PennyMac Mortgage Investment Trust (PMT) 10-K 21 Feb 20 2019 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2019	Feb. 20, 2020	Jun. 28, 2019
Document And Entity Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Entity Registrant Name	PennyMac Mortgage Investment Trust
Entity Central Index Key	0001464423
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Interactive Data Current	Yes
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Well-known Seasoned Issuer	Yes
Entity Public Float			$ 1,679,283,823
Entity Common Stock, Shares Outstanding		100,339,851
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
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
Document Annual Report	true
Document Transition Report	false
Documents Incorporated by Reference	Documents Incorporated By Reference Document Parts Into Which Incorporated Definitive Proxy Statement for 2020 Annual Meeting of Shareholders Part III
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
8.125% Series A Preferred Stock [Member]
Document And Entity Information [Line Items]
Title of 12(b) Security	8.125% Series A Fixed-to-Floating Rate Cumulative Redeemable PreferredShares of Beneficial Interest, $0.01 Par Value
Trading Symbol	PMT/PA
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 Fixed-to-Floating Rate Cumulative Redeemable PreferredShares of Beneficial Interest, $0.01 Par Value
Trading Symbol	PMT/PB
Security Exchange Name	NYSE

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
ASSETS
Cash	$ 104,056	$ 59,845
Short-term investments at fair value	90,836	74,850
Mortgage-backed securities at fair value pledged to creditors	2,839,633	2,610,422
Loans acquired for sale at fair value ($4,070,134 and $1,621,879 pledged to creditors, respectively)	4,148,425	1,643,957
Loans at fair value ($268,757 and $399,266 pledged to creditors, respectively)	270,793	408,305
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	178,586	216,110
Derivative and credit risk transfer strip assets ($142,183 and $87,976 pledged to creditors, respectively)	202,318	167,165
Firm commitment to purchase credit risk transfer securities at fair value	109,513	37,994
Real estate acquired in settlement of loans ($40,938 and $40,198 pledged to creditors, respectively)	65,583	85,681
Real estate held for investment ($23,262 pledged to creditors at December 31, 2018)	0	43,110
Deposits securing credit risk transfer arrangements pledged to creditors	1,969,784	1,146,501
Mortgage servicing rights at fair value ($1,510,651 and $1,139,582 pledged to creditors, respectively)	1,535,705	1,162,369
Servicing advances	48,971	67,666
Other	204,388	85,309
Total assets	11,771,351	7,813,361
LIABILITIES
Assets sold under agreements to repurchase	6,648,890	4,777,027
Mortgage loan participation purchase and sale agreements	0	178,639
Notes payable secured by credit risk transfer and mortgage servicing assets	1,696,295	445,573
Exchangeable senior notes	443,506	248,350
Asset-backed financing of a variable interest entity at fair value	243,360	276,499
Interest-only security payable at fair value	25,709	36,011
Derivative liabilities	6,423	5,914
Accounts payable and accrued liabilities	91,149	70,687
Income taxes payable	1,819	36,526
Liability for losses under representations and warranties	7,614	7,514
Total liabilities	9,320,436	6,247,229
Commitments and contingencies ─ Note 20
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, 100,182,227 and 60,951,444 common shares, respectively	1,002	610
Additional paid-in capital	2,127,889	1,285,533
Retained earnings (accumulated deficit)	22,317	(19,718)
Total shareholders’ equity	2,450,915	1,566,132
Total liabilities and shareholders’ equity	11,771,351	7,813,361
Variable Interest Entities [Member]
ASSETS
Loans at fair value ($268,757 and $399,266 pledged to creditors, respectively)	256,367	290,573
Derivative and credit risk transfer strip assets ($142,183 and $87,976 pledged to creditors, respectively)	170,793	123,987
Deposits securing credit risk transfer arrangements pledged to creditors	1,969,784	1,146,501
Other—interest receivable	712	839
Total assets	2,397,656	1,561,900
LIABILITIES
Asset-backed financing of a variable interest entity at fair value	243,360	276,499
Interest-only security payable at fair value	25,709	36,011
Accounts payable and accrued liabilities—interest payable	712	839
Total liabilities	269,781	313,349
PennyMac Financial Services, Inc. [Member]
ASSETS
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	178,586	216,110
Due from PennyMac Financial Services, Inc.	2,760	4,077
LIABILITIES
Assets sold under agreements to repurchase	107,512	131,025
Due to PennyMac Financial Services, Inc.	$ 48,159	$ 33,464

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Loans acquired for sale at fair value, pledged to creditors	$ 4,070,134	$ 1,621,879
Loans at fair value, pledged to creditors	268,757	399,266
Derivative assets, pledged to creditors	142,183	87,976
Real estate pledged to creditors	40,938	40,198
Mortgage servicing rights pledged to creditors	$ 1,510,651	$ 1,139,582
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	100,182,227	60,951,444
Common shares, outstanding	100,182,227	60,951,444
Real Estate Acquired in Satisfaction of Debt [Member]
Real estate pledged to creditors	$ 40,938	$ 40,198
Real Estate Held for Investment [Member]
Real estate pledged to creditors		$ 23,262

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net investment income
Net gain on investments	$ 263,318	$ 81,926	$ 96,384
Net gain on loans acquired for sale	170,164	59,185	74,516
Loan origination fees	87,997	43,321	40,184
Contractually specified	295,390	204,663	164,776
Net mortgage loan servicing fees	319,489	212,725	171,299
Amortization, impairment, and change in fair value of mortgage servicing rights	(383,731)	(94,330)	(103,487)
Net servicing fees from non-affiliates	(58,918)	120,587	69,240
Interest income	317,885	222,772	195,176
Interest expense	297,446	175,171	151,371
Net interest income	20,439	47,601	43,805
Results of real estate acquired in settlement of loans	771	(8,786)	(14,955)
Other	5,044	7,233	8,766
Net investment income	488,815	351,067	317,940
Expenses
Loan fulfillment fees	160,610	81,350	80,359
Loan servicing fees	48,797	42,045	43,064
Management fees	36,492	24,465	22,584
Loan origination	15,105	6,562	7,521
Compensation	6,897	6,781	6,322
Professional services	5,556	6,380	6,905
Safekeeping	5,097	1,805	2,918
Loan collection and liquidation	4,600	7,852	6,063
Other	15,020	15,839	17,658
Total expenses	298,174	193,079	193,394
Income before (benefit from) provision for income taxes	190,641	157,988	124,546
(Benefit from) provision for income taxes	(35,716)	5,190	6,797
Net income	226,357	152,798	117,749
Dividends on preferred shares	24,938	24,938	15,267
Net income attributable to common shareholders	$ 201,419	$ 127,860	$ 102,482
Earnings per common share
Basic	$ 2.54	$ 2.09	$ 1.53
Diluted	$ 2.42	$ 1.99	$ 1.48
Weighted average common shares outstanding
Basic	78,990	60,898	66,144
Diluted	87,711	69,365	74,611
Nonaffiliates [Member]
Net investment income
Net gain on investments	$ 270,848	$ 70,842	$ 110,914
Net gain on loans acquired for sale	155,783	48,260	62,432
Other	24,099	8,062	6,523
Net mortgage loan servicing fees	295,390	204,663	164,776
Amortization, impairment, and change in fair value of mortgage servicing rights	(383,731)	(94,330)	(103,487)
Net servicing fees from non-affiliates	(64,242)	118,395	67,812
Interest income	307,594	207,634	178,225
Interest expense	291,144	167,709	143,333
PennyMac Financial Services, Inc. [Member]
Net investment income
Net gain on investments	(7,530)	11,084	(14,530)
Net gain on loans acquired for sale	14,381	10,925	12,084
From PennyMac Financial Services, Inc.	5,324	2,192	1,428
Interest income	10,291	15,138	16,951
Interest expense	$ 6,302	$ 7,462	$ 8,038

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Preferred Shares [Member]	Common Shares [Member]	Additional Paid-in Capital [Member]	(Accumulated Deficit) Retained Earnings [Member]
Balance, Amount at Dec. 31, 2016	$ 1,351,114		$ 667	$ 1,377,171	$ (26,724)
Balance, Shares at Dec. 31, 2016			66,697
Net income	117,749			0	117,749
Share-based compensation, Amount	4,904		$ 2	4,902	0
Share-based compensation, Shares			284
Dividends:
Common share dividends	(123,625)	$ 0	$ 0	0	(123,625)
Preferred shares dividends	(14,066)	0	0	0	(14,066)
Issuance of shares, Amount	310,000	$ 310,000		0	0
Issuance of shares, Shares		12,400
Issuance costs relating to shares	(10,293)	$ (10,293)		0	0
Repurchase of common shares, Amount	$ (91,198)		$ (56)	(91,142)	0
Repurchase of common shares, Shares	(5,647)		(5,647)
Balance, Amount at Dec. 31, 2017	$ 1,544,585	$ 299,707	$ 613	1,290,931	(46,666)
Balance, Shares at Dec. 31, 2017		12,400	61,334
Balance, Amount | Accounting Standards Update Transfers and Servicing [Member]	14,361	$ 0	$ 0	0	14,361
Balance, Amount | Accounting Standards Update Transfers and Servicing [Member]	1,558,946	299,707	613	1,290,931	(32,305)
Net income	28,186
Balance, Amount at Mar. 31, 2018	1,542,258
Balance, Amount at Dec. 31, 2017	1,544,585	$ 299,707	$ 613	1,290,931	(46,666)
Balance, Shares at Dec. 31, 2017		12,400	61,334
Net income	152,798			0	152,798
Share-based compensation, Amount	5,318		$ 3	5,315	0
Share-based compensation, Shares			288
Dividends:
Common share dividends	(115,267)	$ 0	$ 0	0	(115,267)
Preferred shares dividends	(24,944)	0	0	0	(24,944)
Repurchase of common shares, Amount	$ (10,719)		$ (6)	(10,713)	0
Repurchase of common shares, Shares	(671)		(671)
Balance, Amount at Dec. 31, 2018	$ 1,566,132	$ 299,707	$ 610	1,285,533	(19,718)
Balance, Shares at Dec. 31, 2018		12,400	60,951
Balance, Amount at Mar. 31, 2018	1,542,258
Net income	36,425
Balance, Amount at Jun. 30, 2018	1,545,487
Net income	46,562
Balance, Amount at Sep. 30, 2018	1,558,563
Net income	41,625
Balance, Amount at Dec. 31, 2018	1,566,132	$ 299,707	$ 610	1,285,533	(19,718)
Balance, Shares at Dec. 31, 2018		12,400	60,951
Net income	53,527
Balance, Amount at Mar. 31, 2019	1,727,589
Balance, Amount at Dec. 31, 2018	1,566,132	$ 299,707	$ 610	1,285,533	(19,718)
Balance, Shares at Dec. 31, 2018		12,400	60,951
Net income	226,357			0	226,357
Share-based compensation, Amount	2,930		$ 2	2,928	0
Share-based compensation, Shares			241
Issuance of exchangeable notes with cash conversion option, Amount	10,361		$ 0	10,361	0
Issuance of exchangeable notes with cash conversion option, Shares			0
Dividends:
Common share dividends	(159,378)	$ 0	$ 0	0	(159,378)
Preferred shares dividends	(24,944)	0	0	0	(24,944)
Issuance of shares, Amount	839,682	0	$ 390	839,292	0
Issuance of shares, Shares			38,990
Issuance costs relating to shares	(10,225)	0	$ 0	(10,225)	0
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
Balance, Amount at Mar. 31, 2019	1,727,589
Net income	44,233
Balance, Amount at Jun. 30, 2019	1,943,934
Net income	70,000
Balance, Amount at Sep. 30, 2019	2,219,611
Net income	58,597
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

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
(Accumulated Deficit) Retained Earnings [Member]
Common share dividends declared per share	$ 1.88	$ 1.88	$ 1.88

