PennyMac Mortgage Investment Trust (PMT) 10-Q7 May 212021 Q1 Quarterly reportFinancial data

Company Profile

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2021	May 06, 2021
Document And Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Entity Registrant Name	PennyMac Mortgage Investment Trust
Entity Central Index Key	0001464423
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Current Reporting Status	Yes
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		97,938,350
Entity File Number	001-34416
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	27-0186273
Entity Address, Address Line One	3043 Townsgate Road
Entity Address, City or Town	Westlake Village
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	91361
City Area Code	818
Local Phone Number	224-7442
Entity Interactive Data Current	Yes
Document Quarterly Report	true
Document Transition Report	false
Common Stock [Member]
Document And Entity Information [Line Items]
Title of 12(b) Security	Common Shares of Beneficial Interest, $0.01 Par Value
Trading Symbol	PMT
Security Exchange Name	NYSE
Security Exchange Name	NYSE
8.125% Series A Preferred Stock [Member]
Document And Entity Information [Line Items]
Title of 12(b) Security	8.125% Series A Cumulative Redeemable PreferredShares of Beneficial Interest, $0.01 Par Value
Trading Symbol	PMT/PA
Security Exchange Name	NYSE
Security Exchange Name	NYSE
8.00% Series B Preferred Stock [Member]
Document And Entity Information [Line Items]
Title of 12(b) Security	8.00% Series B Cumulative Redeemable PreferredShares of Beneficial Interest, $0.01 Par Value
Trading Symbol	PMT/PB
Security Exchange Name	NYSE
Security Exchange Name	NYSE

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
ASSETS
Cash	$ 92,842	$ 57,704
Short-term investments at fair value	108,375	127,295
Mortgage-backed securities at fair value pledged to creditors	1,916,485	2,213,922
Loans acquired for sale at fair value ($4,590,193 and $3,501,847 pledged to creditors, respectively)	4,646,761	3,551,890
Loans at fair value ($111,228 and $147,410 pledged to creditors, respectively)	117,647	151,734
Excess servicing spread purchased from PennyMac Financial Services, Inc. at fair value pledged to secure Assets sold to PennyMac Financial Services, Inc. under agreements to repurchase	0	131,750
Derivative and credit risk transfer strip assets ($58,134 and $58,699 pledged to creditors, respectively)	182,969	164,318
Deposits securing credit risk transfer arrangements pledged to creditors	2,664,420	2,799,263
Mortgage servicing rights at fair value ($2,423,063 and $1,742,905 pledged to creditors, respectively)	2,441,214	1,755,236
Servicing advances ($74,522 pledged to creditors at March 31, 2021)	150,160	121,820
Real estate acquired in settlement of loans ($10,250 and $15,365 pledged to creditors, respectively)	17,715	28,709
Other	176,145	380,218
Total assets	12,522,254	11,492,011
LIABILITIES
Assets sold under agreements to repurchase	6,091,973	6,309,418
Mortgage loan participation purchase and sale agreements	68,176	16,851
Notes payable secured by credit risk transfer and mortgage servicing assets	2,897,794	1,924,999
Exchangeable senior notes	494,097	196,796
Asset-backed financing of a variable interest entity at fair value	101,238	134,726
Interest-only security payable at fair value	18,922	10,757
Derivative and credit risk transfer strip liabilities at fair value	229,970	263,473
Accounts payable and accrued liabilities	122,837	124,809
Income taxes payable	42,493	23,563
Liability for losses under representations and warranties	28,967	21,893
Total liabilities	10,165,111	9,195,152
Commitments and contingencies ─ Note 16
SHAREHOLDERS’ EQUITY
Preferred shares of beneficial interest, $0.01 par value per share, authorized 100,000,000 shares, issued and outstanding 12,400,000 shares, liquidation preference $310,000,000	299,707	299,707
Common shares of beneficial interest—authorized, 500,000,000 common shares of $0.01 par value; issued and outstanding, 97,938,350 and 97,862,625 common shares, respectively	979	979
Additional paid-in capital	2,137,933	2,096,907
Accumulated deficit	(81,476)	(100,734)
Total shareholders’ equity	2,357,143	2,296,859
Total liabilities and shareholders’ equity	12,522,254	11,492,011
Variable Interest Entities [Member]
ASSETS
Loans at fair value ($111,228 and $147,410 pledged to creditors, respectively)	109,845	143,707
Derivative and credit risk transfer strip assets ($58,134 and $58,699 pledged to creditors, respectively)	58,134	58,699
Deposits securing credit risk transfer arrangements pledged to creditors	2,664,420	2,799,263
Other—interest receivable	298	392
Total assets	2,832,697	3,002,061
LIABILITIES
Asset-backed financing of a variable interest entity at fair value	101,238	134,726
Derivative and credit risk transfer liabilities at fair value	123,028	229,696
Interest-only security payable at fair value	18,922	10,757
Accounts payable and accrued liabilities—interest payable	298	392
Total liabilities	243,486	375,571
PennyMac Financial Services, Inc. [Member]
ASSETS
Due from PennyMac Financial Services, Inc.	7,521	8,152
LIABILITIES
Assets sold under agreements to repurchase	0	80,862
Due to PennyMac Financial Services, Inc.	$ 68,644	$ 87,005

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Loans acquired for sale at fair value, pledged to creditors	$ 4,590,193	$ 3,501,847
Loans at fair value, pledged to creditors	111,228	147,410
Derivative assets, pledged to creditors	58,134	58,699
Mortgage servicing rights pledged to creditors	2,423,063	$ 1,742,905
Servicing Advances pledged to creditors	$ 74,522
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, shares issued	12,400,000	12,400,000
Preferred stock, shares outstanding	12,400,000	12,400,000
Preferred stock, liquidation preference, value	$ 310,000	$ 310,000
Common shares, authorized	500,000,000	500,000,000
Common shares, par value	$ 0.01	$ 0.01
Common shares, issued	97,938,350	97,938,350
Common shares, outstanding	97,862,625	97,862,625
Real Estate Acquired in Satisfaction of Debt [Member]
Real estate pledged to creditors	$ 10,250	$ 15,365

Consolidated Statements of Oper

Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net investment income (loss)
Net gain on loans acquired for sale	$ 53,012	$ 48,775
Loan origination fees	52,902	23,928
Net gain (loss) on investments	83,191	(815,131)
Contractually specified	116,287	94,469
Net mortgage loan servicing fees	132,532	101,660
Change in fair value of mortgage servicing rights	278,282	(627,201)
Mortgage servicing rights hedging results	(374,403)	767,186
Net servicing fees from non-affiliates	50,045	244,572
Interest income	37,589	72,123
Interest expense	76,308	81,068
Net interest expense	(38,719)	(8,945)
Results of real estate acquired in settlement of loans	837	32
Other	129	252
Net investment income (loss)	201,397	(506,517)
Expenses
Management fees	8,449	9,055
Loan origination	9,308	4,249
Loan collection and liquidation	3,857	750
Professional services	2,224	1,496
Compensation	2,185	519
Safekeeping	1,941	1,658
Other	2,477	3,720
Total expenses	110,369	77,908
Income (loss) before provision for income taxes	91,028	(584,425)
Provision for income taxes	19,425	10,248
Net income (loss)	71,603	(594,673)
Dividends on preferred shares	6,234	6,234
Net income (loss) attributable to common shareholders	$ 65,369	$ (600,907)
Earnings (loss) per common share
Basic	$ 0.67	$ (5.99)
Diluted	$ 0.67	$ (5.99)
Weighted average common shares outstanding
Basic	97,892	100,245
Diluted	98,103	100,245
Dividends declared per common share	$ 0.47	$ 0.25
Nonaffiliates [Member]
Net investment income (loss)
Net gain on loans acquired for sale	$ 51,274	$ 44,614
Net gain (loss) on investments	81,540	(800,990)
Other	16,245	7,191
Net servicing fees from non-affiliates	36,411	241,645
Interest income	36,309	70,149
Interest expense	75,921	79,850
PennyMac Financial Services, Inc. [Member]
Net investment income (loss)
Net gain on loans acquired for sale	1,738	4,161
Net gain (loss) on investments	1,651	(14,141)
From PennyMac Financial Services, Inc.	13,634	2,927
Interest income	1,280	1,974
Interest expense	387	1,218
Expenses
Loan fulfillment fees	60,835	41,940
Loan servicing fees	19,093	14,521
Management fees	$ 8,449	$ 9,055

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Preferred Shares [Member]	Common Shares [Member]	Additional Paid-in Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]
Balance, Amount at Dec. 31, 2019	$ 2,450,915	$ 299,707	$ 1,002	$ 2,127,889	$ 22,317
Balance, Shares at Dec. 31, 2019		12,400	100,182
Net income (loss)	(594,673)	$ 0	$ 0	0	(594,673)
Share-based compensation, Amount	(1,443)	0	$ 2	(1,445)	0
Share-based compensation, Shares			201
Issuance of common shares, Amount	5,654	0	$ 2	5,652	0
Issuance of common shares, Shares			241
Issuance costs relating to common shares	(57)	0	$ 0	(57)	0
Dividends:
Preferred shares dividends	(6,236)	0	0	0	(6,236)
Common share dividends	(25,009)	0	0	0	(25,009)
Repurchase of common shares, Amount	$ (5,783)	0	$ (8)	(5,775)	0
Repurchase of common shares, Shares	(783)		(783)
Balance, Amount at Mar. 31, 2020	$ 1,823,368	$ 299,707	$ 998	2,126,264	(603,601)
Balance, Shares at Mar. 31, 2020		12,400	99,841
Balance, Amount at Dec. 31, 2020	2,296,859	$ 299,707	$ 979	2,096,907	(100,734)
Balance, Shares at Dec. 31, 2020		12,400	97,863
Net income (loss)	71,603	$ 0	$ 0	0	71,603
Share-based compensation, Amount	1,040	0	$ 0	1,040	0
Share-based compensation, Shares			75
Recognition of cash conversion option included in issuance of Exchangeable Notes, Amount	39,986	0	$ 0	39,986	0
Recognition of cash conversion option included in issuance of Exchangeable Notes, Shares			0
Dividends:
Preferred shares dividends	(6,236)	0	$ 0	0	(6,236)
Common share dividends	(46,109)	0	0	0	(46,109)
Balance, Amount at Mar. 31, 2021	$ 2,357,143	$ 299,707	$ 979	$ 2,137,933	$ (81,476)
Balance, Shares at Mar. 31, 2021		12,400	97,938

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Dividends declared per common share	$ 0.47	$ 0.25
Retained Earnings (Accumulated Deficit) [Member]
Dividends declared per common share	$ 0.47	$ 0.25

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities
Net income (loss)	$ 71,603	$ (594,673)
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Net gains on loans acquired for sale at fair value	(53,012)	(48,775)
Net (gains) losses on investments	(83,191)	815,131
Change in fair value of mortgage servicing rights	(278,282)	627,201
Mortgage servicing rights hedging results	374,403	(767,186)
Capitalization of interest and fees on loans at fair value	(198)	0
Accrual of unearned discounts and amortization of purchase premiums on mortgage-backed securities, loans at fair value, and asset-backed financing of a VIE	909	14,200
Amortization of debt issuance costs	7,384	3,127
Results of real estate acquired in settlement of loans	(837)	(32)
Share-based compensation expense	1,738	186
Purchase of loans acquired for sale at fair value from nonaffiliates	(53,234,735)	(30,919,685)
Sale to nonaffiliates and repayment of loans acquired for sale at fair value	33,318,157	19,718,151
Repurchase of loans subject to representation and warranties	(16,094)	(9,919)
(Increase) decrease in servicing advances	(28,686)	9,661
(Increase) decrease in other assets	(366,695)	607,581
Decrease in accounts payable and accrued liabilities	(1,988)	(28,355)
Increase in income taxes payable	18,930	10,248
Net cash (used in) provided by operating activities	(1,869,255)	1,705,250
Cash flows from investing activities
Net decrease (increase) in short-term investments	18,920	(47,124)
Purchase of mortgage-backed securities at fair value	(1,259,189)	(1,615,486)
Sale and repayment of mortgage-backed securities at fair value	1,482,986	611,664
Repurchase of loans at fair value	0	(1,058)
Sale and repayment of loans at fair value	32,926	15,824
Net settlement of derivative financial instruments	4,820	(32,452)
Distribution from credit risk transfer agreements	190,943	145,801
Sale of real estate acquired in settlement of loans	12,111	15,943
Decrease in margin deposits	312,741	293,620
Net cash provided by (used in) investing activities	930,882	(603,960)
Cash flows from financing activities
Sale of assets under agreements to repurchase	56,191,062	42,128,403
Repurchase of assets sold under agreements to repurchase	(56,410,371)	(42,429,163)
Issuance of mortgage loan participation purchase and sale agreements	1,305,282	1,222,959
Repayment of mortgage loan participation purchase and sale agreements	(1,253,957)	(1,222,959)
Issuance of notes payable secured by credit risk transfer and mortgage servicing assets	659,156	350,000
Repayment of notes payable secured by credit risk transfer and mortgage servicing assets	(130,387)	(79,011)
Advances under notes payable secured by mortgage servicing assets	887,971	0
Repayment under secured notes payable secured by mortgage servicing assets	(437,970)	0
Issuance of Exchangeable Notes	345,000	0
Repayment of asset-backed financing of a variable interest entity at fair value	(31,798)	(11,358)
Payment of debt issuance costs	(16,588)	(1,771)
Payment of contingent underwriting fees	0	(76)
Payment of dividends to preferred shareholders	(6,236)	(6,236)
Payment of dividends to common shareholders	(46,093)	(47,193)
Issuance of common shares	0	5,654
Payment of issuance costs related to common shares	0	(57)
Payment of vested share-based compensation withholdings	(698)	(1,629)
Repurchase of common shares	0	(5,783)
Net cash provided by (used in) financing activities	973,511	(105,966)
Net increase in cash	35,138	995,324
Cash at beginning of quarter	57,704	104,056
Cash at end of quarter	92,842	1,099,380
PennyMac Loan Services, LLC [Member]
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Accrual of interest on excess servicing spread purchased from PennyMac Financial Services, Inc.	(1,280)	(1,974)
Purchase of loans acquired for sale at fair value from PennyMac Financial Services, Inc.	0	(2,246,127)
Sale of loans acquired for sale to PennyMac Financial Services, Inc.	18,420,614	14,509,209
Decrease (increase) in due from PennyMac Financial Services, Inc.	688	(750)
(Decrease) increase in due to PennyMac Financial Services, Inc.	(18,683)	8,031
Cash flows from investing activities
Repayment of excess servicing spread receivable from PennyMac Financial Services, Inc.	134,624	9,308
Cash flows from financing activities
Repurchase of assets sold to PennyMac Financial Services, Inc. under agreement to repurchase	$ (80,862)	$ (7,746)

Organization

Organization	3 Months Ended
Organization	Mar. 31, 2021
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Organization	Note 1—Organization PennyMac Mortgage Investment Trust (“PMT” or the “Company”) is a specialty finance company, which, through its subsidiaries (all of which are wholly-owned), invests primarily in residential mortgage-related assets. The Company operates in four segments: credit sensitive strategies, interest rate sensitive strategies, correspondent production, and corporate: • The credit sensitive strategies segment represents the Company’s investments in credit risk transfer (“CRT”) arrangements, including CRT agreements (“CRT Agreements”) and CRT securities (together, “CRT arrangements”), distressed loans, real estate, and non-Agency subordinated bonds. • The interest rate sensitive strategies segment represents the Company’s investments in mortgage servicing rights (“MSRs”), excess servicing spread (“ESS”) purchased from PennyMac Financial Services, Inc. (“PFSI”), Agency and senior non-Agency mortgage-backed securities (“MBS”) and the related interest rate hedging activities. • The correspondent production segment represents the Company’s operations aimed at serving as an intermediary between lenders and the capital markets by purchasing, pooling and reselling newly originated prime credit quality loans either directly or in the form of MBS, using the services of PNMAC Capital Management, LLC (“PCM” or the “Manager”) and PennyMac Loan Services, LLC (“PLS”), both indirect controlled subsidiaries of PFSI. The Company primarily sells the loans it acquires through its correspondent production activities to government-sponsored entities such as the Federal National Mortgage Association (“Fannie Mae”) and the Federal Home Loan Mortgage Corporation (“Freddie Mac”) or to PLS for sale into securitizations guaranteed by the Government National Mortgage Association (“Ginnie Mae”). Fannie Mae, Freddie Mac and Ginnie Mae are each referred to as an “Agency” and, collectively, as the “Agencies.” • The corporate segment includes management fees, corporate expense amounts and certain interest income. The Company conducts substantially all of its operations and makes substantially all of its investments through its subsidiary, PennyMac Operating Partnership, L.P. (the “Operating Partnership”), and the Operating Partnership’s subsidiaries. A wholly-owned subsidiary of the Company is the sole general partner, and the Company is the sole limited partner, of the Operating Partnership. The Company believes that it qualifies, and has elected to be taxed, as a real estate investment trust (“REIT”) under the Internal Revenue Code of 1986, as amended. To maintain its tax status as a REIT, the Company is required to distribute at least 90% of its taxable income in the form of qualifying distributions to shareholders.

Basis of Presentation and Accou

Basis of Presentation and Accounting Change	3 Months Ended
Basis of Presentation and Accounting Change	Mar. 31, 2021
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Basis of Presentation and Accounting Change	Note 2—Basis of Presentation and Accounting Change Basis of Presentation The Company’s consolidated financial statements have been prepared in compliance with accounting principles generally accepted in the United States (“GAAP”) as codified in the Financial Accounting Standards Board’s (“FASB”) Accounting Standards Codification These unaudited consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the financial position, results of operations, and cash flows for the interim periods presented, but are not necessarily indicative of the results of operations that may be anticipated for the full year. Intercompany accounts and transactions have been eliminated. Preparation of financial statements in compliance with GAAP requires the Company to make estimates and judgments that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements, and revenues and expenses during the reporting period. Actual results will likely differ from those estimates. The Company held no restricted cash during the periods presented. Therefore, the consolidated statements of cash flows do not include references to restricted cash. Pending Accounting Change In August 2020, the FASB issued Accounting Standards Update 2020-06, Debt – Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging – Contracts in Entity’s Own Equity (Subtopic 815-40) Debt – Debt with Conversion and Other Options • the embedded conversion features in debt instruments no longer are separated from the host contract for convertible instruments with conversion features that are not required to be accounted for as derivatives or that do not result in substantial premiums accounted for as paid-in capital. Consequently, a convertible debt instrument will generally be accounted for as a single liability measured at its amortized cost; • Diluted earnings per share guidance is changed to require that: • an entity is required to include shares issuable pursuant to conversion of convertible debt instruments in the determination of diluted earnings per share; current guidance allows an entity to exclude such shares from the diluted earnings per share calculation if the company has a history and policy of cash settlement; • an average market price should be used to calculate the diluted EPS denominator in cases in which the exercise prices may change on the basis of an entity’s share price or changes in the entity’s share price may affect the number of shares that may be used to settle a financial instrument; and • an entity should use the weighted-average share count from each quarter when calculating the year-to-date weighted-average share count. ASU 2020-06 is effective for the Company beginning in the quarter ending March 31, 2022 with early adoption allowed beginning in the quarter ending March 31, 2021 using either the modified retrospective or full retrospective method. The Company intends to adopt ASU 2020-06 beginning in the quarter ending March 31, 2022. As detailed in Note 14 – Long-Term Debt • The exchange feature included in the Exchangeable Notes can be settled either in cash or common shares at the option of PennyMac Corp. (“PMC”). As a result of this feature and PMT’s intent to cash settle the Exchangeable Notes, the Company presently excludes the effect of exchange of the Exchangeable Notes from diluted earnings per share as allowed under current accounting standards. Adoption of ASU 2020-06 will require the Company to include common shares issuable pursuant to exchange of the Exchangeable Notes in its determination of diluted earnings per share. • The Company recognized the fair value of the exchange feature as a component of Additional paid-in capital as of the date of issuance of the Exchangeable Notes as required by current guidance. The issuance discount charged to the Exchangeable Notes resulting from the allocation of the issuance discount to Additional paid-in capital is presently accrued to interest expense using the interest method. Upon adoption of ASU 2020-06, the value originally attributed to Additional paid-in capital as of the date of issuance of the Exchangeable Notes will be added to the carrying value of the Exchangeable Notes and the accumulated accrual of the exchange value to interest expense through the date of adoption of ASU 2020-06 will be credited to retained earnings net of income taxes as the cumulative effect of the adoption of ASU 2020-06.

Concentration of Risks

Concentration of Risks	3 Months Ended
Concentration of Risks	Mar. 31, 2021
Risks And Uncertainties [Abstract]
Concentration of Risks	Note 3—Concentration of Risks As discussed in Note 1— Organization Credit Risk Note 6 – Variable Interest Entities • through May 2018, entering into CRT Agreements, whereby it retains a portion of the credit risk underlying such loans as part of the retention of an interest-only (“IO”) ownership interest in such loans and an obligation to absorb scheduled credit losses arising from such loans reaching a specific number of days delinquent (“Recourse Obligations”); or • from June 2018 through 2020, entering into firm commitments to purchase and purchasing CRT securities and, upon purchase of such securities, holding CRT strips representing an IO ownership interest that absorbs realized credit losses arising from such loans . The Company’s retention of credit risk through its investment in CRT arrangements subjects it to risks associated with delinquency and foreclosure similar to the risks of loss associated with owning the underlying loans, which is greater than the risk of loss associated with selling such loans to Fannie Mae without the retention of such credit risk. CRT Agreements are structured such that loans that reach a specific number of days delinquent (including loans in forbearance which also includes those subject to the forbearance provided in the Coronavirus Aid, Relief, and Economic Security Act (“CARES Act”)) trigger losses chargeable to the CRT Agreements based on the size of the loan and a contractual schedule of loss severity. Therefore, the risks associated with delinquency and foreclosure may in some instances be greater than the risks associated with owning the related loans because the structure of the CRT Agreements provides that the Company may be required to absorb losses in the event of delinquency or foreclosure even when there is ultimately no loss realized with respect to such loans (e.g., as a result of a borrower’s re-performance). In contrast, the structure of the Company’s investment in CRT strips requires PMT to absorb losses only when the reference loans realize actual losses. Fair Value Risk The Company is exposed to fair value risk in addition to the risks specific to credit and, as a result of prevailing market conditions or the economy generally, may be required to recognize losses associated with adverse changes to the fair value of its investments in MSRs, CRT arrangements, and MBS: • MSRs are generally subject to loss in fair value when prepayment speeds increase as a result of decreasing mortgage interest rates, when estimates of cost to service the underlying loans increase or when the returns demanded by market participants increase. • The fair value of CRT arrangements is sensitive to market perceptions of future credit performance of the underlying loans as well as the actual credit performance of such loans and to the returns required by market participants to hold such investments. • The fair value of MBS is sensitive to changes in market interest rates.

Transactions with Related parti

Transactions with Related parties	3 Months Ended
Transactions with Related parties	Mar. 31, 2021
Related Party Transactions [Abstract]
Transactions with Related parties	Note 4—Transactions with Related Parties Operating Activities Correspondent Production Activities The Company is provided fulfillment and other services by PLS under an amended and restated mortgage banking services agreement. Through June 30, 2020, pursuant to the terms of the agreement, the monthly fulfillment fee was an amount equal to (a) no greater than the product of (i) 0.35% and (ii) the aggregate initial unpaid principal balance (the “Initial UPB”) of all loans purchased in such month, plus (b) in the case of all loans other than loans sold to or securitized through Fannie Mae or Freddie Mac, no greater than the product of (i) 0.50% and (ii) the aggregate Initial UPB of all such loans sold and securitized in such month; provided however, that no fulfillment fee shall be due or payable to PLS with respect to any loans underwritten in accordance with the Ginnie Mae MBS Guide. The Company does not hold the Ginnie Mae approval required to issue securities guaranteed by Ginnie Mae MBS and act as a servicer. Accordingly, under the agreement, PLS currently purchases loans saleable in accordance with the Ginnie Mae MBS Guide “as is” and without recourse of any kind from the Company at cost less any administrative fees paid by the correspondent to the Company plus accrued interest and a sourcing fee, which, through June 30, 2020, ranged from two to three and one-half Effective July 1, 2020, the fulfillment fees and sourcing fees were revised as follows: • Fulfillment fees shall not exceed the following: (i) the number of loan commitments multiplied by a pull-through factor of either .99 or .80 depending on whether the loan commitments are subject to a “mandatory trade confirmation” or a “best efforts lock confirmation”, respectively, and then multiplied by $585 for each pull-through adjusted loan commitment up to and including 16,500 per quarter and $355 for each pull-through adjusted loan commitment in excess of 16,500 per quarter, plus (ii) $315 multiplied by the number of purchased loans up to and including 16,500 per quarter and $195 multiplied by the number of purchased loans in excess of 16,500 per quarter, plus (iii) $750 multiplied by the number of all purchased loans that are sold or securitized to parties other than Fannie Mae and Freddie Mac; provided however, that no fulfillment fee shall be due or payable to PLS with respect to any Ginnie Mae loans. • Sourcing fees charged to PLS range from one to two basis points, generally based on the average number of calendar days the loans are held by PMT before purchase by PLS. In consideration for the mortgage banking services provided by PLS with respect to the Company’s acquisition of mortgage loans under PLS’s early purchase program, PLS is entitled to fees accruing (i) at a rate equal to $1,500 per year per early purchase facility administered by PLS, and (ii) in the amount of $35 for each mortgage loan that the Company acquires. The mortgage banking services agreement expires, unless terminated earlier in accordance with its terms, on June 30, 2025, subject to automatic renewal for additional 18-month periods, unless terminated in accordance with its terms. The Company may purchase newly originated conforming balance non-government insured or guaranteed loans from PLS under a mortgage loan purchase and sale agreement. Following is a summary of correspondent production activity between the Company and PLS: Quarter ended March 31, 2021 2020 (in thousands) Loan fulfillment fees earned by PLS $ 60,835 $ 41,940 Sourcing fees received from PLS included in Net gain on loans acquired for sale $ 1,738 $ 4,161 UPB of loans sold to PLS $ 17,559,575 $ 13,870,280 Purchases of loans acquired for sale from PLS $ — $ 2,246,127 Tax service fees paid to PLS $ 8,192 $ 3,980 March 31, 2021 December 31, 2020 (in thousands) Loans included in Loans acquired for sale at fair value pending sale to PLS $ 327,881 $ 460,414 Loan Servicing The Company, through its Operating Partnership, has a loan servicing agreement with PLS (the “Servicing Agreement”) pursuant to which PLS provides subservicing for the Company's portfolio of MSRs (prime servicing) and its portfolio of residential loans purchased with credit deterioration (distressed loans). The Servicing Agreement provides for servicing fees earned by PLS that are established at a fixed per loan monthly amount based on whether the loans are acquired as prime servicing or distressed loans. PLS is also entitled to market-based fees and charges including boarding and deboarding fees, liquidation and disposition, assumption, modification and origination fees and a percentage of late charges relating to loans it services for the Company, as well as certain fees for COVID-19 pandemic-related forbearance and modification activities provided for under the CARES Act. The Servicing Agreement expires on June 30, 2025, subject to automatic renewal for additional 18-month periods, unless terminated earlier in accordance with its terms. Prime Servicing The base servicing fees for non-distressed loans subserviced by PLS on the Company’s behalf are based on whether the loan is a fixed-rate or adjustable-rate loan. The base servicing fees are $7.50 per month for fixed-rate loans and $8.50 per month for adjustable-rate loans. To the extent that these non-distressed loans become delinquent, PLS is entitled to an additional servicing fee per loan ranging from $10 to $55 per month and based on the delinquency, bankruptcy and foreclosure status of the loan or $75 per month if the underlying mortgaged property becomes real estate acquired in settlement of loans (“REO”). PLS is also entitled to customary ancillary income and certain market-based fees and charges, including boarding and deboarding fees, liquidation and disposition fees, assumption, modification and origination fees. Effective July 1, 2020, PLS also receives certain fees for COVID-19 pandemic-related forbearance and modification activities it provides as required by the CARES Act. Special Servicing (Distressed Loans) The base servicing fee rates for distressed whole mortgage loans are charged based on a monthly per-loan dollar amount, with the actual dollar amount for each loan based on the delinquency, bankruptcy and/or foreclosure status of such loan or whether the underlying mortgage property has become REO. The base servicing fee rates for distressed whole mortgage loans range from $30 per month for current loans up to $95 per month for loans where foreclosure proceedings have commenced. The base servicing fee rate for REO is $75 per month. To the extent that the Company rents its REO under its REO rental program, PLS is entitled to an REO rental fee of $30 per month per REO, an REO property lease renewal fee of $100 per lease renewal, and a property management fee in an amount equal to its cost if property management services and/or any related software costs are outsourced to a third-party property management firm or nine percent of gross rental income if PLS provides property management services directly. MSR Recapture Agreement The Company has an MSR recapture agreement with PFSI. Pursuant to the terms of the MSR recapture agreement, if PFSI refinances mortgage loans for which the Company previously held the MSRs, through June 30, 2020, PFSI was generally required to transfer and convey to the Company cash in an amount equal to 30% of the fair market value of the MSRs related to all such loans so originated. Effective July 1, 2020, the 2020 MSR recapture agreement changed the recapture fee payable by PLS to a tiered amount equal to: • 40% of the fair market value of the MSRs relating to the recaptured loans subject to the first 15% of the “recapture rate”; • 35% of the fair market value of the MSRs relating to the recaptured loans subject to the recapture rate in excess of 15% and up to 30%; and • 30% of the fair market value of the MSRs relating to the recaptured loans subject to the recapture rate in excess of 30%. The “recapture rate” means, during each month, the ratio of (i) the aggregate unpaid principal balance of all recaptured loans, to (ii) the aggregate unpaid principal balance of all mortgage loans for which the Company held the MSRs and that were refinanced or otherwise paid off in such month. PFSI has further agreed to allocate sufficient resources to target a recapture rate of 15%. The MSR recapture agreement expires, unless terminated earlier in accordance with its terms, on June 30, 2025, subject to automatic renewal for additional 18-month periods, unless terminated in accordance with its terms. Following is a summary of loan servicing fees earned by PLS: Quarter ended March 31, 2021 2020 (in thousands) Loan servicing fees: Loans acquired for sale at fair value $ 543 $ 536 Loans at fair value 137 300 MSRs 18,413 13,685 $ 19,093 $ 14,521 Average investment in: Loans acquired for sale at fair value $ 3,618,980 $ 3,215,418 Loans at fair value: Distressed $ 7,805 $ 11,249 Held in a VIE $ 129,122 $ 253,759 Average MSR portfolio UPB $ 177,161,626 $ 136,687,324 Management Fees The Company has a management agreement with PCM pursuant to which the Company pays PCM management fees as follows: • A base management fee that is calculated quarterly and is equal to the sum of (i) 1.5% per year of average shareholders’ equity up to $2 billion, (ii) 1.375% per year of average shareholders’ equity in excess of $2 billion and up to $5 billion, and (iii) 1.25% per year of average shareholders’ equity in excess of $5 billion. • A performance incentive fee that is calculated quarterly at a defined annualized percentage of the amount by which “net income,” on a rolling four-quarter basis and before deducting the incentive fee, exceeds certain levels of return on “equity.” The performance incentive fee is equal to the sum of: (a) 10% of the amount by which “net income” for the quarter exceeds (i) an 8% return on “equity” plus the “high watermark”, up to (ii) a 12% return on “equity”; plus (b) 15% of the amount by which “net income” for the quarter exceeds (i) a 12% return on “equity” plus the high watermark, up to (ii) a 16% return on “equity”; plus (c) 20% of the amount by which “net income” for the quarter exceeds a 16% return on “equity” plus the “high watermark”. For the purpose of determining the amount of the performance incentive fee: “Net income” is defined as net income or loss attributable to Common Shares calculated in accordance with GAAP, and adjusted to exclude one-time events pursuant to changes in GAAP and certain other non-cash charges after discussion between the Company’s Manager and the independent trustees and after approval by a majority of the Company’s independent trustees. “Equity” is the weighted average of the issue price per Common Share of all of the Company’s public offerings, multiplied by the weighted average number of Common Shares outstanding (including restricted share units) in the rolling four-quarter period. “High watermark” is the quarterly adjustment that reflects the amount by which the “net income” (stated as a percentage of return on equity) in that quarter exceeds or falls short of the lesser of 8% and the average Fannie Mae 30-year MBS yield (the target yield) for the four quarters then ended. The “high watermark” starts at zero and is adjusted quarterly. If the “net income” is lower than the target yield, the high watermark is increased by the difference. If the “net income” is higher than the target yield, the high watermark is reduced by the difference. Each time a performance incentive fee is earned, the high watermark returns to zero. As a result, the threshold amounts required for PCM to earn a performance incentive fee are adjusted cumulatively based on the performance of PMT’s “net income” over (or under) the target yield, until the “net income” in excess of the target yield exceeds the then-current cumulative “high watermark” amount. The base management fee and the performance incentive fee are both payable quarterly in arrears. The performance incentive fee may be paid in cash or a combination of cash and the Company’s common shares (subject to a limit of no more than 50% paid in Common Shares), at the Company’s option. In the event of termination of the management agreement between the Company and PCM, PCM may be entitled to a termination fee in certain circumstances. The termination fee is equal to three times the sum of (a) the average annual base management fee, and (b) the average annual performance incentive fee earned by PCM, in each case during the 24-month period before termination. Following is a summary of management fee expenses: Quarter ended March 31, 2021 2020 (in thousands) Base management $ 8,449 $ 9,055 Performance incentive — — $ 8,449 $ 9,055 Average shareholders' equity amounts used to calculate base management fee expense $ 2,310,261 $ 2,466,740 Expense Reimbursement and Amounts Payable to and Receivable from PCM Under the management agreement, PCM is entitled to reimbursement of its organizational and operating expenses, including third-party expenses, incurred on the Company’s behalf, it being understood that PCM and its affiliates shall allocate a portion of their personnel’s time to provide certain legal, tax and investor relations services for the direct benefit of the Company. PCM was reimbursed $120,000 per fiscal quarter through June 30, 2020. Effective July 1, 2020, PMT’s reimbursement of PCM’s and its affiliates’ compensation expenses was increased from $120,000 to $165,000 per fiscal quarter, such amount to be reviewed annually and to not preclude reimbursement for any other services performed by PCM or its affiliates. The Company is required to pay PCM and its affiliates a portion of rent, telephone, utilities, office furniture, equipment, machinery and other office, internal and overhead expenses of PCM and its affiliates required for the Company’s and its subsidiaries’ operations. These expenses are allocated based on the ratio of the Company’s and its subsidiaries’ proportion of gross assets compared to all remaining gross assets managed by PCM as calculated at each fiscal quarter end. Following is a summary of the Company’s reimbursements to PCM and its affiliates for expenses: Quarter ended March 31, 2021 2020 (in thousands) Reimbursement of: Common overhead incurred by PCM and its affiliates $ 571 $ 1,540 Compensation 165 120 Expenses incurred on the Company’s behalf, net 1,336 1,271 $ 2,072 $ 2,931 Payments and settlements during the quarter (1) $ 112,741 $ 33,683 (1) Payments and settlements include payments and netting settlements made pursuant to master netting agreements between the Company and PFSI for the operating, investing and financing activities itemized in this Note. Investing Activities Spread Acquisition and MSR Servicing Agreements The Company, through a wholly-owned subsidiary, PennyMac Holdings, LLC (“PMH”), has an amended and restated master spread acquisition and MSR servicing agreement with PLS (the “Spread Acquisition Agreement”), pursuant to which the Company may purchase from PLS, from time to time, participation certificates representing beneficial ownership in ESS arising from Ginnie Mae MSRs acquired by PLS, in which case PLS generally would be required to service or subservice the related loans for Ginnie Mae. The primary purpose of the amendment and restatement was to facilitate the continued financing of the ESS owned by the Company in connection with its participation in the GNMA MSR Facility (as defined below). To the extent PLS refinances any of the loans relating to the ESS the Company has acquired, the Spread Acquisition Agreement also contains recapture provisions requiring that PLS transfer to the Company, at no cost, the ESS relating to a certain percentage of the unpaid principal balance of the newly originated loans. However, under the Spread Acquisition Agreement, in any month where the transferred ESS relating to newly originated Ginnie Mae loans is not equal to at least 90 % of the product of the excess servicing fee rate and the unpaid principal balance of the refinanced loans, PLS is also required to transfer additional ESS or cash in the amount of such shortfall. Similarly, in any month where the transferred ESS relating to modified Ginnie Mae loans is not equal to at least 90 % of the product of the excess servicing fee rate and the unpaid principal balance of the modified loans, the Spread Acquisition Agreement contains provisions that require PLS to transfer additional ESS or cash in the amount of such shortfall. To the extent the fair market value of the aggregate ESS to be transferred for the applicable month is less than $ 200,000 , PLS may, at its option, settle its recapture liability to the Company in cash in an amount equal to such fair market value in lieu of transferring such ESS . The remaining balance of the ESS was repaid during the quarter ended March 31, 2021 . Following is a summary of investing activities between the Company and PFSI: Quarter ended March 31, 2021 2020 (in thousands) ESS: Received pursuant to a recapture agreement $ 557 $ 379 Repayments $ 134,624 $ 9,308 Interest income $ 1,280 $ 1,974 Net gain (loss) included in Net gains (losses) on investments: Valuation changes $ 1,037 $ (14,522 ) Recapture income 614 381 $ 1,651 $ (14,141 ) March 31, 2021 December 31, 2020 (in thousands) Excess servicing spread purchased from PennyMac Financial Services, Inc. at fair value $ — $ 131,750 Financing Activities PFSI held 75,000 of the Company’s common shares at both March 31, 2021 and December 31, 2020. Repurchase Agreement with PLS On December 19, 2016, the Company, through PMH, entered into a master repurchase agreement with PLS (the “PMH Repurchase Agreement”), pursuant to which PMH may borrow from PLS for the purpose of financing PMH’s participation certificates representing beneficial ownership in ESS acquired from PLS under the Spread Acquisition Agreement. PLS then re-pledges such participation certificates to PNMAC GMSR ISSUER TRUST (the “Issuer Trust”) under a master repurchase agreement by and among PLS, the Issuer Trust and Private National Mortgage Acceptance Company, LLC, as guarantor (the “PC Repurchase Agreement”). The Issuer Trust was formed for the purpose of allowing PLS to finance MSRs and ESS relating to such MSRs (the “GNMA MSR Facility”). In the first quarter of 2021, PLS repurchased the ESS from PMH at fair market value, effectively terminating the borrowing arrangements allowing PMH to finance its participation certificates representing beneficial ownership in ESS. In connection with the GNMA MSR Facility, PLS pledges and/or sells to the Issuer Trust participation certificates representing beneficial interests in MSRs and ESS pursuant to the terms of the PC Repurchase Agreement. In return, the Issuer Trust (a) has issued to PLS, pursuant to the terms of an indenture, the Series 2016-MSRVF1 Variable Funding Note, dated December 19, 2016, known as the “PNMAC GMSR ISSUER TRUST MSR Collateralized Notes, Series 2016-MSRVF1” (the “VFN”), and (b) may, from time to time pursuant to the terms of any supplemental indenture, issue to institutional investors additional term notes (“Term Notes”), in each case secured on a pari passu basis by the participation certificates relating to the MSRs and ESS. The maximum principal balance of the VFN is $1 billion. Following is a summary of financing activities between the Company and PFSI: Quarter ended March 31, 2021 2020 (in thousands) Net repayments of assets sold under agreements to repurchase $ 80,862 $ 7,746 Interest expense $ 387 $ 1,218 March 31, 2021 December 31, 2020 (in thousands) Assets sold to PFSI under agreement to repurchase $ — $ 80,862 Amounts Receivable from and Payable to PFSI Amounts receivable from and payable to PFSI are summarized below: March 31, 2021 December 31, 2020 (in thousands) Due from PFSI: MSR recapture $ — $ 296 Other 7,521 7,856 $ 7,521 $ 8,152 Due to PFSI: Allocated expenses and expenses and costs paid by PFSI on PMT’s behalf $ 23,325 $ 38,142 Fulfillment fees 17,347 20,873 Correspondent production fees 12,937 13,065 Management fees 8,449 8,686 Loan servicing fees 6,586 6,213 Interest on Assets sold to PFSI under agreement to repurchase — 26 $ 68,644 $ 87,005 The Company has also transferred cash to fund loan servicing advances and REO property acquisition and preservation costs advanced on its behalf by PLS. Such amounts are included in various balance sheet items as summarized below: Balance sheet line including advance amount March 31, 2021 December 31, 2020 (in thousands) Loan servicing advances $ 150,160 $ 121,820 Real estate acquired in settlement of loans 6,788 10,334 $ 156,948 $ 132,154

Loan Sales

Loan Sales	3 Months Ended
Loan Sales	Mar. 31, 2021
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Loan Sales	Note 5—Loan Sales The following table summarizes cash flows between the Company and transferees in transfers of loans that are accounted for as sales where the Company maintains continuing involvement with the loans: Quarter ended March 31, 2021 2020 (in thousands) Cash flows: Proceeds from sales $ 33,318,157 $ 19,718,151 Loan servicing fees received net of guarantee fees $ 116,287 $ 94,469 The following table summarizes, for the dates presented, collection status information for loans that are accounted for as sales where the Company maintains continuing involvement: March 31, 2021 December 31, 2020 (in thousands) UPB of loans outstanding $ 183,271,774 $ 170,502,361 Collection Status (UPB) (1) Delinquency : 30-89 days delinquent $ 920,655 $ 1,235,981 90 or more days delinquent: Not in foreclosure $ 3,788,000 $ 4,428,915 In foreclosure $ 24,647 $ 27,494 Bankruptcy $ 154,197 $ 148,866 Custodial funds managed by the Company (2) $ 6,571,084 $ 6,086,724 Delinquent loans in COVID-19 pandemic-related forbearance: 30-89 days $ 511,015 $ 530,353 90 days or more $ 3,364,821 $ 3,123,288 (1) Includes delinquent loans in COVID-19 pandemic-related forbearance plans that were requested by borrowers seeking payment relief in accordance with the CARES Act. (2) Custodial funds include borrower and investor custodial cash accounts relating to loans serviced under mortgage servicing agreements and are not included on the Company’s consolidated balance sheets. The Company earns placement fees on certain of the custodial funds it manages on behalf of the loans’ borrowers and investors, which are included in Interest income in the Company’s consolidated statements of operations.

