Purchase of loans held for sale from non-affiliates	(620,859)	(177,678)
Purchase of loans from Ginnie Mae securities and early buyout investors for modification and subsequent sale	(2,299,262)	(941,154)
Sale to non-affiliates and principal payments of loans held for sale	19,337,017	8,536,430
Repurchase of loans subject to representations and warranties	(16,282)	(4,064)
Settlement of repurchase agreement derivatives		11,436
Increase in servicing advances	18,467	24,087
Sale of real estate acquired in settlement of loans	9,459	2,075
Decrease (increase) in other assets	628	(38,676)
Decrease in operating lease liabilities	(3,469)	(2,977)
Increase in accounts payable and accrued expenses	21,866	10,483
Net cash (used in) operating activities	(730,284)	(134,247)
Cash flow from investing activities
Decrease (increase) in short-term investments	72,727	(31,548)
Net settlement of derivative financial instruments used for hedging of mortgage servicing rights	942,005	125,695
Purchase of mortgage servicing rights	(24,104)	(211,481)
Purchase of furniture, fixtures, equipment and leasehold improvements	(994)	(2,126)
Acquisition of capitalized software	(14,108)	(6,750)
Decrease in margin deposits	132,953	28,343
Net cash provided by (used in) investing activities	1,116,225	(92,771)
Cash flow from financing activities
Sale of assets under agreements to repurchase	20,510,531	8,382,013
Repurchase of assets sold under agreements to repurchase	(20,205,416)	(8,164,625)
Issuance of mortgage loan participation purchase and sale certificates	5,273,329	5,555,946
Repayment of mortgage loan participation purchase and sale certificates	(5,242,527)	(5,540,374)
Repayments of obligations under capital lease	(2,665)	(1,514)
Repayment of excess servicing spread financing	(9,308)	(10,552)
Payment of debt issuance costs	(3,388)	(1,536)
Issuance of common stock pursuant to exercise of stock options	3,082	1,283
Repurchase of common stock	(4,121)
Payment of withholding taxes relating to stock-based compensation	(5,265)	(4,634)
Payment of dividend to holders of common stock	(9,733)
Net cash provided by (used in) financing activities	304,519	216,007
Net increase (decrease) in cash and restricted cash	690,460	(11,011)
Cash and restricted cash at beginning of quarter	188,578	155,924
Cash and restricted cash at end of quarter	879,038	144,913
Cash	878,826	144,266
Restricted cash included in Other assets	212	647
PMT
Adjustments to reconcile net income to net cash used in operating activities:
Accrual of interest on excess servicing spread financing payable to PennyMac Mortgage Investment Trust	1,974	3,066
Change in fair value of investment in common shares of PennyMac Mortgage Investment Trust	875	(156)
Purchase of loans held for sale from PennyMac Mortgage Investment Trust	(14,509,209)	(6,959,389)
Sale of loans held for sale to Penny Mac Mortgage Investment Trust	2,246,127	884,510
(Increase) decrease in receivable from affiliates	(10,133)	2,775
Decrease in payable to affiliate	(17,019)	(28,752)
Increase in income taxes payable	108,474	14,090
Cash flow from investing activities
Net change in assets purchased from PMT under agreement to resell	$ 7,746	$ 5,096