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities
Net income	$ 226,357	$ 152,798	$ 117,749
Adjustments to reconcile net income to net cash provided by operating activities:
Net gain on investments	(263,318)	(81,926)	(96,384)
Net gain on loans acquired for sale at fair value	(170,164)	(59,185)	(74,516)
Amortization, impairment, and change in fair value of mortgage servicing rights	383,731	94,330	103,487
Accrual of interest on excess servicing spread purchased from PennyMac Financial Services, Inc.	(10,291)	(15,138)	(16,951)
Capitalization of interest and fees on loans at fair value	(2,318)	(7,439)	(30,795)
Amortization of debt issuance costs and (premiums), net	34	(9,323)	13,769
Accrual of unearned discounts and amortization of purchase premiums on mortgage-backed securities, loans at fair value, and asset-backed financing of a VIE	13,574	5,270	5,703
Results of real estate acquired in settlement of loans	(771)	8,786	14,955
Share-based compensation expense	5,530	5,318	4,904
Reversal of contingent underwriting fees	(1,134)	0	0
Purchase of loans acquired for sale at fair value from nonaffiliates	(108,251,144)	(64,671,970)	(65,830,095)
Purchase of loans acquired for sale at fair value from PennyMac Financial Services, Inc.	(6,255,915)	(3,343,028)	(904,097)
Repurchase of loans subject to representation and warranties	(22,478)	(12,208)	(11,412)
Sale to nonaffiliates and repayment of loans acquired for sale at fair value	61,128,081	29,369,656	24,314,165
Sale of loans acquired for sale to PennyMac Financial Services, Inc.	50,110,085	37,967,724	42,624,288
Settlement of repurchase agreement derivatives	19,317	8,964	0
Decrease (increase) in servicing advances	18,772	20,525	(2,353)
Decrease (increase) in due from PennyMac Financial Services, Inc.	1,286	(26)	2,514
Decrease (increase) in other assets	102,215	(23,482)	8,822
Increase (decrease) in accounts payable and accrued liabilities	3,613	6,400	(40,435)
Increase in due to PennyMac Financial Services, Inc.	14,571	6,345	10,656
(Decrease) increase in income taxes payable	(34,707)	3,857	9,151
Net cash (used in) provided by operating activities	(2,985,074)	(573,752)	223,125
Cash flows from investing activities
Net (increase) decrease in short-term investments	(15,986)	(56,452)	103,690
Purchase of mortgage-backed securities at fair value	(1,250,289)	(1,810,877)	(251,872)
Sales and repayment of mortgage-backed securities at fair value	1,085,508	173,862	127,591
Repurchase of loans at fair value	(1,077)	0	0
Sale and repayment of loans at fair value	131,652	622,705	582,207
Repayment of excess servicing spread by PennyMac Financial Services, Inc.	40,316	46,750	54,980
Settlement of firm commitment to purchase credit risk transfer securities	31,925	0	0
Net settlement of derivative financial instruments	(929)	(4,863)	(716)
Sale of real estate acquired in settlement of loans	74,973	99,194	166,921
Purchase of mortgage servicing rights	0	0	(79)
Sale of mortgage servicing rights	17	100	1,199
Deposit of cash securing credit risk transfer arrangements	(933,370)	(596,626)	(152,641)
Distribution from credit risk transfer agreements	221,905	125,920	65,564
Increase in margin deposits	(89,322)	(24,005)	(15,163)
Net cash (used in) provided by investing activities	(704,677)	(1,424,292)	681,681
Cash flows from financing activities
Sale of assets under agreements to repurchase	137,742,171	85,574,226	77,985,354
Repurchase of assets sold under agreements to repurchase	(135,870,355)	(83,978,547)	(78,587,535)
Issuance of mortgage loan participation purchase and sale agreements	4,825,348	7,559,680	6,960,713
Repayment of mortgage loan participation purchase and sale agreements	(5,004,074)	(7,425,503)	(6,942,079)
Issuance of notes payable secured by credit risk transfer and mortgage servicing assets	1,308,730	450,000	396,240
Repayment of notes payable secured by credit risk transfer and mortgage servicing assets	(56,468)	0	(671,346)
Issuance of exchangeable notes with cash conversion option	210,000	0	0
Repayment of asset-backed financing of a variable interest entity at fair value	(42,753)	(21,886)	(51,687)
Sale of assets to PennyMac Financial Services, Inc. under agreements to repurchase	26,503	2,293	0
Repurchase of assets sold to PennyMac Financial Services, Inc. under agreement to repurchase	(50,016)	(15,396)	(5,872)
Payment of debt issuance costs	(15,642)	(13,230)	(13,670)
Payment of contingent underwriting fees	(394)	(136)	(61)
Payment of dividends to preferred shareholders	(24,944)	(24,944)	(14,066)
Payment of dividends to common shareholders	(141,001)	(115,596)	(126,135)
Issuance of preferred shares	0	0	310,000
Payment of issuance costs related to preferred shares	0	0	(10,293)
Issuance of common shares	839,682	0	0
Payment of issuance costs related to common shares	(10,225)	0	0
Payment of vested share-based compensation withholdings	(2,600)	0	0
Repurchase of common shares	0	(10,719)	(91,198)
Net cash provided by (used in) financing activities	3,733,962	1,980,242	(861,635)
Net increase (decrease) in cash	44,211	(17,802)	43,171
Cash at beginning of year	59,845	77,647	34,476
Cash at end of year	$ 104,056	$ 59,845	$ 77,647

Organization

Organization	12 Months Ended
	Dec. 31, 2019
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 and CRT strips (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. Almost all of the loans the Company has acquired in its correspondent production activities have been eligible for sale to government-sponsored entities (“GSEs”) such as the Federal National Mortgage Association (“Fannie Mae”) and the Federal Home Loan Mortgage Corporation (“Freddie Mac”) or through government agencies such as 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.

Concentration of Risks

Concentration of Risks	12 Months Ended
	Dec. 31, 2019
Risks And Uncertainties [Abstract]
Concentration of Risks	Note 2—Concentration of Risks As discussed in Note 1— Organization Credit Risk Note 5 – Loan Sales • 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 credit losses arising from such loans (“Recourse Obligations”); or • beginning in June 2018, entering into firm commitments to purchase and purchasing CRT securities that absorb losses from defaults of such loans and, upon purchase of such securities, holding CRT strips representing an interest-only 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 related 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 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). 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 and CRT arrangements, including its firm commitment to purchase CRT securities: • MSRs are generally subject to loss in fair value when mortgage interest rates decrease. Decreasing mortgage interest rates normally encourage increased mortgage refinancing activity. Increased refinancing activity reduces the expected life of the underlying loans, thereby reducing the cash flows expected to accrue to the MSRs. Reductions in the fair value of MSRs affect income primarily through recognition of the change in fair value. • The Company makes a firm commitment to purchase the CRT securities at the beginning of the aggregation period (the aggregation period is the time during which loans are sold into MBS and accumulated in the reference pool whose losses are the basis for losses chargeable to the CRT arrangements) and before the settlement of the CRT strips. The Company has elected to account for these commitments at fair value. Accordingly, the Company recognizes the fair value of such commitment as it sells loans subject to the firm commitment, and also recognizes changes in fair value of the firm commitment during the time it is outstanding. • The Company has a significant investment in CRT arrangements and carries such arrangements at fair value. 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.