Variable Interest Entities

Variable Interest Entities	3 Months Ended
Variable Interest Entities	Mar. 31, 2021
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Variable Interest Entities	Note 6—Variable Interest Entities The Company is a variable interest holder in various Variable Interest Entities (“VIEs”) that relate to its investing and financing activities. Credit Risk Transfer Arrangements The Company has entered into certain loan sales arrangements pursuant to which it accepts credit risk relating to the loans sold in exchange for a portion of the interest earned on such loans. These arrangements absorb credit losses on such loans and include CRT Agreements, CRT strips and sales of loans that include firm commitments to purchase CRT securities. The Company, through its subsidiary, PMC, entered into CRT Agreements with Fannie Mae, pursuant to which PMC, through subsidiary trust entities, sold pools of loans into Fannie Mae-guaranteed securitizations while retaining Recourse Obligations as part of the retention of IO ownership interests in such loans. The transfers of loans subject to CRT arrangements were accounted for as sales. The Company placed Deposits securing CRT arrangements Deposits securing CRT arrangements The Company’s exposure to losses under its Recourse Obligations was initially established at rates ranging from 3.5% to 4.0% of the UPB of the loans sold under the CRT arrangements. As the UPB of the underlying loans subject to each CRT arrangements is reduced through repayments, the percentage exposure of each CRT arrangement will increase to maximums ranging from 4.5% to 5.0% of outstanding UPB, although the total dollar amount of exposure to losses does not increase. The final sales of loans subject to the CRT Agreements were made during May 2018. Effective in June 2018, the Company began entering into different types of CRT arrangements. Under the new arrangements, the Company sold loans subject to agreements that required the Company to purchase securities that absorb incurred credit losses on such loans. The Company recognized these purchase commitments initially as a component of Net gains on loans acquired for sale Net gains (losses) on investments The Company purchased the securities subject to the firm commitments. Similar to the CRT Agreements, the Company accounts for the deposits collateralizing these securities as Deposits securing CRT arrangements CRT strips Derivative and credit risk transfer strip assets Derivative and credit risk transfer strip liabilities. Deposits securing CRT arrangements relating to these arrangements represent the Company’s maximum contractual exposure to losses. Gains and losses on the derivatives and strips (including the IO ownership interest sold to nonaffiliates ) included in the CRT arrangements are included in Net gain s (loss es ) on investments in the consolidated statements of operations. Following is a summary of the CRT arrangements: Quarter ended March 31, 2021 2020 (in thousands) UPB of loans sold $ 14,683,055 Investments — Change in expected face amount of firm commitment to purchase CRT securities $ 554,690 Investment income (loss): Net gains on loans acquired for sale — Fair value of firm commitment to purchase CRT securities recognized upon sale of loans $ — $ (26,649 ) Net gains (losses) on investments: Derivative and CRT strips: CRT derivatives Realized 23,496 17,201 Valuation changes 12,874 (300,943 ) 36,370 (283,742 ) CRT strips Realized 32,604 14,750 Valuation changes 93,222 (229,875 ) 125,826 (215,125 ) Interest-only security payable at fair value (8,165 ) 11,575 154,031 (487,292 ) Firm commitments to purchase CRT securities — (492,513 ) 154,031 (979,805 ) Interest income — Deposits securing CRT arrangements 168 6,099 $ 154,199 $ (1,000,355 ) Net (recoveries received) payments made to settle (recoveries) losses on CRT arrangements $ (13,343 ) $ 1,517 March 31, 2021 December 31, 2020 (in thousands) Carrying value of CRT arrangements: Derivative and credit risk transfer strip assets (liabilities), net CRT derivatives $ 44,676 $ 31,795 CRT strips (109,570 ) (202,792 ) $ (64,894 ) $ (170,997 ) Deposits securing CRT arrangements $ 2,664,420 $ 2,799,263 Interest-only security payable at fair value $ 18,922 $ 10,757 CRT arrangement assets pledged to secure borrowings: Derivative and credit risk transfer assets $ 58,134 $ 58,699 Deposits securing CRT arrangements (1) $ 2,664,420 $ 2,799,263 UPB of loans — funded CRT arrangements $ 48,403,684 $ 58,697,942 Collection status (UPB): Delinquency Current $ 45,422,502 $ 54,990,381 30-89 days delinquent $ 489,284 $ 710,872 90-180 days delinquent $ 472,038 $ 693,315 180 or more days delinquent $ 2,014,310 $ 2,297,365 Foreclosure $ 5,550 $ 6,009 Bankruptcy $ 77,362 $ 75,700 Delinquent loans in COVID-19 pandemic-related forbearance: 30-89 days delinquent $ 245,592 $ 383,028 90-180 days delinquent $ 353,422 $ 546,344 180 or more days delinquent $ 1,614,170 $ 1,944,663 (1) Deposits securing credit risk transfer strip liabilities also secure $123.0 million and $229.7 million in CRT strip and CRT derivative liabilities at March 31, 2021 and December 31, 2020, respectively . Jumbo Loan Financing On September 30, 2013, the Company completed a securitization transaction in which PMT Loan Trust 2013-J1 issued $537.0 million in UPB of certificates backed by fixed-rate prime jumbo loans, at a 3.9% weighted yield. The Company includes the balance of the loans held in the trust in Loans at fair value Asset backed financing of a variable interest entity at fair value . Interest Income – from nonaffiliates Interest Expense – to nonaffiliates Following is a summary of the Company’s jumbo loan financing: Quarter ended March 31, 2021 2020 (in thousands) Interest income $ 1,899 $ 2,641 Interest expense $ 168 $ 4,527 March 31, 2021 December 31, 2020 (in thousands) Loans at fair value $ 109,845 $ 143,707 Asset-backed financing at fair value $ 101,238 $ 134,726 Certificates retained at fair value $ 8,607 $ 8,981

Fair Value

Fair Value	3 Months Ended
Fair Value	Mar. 31, 2021
Fair Value Disclosures [Abstract]
Fair Value	Note 7— Fair Value The Company’s consolidated financial statements include assets and liabilities that are measured at or based on their fair values. Measurement at or based on fair value may be on a recurring or nonrecurring basis depending on the accounting principles applicable to the specific asset or liability and whether the Company has elected to carry the item at its fair value as discussed in the following paragraphs. The Company groups its assets and liabilities at fair value in three levels, based on the markets in which the assets and liabilities are traded and the observability of the inputs used to determine fair value. These levels are: • Level 1—Quoted prices in active markets for identical assets or liabilities. • Level 2—Prices determined or determinable using other significant observable inputs. Observable inputs are inputs that other market participants would use in pricing an asset or liability and are developed based on market data obtained from sources independent of the Company. • Level 3—Prices determined using significant unobservable inputs. In situations where significant observable inputs are unavailable, unobservable inputs may be used. Unobservable inputs reflect the Company’s own judgments about the factors that market participants use in pricing an asset or liability, and are based on the best information available in the circumstances. As a result of the difficulty in observing certain significant valuation inputs affecting “Level 3” fair value assets and liabilities, the Company is required to make judgments regarding these items’ fair values. Different persons in possession of the same facts may reasonably arrive at different conclusions as to the inputs to be applied in valuing these assets and liabilities and their fair values. Such differences may result in significantly different fair value measurements. Likewise, due to the general illiquidity of some of these assets and liabilities, subsequent transactions may be at values significantly different from those reported. The Company reclassifies its assets and liabilities between levels of the fair value hierarchy when the inputs required to establish fair value at a level of the fair value hierarchy are no longer readily available, requiring the use of lower-level inputs, or when the inputs required to establish fair value at a higher level of the hierarchy become available. Fair Value Accounting Elections The Company identified all of PMT’s non-cash financial assets, its Firm commitment to purchase CRT securities The Company has also identified its Asset-backed financing of a VIE at fair value Interest-only security payable at fair value Financial Statement Items Measured at Fair Value on a Recurring Basis Following is a summary of financial statement items that are measured at fair value on a recurring basis: March 31, 2021 Level 1 Level 2 Level 3 Total (in thousands) Assets: Short-term investments $ 108,375 $ — $ — $ 108,375 Mortgage-backed securities at fair value — 1,916,485 — 1,916,485 Loans acquired for sale at fair value — 4,612,527 34,234 4,646,761 Loans at fair value — 109,845 7,802 117,647 Derivative and credit risk transfer strip assets: Call options on interest rate futures purchase contracts 992 — — 992 Put options on interest rate futures purchase contracts 18,938 — — 18,938 Forward purchase contracts — 6,687 — 6,687 Forward sale contracts — 182,192 — 182,192 MBS put options — 51,165 — 51,165 Swaption purchase contracts — 29,034 — 29,034 CRT derivatives — — 58,134 58,134 Interest rate lock commitments — — 7,552 7,552 Total derivative assets before netting 19,930 269,078 65,686 354,694 Netting — — — (171,725 ) Total derivative and credit risk transfer strip assets after netting 19,930 269,078 65,686 182,969 Mortgage servicing rights at fair value — — 2,441,214 2,441,214 $ 128,305 $ 6,907,935 $ 2,548,936 $ 9,413,451 Liabilities: Asset-backed financing of a VIE at fair value $ — $ 101,238 $ — $ 101,238 Interest-only security payable at fair value — — 18,922 18,922 Derivative and credit risk transfer strip liabilities: Put options on interest rate futures sale contracts — 6,064 — 6,064 Forward purchase contracts — 89,312 — 89,312 Forward sales contracts — 6,965 — 6,965 MBS put options — 9,657 — 9,657 CRT derivatives — — 13,458 13,458 Interest rate lock commitments — — 72,410 72,410 Total derivative liabilities before netting — 111,998 85,868 197,866 Netting — — — (77,466 ) Total derivative liabilities after netting — 111,998 85,868 120,400 Credit risk transfer strips — — 109,570 109,570 Total derivative and credit risk transfer strips liabilities — 111,998 195,438 229,970 $ — $ 213,236 $ 214,360 $ 350,130 December 31, 2020 Level 1 Level 2 Level 3 Total (in thousands) Assets: Short-term investments $ 127,295 $ — $ — $ 127,295 Mortgage-backed securities at fair value — 2,213,922 — 2,213,922 Loans acquired for sale at fair value — 3,518,015 33,875 3,551,890 Loans at fair value — 143,707 8,027 151,734 Excess servicing spread purchased from PFSI — — 131,750 131,750 Derivative and credit risk transfer strip assets: Call options on interest rate futures 3,070 — — 3,070 Put options on interest rate futures 4,742 — — 4,742 Forward purchase contracts — 72,526 — 72,526 Forward sale contracts — 92 — 92 MBS put options — 3,220 — 3,220 Swaption purchase contracts — 8,505 — 8,505 CRT derivatives — — 58,699 58,699 Interest rate lock commitments — — 72,794 72,794 Total derivative assets before netting 7,812 84,343 131,493 223,648 Netting — — — (59,330 ) Total derivative assets after netting 7,812 84,343 131,493 164,318 Mortgage servicing rights at fair value — — 1,755,236 1,755,236 $ 135,107 $ 5,959,987 $ 2,060,381 $ 8,096,145 Liabilities: Asset-backed financing of a VIE at fair value $ — $ 134,726 $ — $ 134,726 Interest-only security payable at fair value — — 10,757 10,757 Derivative liabilities: Forward purchase contracts — 17 — 17 Forward sales contracts — 122,884 — 122,884 CRT derivatives — — 26,904 26,904 Interest rate lock commitments — — 408 408 Total derivative liabilities before netting — 122,901 27,312 150,213 Netting — — — (89,532 ) Total derivative liabilities after netting — 122,901 27,312 60,681 Credit risk transfer strips — — 202,792 202,792 Total derivative and credit risk transfer strips liabilities — 122,901 230,104 263,473 $ — $ 257,627 $ 240,861 $ 408,956 The following is a summary of changes in items measured at fair value on a recurring basis using Level 3 inputs that are significant to the estimation of the fair values of the assets and liabilities at either the beginning or end of the quarters presented: Quarter ended March 31, 2021 Assets (1) Loans acquired for sale Loans at fair value Excess servicing spread CRT derivatives Interest rate lock commitments CRT strips Mortgage servicing rights Total (in thousands) Balance, December 31, 2020 $ 33,875 $ 8,027 $ 131,750 $ 31,795 $ 72,386 $ (202,792 ) $ 1,755,236 $ 1,830,277 Purchases and issuances 15,898 — — — (9,704 ) — — 6,194 Repayments and sales (16,070 ) (584 ) (134,624 ) (23,489 ) — (32,604 ) — (207,371 ) Capitalization of interest and fees — 198 1,280 — — — — 1,478 ESS received pursuant to a recapture agreement with PFSI — — 557 — — — — 557 Amounts received pursuant to sales of loans — — — — — — 407,696 407,696 Changes in fair value included in results of operations arising from: Changes in instrument- specific credit risk — — — — — — — — Other factors 531 95 1,037 36,370 (275,515 ) 125,826 278,282 166,626 531 95 1,037 36,370 (275,515 ) 125,826 278,282 166,626 Transfers: Loans from REO — 66 — — — — — 66 Interest rate lock commitments to loans acquired for sale (2) — — — — 147,975 — — 147,975 Balance, March 31, 2021 $ 34,234 $ 7,802 $ — $ 44,676 $ (64,858 ) $ (109,570 ) $ 2,441,214 $ 2,353,498 Changes in fair value recognized during the quarter relating to assets still held at March 31, 2021 $ 337 $ 81 $ — $ 12,874 $ (64,858 ) $ 93,222 $ 278,282 $ 319,938 (1) For the purpose of this table, CRT derivatives, IRLCs. and CRT strips asset and liability positions are shown net. (2) The Company had transfers among the fair value levels arising from transfers of IRLCs to loans acquired for sale at fair value upon purchase of the respective loans. Liabilities Quarter ended March 31, 2021 (in thousands) Interest-only security payable: Balance, December 31, 2020 $ 10,757 Changes in fair value included in results of operations arising from: Changes in instrument-specific credit risk — Other factors 8,165 8,165 Balance, March 31, 2021 $ 18,922 Changes in fair value recognized during the quarter relating to liability outstanding at March 31, 2021 $ 8,165 Quarter ended March 31, 2020 Assets (1) Loans acquired for sale Loans at fair value Excess servicing spread CRT derivatives Interest rate lock commitments Repurchase agreement derivatives CRT strips Firm commitment to purchase CRT securities Mortgage servicing rights Total (in thousands) Balance, December 31, 2019 $ 18,567 $ 14,426 $ 178,586 $ 115,863 $ 11,154 $ 5,275 $ 54,930 $ 109,513 $ 1,535,705 $ 2,044,019 Purchases and issuances 11,291 1,058 — — 89,919 — — — — 102,268 Repayments and sales (7,557 ) (4,335 ) (9,308 ) (18,054 ) — — (14,750 ) — — (54,004 ) Capitalization of interest — — 1,974 — — — — — — 1,974 ESS received pursuant to a recapture agreement with PFSI — — 379 — — — — — — 379 Amounts (incurred) received pursuant to sales of loans — — — — — — — (26,649 ) 248,822 222,173 Changes in fair value included in results of operations arising from: Changes in instrument- specific credit risk — — — — — — — — — — Other factors 240 (1,142 ) (14,522 ) (283,742 ) 103,645 — (215,125 ) (492,513 ) (627,201 ) (1,530,360 ) 240 (1,142 ) (14,522 ) (283,742 ) 103,645 — (215,125 ) (492,513 ) (627,201 ) (1,530,360 ) Transfers: Loans to REO — (885 ) — — — — — — — (885 ) Interest rate lock commitments to loans acquired for sale (2) — — — — (125,334 ) — — — — (125,334 ) Balance, March 31, 2020 $ 22,541 $ 9,122 $ 157,109 $ (185,933 ) $ 79,384 $ 5,275 $ (174,945 ) $ (409,649 ) $ 1,157,326 $ 660,230 Changes in fair value recognized during the quarter relating to assets still held at March 31, 2020 $ 160 $ (841 ) $ (14,522 ) $ (300,944 ) $ 79,384 $ — $ (229,875 ) $ (492,513 ) $ (627,201 ) $ (1,586,352 ) (1) For the purpose of this table, CRT derivatives, IRLCs. CRT strips, and Firm commitment to purchase CRT securities asset and liability positions are shown net. (2) The Company had transfers among the fair value levels arising from transfers of IRLCs to loans acquired for sale at fair value upon purchase of the respective loans. Liabilities Quarter ended March 31, 2020 (in thousands) Interest-only security payable: Balance, December 31, 2019 $ 25,709 Changes in fair value included in income arising from: Changes in instrument- specific credit risk — Other factors (11,575 ) (11,575 ) Balance, March 31, 2020 $ 14,134 Changes in fair value recognized during the quarter relating to liability outstanding at March 31, 2020 $ (11,575 ) Financial Statement Items Measured at Fair Value under the Fair Value Option Following are the fair values and related principal amounts due upon maturity of loans accounted for under the fair value option (including loans acquired for sale, loans held in a consolidated VIE, and distressed loans): March 31, 2021 December 31, 2020 Fair value Principal amount due upon maturity Difference Fair value Principal amount due upon maturity Difference (in thousands) Loans acquired for sale at fair value: Current through 89 days delinquent $ 4,639,977 $ 4,568,613 $ 71,364 $ 3,545,100 $ 3,377,970 $ 167,130 90 or more days delinquent: Not in foreclosure 6,589 7,306 (717 ) 6,591 8,006 (1,415 ) In foreclosure 195 235 (40 ) 199 235 (36 ) 6,784 7,541 (757 ) 6,790 8,241 (1,451 ) $ 4,646,761 $ 4,576,154 $ 70,607 $ 3,551,890 $ 3,386,211 $ 165,679 Loans at fair value: Loans held in a consolidated VIE: Current through 89 days delinquent $ 107,468 $ 101,015 $ 6,453 $ 140,052 $ 128,787 $ 11,265 90 or more days delinquent: Not in foreclosure 2,377 2,885 (508 ) 3,655 4,240 (585 ) In foreclosure — — — — — — 2,377 2,885 (508 ) 3,655 4,240 (585 ) 109,845 103,900 5,945 143,707 133,027 10,680 Distressed loans: Current through 89 days delinquent 2,460 4,336 (1,876 ) 2,071 4,099 (2,028 ) 90 or more days delinquent: Not in foreclosure 3,074 10,807 (7,733 ) 3,714 12,357 (8,643 ) In foreclosure 2,268 5,634 (3,366 ) 2,242 4,641 (2,399 ) 5,342 16,441 (11,099 ) 5,956 16,998 (11,042 ) 7,802 20,777 (12,975 ) 8,027 21,097 (13,070 ) $ 117,647 $ 124,677 $ (7,030 ) $ 151,734 $ 154,124 $ (2,390 ) Following are the changes in fair value included in current period results of operations by consolidated statement of operations line item for financial statement items accounted for under the fair value option: Quarter ended March 31, 2021 Net gains on loans acquired for sale Net gains (losses) on investments Net loan servicing fees Net interest (expense) income Total (in thousands) Assets: Mortgage-backed securities at fair value $ — $ (71,117 ) $ — $ (2,523 ) $ (73,640 ) Credit risk transfer strips — 125,826 — — 125,826 Loans acquired for sale at fair value (106,664 ) — — — (106,664 ) Loans at fair value — (2,250 ) — 825 (1,425 ) ESS at fair value — 1,037 — 1,280 2,317 MSRs at fair value — — 278,282 — 278,282 $ (106,664 ) $ 53,496 $ 278,282 $ (418 ) $ 224,696 Liabilities: Interest-only security payable at fair value $ — $ (8,165 ) $ — $ — $ (8,165 ) Asset-backed financing of a VIE at fair value — 900 — 789 1,689 $ — $ (7,265 ) $ — $ 789 $ (6,476 ) Quarter ended March 31, 2020 Net gains on loans acquired for sale Net gains (losses) on investments Net loan servicing fees Net interest (expense) income Total (in thousands) Assets: Mortgage-backed securities at fair value $ — $ 115,967 $ — $ (12,002 ) $ 103,965 Loans acquired for sale at fair value 147,558 — — — 147,558 Loans at fair value — (4,010 ) — 293 (3,717 ) ESS at fair value — (14,522 ) — 1,974 (12,548 ) Credit risk transfer strips — (215,125 ) — — (215,125 ) Firm commitment to purchase CRT securities at fair value (26,649 ) (492,513 ) — — (519,162 ) MSRs at fair value — — (627,201 ) — (627,201 ) $ 120,909 $ (610,203 ) $ (627,201 ) $ (9,735 ) $ (1,126,230 ) Liabilities: Interest-only security payable at fair value $ — $ 11,575 $ — $ — $ 11,575 Asset-backed financing of a VIE at fair value — 1,928 — (2,491 ) (563 ) $ — $ 13,503 $ — $ (2,491 ) $ 11,012 Financial Statement Item Measured at Fair Value on a Nonrecurring Basis Following is a summary of the carrying value of assets that were re-measured during the quarter based on fair value on a nonrecurring basis: Real estate acquired in settlement of loans Level 1 Level 2 Level 3 Total (in thousands) March 31, 2021 $ — $ — $ 11,161 $ 11,161 December 31, 2020 $ — $ — $ 12,656 $ 12,656 The following table summarizes the fair value changes recognized during the quarter on assets held at quarter end that were remeasured at fair value on a nonrecurring basis: Quarter ended March 31, 2021 2020 (in thousands) Real estate asset acquired in settlement of loans $ (649 ) $ (1,191 ) The Company remeasures its REO based on fair value when it evaluates the REO for impairment. The Company evaluates its REO for impairment with reference to the respective properties’ fair values less cost to sell. REO may be revalued after acquisition due to the Company receiving greater access to the property, the property being held for an extended period or receiving indications that the property’s fair value may not be supported by developing market conditions. Any subsequent change in fair value to a level that is less than or equal to the property’s cost is recognized in Results of real estate acquired in settlement of loans Fair Value of Financial Instruments Carried at Amortized Cost Most of the Company’s borrowings are carried at amortized cost. The Company’s Assets sold under agreements to repurchase Mortgage loan participation purchase and sale agreements Notes payable secured by credit risk transfer and mortgage servicing assets, Exchangeable senior notes, Assets sold to PennyMac Financial Services, Inc. under agreements to repurchase The Company has concluded that the fair values of these borrowings other than Notes payable secured by credit risk transfer and mortgage servicing assets Exchangeable senior notes Following are the fair values of the Notes payable secured by credit risk transfer and mortgage servicing assets Exchangeable senior notes March 31, 2021 December 31, 2020 Instrument Carrying value Fair value Carrying value Fair value (in thousands) Notes payable secured by credit risk transfer and mortgage servicing assets $ 2,897,794 $ 2,803,523 $ 1,924,999 $ 1,871,276 Exchangeable senior notes $ 494,097 $ 563,526 $ 196,796 $ 207,428 The fair value of the Notes payable secured by credit risk transfer and mortgage servicing assets Exchangeable senior notes Valuation Governance Most of the Company’s assets, its Asset-backed financing of a VIE at fair value, Interest-only security payable at fair value Derivative and credit risk transfer strip liabilities Due to the difficulty in estimating the fair values of “Level 3” fair value assets and liabilities, the Company has assigned responsibility for estimating the fair value of these assets and liabilities to specialized staff and subjects the valuation process to significant senior management oversight. PFSI’s Financial Analysis and Valuation group (the “FAV group”) is responsible for estimating the fair values of “Level 3” fair value assets and liabilities other than IRLCs and maintaining its valuation policies and procedures. The fair value of the Company’s IRLCs is developed by PFSI’s Capital Markets Risk Management staff and is reviewed by the PFSI’s Capital Markets Operations group. With respect to the non-IRLC “Level 3” valuations, the FAV group reports to PFSI’s senior management valuation committee, which oversees the valuations. The FAV group monitors the models used for valuation of the Company’s “Level 3” fair value assets and liabilities other than IRLCs, including the models’ performance versus actual results, and reports those results to PFSI’s senior management valuation committee. PFSI’s senior management valuation committee includes the Company’s chief operating, financial, investment, and risk officers as well as other senior members of the Company’s finance, capital markets and risk management staffs. The FAV group is responsible for reporting to PFSI’s senior management valuation committee on the changes in the valuation of the non-IRLC “Level 3” fair value assets and liabilities, including major factors affecting the valuation and any changes in model methods and inputs. To assess the reasonableness of its valuations, the FAV group presents an analysis of the effect on the valuation of changes to the significant inputs to the models. Valuation Techniques and Inputs The following is a description of the techniques and inputs used in estimating the fair values of “Level 2” and “Level 3” fair value assets and liabilities: Mortgage-Backed Securities The Company categorizes its current holdings of MBS as “Level 2” fair value assets. Fair value of these MBS is established based on quoted market prices for the Company’s MBS holdings or similar securities. Changes in the fair value of MBS are included in Net gains (losses) on investments Loans Fair value of loans is estimated based on whether the loans are saleable into active markets: • Loans that are saleable into active markets, comprised of most of the Company’s loans acquired for sale at fair value and all of the loans at fair value held in a VIE, are categorized as “Level 2” fair value assets: • For loans acquired for sale, the fair values are established using the loans’ contracted selling price or quoted market price or market price equivalent. • For the loans at fair value held in a VIE, the quoted indications of fair value of all of the individual securities issued by the securitization trust are used to derive a fair value for the loans. The Company obtains indications of fair value from nonaffiliated brokers based on comparable securities and validates the brokers’ indications of fair value using pricing models and inputs the Company believes are similar to the models and inputs used by other market participants. • Loans that are not saleable into active markets, comprised of previously sold loans that the Company repurchased pursuant to the representation and warranties it provided to the purchaser and distressed loans, are categorized as “Level 3” fair value assets: • For loans acquired for sale categorized as “Level 3” fair value assets, fair values are estimated using a discounted cash flow approach. Inputs to the discounted cash flow model include current interest rates, loan amount, payment status, property type, discount rates and forecasts of future interest rates, home prices, prepayment speeds, default speeds, loss severities or contracted selling price when applicable. • Distressed loan fair values are estimated based on the expected resolution to be realized from the individual asset’s disposition strategy. When a cash flow projection is used to estimate the fair value of the resolution, those cash flows are discounted at annual rates up to 20%. Excess Servicing Spread Purchased from PFSI The Company categorizes ESS as a “Level 3” fair value asset. The Company uses a discounted cash flow approach to estimate the fair value of ESS. The key inputs used in the estimation of the fair value of ESS include pricing spread (discount rate) and prepayment speed. Significant changes to those inputs in isolation may result in a significant change in the ESS fair value measurement. Changes in these key inputs are not directly related. Changes in the fair value of ESS are included in Net gains (losses) on investments in the consolidated statements of . The remaining balance of the ESS was repaid during the quarter ended March 31, 2021. Following are the key inputs used in determining the fair value of ESS: December 31, 2020 Fair value (in thousands) $ 131,750 UPB of underlying loans (in thousands) $ 15,833,050 Average servicing fee rate (in basis points) 34 Average ESS rate (in basis points) 19 Key inputs (1) Pricing spread (2) Range 4.9% – 5.3% Weighted average 5.1% Annual total prepayment speed (3) Range 9.6% – 18.3% Weighted average 11.7% Equivalent life (in years) Range 2.3 - 6.6 Weighted average 5.8 (1) Weighted-average inputs are based on UPB of the underlying loans. (2) Pricing spread represents a margin that is applied to a reference forward rate to develop periodic discount rates. The Company applies pricing spreads to the forward rates implied by the United States Dollar London Interbank Offered Rate (“LIBOR”)/ swap curve for purposes of discounting cash flows relating to ESS. (3) Prepayment speed is measured using Life Total Conditional Prepayment Rate (“CPR”). Equivalent life is provided for informational purposes. Derivative and Credit Risk Transfer Strip Assets and Liabilities CRT Derivatives The Company categorizes CRT derivatives as “Level 3” fair value assets and liabilities. The fair value of CRT derivatives is based on indications of fair value provided to the Company by nonaffiliated brokers for the certificates representing the beneficial interests in the trust holding the Deposits securing credit risk transfer arrangements pledged to creditors Deposits securing credit risk transfer arrangements pledged to creditors The Company assesses the fair values it receives from nonaffiliated brokers using the discounted cash flow approach. The significant unobservable inputs used by the Company in its review and approval of the valuation of CRT derivatives and CRT strips are the discount rate, voluntary and involuntary prepayment speeds and the remaining loss expectations of the reference loans. Changes in fair value of CRT derivatives are included in Net gains (losses) on investments Following is a quantitative summary of key unobservable inputs used in the Company’s review and approval of broker-provided fair values for CRT derivatives: March 31, 2021 December 31, 2020 (dollars in thousands) Fair value CRT derivatives: Assets $ 58,134 $ 58,699 Liabilities $ 13,458 $ 26,904 UPB of loans in reference pools $ 11,539,702 $ 13,854,426 Key inputs (1) Discount rate Range 6.0% – 7.3% 6.7% – 9.0% Weighted average 7.1% 7.3% Voluntary prepayment speed (2) Range 13.0% – 13.6% 20.8% – 23.5% Weighted average 13.1% 21.9% Involuntary prepayment speed (3) Range (0.5)% – 1.2% (0.8)% – 1.1% Weighted average (0.1)% (0.2)% Remaining loss expectation (4) Range (0.6)% – 0.6% (0.6)% – 0.6% Weighted average (0.2)% (0.3)% (1) Weighted average inputs are based on fair value amounts of the CRT Agreements. (2) Voluntary prepayment speed is measured using Life Voluntary CPR. (3) Involuntary prepayment speed is measured using Life Involuntary CPR. The negative involuntary prepayment speed reflects the expectation for reinstatement to the reference pool of a significant portion of the loans that previously triggered losses due to delinquency while under CARES Act forbearance upon their projected re-performance, as contractually provided for in certain CRT Agreements. (4) Remaining loss expectation is measured as expected future contractual losses divided by the UPB of the reference loans. The negative remaining loss expectation reflects the expectation of contractual reversals of previously incurred contractual losses due to the projected re-performance of a significant portion of the reference loans in the future. Interest Rate Lock Commitments The Company categorizes IRLCs as “Level 3” fair value assets and liabilities. The Company estimates the fair value of IRLCs based on quoted Agency MBS prices, the probability that the loan will be purchased under the commitment (the “pull-through rate”) and the Company’s estimate of the fair value of the MSRs it expects to receive upon sale of the loan. The significant unobservable inputs used in the fair value measurement of the Company’s IRLCs are the pull-through rate and the MSR component of the Company’s estimate of the fair value of the loans it has committed to purchase. Significant changes in the pull-through rate or the MSR component of the IRLCs, in isolation, may result in a significant change in the IRLCs’ fair value. The financial effects of changes in these inputs are generally inversely correlated as increasing interest rates have a positive effect on the fair value of the MSR component of IRLC fair value, but also increase the pull-through rate for the loan principal and interest payment cash flow component that has decreased in fair value. Changes in fair value of IRLCs are included in Net gains on loans acquired for sale Following is a quantitative summary of key unobservable inputs used in the valuation of IRLCs: March 31, 2021 December 31, 2020 Fair value (in thousands) (1) $ (64,858 ) $ 72,386 Key inputs (2) Pull-through rate Range 42.0% – 100% 44.6% – 100% Weighted average 92.9% 86.3% MSR fair value expressed as Servicing fee multiple Range 1.2 – 6.5 2.0 – 5.3 Weighted average 5.0 4.4 Percentage of UPB Range 0.3% – 2.1% 0.5% – 1.9% Weighted average 1.3% 1.2% (1) For purposes of this table, IRLC asset and liability positions are shown net. (2) Weighted-average inputs are based on the committed amounts. Hedging Derivatives Fair values of derivative financial instruments actively traded on exchanges are categorized by the Company as “Level 1” fair value assets and liabilities; fair values of derivative financial instruments based on observable interest rates, volatilities and prices in the MBS or other markets are categorized by the Company as “Level 2” fair value assets and liabilities. Changes in the fair value of hedging derivatives are included in Net gains on loans acquired for sale, Net gains (losses) on investments Net loan servicing fees – from nonaffiliates – Mortgage servicing rights hedging results Credit Risk Transfer Strips The Company categorizes CRT strips as “Level 3” fair value assets or liabilities. The fair value of CRT strips is based on indications of fair value provided to the Company by nonaffiliated brokers for the certificates representing the beneficial interest in the trust holding the CRT strips and Deposits securing CRT arrangements, Deposits securing CRT arrangements The significant unobservable inputs into the valuation of CRT strips are the discount rate, voluntary and involuntary prepayment speeds and the remaining loss expectations of the reference loans. Changes in fair value of CRT strips are included in Net gains (losses) on investments Following is a quantitative summary of key unobservable inputs used in the Company’s review and approval of the adjusted broker-provided fair values used to derive the value of the CRT strips: March 31, 2021 December 31, 2020 (dollars in thousands) Carrying value CRT strip liabilities $ 109,570 $ 202,792 UPB of loans in the reference pools $ 36,863,982 $ 44,843,516 Key inputs (1) Discount rate Range 6.4% – 8.0% 6.0% – 8.4% Weighted average 7.8% 8.0% Voluntary prepayment speed (2) Range 15.7% – 18.6% 25.0% – 30.2% Weighted average 16.2% 26.2% Involuntary prepayment speed (3) Range 0.5% – 1.1% 0.8% – 1.7% Weighted average 0.6% 1.0% Remaining loss expectation (4) Range 0.3% – 0.7% 0.3% – 0.6% Weighted average 0.4% 0.4% (1) Weighted average inputs are based on the UPB of the loans in the reference pools. (2) Voluntary prepayment speed is measured using Life Voluntary CPR. (3) Involuntary prepayment speed is measured using Life Involuntary CPR. (4) Remaining loss expectation is measured as expected future losses divided by the UPB of the loans in the reference pools. Real Estate Acquired in Settlement of Loans REO is measured based on its fair value on a nonrecurring basis and is categorized as a “Level 3” fair value asset. Fair value of REO is established by using a current estimate of fair value from either a broker’s price opinion, a full appraisal, or the price given in a pending contract of sale. REO fair values are reviewed by PLS staff appraisers when the Company obtains multiple indications of fair value and there is a significant difference between the fair values received. PLS staff appraisers will attempt to resolve the difference between the indications of fair value. In circumstances where the staff appraisers are not able to generate adequate data to support a fair value conclusion, the staff appraisers obtain an additional appraisal to determine fair value. Recognized changes in the fair value of REO are included in Results of real estate acquired in settlement of loans Mortgage Servicing Rights The Company uses a discounted cash flow approach to estimate the fair value of MSRs. The fair value of MSRs is derived from the net positive cash flows associated with the servicing agreements. The Company receives a servicing fee based on the remaining outstanding principal balances of the loans subject to the servicing agreements. The Company generally has the right to receive other remuneration including various mortgagor-contracted fees such as late charges and collateral reconveyance charges, and the Company is generally entitled to retain any placement fees earned on funds held pending remittance of mortgagor principal, interest, tax and insurance payments. The key inputs used in the estimation of the fair value of MSRs include the applicable pricing spread, the prepayment rates of the underlying loans (“prepayment speed”) and the annual per-loan cost to service loans, all of which are unobservable. Significant changes to any of those inputs in isolation could result in a significant change in the MSR fair value measurement. Changes in these key inputs are not directly related. Changes in the fair value of MSRs are included in Net loan servicing fees – from nonaffiliates – Change in fair value of mortgage servicing rights MSRs are generally subject to loss in fair value when mortgage interest rates decrease, annual per-loan cost of servicing increases, or when returns required by market participants increase. Reductions in the fair value of MSRs affect income primarily through recognition of the change in fair value. Following are the key inputs used in determining the fair value of MSRs at the time of initial recognition: Quarter ended March 31, 2021 2020 (MSR recognized and UPB of underlying loans amounts in thousands) MSR recognized $ 407,696 $ 248,822 UPB of underlying loans $ 32,448,891 $ 19,341,270 Weighted average annual servicing fee rate (in basis points) 26 30 Key inputs (1) Pricing spread (2) Range 8.0% – 8.0% 6.7% – 9.9% Weighted average 8.0% 6

Mortgage-Backed Securities

Mortgage-Backed Securities	3 Months Ended
Mortgage-Backed Securities	Mar. 31, 2021
Mortgage Backed Securities [Abstract]
Mortgage-Backed Securities	Note 8— Following is a summary of activity in the Company’s investment in MBS: Quarter ended March 31, 2021 2020 (in thousands) Balance at beginning of quarter $ 2,213,922 $ 2,839,633 Purchases 1,259,189 1,615,486 Sales (1,300,653 ) (488,729 ) Repayments (182,333 ) (122,935 ) Changes in fair value included in income arising from: Amortization of net purchase premiums (2,523 ) (12,002 ) Valuation adjustments (71,117 ) 115,967 (73,640 ) 103,965 Balance at end of quarter $ 1,916,485 $ 3,947,420 Following is a summary of the Company’s investment in MBS: March 31, 2021 December 31, 2020 Agency: (1) Principal balance Unamortized net purchase premiums Accumulated valuation changes Fair value Principal balance Unamortized net purchase premiums Accumulated valuation changes Fair value (in thousands) Freddie Mac $ 654,051 $ 20,729 $ (21,741 ) $ 653,039 $ 1,253,755 $ 32,414 $ 24,867 $ 1,311,036 Fannie Mae 1,263,614 40,262 (40,430 ) 1,263,446 863,758 23,692 15,436 902,886 $ 1,917,665 $ 60,991 $ (62,171 ) $ 1,916,485 $ 2,117,513 $ 56,106 $ 40,303 $ 2,213,922 (1) All MBS are fixed-rate pass-through securities with maturities of more than ten years and are pledged to secure Assets sold under agreements to repurchase

Loans Acquired for Sale at Fair

Loans Acquired for Sale at Fair Value	3 Months Ended
Loans Acquired for Sale at Fair Value	Mar. 31, 2021
Mortgage Loans On Real Estate [Abstract]
Loans Acquired for Sale at Fair Value	Note 9—Loans Acquired for Sale at Fair Value Loans acquired for sale at fair value is comprised of recently originated loans purchased by the Company for resale. The Company is not approved by Ginnie Mae as an issuer of Ginnie Mae-guaranteed securities which are backed by government-insured or guaranteed loans. The Company sells government-insured or guaranteed loans that it purchases from correspondent sellers to PLS, which is a Ginnie Mae-approved issuer, and earns a sourcing fee as described in Note 4 — . Following is a summary of the distribution of the Company’s loans acquired for sale at fair value: Loan type March 31, 2021 December 31, 2020 (in thousands) Agency-eligible $ 4,284,646 $ 3,057,601 Held for sale to PLS — Government insured or guaranteed 327,881 460,414 Home equity lines of credit 4,864 5,566 Commercial real estate 998 1,010 Repurchased pursuant to representations and warranties 28,372 27,299 $ 4,646,761 $ 3,551,890 Loans pledged to secure: Assets sold under agreements to repurchase $ 4,519,274 $ 3,484,202 Mortgage loan participation purchase and sale agreements 70,919 17,645 $ 4,590,193 $ 3,501,847

Loans at Fair Value

Loans at Fair Value	3 Months Ended
Loans at Fair Value	Mar. 31, 2021
Mortgage Loans At Fair Value [Abstract]
Loans at Fair Value	Note 10—Loans at Fair Value Loans at fair value are comprised primarily of fixed interest rate jumbo loans held in a VIE securing an asset-backed financing and distressed loans that were not acquired for sale but may be sold at a later date pursuant to the Company’s determination that such a sale represents the most advantageous disposition strategy for the identified loan. Following is a summary of the distribution of the Company’s loans at fair value: Loan type March 31, 2021 December 31, 2020 (in thousands) Fixed interest rate jumbo loans held in a VIE $ 109,845 $ 143,707 Distressed loans 7,802 8,027 $ 117,647 $ 151,734 Loans at fair value pledged to secure: Asset-backed financing of a VIE at fair value $ 109,845 $ 143,707 Assets sold under agreements to repurchase 1,383 3,703 $ 111,228 $ 147,410