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Significant Accounting Policies	Note 3—Significant Accounting Policies PMT’s significant accounting policies are summarized below. 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 Use of Estimates 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. Consolidation The consolidated financial statements include the accounts of PMT and all wholly-owned subsidiaries. PMT has no significant equity method or cost-basis investments. Intercompany accounts and transactions are eliminated upon consolidation. The Company also consolidates the assets and liabilities included in certain Variable Interest Entities (“VIEs”) discussed below. Variable Interest Entities The Company enters into various types of on- and off-balance sheet transactions with special purpose entities (“SPEs”), which are trusts that are established for a limited purpose. Generally, SPEs are formed in connection with securitization transactions. In a securitization transaction, the Company transfers assets on its balance sheet to an SPE, which then issues various forms of beneficial interests in those assets to investors. In a securitization transaction, the Company typically receives a combination of cash and beneficial interests in the SPE in exchange for the assets transferred by the Company. SPEs are generally VIEs. A VIE is an entity having either a total equity investment at risk that is insufficient to finance its activities without additional subordinated financial support or whose equity investors at risk lack the ability to control the entity’s activities. Variable interests are investments or other interests that will absorb portions of a VIE’s expected losses or receive portions of the VIE’s expected residual returns. Expected residual returns represent the expected positive variability in the fair value of a VIE’s net assets. PMT consolidates the assets and liabilities of VIEs of which the Company is the primary beneficiary. The primary beneficiary is the party that has both the power to direct the activities that most significantly impact the VIE and holds a variable interest that could potentially be significant to the VIE. To determine whether a variable interest the Company holds could potentially be significant to the VIE, the Company considers both qualitative and quantitative factors regarding the nature, size and form of its involvement with the VIE. The Company assesses whether it is the primary beneficiary of a VIE on an ongoing basis. The Company evaluates the securitization trust into which assets are transferred to determine whether the entity is a VIE and whether the Company is the primary beneficiary and therefore is required to consolidate the securitization trust. Jumbo Loan Securitization Transaction On September 30, 2013, the Company completed a securitization transaction in which PMT Loan Trust 2013-J1, a VIE, issued $537.0 million in unpaid principal balance (“UPB”) of certificates backed by fixed-rate prime jumbo loans at a 3.9% weighted cost. The securities issued by the VIE are backed by the expected cash flows from its underlying fixed-rate prime jumbo loans. Cash inflows from these fixed-rate prime jumbo loans are distributed to investors and service providers in accordance with the contractual priority of payments and, as such, most of these inflows must be directed first to service and repay the senior certificates. After the senior certificates are repaid, substantially all cash inflows will be directed to the subordinated certificates until fully repaid and, thereafter, to the residual interest in the trust that the Company owns. The Company retains beneficial interests in the securitization transaction, including subordinated certificates and residual interests issued by the VIE. The Company retains credit risk in the securitization because the Company’s beneficial interests include the most subordinated interests in the securitized assets, which are the first beneficial interests to absorb credit losses on those assets. The Manager expects that any credit losses in the pools of securitized assets will likely be limited to the Company’s subordinated and residual interests. The Company has no obligation to repurchase or replace securitized assets that subsequently become delinquent or are otherwise in default other than pursuant to breaches of representations and warranties. The VIE is consolidated by PMT as the Company determined that it is the primary beneficiary of the VIE. The Company concluded that it is the primary beneficiary of the VIE as it has the power, through its affiliate, PLS, in its role as servicer of the loans, to direct the activities of the trust that most significantly impact the trust’s economic performance and the retained subordinated and residual interest trust certificates expose PMT to losses and returns that could potentially be significant to the VIE. For financial reporting purposes, the loans owned by the consolidated VIE are included in Loans at fair value Asset-backed financing of a variable interest entity Loans at fair value Asset-backed financing of a variable interest entity at fair value The Company recognizes the interest income earned on the loans owned by the VIE and the interest expense attributable to the asset-backed securities issued to nonaffiliates by the VIE on its consolidated income statements. Credit Risk Transfer The Company invests in CRT arrangements with Fannie Mae, pursuant to which PennyMac Corp. (“PMC”), through subsidiary trust entities, sells pools of loans into Fannie Mae-guaranteed loan securitizations while retaining Recourse Obligations in addition to IO ownership interests in such loans. The loans subject to the CRT arrangements were transferred by PMC to subsidiary trust entities which sold the loans into Fannie Mae loan securitizations. Transfers of loans subject to CRT arrangements receive sale accounting treatment. The Company has concluded that its subsidiary trust entities holding its CRT arrangements are VIEs and the Company is the primary beneficiary of the VIEs as it is the holder of the primary beneficial interests which absorb the variability of the trusts’ results of operations. Consolidation of the VIEs results in the inclusion on the Company’s consolidated balance sheet of the fair value of the Recourse Obligations, and retained IO ownership interests in the form of derivative and interest-only strip assets, the deposits pledged to fulfill the Recourse Obligations and an interest only security payable at fair value. The deposits represent the Company’s maximum contractual exposure to claims under its Recourse Obligations and is the sole source of settlement of losses under the CRT arrangements. Gains and losses on the derivative and interest-only strip assets related to CRT arrangements are included in Net gain on investments in the consolidated statements of income. 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. Short-Term Investments Short-term investments are carried at fair value with changes in fair value recognized in current period income. Short-term investments represent deposit accounts. The Company categorizes its short-term investments as “Level 1” fair value assets. Mortgage-Backed Securities Purchases and sales of MBS are recorded as of the trade date. The Company’s investments in MBS are carried at fair value with changes in fair value recognized in current period income. Changes in fair value arising from amortization of purchase premiums and accrual of unearned discounts are recognized using the interest method and are included in Interest income. Net gain on investments. Interest Income Recognition Interest income on MBS is recognized over the life of the security using the interest method. The Company estimates, at the time of purchase, the future expected cash flows and determines the effective interest rate based on the estimated cash flows and the security’s purchase price. The Company updates its cash flow estimates monthly. Loans Loans are carried at their fair values. Changes in the fair value of loans are recognized in current period income. Changes in fair value, other than changes in fair value attributable to accrual of unearned discounts and amortization of purchase premiums, are included in Net gain on investments Loans at fair Net gain on loans acquired for sale Loans acquired for sale at fair value Interest income Loans acquired for sale at fair value Loans at fair value held in VIE Sale Recognition The Company purchases from and sells loans into the secondary mortgage market without recourse for credit losses. However, the Company maintains continuing involvement with the loans in the form of servicing arrangements and the liability under the representations and warranties it makes to purchasers and insurers of the loans. The Company recognizes transfers of loans as sales based on whether the transfer is made to a VIE: • For loans that are not transferred to a VIE, the Company recognizes the transfer as a sale when it surrenders control over the loans. Control over transferred loans is deemed to be surrendered when (i) the loans have been isolated from the Company, (ii) the transferee has the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred loans, and (iii) the Company does not maintain effective control over the transferred loans through either (a) an agreement that entitles and obligates the Company to repurchase or redeem them before their maturity or (b) the ability to unilaterally cause the holder to return specific loans. • For loans that are transferred to a VIE, the Company recognizes the transfer as a sale when it determines that the Company is not the primary beneficiary of the VIE. Interest Income Recognition The Company has the ability but not the intent to hold loans acquired for sale and loans at fair value other than loans held in a VIE for the foreseeable future. Therefore, interest income on loans acquired for sale and loans at fair value other than loans held in a VIE is recognized over the life of the loans using their contractual interest rates. The Company has both the ability and intent to hold loans held in a VIE for the foreseeable future. Therefore, interest income on loans held in a variable interest entity is recognized over the estimated remaining life of the loans using the interest method. Unearned discounts and purchase premiums are accrued and amortized to interest income using the effective interest rate inherent in the estimated cash flows from the loans. Income recognition is suspended and the accrued unpaid interest receivable is reversed against interest income when loans become 90 days delinquent, or when, in the Company’s opinion, a full recovery of income and principal becomes doubtful. Income recognition is resumed when the loan becomes contractually current. Excess Servicing Spread The Company has acquired the right to receive the ESS related to certain of the MSRs owned by PFSI. ESS is carried at its fair value. The Company categorizes ESS as a “Level 3” fair value asset. Interest Income Recognition Interest income for ESS is accrued using the interest method, based upon the expected yield from the ESS through the expected life of the underlying mortgages. Changes to the expected interest yield result in a change in fair value which is recorded in Interest income Derivative and Credit Risk Transfer Strip Assets 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: • Interest rate lock commitments (“IRLCs”) that are created when the Company commits to purchase loans acquired for sale; • CRT Agreements whereby the Company retains a Recourse Obligation relating to certain loans it sells 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 the 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 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 income. The Company does not designate and qualify any of its derivative financial instruments for hedge accounting. Firm Commitment to Purchase Credit Risk Transfer Securities The Company carries its firm commitment to purchase CRT securities at fair value. The firm commitment to purchase CRT securities is recognized initially as a component of Net gain on loans acquired for sale Net gain on investments Real Estate Acquired in Settlement of Loans REO is measured at the lower of the acquisition cost of the property (as measured by purchase price in the case of purchased REO; or the fair value of the loan immediately before REO acquisition in the case of acquisition in settlement of a loan) or its fair value reduced by estimated costs to sell. Changes in fair value to levels that are less than or equal to acquisition cost and gains or losses on sale of REO are recognized in the consolidated statements of income under the caption Results of real estate acquired in settlement of loans Mortgage Servicing Rights MSRs arise from contractual agreements between the Company and investors (or their agents) in mortgage securities and loans. Under these agreements, the Company is obligated to provide loan servicing functions in exchange for fees and other remuneration. The servicing functions typically performed include, among other responsibilities, collecting and remitting loan payments; responding to borrower inquiries; accounting for principal and interest, holding custodial (impound) funds for payment of property taxes and insurance premiums; counseling delinquent borrowers; and supervising the acquisition and disposition of REO. The Company has engaged PFSI to provide these services on its behalf. The Company recognizes MSRs initially at their fair values, either as proceeds from sales of loans where the Company assumes the obligation to service the loan in the sale transaction, or from the purchase of MSRs. The Company categorizes its MSR as a “Level 3” fair value asset. Through December 31, 2017, the Company accounted for MSRs at either the asset’s fair value with changes in fair value recorded in current period earnings or using the amortization method with the MSRs carried at the lower of amortized cost or fair value based on the class of MSR. The Company identified two classes of MSRs: originated MSRs backed by loans with initial interest rates of less than or equal to 4.5%; and originated MSRs backed by loans with initial interest rates of more than 4.5%. Originated MSRs backed by loans with initial interest rates of less than or equal to 4.5% were accounted for using the amortization method. Originated MSRs backed by loans with initial interest rates of more than 4.5% were accounted for at fair value with changes in fair value recorded in current period income. MSRs Accounted for at Fair Value Effective January 1, 2018, the Company accounts for all current classes of MSRs at fair value. Changes in fair value of MSRs accounted for at fair value are recognized in current period income as a component of Net loan servicing fees-from nonaffiliates-amortization, impairment, and changes fair value of mortgage servicing rights MSRs Accounted for Using the MSR Amortization Method The Company amortized MSRs that were accounted for using the MSR amortization method. MSR amortization was determined by applying the ratio of the net MSR cash flows projected for the current period to the projected total remaining net MSR cash flows. The estimated total net MSR cash flows were estimated at the beginning of each month using prepayment inputs applicable at that time. The Company assessed MSRs accounted for using the amortization method for impairment monthly. Impairment occurred when the current fair value of the MSR decreased below the asset’s amortized cost. If MSRs were impaired, the impairment was recognized in current-period income and the carrying value (carrying value is amortized cost reduced by a valuation allowance) of the MSRs was adjusted through a valuation allowance. If the fair value of impaired MSRs subsequently increased, the Company recognized the increase in fair value in current-period earnings and adjusted the carrying value of the MSRs through a reduction in the valuation allowance to adjust the carrying value only to the extent of the valuation allowance. The Company stratified its MSRs by risk characteristic when evaluating for impairment. For purposes of performing its MSR impairment evaluation, the Company stratified its servicing portfolio on the basis of certain risk characteristics including loan type (fixed-rate or adjustable-rate) and note interest rate. Fixed-rate loans were stratified into note interest rate pools of 50 basis points for note interest rates between 3.0% and 4.5% and a single pool for note interest rates below 3%. Adjustable rate loans with initial interest rates of 4.5% or less were evaluated in a single pool. If the fair value of MSRs in any of the note interest rate pools was below the amortized cost of the MSRs for that pool, impairment was recognized to the extent of the difference between the fair value and the existing carrying value for that pool. The Company periodically reviewed the various impairment strata to determine whether the fair value of the impaired MSRs in a given stratum was likely to recover in the foreseeable future. When the Company deemed recovery of the fair value to be unlikely in the foreseeable future, a write-down of the cost of the MSRs for that stratum to its estimated recoverable value was charged to the valuation allowance. Amortization and impairment of MSRs were included in current period income as a component of Net loan servicing fees - from nonaffiliates - Amortization, impairment and change in fair value of mortgage servicing rights. Servicing Advances Servicing advances represent advances made on behalf of borrowers and the loans’ investors to fund delinquent balances for property tax and insurance premiums and out of pocket costs (e.g., preservation and restoration of mortgaged property, legal fees, appraisals and insurance premiums). Servicing advances are made in accordance with the Company’s servicing agreements and, when made, are deemed recoverable. The Company periodically reviews servicing advances for collectability. Servicing advances are written off when they are deemed uncollectible. Borrowings Borrowings, other than Asset-backed financing of a VIE at fair value Interest-only security payable at fair value Interest expense Exchangeable senior notes Notes payable secured by credit risk transfer and mortgage servicing assets Asset-backed financing of a VIE at Fair Value The certificates issued to nonaffiliates by the Company relating to the asset-backed financing are recorded as borrowings. Certificates issued to nonaffiliates have the right to receive principal and interest payments of the loans held by the consolidated VIE. Asset-backed financings of the VIE are carried at fair value. Changes in fair value are recognized in current period income as a component of Net gain on investments Liability for Losses Under Representations and Warranties The Company provides for its estimate of the losses that it expects to incur in the future as a result of its breach of the representations and warranties that it provides to the purchasers and insurers of the loans it has sold. The Company’s agreements with the Agencies and other investors include representations and warranties related to the loans the Company sells to the Agencies and other investors. The representations and warranties require adherence to Agency and other investor origination and underwriting guidelines, including but not limited to the validity of the lien securing the loan, property eligibility, property value, loan amount, borrower credit, income and asset requirements, and compliance with applicable federal, state and local law. In the event of a breach of its representations and warranties, the Company may be required to either repurchase the loans with the identified defects or indemnify the investor or insurer. In such cases, the Company bears any subsequent credit loss on the loans. The Company’s credit loss may be reduced by any recourse it has to correspondent sellers that, in turn, had sold such loans to the Company and breached similar or other representations and warranties. In such event, the Company has the right to seek a recovery of related repurchase losses from that correspondent seller. The Company records a provision for losses relating to representations and warranties as part of its loan sale transactions. The method used to estimate the liability for representations and warranties is a function of the representations and warranties given and considers a combination of factors, including, but not limited to, estimated future defaults and loan defect rates, the estimated severity of loss in the event of default and the probability of reimbursement by the correspondent loan seller. The Company establishes a liability at the time loans are sold and periodically updates its liability estimate. The level of the liability for representations and warranties is reviewed and approved by the Company’s management credit committee. The level of the liability for representations and warranties is difficult to estimate and requires considerable judgment. The level of loan repurchase losses is dependent on economic factors, investor demand strategies, and other external conditions that may change over the lives of the underlying loans. The Company’s representations and warranties are generally not subject to stated limits of exposure. However, the Company believes that the current unpaid principal balance of loans sold by PMT to date represents the maximum exposure to repurchases related to representations and warranties. Loan Servicing Fees Loan servicing fees and other remuneration are received by the Company for servicing residential loans. Loan servicing activities are described under Mortgage servicing rights Loan servicing fee amounts are based upon fee schedules established by the applicable investor and upon the unpaid principal balance of the loans. The Company’s obligation under its loan servicing agreements is fulfilled as the Company services the loans. Loan servicing fees are recorded net of Agency guarantee fees paid by the Company. Loan servicing fees are recorded when the loan payments are collected from the borrowers. Share-Based Compensation The Company amortizes the fair value of previously granted share-based awards to Compensation Compensation The initial cost of share-based awards is established at the Company’s closing share price adjusted for the portion of the awards expected to vest on the date of the award. The Company adjusts the cost of its share-based awards for changes in estimates of the portion of the awards it expects to be forfeited by grantees and for changes in expected performance attainment in each subsequent reporting period until the units have vested or have been forfeited, the service being provided is subsequently completed, or, under certain circumstances, is likely to be completed, whichever occurs first. Income Taxes The Company has elected to be taxed as a REIT and the Company believes PMT complies with the provisions of the Internal Revenue Code applicable to REITs. Accordingly, the Company believes PMT will not be subject to federal income tax on that portion of its REIT taxable income that is distributed to shareholders as long as certain asset, income and share ownership tests are met. If PMT fails to qualify as a REIT, and does not qualify for certain statutory relief provisions, it will be subject to income taxes and may be precluded from qualifying as a REIT for the four tax years following the year of loss of the Company’s REIT qualification. The Company’s taxable REIT subsidiary (“TRS”) is subject to federal and state income taxes. Income taxes are provided for using the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted rates expected to apply to taxable income in the years in which the Company expects those temporary differences to be recovered or settled. The effect on deferred taxes of a change in tax rates is recognized in income in the period in which the change occurs. A valuation allowance is established if, in the Company’s judgment, realization of deferred tax assets is not more likely than not. The Company recognizes a tax benefit relating to tax positions it takes only if it is more likely than not that the position will be sustained upon examination by the appropriate taxing authority. A tax position that meets this standard is recognized as the largest amount that exceeds 50 percent likelihood of being realized upon settlement. The Company will classify any penalties and interest as a component of income tax expense. Recently Issued Accounting Pronouncement In June 2016, the FASB issued Accounting Standard Update No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments ASU 2016-13 is effective January 1, 2020 for the Company. Adoption of ASU 2016-13 will be applied using a modified retrospective approach through a cumulative-effect adjustment to retained earnings as of the effective date. Because of the Company’s current accounting, adoption of ASU 2016-13 on January 1, 2020 is not expected to have a significant effect on the Company’s allowance for credit losses on its assets subject to ASU 2016-13 due to the assets’ relatively short-term lives.