Derivative and Credit Risk Tran

Derivative and Credit Risk Transfer Strip Assets and Liabilities	3 Months Ended
	Mar. 31, 2021
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative and Credit Risk Transfer Strip Assets and Liabilities	Note 11—Derivative and Credit Risk Transfer Strip Assets and Liabilities Derivative and credit risk transfer assets and liabilities are summarized below: March 31, 2021 December 31, 2020 (in thousands) Derivative assets $ 182,969 $ 164,318 Credit risk transfer strip assets — — $ 182,969 $ 164,318 Derivative liabilities $ 120,400 $ 60,681 Credit risk transfer strip liabilities 109,570 202,792 $ 229,970 $ 263,473 The Company records all derivative and CRT strip assets and liabilities at fair value and records changes in fair value in current period results of operations. Derivative Activities The Company holds and issues derivative financial instruments in connection with its operating, investing and financing activities. Derivative financial instruments are created as a result of certain of the Company’s operations and the Company also enters into derivative transactions as part of its interest rate risk management activities. Derivative financial instruments created as a result of the Company’s operations include: • IRLCs that are created when the Company commits to purchase loans acquired for sale; • CRT Agreements whereby the Company retained a Recourse Obligation relating to certain loans it sold into Fannie Mae guaranteed securitizations as part of the retention of an IO ownership interest in such loans; and • Derivatives that were embedded in a master repurchase agreement that provided for the Company to receive interest expense offsets if it financed loans approved as satisfying certain consumer credit relief characteristics under that master repurchase agreement. The Company engages in interest rate risk management activities in an effort to reduce the variability of earnings caused by the effects of changes in interest rates on the fair value of certain of its assets and liabilities. The Company bears price risk related to its mortgage production, servicing and MBS financing activities due to changes in market interest rates as discussed below: • The Company is exposed to loss if market mortgage interest rates increase, because market interest rate increases generally cause the fair value of MBS, IRLCs and loans acquired for sale to decrease. • The Company is exposed to losses if market mortgage interest rates decrease, because market interest rate decreases generally cause the fair value of MSRs and ESS to decrease. To manage the price risk resulting from these interest rate risks, the Company uses derivative financial instruments with the intention of moderating the risk that changes in market interest rates will result in unfavorable changes in the fair value of the Company’s inventory of loans acquired for sale, loans held in a VIE, IRLCs, MSRs and MBS financing. The Company records all derivative and CRT strip assets at fair value and records changes in fair value in current period results of operations. The Company does not designate and qualify any of its derivative financial instruments for hedge accounting. Derivative Notional Amounts and Fair Value of Derivatives The Company had the following derivative assets and liabilities recorded within Derivative assets Derivative liabilities Other March 31, 2021 December 31, 2020 Fair value Fair value Notional Derivative Derivative Notional Derivative Derivative Instrument amount (1) assets liabilities amount (1) assets liabilities (in thousands) Subject to master netting agreements ─ economic hedging purposes (2): Call options on interest rate futures purchase contracts 2,550,000 $ 992 $ — 1,450,000 $ 3,070 $ — Put options on interest rate futures purchase contracts 3,750,000 18,938 — 2,800,000 4,742 — Put options on interest rate futures sale contracts 562,500 — 6,064 — — — Forward purchase contracts 15,169,597 6,687 89,312 17,563,549 72,526 17 Forward sale contracts 24,946,663 182,192 6,965 26,615,716 92 122,884 MBS put options 3,600,000 51,165 9,657 3,625,000 3,220 — Swaption purchase contracts 3,136,300 29,034 — 3,655,000 8,505 — Swap futures 2,750,000 — — 1,950,000 — — Bond futures 401,500 — — 66,500 — — Not subject to master netting arrangements: CRT derivatives 11,539,702 58,134 13,458 13,854,426 58,699 26,904 Interest rate lock commitments 8,525,688 7,552 72,410 10,588,208 72,794 408 Total derivative instruments before netting 354,694 197,866 223,648 150,213 Netting (171,725 ) (77,466 ) (59,330 ) (89,532 ) $ 182,969 $ 120,400 $ 164,318 $ 60,681 Margin deposits (received from) placed with derivatives counterparties, net $ (94,258 ) $ 30,197 Derivative assets pledged to secure: Notes payable secured by credit risk transfer and mortgage servicing assets $ 58,134 $ 58,699 (1) Notional amounts provide an indication of the volume of the Company’s derivative activity. (2) All hedging derivatives are interest rate derivatives that are used as economic hedges. Netting of Financial Instruments The Company has elected to net derivative asset and liability positions, and cash collateral placed with or received from its counterparties when subject to a legally enforceable master netting arrangement. The derivative financial instruments that are not subject to master netting arrangements are CRT derivatives, IRLCs and repurchase agreement derivatives. As of March 31, 2021 and December 31, 2020, the Company was not a party to any reverse repurchase agreements or securities lending transactions that are required to be disclosed in the following tables. Offsetting of Derivative Assets Following is a summary of net derivative assets: March 31, 2021 December 31, 2020 Gross amounts of recognized assets Gross amounts offset in the consolidated balance sheet Net amounts of assets presented in the consolidated balance sheet Gross amounts of recognized assets Gross amounts offset in the consolidated balance sheet Net amounts of assets presented in the consolidated balance sheet (in thousands) Derivative assets Subject to master netting arrangements: Call options on interest rate futures purchase contracts $ 992 $ — $ 992 $ 3,070 $ — $ 3,070 Put options on interest rate futures purchase contracts 18,938 — 18,938 4,742 — 4,742 Forward purchase contracts 6,687 — 6,687 72,526 — 72,526 Forward sale contracts 182,192 — 182,192 92 — 92 MBS put options 51,165 — 51,165 3,220 — 3,220 Swaption purchase contracts 29,034 — 29,034 8,505 — 8,505 Netting — (171,725 ) (171,725 ) — (59,330 ) (59,330 ) 289,008 (171,725 ) 117,283 92,155 (59,330 ) 32,825 Not subject to master netting arrangements: CRT derivatives 58,134 — 58,134 58,699 — 58,699 Interest rate lock commitments 7,552 — 7,552 72,794 — 72,794 65,686 — 65,686 131,493 — 131,493 $ 354,694 $ (171,725 ) $ 182,969 $ 223,648 $ (59,330 ) $ 164,318 Derivative Assets, Financial Instruments and Collateral Held by Counterparty The following table summarizes by significant counterparty the amount of derivative asset positions after considering master netting arrangements and financial instruments or cash pledged that do not meet the accounting guidance qualifying for setoff accounting. March 31, 2021 December 31, 2020 Net amount Gross amounts Net amount Gross amounts of assets not offset in the of assets not offset in the presented consolidated presented consolidated in the balance sheet in the balance sheet consolidated Cash consolidated Cash balance Financial collateral Net balance Financial collateral Net sheet instruments received amount sheet instruments received amount (in thousands) CRT derivatives $ 58,134 $ — $ — $ 58,134 $ 58,699 $ — $ — $ 58,699 Interest rate lock commitments 7,552 — — 7,552 72,794 — — 72,794 Federal Home Loan Mortgage Corporation 31,652 — — 31,652 — — — — J.P. Morgan Securities LLC 29,455 — — 29,455 — — — — Wells Fargo Securities, LLC 16,087 — — 16,087 — — — — RJ O’Brien & Associates, LLC 13,865 — — 13,865 7,813 — — 7,813 Bank of America, N.A. 13,191 — — 13,191 15,406 — — 15,406 Morgan Stanley & Co. LLC 7,949 — — 7,949 — — — — Citigroup Global Markets Inc. 3,431 — — 3,431 2,416 — — 2,416 PNC Capital Markets LLC 13 — — 13 3,138 — — 3,138 Deutsche Bank Securities LLC — — — — 1,602 — — 1,602 Mitsubishi UFJ Sec — — — — 1,070 — — 1,070 Other 1,640 — — 1,640 1,380 — — 1,380 $ 182,969 $ — $ — $ 182,969 $ 164,318 $ — $ — $ 164,318 Offsetting of Derivative Liabilities and Financial Liabilities Following is a summary of net derivative liabilities and assets sold under agreements to repurchase. Assets sold under agreements to repurchase do not qualify for setoff accounting. March 31, 2021 December 31, 2020 Gross amounts of recognized liabilities Gross amounts offset in the consolidated balance sheet Net amounts of liabilities presented in the consolidated balance sheet Gross amounts of recognized liabilities Gross amounts offset in the consolidated balance sheet Net amounts of liabilities presented in the consolidated balance sheet (in thousands) Derivative liabilities: Subject to master netting arrangements: Put options on interest rate futures sale contracts $ 6,064 $ — $ 6,064 $ — $ — $ — Forward purchase contracts 89,312 — 89,312 17 — 17 Forward sales contracts 6,965 — 6,965 122,884 — 122,884 MBS put options 9,657 — 9,657 — — — Netting — (77,466 ) (77,466 ) — (89,532 ) (89,532 ) 111,998 (77,466 ) 34,532 122,901 (89,532 ) 33,369 Not subject to master netting arrangements CRT derivatives 13,458 — 13,458 26,904 — 26,904 Interest rate lock commitments 72,410 — 72,410 408 — 408 197,866 (77,466 ) 120,400 150,213 (89,532 ) 60,681 Assets sold under agreements to repurchase: UPB 6,098,299 — 6,098,299 6,317,928 — 6,317,928 Unamortized debt issuance costs (6,326 ) — (6,326 ) (8,510 ) — (8,510 ) 6,091,973 — 6,091,973 6,309,418 — 6,309,418 $ 6,289,839 $ (77,466 ) $ 6,212,373 $ 6,459,631 $ (89,532 ) $ 6,370,099 Derivative Liabilities, Financial Liabilities and Collateral Pledged by Counterparty The following table summarizes by significant counterparty the amount of derivative liabilities and assets sold under agreements to repurchase after considering master netting arrangements and financial instruments or cash pledged that do not qualify for setoff accounting. All assets sold under agreements to repurchase represent sufficient collateral or exceed the liability amount recorded on the consolidated balance sheet. March 31, 2021 December 31, 2020 Net amount Gross amounts Net amount Gross amounts of liabilities not offset in the of liabilities not offset in the presented consolidated presented consolidated in the balance sheet in the balance sheet consolidated Cash consolidated Cash balance Financial collateral Net balance Financial collateral Net sheet instruments pledged amount sheet instruments pledged amount (in thousands) Interest rate lock commitments $ 72,410 $ — $ — $ 72,410 $ 408 $ — $ — $ 408 CRT derivatives 13,458 — — 13,458 26,904 — — 26,904 Credit Suisse Securities (USA) LLC 1,230,324 (1,209,194 ) — 21,130 1,059,547 (1,054,636 ) — 4,911 Bank of America, N.A. 1,031,487 (1,031,487 ) — — 414,044 (414,044 ) — — RBC Capital Markets, L.P. 750,308 (750,308 ) — — 765,892 (765,892 ) — — J.P. Morgan Securities LLC 642,606 (642,606 ) — — 359,573 (357,211 ) — 2,362 Daiwa Capital Markets 534,521 (534,032 ) — 489 728,207 (727,562 ) — 645 Barclays Capital Inc. 504,410 (504,410 ) — — 922,959 (922,035 ) — 924 Morgan Stanley & Co. LLC 393,370 (393,370 ) — — 367,493 (366,415 ) — 1,078 Citigroup Global Markets Inc. 261,628 (261,628 ) — — 830,161 (830,161 ) — — Goldman Sachs & Co. LLC 264,058 (261,528 ) — 2,530 149,272 (144,883 ) — 4,389 BNP Paribas 227,034 (227,034 ) — — 164,414 (163,548 ) — 866 Wells Fargo Securities, LLC 143,150 (143,150 ) — — 148,854 (140,796 ) — 8,058 Amherst Pierpont Securities LLC 139,552 (139,552 ) — — 153,224 (153,224 ) — — Mitsubishi UFJ Sec 4,788 — — 4,788 — — — — Bank of Oklahoma 3,304 — — 3,304 — — — — Mizuho Securities 1,059 — — 1,059 279,321 (277,521 ) — 1,800 Federal Home Loan Mortgage Corporation — — — — 5,883 — — 5,883 Other 1,232 — — 1,232 2,453 — — 2,453 $ 6,218,699 $ (6,098,299 ) $ — $ 120,400 $ 6,378,609 $ (6,317,928 ) $ — $ 60,681 Following are the net gains (losses) recognized by the Company on derivative financial instruments and the consolidated statements of operations line items where such gains and losses are included: Quarter ended March 31, Derivative activity Consolidated statement of operations line 2021 2020 (in thousands) Interest rate lock commitments Net gains on loans acquired for sale (1) $ (137,243 ) $ 68,231 CRT derivatives Net gains (losses) on investments $ 36,370 $ (215,125 ) Hedged item: Interest rate lock commitments and loans acquired for sale Net gains on loans acquired for sale $ 297,476 $ (140,368 ) Mortgage servicing rights Net loan servicing fees $ (374,403 ) $ 767,186 Fixed-rate and prepayment sensitive assets and LIBOR-indexed repurchase agreements Net gains (losses) on investments $ (24 ) $ 64,931 (1) Represents net increase in fair value of IRLCs from the beginning to the end of the reporting period. Amounts recognized at the date of commitment and fair value changes recognized during the period until purchase of the underlying loan are shown in the rollforward of IRLCs for the period in Note 7– Fair Value - Financial Statement Items Measured at Fair Value on a Recurring Basis . Credit Risk Transfer Strips Following is a summary of the Company’s holdings of CRT strips Credit risk transfer strips contractually restricted from sale (1) March 31, 2021 December 31, 2020 (in thousands) Liabilities Through December 4, 2021 $ 26,910 $ 168,539 To maturity 82,660 34,253 $ 109,570 $ 202,792 (1) The terms of the agreement underlying the CRT securities restricts sales of the securities, other than under agreements to repurchase, without the approval of Fannie Mae, for specified periods from the date of issuance.

Mortgage Servicing Rights

Mortgage Servicing Rights	3 Months Ended
Mortgage Servicing Rights	Mar. 31, 2021
Text Block [Abstract]
Mortgage Servicing Rights	Note 12—Mortgage Servicing Rights Following is a summary of MSRs: Quarter ended March 31, 2021 2020 (in thousands) Balance at beginning of quarter $ 1,755,236 $ 1,535,705 MSRs resulting from loan sales 407,696 248,822 Changes in fair value: Due to changes in valuation inputs used in valuation model (1) 337,667 (563,247 ) Other changes in fair value (2) (59,385 ) (63,954 ) 278,282 (627,201 ) Balance at end of quarter $ 2,441,214 $ 1,157,326 March 31, 2021 December 31, 2020 (in thousands) Fair value of mortgage servicing rights pledged to secure Assets sold under agreements to repurchase and risk transfer and mortgage servicing assets $ 2,423,063 $ 1,742,905 (1) Primarily reflects changes in pricing spread (discount rate), prepayment speed, and servicing cost inputs. (2) Represents changes due to realization of expected cash flows. Servicing fees relating to MSRs are recorded in Net loan servicing fees – from nonaffiliates Quarter ended March 31, 2021 2020 (in thousands) Contractually-specified servicing fees $ 116,287 $ 94,469 Ancillary and other fees: Late charges 412 500 Other 15,833 6,691 $ 132,532 $ 101,660

Short-Term Borrowings

Short-Term Borrowings	3 Months Ended
Short-Term Borrowings	Mar. 31, 2021
Short Term Borrowings [Abstract]
Short-Term Borrowings	Note 13— The borrowing facilities described throughout these Notes 13 and 14 contain various covenants, including financial covenants governing the Company’s net worth, debt-to-equity ratio, profitability and liquidity. Management believes that the Company was in compliance with these covenants as of March 31, 2021. Assets Sold Under Agreements to Repurchase Following is a summary of financial information relating to assets sold under agreements to repurchase: Quarter ended March 31, 2021 2020 (dollars in thousands) Weighted average interest rate (1) 1.60 % 2.31 % Average balance $ 5,971,290 $ 6,302,900 Total interest expense $ 28,659 $ 37,750 Maximum daily amount outstanding $ 7,208,807 $ 8,664,587 (1) Excludes the effect of amortization of debt issuance costs of $5.2 million and $1.4 million for the quarters ended March 31, 2021 and 2020, respectively. March 31, 2021 December 31, 2020 (dollars in thousands) Carrying value: Unpaid principal balance $ 6,098,299 $ 6,317,928 Unamortized debt issuance costs (6,326 ) (8,510 ) $ 6,091,973 $ 6,309,418 Weighted average interest rate 1.65 % 1.36 % Available borrowing capacity (1): Committed $ 240,290 $ 483,767 Uncommitted 3,416,352 4,151,905 $ 3,656,642 $ 4,635,672 Margin deposits placed with counterparties included in Other $ 13,966 $ 141,808 Assets securing agreements to repurchase: Mortgage-backed securities $ 1,916,485 $ 2,213,922 Loans acquired for sale at fair value $ 4,519,274 $ 3,484,202 Loans at fair value $ 1,383 $ 3,703 MSRs (2) $ 1,537,749 $ 1,166,090 Real estate acquired in settlement of loans $ 10,250 $ 15,365 Deposits securing CRT arrangements $ — $ 2,799,263 (1) The amount the Company is able to borrow under asset repurchase agreements is tied to the fair value of unencumbered assets eligible to secure those agreements and the Company’s ability to fund the agreements’ margin requirements relating to the assets financed. (2) Beneficial interests in Fannie Mae MSRs are pledged as collateral under both Assets sold under agreements to repurchase and Notes payable secured by credit risk transfer and mortgage servicing assets . Following is a summary of maturities of outstanding advances under repurchase agreements by maturity date: Remaining maturity at March 31, 2021 Unpaid principal balance (in thousands) Within 30 days $ 1,879,732 Over 30 to 90 days 3,468,259 Over 90 days to 180 days 750,308 $ 6,098,299 Weighted average maturity (in months) 1.9 The Company is subject to margin calls during the period the repurchase agreements are outstanding and therefore may be required to repay a portion of the borrowings before the respective repurchase agreements mature if the fair value (as determined by the applicable lender) of the assets securing those repurchase agreements decreases. The amount at risk (the fair value of the assets pledged plus the related margin deposit, less the amount advanced by the counterparty and interest payable) and maturity information relating to the Company’s assets sold under agreements to repurchase is summarized by pledged asset and counterparty below as of March 31, 2021: Loans, REO and MSRs Counterparty Amount Weighted average maturity Facility maturity (in thousands) Bank of America, N.A. $ 119,373 May 3, 2021 June 9, 2021 Credit Suisse First Boston Mortgage Capital LLC $ 75,611 April 23, 2021 April 23, 2021 RBC Capital Markets, L.P. $ 32,331 July 15, 2021 November 10, 2021 JPMorgan Chase & Co. $ 13,559 April 7, 2021 April 7, 2021 Barclays Capital Inc. $ 18,223 June 3, 2021 November 3, 2022 Morgan Stanley & Co. LLC $ 18,714 June 21, 2021 November 2, 2022 Citibank, N.A. $ 10,807 May 22, 2021 August 3, 2021 Goldman Sachs & Co. LLC $ 9,460 June 21, 2021 December 23, 2022 BNP Paribas $ 7,646 June 13, 2021 July 30, 2021 Wells Fargo Securities, LLC $ 5,141 June 21, 2021 October 6, 2022 Securities Counterparty Amount at risk Weighted average maturity (in thousands) Bank of America, N.A. $ 10,793 April 14, 2021 JPMorgan Chase & Co. $ 17,117 April 8, 2021 Barclays Capital Inc. $ 8,732 April 15, 2021 Daiwa Capital Markets America Inc. $ 14,961 April 16, 2021 Amherst Pierpont Securities LLC $ 4,488 April 16, 2021 Mortgage Loan Participation Purchase and Sale Agreements Certain borrowing facilities secured by loans acquired for sale are in the form of mortgage loan participation purchase and sale agreements. Participation certificates, each of which represents an undivided beneficial ownership interest in a pool of loans that have been pooled with Fannie Mae or Freddie Mac, are sold to a lender pending the securitization of such loans and the sale of the resulting security. The commitment between the Company and a nonaffiliate to sell such security is also assigned to the lender at the time a participation certificate is sold. The purchase price paid by the lender for each participation certificate is based on the trade price of the security, plus an amount of interest expected to accrue on the security to its anticipated delivery date, minus a present value adjustment, any related hedging costs and a holdback amount. The holdback amount is based on a percentage of the purchase price and is not required to be paid to the Company until the settlement of the security and its delivery to the lender. Mortgage loan participation purchase and sale agreements are summarized below: Quarter ended March 31, 2021 2020 (dollars in thousands) Weighted average interest rate (1) 1.38 % 2.73 % Average balance $ 39,162 $ 41,301 Total interest expense $ 164 $ 338 Maximum daily amount outstanding $ 82,571 $ 94,387 (1) Excludes the effect of amortization of debt issuance costs of $31,000 and $57,000 for the quarters ended March 31, 2021 and 2020, respectively. March 31, 2021 December 31, 2020 (dollars in thousands) Carrying value: Amount outstanding $ 68,176 $ 16,851 Unamortized debt issuance costs — — $ 68,176 $ 16,851 Weighted average interest rate 1.36 % 1.39 % Loans acquired for sale pledged to secure mortgage loan participation purchase and sale agreements $ 70,919 $ 17,645

Long-Term Debt

Long-Term Debt	3 Months Ended
Long-Term Debt	Mar. 31, 2021
Debt Disclosure [Abstract]
Long-Term Debt	Note 14— Long-Term Debt Notes Payable Secured By Credit Risk Transfer and Mortgage Servicing Assets The Company, through its indirect subsidiary, PMT CREDIT RISK TRANSFER TRUST, issued Term Notes to qualified institutional buyers under Rule 144A of the Securities Act of 1933, as amended (the “Securities Act”). All of the Term Notes rank pari passu with each other with the Series 2017-VF1 Note dated December 20, 2017 (the "FMSR VFN") issued by another of the Company’s indirect subsidiaries. Following is a summary of the secured CRT Term Notes issued: Maturity date (2) Term Notes Issuance date Issuance amount Unpaid principal balance Annual interest rate spread (1) Stated Optional extension (in thousands) 2021 1R March 04, 2021 $ 659,156 $ 657,070 2.90 % February 28, 2024 February 27, 2026 2020 2R December 22, 2020 $ 500,000 496,909 3.81 % December 28, 2022 — 2020 1R February 14, 2020 $ 350,000 156,016 2.35 % March 1, 2023 February 27, 2025 2019 3R October 16, 2019 $ 375,000 151,523 2.70 % October 27, 2022 October 29, 2024 2019 2R June 11, 2019 $ 638,000 408,000 2.75 % May 29, 2023 May 29, 2025 2019 1R March 29, 2019 $ 295,700 139,269 2.00 % March 29, 2022 March 27, 2024 $ 2,008,787 (1) Spread over 1-month LIBOR. (2) The indentures relating to these issuances provide the Company with the option of extending the maturity dates of the Term Notes under the conditions specified in respective agreements. PMC finances mortgage servicing rights through the issuance of the FMSR VFN sold to institutional buyers under an agreement to repurchase. On August 4, 2020, PMC increased the committed borrowing capacity to $700 million and extended the VFN termination date to August 3, 2021. On March 30, 2021, the Company, through its indirect subsidiary, PMT ISSUER TRUST—FMSR, issued an aggregate principal amount of $350 million in secured term notes (the “2021-FT1 Notes”) to qualified institutional buyers under Rule 144A of the Securities Act. The 2021-FT1 Notes are secured by certain participation certificates relating to Fannie Mae MSRs and excess servicing spread relating to such MSRs that are financed pursuant to a structured finance transaction. The 2021-FT1 Notes bear interest at a rate equal to one-month LIBOR plus 3.00% per annum and will mature on March 25, 2026 or, if extended pursuant to the terms of the 2021-FT1 Notes indenture supplement o n March 27, 2028 . The 2021-FT1 Notes rank pari passu with the Series 2018-FT1 Notes described below and the FMSR VFN. During March 2021, the Company, through PMC and PMH, terminated a loan and security agreement entered into on Feburary 1, 2018, pursuant to which PMC and PMH may finance certain mortgage servicing rights (inclusive of any related excess servicing spread arising therefrom and that may be transferred from PMC to PMH from time to time) relating to loans pooled into Freddie Mac securities, and entered into a similar borrowing arrangement with Citibank, N.A. The aggregate loan amount available under the loan and security agreement with Citibank, N.A. increased to $700 million from $175 million, bears interest at a rate indexed to LIBOR plus a margin, with index replacement provisions related to the transition from LIBOR, and will mature on August 3, 2021. Advances under the loan and security agreement are secured by MSRs relating to loans serviced for Freddie Mac guaranteed securities. On April 25, 2018, the Company, through its indirect subsidiary, PMT ISSUER TRUST-FMSR, issued an aggregate principal amount of $450 million in secured term notes (the “2018-FT1 Notes”) to qualified institutional buyers under Rule 144A of the Securities Act. The 2018-FT1 Notes bear interest at a rate equal to one-month LIBOR plus 2.35% per annum. The 2018-FT1 Notes will mature on April 25, 2023 or, if extended pursuant to the terms of the 2018-FT1 Notes indenture supplement, April 25, 2025 (unless earlier redeemed in accordance with their terms). The 2018-FT1 Notes rank pari passu with the FMSR VFN pledged to Credit Suisse under an agreement to repurchase. The 2018-FT1 Notes and the FMSR VFN are secured by certain participation certificates relating to Fannie Mae MSRs and ESS relating to such MSRs. Following is a summary of financial information relating to the notes payable: Quarter ended March 31, 2021 2020 (dollars in thousands) Weighted average interest rate (1) 3.14 % 4.10 % Average balance $ 2,260,721 $ 1,860,213 Total interest expense $ 18,599 $ 19,618 Maximum daily amount outstanding $ 3,180,115 $ 2,032,665 (1) Excludes the effect of amortization of debt issuance costs of $1.1 million and $609,000 for the quarters ended March 31, 2021 and 2020, respectively. March 31, 2021 December 31, 2020 (dollars in thousands) Carrying value: Amount outstanding $ 2,908,788 $ 1,930,018 Unamortized debt issuance costs (10,994 ) (5,019 ) $ 2,897,794 $ 1,924,999 Weighted average interest rate 2.93 % 2.99 % Assets securing notes payable: MSRs (1) $ 2,423,063 $ 1,742,905 CRT Agreements: Deposits securing CRT arrangements $ 2,664,420 $ 2,799,263 Derivative assets $ 58,134 $ 58,699 (1) Beneficial interests in Freddie Mac and Fannie Mae MSRs are pledged as collateral for both Assets sold under agreements to repurchase and Notes payable secured by credit risk transfer and mortgage servicing assets Exchangeable Notes On March 5 and March 9, 2021, PMC issued in a private offering $345 million aggregate principal amount of exchangeable senior notes (the “2026 Exchangeable Notes”). The 2026 Exchangeable Notes will mature on March 15, 2026 unless repurchased or exchanged in accordance with their terms before such date. The 2026 Exchangeable Notes bear interest at a rate of 5.50% per year, payable semiannually. The 2026 Exchangeable Notes are fully and unconditionally guaranteed by the Company and are exchangeable for PMT common shares, cash, or a combination thereof, at PMC’s election, at any time until the close of business on the second scheduled trading day immediately preceding the maturity date, subject to the satisfaction of certain conditions if the exchange occurs before December 15, 2025. The exchange rate initially equals 46.1063 common shares per $1,000 principal amount of the 2026 Exchangeable Notes and is subject to adjustment upon the occurrence of certain events, but will not be adjusted for any accrued and unpaid interest. On November 7 and November 19, 2019, PMC issued $210 million in principal amount of 5.50% exchangeable senior notes due 2024 (the “2024 Exchangeable Notes”) in a private offering. The 2024 Exchangeable Notes will mature on November 1, 2024 unless repurchased or exchanged in accordance with their terms before such date. The 2024 Exchangeable Notes are fully and unconditionally guaranteed by the Company and are exchangeable for PMT common shares, cash, or a combination thereof, at PMC’s election, at any time until the close of business on the second scheduled trading day immediately preceding the maturity date, subject to the satisfaction of certain conditions if the exchange occurs before August 1, 2024. The exchange rate equals 40.101 common shares per $1,000 principal amount of the 2024 Exchangeable Notes and is subject to adjustment upon the occurrence of certain events, but will not be adjusted for any accrued and unpaid interest. Following is financial information relating to the Exchangeable Notes: Quarter ended March 31, 2021 2020 (in thousands) Average balance $ 298,554 $ 460,000 Total interest expense $ 5,542 $ 7,266 March 31, 2021 December 31, 2020 (in thousands) Carrying value: UPB $ 555,000 $ 210,000 Unamortized debt issuance costs and conversion option (60,903 ) (13,204 ) $ 494,097 $ 196,796 Asset-Backed Financing of a Variable Interest Entity at Fair Value Following is a summary of financial information relating to the asset-backed financing of a VIE at fair value described in Note 6 — Variable Interest Entities-Jumbo Loan Financing Quarter ended March 31, 2021 2020 (dollars in thousands) Average balance $ 120,415 $ 240,765 Total interest expense $ 168 $ 4,527 Weighted average interest rate 3.22 % 3.39 % March 31, 2021 December 31, 2020 (dollars in thousands) Fair value $ 101,238 $ 134,726 UPB $ 100,036 $ 131,835 Weighted average interest rate 3.57 % 3.56 % The asset-backed financing of a VIE is a non-recourse liability and is secured solely by the assets of a consolidated VIE and not by any other assets of the Company. The assets of the VIE are the only source of funds for repayment of the certificates. Maturity of Long-Term Debt Annual maturities of long-term debt obligations (based on final maturity dates) are as follows: Twelve months ended March 31, Total 2022 2023 2024 2025 2026 Thereafter (in thousands) Notes payable secured by credit risk transfer and mortgage servicing assets (1) $ 2,808,788 $ 139,269 $ 804,448 $ 1,515,071 $ — $ 350,000 $ — Exchangeable senior notes 555,000 — — — 210,000 345,000 — Asset-backed financing of a variable interest entity at fair value (2) 100,036 — — — — — 100,036 Interest-only security payable at fair value (2) 18,922 — — — — — 18,922 Total $ 3,482,746 $ 139,269 $ 804,448 $ 1,515,071 $ 210,000 $ 695,000 $ 118,958 (1) Based on stated maturity. Certain of the notes payable allow the Company to exercise an optional extension as discussed above. (2) Contractual maturities do not reflect expected repayments as borrowers of the underlying loans generally have the right to repay their loans at any time.

Liability for Losses Under Repr

Liability for Losses Under Representations and Warranties	3 Months Ended
Liability for Losses Under Representations and Warranties	Mar. 31, 2021
Liability For Representations And Warranties [Abstract]
Liability for Losses Under Representations and Warranties	Note 15—Liability for Losses Under Representations and Warranties Following is a summary of the Company’s liability for losses under representations and warranties: Quarter ended March 31, 2021 2020 (in thousands) Balance, beginning of quarter $ 21,893 $ 7,614 Provision for losses: Pursuant to loan sales 8,513 1,030 Reduction in liability due to change in estimate (1,424 ) (1,344 ) Losses incurred, net (15 ) — Balance, end of quarter $ 28,967 $ 7,300 UPB of loans subject to representations and warranties at end of quarter $ 177,595,762 $ 131,049,135

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Mar. 31, 2021
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 16—Commitments and Contingencies Litigation From time to time, the Company may be involved in various proceedings, claims and legal actions arising in the ordinary course of business. The amount, if any, of ultimate liability with respect to such matters cannot be determined, but despite the inherent uncertainties of litigation, management believes that the ultimate disposition of any such proceedings and exposure will not have, individually or taken together, a material adverse effect on the financial condition, results of operations, or cash flows of the Company. Commitments The following table summarizes the Company’s outstanding contractual commitments: March 31, 2021 (in thousands) Commitments to purchase loans acquired for sale $ 8,525,688

Shareholders' Equity

Shareholders' Equity	3 Months Ended
Shareholders' Equity	Mar. 31, 2021
Equity [Abstract]
Shareholders' Equity	Note 17—Shareholders’ Equity Preferred Shares of Beneficial Interest Preferred shares of beneficial interest are summarized below: Preferred Dividends per share quarter ended March 31, Shared Series Description (1) Number of shares Liquidation preference Issuance discount Carrying value 2021 2020 Fixed-to-floating rate cumulative redeemable preferred (in thousands, except dividends per share) A 8.125% Issued March 2017 4,600 $ 115,000 $ 3,828 $ 111,172 $ 0.51 $ 0.51 B 8.00% Issued July 2017 7,800 195,000 6,465 188,535 $ 0.50 $ 0.50 12,400 $ 310,000 $ 10,293 $ 299,707 (1) Par value is $0.01 per share. The Company’s Series A Fixed-to-Floating Rate Cumulative Redeemable Preferred Shares of Beneficial Interest (the “Series A Preferred Shares”) pay cumulative dividends at a fixed rate of 8.125% per annum based on the $25.00 per share liquidation preference to, but not including, March 15, 2024. From, and including, March 15, 2024 and thereafter, the Company will pay cumulative dividends on the Series A Preferred Shares at a floating rate equal to three-month LIBOR as calculated on each applicable dividend determination date plus a spread of 5.831% per annum based on the $25.00 per share liquidation preference. The Company’s Series B Fixed-to-Floating Rate Cumulative Redeemable Preferred Shares of Beneficial Interest (the “Series B Preferred Shares”) (together with the Series A Preferred Shares, the “Preferred Shares”) pay cumulative dividends at a fixed rate of 8.00% per annum based on the $25.00 per share liquidation preference to, but not including, June 15, 2024. From, and including, June 15, 2024 and thereafter, the Company will pay cumulative dividends on the Series B Preferred Shares at a floating rate equal to three-month LIBOR as calculated on each applicable dividend determination date plus a spread of 5.99% per annum based on the $25.00 per share liquidation preference. The Series A and Series B Preferred Shares will not be redeemable before March 15, 2024 and June 15, 2024, respectively, except in connection with the Company’s qualification as a REIT for U.S. federal income tax purposes or upon the occurrence of a change of control. On or after the date the Preferred Shares become redeemable, or 120 days after the first date on which such change of control occurred, the Company may, at its option, redeem any or all of the Preferred Shares at $25.00 per share plus any accumulated and unpaid dividends thereon to, but not including, the redemption date. The Preferred Shares have no stated maturity, are not subject to any sinking fund or mandatory redemption and will remain outstanding indefinitely unless redeemed or repurchased by the Company or converted into common shares in connection with a change of control by the holders of the Preferred Shares. Common Shares of Beneficial Interest “At-The-Market” (ATM) Equity Offering Program During March 2019, t he Company entered into separate equity distribution agreements to sell from time to time, through an ATM equity offering program under which the counterparties will act as sales agent and/or principal, the Company’s common shares having an aggregate offering price of up to $200 million Quarter ended March 31, 2020 (in thousands) Number of common shares issued 241 Gross proceeds $ 5,654 Net proceeds $ 5,597 A t March 31, 2021 , the Company had approximately $74.4 million of common shares of beneficial interest available for issuance under its ATM equity offering program. Common Share Repurchase Program During August 2015, the Company’s board of trustees authorized a common share repurchase program. Under the program, as amended, the Company may repurchase up to $300 million of its outstanding common shares of beneficial interest. The following table summarizes the Company’s share repurchase activity: Quarter ended Cumulative March 31, 2020 total (1) (in thousands) Common shares repurchased 783 17,498 Cost of common shares repurchased $ 5,783 $ 253,892 (1) Amounts represent the share repurchase program total from its inception in August 2015 through March 31, 2021.

Net Gains on Loans Acquired for

Net Gains on Loans Acquired for Sale	3 Months Ended
Net Gains on Loans Acquired for Sale	Mar. 31, 2021
Text Block [Abstract]
Net Gains on Loans Acquired for Sale	Note 18— Net Gains on Loans Acquired for Sale Net gains on loans acquired for sale are summarized below: Quarter ended March 31, 2021 2020 (in thousands) From nonaffiliates: Cash loss: Loans $ (592,789 ) $ (68,954 ) Hedging activities 463,276 (23,378 ) (129,513 ) (92,332 ) Non-cash gain: Recognition of fair value of firm commitment to purchase CRT securities — (26,649 ) Receipt of MSRs in mortgage loan sale transactions 407,696 248,822 Provision for losses relating to representations and warranties provided in mortgage loan sales: Pursuant to loans sales (8,513 ) (1,030 ) Reduction of liability due to change in estimate 1,424 1,344 (7,089 ) 314 Change in fair value of loans and derivatives held at end of quarter: IRLCs (137,243 ) 68,231 Loans 83,223 (36,782 ) Hedging derivatives (165,800 ) (116,990 ) (219,820 ) (85,541 ) 180,787 136,946 Total from nonaffiliates 51,274 44,614 From PFSI—cash gain 1,738 4,161 $ 53,012 $ 48,775

Net Gains (Losses) on Investmen

Net Gains (Losses) on Investments	3 Months Ended
Net Gains (Losses) on Investments	Mar. 31, 2021
Investments Debt And Equity Securities [Abstract]
Net Gains (Losses) on Investments	Note 19— Net gains (losses) on investments are summarized below: Quarter ended March 31, 2021 2020 (in thousands) From nonaffiliates: Mortgage-backed securities $ (71,117 ) $ 115,967 Loans at fair value: Held in a VIE (2,345 ) (2,869 ) Distressed 95 (1,142 ) CRT arrangements 154,031 (487,292 ) Firm commitment to purchase CRT securities — (492,513 ) Asset-backed financing of a VIE at fair value 900 1,928 Hedging derivatives (24 ) 64,931 81,540 (800,990 ) From PFSI—ESS 1,651 (14,141 ) $ 83,191 $ (815,131 )

Net Interest Income (Expense)

Net Interest Income (Expense)	3 Months Ended
Net Interest Income (Expense)	Mar. 31, 2021
Banking And Thrift Interest [Abstract]
Net Interest (Expense) Income	Note 20—Net Interest Expense Net interest income is summarized below: Quarter ended March 31, 2021 2020 (in thousands) Interest income: From nonaffiliates: Cash and short-term investments $ 225 $ 1,627 Mortgage-backed securities 8,286 15,568 Loans acquired for sale at fair value 22,908 31,523 Loans at fair value: Held in a VIE 1,899 2,641 Distressed 253 59 Deposits securing CRT arrangements 168 6,099 Placement fees relating to custodial funds 2,532 12,398 Other 38 234 36,309 70,149 From PFSI—ESS 1,280 1,974 37,589 72,123 Interest expense: To nonaffiliates: Assets sold under agreements to repurchase 28,659 37,750 Mortgage loan participation purchase and sale agreements 164 338 Notes payable secured by credit risk transfer and mortgage servicing assets 18,599 19,618 Exchangeable Notes 5,542 7,266 Asset-backed financings of a VIE at fair value 168 4,527 Interest shortfall on repayments of loans serviced for Agency securitizations 22,040 9,439 Interest on loan impound deposits 749 912 75,921 79,850 To PFSI—Assets sold under agreement to repurchase 387 1,218 76,308 81,068 Net interest expense $ (38,719 ) $ (8,945 )

Share-Based Compensation

Share-Based Compensation	3 Months Ended
Share-Based Compensation	Mar. 31, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Share-Based Compensation	Note 21—Share-Based Compensation The Company has adopted an equity incentive plan which provides for the issuance of equity based awards based on PMT’s common shares that may be made by the Company to its officers and trustees, and the members, officers, trustees, directors and employees of PCM, PFSI, or their affiliates and to PCM, PFSI and other entities that provide services to PMT and the employees of such other entities. The equity incentive plan is administered by the Company’s compensation committee, pursuant to authority delegated by PMT’s board of trustees, which has the authority to make awards to the eligible participants referenced above, and to determine what form the awards will take, and the terms and conditions of the awards. The Company’s equity incentive plan allows for grants of share-based awards up to an aggregate of 8% of PMT’s issued and outstanding shares on a diluted basis at the time of the award. The shares underlying award grants will again be available for award under the equity incentive plan if: • any shares subject to an award granted under the equity incentive plan are forfeited, canceled, exchanged or surrendered; • an award terminates or expires without a distribution of shares to the participant; or • shares are surrendered or withheld by PMT as payment of either the exercise price of an award and/or withholding taxes for an award. Restricted share units have been awarded to trustees and officers of the Company and to other employees of PFSI and its subsidiaries at no cost to the grantees. Such awards generally vest over a one-to three-year The following table summarizes the Company’s share-based compensation activity: Quarter ended March 31, 2021 2020 (in thousands) Grants: Restricted share units 101 92 Performance share units 84 112 Total share units granted 185 204 Grant date fair value: Restricted share units $ 1,917 $ 1,978 Performance share units 1,602 2,428 Total grant date value of share units $ 3,519 $ 4,406 Vestings: Restricted share units 100 123 Performance share units (1) 37 143 Total share units vested 137 266 Forfeitures: Restricted share units — — Performance share units — — Total share units forfeited — — Compensation expense relating to share-based grants $ 1,738 $ 186 (1) The actual number of performance-based RSUs that vested during the quarter ended March 31, 2021 was 37,000 common shares, which is 100% of the originally granted performance-based RSUs. March 31, 2021 Restricted share units Performance share units Shares expected to vest: Number of units (in thousands) 190 251 Grant date average fair value per unit $ 20.07 $ 19.26

Income Taxes

Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Note 22—Income Taxes The Company’s effective tax rate was 21.3% with consolidated pretax income of $91.0 million for the quarter ended March 31, 2021. The Company’s taxable REIT subsidiary (“TRS”) recognized tax expense of $19.4 million on pretax income of $88.1 million for the quarter ended March 31, 2020. For the same period in 2020, the TRS recognized tax expense of $10.1 million on pretax loss of $21.8 million, while the Company’s reported consolidated pretax loss for the quarter ended March 31, 2020 was $584.4 million. The primary difference between the Company’s effective tax rate and the statutory tax rate is generally attributable to nontaxable REIT income resulting from the dividends paid deduction. The Company assesses the available positive and negative evidence to estimate whether sufficient future taxable income will be generated to permit use of the existing deferred tax assets. On the basis of this evaluation, as of March 31, 2021, the valuation allowance was reduced to $0 from the $110,000 valuation allowance recorded at December 31, 2020 as the result of positive GAAP income at the TRS for the quarter ended March 31, 2021. The amount of deferred tax assets considered realizable could be adjusted in future periods based on future income The CARES Act, passed in March 2020, introduced a number of tax law changes which are generally taxpayer favorable and, in December 2020, the Taxpayer Certainty and Disaster Tax Relief Act was signed into law. No material changes in our effective income tax rates resulted from either Act. The CARES Act does provide for carry back of losses from 2018, 2019 and 2020. However, the TRS does not have taxable income from prior years to which the losses could be carried back. In general, cash dividends declared by the Company will be considered ordinary income to the shareholders for income tax purposes. Some portion of the dividends may be characterized as capital gain distributions or a return of capital. For tax years beginning after December 31, 2017, the 2017 Tax Cuts and Jobs Act (subject to certain limitations) provides a 20% deduction from taxable income for ordinary REIT dividends.

Earnings Per Share

Earnings Per Share	3 Months Ended
Earnings Per Share	Mar. 31, 2021
Earnings Per Share [Abstract]
Earnings Per Share	Note 23—Earnings Per Share The Company grants restricted share units which entitle the recipients to receive dividend equivalents during the vesting period on a basis equivalent to the dividends paid to holders of common shares. Unvested share-based compensation awards containing non-forfeitable rights to receive dividends or dividend equivalents (collectively, “dividends”) are classified as “participating securities” and are included in the basic earnings per share calculation using the two-class method. Under the two-class method, all earnings (distributed and undistributed) are allocated to common shares and participating securities based on their respective rights to receive dividends. Basic earnings per share is determined by dividing net income available to common shareholders (net income reduced by preferred dividends and income attributable to the participating securities) by the weighted average common shares outstanding during the period. Diluted earnings per share is determined by dividing net income attributable to diluted shareholders, which adds back to net income the interest expense, net of applicable income taxes, on the 2020 Notes, by the weighted average common shares outstanding, assuming all dilutive securities were issued. The Company issued the Exchangeable Notes. The Exchangeable Notes include cash conversion options. The Company intends to cash settle the Exchangeable Notes. Therefore, the effect of conversion of the Exchangeable Notes is excluded from diluted earnings (loss) per share. The following table summarizes the basic and diluted earnings per share calculations: Quarter ended March 31, 2021 2020 (in thousands except per share amounts) Net income (loss) $ 71,603 $ (594,673 ) Dividends on preferred shares (6,234 ) (6,234 ) Effect of participating securities—share-based compensation awards (120 ) (50 ) Net income (loss) attributable to common shareholders $ 65,249 $ (600,957 ) Weighted average basic shares outstanding 97,892 100,245 Dilutive securities-shares issuable under share-based compensation plan 211 — Diluted weighted average number of shares outstanding 98,103 100,245 Basic earnings (loss) per share $ 0.67 $ (5.99 ) Diluted earnings (loss) per share $ 0.67 $ (5.99 ) Calculation of diluted earnings per share requires certain potentially dilutive shares to be excluded when the inclusion of such shares in the diluted earnings per share calculation would be anti-dilutive. The following table summarizes the potentially dilutive shares excluded from the diluted earnings per share calculation as inclusion of such shares would have been antidilutive: Quarter ended March 31, 2021 2020 (in thousands) Shares issuable under share-based compensation plan 11 135 Shares issuable pursuant to exchange of the 2020 Notes — 8,467

Segments

Segments	3 Months Ended
Segments	Mar. 31, 2021
Segment Reporting [Abstract]
Segments	Note 24—Segments The Company operates in four segments as described in Note 1 — Organization Financial highlights by operating segment are summarized below: Credit Interest rate sensitive sensitive Correspondent March 31, 2021 strategies strategies production Corporate Total (in thousands) Net investment income: Net (loss) gain on loans acquired for sale $ (1 ) $ — $ 53,013 $ — $ 53,012 Net gain (loss) on investments 154,271 (71,080 ) — — 83,191 Net loan servicing fees — 50,045 — — 50,045 Net interest expense: Interest income 650 13,516 22,797 626 37,589 Interest expense 17,261 37,316 21,731 — 76,308 (16,611 ) (23,800 ) 1,066 626 (38,719 ) Other 888 — 52,980 — 53,868 138,547 (44,835 ) 107,059 626 201,397 Expenses: Loan fulfillment and servicing fees payable to PFSI 137 18,955 60,836 — 79,928 Management fees — — — 8,449 8,449 Other 4,150 812 10,646 6,384 21,992 4,287 19,767 71,482 14,833 110,369 Pretax (loss) income $ 134,260 $ (64,602 ) $ 35,577 $ (14,207 ) $ 91,028 Total assets at quarter end $ 2,772,111 $ 4,739,849 $ 4,796,564 $ 213,730 $ 12,522,254 Credit Interest rate sensitive sensitive Correspondent Quarter ended March 31, 2020 strategies strategies production Corporate Total (in thousands) Net investment income: Net (loss) gain on loans acquired for sale $ (32,306 ) $ — $ 81,081 $ — $ 48,775 Net (loss) gain on investments (919,109 ) 103,978 — — (815,131 ) Net loan servicing fees — 244,572 — — 244,572 Net interest expense: Interest income 6,556 33,241 31,407 919 72,123 Interest expense 14,566 41,608 24,309 585 81,068 (8,010 ) (8,367 ) 7,098 334 (8,945 ) Other 166 — 23,988 58 24,212 (959,259 ) 340,183 112,167 392 (506,517 ) Expenses: Loan fulfillment and servicing fees payable to PFSI 301 14,220 41,940 — 56,461 Management fees — — — 9,055 9,055 Other 911 1,182 4,918 5,381 12,392 1,212 15,402 46,858 14,436 77,908 Pretax (loss) income $ (960,471 ) $ 324,781 $ 65,309 $ (14,044 ) $ (584,425 ) Total assets at quarter end $ 1,947,153 $ 5,664,991 $ 3,068,163 $ 1,238,181 $ 11,918,488

Supplemental Cash Flow Informat

Supplemental Cash Flow Information	3 Months Ended
Supplemental Cash Flow Information	Mar. 31, 2021
Supplemental Cash Flow Elements [Abstract]
Supplemental Cash Flow Information	Note 25—Supplemental Cash Flow Information Quarter ended March 31, 2021 2020 (in thousands) Payments: Income taxes, net $ 494 $ — Interest $ 91,611 $ 104,757 Non-cash investing activities: Transfer of loans and advances to real estate acquired in settlement of loans $ 280 $ 1,166 Receipt of mortgage servicing rights as proceeds from sales of loans at fair value $ 407,696 $ 248,822 Receipt of excess servicing spread pursuant to recapture agreement with PennyMac Financial Services, Inc. $ 557 $ 379 Non-cash financing activities: Dividends declared, not paid $ 46,109 $ 25,009

Regulatory Capital and Liquidit

Regulatory Capital and Liquidity Requirements	3 Months Ended
Regulatory Capital and Liquidity Requirements	Mar. 31, 2021
Mortgage Banking [Abstract]
Regulatory Capital and Liquidity Requirements	Note 26—Regulatory Capital and Liquidity Requirements The Company is subject to financial eligibility requirements established by the Federal Housing Finance Agency (“FHFA”) for sellers/servicers eligible to sell or service mortgage loans with Fannie Mae and Freddie Mac. The eligibility requirements include: • A tangible net worth of $2.5 million plus 25 basis points of the UPB of the Company’s total 1-4 unit servicing portfolio, excluding mortgage loans subserviced for others; • A tangible net worth/total assets ratio greater than or equal to 6%; and • A liquidity requirement effective June 30, 2020 equal to 3.5 basis points of the aggregate UPB serviced for the Agencies plus 200 basis points of total nonperforming Agency servicing UPB less 70% of such nonperforming Agency servicing UPB in excess of 600 basis points where the underlying loans are in forbearance but were current at the time they entered forbearance. The Agencies’ capital and liquidity amounts and requirements, are summarized below: Net Worth (1) Tangible Net Worth / Total Assets Ratio (1) Liquidity (1) Fannie Mae and Freddie Mac Actual Required Actual Required Actual Required (dollars in thousands) March 31, 2021 $ 1,170,013 $ 473,294 14 % 6 % $ 155,419 $ 63,664 December 31, 2020 $ 1,101,318 $ 438,530 16 % 6 % $ 101,116 $ 59,158 (1) Calculated in accordance with the Agencies’ requirements. Noncompliance with the Agencies’ capital and liquidity requirements can result in the Agencies taking various remedial actions up to and including removing the Company’s ability to sell loans to and service loans on behalf of the Agencies.

Subsequent Events

Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2021
Subsequent Events [Abstract]
Subsequent Events	Note 27—Subsequent Events Management has evaluated all events and transactions through the date the Company issued these consolidated financial statements. During this period. All agreements to repurchase assets that matured before the date of this Report were extended or renewed.

Organization and Basis of Prese

Organization and Basis of Presentation and Recently Issued Accounting Pronouncements (Policies)	3 Months Ended
	Mar. 31, 2021
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Segment Reporting	PennyMac Mortgage Investment Trust (“PMT” or the “Company”) is a specialty finance company, which, through its subsidiaries (all of which are wholly-owned), invests primarily in residential mortgage-related assets. The Company operates in four segments: credit sensitive strategies, interest rate sensitive strategies, correspondent production, and corporate: • The credit sensitive strategies segment represents the Company’s investments in credit risk transfer (“CRT”) arrangements, including CRT agreements (“CRT Agreements”) and CRT securities (together, “CRT arrangements”), distressed loans, real estate, and non-Agency subordinated bonds. • The interest rate sensitive strategies segment represents the Company’s investments in mortgage servicing rights (“MSRs”), excess servicing spread (“ESS”) purchased from PennyMac Financial Services, Inc. (“PFSI”), Agency and senior non-Agency mortgage-backed securities (“MBS”) and the related interest rate hedging activities. • The correspondent production segment represents the Company’s operations aimed at serving as an intermediary between lenders and the capital markets by purchasing, pooling and reselling newly originated prime credit quality loans either directly or in the form of MBS, using the services of PNMAC Capital Management, LLC (“PCM” or the “Manager”) and PennyMac Loan Services, LLC (“PLS”), both indirect controlled subsidiaries of PFSI. The Company primarily sells the loans it acquires through its correspondent production activities to government-sponsored entities such as the Federal National Mortgage Association (“Fannie Mae”) and the Federal Home Loan Mortgage Corporation (“Freddie Mac”) or to PLS for sale into securitizations guaranteed by the Government National Mortgage Association (“Ginnie Mae”). Fannie Mae, Freddie Mac and Ginnie Mae are each referred to as an “Agency” and, collectively, as the “Agencies.” • The corporate segment includes management fees, corporate expense amounts and certain interest income.
Basis of Presentation	Basis of Presentation The Company’s consolidated financial statements have been prepared in compliance with accounting principles generally accepted in the United States (“GAAP”) as codified in the Financial Accounting Standards Board’s (“FASB”) Accounting Standards Codification These unaudited consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the financial position, results of operations, and cash flows for the interim periods presented, but are not necessarily indicative of the results of operations that may be anticipated for the full year. Intercompany accounts and transactions have been eliminated. Preparation of financial statements in compliance with GAAP requires the Company to make estimates and judgments that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements, and revenues and expenses during the reporting period. Actual results will likely differ from those estimates. The Company held no restricted cash during the periods presented. Therefore, the consolidated statements of cash flows do not include references to restricted cash.
Accounting Change	Pending Accounting Change In August 2020, the FASB issued Accounting Standards Update 2020-06, Debt – Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging – Contracts in Entity’s Own Equity (Subtopic 815-40) Debt – Debt with Conversion and Other Options • the embedded conversion features in debt instruments no longer are separated from the host contract for convertible instruments with conversion features that are not required to be accounted for as derivatives or that do not result in substantial premiums accounted for as paid-in capital. Consequently, a convertible debt instrument will generally be accounted for as a single liability measured at its amortized cost; • Diluted earnings per share guidance is changed to require that: • an entity is required to include shares issuable pursuant to conversion of convertible debt instruments in the determination of diluted earnings per share; current guidance allows an entity to exclude such shares from the diluted earnings per share calculation if the company has a history and policy of cash settlement; • an average market price should be used to calculate the diluted EPS denominator in cases in which the exercise prices may change on the basis of an entity’s share price or changes in the entity’s share price may affect the number of shares that may be used to settle a financial instrument; and • an entity should use the weighted-average share count from each quarter when calculating the year-to-date weighted-average share count. ASU 2020-06 is effective for the Company beginning in the quarter ending March 31, 2022 with early adoption allowed beginning in the quarter ending March 31, 2021 using either the modified retrospective or full retrospective method. The Company intends to adopt ASU 2020-06 beginning in the quarter ending March 31, 2022. As detailed in Note 14 – Long-Term Debt • The exchange feature included in the Exchangeable Notes can be settled either in cash or common shares at the option of PennyMac Corp. (“PMC”). As a result of this feature and PMT’s intent to cash settle the Exchangeable Notes, the Company presently excludes the effect of exchange of the Exchangeable Notes from diluted earnings per share as allowed under current accounting standards. Adoption of ASU 2020-06 will require the Company to include common shares issuable pursuant to exchange of the Exchangeable Notes in its determination of diluted earnings per share. • The Company recognized the fair value of the exchange feature as a component of Additional paid-in capital as of the date of issuance of the Exchangeable Notes as required by current guidance. The issuance discount charged to the Exchangeable Notes resulting from the allocation of the issuance discount to Additional paid-in capital is presently accrued to interest expense using the interest method. Upon adoption of ASU 2020-06, the value originally attributed to Additional paid-in capital as of the date of issuance of the Exchangeable Notes will be added to the carrying value of the Exchangeable Notes and the accumulated accrual of the exchange value to interest expense through the date of adoption of ASU 2020-06 will be credited to retained earnings net of income taxes as the cumulative effect of the adoption of ASU 2020-06.
Fair Value Measurement	The Company’s consolidated financial statements include assets and liabilities that are measured at or based on their fair values. Measurement at or based on fair value may be on a recurring or nonrecurring basis depending on the accounting principles applicable to the specific asset or liability and whether the Company has elected to carry the item at its fair value as discussed in the following paragraphs. The Company groups its assets and liabilities at fair value in three levels, based on the markets in which the assets and liabilities are traded and the observability of the inputs used to determine fair value. These levels are: • Level 1—Quoted prices in active markets for identical assets or liabilities. • Level 2—Prices determined or determinable using other significant observable inputs. Observable inputs are inputs that other market participants would use in pricing an asset or liability and are developed based on market data obtained from sources independent of the Company. • Level 3—Prices determined using significant unobservable inputs. In situations where significant observable inputs are unavailable, unobservable inputs may be used. Unobservable inputs reflect the Company’s own judgments about the factors that market participants use in pricing an asset or liability, and are based on the best information available in the circumstances. As a result of the difficulty in observing certain significant valuation inputs affecting “Level 3” fair value assets and liabilities, the Company is required to make judgments regarding these items’ fair values. Different persons in possession of the same facts may reasonably arrive at different conclusions as to the inputs to be applied in valuing these assets and liabilities and their fair values. Such differences may result in significantly different fair value measurements. Likewise, due to the general illiquidity of some of these assets and liabilities, subsequent transactions may be at values significantly different from those reported. The Company reclassifies its assets and liabilities between levels of the fair value hierarchy when the inputs required to establish fair value at a level of the fair value hierarchy are no longer readily available, requiring the use of lower-level inputs, or when the inputs required to establish fair value at a higher level of the hierarchy become available. Fair Value Accounting Elections The Company identified all of PMT’s non-cash financial assets, its Firm commitment to purchase CRT securities The Company has also identified its Asset-backed financing of a VIE at fair value Interest-only security payable at fair value
Earnings Per Share	The Company grants restricted share units which entitle the recipients to receive dividend equivalents during the vesting period on a basis equivalent to the dividends paid to holders of common shares. Unvested share-based compensation awards containing non-forfeitable rights to receive dividends or dividend equivalents (collectively, “dividends”) are classified as “participating securities” and are included in the basic earnings per share calculation using the two-class method. Under the two-class method, all earnings (distributed and undistributed) are allocated to common shares and participating securities based on their respective rights to receive dividends. Basic earnings per share is determined by dividing net income available to common shareholders (net income reduced by preferred dividends and income attributable to the participating securities) by the weighted average common shares outstanding during the period. Diluted earnings per share is determined by dividing net income attributable to diluted shareholders, which adds back to net income the interest expense, net of applicable income taxes, on the 2020 Notes, by the weighted average common shares outstanding, assuming all dilutive securities were issued. The Company issued the Exchangeable Notes. The Exchangeable Notes include cash conversion options. The Company intends to cash settle the Exchangeable Notes. Therefore, the effect of conversion of the Exchangeable Notes is excluded from diluted earnings (loss) per share.

Transactions with Related par_2

Transactions with Related parties (Tables)	3 Months Ended
Transactions with Related parties (Tables)	Mar. 31, 2021
Related Party Transactions [Abstract]
Summary of Correspondent Production Activity	Following is a summary of correspondent production activity between the Company and PLS: Quarter ended March 31, 2021 2020 (in thousands) Loan fulfillment fees earned by PLS $ 60,835 $ 41,940 Sourcing fees received from PLS included in Net gain on loans acquired for sale $ 1,738 $ 4,161 UPB of loans sold to PLS $ 17,559,575 $ 13,870,280 Purchases of loans acquired for sale from PLS $ — $ 2,246,127 Tax service fees paid to PLS $ 8,192 $ 3,980 March 31, 2021 December 31, 2020 (in thousands) Loans included in Loans acquired for sale at fair value pending sale to PLS $ 327,881 $ 460,414
Summary of Loan Servicing Fees Earned and Mortgage Servicing Rights Recaptured Income Earned	Following is a summary of loan servicing fees earned by PLS: Quarter ended March 31, 2021 2020 (in thousands) Loan servicing fees: Loans acquired for sale at fair value $ 543 $ 536 Loans at fair value 137 300 MSRs 18,413 13,685 $ 19,093 $ 14,521 Average investment in: Loans acquired for sale at fair value $ 3,618,980 $ 3,215,418 Loans at fair value: Distressed $ 7,805 $ 11,249 Held in a VIE $ 129,122 $ 253,759 Average MSR portfolio UPB $ 177,161,626 $ 136,687,324
Summary of Management Fee Expense	Following is a summary of management fee expenses: Quarter ended March 31, 2021 2020 (in thousands) Base management $ 8,449 $ 9,055 Performance incentive — — $ 8,449 $ 9,055 Average shareholders' equity amounts used to calculate base management fee expense $ 2,310,261 $ 2,466,740
Summary of Expenses	Following is a summary of the Company’s reimbursements to PCM and its affiliates for expenses: Quarter ended March 31, 2021 2020 (in thousands) Reimbursement of: Common overhead incurred by PCM and its affiliates $ 571 $ 1,540 Compensation 165 120 Expenses incurred on the Company’s behalf, net 1,336 1,271 $ 2,072 $ 2,931 Payments and settlements during the quarter (1) $ 112,741 $ 33,683 (1) Payments and settlements include payments and netting settlements made pursuant to master netting agreements between the Company and PFSI for the operating, investing and financing activities itemized in this Note.
Summary of Investing Activity	Following is a summary of investing activities between the Company and PFSI: Quarter ended March 31, 2021 2020 (in thousands) ESS: Received pursuant to a recapture agreement $ 557 $ 379 Repayments $ 134,624 $ 9,308 Interest income $ 1,280 $ 1,974 Net gain (loss) included in Net gains (losses) on investments: Valuation changes $ 1,037 $ (14,522 ) Recapture income 614 381 $ 1,651 $ (14,141 ) March 31, 2021 December 31, 2020 (in thousands) Excess servicing spread purchased from PennyMac Financial Services, Inc. at fair value $ — $ 131,750
Summary of Financing Transactions	Following is a summary of financing activities between the Company and PFSI: Quarter ended March 31, 2021 2020 (in thousands) Net repayments of assets sold under agreements to repurchase $ 80,862 $ 7,746 Interest expense $ 387 $ 1,218 March 31, 2021 December 31, 2020 (in thousands) Assets sold to PFSI under agreement to repurchase $ — $ 80,862
Summary of Amounts Receivable From and Payable to PFSI	Amounts receivable from and payable to PFSI are summarized below: March 31, 2021 December 31, 2020 (in thousands) Due from PFSI: MSR recapture $ — $ 296 Other 7,521 7,856 $ 7,521 $ 8,152 Due to PFSI: Allocated expenses and expenses and costs paid by PFSI on PMT’s behalf $ 23,325 $ 38,142 Fulfillment fees 17,347 20,873 Correspondent production fees 12,937 13,065 Management fees 8,449 8,686 Loan servicing fees 6,586 6,213 Interest on Assets sold to PFSI under agreement to repurchase — 26 $ 68,644 $ 87,005
Summary of Transfer Cash to Fund Loan Servicing Advances	The Company has also transferred cash to fund loan servicing advances and REO property acquisition and preservation costs advanced on its behalf by PLS. Such amounts are included in various balance sheet items as summarized below: Balance sheet line including advance amount March 31, 2021 December 31, 2020 (in thousands) Loan servicing advances $ 150,160 $ 121,820 Real estate acquired in settlement of loans 6,788 10,334 $ 156,948 $ 132,154

Loan Sales (Tables)

Loan Sales (Tables)	3 Months Ended
Loan Sales (Tables)	Mar. 31, 2021
Loan Sales [Abstract]
Summary of Cash Flows between Company and Transferees in Transfers Accounted for Sales	The following table summarizes cash flows between the Company and transferees in transfers of loans that are accounted for as sales where the Company maintains continuing involvement with the loans: Quarter ended March 31, 2021 2020 (in thousands) Cash flows: Proceeds from sales $ 33,318,157 $ 19,718,151 Loan servicing fees received net of guarantee fees $ 116,287 $ 94,469
Summary of Collection Status Information for Loans Accounted for Sales	The following table summarizes, for the dates presented, collection status information for loans that are accounted for as sales where the Company maintains continuing involvement: March 31, 2021 December 31, 2020 (in thousands) UPB of loans outstanding $ 183,271,774 $ 170,502,361 Collection Status (UPB) (1) Delinquency : 30-89 days delinquent $ 920,655 $ 1,235,981 90 or more days delinquent: Not in foreclosure $ 3,788,000 $ 4,428,915 In foreclosure $ 24,647 $ 27,494 Bankruptcy $ 154,197 $ 148,866 Custodial funds managed by the Company (2) $ 6,571,084 $ 6,086,724 Delinquent loans in COVID-19 pandemic-related forbearance: 30-89 days $ 511,015 $ 530,353 90 days or more $ 3,364,821 $ 3,123,288 (1) Includes delinquent loans in COVID-19 pandemic-related forbearance plans that were requested by borrowers seeking payment relief in accordance with the CARES Act. (2) Custodial funds include borrower and investor custodial cash accounts relating to loans serviced under mortgage servicing agreements and are not included on the Company’s consolidated balance sheets. The Company earns placement fees on certain of the custodial funds it manages on behalf of the loans’ borrowers and investors, which are included in Interest income in the Company’s consolidated statements of operations.

Variable Interest Entities (Tab

Variable Interest Entities (Tables) - Variable Interest Entity, Primary Beneficiary [Member]	3 Months Ended
	Mar. 31, 2021
Jumbo Mortgage Loan Financing [Member]
Summary of Jumbo Mortgage Loan Financing	Following is a summary of the Company’s jumbo loan financing: Quarter ended March 31, 2021 2020 (in thousands) Interest income $ 1,899 $ 2,641 Interest expense $ 168 $ 4,527 March 31, 2021 December 31, 2020 (in thousands) Loans at fair value $ 109,845 $ 143,707 Asset-backed financing at fair value $ 101,238 $ 134,726 Certificates retained at fair value $ 8,607 $ 8,981
Credit Risk Transfer Agreements [Member]
Summary of Credit Risk Transfer Agreements	Following is a summary of the CRT arrangements: Quarter ended March 31, 2021 2020 (in thousands) UPB of loans sold $ 14,683,055 Investments — Change in expected face amount of firm commitment to purchase CRT securities $ 554,690 Investment income (loss): Net gains on loans acquired for sale — Fair value of firm commitment to purchase CRT securities recognized upon sale of loans $ — $ (26,649 ) Net gains (losses) on investments: Derivative and CRT strips: CRT derivatives Realized 23,496 17,201 Valuation changes 12,874 (300,943 ) 36,370 (283,742 ) CRT strips Realized 32,604 14,750 Valuation changes 93,222 (229,875 ) 125,826 (215,125 ) Interest-only security payable at fair value (8,165 ) 11,575 154,031 (487,292 ) Firm commitments to purchase CRT securities — (492,513 ) 154,031 (979,805 ) Interest income — Deposits securing CRT arrangements 168 6,099 $ 154,199 $ (1,000,355 ) Net (recoveries received) payments made to settle (recoveries) losses on CRT arrangements $ (13,343 ) $ 1,517 March 31, 2021 December 31, 2020 (in thousands) Carrying value of CRT arrangements: Derivative and credit risk transfer strip assets (liabilities), net CRT derivatives $ 44,676 $ 31,795 CRT strips (109,570 ) (202,792 ) $ (64,894 ) $ (170,997 ) Deposits securing CRT arrangements $ 2,664,420 $ 2,799,263 Interest-only security payable at fair value $ 18,922 $ 10,757 CRT arrangement assets pledged to secure borrowings: Derivative and credit risk transfer assets $ 58,134 $ 58,699 Deposits securing CRT arrangements (1) $ 2,664,420 $ 2,799,263 UPB of loans — funded CRT arrangements $ 48,403,684 $ 58,697,942 Collection status (UPB): Delinquency Current $ 45,422,502 $ 54,990,381 30-89 days delinquent $ 489,284 $ 710,872 90-180 days delinquent $ 472,038 $ 693,315 180 or more days delinquent $ 2,014,310 $ 2,297,365 Foreclosure $ 5,550 $ 6,009 Bankruptcy $ 77,362 $ 75,700 Delinquent loans in COVID-19 pandemic-related forbearance: 30-89 days delinquent $ 245,592 $ 383,028 90-180 days delinquent $ 353,422 $ 546,344 180 or more days delinquent $ 1,614,170 $ 1,944,663 (1) Deposits securing credit risk transfer strip liabilities also secure $123.0 million and $229.7 million in CRT strip and CRT derivative liabilities at March 31, 2021 and December 31, 2020, respectively .

Fair Value (Tables)

Fair Value (Tables)	3 Months Ended
Fair Value (Tables)	Mar. 31, 2021
Fair Value Disclosures [Abstract]
Summary of Financial Statement Items Measured at Fair Value on Recurring Basis	Following is a summary of financial statement items that are measured at fair value on a recurring basis: March 31, 2021 Level 1 Level 2 Level 3 Total (in thousands) Assets: Short-term investments $ 108,375 $ — $ — $ 108,375 Mortgage-backed securities at fair value — 1,916,485 — 1,916,485 Loans acquired for sale at fair value — 4,612,527 34,234 4,646,761 Loans at fair value — 109,845 7,802 117,647 Derivative and credit risk transfer strip assets: Call options on interest rate futures purchase contracts 992 — — 992 Put options on interest rate futures purchase contracts 18,938 — — 18,938 Forward purchase contracts — 6,687 — 6,687 Forward sale contracts — 182,192 — 182,192 MBS put options — 51,165 — 51,165 Swaption purchase contracts — 29,034 — 29,034 CRT derivatives — — 58,134 58,134 Interest rate lock commitments — — 7,552 7,552 Total derivative assets before netting 19,930 269,078 65,686 354,694 Netting — — — (171,725 ) Total derivative and credit risk transfer strip assets after netting 19,930 269,078 65,686 182,969 Mortgage servicing rights at fair value — — 2,441,214 2,441,214 $ 128,305 $ 6,907,935 $ 2,548,936 $ 9,413,451 Liabilities: Asset-backed financing of a VIE at fair value $ — $ 101,238 $ — $ 101,238 Interest-only security payable at fair value — — 18,922 18,922 Derivative and credit risk transfer strip liabilities: Put options on interest rate futures sale contracts — 6,064 — 6,064 Forward purchase contracts — 89,312 — 89,312 Forward sales contracts — 6,965 — 6,965 MBS put options — 9,657 — 9,657 CRT derivatives — — 13,458 13,458 Interest rate lock commitments — — 72,410 72,410 Total derivative liabilities before netting — 111,998 85,868 197,866 Netting — — — (77,466 ) Total derivative liabilities after netting — 111,998 85,868 120,400 Credit risk transfer strips — — 109,570 109,570 Total derivative and credit risk transfer strips liabilities — 111,998 195,438 229,970 $ — $ 213,236 $ 214,360 $ 350,130 December 31, 2020 Level 1 Level 2 Level 3 Total (in thousands) Assets: Short-term investments $ 127,295 $ — $ — $ 127,295 Mortgage-backed securities at fair value — 2,213,922 — 2,213,922 Loans acquired for sale at fair value — 3,518,015 33,875 3,551,890 Loans at fair value — 143,707 8,027 151,734 Excess servicing spread purchased from PFSI — — 131,750 131,750 Derivative and credit risk transfer strip assets: Call options on interest rate futures 3,070 — — 3,070 Put options on interest rate futures 4,742 — — 4,742 Forward purchase contracts — 72,526 — 72,526 Forward sale contracts — 92 — 92 MBS put options — 3,220 — 3,220 Swaption purchase contracts — 8,505 — 8,505 CRT derivatives — — 58,699 58,699 Interest rate lock commitments — — 72,794 72,794 Total derivative assets before netting 7,812 84,343 131,493 223,648 Netting — — — (59,330 ) Total derivative assets after netting 7,812 84,343 131,493 164,318 Mortgage servicing rights at fair value — — 1,755,236 1,755,236 $ 135,107 $ 5,959,987 $ 2,060,381 $ 8,096,145 Liabilities: Asset-backed financing of a VIE at fair value $ — $ 134,726 $ — $ 134,726 Interest-only security payable at fair value — — 10,757 10,757 Derivative liabilities: Forward purchase contracts — 17 — 17 Forward sales contracts — 122,884 — 122,884 CRT derivatives — — 26,904 26,904 Interest rate lock commitments — — 408 408 Total derivative liabilities before netting — 122,901 27,312 150,213 Netting — — — (89,532 ) Total derivative liabilities after netting — 122,901 27,312 60,681 Credit risk transfer strips — — 202,792 202,792 Total derivative and credit risk transfer strips liabilities — 122,901 230,104 263,473 $ — $ 257,627 $ 240,861 $ 408,956
Summary of Changes in Items Measured Using Level 3 Inputs on Recurring Basis	The following is a summary of changes in items measured at fair value on a recurring basis using Level 3 inputs that are significant to the estimation of the fair values of the assets and liabilities at either the beginning or end of the quarters presented: Quarter ended March 31, 2021 Assets (1) Loans acquired for sale Loans at fair value Excess servicing spread CRT derivatives Interest rate lock commitments CRT strips Mortgage servicing rights Total (in thousands) Balance, December 31, 2020 $ 33,875 $ 8,027 $ 131,750 $ 31,795 $ 72,386 $ (202,792 ) $ 1,755,236 $ 1,830,277 Purchases and issuances 15,898 — — — (9,704 ) — — 6,194 Repayments and sales (16,070 ) (584 ) (134,624 ) (23,489 ) — (32,604 ) — (207,371 ) Capitalization of interest and fees — 198 1,280 — — — — 1,478 ESS received pursuant to a recapture agreement with PFSI — — 557 — — — — 557 Amounts received pursuant to sales of loans — — — — — — 407,696 407,696 Changes in fair value included in results of operations arising from: Changes in instrument- specific credit risk — — — — — — — — Other factors 531 95 1,037 36,370 (275,515 ) 125,826 278,282 166,626 531 95 1,037 36,370 (275,515 ) 125,826 278,282 166,626 Transfers: Loans from REO — 66 — — — — — 66 Interest rate lock commitments to loans acquired for sale (2) — — — — 147,975 — — 147,975 Balance, March 31, 2021 $ 34,234 $ 7,802 $ — $ 44,676 $ (64,858 ) $ (109,570 ) $ 2,441,214 $ 2,353,498 Changes in fair value recognized during the quarter relating to assets still held at March 31, 2021 $ 337 $ 81 $ — $ 12,874 $ (64,858 ) $ 93,222 $ 278,282 $ 319,938 (1) For the purpose of this table, CRT derivatives, IRLCs. and CRT strips asset and liability positions are shown net. (2) The Company had transfers among the fair value levels arising from transfers of IRLCs to loans acquired for sale at fair value upon purchase of the respective loans. Liabilities Quarter ended March 31, 2021 (in thousands) Interest-only security payable: Balance, December 31, 2020 $ 10,757 Changes in fair value included in results of operations arising from: Changes in instrument-specific credit risk — Other factors 8,165 8,165 Balance, March 31, 2021 $ 18,922 Changes in fair value recognized during the quarter relating to liability outstanding at March 31, 2021 $ 8,165 Quarter ended March 31, 2020 Assets (1) Loans acquired for sale Loans at fair value Excess servicing spread CRT derivatives Interest rate lock commitments Repurchase agreement derivatives CRT strips Firm commitment to purchase CRT securities Mortgage servicing rights Total (in thousands) Balance, December 31, 2019 $ 18,567 $ 14,426 $ 178,586 $ 115,863 $ 11,154 $ 5,275 $ 54,930 $ 109,513 $ 1,535,705 $ 2,044,019 Purchases and issuances 11,291 1,058 — — 89,919 — — — — 102,268 Repayments and sales (7,557 ) (4,335 ) (9,308 ) (18,054 ) — — (14,750 ) — — (54,004 ) Capitalization of interest — — 1,974 — — — — — — 1,974 ESS received pursuant to a recapture agreement with PFSI — — 379 — — — — — — 379 Amounts (incurred) received pursuant to sales of loans — — — — — — — (26,649 ) 248,822 222,173 Changes in fair value included in results of operations arising from: Changes in instrument- specific credit risk — — — — — — — — — — Other factors 240 (1,142 ) (14,522 ) (283,742 ) 103,645 — (215,125 ) (492,513 ) (627,201 ) (1,530,360 ) 240 (1,142 ) (14,522 ) (283,742 ) 103,645 — (215,125 ) (492,513 ) (627,201 ) (1,530,360 ) Transfers: Loans to REO — (885 ) — — — — — — — (885 ) Interest rate lock commitments to loans acquired for sale (2) — — — — (125,334 ) — — — — (125,334 ) Balance, March 31, 2020 $ 22,541 $ 9,122 $ 157,109 $ (185,933 ) $ 79,384 $ 5,275 $ (174,945 ) $ (409,649 ) $ 1,157,326 $ 660,230 Changes in fair value recognized during the quarter relating to assets still held at March 31, 2020 $ 160 $ (841 ) $ (14,522 ) $ (300,944 ) $ 79,384 $ — $ (229,875 ) $ (492,513 ) $ (627,201 ) $ (1,586,352 ) (1) For the purpose of this table, CRT derivatives, IRLCs. CRT strips, and Firm commitment to purchase CRT securities asset and liability positions are shown net. (2) The Company had transfers among the fair value levels arising from transfers of IRLCs to loans acquired for sale at fair value upon purchase of the respective loans. Liabilities Quarter ended March 31, 2020 (in thousands) Interest-only security payable: Balance, December 31, 2019 $ 25,709 Changes in fair value included in income arising from: Changes in instrument- specific credit risk — Other factors (11,575 ) (11,575 ) Balance, March 31, 2020 $ 14,134 Changes in fair value recognized during the quarter relating to liability outstanding at March 31, 2020 $ (11,575 )
Fair Values and Related Principal Amounts Due upon Maturity of Mortgage Loans Accounted for Under Fair Value Option	Following are the fair values and related principal amounts due upon maturity of loans accounted for under the fair value option (including loans acquired for sale, loans held in a consolidated VIE, and distressed loans): March 31, 2021 December 31, 2020 Fair value Principal amount due upon maturity Difference Fair value Principal amount due upon maturity Difference (in thousands) Loans acquired for sale at fair value: Current through 89 days delinquent $ 4,639,977 $ 4,568,613 $ 71,364 $ 3,545,100 $ 3,377,970 $ 167,130 90 or more days delinquent: Not in foreclosure 6,589 7,306 (717 ) 6,591 8,006 (1,415 ) In foreclosure 195 235 (40 ) 199 235 (36 ) 6,784 7,541 (757 ) 6,790 8,241 (1,451 ) $ 4,646,761 $ 4,576,154 $ 70,607 $ 3,551,890 $ 3,386,211 $ 165,679 Loans at fair value: Loans held in a consolidated VIE: Current through 89 days delinquent $ 107,468 $ 101,015 $ 6,453 $ 140,052 $ 128,787 $ 11,265 90 or more days delinquent: Not in foreclosure 2,377 2,885 (508 ) 3,655 4,240 (585 ) In foreclosure — — — — — — 2,377 2,885 (508 ) 3,655 4,240 (585 ) 109,845 103,900 5,945 143,707 133,027 10,680 Distressed loans: Current through 89 days delinquent 2,460 4,336 (1,876 ) 2,071 4,099 (2,028 ) 90 or more days delinquent: Not in foreclosure 3,074 10,807 (7,733 ) 3,714 12,357 (8,643 ) In foreclosure 2,268 5,634 (3,366 ) 2,242 4,641 (2,399 ) 5,342 16,441 (11,099 ) 5,956 16,998 (11,042 ) 7,802 20,777 (12,975 ) 8,027 21,097 (13,070 ) $ 117,647 $ 124,677 $ (7,030 ) $ 151,734 $ 154,124 $ (2,390 )
Summary of Changes in Fair Value Included in Current Period Income	Following are the changes in fair value included in current period results of operations by consolidated statement of operations line item for financial statement items accounted for under the fair value option: Quarter ended March 31, 2021 Net gains on loans acquired for sale Net gains (losses) on investments Net loan servicing fees Net interest (expense) income Total (in thousands) Assets: Mortgage-backed securities at fair value $ — $ (71,117 ) $ — $ (2,523 ) $ (73,640 ) Credit risk transfer strips — 125,826 — — 125,826 Loans acquired for sale at fair value (106,664 ) — — — (106,664 ) Loans at fair value — (2,250 ) — 825 (1,425 ) ESS at fair value — 1,037 — 1,280 2,317 MSRs at fair value — — 278,282 — 278,282 $ (106,664 ) $ 53,496 $ 278,282 $ (418 ) $ 224,696 Liabilities: Interest-only security payable at fair value $ — $ (8,165 ) $ — $ — $ (8,165 ) Asset-backed financing of a VIE at fair value — 900 — 789 1,689 $ — $ (7,265 ) $ — $ 789 $ (6,476 ) Quarter ended March 31, 2020 Net gains on loans acquired for sale Net gains (losses) on investments Net loan servicing fees Net interest (expense) income Total (in thousands) Assets: Mortgage-backed securities at fair value $ — $ 115,967 $ — $ (12,002 ) $ 103,965 Loans acquired for sale at fair value 147,558 — — — 147,558 Loans at fair value — (4,010 ) — 293 (3,717 ) ESS at fair value — (14,522 ) — 1,974 (12,548 ) Credit risk transfer strips — (215,125 ) — — (215,125 ) Firm commitment to purchase CRT securities at fair value (26,649 ) (492,513 ) — — (519,162 ) MSRs at fair value — — (627,201 ) — (627,201 ) $ 120,909 $ (610,203 ) $ (627,201 ) $ (9,735 ) $ (1,126,230 ) Liabilities: Interest-only security payable at fair value $ — $ 11,575 $ — $ — $ 11,575 Asset-backed financing of a VIE at fair value — 1,928 — (2,491 ) (563 ) $ — $ 13,503 $ — $ (2,491 ) $ 11,012
Summary of Carrying Value of Financial Statement Items Re-measured Based on Fair Value on Nonrecurring Basis	Following is a summary of the carrying value of assets that were re-measured during the quarter based on fair value on a nonrecurring basis: Real estate acquired in settlement of loans Level 1 Level 2 Level 3 Total (in thousands) March 31, 2021 $ — $ — $ 11,161 $ 11,161 December 31, 2020 $ — $ — $ 12,656 $ 12,656
Summary of Changes in Fair Value Recognized in Assets that Remeasured at Fair Value on a Nonrecurring Basis	The following table summarizes the fair value changes recognized during the quarter on assets held at quarter end that were remeasured at fair value on a nonrecurring basis: Quarter ended March 31, 2021 2020 (in thousands) Real estate asset acquired in settlement of loans $ (649 ) $ (1,191 )
Fair Values of Notes Payable Secured by Credit Risk Transfer and Mortgage Servicing Rights and Exchangeable Senior Notes	Following are the fair values of the Notes payable secured by credit risk transfer and mortgage servicing assets Exchangeable senior notes March 31, 2021 December 31, 2020 Instrument Carrying value Fair value Carrying value Fair value (in thousands) Notes payable secured by credit risk transfer and mortgage servicing assets $ 2,897,794 $ 2,803,523 $ 1,924,999 $ 1,871,276 Exchangeable senior notes $ 494,097 $ 563,526 $ 196,796 $ 207,428
Summary of Key Inputs Used in Determining Fair Value of ESS	Following are the key inputs used in determining the fair value of ESS: December 31, 2020 Fair value (in thousands) $ 131,750 UPB of underlying loans (in thousands) $ 15,833,050 Average servicing fee rate (in basis points) 34 Average ESS rate (in basis points) 19 Key inputs (1) Pricing spread (2) Range 4.9% – 5.3% Weighted average 5.1% Annual total prepayment speed (3) Range 9.6% – 18.3% Weighted average 11.7% Equivalent life (in years) Range 2.3 - 6.6 Weighted average 5.8 (1) Weighted-average inputs are based on UPB of the underlying loans. (2) Pricing spread represents a margin that is applied to a reference forward rate to develop periodic discount rates. The Company applies pricing spreads to the forward rates implied by the United States Dollar London Interbank Offered Rate (“LIBOR”)/ swap curve for purposes of discounting cash flows relating to ESS. (3) Prepayment speed is measured using Life Total Conditional Prepayment Rate (“CPR”). Equivalent life is provided for informational purposes.
Quantitative Summary of Key Unobservable Inputs Used in Valuation of CRT Agreements	Following is a quantitative summary of key unobservable inputs used in the Company’s review and approval of broker-provided fair values for CRT derivatives: March 31, 2021 December 31, 2020 (dollars in thousands) Fair value CRT derivatives: Assets $ 58,134 $ 58,699 Liabilities $ 13,458 $ 26,904 UPB of loans in reference pools $ 11,539,702 $ 13,854,426 Key inputs (1) Discount rate Range 6.0% – 7.3% 6.7% – 9.0% Weighted average 7.1% 7.3% Voluntary prepayment speed (2) Range 13.0% – 13.6% 20.8% – 23.5% Weighted average 13.1% 21.9% Involuntary prepayment speed (3) Range (0.5)% – 1.2% (0.8)% – 1.1% Weighted average (0.1)% (0.2)% Remaining loss expectation (4) Range (0.6)% – 0.6% (0.6)% – 0.6% Weighted average (0.2)% (0.3)% (1) Weighted average inputs are based on fair value amounts of the CRT Agreements. (2) Voluntary prepayment speed is measured using Life Voluntary CPR. (3) Involuntary prepayment speed is measured using Life Involuntary CPR. The negative involuntary prepayment speed reflects the expectation for reinstatement to the reference pool of a significant portion of the loans that previously triggered losses due to delinquency while under CARES Act forbearance upon their projected re-performance, as contractually provided for in certain CRT Agreements. (4) Remaining loss expectation is measured as expected future contractual losses divided by the UPB of the reference loans. The negative remaining loss expectation reflects the expectation of contractual reversals of previously incurred contractual losses due to the projected re-performance of a significant portion of the reference loans in the future.
Quantitative Summary of Key Unobservable Inputs Used in Valuation of Interest Rate Lock Commitments	Following is a quantitative summary of key unobservable inputs used in the valuation of IRLCs: March 31, 2021 December 31, 2020 Fair value (in thousands) (1) $ (64,858 ) $ 72,386 Key inputs (2) Pull-through rate Range 42.0% – 100% 44.6% – 100% Weighted average 92.9% 86.3% MSR fair value expressed as Servicing fee multiple Range 1.2 – 6.5 2.0 – 5.3 Weighted average 5.0 4.4 Percentage of UPB Range 0.3% – 2.1% 0.5% – 1.9% Weighted average 1.3% 1.2% (1) For purposes of this table, IRLC asset and liability positions are shown net. (2) Weighted-average inputs are based on the committed amounts.
Summary of Key Unobservable Inputs Used in Valuation of Credit Risk Transfer Strips	Following is a quantitative summary of key unobservable inputs used in the Company’s review and approval of the adjusted broker-provided fair values used to derive the value of the CRT strips: March 31, 2021 December 31, 2020 (dollars in thousands) Carrying value CRT strip liabilities $ 109,570 $ 202,792 UPB of loans in the reference pools $ 36,863,982 $ 44,843,516 Key inputs (1) Discount rate Range 6.4% – 8.0% 6.0% – 8.4% Weighted average 7.8% 8.0% Voluntary prepayment speed (2) Range 15.7% – 18.6% 25.0% – 30.2% Weighted average 16.2% 26.2% Involuntary prepayment speed (3) Range 0.5% – 1.1% 0.8% – 1.7% Weighted average 0.6% 1.0% Remaining loss expectation (4) Range 0.3% – 0.7% 0.3% – 0.6% Weighted average 0.4% 0.4% (1) Weighted average inputs are based on the UPB of the loans in the reference pools. (2) Voluntary prepayment speed is measured using Life Voluntary CPR. (3) Involuntary prepayment speed is measured using Life Involuntary CPR. (4) Remaining loss expectation is measured as expected future losses divided by the UPB of the loans in the reference pools.
Key Assumptions Used in Determining Fair Value of MSRs at Time of Initial Recognition	Following are the key inputs used in determining the fair value of MSRs at the time of initial recognition: Quarter ended March 31, 2021 2020 (MSR recognized and UPB of underlying loans amounts in thousands) MSR recognized $ 407,696 $ 248,822 UPB of underlying loans $ 32,448,891 $ 19,341,270 Weighted average annual servicing fee rate (in basis points) 26 30 Key inputs (1) Pricing spread (2) Range 8.0% – 8.0% 6.7% – 9.9% Weighted average 8.0% 6.8% Prepayment speed (3) Range 6.0% – 9.3% 9.9% – 20.9% Weighted average 7.5% 12.2% Equivalent average life (in years) Range 3.9 – 8.9 3.6 – 6.9 Weighted average 8.5 6.5 Annual per-loan cost of servicing Range $81 – $81 $78 – $78 Weighted average $81 $78 (1) Weighted average inputs are based on UPB of the underlying loans. (2) The Company applies pricing spreads to the forward rates implied by the United States Dollar LIBOR/swap curve for purposes of discounting cash flows relating to MSRs. (3) Prepayment speed is measured using Life Total CPR, which includes both voluntary and involuntary prepayments. Equivalent average life is provided for informational purposes.
Quantitative Summary of Key Assumptions Used in Valuation of MSRs as of Dates Presented, and Effect on Estimated Fair Value from Adverse Changes in Those Inputs	Following is a quantitative summary of key inputs used in the valuation of MSRs as of the dates presented, and the effect on the fair value from adverse changes in those inputs: March 31, 2021 December 31, 2020 (Fair value, UPB of underlying loans and effect on fair value amounts in thousands) Fair value $ 2,441,214 $ 1,755,236 UPB of underlying loans $ 183,463,662 $ 170,728,322 Weighted average annual servicing fee rate (in basis points) 27 28 Weighted average note interest rate 3.4% 3.6% Key inputs (1): Pricing spread (2) Range 6.8% – 9.9% 8.0% – 11.1% Weighted average 6.8% 8.0% Effect on fair value of: 5% adverse change $(38,465) $(31,400) 10% adverse change $(75,820) $(61,718) 20% adverse change $(147,372) $(119,305) Prepayment speed (3) Range 8.5% – 24.2% 12.4% – 28.8% Weighted average 8.8% 12.8% Equivalent average life (in years) Range 3.1 – 8.1 2.9 – 6.8 Weighted average 7.8 6.5 Effect on fair value of: 5% adverse change $(48,777) $(48,136) 10% adverse change $(95,920) $(94,244) 20% adverse change $(185,623) $(180,820) Annual per-loan cost of servicing Range $78 – $149 $78 – $121 Weighted average $80 $81 Effect on fair value of: 5% adverse change $(15,709) $(11,846) 10% adverse change $(31,419) $(23,692) 20% adverse change $(62,838) $(47,385) (1) Weighted-average inputs are based on the UPB of the underlying loans. (2) The Company applies pricing spreads to the forward rates implied by the United States Dollar LIBOR/swap curve for purposes of discounting cash flows relating to MSRs. (3) Prepayment speed is measured using Life Total CPR, which includes both voluntary and involuntary prepayments. Equivalent average life is provided for informational purposes.