Transactions with Related Parti

Transactions with Related Parties	12 Months Ended
	Dec. 31, 2019
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. Pursuant to the terms of the agreement, the monthly fulfillment fee is an amount that shall equal (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 ranging from two to three and one-half 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 annum 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 on September 12, 2020, subject to automatic renewal for additional 18-month The Company purchases 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: Year ended December 31, 2019 2018 2017 (in thousands) Loan fulfillment fees earned by PLS $ 160,610 $ 81,350 $ 80,359 UPB of loans fulfilled by PLS $ 56,033,704 $ 26,194,303 $ 22,971,119 Sourcing fees received from PLS included in Net gain on loans acquired for sale $ 14,381 $ 10,925 $ 12,084 UPB of loans sold to PLS $ 47,937,306 $ 36,415,933 $ 40,561,241 Purchases of loans acquired for sale from PLS $ 6,255,915 $ 3,343,028 $ 904,097 Tax service fees paid to PLS $ 14,697 $ 7,433 $ 7,078 December 31, 2019 December 31, 2018 (in thousands) Loans included in Loans acquired for sale at fair value pending sale to PLS $ 490,383 $ 86,308 Loan Servicing The Company, through its Operating Partnership, has an amended and restated loan servicing agreement with PLS dated as of September 12, 2016, pursuant to which PLS provides subservicing for the Company's portfolio of residential loans and its portfolio of MSRs. The servicing agreement provides for servicing fees earned by PLS that are based on a percentage of the loan’s unpaid principal balance or fixed per loan monthly amounts based on the delinquency, bankruptcy and/or foreclosure status of the serviced loan or REO. 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. The base servicing fee rates for distressed loans range from $30 per month for current loans up to $85 per month for loans where the borrower has declared bankruptcy. The base servicing fee rate for REO is $75 per month. To the extent that the Company rents its REO under an REO rental program, the Company pays PLS 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 PLS’ cost if property management services and/or any related software costs are outsourced to a third-party property management firm or 9% of gross rental income if PLS provides property management services directly. PLS is also entitled to retain any tenant paid application fees and late rent fees and seek reimbursement for certain third party vendor fees. Except as otherwise provided in the MSR recapture agreement, when PLS effects a refinancing of a loan on behalf of the Company and not through a third-party lender and the resulting loan is readily saleable, or PLS originates a loan to facilitate the disposition of an REO, PLS is entitled to receive from the Company market-based fees and compensation consistent with pricing and terms PLS offers unaffiliated parties on a retail basis. PLS is required to provide a range of services and activities significantly greater in scope than the services provided in connection with a customary servicing arrangement because the Company has a small number of employees and limited infrastructure. For these services, PLS receives a supplemental fee of $25 per month for each distressed loan. PLS is entitled to reimbursement for all customary, good faith reasonable and necessary out-of-pocket expenses incurred in the performance of its servicing obligations. During the period in which the U.S. Department of Treasury’s Home Affordable Modification Plan (“HAMP”) was in effect, PLS, on behalf of the Company, was entitled to retain any incentive payments made to it and to which it was entitled under HAMP, provided, however, that with respect to any such incentive payments paid to PLS under HAMP in connection with a loan modification for which the Company previously paid PLS a modification fee, PLS reimbursed the Company an amount equal to the incentive payments. PLS is also entitled to certain activity-based fees for distressed loans that are charged based on the achievement of certain events. These fees range from $750 for a streamline modification to $1,750 for a full modification or liquidation and $500 for a deed-in-lieu of foreclosure. PLS is not entitled to earn more than one liquidation fee, reperformance fee or modification fee per loan in any 18-month period. The base servicing fees for non-distressed loans subserviced by PLS on the Company’s behalf are also calculated through a monthly per-loan dollar amount, with the actual dollar amount for each loan based on whether the loan is a fixed-rate or adjustable-rate loan. The base servicing fees for loans subserviced on the Company’s behalf 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 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. The term of the loan servicing agreement expires on September 12, 2020, subject to automatic renewal for additional 18-month periods, unless terminated earlier in accordance with the terms of the servicing agreement. Pursuant to the terms of an amended and restated MSR recapture agreement, if PLS refinances loans for which the Company previously held the MSRs, PLS is generally required to transfer and convey to one of the Company’s wholly-owned subsidiaries cash in an amount equal to 30% of the fair market value of the MSRs related to all the loans so originated. The MSR recapture agreement expires, unless terminated earlier in accordance with the agreement, on September 12, 2020, subject to automatic renewal for additional 18-month periods. Following is a summary of loan servicing fees earned by PLS and MSR recapture income earned from PLS: Year ended December 31, 2019 2018 2017 (in thousands) Loan servicing fees: Loans acquired for sale at fair value $ 1,772 $ 1,037 $ 954 Loans at fair value 2,207 7,555 15,610 MSRs 44,818 33,453 26,500 $ 48,797 $ 42,045 $ 43,064 Average investment in: Loans acquired for sale at fair value $ 2,754,955 $ 1,577,395 $ 1,366,017 Loans at fair value: Distressed $ 75,251 $ 473,458 $ 1,152,930 Held in a VIE $ 281,449 $ 301,398 $ 344,942 Average MSR portfolio UPB $ 110,075,179 $ 80,500,212 $ 63,836,843 MSR recapture income recognized included in Net loan servicing fees from PennyMac Financial Services, Inc. $ 5,324 $ 2,192 $ 1,428 Management Fees The Company has a management agreement with PCM, which was amended and restated effective as of September 12, 2016. Under the management agreement, 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 of beneficial interest computed in accordance with GAAP and certain other non-cash charges determined after discussions between PCM and the Company’s 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. The management agreement expires on September 12, 2020, subject to automatic renewal for additional 18-month periods, unless terminated earlier in accordance with the terms of the agreement. 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 immediately preceding the date of termination. Following is a summary of management fee expenses: Year ended December 31, 2019 2018 2017 (in thousands) Base management $ 29,303 $ 23,033 $ 22,280 Performance incentive 7,189 1,432 304 $ 36,492 $ 24,465 $ 22,584 Average shareholders' equity amounts used to calculate management fee expense $ 1,958,970 $ 1,535,590 $ 1,484,446 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. 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. With respect to the allocation of PCM’s and its affiliates’ compensation expenses, from and after September 12, 2016, PCM shall be reimbursed $120,000 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: Year ended December 31, 2019 2018 2017 (in thousands) Reimbursement of: Common overhead incurred by PCM and its affiliates $ 5,340 $ 4,640 $ 5,306 Compensation 480 480 — Expenses incurred on the Company’s behalf, net 4,362 1,113 2,257 $ 10,182 $ 6,233 $ 7,563 Payments and settlements during the year (1) $ 177,116 $ 71,943 $ 64,945 (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 On December 19, 2016, the Company, through a wholly-owned subsidiary, PennyMac Holdings, LLC (“PMH”), amended and restated a 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, the right to receive 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 the parties’ 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. Following is a summary of investing activities between the Company and PFSI: Year ended December 31, 2019 2018 2017 (in thousands) ESS: Received pursuant to a recapture agreement $ 1,757 $ 2,688 $ 5,244 Repayments and sales $ 40,316 $ 46,750 $ 54,980 Interest income $ 10,291 $ 15,138 $ 16,951 Net (loss) gain included in Net gain (loss) on investments: Valuation changes $ (9,256 ) $ 8,500 $ (19,350 ) Recapture income 1,726 2,584 4,820 $ (7,530 ) $ 11,084 $ (14,530 ) December 31, 2019 2018 (in thousands) Excess servicing spread purchased from PennyMac Financial Services, Inc. at fair value $ 178,586 $ 216,110 Financing Activities PFSI held 75,000 of the Company’s common shares at both December 31, 2019 and December 31, 2018. 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 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. The principal amount paid by PLS for the participation certificates under the PMH Repurchase Agreement is based upon a percentage of the market value of the underlying ESS. Upon PMH’s repurchase of the participation certificates, PMH is required to repay PLS the principal amount relating thereto plus accrued interest (at a rate reflective of the current market and consistent with the weighted average note rate of the VFN and any outstanding Term Notes) to the date of such repurchase. PLS is then required to repay the Issuer Trust the corresponding amount under the PC Repurchase Agreement. Conditional Reimbursement of Initial Public Offering (“IPO”) Underwriting Fees In connection with its IPO, the Company conditionally agreed to reimburse PCM up to $2.9 million for underwriting fees paid to the IPO underwriters by PCM on the Company’s behalf (the “Conditional Reimbursement”). On February 1, 2019, the term of the reimbursement agreement was extended and now expires on February 1, 2023. Following is a summary of financing activities between the Company and PFSI: Year ended December 31, 2019 2018 2017 (in thousands) Net repayments of assets sold under agreements to repurchase $ 23,513 $ 13,103 $ 5,872 Interest expense $ 6,302 $ 7,462 $ 8,038 Payment of conditional reimbursement to PCM $ 580 $ 69 $ 30 December 31, 2019 December 31, 2018 (in thousands) Assets sold to PFSI under agreement to repurchase $ 107,512 $ 131,025 Conditional Reimbursement payable to PCM included in Due to PennyMac Financial Services, Inc. $ 221 $ 801 Amounts Receivable from and Payable to PFSI Amounts receivable from and payable to PFSI are summarized below: December 31, 2019 December 31, 2018 (in thousands) Due from PFSI: MSR recapture $ 149 $ 179 Other 2,611 3,898 $ 2,760 $ 4,077 Due to PFSI: Fulfillment fees $ 18,285 $ 10,006 Correspondent production fees 10,606 2,071 Management fees 10,579 6,559 Loan servicing fees 4,659 4,841 Allocated expenses and expenses paid by PFSI on PMT’s behalf 3,724 9,066 Conditional Reimbursement 221 801 Interest on Assets sold to PFSI under agreement to repurchase 85 120 $ 48,159 $ 33,464 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 on the respective balance sheet items as summarized below: Balance sheet line including advance amount December 31, 2019 December 31, 2018 (in thousands) Loan servicing advances $ 48,971 $ 67,666 Real estate acquired in settlement of loans 21,549 32,888 $ 70,520 $ 100,554

Loan Sales

Loan Sales	12 Months Ended
	Dec. 31, 2019
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: Year ended December 31, 2019 2018 2017 (in thousands) Cash flows: Proceeds from sales $ 61,128,081 $ 29,369,656 $ 24,314,165 Loan servicing fees received net of guarantee fees $ 295,390 $ 204,663 $ 164,776 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: December 31, 2019 December 31, 2018 (in thousands) UPB of loans outstanding $ 130,663,117 $ 91,982,335 Collection Status (UPB) Delinquency: 30-89 days delinquent $ 1,014,094 $ 614,668 90 or more days delinquent: Not in foreclosure $ 258,036 $ 142,871 In foreclosure $ 53,697 $ 40,445 Bankruptcy $ 130,936 $ 75,947 Custodial funds managed by the Company (1) $ 2,529,984 $ 970,328 (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 Interest income

Variable Interest Entities

Variable Interest Entities	12 Months Ended
	Dec. 31, 2019
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 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 are accounted for as sales. The Company places 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 a different type of CRT arrangement. Under the new arrangement, the Company sells loans subject to agreements that require the Company to purchase securities that absorb incurred credit losses on such loans. The Company recognizes these purchase commitments initially as a component of Net gain on loans acquired for sale Net gain (loss) on investments During 2019, the Company purchased securities subject to the firm commitments. Similar to the CRT Agreements, the Company accounts for the cash collateralizing these securities as Deposits securing CRT arrangements and recognizes its IO ownership interests and Recourse Obligations as CRT strips which are included on the consolidated balance sheet in Derivative and credit risk transfer strip assets. 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 on investments in the consolidated statements of income and Derivative and credit risk transfer strip assets on the consolidated balance sheets. Following is a summary of the CRT arrangements: Year ended December 31, 2019 2018 2017 (in thousands) UPB of loans sold $ 47,748,300 $ 21,939,277 $ 14,529,548 Investments: Deposits securing CRT arrangements $ 933,370 $ 596,626 $ 152,641 Change in expected face amount of firm commitment to purchase CRT securities and commitments to fund Deposits securing CRT arrangements resulting from sales of loans 897,151 122,581 390,362 $ 1,830,521 $ 719,207 $ 543,003 Investment income: Net gain on investments: Derivative and CRT strip assets: CRT strips Realized $ 32,200 Valuation changes (1,874 ) 30,326 CRT derivatives Realized 79,619 $ 86,928 $ 51,731 Valuation changes (9,571 ) 25,347 83,030 70,048 112,275 134,761 Interest-only security payable at fair value 10,302 (19,332 ) (11,033 ) 110,676 92,943 123,728 Firm commitments to purchase CRT securities 60,943 7,399 — 171,619 100,342 123,728 Net gain on loans acquired for sale - Fair value of firm commitment to purchase CRT securities recognized upon sale of loans 99,305 30,595 — Interest income - Deposits securing CRT arrangements 34,229 15,441 4,291 $ 305,153 $ 146,378 $ 128,019 Payments made to settle losses on credit risk transfer arrangements $ 5,165 $ 2,133 $ 1,396 December 31, 2019 December 31, 2018 (in thousands) Carrying value of CRT arrangements: Derivative and credit risk transfer strip assets CRT strips $ 54,930 $ — CRT derivatives 115,863 123,987 $ 170,793 $ 123,987 Firm commitment to purchase credit risk transfer securities at fair value $ 109,513 $ 37,994 Deposits securing credit risk transfer arrangements $ 1,969,784 $ 1,146,501 Interest-only security payable at fair value $ 25,709 $ 36,011 CRT arrangement assets pledged to secure borrowings: Derivative and credit risk transfer strip assets $ 142,183 $ 87,976 Deposits securing CRT arrangements $ 1,969,784 $ 1,146,501 Face amount of firm commitment to purchase CRT securities $ 1,502,203 $ 605,052 UPB of loans - funded credit risk transfer arrangements $ 41,944,117 $ 29,934,003 Collection status (UPB): Delinquency Current $ 41,355,622 $ 29,633,133 30—89 days delinquent $ 463,331 $ 228,296 90—180 days delinquent $ 106,234 $ 39,826 180 or more days delinquent $ 8,802 $ 4,208 Foreclosure $ 10,128 $ 5,180 Bankruptcy $ 55,452 $ 23,360 UPB of loans - firm commitment to purchase CRT securities $ 38,738,396 $ 16,392,300 Collection status (UPB): Delinquency Current $ 38,581,080 $ 16,329,044 30—89 days delinquent $ 146,256 $ 61,035 90—180 days delinquent $ 9,109 $ 2,221 180 or more days delinquent $ — $ — Foreclosure $ 1,951 $ — Bankruptcy $ 2,980 $ 1,258 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: Year ended December 31, 2019 2018 2017 (in thousands) Interest income $ 11,734 $ 11,813 $ 14,425 Interest expense $ 11,324 $ 10,821 $ 13,184 December 31, 2019 December 31, 2018 (in thousands) Loans at fair value $ 256,367 $ 290,573 Asset-backed financing at fair value $ 243,360 $ 276,499 Certificates retained at fair value $ 13,007 $ 14,074