Mortgage-Backed Securities (Tab

Mortgage-Backed Securities (Tables)	3 Months Ended
Mortgage-Backed Securities (Tables)	Mar. 31, 2021
Mortgage Backed Securities [Abstract]
Schedule of Investment in Mortgage Backed Securities Activity	Following is a summary of activity in the Company’s investment in MBS: Quarter ended March 31, 2021 2020 (in thousands) Balance at beginning of quarter $ 2,213,922 $ 2,839,633 Purchases 1,259,189 1,615,486 Sales (1,300,653 ) (488,729 ) Repayments (182,333 ) (122,935 ) Changes in fair value included in income arising from: Amortization of net purchase premiums (2,523 ) (12,002 ) Valuation adjustments (71,117 ) 115,967 (73,640 ) 103,965 Balance at end of quarter $ 1,916,485 $ 3,947,420
Schedule of Investment in Mortgage Backed Securities	Following is a summary of the Company’s investment in MBS: March 31, 2021 December 31, 2020 Agency: (1) Principal balance Unamortized net purchase premiums Accumulated valuation changes Fair value Principal balance Unamortized net purchase premiums Accumulated valuation changes Fair value (in thousands) Freddie Mac $ 654,051 $ 20,729 $ (21,741 ) $ 653,039 $ 1,253,755 $ 32,414 $ 24,867 $ 1,311,036 Fannie Mae 1,263,614 40,262 (40,430 ) 1,263,446 863,758 23,692 15,436 902,886 $ 1,917,665 $ 60,991 $ (62,171 ) $ 1,916,485 $ 2,117,513 $ 56,106 $ 40,303 $ 2,213,922 (1) All MBS are fixed-rate pass-through securities with maturities of more than ten years and are pledged to secure Assets sold under agreements to repurchase

Loans Acquired for Sale at Fa_2

Loans Acquired for Sale at Fair Value (Tables)	3 Months Ended
Loans Acquired for Sale at Fair Value (Tables)	Mar. 31, 2021
Mortgage Loans On Real Estate [Abstract]
Summary of Distribution of Company's Loans Acquired for Sale at Fair Value	Following is a summary of the distribution of the Company’s loans acquired for sale at fair value: Loan type March 31, 2021 December 31, 2020 (in thousands) Agency-eligible $ 4,284,646 $ 3,057,601 Held for sale to PLS — Government insured or guaranteed 327,881 460,414 Home equity lines of credit 4,864 5,566 Commercial real estate 998 1,010 Repurchased pursuant to representations and warranties 28,372 27,299 $ 4,646,761 $ 3,551,890 Loans pledged to secure: Assets sold under agreements to repurchase $ 4,519,274 $ 3,484,202 Mortgage loan participation purchase and sale agreements 70,919 17,645 $ 4,590,193 $ 3,501,847

Loans at Fair Value (Tables)

Loans at Fair Value (Tables)	3 Months Ended
Loans at Fair Value (Tables)	Mar. 31, 2021
Mortgage Loans At Fair Value [Abstract]
Summary of Distribution of Company's Loans at Fair Value	Following is a summary of the distribution of the Company’s loans at fair value: Loan type March 31, 2021 December 31, 2020 (in thousands) Fixed interest rate jumbo loans held in a VIE $ 109,845 $ 143,707 Distressed loans 7,802 8,027 $ 117,647 $ 151,734 Loans at fair value pledged to secure: Asset-backed financing of a VIE at fair value $ 109,845 $ 143,707 Assets sold under agreements to repurchase 1,383 3,703 $ 111,228 $ 147,410

Derivative and Credit Risk Tr_2

Derivative and Credit Risk Transfer Strip Assets and Liabilities (Tables)	3 Months Ended
	Mar. 31, 2021
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Summary of Derivative and Credit Risk Transfer Assets and Liabilities	Derivative and credit risk transfer assets and liabilities are summarized below: March 31, 2021 December 31, 2020 (in thousands) Derivative assets $ 182,969 $ 164,318 Credit risk transfer strip assets — — $ 182,969 $ 164,318 Derivative liabilities $ 120,400 $ 60,681 Credit risk transfer strip liabilities 109,570 202,792 $ 229,970 $ 263,473
Derivative Assets and Derivative Liabilities and Related Margin Deposits Recorded in Other Assets	The Company had the following derivative assets and liabilities recorded within Derivative assets Derivative liabilities Other March 31, 2021 December 31, 2020 Fair value Fair value Notional Derivative Derivative Notional Derivative Derivative Instrument amount (1) assets liabilities amount (1) assets liabilities (in thousands) Subject to master netting agreements ─ economic hedging purposes (2): Call options on interest rate futures purchase contracts 2,550,000 $ 992 $ — 1,450,000 $ 3,070 $ — Put options on interest rate futures purchase contracts 3,750,000 18,938 — 2,800,000 4,742 — Put options on interest rate futures sale contracts 562,500 — 6,064 — — — Forward purchase contracts 15,169,597 6,687 89,312 17,563,549 72,526 17 Forward sale contracts 24,946,663 182,192 6,965 26,615,716 92 122,884 MBS put options 3,600,000 51,165 9,657 3,625,000 3,220 — Swaption purchase contracts 3,136,300 29,034 — 3,655,000 8,505 — Swap futures 2,750,000 — — 1,950,000 — — Bond futures 401,500 — — 66,500 — — Not subject to master netting arrangements: CRT derivatives 11,539,702 58,134 13,458 13,854,426 58,699 26,904 Interest rate lock commitments 8,525,688 7,552 72,410 10,588,208 72,794 408 Total derivative instruments before netting 354,694 197,866 223,648 150,213 Netting (171,725 ) (77,466 ) (59,330 ) (89,532 ) $ 182,969 $ 120,400 $ 164,318 $ 60,681 Margin deposits (received from) placed with derivatives counterparties, net $ (94,258 ) $ 30,197 Derivative assets pledged to secure: Notes payable secured by credit risk transfer and mortgage servicing assets $ 58,134 $ 58,699 (1) Notional amounts provide an indication of the volume of the Company’s derivative activity. (2) All hedging derivatives are interest rate derivatives that are used as economic hedges.
Summary of Net Derivative Assets	Following is a summary of net derivative assets: March 31, 2021 December 31, 2020 Gross amounts of recognized assets Gross amounts offset in the consolidated balance sheet Net amounts of assets presented in the consolidated balance sheet Gross amounts of recognized assets Gross amounts offset in the consolidated balance sheet Net amounts of assets presented in the consolidated balance sheet (in thousands) Derivative assets Subject to master netting arrangements: Call options on interest rate futures purchase contracts $ 992 $ — $ 992 $ 3,070 $ — $ 3,070 Put options on interest rate futures purchase contracts 18,938 — 18,938 4,742 — 4,742 Forward purchase contracts 6,687 — 6,687 72,526 — 72,526 Forward sale contracts 182,192 — 182,192 92 — 92 MBS put options 51,165 — 51,165 3,220 — 3,220 Swaption purchase contracts 29,034 — 29,034 8,505 — 8,505 Netting — (171,725 ) (171,725 ) — (59,330 ) (59,330 ) 289,008 (171,725 ) 117,283 92,155 (59,330 ) 32,825 Not subject to master netting arrangements: CRT derivatives 58,134 — 58,134 58,699 — 58,699 Interest rate lock commitments 7,552 — 7,552 72,794 — 72,794 65,686 — 65,686 131,493 — 131,493 $ 354,694 $ (171,725 ) $ 182,969 $ 223,648 $ (59,330 ) $ 164,318
Summary of Derivative Assets, Financial Instruments and Collateral Held by Counterparty	The following table summarizes by significant counterparty the amount of derivative asset positions after considering master netting arrangements and financial instruments or cash pledged that do not meet the accounting guidance qualifying for setoff accounting. March 31, 2021 December 31, 2020 Net amount Gross amounts Net amount Gross amounts of assets not offset in the of assets not offset in the presented consolidated presented consolidated in the balance sheet in the balance sheet consolidated Cash consolidated Cash balance Financial collateral Net balance Financial collateral Net sheet instruments received amount sheet instruments received amount (in thousands) CRT derivatives $ 58,134 $ — $ — $ 58,134 $ 58,699 $ — $ — $ 58,699 Interest rate lock commitments 7,552 — — 7,552 72,794 — — 72,794 Federal Home Loan Mortgage Corporation 31,652 — — 31,652 — — — — J.P. Morgan Securities LLC 29,455 — — 29,455 — — — — Wells Fargo Securities, LLC 16,087 — — 16,087 — — — — RJ O’Brien & Associates, LLC 13,865 — — 13,865 7,813 — — 7,813 Bank of America, N.A. 13,191 — — 13,191 15,406 — — 15,406 Morgan Stanley & Co. LLC 7,949 — — 7,949 — — — — Citigroup Global Markets Inc. 3,431 — — 3,431 2,416 — — 2,416 PNC Capital Markets LLC 13 — — 13 3,138 — — 3,138 Deutsche Bank Securities LLC — — — — 1,602 — — 1,602 Mitsubishi UFJ Sec — — — — 1,070 — — 1,070 Other 1,640 — — 1,640 1,380 — — 1,380 $ 182,969 $ — $ — $ 182,969 $ 164,318 $ — $ — $ 164,318
Schedule of Offsetting of Derivative Liabilities and Financial Liabilities	Following is a summary of net derivative liabilities and assets sold under agreements to repurchase. Assets sold under agreements to repurchase do not qualify for setoff accounting. March 31, 2021 December 31, 2020 Gross amounts of recognized liabilities Gross amounts offset in the consolidated balance sheet Net amounts of liabilities presented in the consolidated balance sheet Gross amounts of recognized liabilities Gross amounts offset in the consolidated balance sheet Net amounts of liabilities presented in the consolidated balance sheet (in thousands) Derivative liabilities: Subject to master netting arrangements: Put options on interest rate futures sale contracts $ 6,064 $ — $ 6,064 $ — $ — $ — Forward purchase contracts 89,312 — 89,312 17 — 17 Forward sales contracts 6,965 — 6,965 122,884 — 122,884 MBS put options 9,657 — 9,657 — — — Netting — (77,466 ) (77,466 ) — (89,532 ) (89,532 ) 111,998 (77,466 ) 34,532 122,901 (89,532 ) 33,369 Not subject to master netting arrangements CRT derivatives 13,458 — 13,458 26,904 — 26,904 Interest rate lock commitments 72,410 — 72,410 408 — 408 197,866 (77,466 ) 120,400 150,213 (89,532 ) 60,681 Assets sold under agreements to repurchase: UPB 6,098,299 — 6,098,299 6,317,928 — 6,317,928 Unamortized debt issuance costs (6,326 ) — (6,326 ) (8,510 ) — (8,510 ) 6,091,973 — 6,091,973 6,309,418 — 6,309,418 $ 6,289,839 $ (77,466 ) $ 6,212,373 $ 6,459,631 $ (89,532 ) $ 6,370,099
Summary of Derivative Liabilities, Financial Liabilities and Collateral Pledged by Counterparty	The following table summarizes by significant counterparty the amount of derivative liabilities and assets sold under agreements to repurchase after considering master netting arrangements and financial instruments or cash pledged that do not qualify for setoff accounting. All assets sold under agreements to repurchase represent sufficient collateral or exceed the liability amount recorded on the consolidated balance sheet. March 31, 2021 December 31, 2020 Net amount Gross amounts Net amount Gross amounts of liabilities not offset in the of liabilities not offset in the presented consolidated presented consolidated in the balance sheet in the balance sheet consolidated Cash consolidated Cash balance Financial collateral Net balance Financial collateral Net sheet instruments pledged amount sheet instruments pledged amount (in thousands) Interest rate lock commitments $ 72,410 $ — $ — $ 72,410 $ 408 $ — $ — $ 408 CRT derivatives 13,458 — — 13,458 26,904 — — 26,904 Credit Suisse Securities (USA) LLC 1,230,324 (1,209,194 ) — 21,130 1,059,547 (1,054,636 ) — 4,911 Bank of America, N.A. 1,031,487 (1,031,487 ) — — 414,044 (414,044 ) — — RBC Capital Markets, L.P. 750,308 (750,308 ) — — 765,892 (765,892 ) — — J.P. Morgan Securities LLC 642,606 (642,606 ) — — 359,573 (357,211 ) — 2,362 Daiwa Capital Markets 534,521 (534,032 ) — 489 728,207 (727,562 ) — 645 Barclays Capital Inc. 504,410 (504,410 ) — — 922,959 (922,035 ) — 924 Morgan Stanley & Co. LLC 393,370 (393,370 ) — — 367,493 (366,415 ) — 1,078 Citigroup Global Markets Inc. 261,628 (261,628 ) — — 830,161 (830,161 ) — — Goldman Sachs & Co. LLC 264,058 (261,528 ) — 2,530 149,272 (144,883 ) — 4,389 BNP Paribas 227,034 (227,034 ) — — 164,414 (163,548 ) — 866 Wells Fargo Securities, LLC 143,150 (143,150 ) — — 148,854 (140,796 ) — 8,058 Amherst Pierpont Securities LLC 139,552 (139,552 ) — — 153,224 (153,224 ) — — Mitsubishi UFJ Sec 4,788 — — 4,788 — — — — Bank of Oklahoma 3,304 — — 3,304 — — — — Mizuho Securities 1,059 — — 1,059 279,321 (277,521 ) — 1,800 Federal Home Loan Mortgage Corporation — — — — 5,883 — — 5,883 Other 1,232 — — 1,232 2,453 — — 2,453 $ 6,218,699 $ (6,098,299 ) $ — $ 120,400 $ 6,378,609 $ (6,317,928 ) $ — $ 60,681
Net Gains (Losses) Recognized on Derivative Financial Instruments	Following are the net gains (losses) recognized by the Company on derivative financial instruments and the consolidated statements of operations line items where such gains and losses are included: Quarter ended March 31, Derivative activity Consolidated statement of operations line 2021 2020 (in thousands) Interest rate lock commitments Net gains on loans acquired for sale (1) $ (137,243 ) $ 68,231 CRT derivatives Net gains (losses) on investments $ 36,370 $ (215,125 ) Hedged item: Interest rate lock commitments and loans acquired for sale Net gains on loans acquired for sale $ 297,476 $ (140,368 ) Mortgage servicing rights Net loan servicing fees $ (374,403 ) $ 767,186 Fixed-rate and prepayment sensitive assets and LIBOR-indexed repurchase agreements Net gains (losses) on investments $ (24 ) $ 64,931 (1) Represents net increase in fair value of IRLCs from the beginning to the end of the reporting period. Amounts recognized at the date of commitment and fair value changes recognized during the period until purchase of the underlying loan are shown in the rollforward of IRLCs for the period in Note 7– Fair Value - Financial Statement Items Measured at Fair Value on a Recurring Basis .
Summary of Holdings of CRT Strips	Following is a summary of the Company’s holdings of CRT strips Credit risk transfer strips contractually restricted from sale (1) March 31, 2021 December 31, 2020 (in thousands) Liabilities Through December 4, 2021 $ 26,910 $ 168,539 To maturity 82,660 34,253 $ 109,570 $ 202,792 (1) The terms of the agreement underlying the CRT securities restricts sales of the securities, other than under agreements to repurchase, without the approval of Fannie Mae, for specified periods from the date of issuance.

Mortgage Servicing Rights (Tabl

Mortgage Servicing Rights (Tables)	3 Months Ended
Mortgage Servicing Rights (Tables)	Mar. 31, 2021
Text Block [Abstract]
Summary of MSRs Carried at Fair Value	Following is a summary of MSRs: Quarter ended March 31, 2021 2020 (in thousands) Balance at beginning of quarter $ 1,755,236 $ 1,535,705 MSRs resulting from loan sales 407,696 248,822 Changes in fair value: Due to changes in valuation inputs used in valuation model (1) 337,667 (563,247 ) Other changes in fair value (2) (59,385 ) (63,954 ) 278,282 (627,201 ) Balance at end of quarter $ 2,441,214 $ 1,157,326 March 31, 2021 December 31, 2020 (in thousands) Fair value of mortgage servicing rights pledged to secure Assets sold under agreements to repurchase and risk transfer and mortgage servicing assets $ 2,423,063 $ 1,742,905 (1) Primarily reflects changes in pricing spread (discount rate), prepayment speed, and servicing cost inputs. (2) Represents changes due to realization of expected cash flows.
Summary of Net Loan Servicing Fees Relating to MSRs	Servicing fees relating to MSRs are recorded in Net loan servicing fees – from nonaffiliates Quarter ended March 31, 2021 2020 (in thousands) Contractually-specified servicing fees $ 116,287 $ 94,469 Ancillary and other fees: Late charges 412 500 Other 15,833 6,691 $ 132,532 $ 101,660

Short-Term Borrowings (Tables)

Short-Term Borrowings (Tables)	3 Months Ended
Short-Term Borrowings (Tables)	Mar. 31, 2021
Summary of Financial Information Relating to Assets Sold under Agreements to Repurchase	Following is a summary of financial information relating to assets sold under agreements to repurchase: Quarter ended March 31, 2021 2020 (dollars in thousands) Weighted average interest rate (1) 1.60 % 2.31 % Average balance $ 5,971,290 $ 6,302,900 Total interest expense $ 28,659 $ 37,750 Maximum daily amount outstanding $ 7,208,807 $ 8,664,587 (1) Excludes the effect of amortization of debt issuance costs of $5.2 million and $1.4 million for the quarters ended March 31, 2021 and 2020, respectively. March 31, 2021 December 31, 2020 (dollars in thousands) Carrying value: Unpaid principal balance $ 6,098,299 $ 6,317,928 Unamortized debt issuance costs (6,326 ) (8,510 ) $ 6,091,973 $ 6,309,418 Weighted average interest rate 1.65 % 1.36 % Available borrowing capacity (1): Committed $ 240,290 $ 483,767 Uncommitted 3,416,352 4,151,905 $ 3,656,642 $ 4,635,672 Margin deposits placed with counterparties included in Other $ 13,966 $ 141,808 Assets securing agreements to repurchase: Mortgage-backed securities $ 1,916,485 $ 2,213,922 Loans acquired for sale at fair value $ 4,519,274 $ 3,484,202 Loans at fair value $ 1,383 $ 3,703 MSRs (2) $ 1,537,749 $ 1,166,090 Real estate acquired in settlement of loans $ 10,250 $ 15,365 Deposits securing CRT arrangements $ — $ 2,799,263 (1) The amount the Company is able to borrow under asset repurchase agreements is tied to the fair value of unencumbered assets eligible to secure those agreements and the Company’s ability to fund the agreements’ margin requirements relating to the assets financed. (2) Beneficial interests in Fannie Mae MSRs are pledged as collateral under both Assets sold under agreements to repurchase and Notes payable secured by credit risk transfer and mortgage servicing assets .
Summary of Maturities of Outstanding Advances Under Repurchase Agreements by Maturity Date	Following is a summary of maturities of outstanding advances under repurchase agreements by maturity date: Remaining maturity at March 31, 2021 Unpaid principal balance (in thousands) Within 30 days $ 1,879,732 Over 30 to 90 days 3,468,259 Over 90 days to 180 days 750,308 $ 6,098,299 Weighted average maturity (in months) 1.9
Summary of Assets Sold under Agreements to Repurchase by Counterparty	Securities Counterparty Amount at risk Weighted average maturity (in thousands) Bank of America, N.A. $ 10,793 April 14, 2021 JPMorgan Chase & Co. $ 17,117 April 8, 2021 Barclays Capital Inc. $ 8,732 April 15, 2021 Daiwa Capital Markets America Inc. $ 14,961 April 16, 2021 Amherst Pierpont Securities LLC $ 4,488 April 16, 2021
Loans RE and MSRs Sold Under Agreements to Repurchase [Member]
Summary of Assets Sold under Agreements to Repurchase by Counterparty	Loans, REO and MSRs Counterparty Amount Weighted average maturity Facility maturity (in thousands) Bank of America, N.A. $ 119,373 May 3, 2021 June 9, 2021 Credit Suisse First Boston Mortgage Capital LLC $ 75,611 April 23, 2021 April 23, 2021 RBC Capital Markets, L.P. $ 32,331 July 15, 2021 November 10, 2021 JPMorgan Chase & Co. $ 13,559 April 7, 2021 April 7, 2021 Barclays Capital Inc. $ 18,223 June 3, 2021 November 3, 2022 Morgan Stanley & Co. LLC $ 18,714 June 21, 2021 November 2, 2022 Citibank, N.A. $ 10,807 May 22, 2021 August 3, 2021 Goldman Sachs & Co. LLC $ 9,460 June 21, 2021 December 23, 2022 BNP Paribas $ 7,646 June 13, 2021 July 30, 2021 Wells Fargo Securities, LLC $ 5,141 June 21, 2021 October 6, 2022

Mortgage Loan Participation Pur

Mortgage Loan Participation Purchase and Sale Agreements (Tables)	3 Months Ended
	Mar. 31, 2021
Text Block [Abstract]
Summary of Mortgage Loan Participation Purchase and Sale Agreements	Mortgage loan participation purchase and sale agreements are summarized below: Quarter ended March 31, 2021 2020 (dollars in thousands) Weighted average interest rate (1) 1.38 % 2.73 % Average balance $ 39,162 $ 41,301 Total interest expense $ 164 $ 338 Maximum daily amount outstanding $ 82,571 $ 94,387 (1) Excludes the effect of amortization of debt issuance costs of $31,000 and $57,000 for the quarters ended March 31, 2021 and 2020, respectively. March 31, 2021 December 31, 2020 (dollars in thousands) Carrying value: Amount outstanding $ 68,176 $ 16,851 Unamortized debt issuance costs — — $ 68,176 $ 16,851 Weighted average interest rate 1.36 % 1.39 % Loans acquired for sale pledged to secure mortgage loan participation purchase and sale agreements $ 70,919 $ 17,645

Long-Term Debt (Tables)

Long-Term Debt (Tables)	3 Months Ended
Long-Term Debt (Tables)	Mar. 31, 2021
Debt Disclosure [Abstract]
Summary of Term Note Issued to Qualified Institutional Buyers	Following is a summary of the secured CRT Term Notes issued: Maturity date (2) Term Notes Issuance date Issuance amount Unpaid principal balance Annual interest rate spread (1) Stated Optional extension (in thousands) 2021 1R March 04, 2021 $ 659,156 $ 657,070 2.90 % February 28, 2024 February 27, 2026 2020 2R December 22, 2020 $ 500,000 496,909 3.81 % December 28, 2022 — 2020 1R February 14, 2020 $ 350,000 156,016 2.35 % March 1, 2023 February 27, 2025 2019 3R October 16, 2019 $ 375,000 151,523 2.70 % October 27, 2022 October 29, 2024 2019 2R June 11, 2019 $ 638,000 408,000 2.75 % May 29, 2023 May 29, 2025 2019 1R March 29, 2019 $ 295,700 139,269 2.00 % March 29, 2022 March 27, 2024 $ 2,008,787 (1) Spread over 1-month LIBOR. (2) The indentures relating to these issuances provide the Company with the option of extending the maturity dates of the Term Notes under the conditions specified in respective agreements.
Summary of Financial Information Relating to Note Payable	Following is a summary of financial information relating to the notes payable: Quarter ended March 31, 2021 2020 (dollars in thousands) Weighted average interest rate (1) 3.14 % 4.10 % Average balance $ 2,260,721 $ 1,860,213 Total interest expense $ 18,599 $ 19,618 Maximum daily amount outstanding $ 3,180,115 $ 2,032,665 (1) Excludes the effect of amortization of debt issuance costs of $1.1 million and $609,000 for the quarters ended March 31, 2021 and 2020, respectively. March 31, 2021 December 31, 2020 (dollars in thousands) Carrying value: Amount outstanding $ 2,908,788 $ 1,930,018 Unamortized debt issuance costs (10,994 ) (5,019 ) $ 2,897,794 $ 1,924,999 Weighted average interest rate 2.93 % 2.99 % Assets securing notes payable: MSRs (1) $ 2,423,063 $ 1,742,905 CRT Agreements: Deposits securing CRT arrangements $ 2,664,420 $ 2,799,263 Derivative assets $ 58,134 $ 58,699 (1) Beneficial interests in Freddie Mac and Fannie Mae MSRs are pledged as collateral for both Assets sold under agreements to repurchase and Notes payable secured by credit risk transfer and mortgage servicing assets
Summary of Financial Information Relating to Exchangeable Notes	Following is financial information relating to the Exchangeable Notes: Quarter ended March 31, 2021 2020 (in thousands) Average balance $ 298,554 $ 460,000 Total interest expense $ 5,542 $ 7,266 March 31, 2021 December 31, 2020 (in thousands) Carrying value: UPB $ 555,000 $ 210,000 Unamortized debt issuance costs and conversion option (60,903 ) (13,204 ) $ 494,097 $ 196,796
Summary of Financial Information Relating to Asset-Backed Financing of a VIE at Fair Value	Following is a summary of financial information relating to the asset-backed financing of a VIE at fair value described in Note 6 — Variable Interest Entities-Jumbo Loan Financing Quarter ended March 31, 2021 2020 (dollars in thousands) Average balance $ 120,415 $ 240,765 Total interest expense $ 168 $ 4,527 Weighted average interest rate 3.22 % 3.39 % March 31, 2021 December 31, 2020 (dollars in thousands) Fair value $ 101,238 $ 134,726 UPB $ 100,036 $ 131,835 Weighted average interest rate 3.57 % 3.56 %
Schedule of Annual Maturities on Long Term Debt Obligations	Maturity of Long-Term Debt Annual maturities of long-term debt obligations (based on final maturity dates) are as follows: Twelve months ended March 31, Total 2022 2023 2024 2025 2026 Thereafter (in thousands) Notes payable secured by credit risk transfer and mortgage servicing assets (1) $ 2,808,788 $ 139,269 $ 804,448 $ 1,515,071 $ — $ 350,000 $ — Exchangeable senior notes 555,000 — — — 210,000 345,000 — Asset-backed financing of a variable interest entity at fair value (2) 100,036 — — — — — 100,036 Interest-only security payable at fair value (2) 18,922 — — — — — 18,922 Total $ 3,482,746 $ 139,269 $ 804,448 $ 1,515,071 $ 210,000 $ 695,000 $ 118,958

Liability for Losses Under Re_2

Liability for Losses Under Representations and Warranties (Tables)	3 Months Ended
	Mar. 31, 2021
Liability For Representations And Warranties [Abstract]
Summary of Company's Liability for Losses under Representations and Warranties	Following is a summary of the Company’s liability for losses under representations and warranties: Quarter ended March 31, 2021 2020 (in thousands) Balance, beginning of quarter $ 21,893 $ 7,614 Provision for losses: Pursuant to loan sales 8,513 1,030 Reduction in liability due to change in estimate (1,424 ) (1,344 ) Losses incurred, net (15 ) — Balance, end of quarter $ 28,967 $ 7,300 UPB of loans subject to representations and warranties at end of quarter $ 177,595,762 $ 131,049,135

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
Commitments and Contingencies (Tables)	Mar. 31, 2021
Commitments And Contingencies Disclosure [Abstract]
Company's Outstanding Contractual Commitments	The following table summarizes the Company’s outstanding contractual commitments: March 31, 2021 (in thousands) Commitments to purchase loans acquired for sale $ 8,525,688

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	3 Months Ended
Shareholders' Equity (Tables)	Mar. 31, 2021
Equity [Abstract]
Schedule of Preferred Shares of Beneficial Interest	Preferred shares of beneficial interest are summarized below: Preferred Dividends per share quarter ended March 31, Shared Series Description (1) Number of shares Liquidation preference Issuance discount Carrying value 2021 2020 Fixed-to-floating rate cumulative redeemable preferred (in thousands, except dividends per share) A 8.125% Issued March 2017 4,600 $ 115,000 $ 3,828 $ 111,172 $ 0.51 $ 0.51 B 8.00% Issued July 2017 7,800 195,000 6,465 188,535 $ 0.50 $ 0.50 12,400 $ 310,000 $ 10,293 $ 299,707 (1) Par value is $0.01 per share.
Summary of Activities under ATM Equity Offering Program	Following is a summary of the activities under the ATM equity offering program: Quarter ended March 31, 2020 (in thousands) Number of common shares issued 241 Gross proceeds $ 5,654 Net proceeds $ 5,597
Summary of Share Repurchase Activity	The following table summarizes the Company’s share repurchase activity: Quarter ended Cumulative March 31, 2020 total (1) (in thousands) Common shares repurchased 783 17,498 Cost of common shares repurchased $ 5,783 $ 253,892 (1) Amounts represent the share repurchase program total from its inception in August 2015 through March 31, 2021.

Net Gains on Loans Acquired f_2

Net Gains on Loans Acquired for Sale (Tables)	3 Months Ended
Net Gains on Loans Acquired for Sale (Tables)	Mar. 31, 2021
Text Block [Abstract]
Schedule of Net Gains on Loans Acquired for Sale	Net gains on loans acquired for sale are summarized below: Quarter ended March 31, 2021 2020 (in thousands) From nonaffiliates: Cash loss: Loans $ (592,789 ) $ (68,954 ) Hedging activities 463,276 (23,378 ) (129,513 ) (92,332 ) Non-cash gain: Recognition of fair value of firm commitment to purchase CRT securities — (26,649 ) Receipt of MSRs in mortgage loan sale transactions 407,696 248,822 Provision for losses relating to representations and warranties provided in mortgage loan sales: Pursuant to loans sales (8,513 ) (1,030 ) Reduction of liability due to change in estimate 1,424 1,344 (7,089 ) 314 Change in fair value of loans and derivatives held at end of quarter: IRLCs (137,243 ) 68,231 Loans 83,223 (36,782 ) Hedging derivatives (165,800 ) (116,990 ) (219,820 ) (85,541 ) 180,787 136,946 Total from nonaffiliates 51,274 44,614 From PFSI—cash gain 1,738 4,161 $ 53,012 $ 48,775

Net Gains (Losses) on Investm_2

Net Gains (Losses) on Investments (Tables)	3 Months Ended
Net Gains (Losses) on Investments (Tables)	Mar. 31, 2021
Investments Debt And Equity Securities [Abstract]
Summary of Net Gains (Losses) on Investments	Net gains (losses) on investments are summarized below: Quarter ended March 31, 2021 2020 (in thousands) From nonaffiliates: Mortgage-backed securities $ (71,117 ) $ 115,967 Loans at fair value: Held in a VIE (2,345 ) (2,869 ) Distressed 95 (1,142 ) CRT arrangements 154,031 (487,292 ) Firm commitment to purchase CRT securities — (492,513 ) Asset-backed financing of a VIE at fair value 900 1,928 Hedging derivatives (24 ) 64,931 81,540 (800,990 ) From PFSI—ESS 1,651 (14,141 ) $ 83,191 $ (815,131 )

Net Interest Income (Expense) (

Net Interest Income (Expense) (Tables)	3 Months Ended
Net Interest Income (Expense) (Tables)	Mar. 31, 2021
Banking And Thrift Interest [Abstract]
Summary of Net Interest Income	Net interest income is summarized below: Quarter ended March 31, 2021 2020 (in thousands) Interest income: From nonaffiliates: Cash and short-term investments $ 225 $ 1,627 Mortgage-backed securities 8,286 15,568 Loans acquired for sale at fair value 22,908 31,523 Loans at fair value: Held in a VIE 1,899 2,641 Distressed 253 59 Deposits securing CRT arrangements 168 6,099 Placement fees relating to custodial funds 2,532 12,398 Other 38 234 36,309 70,149 From PFSI—ESS 1,280 1,974 37,589 72,123 Interest expense: To nonaffiliates: Assets sold under agreements to repurchase 28,659 37,750 Mortgage loan participation purchase and sale agreements 164 338 Notes payable secured by credit risk transfer and mortgage servicing assets 18,599 19,618 Exchangeable Notes 5,542 7,266 Asset-backed financings of a VIE at fair value 168 4,527 Interest shortfall on repayments of loans serviced for Agency securitizations 22,040 9,439 Interest on loan impound deposits 749 912 75,921 79,850 To PFSI—Assets sold under agreement to repurchase 387 1,218 76,308 81,068 Net interest expense $ (38,719 ) $ (8,945 )

Share-Based Compensation (Table

Share-Based Compensation (Tables)	3 Months Ended
Share-Based Compensation (Tables)	Mar. 31, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Summary of Share-Based Compensation Activity	The following table summarizes the Company’s share-based compensation activity: Quarter ended March 31, 2021 2020 (in thousands) Grants: Restricted share units 101 92 Performance share units 84 112 Total share units granted 185 204 Grant date fair value: Restricted share units $ 1,917 $ 1,978 Performance share units 1,602 2,428 Total grant date value of share units $ 3,519 $ 4,406 Vestings: Restricted share units 100 123 Performance share units (1) 37 143 Total share units vested 137 266 Forfeitures: Restricted share units — — Performance share units — — Total share units forfeited — — Compensation expense relating to share-based grants $ 1,738 $ 186 (1) The actual number of performance-based RSUs that vested during the quarter ended March 31, 2021 was 37,000 common shares, which is 100% of the originally granted performance-based RSUs.
Summary of Restricted Share Units and Performance Share Units Expected to Vest	March 31, 2021 Restricted share units Performance share units Shares expected to vest: Number of units (in thousands) 190 251 Grant date average fair value per unit $ 20.07 $ 19.26

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
Earnings Per Share (Tables)	Mar. 31, 2021
Earnings Per Share [Abstract]
Summary of Basic and Diluted Earnings per Share	The following table summarizes the basic and diluted earnings per share calculations: Quarter ended March 31, 2021 2020 (in thousands except per share amounts) Net income (loss) $ 71,603 $ (594,673 ) Dividends on preferred shares (6,234 ) (6,234 ) Effect of participating securities—share-based compensation awards (120 ) (50 ) Net income (loss) attributable to common shareholders $ 65,249 $ (600,957 ) Weighted average basic shares outstanding 97,892 100,245 Dilutive securities-shares issuable under share-based compensation plan 211 — Diluted weighted average number of shares outstanding 98,103 100,245 Basic earnings (loss) per share $ 0.67 $ (5.99 ) Diluted earnings (loss) per share $ 0.67 $ (5.99 )
Summary of Potentially Dilutive Shares Excluded from Computation of Diluted Earnings Per Share	The following table summarizes the potentially dilutive shares excluded from the diluted earnings per share calculation as inclusion of such shares would have been antidilutive: Quarter ended March 31, 2021 2020 (in thousands) Shares issuable under share-based compensation plan 11 135 Shares issuable pursuant to exchange of the 2020 Notes — 8,467

Segments (Tables)

Segments (Tables)	3 Months Ended
Segments (Tables)	Mar. 31, 2021
Segment Reporting [Abstract]
Financial Highlights by Operating Segment	Financial highlights by operating segment are summarized below: Credit Interest rate sensitive sensitive Correspondent March 31, 2021 strategies strategies production Corporate Total (in thousands) Net investment income: Net (loss) gain on loans acquired for sale $ (1 ) $ — $ 53,013 $ — $ 53,012 Net gain (loss) on investments 154,271 (71,080 ) — — 83,191 Net loan servicing fees — 50,045 — — 50,045 Net interest expense: Interest income 650 13,516 22,797 626 37,589 Interest expense 17,261 37,316 21,731 — 76,308 (16,611 ) (23,800 ) 1,066 626 (38,719 ) Other 888 — 52,980 — 53,868 138,547 (44,835 ) 107,059 626 201,397 Expenses: Loan fulfillment and servicing fees payable to PFSI 137 18,955 60,836 — 79,928 Management fees — — — 8,449 8,449 Other 4,150 812 10,646 6,384 21,992 4,287 19,767 71,482 14,833 110,369 Pretax (loss) income $ 134,260 $ (64,602 ) $ 35,577 $ (14,207 ) $ 91,028 Total assets at quarter end $ 2,772,111 $ 4,739,849 $ 4,796,564 $ 213,730 $ 12,522,254 Credit Interest rate sensitive sensitive Correspondent Quarter ended March 31, 2020 strategies strategies production Corporate Total (in thousands) Net investment income: Net (loss) gain on loans acquired for sale $ (32,306 ) $ — $ 81,081 $ — $ 48,775 Net (loss) gain on investments (919,109 ) 103,978 — — (815,131 ) Net loan servicing fees — 244,572 — — 244,572 Net interest expense: Interest income 6,556 33,241 31,407 919 72,123 Interest expense 14,566 41,608 24,309 585 81,068 (8,010 ) (8,367 ) 7,098 334 (8,945 ) Other 166 — 23,988 58 24,212 (959,259 ) 340,183 112,167 392 (506,517 ) Expenses: Loan fulfillment and servicing fees payable to PFSI 301 14,220 41,940 — 56,461 Management fees — — — 9,055 9,055 Other 911 1,182 4,918 5,381 12,392 1,212 15,402 46,858 14,436 77,908 Pretax (loss) income $ (960,471 ) $ 324,781 $ 65,309 $ (14,044 ) $ (584,425 ) Total assets at quarter end $ 1,947,153 $ 5,664,991 $ 3,068,163 $ 1,238,181 $ 11,918,488

Supplemental Cash Flow Inform_2

Supplemental Cash Flow Information (Tables)	3 Months Ended
Supplemental Cash Flow Information (Tables)	Mar. 31, 2021
Supplemental Cash Flow Elements [Abstract]
Summary of Supplemental Cash Flow Information	Quarter ended March 31, 2021 2020 (in thousands) Payments: Income taxes, net $ 494 $ — Interest $ 91,611 $ 104,757 Non-cash investing activities: Transfer of loans and advances to real estate acquired in settlement of loans $ 280 $ 1,166 Receipt of mortgage servicing rights as proceeds from sales of loans at fair value $ 407,696 $ 248,822 Receipt of excess servicing spread pursuant to recapture agreement with PennyMac Financial Services, Inc. $ 557 $ 379 Non-cash financing activities: Dividends declared, not paid $ 46,109 $ 25,009

Regulatory Capital and Liquid_2

Regulatory Capital and Liquidity Requirements (Tables)	3 Months Ended
Regulatory Capital and Liquidity Requirements (Tables)	Mar. 31, 2021
Mortgage Banking [Abstract]
Summary of Capital and Liquidity Amounts and Requirements by Agencies	The Agencies’ capital and liquidity amounts and requirements, are summarized below: Net Worth (1) Tangible Net Worth / Total Assets Ratio (1) Liquidity (1) Fannie Mae and Freddie Mac Actual Required Actual Required Actual Required (dollars in thousands) March 31, 2021 $ 1,170,013 $ 473,294 14 % 6 % $ 155,419 $ 63,664 December 31, 2020 $ 1,101,318 $ 438,530 16 % 6 % $ 101,116 $ 59,158 (1) Calculated in accordance with the Agencies’ requirements.

Organization - Additional Infor

Organization - Additional Information (Detail)	3 Months Ended
Organization - Additional Information (Detail)	Mar. 31, 2021Segment
Accounting Policies [Abstract]
Number of business segments	4
Percentage of taxable income for distributions	90.00%

Basis of Presentation and Acc_2

Basis of Presentation and Accounting Change - Additional Information (Detail) - USD ($)	Mar. 31, 2021	Mar. 31, 2020	Nov. 04, 2019
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Restricted cash	$ 0	$ 0
Exchangeable Senior Notes due November 1, 2024 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Issuance of debt through private offering	$ 555,000,000		$ 210,000,000

Transactions with Related par_3

Transactions with Related parties - Correspondent Production Activities - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Jun. 30, 2020	Jun. 30, 2020
Maximum [Member]
Mortgage Loans On Real Estate [Line Items]
Interest income and sourcing fee	0.035%
Minimum [Member]
Mortgage Loans On Real Estate [Line Items]
Interest income and sourcing fee	0.02%
PennyMac Loan Services, LLC [Member]
Mortgage Loans On Real Estate [Line Items]
Servicing agreement expiration date	Jun. 30, 2025
Service agreement maturity renewal term	18 months
PennyMac Loan Services, LLC [Member] \| Fannie Mae Or Freddie Mac Mortgage Loans [Member] \| Maximum [Member]
Mortgage Loans On Real Estate [Line Items]
Basis point for monthly fulfillment fee			0.35%
PennyMac Loan Services, LLC [Member] \| Mortgage Loans Sold And Securitized \| Maximum [Member]
Mortgage Loans On Real Estate [Line Items]
Basis point for monthly fulfillment fee			0.50%
2020 MBS Agreement [Member]
Mortgage Loans On Real Estate [Line Items]
Services agreement effective date			Jul. 1, 2020
Servicing agreement expiration date	Jun. 30, 2025
Service agreement maturity renewal term	18 months
2020 MBS Agreement [Member] \| Maximum [Member]
Mortgage Loans On Real Estate [Line Items]
Interest income and sourcing fee		0.02%
Mortgage loans commintments multiplier		$ 585
Mortgage adjusted loan commitments		16,500
Number of mortgage loans purchased multiplier		315
Number of mortgage loans purchased		$ 16,500
2020 MBS Agreement [Member] \| Minimum [Member]
Mortgage Loans On Real Estate [Line Items]
Interest income and sourcing fee		0.01%
Mortgage loans commintments multiplier		$ 355
Mortgage adjusted loan commitments		16,500
Number of mortgage loans purchased multiplier		195
Number of mortgage loans purchased		16,500
2020 MBS Agreement [Member] \| Fannie Mae Or Freddie Mac Mortgage Loans [Member]
Mortgage Loans On Real Estate [Line Items]
Number of mortgage loans purchased multiplier		750
2020 MBS Agreement [Member] \| Ginnie Mae Mortgage Loans [Member]
Mortgage Loans On Real Estate [Line Items]
Mortgage loan servicing fees payable		$ 0	$ 0
Mortgage banking services [Member]
Mortgage Loans On Real Estate [Line Items]
Mortgage loan fees per annum	$ 1,500,000
Mortgage loan fees per loan	$ 35,000

Transactions with Related par_4

Transactions with Related parties - Summary of Correspondent Production Activity (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Related Party Transaction [Line Items]
Loans included in Loans acquired for sale at fair value pending sale to PLS	$ 4,646,761		$ 3,551,890
PennyMac Loan Services, LLC [Member]
Related Party Transaction [Line Items]
Loan fulfillment fees earned by PLS	60,835	$ 41,940
Sourcing fees received from PLS included in Net gain on loans acquired for sale	1,738	4,161
UPB of loans sold to PLS	17,559,575	13,870,280
Purchases of loans acquired for sale from PLS	0	2,246,127
Tax service fees paid to PLS	8,192	$ 3,980
Loans included in Loans acquired for sale at fair value pending sale to PLS	$ 327,881		$ 460,414

Transactions with Related par_5

Transactions with Related parties - Loan Servicing - Additional Information (Detail) - PennyMac Loan Services, LLC [Member]	3 Months Ended
	Mar. 31, 2021
Mortgage Loans On Real Estate [Line Items]
Servicing agreement expiration date	Jun. 30, 2025
Service agreement maturity renewal term	18 months

Transactions with Related par_6

Transactions with Related parties - Prime Servicing - Additional Information (Detail) - PennyMac Loan Services, LLC [Member]	3 Months Ended
	Mar. 31, 2021USD ($)
Subserviced loan [Member] \| Fixed-Rate Mortgage Loans [Member]
Mortgage Loans On Real Estate [Line Items]
Base servicing fees per month	$ 7.50
Subserviced loan [Member] \| Adjustable rate mortgage loans [Member]
Mortgage Loans On Real Estate [Line Items]
Base servicing fees per month	8.50
Non-Distressed Mortgage Loans [Member]
Mortgage Loans On Real Estate [Line Items]
Base servicing fees for REO per month	75
Non-Distressed Mortgage Loans [Member] \| Minimum [Member]
Mortgage Loans On Real Estate [Line Items]
Additional servicing fees per loan per month	10
Non-Distressed Mortgage Loans [Member] \| Maximum [Member]
Mortgage Loans On Real Estate [Line Items]
Additional servicing fees per loan per month	$ 55

Transactions with Related par_7

Transactions with Related parties - Special Servicing - Additional Information (Detail) - PennyMac Loan Services, LLC [Member]	3 Months Ended
	Mar. 31, 2021USD ($)
Mortgage Loans On Real Estate [Line Items]
REO rental fee	$ 30
Lease renewal fee for REO	$ 100
Rental income percentage gross	9.00%
Distressed loans [Member]
Mortgage Loans On Real Estate [Line Items]
Base servicing fees for REO per month	$ 75
Distressed loans [Member] \| Minimum [Member]
Mortgage Loans On Real Estate [Line Items]
Base servicing fees per month	30
Distressed loans [Member] \| Maximum [Member]
Mortgage Loans On Real Estate [Line Items]
Base servicing fees per month	$ 95

Transactions with Related par_8

Transactions with Related parties- MSR Recapture Agreement - Additional Information (Detail)	3 Months Ended	6 Months Ended
	Mar. 31, 2021	Jun. 30, 2020
MSR Recapture Agreement [Member]
Mortgage Loans On Real Estate [Line Items]
Percentage of cash in amount equal to fair market value of MSRs related to all loans		30.00%
2020 MSR Recapture Agreement [Member]
Mortgage Loans On Real Estate [Line Items]
Services agreement effective date	Jul. 1, 2020
Servicing agreement expiration date	Jun. 30, 2025
Service agreement maturity renewal term	18 months
Mortgage loans on real estate, renewed and Extended, description	Effective July 1, 2020, the 2020 MSR recapture agreement changed the recapture fee payable by PLS to a tiered amount equal to: • 40% of the fair market value of the MSRs relating to the recaptured loans subject to the first 15% of the “recapture rate”; • 35% of the fair market value of the MSRs relating to the recaptured loans subject to the recapture rate in excess of 15% and up to 30%; and • 30% of the fair market value of the MSRs relating to the recaptured loans subject to the recapture rate in excess of 30%.
Recapture rate	15.00%

Transactions with Related par_9

Transactions with Related parties - Summary of Loan Servicing Fees Earned and Mortgage Servicing Rights Recaptured Income Earned (Detail) - PennyMac Loan Services, LLC [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Related Party Transaction [Line Items]
Loan servicing fees	$ 19,093	$ 14,521
Average investment in loans Held in a VIE at fair value	177,161,626	136,687,324
Loans acquired for sale at fair value [Member]
Related Party Transaction [Line Items]
Loan servicing fees	543	536
Average investment in loans acquired for sale at fair value	3,618,980	3,215,418
Loans at fair value [Member]
Related Party Transaction [Line Items]
Loan servicing fees	137	300
Distressed [Member]
Related Party Transaction [Line Items]
Average investment in distressed loans at fair value	7,805	11,249
Mortgage servicing rights [Member]
Related Party Transaction [Line Items]
Loan servicing fees	18,413	13,685
Average investment in loans Held in a VIE at fair value	$ 129,122	$ 253,759

Transactions with Related pa_10

Transactions with Related parties - Management Fees - Additional Information (Detail) - USD ($)	3 Months Ended	6 Months Ended
	Mar. 31, 2021	Jun. 30, 2020	Jul. 01, 2020
Mortgage Loans On Real Estate [Line Items]
Termination fees, description	The termination fee is equal to three times the sum of (a) the average annual base management fee, and (b) the average annual performance incentive fee earned by PCM, in each case during the 24-month period before termination.
Fannie Mae [Member]
Mortgage Loans On Real Estate [Line Items]
MBS yield, average number of year	30 years
PNMAC Capital Management LLC [Member]
Mortgage Loans On Real Estate [Line Items]
Percentage of change in net income due to quarterly adjustments	8.00%
PMT agreed to reimburse PCM for a payment	$ 120,000		$ 165,000
Services agreement effective date		Jul. 1, 2020
Compensation expenses, description		Effective July 1, 2020, PMT’s reimbursement of PCM’s and its affiliates’ compensation expenses was increased from $120,000 to $165,000 per fiscal quarter, such amount to be reviewed annually and to not preclude reimbursement for any other services performed by PCM or its affiliates.
PNMAC Capital Management LLC [Member] \| 1.5% per annum of stockholders equity [Member]
Mortgage Loans On Real Estate [Line Items]
Base management fee annual rate	1.50%
PNMAC Capital Management LLC [Member] \| 1.375% per annum of stockholders equity [Member]
Mortgage Loans On Real Estate [Line Items]
Base management fee annual rate	1.375%
PNMAC Capital Management LLC [Member] \| 1.25% per annum of stockholders equity [Member]
Mortgage Loans On Real Estate [Line Items]
Base management fee annual rate	1.25%
PNMAC Capital Management LLC [Member] \| Net income exceeds 10% [Member]
Mortgage Loans On Real Estate [Line Items]
Percentage of net income for calculation of performance incentive fees	10.00%
Percentage of return on equity	12.00%
PNMAC Capital Management LLC [Member] \| Net income exceeds 15% [Member]
Mortgage Loans On Real Estate [Line Items]
Percentage of net income for calculation of performance incentive fees	15.00%
Percentage of return on equity	16.00%
PNMAC Capital Management LLC [Member] \| Net income exceeds 20% [Member]
Mortgage Loans On Real Estate [Line Items]
Percentage of net income for calculation of performance incentive fees	20.00%
PNMAC Capital Management LLC [Member] \| Maximum [Member]
Mortgage Loans On Real Estate [Line Items]
Percentage of performance incentive fee paid in Company's common shares	50.00%
PNMAC Capital Management LLC [Member] \| Maximum [Member] \| 1.5% per annum of stockholders equity [Member]
Mortgage Loans On Real Estate [Line Items]
Base management fee shareholders' equity limit	$ 2,000,000,000
PNMAC Capital Management LLC [Member] \| Maximum [Member] \| 1.375% per annum of stockholders equity [Member]
Mortgage Loans On Real Estate [Line Items]
Base management fee shareholders' equity limit	$ 5,000,000,000
PNMAC Capital Management LLC [Member] \| Maximum [Member] \| Net income exceeds 10% [Member]
Mortgage Loans On Real Estate [Line Items]
Percentage of return on equity	8.00%
PNMAC Capital Management LLC [Member] \| Maximum [Member] \| Net income exceeds 15% [Member]
Mortgage Loans On Real Estate [Line Items]
Percentage of return on equity	12.00%
PNMAC Capital Management LLC [Member] \| Maximum [Member] \| Net income exceeds 20% [Member]
Mortgage Loans On Real Estate [Line Items]
Percentage of return on equity	16.00%
PNMAC Capital Management LLC [Member] \| Minimum [Member] \| 1.375% per annum of stockholders equity [Member]
Mortgage Loans On Real Estate [Line Items]
Base management fee shareholders' equity limit	$ 2,000,000,000
PNMAC Capital Management LLC [Member] \| Minimum [Member] \| 1.25% per annum of stockholders equity [Member]
Mortgage Loans On Real Estate [Line Items]
Base management fee shareholders' equity limit	$ 5,000,000,000
PennyMac Financial Services, Inc. [Member]
Mortgage Loans On Real Estate [Line Items]
Performance incentive fee description	The performance incentive fee is equal to the sum of: (a) 10% of the amount by which “net income” for the quarter exceeds (i) an 8% return on “equity” plus the “high watermark”, up to (ii) a 12% return on “equity”; plus (b) 15% of the amount by which “net income” for the quarter exceeds (i) a 12% return on “equity” plus the high watermark, up to (ii) a 16% return on “equity”; plus (c) 20% of the amount by which “net income” for the quarter exceeds a 16% return on “equity” plus the “high watermark”.

Transactions with Related pa_11

Transactions with Related parties - Summary of Management Fee Expense (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Related Party Transaction [Line Items]
Total management fee incurred during the period	$ 8,449	$ 9,055
PNMAC Capital Management LLC [Member]
Related Party Transaction [Line Items]
Total management fee incurred during the period	8,449	9,055
Average shareholders' equity amounts used to calculate base management fee expense	2,310,261	2,466,740
PNMAC Capital Management LLC [Member] \| Base [Member]
Related Party Transaction [Line Items]
Total management fee incurred during the period	8,449	9,055
PNMAC Capital Management LLC [Member] \| Performance incentive [Member]
Related Party Transaction [Line Items]
Total management fee incurred during the period	$ 0	$ 0

Transactions with Related pa_12

Transactions with Related parties - Summary of Expenses (Detail) - PNMAC Capital Management LLC [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Related Party Transaction [Line Items]
Common overhead incurred by PCM and its affiliates	$ 571	$ 1,540
Compensation	165	120
Expenses incurred on the Company’s behalf, net	1,336	1,271
Total expenses incurred in transaction with affiliates	2,072	2,931
Payments and settlements during the quarter (1)	$ 112,741	$ 33,683

Transactions with Related pa_13

Transactions with Related parties - Note Payable to PLS - Additional Information (Detail) - USD ($)	Dec. 19, 2016	Mar. 31, 2021	Dec. 31, 2020
Related Party Transaction [Line Items]
Recapture percentage loan fee rate and unpaid principal balance refinance loans	90.00%
Recapture percentage loan fee rate and unpaid principal balance modified loans	90.00%
VFN [Member]
Related Party Transaction [Line Items]
Maximum principal balance	$ 1,000,000,000
PennyMac Financial Services, Inc. [Member]
Related Party Transaction [Line Items]
Number of common shares held by affiliate		75,000	75,000
Maximum [Member]
Related Party Transaction [Line Items]
Aggregate ESS transferred	$ 200,000

Transactions with Related pa_14

Transactions with Related parties - Summary of Investing Activity (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
ESS:
Interest income	$ 37,589	$ 72,123
Net gain (loss) included in Net gains (losses) on investments:
Net (loss) gain on investments	83,191	(815,131)
Excess servicing spread purchased from PennyMac Financial Services, Inc. at fair value	0		$ 131,750
PennyMac Financial Services, Inc. [Member]
ESS:
Received pursuant to a recapture agreement	557	379
Repayments	134,624	9,308
Interest income	1,280	1,974
Net gain (loss) included in Net gains (losses) on investments:
Valuation changes	1,037	(14,522)
Recapture income	614	381
Net (loss) gain on investments	$ 1,651	$ (14,141)

Transactions with Related pa_15

Transactions with Related parties - Summary of Financing Activities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Related Party Transaction [Line Items]
Interest expense	$ 76,308	$ 81,068
PennyMac Financial Services, Inc. [Member]
Related Party Transaction [Line Items]
Net repayments of assets sold under agreements to repurchase	80,862	7,746
Interest expense	387	$ 1,218
Assets sold to PFSI under agreement to repurchase	$ 0		$ 80,862

Transactions with Related pa_16

Transactions with Related parties - Summary of Amounts Receivable From and Payable to PFSI (Detail) - PennyMac Financial Services, Inc. [Member] - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Due from PFSI:
MSR recapture	$ 0	$ 296
Other	7,521	7,856
Due from Affiliates	7,521	8,152
Due to PFSI:
Allocated expenses and expenses and costs paid by PFSI on PMT’s behalf	23,325	38,142
Fulfillment fees	17,347	20,873
Correspondent production fees	12,937	13,065
Management fees	8,449	8,686
Loan servicing fees	6,586	6,213
Interest on Assets sold to PFSI under agreement to repurchase	0	26
Total expense due to affiliate	$ 68,644	$ 87,005

Transactions with Related pa_17

Transactions with Related parties - Summary of Transfer Cash to Fund Loan Servicing Advances (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Related Party Transaction [Line Items]
Loan servicing advances	$ 150,160	$ 121,820
Real estate acquired in settlement of loans	17,715	28,709
PennyMac Loan Services, LLC [Member]
Related Party Transaction [Line Items]
Loan servicing advances	150,160	121,820
Real estate acquired in settlement of loans	6,788	10,334
Servicing advances and real estate acquired	$ 156,948	$ 132,154

Loan Sales - Summary of Cash Fl

Loan Sales - Summary of Cash Flows between Company and Transferees in Transfers Accounted for Sales (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows:
Loan servicing fees received net of guarantee fees	$ 116,287	$ 94,469
Variable Interest Entity, Not Primary Beneficiary [Member]
Cash flows:
Proceeds from sales	33,318,157	19,718,151
Loan servicing fees received net of guarantee fees	$ 116,287	$ 94,469

Loan Sales - Summary of Collect

Loan Sales - Summary of Collection Status Information for Loans Accounted for Sales (Detail) - Variable Interest Entity, Not Primary Beneficiary [Member] - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020
Mortgage Loans On Real Estate [Line Items]
UPB of loans outstanding		$ 183,271,774	$ 170,502,361
Collection Status (UPB)
30-89 days delinquent		920,655	1,235,981
90 or more days delinquent:
Not in foreclosure		3,788,000	4,428,915
In foreclosure		24,647	27,494
Bankruptcy		154,197	148,866
Custodial funds managed by the Company	[1]	6,571,084	6,086,724
COVID-19 [Member]
90 or more days delinquent:
30-89 days		511,015	530,353
90 days or more		$ 3,364,821	$ 3,123,288

[1]	Custodial funds include borrower and investor custodial cash accounts relating to loans serviced under mortgage servicing agreements and are not included on the Company’s consolidated balance sheets. The Company earns placement fees on certain of the custodial funds it manages on behalf of the loans’ borrowers and investors, which are included in

Variable Interest Entities - Ad

Variable Interest Entities - Additional Information (Detail) - USD ($) $ in Millions	Sep. 30, 2013	Mar. 31, 2021
Variable Interest Entity, Primary Beneficiary [Member] \| Jumbo Mortgage Loan Financing [Member]
Mortgage Loans on Real Estate [Line Items]
Certificates issued	$ 537
Weighted yield	3.90%
Credit Risk Transfer Agreements [Member] \| Minimum [Member]
Mortgage Loans on Real Estate [Line Items]
Initially established percentage of unpaid principal balance of loans sold under recourse obligation losses		3.50%
Increase to maximum percentage of outstanding unpaid principal balance		4.50%
Credit Risk Transfer Agreements [Member] \| Maximum [Member]
Mortgage Loans on Real Estate [Line Items]
Initially established percentage of unpaid principal balance of loans sold under recourse obligation losses		4.00%
Increase to maximum percentage of outstanding unpaid principal balance		5.00%

Variable Interest Entities - Su

Variable Interest Entities - Summary of Credit Risk Transfer Agreements (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2027	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022	Mar. 03, 2021	Dec. 31, 2020
CRT strips
Net investment income (loss)		$ 201,397	$ (506,517)
Carrying value of CRT arrangements:
Derivative and credit risk transfer strip assets		182,969									$ 164,318
Interest-only security payable at fair value		18,922		$ 18,922	$ 0	$ 0	$ 0	$ 0	$ 0	$ 18,922	10,757
Variable Interest Entity, Primary Beneficiary [Member]
Carrying value of CRT arrangements:
Derivative and credit risk transfer strip assets		58,134									58,699
Interest-only security payable at fair value		18,922									10,757
Variable Interest Entity, Primary Beneficiary [Member] \| Credit Risk Transfer Agreements [Member]
Transfer Of Financial Assets Accounted For As Sales [Line Items]
UPB of loans sold			14,683,055
Investments — Change in expected face amount of firm commitment to purchase CRT securities			554,690
Net investment income (loss)
Net gains on loans acquired for sale — Fair value of firm commitment to purchase CRT securities recognized upon sale of loans			(26,649)
CRT derivatives
Realized		23,496	17,201
Valuation changes		12,874	(300,943)
Gains (losses) recognized on gross derivative related to credit risk transactions		36,370	(283,742)
CRT strips
Realized		32,604	14,750
Valuation changes		93,222	(229,875)
Credit risk transfer strips		125,826	(215,125)
Interest-only security payable at fair value		(8,165)	11,575
Gains (losses) recognized on gross derivative related to credit risk transactions		154,031	(487,292)
Firm commitments to purchase CRT securities			(492,513)
Gains (losses) recognized on CRT agreements upon firm commitments to purchase CRT securities		154,031	(979,805)
Interest income — Deposits securing CRT arrangements		168	6,099
Net investment income (loss)		154,199	(1,000,355)
Net (recoveries received) payments made to settle (recoveries) losses on CRT arrangements		$ (13,343)	1,517
Carrying value of CRT arrangements:
CRT derivatives			44,676								31,795
CRT strips			(109,570)								(202,792)
Derivative and credit risk transfer strip assets			(64,894)								(170,997)
Deposits securing CRT arrangements			2,664,420								2,799,263
Interest-only security payable at fair value			18,922								10,757
Derivative and credit risk transfer assets			58,134								58,699
Derivative and credit risk transfer strip assets pledged to secure	[1]		2,664,420								2,799,263
UPB of loans — funded CRT arrangements			48,403,684								58,697,942
Variable Interest Entity, Primary Beneficiary [Member] \| Credit Risk Transfer Agreements [Member] \| Purchase Commitment [Member]
Collection status (UPB):
Current			45,422,502								54,990,381
30-89 days delinquent			489,284								710,872
90-180 days delinquent			472,038								693,315
180 or more days delinquent			2,014,310								2,297,365
Foreclosure			5,550								6,009
Bankruptcy			77,362								75,700
Variable Interest Entity, Primary Beneficiary [Member] \| Credit Risk Transfer Agreements [Member] \| Purchase Commitment [Member] \| COVID-19 [Member]
Collection status (UPB):
30-89 days			245,592								383,028
90-180 days delinquent			353,422								546,344
180 or more days delinquent			$ 1,614,170								$ 1,944,663

[1]	Deposits securing credit risk transfer strip liabilities also secure $123.0 million and $229.7 million in CRT strip and CRT derivative liabilities at March 31, 2021 and December 31, 2020, respectively

Variable Interest Entities - _2

Variable Interest Entities - Summary of Credit Risk Transfer Agreements (Parenthetical) (Detail) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Transfer Of Financial Assets Accounted For As Sales [Line Items]
Deposits securing CRT strips and derivatives liabilities	$ 123	$ 229.7

Variable Interest Entities - _3

Variable Interest Entities - Summary of Jumbo Mortgage Loan Financing (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2027	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022	Mar. 03, 2021	Dec. 31, 2020
Mortgage Loans on Real Estate [Line Items]
Interest income	$ 37,589	$ 72,123
Interest expense	76,308	81,068
Loans at fair value	117,647									$ 151,734
Asset-backed financing of a variable interest entity at fair value	101,238		$ 100,036	$ 0	$ 0	$ 0	$ 0	$ 0	$ 100,036	134,726
Variable Interest Entity, Primary Beneficiary [Member]
Mortgage Loans on Real Estate [Line Items]
Loans at fair value	109,845									143,707
Asset-backed financing of a variable interest entity at fair value	101,238									134,726
Jumbo Mortgage Loan Financing [Member] \| Variable Interest Entity, Primary Beneficiary [Member]
Mortgage Loans on Real Estate [Line Items]
Interest income	1,899	2,641
Interest expense	168	$ 4,527
Loans at fair value	109,845									143,707
Asset-backed financing of a variable interest entity at fair value	101,238									134,726
Certificates retained at fair value	$ 8,607									$ 8,981

Fair Value - Summary of Financi

Fair Value - Summary of Financial Statement Items Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands		Mar. 31, 2027	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021	Mar. 03, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Assets:
Short-term investments								$ 108,375		$ 127,295
Mortgage-backed securities at fair value pledged to creditors								1,916,485		2,213,922
Loans acquired for sale at fair value								4,646,761		3,551,890
Derivative assets								354,694		223,648
Derivative assets, Netting								(171,725)		(59,330)
Total derivative and credit risk transfer strip assets after netting								182,969		164,318
Mortgage servicing rights at fair value ($2,423,063 and $1,742,905 pledged to creditors, respectively)								2,441,214		1,755,236	$ 1,157,326	$ 1,535,705
Excess servicing spread purchased from PFSI								0		131,750
Liabilities:
Asset-backed financing of a variable interest entity at fair value		$ 100,036	$ 0	$ 0	$ 0	$ 0	$ 0	101,238	$ 100,036	134,726
Interest-only security payable at fair value		18,922	0	0	0	0	0	18,922	18,922	10,757
Asset-backed financing of a VIE at fair value		$ 100,036	$ 0	$ 0	$ 0	$ 0	$ 0	101,238	$ 100,036	134,726
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								197,866		150,213
Total derivative and credit risk transfer strips liabilities								229,970		263,473
Derivative liabilities, Netting								(77,466)		(89,532)
Total derivative liabilities after netting								120,400		60,681
Total derivative and credit risk transfer strips liabilities								229,970		263,473
Derivative assets								354,694		223,648
Derivative liabilities								197,866		150,213
Swaption Purchase Contracts
Assets:
Derivative assets	[1]							29,034		8,505
Derivative and credit risk transfer strip liabilities:
Derivative assets	[1]							29,034		8,505
CRT Derivatives [Member]
Assets:
Derivative assets								58,134		58,699
Derivative assets, Netting								0		0
Total derivative and credit risk transfer strip assets after netting								58,134		58,699
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								13,458		26,904
Derivative assets								58,134		58,699
Derivative liabilities								13,458		26,904
Interest Rate Lock Commitments [Member]
Assets:
Derivative assets								7,552		72,794
Total derivative and credit risk transfer strip assets after netting								7,552		72,794
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								72,410		408
Derivative assets								7,552		72,794
Derivative liabilities								72,410		408
Forward Purchase Contracts [Member]
Assets:
Derivative assets	[1]							6,687		72,526
Derivative assets, Netting								0		0
Total derivative and credit risk transfer strip assets after netting								6,687		72,526
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								89,312		17
Derivative liabilities, Netting								0		0
Derivative assets	[1]							6,687		72,526
Derivative liabilities								89,312		17
Forward Sales Contracts [Member]
Assets:
Derivative assets	[1]							182,192		92
Derivative assets, Netting								0		0
Total derivative and credit risk transfer strip assets after netting								182,192		92
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								6,965		122,884
Derivative liabilities, Netting								0		0
Derivative assets	[1]							182,192		92
Derivative liabilities								6,965		122,884
Call Options on Interest Rate Futures Purchase Contracts [Member]
Assets:
Derivative assets	[1]							992		3,070
Derivative assets, Netting								0		0
Total derivative and credit risk transfer strip assets after netting								992		3,070
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								0		0
Derivative assets	[1]							992		3,070
Derivative liabilities								0		0
Put Options On Interest Rate Futures Purchase Contracts
Assets:
Derivative assets	[1]							18,938		4,742
Derivative assets, Netting								0		0
Total derivative and credit risk transfer strip assets after netting								18,938		4,742
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								0		0
Derivative assets	[1]							18,938		4,742
Derivative liabilities								0		0
MBS Put Options [Member]
Assets:
Derivative assets	[1]							51,165		3,220
Derivative assets, Netting								0		0
Total derivative and credit risk transfer strip assets after netting								51,165		3,220
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								9,657		0
Derivative liabilities, Netting								0		0
Derivative assets	[1]							51,165		3,220
Derivative liabilities								9,657		0
Put Options On Interest Rate Futures Sale Contracts
Assets:
Derivative assets	[1]							0		0
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								6,064		0
Derivative liabilities, Netting								0		0
Derivative assets	[1]							0		0
Derivative liabilities								6,064		0
Recurring [Member]
Assets:
Short-term investments								108,375		127,295
Mortgage-backed securities at fair value pledged to creditors								1,916,485		2,213,922
Loans acquired for sale at fair value								4,646,761		3,551,890
Loans at fair value								117,647		151,734
Derivative assets								354,694		223,648
Derivative assets, Netting								(171,725)		(59,330)
Total derivative and credit risk transfer strip assets after netting								182,969		164,318
Mortgage servicing rights at fair value ($2,423,063 and $1,742,905 pledged to creditors, respectively)								2,441,214		1,755,236
Total Assets								9,413,451		8,096,145
Excess servicing spread purchased from PFSI										131,750
Liabilities:
Asset-backed financing of a variable interest entity at fair value								101,238		134,726
Interest-only security payable at fair value								18,922		10,757
Asset-backed financing of a VIE at fair value								101,238		134,726
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								197,866		150,213
Total derivative and credit risk transfer strips liabilities								229,970		263,473
Derivative liabilities, Netting								(77,466)		(89,532)
Total derivative liabilities after netting								120,400		60,681
Total derivative and credit risk transfer strips liabilities								229,970		263,473
Derivative assets								354,694		223,648
Total liabilities								350,130		408,956
Derivative liabilities								197,866		150,213
Total liabilities								350,130		408,956
Recurring [Member] \| Credit Risk Transfer Strips [Member]
Assets:
Derivative assets										202,792
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								109,570		26,904
Derivative assets										202,792
Derivative liabilities								109,570		26,904
Recurring [Member] \| Swaption Purchase Contracts
Assets:
Derivative assets								29,034		8,505
Derivative and credit risk transfer strip liabilities:
Derivative assets								29,034		8,505
Recurring [Member] \| CRT Derivatives [Member]
Assets:
Derivative assets								58,134		58,699
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								13,458
Derivative assets								58,134		58,699
Derivative liabilities								13,458
Recurring [Member] \| Level 1 [Member]
Assets:
Short-term investments								108,375		127,295
Mortgage-backed securities at fair value pledged to creditors								0		0
Loans acquired for sale at fair value								0		0
Loans at fair value								0		0
Derivative assets								19,930		7,812
Derivative assets, Netting								0		0
Total derivative and credit risk transfer strip assets after netting								19,930		7,812
Mortgage servicing rights at fair value ($2,423,063 and $1,742,905 pledged to creditors, respectively)								0		0
Total Assets								128,305		135,107
Excess servicing spread purchased from PFSI										0
Liabilities:
Asset-backed financing of a variable interest entity at fair value								0		0
Interest-only security payable at fair value								0		0
Asset-backed financing of a VIE at fair value								0		0
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								0		0
Total derivative and credit risk transfer strips liabilities								0		0
Derivative liabilities, Netting								0		0
Total derivative liabilities after netting								0		0
Total derivative and credit risk transfer strips liabilities								0		0
Derivative assets								19,930		7,812
Total liabilities								0		0
Derivative liabilities								0		0
Total liabilities								0		0
Recurring [Member] \| Level 1 [Member] \| Credit Risk Transfer Strips [Member]
Assets:
Derivative assets										0
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								0		0
Derivative assets										0
Derivative liabilities								0		0
Recurring [Member] \| Level 1 [Member] \| Swaption Purchase Contracts
Assets:
Derivative assets								0		0
Derivative and credit risk transfer strip liabilities:
Derivative assets								0		0
Recurring [Member] \| Level 1 [Member] \| CRT Derivatives [Member]
Assets:
Derivative assets								0		0
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								0
Derivative assets								0		0
Derivative liabilities								0
Recurring [Member] \| Level 2 [Member]
Assets:
Short-term investments								0		0
Mortgage-backed securities at fair value pledged to creditors								1,916,485		2,213,922
Loans acquired for sale at fair value								4,612,527		3,518,015
Loans at fair value								109,845		143,707
Derivative assets								269,078		84,343
Derivative assets, Netting								0		0
Total derivative and credit risk transfer strip assets after netting								269,078		84,343
Mortgage servicing rights at fair value ($2,423,063 and $1,742,905 pledged to creditors, respectively)								0		0
Total Assets								6,907,935		5,959,987
Excess servicing spread purchased from PFSI										0
Liabilities:
Asset-backed financing of a variable interest entity at fair value								101,238		134,726
Interest-only security payable at fair value								0		0
Asset-backed financing of a VIE at fair value								101,238		134,726
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								111,998		122,901
Total derivative and credit risk transfer strips liabilities								111,998		122,901
Derivative liabilities, Netting								0		0
Total derivative liabilities after netting								111,998		122,901
Total derivative and credit risk transfer strips liabilities								111,998		122,901
Derivative assets								269,078		84,343
Total liabilities								213,236		257,627
Derivative liabilities								111,998		122,901
Total liabilities								213,236		257,627
Recurring [Member] \| Level 2 [Member] \| Credit Risk Transfer Strips [Member]
Assets:
Derivative assets										0
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								0		0
Derivative assets										0
Derivative liabilities								0		0
Recurring [Member] \| Level 2 [Member] \| Swaption Purchase Contracts
Assets:
Derivative assets								29,034		8,505
Derivative and credit risk transfer strip liabilities:
Derivative assets								29,034		8,505
Recurring [Member] \| Level 2 [Member] \| CRT Derivatives [Member]
Assets:
Derivative assets								0		0
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								0
Derivative assets								0		0
Derivative liabilities								0
Recurring [Member] \| Level 3 [Member]
Assets:
Short-term investments								0		0
Mortgage-backed securities at fair value pledged to creditors								0		0
Loans acquired for sale at fair value								34,234		33,875
Loans at fair value								7,802		8,027
Derivative assets								65,686		131,493
Derivative assets, Netting								0		0
Total derivative and credit risk transfer strip assets after netting								65,686		131,493
Mortgage servicing rights at fair value ($2,423,063 and $1,742,905 pledged to creditors, respectively)								2,441,214		1,755,236
Total Assets								2,548,936		2,060,381
Excess servicing spread purchased from PFSI										131,750
Liabilities:
Asset-backed financing of a variable interest entity at fair value								0		0
Interest-only security payable at fair value								18,922		10,757
Asset-backed financing of a VIE at fair value								0		0
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								85,868		27,312
Total derivative and credit risk transfer strips liabilities								195,438		230,104
Derivative liabilities, Netting								0		0
Total derivative liabilities after netting								85,868		27,312
Total derivative and credit risk transfer strips liabilities								195,438		230,104
Derivative assets								65,686		131,493
Total liabilities								214,360		240,861
Derivative liabilities								85,868		27,312
Total liabilities								214,360		240,861
Recurring [Member] \| Level 3 [Member] \| Credit Risk Transfer Strips [Member]
Assets:
Derivative assets										202,792
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								109,570		26,904
Derivative assets										202,792
Derivative liabilities								109,570		26,904
Recurring [Member] \| Level 3 [Member] \| Swaption Purchase Contracts
Assets:
Derivative assets								0		0
Derivative and credit risk transfer strip liabilities:
Derivative assets								0		0
Recurring [Member] \| Level 3 [Member] \| CRT Derivatives [Member]
Assets:
Derivative assets								58,134		58,699
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								13,458
Derivative assets								58,134		58,699
Derivative liabilities								13,458
Recurring [Member] \| Interest Rate Lock Commitments [Member]
Assets:
Derivative assets								7,552		72,794
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								72,410		408
Derivative assets								7,552		72,794
Derivative liabilities								72,410		408
Recurring [Member] \| Interest Rate Lock Commitments [Member] \| Level 1 [Member]
Assets:
Derivative assets								0		0
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								0		0
Derivative assets								0		0
Derivative liabilities								0		0
Recurring [Member] \| Interest Rate Lock Commitments [Member] \| Level 2 [Member]
Assets:
Derivative assets								0		0
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								0		0
Derivative assets								0		0
Derivative liabilities								0		0
Recurring [Member] \| Interest Rate Lock Commitments [Member] \| Level 3 [Member]
Assets:
Derivative assets								7,552		72,794
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								72,410		408
Derivative assets								7,552		72,794
Derivative liabilities								72,410		408
Recurring [Member] \| Forward Purchase Contracts [Member]
Assets:
Derivative assets								6,687		72,526
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								89,312		17
Derivative assets								6,687		72,526
Derivative liabilities								89,312		17
Recurring [Member] \| Forward Purchase Contracts [Member] \| Level 1 [Member]
Assets:
Derivative assets								0		0
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								0		0
Derivative assets								0		0
Derivative liabilities								0		0
Recurring [Member] \| Forward Purchase Contracts [Member] \| Level 2 [Member]
Assets:
Derivative assets								6,687		72,526
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								89,312		17
Derivative assets								6,687		72,526
Derivative liabilities								89,312		17
Recurring [Member] \| Forward Purchase Contracts [Member] \| Level 3 [Member]
Assets:
Derivative assets								0		0
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								0		0
Derivative assets								0		0
Derivative liabilities								0		0
Recurring [Member] \| Forward Sales Contracts [Member]
Assets:
Derivative assets								182,192		92
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								6,965		122,884
Derivative assets								182,192		92
Derivative liabilities								6,965		122,884
Recurring [Member] \| Forward Sales Contracts [Member] \| Level 1 [Member]
Assets:
Derivative assets								0		0
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								0		0
Derivative assets								0		0
Derivative liabilities								0		0
Recurring [Member] \| Forward Sales Contracts [Member] \| Level 2 [Member]
Assets:
Derivative assets								182,192		92
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								6,965		122,884
Derivative assets								182,192		92
Derivative liabilities								6,965		122,884
Recurring [Member] \| Forward Sales Contracts [Member] \| Level 3 [Member]
Assets:
Derivative assets								0		0
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								0		0
Derivative assets								0		0
Derivative liabilities								0		0
Recurring [Member] \| Call Options on Interest Rate Futures Purchase Contracts [Member]
Assets:
Derivative assets								992
Derivative and credit risk transfer strip liabilities:
Derivative assets								992
Recurring [Member] \| Call Options on Interest Rate Futures Purchase Contracts [Member] \| Level 1 [Member]
Assets:
Derivative assets								992
Derivative and credit risk transfer strip liabilities:
Derivative assets								992
Recurring [Member] \| Call Options on Interest Rate Futures Purchase Contracts [Member] \| Level 2 [Member]
Assets:
Derivative assets								0
Derivative and credit risk transfer strip liabilities:
Derivative assets								0
Recurring [Member] \| Call Options on Interest Rate Futures Purchase Contracts [Member] \| Level 3 [Member]
Assets:
Derivative assets								0
Derivative and credit risk transfer strip liabilities:
Derivative assets								0
Recurring [Member] \| Put Options On Interest Rate Futures Purchase Contracts
Assets:
Derivative assets								18,938
Derivative and credit risk transfer strip liabilities:
Derivative assets								18,938
Recurring [Member] \| Put Options On Interest Rate Futures Purchase Contracts \| Level 1 [Member]
Assets:
Derivative assets								18,938
Derivative and credit risk transfer strip liabilities:
Derivative assets								18,938
Recurring [Member] \| Put Options On Interest Rate Futures Purchase Contracts \| Level 2 [Member]
Assets:
Derivative assets								0
Derivative and credit risk transfer strip liabilities:
Derivative assets								0
Recurring [Member] \| Put Options On Interest Rate Futures Purchase Contracts \| Level 3 [Member]
Assets:
Derivative assets								0
Derivative and credit risk transfer strip liabilities:
Derivative assets								0
Recurring [Member] \| MBS Put Options [Member]
Assets:
Derivative assets								51,165		3,220
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								9,657
Derivative assets								51,165		3,220
Derivative liabilities								9,657
Recurring [Member] \| MBS Put Options [Member] \| Level 1 [Member]
Assets:
Derivative assets								0		0
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								0
Derivative assets								0		0
Derivative liabilities								0
Recurring [Member] \| MBS Put Options [Member] \| Level 2 [Member]
Assets:
Derivative assets								51,165		3,220
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								9,657
Derivative assets								51,165		3,220
Derivative liabilities								9,657
Recurring [Member] \| MBS Put Options [Member] \| Level 3 [Member]
Assets:
Derivative assets								0		0
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								0
Derivative assets								0		0
Derivative liabilities								0
Recurring [Member] \| Put Options On Interest Rate Futures Sale Contracts
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								6,064
Derivative liabilities								6,064
Recurring [Member] \| Put Options On Interest Rate Futures Sale Contracts \| Level 1 [Member]
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								0
Derivative liabilities								0
Recurring [Member] \| Put Options On Interest Rate Futures Sale Contracts \| Level 2 [Member]
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								6,064
Derivative liabilities								6,064
Recurring [Member] \| Put Options On Interest Rate Futures Sale Contracts \| Level 3 [Member]
Derivative and credit risk transfer strip liabilities:
Derivative liabilities								0
Derivative liabilities								$ 0
Recurring [Member] \| Put Options on Interest Rate Futures [Member]
Assets:
Derivative assets										4,742
Derivative and credit risk transfer strip liabilities:
Derivative assets										4,742
Recurring [Member] \| Put Options on Interest Rate Futures [Member] \| Level 1 [Member]
Assets:
Derivative assets										4,742
Derivative and credit risk transfer strip liabilities:
Derivative assets										4,742
Recurring [Member] \| Put Options on Interest Rate Futures [Member] \| Level 2 [Member]
Assets:
Derivative assets										0
Derivative and credit risk transfer strip liabilities:
Derivative assets										0
Recurring [Member] \| Put Options on Interest Rate Futures [Member] \| Level 3 [Member]
Assets:
Derivative assets										0
Derivative and credit risk transfer strip liabilities:
Derivative assets										0
Recurring [Member] \| Call Options on Interest Rate Futures [Member]
Assets:
Derivative assets										3,070
Derivative and credit risk transfer strip liabilities:
Derivative assets										3,070
Recurring [Member] \| Call Options on Interest Rate Futures [Member] \| Level 1 [Member]
Assets:
Derivative assets										3,070
Derivative and credit risk transfer strip liabilities:
Derivative assets										3,070
Recurring [Member] \| Call Options on Interest Rate Futures [Member] \| Level 2 [Member]
Assets:
Derivative assets										0
Derivative and credit risk transfer strip liabilities:
Derivative assets										0
Recurring [Member] \| Call Options on Interest Rate Futures [Member] \| Level 3 [Member]
Assets:
Derivative assets										0
Derivative and credit risk transfer strip liabilities:
Derivative assets										$ 0

[1]	All hedging derivatives are interest rate derivatives that are used as economic hedges.