Fair Value

Fair Value	12 Months Ended
	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value	Note 7—Fair Value Fair Value Accounting Elections 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: December 31, 2019 Level 1 Level 2 Level 3 Total (in thousands) Assets: Short-term investments $ 90,836 $ — $ — $ 90,836 Mortgage-backed securities at fair value — 2,839,633 — 2,839,633 Loans acquired for sale at fair value — 4,129,858 18,567 4,148,425 Loans at fair value — 256,367 14,426 270,793 Excess servicing spread purchased from PFSI — — 178,586 178,586 Derivative and credit risk transfer strip assets: Credit risk transfer strips — — 54,930 54,930 CRT derivatives — — 115,863 115,863 Interest rate lock commitments — — 11,726 11,726 Repurchase agreement derivatives — — 5,275 5,275 Forward purchase contracts — 7,525 — 7,525 Forward sale contracts — 637 — 637 MBS put options — 1,625 — 1,625 Swap futures — 4,347 — 4,347 Swaptions — — — — Call options on interest rate futures 3,809 — — 3,809 Put options on interest rate futures 2,859 — — 2,859 Total derivative and credit risk transfer strip assets before netting 6,668 14,134 187,794 208,596 Netting — — — (6,278 ) Total derivative and credit risk transfer strip assets after netting 6,668 14,134 187,794 202,318 Firm commitment to purchase credit risk transfer securities at fair value — — 109,513 109,513 Mortgage servicing rights at fair value — — 1,535,705 1,535,705 $ 97,504 $ 7,239,992 $ 2,044,591 $ 9,375,809 Liabilities: Asset-backed financing of a VIE at fair value $ — $ 243,360 $ — $ 243,360 Interest-only security payable at fair value — — 25,709 25,709 Derivative liabilities: Interest rate lock commitments — — 572 572 Forward purchase contracts — 3,600 — 3,600 Forward sales contracts — 15,644 — 15,644 Total derivative liabilities before netting — 19,244 572 19,816 Netting — — — (13,393 ) Total derivative liabilities after netting — 19,244 572 6,423 $ — $ 262,604 $ 26,281 $ 275,492 December 31, 2018 Level 1 Level 2 Level 3 Total (in thousands) Assets: Short-term investments $ 74,850 $ — $ — $ 74,850 Mortgage-backed securities at fair value — 2,610,422 — 2,610,422 Loans acquired for sale at fair value — 1,626,483 17,474 1,643,957 Loans at fair value — 290,573 117,732 408,305 Excess servicing spread purchased from PFSI — — 216,110 216,110 Derivative assets: CRT derivatives — — 123,987 123,987 Interest rate lock commitments — — 12,162 12,162 Repurchase agreement derivatives — — 14,511 14,511 Forward purchase contracts — 14,845 — 14,845 Forward sale contracts — 13 — 13 MBS put options — 218 — 218 MBS call options — 945 — 945 Call options on interest rate futures 5,137 — — 5,137 Put options on interest rate futures 178 — — 178 Total derivative assets before netting 5,315 16,021 150,660 171,996 Netting — — — (4,831 ) Total derivative assets after netting 5,315 16,021 150,660 167,165 Firm commitment to purchase credit risk transfer securities at fair value — — 37,994 37,994 Mortgage servicing rights at fair value — — 1,162,369 1,162,369 $ 80,165 $ 4,543,499 $ 1,702,339 $ 6,321,172 Liabilities: Asset-backed financing of a VIE at fair value $ — $ 276,499 $ — $ 276,499 Interest-only security payable at fair value — — 36,011 36,011 Derivative liabilities: Interest rate lock commitments — — 174 174 Forward purchase contracts — 43 — 43 Forward sales contracts — 29,273 — 29,273 Total derivative liabilities before netting — 29,316 174 29,490 Netting — — — (23,576 ) Total derivative liabilities after netting — 29,316 174 5,914 $ — $ 305,815 $ 36,185 $ 318,424 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 years presented: Year ended December 31, 2019 Assets Loans acquired for sale Loans at fair value Excess servicing spread CRT strips CRT derivatives Interest rate lock commitments (1) Repurchase agreement derivatives Firm commitment to purchase CRT securities Mortgage servicing rights Total (in thousands) Balance, December 31, 2018 $ 17,474 $ 117,732 $ 216,110 $ — $ 123,987 $ 11,988 $ 14,511 $ 37,994 $ 1,162,369 $ 1,702,165 Purchases and issuances 26,823 1,077 — — — 65,051 10,057 — — 103,008 Repayments and sales (27,609 ) (88,460 ) (40,316 ) (32,200 ) (78,172 ) — (19,317 ) (31,925 ) (17 ) (318,016 ) Capitalization of interest and fees — 2,318 10,291 — — — — — — 12,609 Capitalization of advances — 1,340 — — — — — — — 1,340 ESS received pursuant to a recapture agreement with PFSI — — 1,757 — — — — — — 1,757 Amounts received as proceeds from sales of loans — — — — — — — 99,305 837,706 937,011 Changes in fair value included in income arising from: Changes in instrument- specific credit risk — 3,737 — — — — — — — 3,737 Other factors 1,070 (10,906 ) (9,256 ) 30,326 70,048 80,133 24 60,943 (464,353 ) (241,971 ) 1,070 (7,169 ) (9,256 ) 30,326 70,048 80,133 24 60,943 (464,353 ) (238,234 ) Transfers: Loans to REO — (12,412 ) — — — — — — — (12,412 ) Loans acquired for sale at fair value from "Level 2" to "Level 3" (2) 809 — — — — — — — — 809 Firm commitment to purchase CRT securities to CRT strips — — — 56,804 — — — (56,804 ) — — Interest rate lock commitments to loans acquired for sale (3) — — — — — (146,018 ) — — — (146,018 ) Balance, December 31, 2019 $ 18,567 $ 14,426 $ 178,586 $ 54,930 $ 115,863 $ 11,154 $ 5,275 $ 109,513 $ 1,535,705 $ 2,044,019 Changes in fair value recognized during the year relating to assets still held at December 31, 2019 $ 121 $ (8,255 ) $ (9,256 ) $ (1,874 ) $ (9,571 ) $ 11,154 $ 107 $ 29,808 $ (464,353 ) $ (452,119 ) (1) For the purpose of this table, IRLC asset and liability positions are shown net. (2) The Company identified certain “Level 2” fair value loans acquired for sale that were not saleable into the prime mortgage market and therefore transferred them to “Level 3”. (3) 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 Year ended December 31, 2019 (in thousands) Interest-only security payable: Balance, December 31, 2018 $ 36,011 Changes in fair value included in income arising from: Changes in instrument-specific credit risk — Other factors (10,302 ) (10,302 ) Balance, December 31, 2019 $ 25,709 Changes in fair value recognized during the year relating to liability outstanding at December 31, 2019 $ (10,302 ) Year ended December 31, 2018 Assets Loans acquired for sale Loans at fair value Excess servicing spread Interest rate lock commitments (1) CRT derivatives Repurchase agreement derivatives Firm commitment to purchase CRT securities Mortgage servicing rights Total (in thousands) Balance, December 31, 2017 $ 8,135 $ 768,433 $ 236,534 $ 4,632 $ 98,640 $ 3,748 $ — $ 91,459 $ 1,211,581 Cumulative effect of a change in accounting principle — Adoption of fair value accounting for mortgage servicing rights — — — — — — — 773,035 773,035 Balance, January 1, 2018 8,135 768,433 236,534 4,632 98,640 3,748 — 864,494 1,984,616 Purchases and issuances 12,208 — — 4,655 — 19,918 — — 36,781 Repayments and sales (12,934 ) (600,638 ) (46,750 ) — (86,928 ) (8,964 ) — (100 ) (756,314 ) Capitalization of interest — 7,439 15,138 — — — — — 22,577 Capitalization of advances — 5,481 — — — — — — 5,481 ESS received pursuant to a recapture agreement with PFSI — — 2,688 — — — — — 2,688 Amounts received as proceeds from sales of loan — — — — — — 30,595 356,755 387,350 Changes in fair value included in income arising from: Changes in instrument- specific credit risk — 2,907 — — — — — — 2,907 Other factors (16 ) (18,104 ) 8,500 (14,016 ) 112,275 (191 ) 7,399 (58,780 ) 37,067 (16 ) (15,197 ) 8,500 (14,016 ) 112,275 (191 ) 7,399 (58,780 ) 39,974 Transfers: Loans to REO — (47,786 ) — — — — — — (47,786 ) Loans acquired for sale at fair value from "Level 2" to "Level 3" (2) 10,081 — — — — — — — 10,081 Interest rate lock commitments to loans acquired for sale (3) — — — 16,717 — — — — 16,717 Balance, December 31, 2018 $ 17,474 $ 117,732 $ 216,110 $ 11,988 $ 123,987 $ 14,511 $ 37,994 $ 1,162,369 $ 1,702,165 Changes in fair value recognized during the year relating to assets still held at December 31, 2018 $ (158 ) $ (18,428 ) $ 8,500 $ 11,988 $ 25,347 $ 77 $ 37,994 $ (58,780 ) $ 6,540 (1) For the purpose of this table, IRLC asset and liability positions are shown net. (2) The Company identified certain “Level 2” fair value loans acquired for sale that were not saleable into the prime mortgage market and therefore transferred them to “Level 3”. (3) 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 Year ended December 31, 2018 (in thousands) Interest-only security payable: Balance, December 31, 2017 $ 7,070 Changes in fair value included in income arising from: Changes in instrument-specific credit risk — Other factors 28,941 28,941 Balance, December 31, 2018 $ 36,011 Changes in fair value recognized during the year relating to liability outstanding at December 31, 2018 $ 28,941 Year ended December 31, 2017 Assets Loans acquired for sale Loans at fair value Excess servicing spread Interest rate lock commitments (1) CRT derivatives Repurchase agreement derivatives Mortgage servicing rights Total (in thousands) Balance, January 31, 2016 $ 5,682 $ 1,354,572 $ 288,669 $ 3,777 $ 15,610 $ — $ 64,136 $ 1,732,446 Purchases and issuances 11,415 — — 36,005 — 3,864 79 51,363 Repayments and sales (12,513 ) (530,367 ) (54,980 ) — (51,731 ) — — (649,591 ) Capitalization of interest — 30,795 16,951 — — — — 47,746 Capitalization of advances — 18,923 — — — — — 18,923 ESS received pursuant to a recapture agreement with PFSI — — 5,244 — — — — 5,244 Amounts received as proceeds from sales of loans — — — — — — 41,379 41,379 Changes in fair value included in income arising from: Changes in instrument- specific credit risk — 24,685 — — — — — 24,685 Other factors 1,045 (25,369 ) (19,350 ) 45,304 134,761 (116 ) (14,135 ) 122,140 1,045 (684 ) (19,350 ) 45,304 134,761 (116 ) (14,135 ) 146,825 Transfers: Loans to REO — (104,806 ) — — — — — (104,806 ) Loans acquired for sale at fair value from "Level 2" to "Level 3" (2) 2,506 — — — — — — 2,506 Interest rate lock commitments to loans acquired for sale (3) — — — (80,454 ) — — — (80,454 ) Balance, December 31, 2017 $ 8,135 $ 768,433 $ 236,534 $ 4,632 $ 98,640 $ 3,748 $ 91,459 $ 1,211,581 Changes in fair value recognized during the year relating to assets still held at December 31, 2017 $ 98 $ (10,594 ) $ (19,350 ) $ 4,632 $ 83,030 $ (116 ) $ (14,135 ) $ 43,565 (1) For the purpose of this table, IRLC asset and liability positions are shown net. (2) The Company identified certain “Level 2” fair value loans acquired for sale that were not saleable into the prime mortgage market and therefore transferred them to “Level 3”. (3) 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 Year ended December 31, 2017 (in thousands) Interest-only security payable: Balance, December 31, 2016 $ 4,114 Changes in fair value included in income arising from: Changes in instrument- specific credit risk — Other factors 2,956 2,956 Balance, December 31, 2017 $ 7,070 Changes in fair value recognized during the year relating to liability outstanding at December 31, 2017 $ 2,956 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: December 31, 2019 December 31, 2018 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: $ 4,147,374 $ 4,010,444 $ 136,930 $ 1,643,465 $ 1,580,504 $ 62,961 90 or more days delinquent: Not in foreclosure 572 615 (43 ) 492 492 — In foreclosure 479 566 (87 ) — — — 1,051 1,181 (130 ) 492 492 — $ 4,148,425 $ 4,011,625 $ 136,800 $ 1,643,957 $ 1,580,996 $ 62,961 Loans at fair value: Loans held in a consolidated VIE: Current through 89 days delinquent $ 255,706 $ 251,425 $ 4,281 $ 290,573 $ 294,617 $ (4,044 ) 90 or more days delinquent: Not in foreclosure 661 809 (148 ) — — — In foreclosure — — — — — — 661 809 (148 ) — — — 256,367 252,234 4,133 290,573 294,617 (4,044 ) Distressed loans: Current through 89 days delinquent 3,179 6,202 (3,023 ) 28,806 43,043 (14,237 ) 90 or more days delinquent: Not in foreclosure 4,897 13,154 (8,257 ) 37,288 71,732 (34,444 ) In foreclosure 6,350 15,698 (9,348 ) 51,638 86,259 (34,621 ) 11,247 28,852 (17,605 ) 88,926 157,991 (69,065 ) 14,426 35,054 (20,628 ) 117,732 201,034 (83,302 ) $ 270,793 $ 287,288 $ (16,495 ) $ 408,305 $ 495,651 $ (87,346 ) Following are the changes in fair value included in current period income by consolidated statement of income line item for financial statement items accounted for under the fair value option: Year ended December 31, 2019 Net gain on investments Net gain on loans acquired for sale Net loan servicing fees Net interest income Total (in thousands) Assets: Mortgage-backed securities at fair value $ 77,283 $ — $ — $ (12,853 ) $ 64,430 Credit risk transfer strips 30,326 — — — 30,326 Loans acquired for sale at fair value — 163,244 — — 163,244 Loans at fair value 714 — — 3,420 4,134 ESS at fair value (9,256 ) — — 10,291 1,035 Firm commitment to purchase credit risk transfer securities at fair value 60,943 99,305 — — 160,248 MSRs at fair value — — (464,353 ) — (464,353 ) $ 160,010 $ 262,549 $ (464,353 ) $ 858 $ (40,936 ) Liabilities: Interest-only security payable at fair value $ 10,302 $ — $ — $ — $ 10,302 Asset-backed financing of a VIE at fair value (7,553 ) — — (2,061 ) (9,614 ) $ 2,749 $ — $ — $ (2,061 ) $ 688 Year ended December 31, 2018 Net gain on investments Net gain on loans acquired for sale Net loan servicing fees Net interest income Total (in thousands) Assets: Mortgage-backed securities at fair value $ (11,262 ) $ — $ — $ (4,793 ) $ (16,055 ) Loans acquired for sale at fair value — (5,298 ) — — (5,298 ) Loans at fair value (23,696 ) — — 7,539 (16,157 ) ESS at fair value 8,500 — — 15,138 23,638 Firm commitment to purchase credit risk transfer securities at fair value 7,399 30,595 — — 37,994 MSRs at fair value — — (58,780 ) — (58,780 ) $ (19,059 ) $ 25,297 $ (58,780 ) $ 17,884 $ (34,658 ) Liabilities: Interest-only security payable at fair value $ (28,941 ) $ — $ — $ — $ (28,941 ) Asset-backed financing of a VIE at fair value 9,610 — — (577 ) 9,033 $ (19,331 ) $ — $ — $ (577 ) $ (19,908 ) Year ended December 31, 2017 Net gain on investments Net gain on loans acquired for sale Net loan servicing fees Net interest income Total (in thousands) Assets: Mortgage-backed securities at fair value $ 5,498 $ — $ — $ 5,367 $ 10,865 Loans acquired for sale at fair value — 97,940 — — 97,940 Loans at fair value 3,582 — — 32,239 35,821 ESS at fair value (19,350 ) — — 16,951 (2,399 ) MSRs at fair value — — (14,135 ) — (14,135 ) $ (10,270 ) $ 97,940 $ (14,135 ) $ 54,557 $ 128,092 Liabilities: Interest-only security payable $ 2,956 $ — $ — $ — $ 2,956 Asset-backed financing of a VIE at fair value (3,426 ) — — (1,781 ) (5,207 ) $ (470 ) $ — $ — $ (1,781 ) $ (2,251 ) 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 year based on fair value on a nonrecurring basis: Real estate acquired in settlement of loans Level 1 Level 2 Level 3 Total (in thousands) December 31, 2019 $ — $ — $ 24,115 $ 24,115 December 31, 2018 $ — $ — $ 24,515 $ 24,515 The following table summarizes the fair value changes recognized during the year on assets held at year end that were remeasured at fair value on a nonrecurring basis: Year ended December 31, 2019 2018 2017 (in thousands) Real estate asset acquired in settlement of loans $ (2,155 ) $ (4,434 ) $ (11,882 ) MSRs at lower of amortized cost or fair value — — (5,876 ) $ (2,155 ) $ (4,434 ) $ (17,758 ) 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 in the Company’s consolidated statements of income. 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 Exchangeable senior notes, Notes payable secured by credit risk transfer and mortgage servicing assets 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 The fair value of the Term Notes at December 31, 2019 was based on non-affiliate broker indications of fair value. The fair value of Term Notes at December 31, 2018 was estimated using a discounted cash flow approach using indications of market pricing spreads provided by non-affiliate brokers to develop an appropriate discount rate. Following are the fair values of the Notes payable secured by credit risk transfer and mortgage servicing rights Exchangeable senior notes December 31, 2019 December 31, 2018 Instrument Carrying value Fair value Carrying value Fair value (in thousands) Notes payable secured by credit risk transfer and mortgage servicing assets $ 1,696,295 $ 1,705,544 $ 445,573 $ 444,403 Exchangeable senior notes $ 443,506 $ 462,117 $ 248,350 $ 247,172 Valuation Governance Most of the Company’s assets, its Asset-backed financing of a VIE at fair value, Interest-only security payable Derivative 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. The FAV group monitors the models used for valuation of the Company’s “Level 3” fair value assets and liabilities, including the models’ performance versus actual results, and reports those results to PFSI’s senior management valuation committee. During the periods presented, PFSI’s senior management valuation committee included the Company’s executive chairman, chief executive, chief financial, chief risk and deputy chief financial officers. 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 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 gain 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 fair values 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 primarily of distressed loans, are categorized as “Level 3” fair value assets and: • before September 30, 2019, the distressed loans’ fair values were estimated using a discounted cash flow approach. Inputs to the discounted cash flow model included 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. • beginning September 30, 2019, the Company changed its discounted cash flow approach and the inputs to the model. Distressed loan fair values are now estimated based on the expected resolution to be realized from the individual asset’s disposition strategies. 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%. The Company changed its approach to valuation of distressed loans during the quarter ended September 30, 2019 because it substantially liquidated its investment in distressed loans during the quarter and concluded that the small number of remaining assets are most accurately valued on an individual expected resolution basis Before September 30, 2019, the significant unobservable inputs used in the fair value measurement of the Company’s loans at fair value were discount rate, home price projections, voluntary prepayment speeds and default speeds. Significant changes in any of those inputs in isolation could result in a significant change to the loans’ fair value measurement. Increases in home price projections are generally accompanied by an increase in voluntary prepayment speeds. Changes in the fair value of loans at fair value are included in Net gain on investments Following is a quantitative summary of key inputs used in the valuation of the Company’s “Level 3” loans at fair value: Key inputs (1) December 31, 2018 Fair value (in thousands) $ 117,732 Discount rate Range 2.8% – 19.6% Weighted average 12.0% Twelve-month projected housing price index change Range 3.1% – 3.7% Weighted average 3.4% Voluntary prepayment speed (2) Range 0.9% – 8.3% Weighted average 3.2% Total prepayment speed (3) Range 8.3% – 22.0% Weighted average 18.3% (1) Weighted-average inputs are based on fair value amounts of the loans. (2) Voluntary prepayment speed is measured using Life Voluntary Conditional Prepayment Rate (“CPR”). (3) Total prepayment speed is measured using Life Total CPR. Changes in fair value attributable to changes in instrument-specific credit risk were measured by the effect on fair value of the change in the respective loan’s delinquency status and performance history at year end from the later of the beginning of the year or acquisition date. 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 necessarily directly related. Changes in the fair value of ESS are included in Net gain on investments Following are the key inputs used in determining the fair value of ESS: December 31, 2019 December 31, 2018 Fair value (in thousands) $ 178,586 $ 216,110 UPB of underlying loans (in thousands) $ 19,904,571 $ 23,196,033 Average servicing fee rate (in basis points) 34 34 Average ESS rate (in basis points) 19 19 Key inputs (1) Pricing spread (2) Range 3.0% – 3.3% 2.8% - 3.2% Weighted average 3.1% 3.1% Annual total prepayment speed (3) Range 8.7% – 16.2% 8.2% - 29.5% Weighted average 11.0% 9.7% Life (in years) Range 2.7 - 7.2 1.6 - 7.6 Weighted average 6.1 6.8 (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 CPR. Equivalent life information is included for informational purposes. Derivative and Credit Risk Transfer Strip Assets Derivative Assets CRT Derivatives The Company categorizes CRT derivatives as “Level 3” fair value assets. 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 interest in the trust holding the Deposits securing credit risk transfer arrangements pledged to creditors Deposits securing credit risk transfer arrangements pledged to creditors The significant unobservable inputs used by the Company in its review and approval of the valuation of CRT derivatives 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 gain (loss) 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 Agreements: December 31, 2019 December 31, 2018 (dollars in thousands) Fair value CRT derivatives $ 115,863 $ 123,987 Deposits securing CRT arrangements $ 1,524,590 $ 1,146,501 UPB of loans in reference pools $ 24,824,616 $ 29,934,003 Key inputs (1) Discount rate Range 4.7% – 5.3% 6.6% – 7.5% Weighted average 5.2% 7.3% Voluntary prepayment speed (2) Range 16.4% – 18.5% 9.0% – 10.6% Weighted average 17.9% 9.9% Involuntary prepayment speed (3) Range 0.2% – 0.3% 0.2% – 0.2% Weighted average 0.3% 0.2% Remaining loss expectation (4) Range 0.1% – 0.1% 0.1% – 0.2% Weighted average 0.1% 0.2% (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. (4) Remaining loss expectation is measured as expected future contractual losses divided by the UPB of the reference loans. 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 gain on loans acquired for sale Following is a quantitative summary of key unobservable inputs used in the valuation of IRLCs: December 31, 2019 December 31, 2018 Fair value (in thousands) (1) $ 11,154 $ 11,988 Key inputs (2) Pull-through rate Range 64.6% – 100% 45.4% - 100% Weighted average 93.3% 91.8% MSR fair value expressed as Servicing fee multiple Range 2.1 - 5.8 2.4 - 5.6 Weighted average 4.7 4.3 Percentage of UPB Range 0.7% - 2.2% 0.6% - 3.6% Weighted average 1.4% 2.2% (1) For purposes of this table, IRLC asset and liability positions are shown net. (2) Weighted-average inputs are based on the committed amounts. Repurchase Agreement Derivatives The Company had a master repurchase agreement that included incentives for financing loans approved for satisfying certain consumer relief characteristics. These incentives are classified as embedded derivatives for reporting purposes and are reported separately from the repurchase agreements. The Company classifies repurchase agreement derivatives as “Level 3” fair value assets. The significant unobservable inputs into the valuation of repurchase agreement derivative assets are the discount rate and the expected approval rate of the loans financed under the master repurchase agreement. The resulting ratios included in the Company’s fair value estimate were 99% and 97% at December 31, 2019 and 2018, respectively. Changes in fair value of repurchase agreement derivatives are included in Interest expense 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 gain on investments Net gain on loans acquired for sale Net loan servicing fees, Credit Risk Transfer Strips The Company categorizes CRT strips as “Level 3” fair value assets. 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 gain (loss) on investments Following is a quantitative summary of key unobservable inputs used to derive the fair value of the CRT strips in the Company’s review and approval of the adjusted broker-provided fair values: December 31, 2019 (dollars in thousands) Carrying value CRT strips $ 54,930 Deposits securing CRT arrangements $ 445,194 UPB of loans in the reference pools $ 17,119,501 Key inputs (1) Discount rate 6.3% Voluntary prepayment speed (2) 23.4% Involuntary prepayment speed (3) 0.2% Remaining loss expectation (4) 0.1% (1) Weighted average inputs are based on the UPB of the reference 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

Mortgage Backed Securities

Mortgage Backed Securities	12 Months Ended
	Dec. 31, 2019
Mortgage Backed Securities [Abstract]
Mortgage Backed Securities	Note 8—Mortgage Backed Securities Following is a summary of activity in the Company’s investment in MBS: Year ended December 31, 2019 2018 2017 (in thousands) Balance at beginning of year $ 2,610,422 $ 989,461 $ 865,061 Purchases 1,250,289 1,810,877 251,872 Sales (704,178 ) — (1,206 ) Repayments (381,330 ) (173,862 ) (126,385 ) Changes in fair value included in income arising from: Amortization of purchase premiums (12,853 ) (4,792 ) (5,367 ) Valuation adjustments 77,283 (11,262 ) 5,486 64,430 (16,054 ) 119 Balance at end of year $ 2,839,633 $ 2,610,422 $ 989,461 Following is a summary of the Company’s investment in MBS: December 31, 2019 December 31, 2018 Agency: (1) Principal balance Unamortized purchase premiums Accumulated valuation changes Fair value Principal balance Unamortized purchase premiums Accumulated valuation changes Fair value (in thousands) Fannie Mae $ 1,946,203 $ 29,657 $ 33,233 $ 2,009,093 $ 2,050,769 $ 39,488 $ (14,920 ) $ 2,075,337 Freddie Mac 809,595 11,083 9,862 830,540 530,734 6,702 (2,351 ) 535,085 $ 2,755,798 $ 40,740 $ 43,095 $ 2,839,633 $ 2,581,503 $ 46,190 $ (17,271 ) $ 2,610,422 (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	12 Months Ended
	Dec. 31, 2019
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. Following is a summary of the distribution of the Company’s loans acquired for sale at fair value: Loan type December 31, 2019 December 31, 2018 (in thousands) Agency-eligible $ 3,626,038 $ 1,495,954 Held for sale to PLS — Government insured or guaranteed 490,383 86,308 Jumbo 13,437 44,221 Commercial real estate 1,015 8,559 Home equity lines of credit 4,632 — Repurchased pursuant to representations and warranties 12,920 8,915 $ 4,148,425 $ 1,643,957 Loans pledged to secure: Assets sold under agreements to repurchase $ 4,070,134 $ 1,436,437 Mortgage loan participation purchase and sale agreements — 185,442 $ 4,070,134 $ 1,621,879 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 transfers 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 ranging from two to three and one-half