Fair Value - Summary of Changes

Fair Value - Summary of Changes in Items Measured Using Level 3 Inputs on Recurring Basis (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Assets:
Amounts (incurred) received pursuantto sales of loans	$ 407,696	$ 248,822
Transfers:
Loans to REO	(280)	(1,166)
Interest Rate Lock Commitments [Member]
Assets:
Beginning balance	72,386
Transfers:
Ending balance	(64,858)
Recurring [Member]
Assets:
Beginning balance		2,044,019
Purchases and issuances	6,194	102,268
Repayments and sales	(207,371)	(54,004)
Capitalization of interest and fees	1,478	1,974
ESS received pursuant to a recapture agreement with PFSI	557	379
Amounts (incurred) received pursuantto sales of loans	407,696	222,173
Changes in instrument-specific credit risk	0	0
Other factors	166,626	(1,530,360)
Total	166,626	(1,530,360)
Transfers:
Loans from REO	66
Interest rate lock commitments to loans acquired for sale	147,975	(125,334)
Ending balance	2,353,498	660,230
Changes in fair value recognized during the quarter relating to assets still held at March 31, 2021	319,938	(1,586,352)
Loans to REO		(885)
Recurring [Member] \| Repurchase Agreement Derivatives [Member]
Assets:
Beginning balance		5,275
Purchases and issuances		0
Repayments and sales		0
Capitalization of interest and fees		0
ESS received pursuant to a recapture agreement with PFSI		0
Amounts (incurred) received pursuantto sales of loans		0
Changes in instrument-specific credit risk		0
Other factors		0
Total		0
Transfers:
Interest rate lock commitments to loans acquired for sale		0
Ending balance		5,275
Changes in fair value recognized during the quarter relating to assets still held at March 31, 2021		0
Loans to REO		0
Recurring [Member] \| Previously Reported
Assets:
Beginning balance	1,830,277
Recurring [Member] \| CRT Derivatives [Member]
Assets:
Beginning balance	31,795	115,863
Purchases and issuances	0	0
Repayments and sales	(23,489)	(18,054)
Capitalization of interest and fees	0	0
ESS received pursuant to a recapture agreement with PFSI	0	0
Amounts (incurred) received pursuantto sales of loans	0	0
Changes in instrument-specific credit risk	0	0
Other factors	36,370	(283,742)
Total	36,370	(283,742)
Transfers:
Loans from REO	0
Interest rate lock commitments to loans acquired for sale	0	0
Ending balance	44,676	(185,933)
Changes in fair value recognized during the quarter relating to assets still held at March 31, 2021	12,874	(300,944)
Loans to REO		0
Recurring [Member] \| Credit Risk Transfer Strips [Member]
Assets:
Beginning balance	(202,792)	54,930
Purchases and issuances	0	0
Repayments and sales	(32,604)	(14,750)
Capitalization of interest and fees	0	0
ESS received pursuant to a recapture agreement with PFSI	0	0
Amounts (incurred) received pursuantto sales of loans	0	0
Changes in instrument-specific credit risk	0	0
Other factors	125,826	(215,125)
Total	125,826	(215,125)
Transfers:
Loans from REO	0
Interest rate lock commitments to loans acquired for sale	0	0
Ending balance	(109,570)	(174,945)
Changes in fair value recognized during the quarter relating to assets still held at March 31, 2021	93,222	(229,875)
Loans to REO		0
Recurring [Member] \| Loans acquired for sale [Member]
Assets:
Beginning balance	33,875	18,567
Purchases and issuances	15,898	11,291
Repayments and sales	(16,070)	(7,557)
Capitalization of interest and fees	0	0
ESS received pursuant to a recapture agreement with PFSI	0	0
Amounts (incurred) received pursuantto sales of loans	0	0
Changes in instrument-specific credit risk	0	0
Other factors	531	240
Total	531	240
Transfers:
Loans from REO	0
Interest rate lock commitments to loans acquired for sale	0	0
Ending balance	34,234	22,541
Changes in fair value recognized during the quarter relating to assets still held at March 31, 2021	337	160
Loans to REO		0
Recurring [Member] \| Interest Rate Lock Commitments [Member]
Assets:
Beginning balance	72,386	11,154
Purchases and issuances	(9,704)	89,919
Repayments and sales	0	0
Capitalization of interest and fees	0	0
ESS received pursuant to a recapture agreement with PFSI	0	0
Amounts (incurred) received pursuantto sales of loans	0	0
Changes in instrument-specific credit risk	0	0
Other factors	(275,515)	103,645
Total	(275,515)	103,645
Transfers:
Loans from REO	0
Interest rate lock commitments to loans acquired for sale	147,975	(125,334)
Ending balance	(64,858)	79,384
Changes in fair value recognized during the quarter relating to assets still held at March 31, 2021	(64,858)	79,384
Loans to REO		0
Recurring [Member] \| Interest-only security payable [Member]
Assets:
Changes in instrument-specific credit risk\Other factors	8,165	(11,575)
Ending balance	18,922	14,134
Changes in fair value recognized during the quarter relating to liability outstanding at March 31, 2021	8,165	(11,575)
Liabilities:
Beginning balance	10,757	25,709
Changes in fair value included in income arising from:
Changes in instrument-specific credit risk\Other factors	8,165	(11,575)
Ending balance	18,922	14,134
Changes in fair value recognized during the quarter relating to liability outstanding at March 31, 2021	8,165	(11,575)
Recurring [Member] \| Interest-only security payable [Member] \| Credit Risk [Member]
Assets:
Changes in instrument-specific credit risk\Other factors	0	0
Changes in fair value included in income arising from:
Changes in instrument-specific credit risk\Other factors	0	0
Recurring [Member] \| Interest-only security payable [Member] \| Other Factors [Member]
Assets:
Changes in instrument-specific credit risk\Other factors	8,165	(11,575)
Changes in fair value included in income arising from:
Changes in instrument-specific credit risk\Other factors	8,165	(11,575)
Recurring [Member] \| Excess servicing spread [Member]
Assets:
Beginning balance	8,027	14,426
Purchases and issuances	0	1,058
Repayments and sales	(584)	(4,335)
Capitalization of interest and fees	198	0
ESS received pursuant to a recapture agreement with PFSI	0	0
Amounts (incurred) received pursuantto sales of loans	0	0
Changes in instrument-specific credit risk	0	0
Other factors	95	(1,142)
Total	95	(1,142)
Transfers:
Loans from REO	66
Interest rate lock commitments to loans acquired for sale	0	0
Ending balance	7,802	9,122
Changes in fair value recognized during the quarter relating to assets still held at March 31, 2021	81	(841)
Loans to REO		(885)
Recurring [Member] \| Excess servicing spread [Member]
Assets:
Beginning balance	131,750	178,586
Purchases and issuances	0	0
Repayments and sales	(134,624)	(9,308)
Capitalization of interest and fees	1,280	1,974
ESS received pursuant to a recapture agreement with PFSI	557	379
Amounts (incurred) received pursuantto sales of loans	0	0
Changes in instrument-specific credit risk	0	0
Other factors	1,037	(14,522)
Total	1,037	(14,522)
Transfers:
Loans from REO	0
Interest rate lock commitments to loans acquired for sale	0	0
Ending balance	0	157,109
Changes in fair value recognized during the quarter relating to assets still held at March 31, 2021	0	(14,522)
Loans to REO		0
Recurring [Member] \| Mortgage servicing rights [Member]
Assets:
Beginning balance		1,535,705
Purchases and issuances	0	0
Repayments and sales	0	0
Capitalization of interest and fees	0	0
ESS received pursuant to a recapture agreement with PFSI	0	0
Amounts (incurred) received pursuantto sales of loans	407,696	248,822
Changes in instrument-specific credit risk	0	0
Other factors	278,282	(627,201)
Total	278,282	(627,201)
Transfers:
Loans from REO	0
Interest rate lock commitments to loans acquired for sale	0	0
Ending balance	2,441,214	1,157,326
Changes in fair value recognized during the quarter relating to assets still held at March 31, 2021	278,282	(627,201)
Loans to REO		0
Recurring [Member] \| Mortgage servicing rights [Member] \| Previously Reported
Assets:
Beginning balance	$ 1,755,236
Recurring [Member] \| Mortgage servicing rights [Member]
Assets:
Beginning balance		109,513
Purchases and issuances		0
Repayments and sales		0
Capitalization of interest and fees		0
ESS received pursuant to a recapture agreement with PFSI		0
Amounts (incurred) received pursuantto sales of loans		(26,649)
Changes in instrument-specific credit risk		0
Other factors		(492,513)
Total		(492,513)
Transfers:
Interest rate lock commitments to loans acquired for sale		0
Ending balance		(409,649)
Changes in fair value recognized during the quarter relating to assets still held at March 31, 2021		(492,513)
Loans to REO		$ 0

Fair Value - Fair Values and Re

Fair Value - Fair Values and Related Principal Amounts Due upon Maturity of Loans Accounted for Under Fair Value Option (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Loans, fair value [Abstract]
Fair value	$ 117,647	$ 151,734
Fair value, Total	117,647	151,734
Loans, principal amount due upon maturity [Abstract]
Principal amount due upon maturity	124,677	154,124
Loans, difference, [Abstract]
Difference	(7,030)	(2,390)
Loans acquired for sale at fair value [Member]
Loans, fair value [Abstract]
Current through 89 days delinquent	4,639,977	3,545,100
90 or more days delinquent, not in foreclosure	6,589	6,591
90 or more days delinquent, in foreclosure	195	199
Fair value	6,784	6,790
Fair value, Total	4,646,761	3,551,890
Loans, principal amount due upon maturity [Abstract]
Current through 89 days delinquent	4,568,613	3,377,970
90 or more days delinquent, not in foreclosure	7,306	8,006
90 or more days delinquent, in foreclosure	235	235
Principal amount due upon maturity	4,576,154	3,386,211
Loans, difference, [Abstract]
Current through 89 days delinquent	71,364	167,130
90 or more days delinquent, not in foreclosure	(717)	(1,415)
90 or more days delinquent, in foreclosure	(40)	(36)
Difference	70,607	165,679
Loans acquired for sale at fair value [Member] \| Nonperforming mortgage loans [Member]
Loans, principal amount due upon maturity [Abstract]
Principal amount due upon maturity	7,541	8,241
Loans, difference, [Abstract]
Difference	(757)	(1,451)
Loans at Fair Value Held in Consolidated VIE [Member]
Loans, fair value [Abstract]
Current through 89 days delinquent	107,468	140,052
90 or more days delinquent, not in foreclosure	2,377	3,655
90 or more days delinquent, in foreclosure	0	0
Fair value	109,845	143,707
Loans, principal amount due upon maturity [Abstract]
Current through 89 days delinquent	101,015	128,787
90 or more days delinquent, not in foreclosure	2,885	4,240
90 or more days delinquent, in foreclosure	0	0
Principal amount due upon maturity	103,900	133,027
Loans, difference, [Abstract]
Current through 89 days delinquent	6,453	11,265
90 or more days delinquent, not in foreclosure	(508)	(585)
90 or more days delinquent, in foreclosure	0	0
Difference	5,945	10,680
Loans at Fair Value Held in Consolidated VIE [Member] \| Nonperforming mortgage loans [Member]
Loans, fair value [Abstract]
Fair value	2,377	3,655
Loans, principal amount due upon maturity [Abstract]
Principal amount due upon maturity	2,885	4,240
Loans, difference, [Abstract]
Difference	(508)	(585)
Distressed Loans at Fair Value [Member]
Loans, fair value [Abstract]
Current through 89 days delinquent	2,460	2,071
90 or more days delinquent, not in foreclosure	3,074	3,714
90 or more days delinquent, in foreclosure	2,268	2,242
Fair value	7,802	8,027
Loans, principal amount due upon maturity [Abstract]
Current through 89 days delinquent	4,336	4,099
90 or more days delinquent, not in foreclosure	10,807	12,357
90 or more days delinquent, in foreclosure	5,634	4,641
Principal amount due upon maturity	20,777	21,097
Loans, difference, [Abstract]
Current through 89 days delinquent	(1,876)	(2,028)
90 or more days delinquent, not in foreclosure	(7,733)	(8,643)
90 or more days delinquent, in foreclosure	(3,366)	(2,399)
Difference	(12,975)	(13,070)
Distressed Loans at Fair Value [Member] \| Nonperforming mortgage loans [Member]
Loans, fair value [Abstract]
Fair value	5,342	5,956
Loans, principal amount due upon maturity [Abstract]
Principal amount due upon maturity	16,441	16,998
Loans, difference, [Abstract]
Difference	$ (11,099)	$ (11,042)

Fair Value - Summary of Chang_2

Fair Value - Summary of Changes in Fair Value Included in Current Period Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)		$ (519,162)
Net Gain on Loans Acquired for Sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)		(26,649)
Net (Loss) Gain on Investments [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)		(492,513)
Net Loan Servicing Fees [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)		0
Net Interest (Expense) Income [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)		0
Credit Risk Transfer Strips [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	$ 125,826	(215,125)
Credit Risk Transfer Strips [Member] \| Net Gain on Loans Acquired for Sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	0	0
Credit Risk Transfer Strips [Member] \| Net (Loss) Gain on Investments [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	125,826	(215,125)
Credit Risk Transfer Strips [Member] \| Net Loan Servicing Fees [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	0	0
Credit Risk Transfer Strips [Member] \| Net Interest (Expense) Income [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	0	0
Interest-only security payable [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	(8,165)	11,575
Interest-only security payable [Member] \| Net Gain on Loans Acquired for Sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	0	0
Interest-only security payable [Member] \| Net (Loss) Gain on Investments [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	(8,165)	11,575
Interest-only security payable [Member] \| Net Loan Servicing Fees [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	0	0
Interest-only security payable [Member] \| Net Interest (Expense) Income [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	0	0
Asset-Backed Financing of the VIE at Fair Value [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	1,689	(563)
Asset-Backed Financing of the VIE at Fair Value [Member] \| Net Gain on Loans Acquired for Sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	0	0
Asset-Backed Financing of the VIE at Fair Value [Member] \| Net (Loss) Gain on Investments [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	900	1,928
Asset-Backed Financing of the VIE at Fair Value [Member] \| Net Loan Servicing Fees [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	0	0
Asset-Backed Financing of the VIE at Fair Value [Member] \| Net Interest (Expense) Income [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	789	(2,491)
Liabilities, Total [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	(6,476)	11,012
Liabilities, Total [Member] \| Net Gain on Loans Acquired for Sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	0	0
Liabilities, Total [Member] \| Net (Loss) Gain on Investments [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	(7,265)	13,503
Liabilities, Total [Member] \| Net Loan Servicing Fees [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	0	0
Liabilities, Total [Member] \| Net Interest (Expense) Income [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	789	(2,491)
Mortgage-backed securities at fair value [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	(73,640)	103,965
Mortgage-backed securities at fair value [Member] \| Net Gain on Loans Acquired for Sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	0	0
Mortgage-backed securities at fair value [Member] \| Net (Loss) Gain on Investments [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	(71,117)	115,967
Mortgage-backed securities at fair value [Member] \| Net Loan Servicing Fees [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	0	0
Mortgage-backed securities at fair value [Member] \| Net Interest (Expense) Income [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	(2,523)	(12,002)
Loans acquired for sale at fair value [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	(106,664)	147,558
Loans acquired for sale at fair value [Member] \| Net Gain on Loans Acquired for Sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	(106,664)	147,558
Loans acquired for sale at fair value [Member] \| Net (Loss) Gain on Investments [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	0	0
Loans acquired for sale at fair value [Member] \| Net Loan Servicing Fees [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	0	0
Loans acquired for sale at fair value [Member] \| Net Interest (Expense) Income [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	0	0
Loans at fair value [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	(1,425)	(3,717)
Loans at fair value [Member] \| Net Gain on Loans Acquired for Sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	0	0
Loans at fair value [Member] \| Net (Loss) Gain on Investments [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	(2,250)	(4,010)
Loans at fair value [Member] \| Net Loan Servicing Fees [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	0	0
Loans at fair value [Member] \| Net Interest (Expense) Income [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	825	293
Excess servicing spread [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	2,317	(12,548)
Excess servicing spread [Member] \| Net Gain on Loans Acquired for Sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	0	0
Excess servicing spread [Member] \| Net (Loss) Gain on Investments [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	1,037	(14,522)
Excess servicing spread [Member] \| Net Loan Servicing Fees [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	0	0
Excess servicing spread [Member] \| Net Interest (Expense) Income [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	1,280	1,974
MSRs at fair value [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	278,282	(627,201)
MSRs at fair value [Member] \| Net Gain on Loans Acquired for Sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	0	0
MSRs at fair value [Member] \| Net (Loss) Gain on Investments [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	0	0
MSRs at fair value [Member] \| Net Loan Servicing Fees [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	278,282	(627,201)
MSRs at fair value [Member] \| Net Interest (Expense) Income [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	0	0
Assets, Total [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	224,696	(1,126,230)
Assets, Total [Member] \| Net Gain on Loans Acquired for Sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	(106,664)	120,909
Assets, Total [Member] \| Net (Loss) Gain on Investments [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	53,496	(610,203)
Assets, Total [Member] \| Net Loan Servicing Fees [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	278,282	(627,201)
Assets, Total [Member] \| Net Interest (Expense) Income [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income (expense)	$ (418)	$ (9,735)

Fair Value - Summary of Carryin

Fair Value - Summary of Carrying Value of Assets Re-measured Based on Fair Value on Nonrecurring Basis (Detail) - Nonrecurring [Member] - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate acquired in settlement of loans	$ 11,161	$ 12,656
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate acquired in settlement of loans	0	0
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate acquired in settlement of loans	0	0
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate acquired in settlement of loans	$ 11,161	$ 12,656

Fair Value - Summary of Chang_3

Fair Value - Summary of Changes in Fair Value Recognized in Assets that Remeasured at Fair Value on a Nonrecurring Basis (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate asset acquired in settlement of loans	$ (649)	$ (1,191)

Fair Value - Fair Values of Not

Fair Value - Fair Values of Notes Payable Secured by Credit Risk Transfer and Mortgage Servicing Rights and Exchangeable Senior Notes (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Notes Payable Secured by Credit Risk Transfer and Mortgage Servicing Assets [Member] \| Carrying Value [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Notes payable	$ 2,897,794	$ 1,924,999
Notes Payable Secured by Credit Risk Transfer and Mortgage Servicing Assets [Member] \| Fair Value [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Notes payable	2,803,523	1,871,276
Exchangeable Notes [Member] \| Carrying Value [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Notes payable	494,097	196,796
Exchangeable Notes [Member] \| Fair Value [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Notes payable	$ 563,526	$ 207,428

Fair Value - Additional Informa

Fair Value - Additional Information (Detail)	3 Months Ended
Fair Value - Additional Information (Detail)	Mar. 31, 2021
Level 3 [Member] \| Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated loans at fair value of cash flows valuation, discounted annual rate	20.00%

Fair Value - Summary of Key Inp

Fair Value - Summary of Key Inputs Used in Determining Fair Value of ESS (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Excess servicing spread purchased from PFSI	$ 0		$ 131,750
UPB of underlying loans (in thousands)	$ 32,448,891	$ 19,341,270
Excess servicing spread [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Excess servicing spread purchased from PFSI			131,750
Excess servicing spread [Member] \| Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
UPB of underlying loans (in thousands)			$ 15,833,050
Average servicing fee rate (in basis points)			0.34%
Average ESS rate (in basis points)			0.19%
Pricing spread			5.10%
Annual total prepayment speed			11.70%
Life (in years)			5 years 9 months 18 days
Excess servicing spread [Member] \| Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Pricing spread			4.90%
Annual total prepayment speed			9.60%
Life (in years)			2 years 3 months 18 days
Excess servicing spread [Member] \| Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Pricing spread			5.30%
Annual total prepayment speed			18.30%
Life (in years)			6 years 7 months 6 days

Fair Value - Quantitative Summa

Fair Value - Quantitative Summary of Key Unobservable Inputs Used in Review and Approval of Broker-provided Fair Values for CRT Derivatives (Detail) - CRT Derivatives [Member] - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Fair value of CRT derivatives
Fair value of CRT derivatives assets	$ 58,134	$ 58,699
Fair value of CRT derivatives liabilities	13,458	26,904
UPB of loans in reference pools	$ 11,539,702	$ 13,854,426
Discount Rate [Member] \| Minimum [Member]
Fair value of CRT derivatives
Key inputs used in fair value for CRT agreements	6.00%	6.70%
Key inputs used in fair value for CRT agreements	(0.50%)	(0.80%)
Discount Rate [Member] \| Weighted Average [Member]
Fair value of CRT derivatives
Key inputs used in fair value for CRT agreements	7.10%	7.30%
Key inputs used in fair value for CRT agreements	(0.10%)	(0.20%)
Discount Rate [Member] \| Maximum [Member]
Fair value of CRT derivatives
Key inputs used in fair value for CRT agreements	7.30%	9.00%
Key inputs used in fair value for CRT agreements	1.20%	1.10%
Voluntary Prepayment Speed [Member] \| Minimum [Member]
Fair value of CRT derivatives
Key inputs used in fair value for CRT agreements	13.00%	20.80%
Voluntary Prepayment Speed [Member] \| Weighted Average [Member]
Fair value of CRT derivatives
Key inputs used in fair value for CRT agreements	13.10%	21.90%
Voluntary Prepayment Speed [Member] \| Maximum [Member]
Fair value of CRT derivatives
Key inputs used in fair value for CRT agreements	13.60%	23.50%
Remaining Loss Expectation [Member] \| Minimum [Member]
Fair value of CRT derivatives
Key inputs used in fair value for CRT agreements	(0.60%)	(0.60%)
Remaining Loss Expectation [Member] \| Weighted Average [Member]
Fair value of CRT derivatives
Key inputs used in fair value for CRT agreements	(0.20%)	(0.30%)
Remaining Loss Expectation [Member] \| Maximum [Member]
Fair value of CRT derivatives
Key inputs used in fair value for CRT agreements	0.60%	0.60%

Fair Value - Quantitative Sum_2

Fair Value - Quantitative Summary of Key Unobservable Inputs Used in Valuation of Interest Rate Lock Commitments (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Pull-Through Rate [Member] \| Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation of IRLCs	42.00%	44.60%
Pull-Through Rate [Member] \| Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation of IRLCs	92.90%	86.30%
Pull-Through Rate [Member] \| Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation of IRLCs	100.00%	100.00%
Servicing Fee Multiple [Member] \| Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation of IRLCs	1.20%	2.00%
Servicing Fee Multiple [Member] \| Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation of IRLCs	5.00%	4.40%
Servicing Fee Multiple [Member] \| Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation of IRLCs	6.50%	5.30%
Percentage of UPB [Member] \| Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation of IRLCs	0.30%	0.50%
Percentage of UPB [Member] \| Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation of IRLCs	1.30%	1.20%
Percentage of UPB [Member] \| Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation of IRLCs	2.10%	1.90%
Interest Rate Lock Commitments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	$ (64,858)	$ 72,386

Fair Value - Summary of Key Uno

Fair Value - Summary of Key Unobservable Inputs Used in Valuation Credit Risk Transfer Strips (Detail) - Credit Risk Transfer Strips [Member] - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of CRT derivatives liabilities	$ 109,570	$ 202,792
UPB of loans in the reference pools	$ 36,863,982	$ 44,843,516
Minimum [Member] \| Discount Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation	6.40%	6.00%
Minimum [Member] \| Voluntary Prepayment Speed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation	15.70%	25.00%
Minimum [Member] \| Involuntary Prepayment Speed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation	0.50%	0.80%
Minimum [Member] \| Remaining Loss Expectation [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation	0.40%	0.30%
Maximum [Member] \| Discount Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation	8.00%	8.40%
Maximum [Member] \| Voluntary Prepayment Speed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation	18.60%	30.20%
Maximum [Member] \| Involuntary Prepayment Speed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation	1.10%	1.70%
Maximum [Member] \| Remaining Loss Expectation [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation	0.70%	0.60%
Weighted Average [Member] \| Discount Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation	7.80%	8.00%
Weighted Average [Member] \| Voluntary Prepayment Speed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation	16.20%	26.20%
Weighted Average [Member] \| Involuntary Prepayment Speed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation	0.60%	1.00%
Weighted Average [Member] \| Remaining Loss Expectation [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation	0.40%	0.40%

Fair Value - Key Assumptions Us

Fair Value - Key Assumptions Used in Determining Fair Value of MSRs at Time of Initial Recognition (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)$ / Loan	Mar. 31, 2020USD ($)$ / Loan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, MSR recognized \| $	$ 407,696	$ 248,822
Fair value, UPB of underlying loans \| $	$ 32,448,891	$ 19,341,270
Fair value, Weighted-average annual servicing fee rate (in basis points)	0.26%	0.30%
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value inputs, Pricing spread during period	8.00%	6.70%
Fair Value inputs, Prepayment speed during period	6.00%	9.90%
Fair Value inputs, Weighted average life during period	3 years 7 months 6 days	3 years 7 months 6 days
Fair Value inputs, Annual per loan cost of servicing during period	81	78
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value inputs, Pricing spread during period	8.00%	9.90%
Fair Value inputs, Prepayment speed during period	9.30%	20.90%
Fair Value inputs, Weighted average life during period	8 years 10 months 24 days	6 years 10 months 24 days
Fair Value inputs, Annual per loan cost of servicing during period	81	78
Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value inputs, Pricing spread during period	8.00%	6.80%
Fair Value inputs, Prepayment speed during period	7.50%	12.20%
Fair Value inputs, Weighted average life during period	8 years 6 months	6 years 6 months
Fair Value inputs, Annual per loan cost of servicing during period	81	78

Fair Value - Quantitative Sum_3

Fair Value - Quantitative Summary of Key Assumptions Used in Valuation of MSRs as of Dates Presented, and Effect on Estimated Fair Value from Adverse Changes in Those Inputs (Detail) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021USD ($)$ / Loan	Dec. 31, 2020USD ($)$ / Loan	Mar. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Balance at end of period	$ 2,441,214	$ 1,755,236	$ 1,157,326	$ 1,535,705
UPB of underlying loans, Fair Value	$ 183,463,662	$ 170,728,322
Weighted-average annual servicing fee rate (in basis points), Fair value input	0.27%	0.28%
Weighted-average note interest rate, Fair value	3.40%	3.60%
Pricing Spread [Member] \| Effect On Value Of Five Percentage Adverse Change
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Effect on value of percentage adverse change, Fair value input	$ (38,465)	$ (31,400)
Pricing Spread [Member] \| Effect On Value Of Ten Percentage Adverse Change
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Effect on value of percentage adverse change, Fair value input	(75,820)	(61,718)
Pricing Spread [Member] \| Effect On Value Of Twenty Percentage Adverse Change
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Effect on value of percentage adverse change, Fair value input	(147,372)	(119,305)
Prepayment Speed [Member] \| Effect On Value Of Five Percentage Adverse Change
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Effect on value of percentage adverse change, Fair value input	(48,777)	(48,136)
Prepayment Speed [Member] \| Effect On Value Of Ten Percentage Adverse Change
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Effect on value of percentage adverse change, Fair value input	(95,920)	(94,244)
Prepayment Speed [Member] \| Effect On Value Of Twenty Percentage Adverse Change
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Effect on value of percentage adverse change, Fair value input	(185,623)	(180,820)
Cost of Servicing [Member] \| Effect On Value Of Five Percentage Adverse Change
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Effect on value of percentage adverse change, Fair value input	(15,709)	(11,846)
Cost of Servicing [Member] \| Effect On Value Of Ten Percentage Adverse Change
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Effect on value of percentage adverse change, Fair value input	(31,419)	(23,692)
Cost of Servicing [Member] \| Effect On Value Of Twenty Percentage Adverse Change
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Effect on value of percentage adverse change, Fair value input	$ (62,838)	$ (47,385)
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value inputs, Pricing spread	6.80%	8.00%
Estimated fair value inputs, Prepayment speed	8.50%	12.40%
Estimated fair value inputs, Annual per-loan cost of servicing \| $ / Loan	79	77
Minimum [Member] \| Mortgage service rights [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value inputs, Life (in years)	3 years 1 month 6 days	2 years 10 months 24 days
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value inputs, Pricing spread	9.90%	11.10%
Estimated fair value inputs, Prepayment speed	24.20%	28.80%
Estimated fair value inputs, Annual per-loan cost of servicing \| $ / Loan	149	121
Maximum [Member] \| Mortgage service rights [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value inputs, Life (in years)	8 years 1 month 6 days	6 years 9 months 18 days
Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value inputs, Pricing spread	6.80%	8.00%
Estimated fair value inputs, Prepayment speed	8.80%	12.80%
Estimated fair value inputs, Annual per-loan cost of servicing \| $ / Loan	80	81
Weighted Average [Member] \| Mortgage service rights [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value inputs, Life (in years)	7 years 9 months 18 days	6 years 6 months

Mortgage-Backed Securities - Su

Mortgage-Backed Securities - Summary of Investment in Mortgage Backed Securities Activity (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Mortgage Backed Securities [Line Items]
Balance at beginning of quarter	$ 2,213,922
Changes in fair value included in income arising from:
Balance at end of quarter	1,916,485
Mortgage Backed Securities [Member]
Mortgage Backed Securities [Line Items]
Balance at beginning of quarter	2,213,922	$ 2,839,633
Purchases	1,259,189	1,615,486
Sales	(1,300,653)	(488,729)
Repayments	(182,333)	(122,935)
Changes in fair value included in income arising from:
Amortization of net purchase premiums	(2,523)	(12,002)
Valuation adjustments	(71,117)	115,967
Total changes in fair value included in income	(73,640)	103,965
Balance at end of quarter	$ 1,916,485	$ 3,947,420

Mortgage-Backed Securities - _2

Mortgage-Backed Securities - Summary of Investment in Mortgage Backed Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Mortgage Backed Securities [Line Items]
Fair value	$ 1,916,485	$ 2,213,922
Mortgage Backed Securities [Member]
Mortgage Backed Securities [Line Items]
Principal balance	1,917,665	2,117,513
Unamortized net purchase premiums	60,991	56,106
Accumulated valuation changes	(62,171)	40,303
Fair value	1,916,485	2,213,922
Freddie Mac [Member] \| Mortgage Backed Securities [Member]
Mortgage Backed Securities [Line Items]
Principal balance	654,051	1,253,755
Unamortized net purchase premiums	20,729	32,414
Accumulated valuation changes	(21,741)	24,867
Fair value	653,039	1,311,036
Fannie Mae [Member] \| Mortgage Backed Securities [Member]
Mortgage Backed Securities [Line Items]
Principal balance	1,263,614	863,758
Unamortized net purchase premiums	40,262	23,692
Accumulated valuation changes	(40,430)	15,436
Fair value	$ 1,263,446	$ 902,886

Mortgage-Backed Securities - _3

Mortgage-Backed Securities - Summary of Investment in Mortgage Backed Securities (Parenthetical) (Detail)	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Minimum [Member]
Mortgage Backed Securities [Line Items]
Mortgage backed securities, maturity period	10 years	10 years

Loans Acquired for Sale at Fa_3

Loans Acquired for Sale at Fair Value - Summary of Distribution of Company's Loans Acquired for Sale at Fair Value (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans acquired for sale at fair value	$ 4,646,761	$ 3,551,890
Loans pledged to secure total	4,590,193	3,501,847
Loans acquired for sale at fair value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans pledged to secure Assets sold under agreements to repurchase	4,519,274	3,484,202
PennyMac Loan Services, LLC [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans acquired for sale at fair value	327,881	460,414
Mortgage Loans Acquired for Sale [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans pledged to secure mortgage loan participation purchase and sale agreements	70,919	17,645
Agency-Eligible [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans acquired for sale at fair value	4,284,646	3,057,601
Held for Sale to PLS - Government-Insured or Guaranteed [Member] \| PennyMac Loan Services, LLC [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans acquired for sale at fair value	327,881	460,414
Home Equity Lines of Credit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans acquired for sale at fair value	4,864	5,566
Commercial Real Estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans acquired for sale at fair value	998	1,010
Repurchased Pursuant to Representations and Warranties [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans acquired for sale at fair value	$ 28,372	$ 27,299

Loans at Fair Value - Summary o

Loans at Fair Value - Summary of Distribution of Company's Loans at Fair Value (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment [Line Items]
Asset-backed financing of a VIE at fair value	$ 109,845	$ 143,707
Loans at fair value pledged to secure	111,228	147,410
Fair value	117,647	151,734
Distressed [Member]
Financing Receivable, Recorded Investment [Line Items]
Fair value	7,802	8,027
Fixed interest rate jumbo loans held in a VIE [Member]
Financing Receivable, Recorded Investment [Line Items]
Fair value	109,845	143,707
Loans acquired for sale at fair value [Member]
Financing Receivable, Recorded Investment [Line Items]
Assets sold under agreements to repurchase	1,383	3,703
Fair value	$ 4,646,761	$ 3,551,890

Derivative and Credit Risk Tr_3

Derivative and Credit Risk Transfer Strip Assets and Liabilities - Summary of Derivative and Credit Risk Transfer Assets and Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative assets	$ 182,969	$ 164,318
Credit risk transfer strip assets	0	0
Derivative and credit risk transfer strip assets	182,969	164,318
Derivative liabilities	120,400	60,681
Credit risk transfer strip liabilities	109,570	202,792
Derivative and credit risk transfer strip liabilities	$ 229,970	$ 263,473

Derivative and Credit Risk Tr_4

Derivative and Credit Risk Transfer Strip Assets and Liabilities - Derivative Assets and Derivative Liabilities and Related Margin Deposits Recorded in Other Assets (Detail) - USD ($)		Mar. 31, 2027	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021	Mar. 03, 2021	Dec. 31, 2020
Derivatives Fair Value [Line Items]
Total derivative assets instruments before netting								$ 354,694,000		$ 223,648,000
Derivative assets, Netting								(171,725,000)		(59,330,000)
Total derivative and credit risk transfer strip assets after netting								182,969,000		164,318,000
Margin deposits (received from) placed with derivatives counterparties, net								(94,258,000)		30,197,000
Derivative assets pledged to secure:
Notes payable secured by credit risk transfer and mortgage servicing assets		$ 0	$ 350,000,000	$ 0	$ 1,515,071,000	$ 804,448,000	$ 139,269,000	2,897,794,000	$ 2,808,788,000	1,924,999,000
Total derivative liabilities								197,866,000		150,213,000
Derivative liabilities, Netting								(77,466,000)		(89,532,000)
Total derivative liabilities after netting								120,400,000		60,681,000
Margin deposits (received from) placed with derivatives counterparties, net								77,466,000		89,532,000
Derivative assets related to CRT Derivatives [Member]
Derivative assets pledged to secure:
Notes payable secured by credit risk transfer and mortgage servicing assets								58,134,000		58,699,000
CRT Derivatives [Member]
Derivatives Fair Value [Line Items]
Notional amount	[1]							11,539,702,000		13,854,426,000
Total derivative assets instruments before netting								58,134,000		58,699,000
Derivative assets, Netting								0		0
Total derivative and credit risk transfer strip assets after netting								58,134,000		58,699,000
Derivative assets pledged to secure:
Total derivative liabilities								13,458,000		26,904,000
Swaption Purchase Contracts
Derivatives Fair Value [Line Items]
Total derivative assets instruments before netting	[2]							29,034,000		8,505,000
Forward Purchase Contracts [Member]
Derivatives Fair Value [Line Items]
Notional amount	[1],[2]							15,169,597,000		17,563,549,000
Total derivative assets instruments before netting	[2]							6,687,000		72,526,000
Derivative assets, Netting								0		0
Total derivative and credit risk transfer strip assets after netting								6,687,000		72,526,000
Derivative assets pledged to secure:
Total derivative liabilities								89,312,000		17,000
Derivative liabilities, Netting								0		0
Margin deposits (received from) placed with derivatives counterparties, net								0		0
Forward Sale Contracts [Member]
Derivatives Fair Value [Line Items]
Notional amount	[1],[2]							24,946,663,000		26,615,716,000
Total derivative assets instruments before netting	[2]							182,192,000		92,000
Derivative assets, Netting								0		0
Total derivative and credit risk transfer strip assets after netting								182,192,000		92,000
Derivative assets pledged to secure:
Total derivative liabilities								6,965,000		122,884,000
Derivative liabilities, Netting								0		0
Margin deposits (received from) placed with derivatives counterparties, net								0		0
Swaption Purchase Contracts
Derivatives Fair Value [Line Items]
Notional amount	[1],[2]							3,136,300,000		3,655,000,000
Total derivative assets instruments before netting								29,034,000		8,505,000
Derivative assets, Netting								0		0
Total derivative and credit risk transfer strip assets after netting								29,034,000		8,505,000
Derivative assets pledged to secure:
Total derivative liabilities								0		0
Interest Rate Lock Commitments [Member]
Derivatives Fair Value [Line Items]
Notional amount	[1]							8,525,688,000		10,588,208,000
Total derivative assets instruments before netting								7,552,000		72,794,000
Total derivative and credit risk transfer strip assets after netting								7,552,000		72,794,000
Derivative assets pledged to secure:
Total derivative liabilities								72,410,000		408,000
Call Options on Interest Rate Futures Purchase Contracts [Member]
Derivatives Fair Value [Line Items]
Notional amount	[1],[2]							2,550,000,000		1,450,000,000
Total derivative assets instruments before netting	[2]							992,000		3,070,000
Derivative assets, Netting								0		0
Total derivative and credit risk transfer strip assets after netting								992,000		3,070,000
Derivative assets pledged to secure:
Total derivative liabilities								0		0
Put Options On Interest Rate Futures Purchase Contracts
Derivatives Fair Value [Line Items]
Notional amount	[1],[2]							3,750,000,000		2,800,000,000
Total derivative assets instruments before netting	[2]							18,938,000		4,742,000
Derivative assets, Netting								0		0
Total derivative and credit risk transfer strip assets after netting								18,938,000		4,742,000
Derivative assets pledged to secure:
Total derivative liabilities								0		0
Put Options On Interest Rate Futures Sale Contracts
Derivatives Fair Value [Line Items]
Notional amount	[1],[2]							562,500,000		0
Total derivative assets instruments before netting	[2]							0		0
Derivative assets pledged to secure:
Total derivative liabilities								6,064,000		0
Derivative liabilities, Netting								0		0
Margin deposits (received from) placed with derivatives counterparties, net								0		0
MBS Put Options [Member]
Derivatives Fair Value [Line Items]
Notional amount	[1],[2]							3,600,000,000		3,625,000,000
Total derivative assets instruments before netting	[2]							51,165,000		3,220,000
Derivative assets, Netting								0		0
Total derivative and credit risk transfer strip assets after netting								51,165,000		3,220,000
Derivative assets pledged to secure:
Total derivative liabilities								9,657,000		0
Derivative liabilities, Netting								0		0
Margin deposits (received from) placed with derivatives counterparties, net								0		0
Swap Futures [Member]
Derivatives Fair Value [Line Items]
Notional amount	[1],[2]							2,750,000,000		1,950,000,000
Total derivative assets instruments before netting	[2]							0		0
Derivative assets pledged to secure:
Total derivative liabilities								0		0
Bond Futures [Member]
Derivatives Fair Value [Line Items]
Notional amount	[1],[2]							401,500,000		66,500,000
Total derivative assets instruments before netting	[2]							0		0
Derivative assets pledged to secure:
Total derivative liabilities								$ 0		$ 0

[1]	Notional amounts provide an indication of the volume of the Company’s derivative activity.
[2]	All hedging derivatives are interest rate derivatives that are used as economic hedges.

Derivative and Credit Risk Tr_5

Derivative and Credit Risk Transfer Strip Assets and Liabilities - Summary of Net Derivative Assets (Detail) - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020
Offsetting Assets [Line Items]
Gross amounts of recognized assets		$ 354,694	$ 223,648
Gross amounts offset in the consolidated balance sheet		(171,725)	(59,330)
Total derivative and credit risk transfer strip assets after netting		182,969	164,318
CRT Derivatives [Member]
Offsetting Assets [Line Items]
Gross amounts of recognized assets		58,134	58,699
Gross amounts offset in the consolidated balance sheet		0	0
Total derivative and credit risk transfer strip assets after netting		58,134	58,699
Forward Purchase Contracts [Member]
Offsetting Assets [Line Items]
Gross amounts of recognized assets	[1]	6,687	72,526
Gross amounts offset in the consolidated balance sheet		0	0
Total derivative and credit risk transfer strip assets after netting		6,687	72,526
Forward Sale Contracts [Member]
Offsetting Assets [Line Items]
Gross amounts of recognized assets	[1]	182,192	92
Gross amounts offset in the consolidated balance sheet		0	0
Total derivative and credit risk transfer strip assets after netting		182,192	92
Swaption Purchase Contracts
Offsetting Assets [Line Items]
Gross amounts of recognized assets		29,034	8,505
Gross amounts offset in the consolidated balance sheet		0	0
Total derivative and credit risk transfer strip assets after netting		29,034	8,505
Interest Rate Lock Commitments [Member]
Offsetting Assets [Line Items]
Gross amounts of recognized assets		7,552	72,794
Total derivative and credit risk transfer strip assets after netting		7,552	72,794
Call Options on Interest Rate Futures Purchase Contracts [Member]
Offsetting Assets [Line Items]
Gross amounts of recognized assets	[1]	992	3,070
Gross amounts offset in the consolidated balance sheet		0	0
Total derivative and credit risk transfer strip assets after netting		992	3,070
Put Options On Interest Rate Futures Purchase Contracts
Offsetting Assets [Line Items]
Gross amounts of recognized assets	[1]	18,938	4,742
Gross amounts offset in the consolidated balance sheet		0	0
Total derivative and credit risk transfer strip assets after netting		18,938	4,742
MBS Put Options [Member]
Offsetting Assets [Line Items]
Gross amounts of recognized assets	[1]	51,165	3,220
Gross amounts offset in the consolidated balance sheet		0	0
Total derivative and credit risk transfer strip assets after netting		51,165	3,220
Netting [Member]
Offsetting Assets [Line Items]
Gross amounts of recognized assets		0	0
Gross amounts offset in the consolidated balance sheet		(171,725)	(59,330)
Total derivative and credit risk transfer strip assets after netting		(171,725)	(59,330)
Derivatives Subject to Master Netting Arrangements [Member]
Offsetting Assets [Line Items]
Gross amounts of recognized assets		289,008	92,155
Gross amounts offset in the consolidated balance sheet		(171,725)	(59,330)
Total derivative and credit risk transfer strip assets after netting		117,283	32,825
Derivatives Not Subject To Master Netting Adjustment [Member]
Offsetting Assets [Line Items]
Gross amounts of recognized assets		65,686	131,493
Gross amounts offset in the consolidated balance sheet		0	0
Total derivative and credit risk transfer strip assets after netting		65,686	131,493
Derivatives Not Subject To Master Netting Adjustment [Member] \| Interest Rate Lock Commitments [Member]
Offsetting Assets [Line Items]
Gross amounts of recognized assets		7,552	72,794
Gross amounts offset in the consolidated balance sheet		0	0
Total derivative and credit risk transfer strip assets after netting		$ 7,552	$ 72,794

[1]	All hedging derivatives are interest rate derivatives that are used as economic hedges.

Derivative and Credit Risk Tr_6

Derivative and Credit Risk Transfer Strip Assets and Liabilities - Summary of Derivative Assets, Financial Instruments and Collateral Held by Counterparty (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Offsetting Assets [Line Items]
Total derivative and credit risk transfer strip assets after netting	$ 182,969	$ 164,318
Financial instruments	0	0
Cash collateral received	0	0
Net amount	182,969	164,318
CRT Derivatives [Member]
Offsetting Assets [Line Items]
Total derivative and credit risk transfer strip assets after netting	58,134	58,699
Financial instruments	0	0
Cash collateral received	0	0
Net amount	58,134	58,699
Interest Rate Lock Commitments [Member]
Offsetting Assets [Line Items]
Total derivative and credit risk transfer strip assets after netting	7,552	72,794
Financial instruments	0	0
Cash collateral received	0	0
Net amount	7,552	72,794
Federal Home Loan Mortgage [Member]
Offsetting Assets [Line Items]
Total derivative and credit risk transfer strip assets after netting	31,652	0
Financial instruments	0	0
Cash collateral received	0	0
Net amount	31,652	0
J.P. Morgan Securities LLC [Member]
Offsetting Assets [Line Items]
Total derivative and credit risk transfer strip assets after netting	29,455	0
Financial instruments	0	0
Cash collateral received	0	0
Net amount	29,455	0
Wells Fargo Securities, LLC [Member]
Offsetting Assets [Line Items]
Total derivative and credit risk transfer strip assets after netting	16,087	0
Financial instruments	0	0
Cash collateral received	0	0
Net amount	16,087	0
RJ O'Brien & Associates, LLC [Member]
Offsetting Assets [Line Items]
Total derivative and credit risk transfer strip assets after netting	13,865	7,813
Financial instruments	0	0
Cash collateral received	0	0
Net amount	13,865	7,813
Bank of America, N.A. [Member]
Offsetting Assets [Line Items]
Total derivative and credit risk transfer strip assets after netting	13,191	15,406
Financial instruments	0	0
Cash collateral received	0	0
Net amount	13,191	15,406
Morgan Stanley And Company. LLC [Member]
Offsetting Assets [Line Items]
Total derivative and credit risk transfer strip assets after netting	7,949	0
Financial instruments	0	0
Cash collateral received	0	0
Net amount	7,949	0
Citigroup Global Markets Inc. [Member]
Offsetting Assets [Line Items]
Total derivative and credit risk transfer strip assets after netting	3,431	2,416
Financial instruments	0	0
Cash collateral received	0	0
Net amount	3,431	2,416
PNC Capital Markets LLC [Member]
Offsetting Assets [Line Items]
Total derivative and credit risk transfer strip assets after netting	13	3,138
Financial instruments	0	0
Cash collateral received	0	0
Net amount	13	3,138
Deutsche Bank Securities LLC [Member]
Offsetting Assets [Line Items]
Total derivative and credit risk transfer strip assets after netting	0	1,602
Financial instruments	0	0
Cash collateral received	0	0
Net amount	0	1,602
Mitsubishi U F J Securities [Member]
Offsetting Assets [Line Items]
Total derivative and credit risk transfer strip assets after netting	0	1,070
Financial instruments	0	0
Cash collateral received	0	0
Net amount	0	1,070
Other [Member]
Offsetting Assets [Line Items]
Total derivative and credit risk transfer strip assets after netting	1,640	1,380
Financial instruments	0	0
Cash collateral received	0	0
Net amount	$ 1,640	$ 1,380

Derivative and Credit Risk Tr_7

Derivative and Credit Risk Transfer Strip Assets and Liabilities - Schedule of Offsetting of Derivative Liabilities and Financial Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	$ 6,289,839	$ 6,459,631
Gross amounts offset in the consolidated balance sheet	(77,466)	(89,532)
Net amounts of liabilities presented in the consolidated balance sheet	6,212,373	6,370,099
Unpaid Principal Balance [Member]
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	6,098,299	6,317,928
Gross amounts offset in the consolidated balance sheet	0	0
Net amounts of liabilities presented in the consolidated balance sheet	6,098,299	6,317,928
Forward Purchase Contracts [Member]
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	89,312	17
Gross amounts offset in the consolidated balance sheet	0	0
Net amounts of liabilities presented in the consolidated balance sheet	89,312	17
Forward Sale Contracts [Member]
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	6,965	122,884
Gross amounts offset in the consolidated balance sheet	0	0
Net amounts of liabilities presented in the consolidated balance sheet	6,965	122,884
Put Options On Interest Rate Futures Sale Contracts
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	6,064	0
Gross amounts offset in the consolidated balance sheet	0	0
Net amounts of liabilities presented in the consolidated balance sheet	6,064	0
MBS Put Options [Member]
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	9,657	0
Gross amounts offset in the consolidated balance sheet	0	0
Net amounts of liabilities presented in the consolidated balance sheet	9,657	0
Netting [Member]
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	0	0
Gross amounts offset in the consolidated balance sheet	(77,466)	(89,532)
Net amounts of liabilities presented in the consolidated balance sheet	(77,466)	(89,532)
Derivatives Subject to Master Netting Arrangements [Member]
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	111,998	122,901
Gross amounts offset in the consolidated balance sheet	(77,466)	(89,532)
Net amounts of liabilities presented in the consolidated balance sheet	34,532	33,369
Derivatives Not Subject To Master Netting Adjustment [Member] \| Interest Rate Lock Commitments [Member]
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	72,410	408
Gross amounts offset in the consolidated balance sheet	0	0
Net amounts of liabilities presented in the consolidated balance sheet	72,410	408
Derivatives Not Subject To Master Netting Adjustment [Member] \| CRT Derivatives [Member]
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	13,458	26,904
Gross amounts offset in the consolidated balance sheet	0	0
Net amounts of liabilities presented in the consolidated balance sheet	13,458	26,904
Derivative Liabilities Before Netting [Member]
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	197,866	150,213
Gross amounts offset in the consolidated balance sheet	(77,466)	(89,532)
Net amounts of liabilities presented in the consolidated balance sheet	120,400	60,681
Unamortized Debt Issuance Costs [Member]
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	(6,326)	(8,510)
Gross amounts offset in the consolidated balance sheet	0	0
Net amounts of liabilities presented in the consolidated balance sheet	(6,326)	(8,510)
Security Sold Under Agreements to Repurchase [Member]
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	6,091,973	6,309,418
Gross amounts offset in the consolidated balance sheet	0	0
Net amounts of liabilities presented in the consolidated balance sheet	$ 6,091,973	$ 6,309,418