Loans at Fair Value

Loans at Fair Value	12 Months Ended
	Dec. 31, 2019
Mortgage Loans At Fair Value [Abstract]
Loans at Fair Value	Note 10—Loans at Fair Value Loans at fair value are comprised of loans that are not acquired for sale and, to the extent they are not held in a VIE securing an asset-backed financing, 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: December 31, 2019 December 31, 2018 Loan type Fair value Unpaid principal balance Fair value Unpaid principal balance (in thousands) Fixed interest rate jumbo loans held in a VIE $ 256,367 $ 251,425 $ 290,573 $ 294,617 Distressed loans: Nonperforming 11,247 28,852 88,926 157,991 Performing 3,179 6,202 28,806 43,043 14,426 35,054 117,732 201,034 $ 270,793 $ 286,479 $ 408,305 $ 495,651 Loans at fair value pledged to secure: Assets sold under agreements to repurchase $ 12,390 $ 108,693 Asset-backed financing of a VIE at fair value 256,367 290,573 $ 268,757 $ 399,266

Derivative and Credit Risk Tran

Derivative and Credit Risk Transfer Strips Assets	12 Months Ended
	Dec. 31, 2019
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative and Credit Risk Transfer Strips Assets	Note 11— Derivative and Credit Risk Transfer Strip Assets Derivative and credit risk transfer assets are summarized below: December 31, 2019 December 31, 2018 (in thousands) Derivative assets $ 147,388 $ 167,165 Credit risk transfer strips 54,930 — $ 202,318 $ 167,165 Credit Risk Transfer Strips Following is a summary of the Company’s investment in CRT strips: December 31, 2019 Credit risk transfer strips contractually restricted from sale (1) (in thousands) Through June 13, 2020 $ 17,629 To maturity 37,301 $ 54,930 CRT strips pledged to secure Assets sold under agreements to repurchase and Notes payable $ 54,930 (1) The terms of the agreement underlying the CRT securities restricts sales of the securities, other than sales under agreements to repurchase, without the approval of Fannie Mae, for specified periods from the date of issuance. Derivative Notional Amounts and Fair Value of Derivatives The Company had the following derivative assets and liabilities recorded within Derivative assets Derivative liabilities Other December 31, 2019 December 31, 2018 Fair value Fair value Notional Derivative Derivative Notional Derivative Derivative Instrument amount assets liabilities amount assets liabilities (in thousands) Not subject to master netting arrangements: CRT derivatives 24,824,616 $ 115,863 $ — 29,934,003 $ 123,987 $ — Interest rate lock commitments 3,199,680 11,726 572 1,688,516 12,162 174 Repurchase agreement derivatives 5,275 — 14,511 — Subject to master netting agreements ─ economic hedging purposes: Forward purchase contracts 5,883,198 7,525 3,600 3,072,223 14,845 43 Forward sale contracts 9,297,179 637 15,644 4,595,241 13 29,273 MBS put options 4,000,000 1,625 — 2,550,000 218 — MBS call options — — — 500,000 945 — Call options on interest rate futures 2,662,500 3,809 — 512,500 5,137 — Put options on interest rate futures 950,000 2,859 — 1,102,500 178 — Swap futures 2,075,000 4,347 — — — — Swaptions 2,700,000 — — — — — Bond futures 114,500 — — 815,000 — — Total derivative instruments before netting 153,666 19,816 171,996 29,490 Netting (6,278 ) (13,393 ) (4,831 ) (23,576 ) $ 147,388 $ 6,423 $ 167,165 $ 5,914 Margin deposits placed with derivatives counterparties, net $ 7,114 $ 18,744 Derivative assets pledged to secure: Notes payable $ 115,110 $ — Assets sold under agreements to repurchase $ 27,073 $ 87,976 The following tables summarize the notional amount activity for derivative contracts used for economic hedging purposes: Notional amounts, year ended December 31, 2019 Beginning Dispositions/ End Instrument of year Additions expirations of year (in thousands) Forward purchase contracts 3,072,223 246,730,665 (243,919,690 ) 5,883,198 Forward sales contracts 4,595,241 322,636,252 (317,934,314 ) 9,297,179 MBS put options 2,550,000 56,150,000 (54,700,000 ) 4,000,000 MBS call options 500,000 13,200,000 (13,700,000 ) — Call options on interest rate futures 512,500 30,752,000 (28,602,000 ) 2,662,500 Put options on interest rate futures 1,102,500 31,662,400 (31,814,900 ) 950,000 Swap futures — 5,371,970 (3,296,970 ) 2,075,000 Swaptions — 3,700,000 (1,000,000 ) 2,700,000 Bond futures 815,000 23,330,100 (24,030,600 ) 114,500 Notional amounts, year ended December 31, 2018 Beginning Dispositions/ End Instrument of year Additions expirations of year (in thousands) Forward purchase contracts 1,996,235 97,737,906 (96,661,918 ) 3,072,223 Forward sales contracts 2,565,271 129,544,573 (127,514,603 ) 4,595,241 MBS put options 2,375,000 9,575,000 (9,400,000 ) 2,550,000 MBS call options — 2,000,000 (1,500,000 ) 500,000 Call options on interest rate futures — 3,487,500 (2,975,000 ) 512,500 Put options on interest rate futures 550,000 13,302,500 (12,750,000 ) 1,102,500 Swap futures 275,000 — (275,000 ) — Bond futures — 5,274,400 (4,459,400 ) 815,000 Eurodollar future sale contracts 937,000 149,597 (1,086,597 ) — Notional amounts, year ended December 31, 2017 Beginning Dispositions/ End Instrument of year Additions expirations of year (in thousands) Forward purchase contracts 4,840,707 71,768,061 (74,612,533 ) 1,996,235 Forward sales contracts 6,148,242 95,889,432 (99,472,403 ) 2,565,271 MBS put options 925,000 9,225,000 (7,775,000 ) 2,375,000 MBS call options 750,000 550,000 (1,300,000 ) — Call options on interest rate futures 200,000 825,000 (1,025,000 ) — Put options on interest rate futures 550,000 7,150,000 (7,150,000 ) 550,000 Swap futures 150,000 1,650,000 (1,525,000 ) 275,000 Eurodollar future sale contracts 1,351,000 404,000 (818,000 ) 937,000 Treasury future buy contracts — 110,700 (110,700 ) — Treasury future sale contracts — 110,700 (110,700 ) — 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 December 31, 2019 and December 31, 2018, 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. December 31, 2019 December 31, 2018 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 Not subject to master netting arrangements: CRT derivatives $ 115,863 $ — $ 115,863 $ 123,987 $ — $ 123,987 Interest rate lock commitments 11,726 — 11,726 12,162 — 12,162 Repurchase agreement derivatives 5,275 — 5,275 14,511 — 14,511 132,864 — 132,864 150,660 — 150,660 Subject to master netting arrangements: Forward purchase contracts 7,525 — 7,525 14,845 — 14,845 Forward sale contracts 637 — 637 13 — 13 MBS put options 1,625 — 1,625 218 — 218 MBS call options — — — 945 — 945 Call options on interest rate futures 3,809 — 3,809 5,137 — 5,137 Put options on interest rate futures 2,859 — 2,859 178 — 178 Swap futures 4,347 — 4,347 — — — Netting — (6,278 ) (6,278 ) — (4,831 ) (4,831 ) 20,802 (6,278 ) 14,524 21,336 (4,831 ) 16,505 $ 153,666 $ (6,278 ) $ 147,388 $ 171,996 $ (4,831 ) $ 167,165 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. December 31, 2019 December 31, 2018 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 $ 115,863 $ — $ — $ 115,863 $ 123,987 $ — $ — $ 123,987 Interest rate lock commitments 11,726 — — 11,726 12,162 — — 12,162 RJ O’Brien & Associates, LLC 6,668 — — 6,668 5,315 — — 5,315 Deutsche Bank Securities LLC 5,398 — — 5,398 14,511 — — 14,511 Bank of America, N.A. 2,489 — — 2,489 — — — — Wells Fargo Securities, LLC 1,882 — — 1,882 2,800 — — 2,800 J.P. Morgan Securities LLC 1,551 — — 1,551 107 — — 107 Morgan Stanley & Co. LLC 821 — — 821 243 — — 243 Federal National Mortgage Association — — — — 5,619 — — 5,619 Citigroup Global Markets Inc. — — — — 971 — — 971 Other 990 — — 990 1,450 — — 1,450 $ 147,388 $ — $ — $ 147,388 $ 167,165 $ — $ — $ 167,165 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. December 31, 2019 December 31, 2018 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: Not subject to master netting arrangements — Interest rate lock commitments $ 572 $ — $ 572 $ 174 $ — $ 174 Subject to master netting arrangements: Forward purchase contracts 3,600 — 3,600 43 — 43 Forward sales contracts 15,644 — 15,644 29,273 — 29,273 Netting — (13,393 ) (13,393 ) — (23,576 ) (23,576 ) 19,244 (13,393 ) 5,851 29,316 (23,576 ) 5,740 19,816 (13,393 ) 6,423 29,490 (23,576 ) 5,914 Assets sold under agreements to repurchase: UPB 6,649,179 — 6,649,179 4,777,486 — 4,777,486 Unamortized debt issuance costs (289 ) — (289 ) (459 ) — (459 ) 6,648,890 — 6,648,890 4,777,027 — 4,777,027 $ 6,668,706 $ (13,393 ) $ 6,655,313 $ 4,806,517 $ (23,576 ) $ 4,782,941 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. December 31, 2019 December 31, 2018 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 $ 572 $ — $ — $ 572 $ 174 $ — $ — $ 174 J.P. Morgan Securities LLC 1,736,829 (1,736,829 ) — — 1,441,934 (1,441,934 ) — — Bank of America, N.A. 1,339,291 (1,339,291 ) — — 1,307,923 (1,307,584 ) — 339 Daiwa Capital Markets 906,439 (906,439 ) — — 254,332 (254,332 ) — — Credit Suisse Securities (USA) LLC 720,411 (719,902 ) — 509 512,662 (512,662 ) — — Morgan Stanley & Co. LLC 656,728 (656,728 ) — — 105,366 (105,366 ) — — Citigroup Global Markets Inc. 412,999 (411,933 ) — 1,066 99,626 (98,644 ) — 982 Mizuho Securities 392,038 (391,627 ) — 411 270,708 (270,708 ) — — RBC Capital Markets, L.P. 290,388 (290,388 ) — — 57,795 (57,795 ) — — BNP Paribas 116,155 (115,733 ) — 422 162,636 (162,357 ) — 279 Amherst Pierpont Securities LLC 80,309 (80,309 ) — — — — — — Federal National Mortgage Association 1,996 — — 1,996 12 — — 12 Deutsche Bank Securities LLC — — — — 495,974 (495,974 ) — — Wells Fargo Securities, LLC — — — — 70,130 (70,130 ) — — Other 1,447 — — 1,447 4,128 — — 4,128 $ 6,655,602 $ (6,649,179 ) $ — $ 6,423 $ 4,783,400 $ (4,777,486 ) $ — $ 5,914 Following are the net gains (losses) recognized by the Company on derivative financial instruments and the consolidated statements of income line items where such gains and losses are included: Year ended December 31, Derivative activity Income statement line 2019 2018 2017 (in thousands) Interest rate lock commitments Net gain on loans acquired for sale $ (834 ) $ 7,356 $ 81,309 CRT derivatives Net gain on investments $ 70,048 $ 112,275 $ 134,761 Repurchase agreement derivatives Interest expense $ 24 $ 191 $ 116 Hedged item: Interest rate lock commitments and loans acquired for sale Net gain on loans acquired for sale $ (91,084 ) $ 25,334 $ (31,245 ) Mortgage servicing rights Net loan servicing fees $ 80,622 $ (35,550 ) $ (2,512 ) Fixed-rate assets and LIBOR- indexed repurchase agreements Net gain on investments $ 28,785 $ (4,152 ) $ (18,468 )

Real Estate Acquired in Settlem

Real Estate Acquired in Settlement of Loans	12 Months Ended
	Dec. 31, 2019
Other Real Estate [Abstract]
Real Estate Acquired in Settlement of Loans	Note 12—Real Estate Acquired in Settlement of Loans Following is a summary of financial information relating to REO: Year ended December 31, 2019 2018 2017 (in thousands) Balance at beginning of year $ 85,681 $ 162,865 $ 274,069 Transfers: From loans at fair value and advances 23,672 32,578 87,202 From real estate held for investment (1) 30,432 3,401 — To real estate held for investment — (5,183 ) (16,530 ) Results of REO: Valuation adjustments, net (6,527 ) (17,323 ) (27,505 ) Gain on sale, net 7,298 8,537 12,550 771 (8,786 ) (14,955 ) Sales (74,973 ) (99,194 ) (166,921 ) Balance at end of year $ 65,583 $ 85,681 $ 162,865 December 31, 2019 December 31, 2018 (in thousands) REO pledged to secure assets sold under agreements to repurchase $ 40,938 $ 1,939 REO held in a consolidated subsidiary whose stock is pledged to secure financings of such properties — 38,259 $ 40,938 $ 40,198 (1) During the quarter ended June 30, 2019, the Company committed to liquidate its real estate held for investment and transferred its holdings to real estate acquired in settlement of loans.