Derivative and Credit Risk Tr_8

Derivative and Credit Risk Transfer Strip Assets and Liabilities - Summary of Derivative Liabilities, Financial Liabilities and Collateral Pledged by Counterparty (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	$ 6,212,373	$ 6,370,099
Security Sold Under Agreements to Repurchase [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	6,091,973	6,309,418
Unpaid Principal Balance Before Unamortized Debt Issuance Costs Adjustment [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	6,218,699	6,378,609
Gross amounts not offset in the consolidated balance sheet, Financial instruments	(6,098,299)	(6,317,928)
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	120,400	60,681
Unpaid Principal Balance Before Unamortized Debt Issuance Costs Adjustment [Member] \| CRT Derivatives [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	13,458	26,904
Gross amounts not offset in the consolidated balance sheet, Financial instruments	0	0
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	13,458	26,904
Unpaid Principal Balance Before Unamortized Debt Issuance Costs Adjustment [Member] \| Interest Rate Lock Commitments [Member] \| Security Sold Under Agreements to Repurchase [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	72,410	408
Gross amounts not offset in the consolidated balance sheet, Financial instruments	0	0
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	72,410	408
Unpaid Principal Balance Before Unamortized Debt Issuance Costs Adjustment [Member] \| Credit Suisse Securities (USA) LLC [Member] \| Security Sold Under Agreements to Repurchase [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	1,230,324	1,059,547
Gross amounts not offset in the consolidated balance sheet, Financial instruments	(1,209,194)	(1,054,636)
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	21,130	4,911
Unpaid Principal Balance Before Unamortized Debt Issuance Costs Adjustment [Member] \| Bank of America, N.A. [Member] \| Security Sold Under Agreements to Repurchase [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	1,031,487	414,044
Gross amounts not offset in the consolidated balance sheet, Financial instruments	(1,031,487)	(414,044)
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	0	0
Unpaid Principal Balance Before Unamortized Debt Issuance Costs Adjustment [Member] \| RBC Capital Markets, L.P. [Member] \| Security Sold Under Agreements to Repurchase [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	750,308	765,892
Gross amounts not offset in the consolidated balance sheet, Financial instruments	(750,308)	(765,892)
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	0	0
Unpaid Principal Balance Before Unamortized Debt Issuance Costs Adjustment [Member] \| J.P. Morgan Securities LLC [Member] \| Security Sold Under Agreements to Repurchase [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	642,606	359,573
Gross amounts not offset in the consolidated balance sheet, Financial instruments	(642,606)	(357,211)
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	0	2,362
Unpaid Principal Balance Before Unamortized Debt Issuance Costs Adjustment [Member] \| Daiwa Capital Markets [Member] \| Security Sold Under Agreements to Repurchase [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	534,521	728,207
Gross amounts not offset in the consolidated balance sheet, Financial instruments	(534,032)	(727,562)
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	489	645
Unpaid Principal Balance Before Unamortized Debt Issuance Costs Adjustment [Member] \| Barclays Capital Inc. [Member] \| Security Sold Under Agreements to Repurchase [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	504,410	922,959
Gross amounts not offset in the consolidated balance sheet, Financial instruments	(504,410)	(922,035)
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	0	924
Unpaid Principal Balance Before Unamortized Debt Issuance Costs Adjustment [Member] \| Morgan Stanley & Co. LLC [Member] \| Security Sold Under Agreements to Repurchase [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	393,370	367,493
Gross amounts not offset in the consolidated balance sheet, Financial instruments	(393,370)	(366,415)
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	0	1,078
Unpaid Principal Balance Before Unamortized Debt Issuance Costs Adjustment [Member] \| Citigroup Global Markets Inc. [Member] \| Security Sold Under Agreements to Repurchase [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	261,628	830,161
Gross amounts not offset in the consolidated balance sheet, Financial instruments	(261,628)	(830,161)
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	0	0
Unpaid Principal Balance Before Unamortized Debt Issuance Costs Adjustment [Member] \| Goldman Sachs & Co. LLC [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	264,058	149,272
Gross amounts not offset in the consolidated balance sheet, Financial instruments	(261,528)	(144,883)
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	2,530	4,389
Unpaid Principal Balance Before Unamortized Debt Issuance Costs Adjustment [Member] \| BNP Paribas [Member] \| Security Sold Under Agreements to Repurchase [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	227,034	164,414
Gross amounts not offset in the consolidated balance sheet, Financial instruments	(227,034)	(163,548)
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	0	866
Unpaid Principal Balance Before Unamortized Debt Issuance Costs Adjustment [Member] \| Wells Fargo Securities, LLC [Member] \| Security Sold Under Agreements to Repurchase [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	143,150	148,854
Gross amounts not offset in the consolidated balance sheet, Financial instruments	(143,150)	(140,796)
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	0	8,058
Unpaid Principal Balance Before Unamortized Debt Issuance Costs Adjustment [Member] \| Amherst Pierpont Securities LLC [Member] \| Security Sold Under Agreements to Repurchase [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	139,552	153,224
Gross amounts not offset in the consolidated balance sheet, Financial instruments	(139,552)	(153,224)
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	0	0
Unpaid Principal Balance Before Unamortized Debt Issuance Costs Adjustment [Member] \| Mitsubishi U F J Securities [Member] \| Security Sold Under Agreements to Repurchase [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	4,788	0
Gross amounts not offset in the consolidated balance sheet, Financial instruments	0	0
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	4,788	0
Unpaid Principal Balance Before Unamortized Debt Issuance Costs Adjustment [Member] \| Bank of Oklahoma [Member] \| Security Sold Under Agreements to Repurchase [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	3,304	0
Gross amounts not offset in the consolidated balance sheet, Financial instruments	0	0
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	3,304	0
Unpaid Principal Balance Before Unamortized Debt Issuance Costs Adjustment [Member] \| Mizuho Securities [Member] \| Security Sold Under Agreements to Repurchase [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	1,059	279,321
Gross amounts not offset in the consolidated balance sheet, Financial instruments	0	(277,521)
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	1,059	1,800
Unpaid Principal Balance Before Unamortized Debt Issuance Costs Adjustment [Member] \| Freddie Mac [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	0	5,883
Gross amounts not offset in the consolidated balance sheet, Financial instruments	0	0
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	0	5,883
Unpaid Principal Balance Before Unamortized Debt Issuance Costs Adjustment [Member] \| Other [Member] \| Security Sold Under Agreements to Repurchase [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	1,232	2,453
Gross amounts not offset in the consolidated balance sheet, Financial instruments	0	0
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	$ 1,232	$ 2,453

Derivative and Credit Risk Tr_9

Derivative and Credit Risk Transfer Strip Assets and Liabilities - Net Gains (Losses) Recognized on Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Gain Loss on loans acquired for sale [Member] \| Interest Rate Lock Commitments [Member]
Derivative Instruments Gain Loss [Line Items]
Net gains on derivative financial instruments used as economic hedges	$ (137,243)	$ 68,231
Fixed-rate and prepayment sensitive assets and LIBOR- indexed repurchase agreements [Member] \| Net (Loss) Gain on Investments [Member]
Derivative Instruments Gain Loss [Line Items]
Net gains on derivative financial instruments used as economic hedges	(24)	64,931
Interest rate lock commitments and loans acquired for sale at fair value [Member] \| Gain Loss on loans acquired for sale [Member]
Derivative Instruments Gain Loss [Line Items]
Net gains on derivative financial instruments used as economic hedges	297,476	(140,368)
Mortgage service rights [Member] \| Net Loan Servicing fees [Member]
Derivative Instruments Gain Loss [Line Items]
Net gains on derivative financial instruments used as economic hedges	(374,403)	767,186
CRT Derivatives [Member] \| Net (Loss) Gain on Investments [Member]
Derivative Instruments Gain Loss [Line Items]
Net gains on derivative financial instruments used as economic hedges	$ 36,370	$ (215,125)

Derivative and Credit Risk T_10

Derivative and Credit Risk Transfer Strip Assets and Liabilities - Summary of Holdings of CRT Strips (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Credit risk transfer strips contractually restricted from sale
CRT strips, Liabilities	$ 109,570	$ 202,792
Credit Risk Transfer Strips [Member]
Credit risk transfer strips contractually restricted from sale
CRT strips, Liabilities	109,570	202,792
Credit Risk Transfer Strips [Member] \| Through December 4, 2020 [Member]
Credit risk transfer strips contractually restricted from sale
CRT strips, Liabilities	26,910	168,539
Credit Risk Transfer Strips [Member] \| To Maturity [Member]
Credit risk transfer strips contractually restricted from sale
CRT strips, Liabilities	$ 82,660	$ 34,253

Mortgage Servicing Rights - Sum

Mortgage Servicing Rights - Summary of MSRs Carried at Fair Value (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items]
Balance at beginning of quarter		$ 1,755,236	$ 1,535,705
MSRs resulting from loan sales		407,696	248,822
Due to changes in valuation inputs used in valuation model	[1]	337,667	(563,247)
Other changes in fair value	[2]	(59,385)	(63,954)
Change in fair value, Total		278,282	(627,201)
Balance at end of quarter		2,441,214	$ 1,157,326
Pledged Assets [Member]
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items]
Fair value of mortgage servicing rights pledged to secure Assets sold under agreements to repurchase and Notes payable secured by credit risk transfer and mortgage servicing assets		$ 2,423,063		$ 1,742,905

[1]	Primarily reflects changes in pricing spread (discount rate), prepayment speed, and servicing cost inputs.
[2]	Represents changes due to realization of expected cash flows.

Mortgage Servicing Rights - S_2

Mortgage Servicing Rights - Summary of Net Loan Servicing Fees Relating to MSRs (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Transfers And Servicing [Abstract]
Contractually-specified servicing fees	$ 116,287	$ 94,469
Late charges	412	500
Other	15,833	6,691
Net mortgage loan servicing fees	$ 132,532	$ 101,660

Assets Sold Under Agreements to

Assets Sold Under Agreements to Repurchase - Summary of Financial Information Relating to Assets Sold under Agreements to Repurchase (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Assets Sold under Agreements to Repurchase [Line Items]
Weighted average interest rate	1.60%		2.31%
Average balance	$ 5,971,290,000		$ 6,302,900,000
Total interest expense	28,659,000		37,750,000
Maximum daily amount outstanding	7,208,807,000		$ 8,664,587,000
Unpaid principal balance	6,098,299,000	$ 6,317,928,000
Assets sold under agreements to repurchase, At year end	$ 6,091,973,000	$ 6,309,418,000
Weighted average interest rate	1.65%	1.36%
Available borrowing capacity, Committed	$ 240,290,000	$ 483,767,000
Available borrowing capacity, Uncommitted	3,416,352,000	4,151,905,000
Available borrowing capacity	3,656,642,000	4,635,672,000
Margin deposits placed with counterparties included in Other assets	13,966,000	141,808,000
Assets Sold Under Agreements to Repurchase [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Unamortized debt issuance costs	(6,326,000)	(8,510,000)
Mortgage Backed Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets securing agreements to repurchase	1,916,485,000	2,213,922,000
Loans Acquired For Sale At Fair Value [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets securing agreements to repurchase	4,519,274,000	3,484,202,000
Loans at Fair Value [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets securing agreements to repurchase	1,383,000	3,703,000
Real estate acquired in settlement of loans [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets securing agreements to repurchase	10,250,000	15,365,000
Mortgage service rights [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets securing agreements to repurchase	1,537,749,000	1,166,090,000
Deposits securing CRT Agreements [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets securing agreements to repurchase	$ 0	$ 2,799,263,000

Assets Sold Under Agreements _2

Assets Sold Under Agreements to Repurchase - Summary of Financial Information Relating to Assets Sold under Agreements to Repurchase (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Assets Sold under Agreements to Repurchase [Line Items]
Amortization of debt issuance costs	$ 7,384	$ 3,127
Assets Sold Under Agreements to Repurchase [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amortization of debt issuance costs	$ 5,200	$ 1,400

Assets Sold Under Agreements _3

Assets Sold Under Agreements to Repurchase - Summary of Maturities of Outstanding Advances Under Repurchase Agreements by Maturity Date (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)
Assets Sold under Agreements to Repurchase [Line Items]
Maturity of repurchase agreements	$ 6,098,299
Weighted average maturity (in months)	1 month 27 days
Within 30 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Maturity of repurchase agreements	$ 1,879,732
Over 30 to 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Maturity of repurchase agreements	3,468,259
Over 90 days to 180 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Maturity of repurchase agreements	$ 750,308

Assets Sold Under Agreements _4

Assets Sold Under Agreements to Repurchase - Summary of Assets Sold under Agreements to Repurchase by Counterparty (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)
Credit Suisse First Boston Mortgage Capital LLC Maturity in 2020 [Member] \| Mortgage loans acquired for sale, mortgage loans, REO and MSRs sold under agreements to repurchase [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 75,611
Mortgage acquired for sale Weighted-average repurchase agreement maturity	Apr. 23, 2021
Facility maturity	Apr. 23, 2021
Citibank, N.A. [Member] \| Mortgage loans acquired for sale, mortgage loans, REO and MSRs sold under agreements to repurchase [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 10,807
Mortgage acquired for sale Weighted-average repurchase agreement maturity	May 22, 2021
Facility maturity	Aug. 3, 2021
RBC Capital Markets L.P. [Member] \| Mortgage loans acquired for sale, mortgage loans, REO and MSRs sold under agreements to repurchase [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 32,331
Mortgage acquired for sale Weighted-average repurchase agreement maturity	Jul. 15, 2021
Facility maturity	Nov. 10, 2021
Morgan Stanley And Company. LLC [Member] \| Mortgage loans acquired for sale, mortgage loans, REO and MSRs sold under agreements to repurchase [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 18,714
Mortgage acquired for sale Weighted-average repurchase agreement maturity	Jun. 21, 2021
Facility maturity	Nov. 2, 2022
Bank of America, N.A. [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 10,793
Weighted average maturity	Apr. 14, 2021
Bank of America, N.A. [Member] \| Mortgage loans acquired for sale, mortgage loans, REO and MSRs sold under agreements to repurchase [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 119,373
Mortgage acquired for sale Weighted-average repurchase agreement maturity	May 3, 2021
Facility maturity	Jun. 9, 2021
Barclays Capital Inc. [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 8,732
Weighted average maturity	Apr. 15, 2021
Barclays Capital Inc. [Member] \| Mortgage loans acquired for sale, mortgage loans, REO and MSRs sold under agreements to repurchase [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 18,223
Mortgage acquired for sale Weighted-average repurchase agreement maturity	Jun. 3, 2021
Facility maturity	Nov. 3, 2022
JPMorgan Chase & Co. [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 17,117
Weighted average maturity	Apr. 8, 2021
JPMorgan Chase & Co. [Member] \| Mortgage loans acquired for sale, mortgage loans, REO and MSRs sold under agreements to repurchase [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 13,559
Mortgage acquired for sale Weighted-average repurchase agreement maturity	Apr. 7, 2021
Facility maturity	Apr. 7, 2021
Goldman Sachs & Co. LLC [Member] \| Mortgage loans acquired for sale, mortgage loans, REO and MSRs sold under agreements to repurchase [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 9,460
Mortgage acquired for sale Weighted-average repurchase agreement maturity	Jun. 21, 2021
Facility maturity	Dec. 23, 2022
BNP Paribas [Member] \| Mortgage loans acquired for sale, mortgage loans, REO and MSRs sold under agreements to repurchase [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 7,646
Mortgage acquired for sale Weighted-average repurchase agreement maturity	Jun. 13, 2021
Facility maturity	Jul. 30, 2021
Wells Fargo Securities, LLC [Member] \| Mortgage loans acquired for sale, mortgage loans, REO and MSRs sold under agreements to repurchase [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 5,141
Mortgage acquired for sale Weighted-average repurchase agreement maturity	Jun. 21, 2021
Facility maturity	Oct. 6, 2022
Daiwa Capital Markets America Inc. [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 14,961
Weighted average maturity	Apr. 16, 2021
Amherst Pierpont Securities LLC [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 4,488
Weighted average maturity	Apr. 16, 2021

Mortgage Loan Participation P_2

Mortgage Loan Participation Purchase and Sale Agreements - Summary of Mortgage Loan Participation Purchase and Sale Agreements (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
At period end:
Mortgage loan participation purchase and sale agreements, At year end	$ 68,176		$ 16,851
Mortgage Loan Participation Purchase and Sale Agreement [Member]
Mortgage Loan Participation Purchase And Sale Agreement [Line Items]
Weighted average interest rate	1.38%	2.73%
Average balance	$ 39,162	$ 41,301
Total interest expense	164	338
Maximum daily amount outstanding	82,571	94,387
At period end:
Amount outstanding	68,176	16,851
Unamortized debt issuance costs	0	0
Mortgage loan participation purchase and sale agreements, At year end	$ 68,176	$ 16,851
Weighted average interest rate	1.36%	1.39%
Loans acquired for sale pledged to secure mortgage loan participation purchase and sale agreements	$ 70,919	$ 17,645

Mortgage Loan Participation P_3

Mortgage Loan Participation Purchase and Sale Agreements - Summary of Mortgage Loan Participation Purchase and Sale Agreements (Parenthetical) (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Mortgage Loan Participation Purchase And Sale Agreement [Line Items]
Amortization of debt issuance costs	$ 7,384,000	$ 3,127,000
Mortgage Loan Participation Purchase and Sale Agreement [Member]
Mortgage Loan Participation Purchase And Sale Agreement [Line Items]
Amortization of debt issuance costs	$ 31,000	$ 57,000

Long-Term Debt - Summary of Ter

Long-Term Debt - Summary of Term Note Issued to Qualified Institutional Buyers (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)
Short-term Debt [Line Items]
Unpaid principal balance	$ 2,008,787
March 4, 2021 [Member] \| Secured Debt
Short-term Debt [Line Items]
Notes Issued	659,156
Unpaid principal balance	$ 657,070
Interest rate spread (Annual)	2.90%
Maturity date, Stated	Feb. 28, 2024
December 22, 2020 [Member] \| Secured Debt
Short-term Debt [Line Items]
Notes Issued	$ 500,000
Unpaid principal balance	$ 496,909
Interest rate spread (Annual)	3.81%
Maturity date, Stated	Dec. 28, 2022
Febuary 14 2019 [Member] \| Secured Debt
Short-term Debt [Line Items]
Notes Issued	$ 350,000
Unpaid principal balance	$ 156,016
Interest rate spread (Annual)	2.35%
Maturity date, Stated	Mar. 1, 2023
Maturity date, Optional extension	Feb. 27, 2025
October 16, 2019 [Member] \| Secured Debt
Short-term Debt [Line Items]
Notes Issued	$ 375,000
Unpaid principal balance	$ 151,523
Interest rate spread (Annual)	2.70%
Maturity date, Stated	Oct. 27, 2022
Maturity date, Optional extension	Oct. 29, 2024
June 11, 2019 [Member] \| Secured Debt
Short-term Debt [Line Items]
Notes Issued	$ 638,000
Unpaid principal balance	$ 408,000
Interest rate spread (Annual)	2.75%
Maturity date, Stated	May 29, 2023
Maturity date, Optional extension	May 29, 2025
March 29, 2019 [Member]
Short-term Debt [Line Items]
Unpaid principal balance	$ 139,269

Long-Term Debt - Additional Inf

Long-Term Debt - Additional Information (Detail)	Mar. 30, 2021USD ($)	Mar. 09, 2021USD ($)	Aug. 04, 2020USD ($)	Nov. 04, 2019USD ($)	Apr. 25, 2018USD ($)	Mar. 31, 2021USD ($)
Secured Term Notes [Member]
Short-term Debt [Line Items]
Notes Issued	$ 350,000				$ 450,000,000
Aggregate loan amount	$ 350,000				$ 450,000,000
Maturity date of debt instrument					Apr. 25, 2023
Debt instrument extended maturity date subject to term note indenture					Apr. 25, 2025
Loan And Security Agreement With Citibank [Member] \| Maximum [Member]
Short-term Debt [Line Items]
Notes Issued						$ 700,000
Aggregate loan amount						700,000
Loan And Security Agreement With Citibank [Member] \| Minimum [Member]
Short-term Debt [Line Items]
Notes Issued						175,000
Aggregate loan amount						175,000
Exchangeable Senior Notes due March 15, 2026 [Member]
Short-term Debt [Line Items]
Maturity date of debt instrument		Mar. 15, 2026
Issuance of debt through private offering		$ 345,000,000
Percentage of interest on debt		5.50%
Principal amount of the exchangeable notes		$ 1,000
Exchangeable Senior Notes due November 1, 2024 [Member]
Short-term Debt [Line Items]
Maturity date of debt instrument				Nov. 1, 2024
Issuance of debt through private offering				$ 210,000,000		$ 555,000,000
Percentage of interest on debt				5.50%
Principal amount of the exchangeable notes				$ 1,000
Fixed-rate and prepayments sensitive assets and LIBOR- indexed repurchase agreements [Member] \| Secured Term Notes [Member]
Short-term Debt [Line Items]
Debt Instrument, Description of Variable Rate Basis	0					one-month
Debt instrument interest rate spread	3.00%				2.35%
Initial Exchangeable Rate [Member] \| Exchangeable Senior Notes due March 15, 2026 [Member]
Short-term Debt [Line Items]
Number of shares exchanged per exchangeable notes		46.1063
Initial Exchangeable Rate [Member] \| Exchangeable Senior Notes due November 1, 2024 [Member]
Short-term Debt [Line Items]
Number of shares exchanged per exchangeable notes				40.101
PennyMac Loan Services, LLC [Member]
Short-term Debt [Line Items]
Line of credit, maximum borrowing capacity			$ 700,000,000
Extended termination date of debt instrument			Aug. 3, 2021

Long-Term Debt - Summary of Fin

Long-Term Debt - Summary of Financial Information Relating to Note Payable (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Mar. 31, 2027	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022	Mar. 03, 2021
Carrying value:
Amount outstanding	$ 2,908,788		$ 1,930,018
Balance	2,897,794		1,924,999	$ 0	$ 350,000	$ 0	$ 1,515,071	$ 804,448	$ 139,269	$ 2,808,788
Assets securing notes payable:
MSRs	2,423,063		1,742,905
Deposits securing CRT arrangements	2,664,420		2,799,263
Derivative assets	$ 58,134		58,699
Notes Payable [Member]
Short-term Debt [Line Items]
Weighted-average interest rate	3.14%	4.10%
Average balance	$ 2,260,721	$ 1,860,213
Total interest expense	18,599	19,618
Maximum daily amount outstanding	3,180,115	$ 2,032,665
Carrying value:
Unamortized debt issuance costs	$ (10,994)		$ (5,019)
Weighted average interest rate	2.93%		2.99%
Assets securing notes payable:
Derivative assets	$ 58,134		$ 58,699

Long-Term Debt - Summary of F_2

Long-Term Debt - Summary of Financial Information Relating to Note Payable (Parenthetical) (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Short-term Debt [Line Items]
Amortization of debt issuance costs	$ 7,384,000	$ 3,127,000
Notes Payable [Member]
Short-term Debt [Line Items]
Amortization of debt issuance costs	$ 1.1	$ 609,000

Long-Term Debt - Summary of F_3

Long-Term Debt - Summary of Financial Information Relating to Exchangeable Senior Notes (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2027	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022	Mar. 03, 2021	Dec. 31, 2020
Carrying value:
UPB	$ 555,000									$ 210,000
Exchangeable senior notes	494,097		$ 0	$ 345,000	$ 210,000	$ 0	$ 0	$ 0	$ 555,000	196,796
Convertible Debt [Member]
Carrying value:
Unamortized debt issuance costs and conversion option	(60,903)									$ (13,204)
Convertible Debt [Member] \| Nonaffiliates [Member]
Short-term Debt [Line Items]
Average balance	298,554	$ 460,000
Total interest expense	$ 5,542	$ 7,266

Long-Term Debt - Summary of F_4

Long-Term Debt - Summary of Financial Information Relating to Asset-Backed Financing of a VIE at Fair Value (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2027	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022	Mar. 03, 2021	Dec. 31, 2020
Short-term Debt [Line Items]
Asset-backed financing of a variable interest entity at fair value	$ 101,238		$ 100,036	$ 0	$ 0	$ 0	$ 0	$ 0	$ 100,036	$ 134,726
Variable Interest Entities [Member]
Short-term Debt [Line Items]
Asset-backed financing of a variable interest entity at fair value	101,238									134,726
Asset-Backed Financing of the VIE at Fair Value [Member] \| Variable Interest Entities [Member]
Short-term Debt [Line Items]
Asset-backed financing of a variable interest entity at fair value	101,238									134,726
UPB	100,036									$ 131,835
Asset-Backed Financing of the VIE at Fair Value [Member] \| Variable Interest Entities [Member] \| Asset Backed Secured Financing Liability Fair Value [Member]
Short-term Debt [Line Items]
Average balance	120,415	$ 240,765
Total interest expense	$ 168	$ 4,527
Weighted average interest rate	3.22%	3.39%
Weighted average interest rate	3.57%									3.56%

Long-Term Debt - Schedule of An

Long-Term Debt - Schedule of Annual Maturities on Long Term Debt Obligations (Detail) - USD ($) $ in Thousands	Mar. 31, 2027	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021	Mar. 03, 2021	Dec. 31, 2020
Debt Disclosure [Abstract]
Notes payable secured by credit risk transfer and mortgage servicing assets	$ 0	$ 350,000	$ 0	$ 1,515,071	$ 804,448	$ 139,269	$ 2,897,794	$ 2,808,788	$ 1,924,999
Exchangeable senior notes	0	345,000	210,000	0	0	0	494,097	555,000	196,796
Asset-backed financing of a variable interest entity at fair value	100,036	0	0	0	0	0	101,238	100,036	134,726
Interest-only security payable at fair value	18,922	0	0	0	0	0	$ 18,922	18,922	$ 10,757
Total	$ 118,958	$ 695,000	$ 210,000	$ 1,515,071	$ 804,448	$ 139,269		$ 3,482,746

Liability for Losses under Re_3

Liability for Losses under Representations and Warranties - Summary of Company's Liability for Losses under Representations and Warranties (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Mortgage Banking [Abstract]
Balance, beginning of quarter	$ 21,893	$ 7,614
Provision for losses:
Pursuant to loan sales	8,513	1,030
Reduction in liability due to change in estimate	(1,424)	(1,344)
Losses incurred, net	(15)	0
Balance, end of quarter	28,967	7,300
UPB of loans subject to representations and warranties at end of quarter	$ 177,595,762	$ 131,049,135

Commitments and Contingencies -

Commitments and Contingencies - Company's Outstanding Contractual Commitments (Detail) $ in Thousands	Mar. 31, 2021USD ($)
Commitments to purchase mortgage loans:
Commitments to purchase loans acquired for sale	$ 8,525,688

Shareholders' Equity - Summary

Shareholders' Equity - Summary of Preferred Shares of Beneficial Interest (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Class Of Stock [Line Items]
Number of shares	12,400,000		12,400,000
Liquidation preference	$ 310,000		$ 310,000
Issuance discount	10,293
Carrying value	$ 299,707		$ 299,707
8.125% Series A Preferred Stock [Member]
Class Of Stock [Line Items]
Number of shares	4,600,000
Liquidation preference	$ 115,000
Issuance discount	3,828
Carrying value	$ 111,172
Dividends per share	$ 0.51	$ 0.51
8.00% Series B Preferred Stock [Member]
Class Of Stock [Line Items]
Number of shares	7,800,000
Liquidation preference	$ 195,000
Issuance discount	6,465
Carrying value	$ 188,535
Dividends per share	$ 0.50	$ 0.50

Shareholders' Equity - Summar_2

Shareholders' Equity - Summary of Preferred Shares of Beneficial Interest (Parenthetical) (Detail) - $ / shares	1 Months Ended	3 Months Ended
	Jul. 31, 2017	Mar. 31, 2021	Mar. 31, 2017	Dec. 31, 2020
Class Of Stock [Line Items]
Preferred stock, par value		$ 0.01		$ 0.01
8.125% Series A Preferred Stock [Member]
Class Of Stock [Line Items]
Cumulative dividend, beneficial interest rate		8.125%	8.125%
Sale of Stock, Transaction Date		Mar. 31, 2017
Preferred stock, par value		$ 0.01
8.00% Series B Preferred Stock [Member]
Class Of Stock [Line Items]
Cumulative dividend, beneficial interest rate	5.99%	8.00%
Sale of Stock, Transaction Date		Jul. 31, 2017
Preferred stock, par value		$ 0.01

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended
	Jul. 31, 2017	Mar. 31, 2021	Mar. 31, 2017	Mar. 31, 2019	Aug. 31, 2015
Maximum [Member]
Schedule Of Capitalization Equity [Line Items]
Common stock shares Repurchase authorized amount					$ 300,000,000
Equity Distribution Agreement [Member]
Schedule Of Capitalization Equity [Line Items]
Maximum aggregate offering price				$ 200,000,000
Common stock shares available for issuance value		$ 74,400,000
8.125% Series A Preferred Stock [Member]
Schedule Of Capitalization Equity [Line Items]
Cumulative dividend, beneficial interest rate		8.125%	8.125%
8.125% Series A Preferred Stock [Member] \| Fixed Annuity \| Date Of Original Issuance To March 14, 2024 [Member]
Schedule Of Capitalization Equity [Line Items]
Preferred stock, liquidation preference			$ 25
8.125% Series A Preferred Stock [Member] \| Floating Rate [Member] \| March 15, 2024 and Thereafter [Member]
Schedule Of Capitalization Equity [Line Items]
Cumulative dividend, beneficial interest rate			5.831%
8.00% Series B Preferred Stock [Member]
Schedule Of Capitalization Equity [Line Items]
Cumulative dividend, beneficial interest rate	5.99%	8.00%
Preferred stock, liquidation preference	$ 25
8.125% Series A And 8.00% Series B Preferred Stock [Member]
Schedule Of Capitalization Equity [Line Items]
Preferred stock redemption price per share		$ 25

Shareholders' Equity - Summar_3

Shareholders' Equity - Summary of Activities under ATM Equity Offering Program (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Class Of Stock [Line Items]
Net proceeds	$ 0	$ 5,654
Common Shares [Member]
Class Of Stock [Line Items]
Number of common shares issued		241
Equity Distribution Agreement [Member]
Class Of Stock [Line Items]
Gross proceeds		$ 5,654
Net proceeds		$ 5,597
Equity Distribution Agreement [Member] \| Common Shares [Member]
Class Of Stock [Line Items]
Number of common shares issued		241

Shareholders' Equity - Summar_4

Shareholders' Equity - Summary of Share Repurchase Activity (Detail) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020USD ($)shares
Equity [Abstract]
Common shares repurchased \| shares	783
Cumulative shares repurchased \| shares	17,498
Cost of common shares repurchased \| $	$ 5,783
Cumulative cost of shares repurchased \| $	$ 253,892

Net Gains on Loans Acquired f_3

Net Gains on Loans Acquired for Sale - Summary of Net Gains on Mortgage Loans Acquired for Sale (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Provision for losses relating to representations and warranties provided in mortgage loan sales:
Pursuant to loans sales	$ (8,513)	$ (1,030)
Change in fair value of loans and derivatives held at end of quarter:
Net cash of gain on mortgage loans acquired for sale	180,787	136,946
Net gain on loans acquired for sale	53,012	48,775
PennyMac Financial Services, Inc. [Member]
Change in fair value of loans and derivatives held at end of quarter:
Net gain on loans acquired for sale	1,738	4,161
Nonaffiliates [Member]
Cash loss:
Loans	(592,789)	(68,954)
Hedging activities	463,276	(23,378)
Cash gain, net of effects of cash hedging, on sale of mortgage loans acquired for sale	(129,513)	(92,332)
Non-cash gain:
Recognition of fair value of firm commitment to purchase CRT securities	0	(26,649)
Receipt of MSRs in mortgage loan sale transactions	407,696	248,822
Provision for losses relating to representations and warranties provided in mortgage loan sales:
Pursuant to loans sales	(8,513)	(1,030)
Reduction of liability due to change in estimate	1,424	1,344
Provision for losses relating to representations and warranties	(7,089)	314
Change in fair value of loans and derivatives held at end of quarter:
IRLCs	(137,243)	68,231
Loans	83,223	(36,782)
Hedging derivatives	(165,800)	(116,990)
Total non cash portion of gain on mortgage loans acquired for sale	(219,820)	(85,541)
Net gain on loans acquired for sale	$ 51,274	$ 44,614

Net Gains (Losses) on Investm_3

Net Gains (Losses) on Investments - Summary of Net Gains (Losses) on Investments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Loans at fair value	$ 180,787	$ 136,946
Net gains (losses) on investments	83,191	(815,131)
Nonaffiliates [Member]
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Investment securities at fair value, Mortgage-backed securities	(71,117)	115,967
CRT arrangements	154,031	(487,292)
Firm commitment to purchase CRT securities	0	(492,513)
Asset-backed financing of a VIE at fair value	900	1,928
Hedging derivatives	(24)	64,931
Net gains (losses) on investments	81,540	(800,990)
PennyMac Financial Services, Inc. [Member]
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Net gains (losses) on investments	1,651	(14,141)
Variable Interest Entities [Member] \| Nonaffiliates [Member]
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Loans at fair value	(2,345)	(2,869)
Distressed [Member] \| Nonaffiliates [Member]
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Loans at fair value	$ 95	$ (1,142)

Net Interest Income (Expense) -

Net Interest Income (Expense) - Summary of Net Interest Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Interest income:
Interest income	$ 37,589	$ 72,123
Interest expense:
Assets sold under agreements to repurchase	28,659	37,750
Interest expense, total	76,308	81,068
Net interest expense	(38,719)	(8,945)
PennyMac Financial Services, Inc. [Member]
Interest income:
Interest income	1,280	1,974
Interest expense:
Assets sold under agreements to repurchase	387	1,218
Nonaffiliates [Member]
Interest income:
Cash and short-term investments	225	1,627
Mortgage-backed securities	8,286	15,568
Loans acquired for sale at fair value	22,908	31,523
Distressed	253	59
Deposits securing CRT arrangements	168	6,099
Placement fees relating to custodial funds	2,532	12,398
Other	38	234
Interest income	36,309	70,149
Interest expense:
Assets sold under agreements to repurchase	28,659	37,750
Mortgage loan participation purchase and sale agreements	164	338
Notes payable secured by credit risk transfer and mortgage servicing assets	18,599	19,618
Asset-backed financings of a VIE at fair value	168	4,527
Interest shortfall on repayments of loans serviced for Agency securitizations	22,040	9,439
Interest on loan impound deposits	749	912
Interest expense, total	75,921	79,850
Nonaffiliates [Member] \| Exchangeable Notes [Member]
Interest expense:
Total interest expense	5,542	7,266
Nonaffiliates [Member] \| Variable Interest Entities [Member]
Interest income:
Loans at fair value	$ 1,899	$ 2,641

Share-Based Compensation - Addi

Share-Based Compensation - Additional Information (Detail)	3 Months Ended
Share-Based Compensation - Additional Information (Detail)	Mar. 31, 2021
Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of Company's issued and outstanding shares	8.00%
Maximum [Member] \| Restricted Share Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	3 years
Minimum [Member] \| Restricted Share Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	1 year

Share-Based Compensation - Summ

Share-Based Compensation - Summary of Share-Based Compensation Activity (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total share units granted	185	204
Total grant date value of share units	$ 3,519	$ 4,406
Total share units vested	137	266
Total share units forfeited	0	0
Compensation expense relating to share-based grants	$ 1,738	$ 186
Restricted Shares Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total share units granted	101	92
Total grant date value of share units	$ 1,917	$ 1,978
Total share units vested	100	123
Total share units forfeited	0	0
Performance Shares Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total share units granted	84	112
Total grant date value of share units	$ 1,602	$ 2,428
Total share units vested	37	143
Total share units forfeited	0	0

Share-Based Compensation - Su_2

Share-Based Compensation - Summary of Share-Based Compensation Activity (Parenthetical) (Detail) - Performance Shares Units [Member]	3 Months Ended
	Mar. 31, 2021shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share vested due to exceeding performance goal	37,000
Vesting percentage	100.00%

Share-Based Compensation - Su_3

Share-Based Compensation - Summary of Restricted Share Units and Performance Share Units Expected to Vest (Detail) shares in Thousands	Mar. 31, 2021$ / sharesshares
Restricted Share Units [Member]
Shares expected to vest:
Number of units (in thousands) \| shares	190
Grant date average fair value per unit \| $ / shares	$ 20.07
Performance Share Units [Member]
Shares expected to vest:
Number of units (in thousands) \| shares	251
Grant date average fair value per unit \| $ / shares	$ 19.26

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended
Income Taxes - Additional Information (Detail) - USD ($)	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Income Tax [Line Items]
Effective income tax rates	21.30%
Income (loss) before benefit from income taxes	$ 91,028,000	$ (584,425,000)
Expense (benefit) from income taxes	$ 19,425,000	10,248,000
Percentage of deduction from taxable income	20.00%
Taxable REIT Subsidiary [Member]
Income Tax [Line Items]
Income (loss) before benefit from income taxes		(21,800,000)
Expense (benefit) from income taxes		$ 10,100,000
Net deferred tax assets	$ 0		$ 110,000

Earnings Per Share - Summary of

Earnings Per Share - Summary of Basic and Diluted Earnings per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net income (loss)	$ 71,603	$ (594,673)
Dividends on preferred shares	(6,234)	(6,234)
Effect of participating securities—share-based compensation awards	(120)	(50)
Net income (loss) attributable to common shareholders	$ 65,249	$ (600,957)
Weighted average basic shares outstanding	97,892	100,245
Dilutive securities-shares issuable under share-based compensation plan	211	0
Diluted weighted average number of shares outstanding	98,103	100,245
Basic earnings (loss) per share	$ 0.67	$ (5.99)
Diluted earnings (loss) per share	$ 0.67	$ (5.99)

Earnings Per Share - Summary _2

Earnings Per Share - Summary of Potentially Dilutive Shares Excluded from Computation of Diluted Earnings Per Share (Detail) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Share-based Compensation Plan [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potentially dilutive stock excluded from the diluted earnings per share	11	135
Shares Issuable Pursuant to Exchange of 2020 Notes [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potentially dilutive stock excluded from the diluted earnings per share	0	8,467

Segments - Additional Informati

Segments - Additional Information (Detail)	3 Months Ended
Segments - Additional Information (Detail)	Mar. 31, 2021Segment
Segment Reporting [Abstract]
Number of business segments	4

Segments - Financial Highlights

Segments - Financial Highlights by Operating Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Net investment income:
Net (loss) gain on loans acquired for sale	$ 53,012	$ 48,775
Net gain (loss) on investments	83,191	(815,131)
Net loan servicing fees	50,045	244,572
Net interest expense:
Interest income	37,589	72,123
Interest expense	76,308	81,068
Net interest expense	(38,719)	(8,945)
Other	53,868	24,212
Net investment income (loss)	201,397	(506,517)
Expenses:
Loan fulfillment and servicing fees payable to PFSI	79,928	56,461
Management fees	8,449	9,055
Other	21,992	12,392
Total expenses	110,369	77,908
Pretax (loss) income	91,028	(584,425)
Total assets at quarter end	12,522,254	11,918,488	$ 11,492,011
Credit Sensitive Strategies [Member]
Net investment income:
Net (loss) gain on loans acquired for sale	(1)	(32,306)
Net gain (loss) on investments	154,271	(919,109)
Net loan servicing fees	0	0
Net interest expense:
Interest income	650	6,556
Interest expense	17,261	14,566
Net interest expense	(16,611)	(8,010)
Other	888	166
Net investment income (loss)	138,547	(959,259)
Expenses:
Loan fulfillment and servicing fees payable to PFSI	137	301
Management fees	0	0
Other	4,150	911
Total expenses	4,287	1,212
Pretax (loss) income	134,260	(960,471)
Total assets at quarter end	2,772,111	1,947,153
Interest Rate Sensitive Strategies [Member]
Net investment income:
Net (loss) gain on loans acquired for sale	0	0
Net gain (loss) on investments	(71,080)	103,978
Net loan servicing fees	50,045	244,572
Net interest expense:
Interest income	13,516	33,241
Interest expense	37,316	41,608
Net interest expense	(23,800)	(8,367)
Other	0	0
Net investment income (loss)	(44,835)	340,183
Expenses:
Loan fulfillment and servicing fees payable to PFSI	18,955	14,220
Management fees	0	0
Other	812	1,182
Total expenses	19,767	15,402
Pretax (loss) income	(64,602)	324,781
Total assets at quarter end	4,739,849	5,664,991
Correspondent production [Member]
Net investment income:
Net (loss) gain on loans acquired for sale	53,013	81,081
Net gain (loss) on investments	0	0
Net loan servicing fees	0	0
Net interest expense:
Interest income	22,797	31,407
Interest expense	21,731	24,309
Net interest expense	1,066	7,098
Other	52,980	23,988
Net investment income (loss)	107,059	112,167
Expenses:
Loan fulfillment and servicing fees payable to PFSI	60,836	41,940
Management fees	0	0
Other	10,646	4,918
Total expenses	71,482	46,858
Pretax (loss) income	35,577	65,309
Total assets at quarter end	4,796,564	3,068,163
Corporate [Member]
Net investment income:
Net (loss) gain on loans acquired for sale	0	0
Net gain (loss) on investments	0	0
Net loan servicing fees	0	0
Net interest expense:
Interest income	626	919
Interest expense	0	585
Net interest expense	626	334
Other	0	58
Net investment income (loss)	626	392
Expenses:
Loan fulfillment and servicing fees payable to PFSI	0	0
Management fees	8,449	9,055
Other	6,384	5,381
Total expenses	14,833	14,436
Pretax (loss) income	(14,207)	(14,044)
Total assets at quarter end	$ 213,730	$ 1,238,181

Supplemental Cash Flow Inform_3

Supplemental Cash Flow Information - Summary of Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Payments:
Income taxes, net	$ 494	$ 0
Interest	91,611	104,757
Non-cash investing activities:
Transfer of loans and advances to real estate acquired in settlement of loans	280	1,166
Receipt of mortgage servicing rights as proceeds from sales of loans at fair value	407,696	248,822
Receipt of excess servicing spread pursuant to recapture agreement with PennyMac Financial Services, Inc.	557	379
Non-cash financing activities:
Dividends declared, not paid	$ 46,109	$ 25,009

Regulatory Capital and Liquid_3

Regulatory Capital and Liquidity Requirements - Additional Information (Detail) - USD ($)	Mar. 31, 2021	Jul. 01, 2020
Minimum [Member]
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]
Basis point	6.00%
Fannie Mae Or Freddie Mac Mortgage Loans [Member]
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]
Minimum net worth amount	$ 2,500,000
Basis point	0.25%	2.00%
Unpaid Principal Balance [Member] \| Fannie Mae Or Freddie Mac Mortgage Loans [Member]
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]
Liquidity requirement basis point		0.035%
Nonperforming mortgage loans [Member] \| Fannie Mae Or Freddie Mac Mortgage Loans [Member]
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]
Basis point		70.00%
Nonperforming mortgage loans [Member] \| Fannie Mae Or Freddie Mac Mortgage Loans [Member] \| Minimum [Member]
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]
Basis point		6.00%

Regulatory Capital and Liquid_4

Regulatory Capital and Liquidity Requirements - Summary of Capital and Liquidity Amounts and Requirements by Agencies (Detail) - Fannie Mae and Freddie Mac [Member] $ in Thousands	Mar. 31, 2021USD ($)	Dec. 31, 2020USD ($)
Capital Requirements By Agencies [Line Items]
Net Worth, Actual	$ 1,170,013	$ 1,101,318
Net Worth, Required	$ 473,294	$ 438,530
Tangible Net Worth / Total Assets Ratio, Actual	0.14	0.16
Tangible Net Worth / Total Assets Ratio, Required	0.06	0.06
Liquidity, Actual	$ 155,419	$ 101,116
Liquidity, Required	$ 63,664	$ 59,158