Mortgage Servicing Rights

Mortgage Servicing Rights	12 Months Ended
	Dec. 31, 2019
Text Block [Abstract]
Mortgage Servicing Rights	Note 13—Mortgage Servicing Rights Carried at Fair Value: Following is a summary of MSRs carried at fair value: Year ended December 31, 2019 2018 2017 (in thousands) Balance at beginning of year $ 1,162,369 $ 91,459 $ 64,136 Transfer of mortgage servicing rights from mortgage servicing rights carried at lower of amortized cost or fair value pursuant to a change in accounting principle — 773,035 — Balance after reclassification 1,162,369 864,494 64,136 Purchases — — 79 Sales (17 ) (100 ) — MSRs resulting from loan sales 837,706 356,755 41,379 Changes in fair value: Due to changes in valuation inputs used in valuation model (1) (262,031 ) 60,772 (9,762 ) Other changes in fair value (2) (202,322 ) (119,552 ) (4,373 ) (464,353 ) (58,780 ) (14,135 ) Balance at end of year $ 1,535,705 $ 1,162,369 $ 91,459 December 31, 2019 December 31, 2018 (in thousands) Fair value of mortgage servicing rights pledged to secure Assets sold under agreements to repurchase and $ 1,510,651 $ 1,139,582 (1) Primarily reflects changes in pricing spread (discount rate) and prepayment speed inputs, primarily due to changes in market interest rates. (2) Represents changes due to realization of expected cash flows. Servicing fees relating to MSRs are recorded in Net loan servicing fees - from nonaffiliates Year ended December 31, 2019 2018 2017 (in thousands) Contractually-specified servicing fees $ 295,390 $ 204,663 $ 164,776 Ancillary and other fees: Late charges 1,658 974 718 Other 22,441 7,088 5,805 $ 319,489 $ 212,725 $ 171,299 Carried at Lower of Amortized Cost or Fair Value: Following is a summary of MSRs carried at lower of amortized cost or fair value: Year ended December 31, 2018 2017 (in thousands) Amortized cost: Balance at beginning of year $ 772,870 $ 606,103 Transfer of mortgage servicing right to mortgage servicing rights carried at fair value pursuant to a change in accounting principle (772,870 ) — Balance after reclassification — 606,103 MSRs resulting from mortgage loan sales — 248,930 Amortization — (81,624 ) Sales — (539 ) Balance at end of year — 772,870 Valuation allowance: Balance at beginning of year (19,548 ) (13,672 ) Reduction pursuant to a change in accounting principle 19,548 — Balance after reclassification — (13,672 ) Additions to valuation allowance — (5,876 ) Balance at end of year — (19,548 ) MSRs, net $ — $ 753,322 Fair value at beginning of year $ 626,334 Fair value at end of year $ 772,940

Assets Sold Under Agreements to

Assets Sold Under Agreements to Repurchase	12 Months Ended
	Dec. 31, 2019
Brokers And Dealers [Abstract]
Assets Sold Under Agreements to Repurchase	Note 14—Assets Sold Under Agreements to Repurchase Following is a summary of financial information relating to assets sold under agreements to repurchase: Year ended December 31, 2019 2018 2017 (dollars in thousands) Weighted average interest rate (1) 3.25 % 3.25 % 2.49 % Average balance $ 5,600,469 $ 3,901,772 $ 3,332,084 Total interest expense (2) $ 178,211 $ 115,383 $ 93,580 Maximum daily amount outstanding $ 8,577,065 $ 6,665,118 $ 4,242,600 (1) Excludes the effect of amortization of net debt issuance premiums of $4.0 million and $11.7 million for the years ended December 31, 2019 and 2018, respectively, and net debt issuance costs of $8.3 million for the year ended December 31, 2017. (2) The Company’s interest expense relating to assets sold under agreements to repurchase for the years ended December 31, 2019, 2018, and 2017 includes recognition of incentives it received for financing certain of its loans acquired for sale satisfying certain consumer debt relief characteristics under a master repurchase agreement. During the years ended December 31, 2019, 2018, and 2017, the Company recognized $10.8 million, $19.7 million, and $3.1 million, respectively, in such incentives as a reduction of interest expense. The master repurchase agreement expired on August 21, 2019. December 31, 2019 December 31, 2018 (dollars in thousands) Carrying value: Unpaid principal balance $ 6,649,179 $ 4,777,486 Unamortized debt issuance costs, net (289 ) (459 ) $ 6,648,890 $ 4,777,027 Weighted average interest rate 2.85 % 3.38 % Available borrowing capacity (1): Committed $ — $ 783,415 Uncommitted 2,278,264 2,325,246 $ 2,278,264 $ 3,108,661 Margin deposits placed with counterparties included in Other $ 91,871 $ 43,676 Assets securing agreements to repurchase: Mortgage-backed securities $ 2,839,633 $ 2,610,422 Loans acquired for sale at fair value $ 4,070,134 $ 1,436,437 Loans at fair value $ 12,390 $ 108,693 CRT strips $ 27,073 $ — CRT derivatives $ — $ 87,976 Real estate acquired in settlement of loans $ 40,938 $ 40,198 Real estate held for investment $ — $ 23,262 MSRs (2) $ 1,354,907 $ 1,139,582 Deposits securing CRT arrangements $ 445,194 $ 1,146,501 (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 Freddie Mac and Fannie Mae MSRs are pledged as collateral under both Assets sold under agreements to repurchase . Following is a summary of maturities of outstanding advances under repurchase agreements by maturity date: Remaining maturity at December 31, 2019 Unpaid principal balance (in thousands) Within 30 days $ 3,322,037 Over 30 to 90 days 3,036,754 Over 90 days to 180 days 290,388 Over 180 days to one year — $ 6,649,179 Weighted average maturity (in months) 1.4 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 December 31, 2019 : Loans, REO and MSRs Counterparty Amount Weighted average maturity Facility maturity (in thousands) Citibank, N.A. $ 283,315 March 22, 2020 August 4, 2020 Credit Suisse First Boston Mortgage Capital LLC $ 227,577 March 18, 2020 April 24, 2020 JPMorgan Chase & Co. $ 84,911 February 18, 2020 October 9, 2020 Bank of America, N.A. $ 43,604 January 30, 2020 March 12, 2020 Morgan Stanley $ 41,672 March 17, 2020 August 21, 2020 Royal Bank of Canada $ 15,902 April 13, 2020 February 28, 2020 BNP Paribas $ 6,370 March 16, 2020 July 31, 2020 Securities Counterparty Amount at risk Weighted average maturity (in thousands) JPMorgan Chase & Co. $ 22,279 January 21, 2020 Bank of America, N.A. $ 12,078 January 14, 2020 Daiwa Capital Markets America Inc. $ 28,234 January 17, 2020 Mizuho Securities $ 12,214 January 11, 2020 Amherst Pierpont Securities LLC $ 2,404 February 14, 2020 CRT arrangements Counterparty Amount at risk Weighted average maturity (in thousands) JPMorgan Chase & Co. $ 88,089 January 31, 2020

Mortgage Loan Participation Pur

Mortgage Loan Participation Purchase and Sale Agreements	12 Months Ended
	Dec. 31, 2019
Text Block [Abstract]
Mortgage Loan Participation Purchase and Sale Agreements	Note 15—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: Year ended December 31, 2019 2018 2017 (dollars in thousands) Weighted average interest rate (1) 3.53 % 3.42 % 2.34 % Average balance $ 40,036 $ 64,512 $ 61,807 Total interest expense $ 1,570 $ 2,422 $ 1,593 Maximum daily amount outstanding $ 207,065 $ 287,862 $ 136,854 (1) Excludes the effect of amortization of debt issuance costs of $158,000, $217,000 and $125,000 for the years ended December 31, 2019, 2018 and 2017, respectively. December 31, 2018 (dollars in thousands) Carrying value: Amount outstanding $ 178,726 Unamortized debt issuance costs (87 ) $ 178,639 Weighted average interest rate 3.77 % Loans acquired for sale pledged to secure mortgage loan participation purchase and sale agreements $ 185,442

Notes Payable

Notes Payable	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Notes Payable	Note 16—Notes Payable On October 16, 2019, the Company, through an indirect subsidiary, PMT CREDIT RISK TRANSFER TRUST 2019-3R, issued an aggregate principal amount of $375.0 million in secured term notes (the “2019-3R Notes”) to qualified institutional buyers under Rule 144A of the Securities Act of 1933, as amended (the “Securities Act”). The 2019-3R Notes bear interest at a rate equal to one-month LIBOR plus 2.70% per annum, with an initial payment date of November 27, 2019 and, with respect to each calendar month thereafter, a payment date that shall occur on the second business day following the latest underlying payment date of all of the underlying series in that calendar month. The 2019-3R Notes mature on October 27, 2022 or, if extended pursuant to the terms of the related indenture, October 29, 2024 (unless earlier redeemed in accordance with their terms). On June 11, 2019, the Company, through its indirect subsidiary, PMT CREDIT RISK TRANSFER TRUST 2019-2R, issued an aggregate principal amount of $638.0 million in secured term notes (the “2019-2R Notes”) to qualified institutional buyers under Rule 144A of the Securities Act. The 2019-2R Notes bear interest at a rate equal to one-month LIBOR plus 2.75% per annum, with an initial payment date of June 27, 2019 and, with respect to each calendar month thereafter, a payment date that shall occur on the second business day following the latest underlying payment date of all of the underlying series in that calendar month. The 2019-2R Notes mature on May 29, 2023 or, if extended pursuant to the terms of the related indenture, June 28, 2025 (unless earlier redeemed in accordance with their terms). On March 29, 2019, the Company, through its indirect subsidiary, PMT CREDIT RISK TRANSFER TRUST 2019-1R, issued an aggregate principal amount of $295.7 million in secured term notes (the “2019-1R Notes”) to qualified institutional buyers under Rule 144A of the Securities Act. The 2019-1R Notes bear interest at a rate equal to one-month LIBOR plus 2.00% per annum, with an initial payment date that occurred on April 29, 2019 and, with respect to each calendar month thereafter, a payment date that shall occur on the second business day following the latest underlying payment date of all of the underlying series in that calendar month. The 2019-1R Notes mature on March 27, 2022 or, if extended pursuant to the terms of the related indenture, March 29, 2024 (unless earlier redeemed in accordance with their terms). 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, payable each month beginning in May 2018, on the 25th day of such month or, if such 25th day is not a business day, the next business day. The 2018-FT1 Notes mature on April 25, 2023 or, if extended pursuant to the terms of the related term note indenture supplement, April 25, 2025 (unless earlier redeemed in accordance with their terms). The 2018-FT1 Notes rank pari passu with the Series 2017-VF1 Note dated December 20, 2017 (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. On February 1, 2018, the Company, through PMC and PMH, entered into a Loan and Security Agreement with Credit Suisse First Boston Mortgage Capital LLC, 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 (collectively, the “Freddie MSRs”), in an aggregate loan amount not to exceed $175 million. The note matures on February 1, 2020. On March 24, 2017, the Company, through PMC and PMH, entered into a Loan and Security Agreement with Barclays Bank PLC, 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 (collectively, the “Freddie MSRs”), in an aggregate loan amount not to exceed $170 million. The note matured and was repaid on February 1, 2018. Following is a summary of financial information relating to the notes payable: Year ended December 31, 2019 2018 2017 (dollars in thousands) Weighted average interest rate (1) 4.70 % 4.68 % 5.71 % Average balance $ 1,101,501 $ 300,035 $ 145,638 Total interest expense $ 53,968 $ 14,623 $ 12,634 Maximum daily amount outstanding $ 1,742,227 $ 450,000 $ 275,106 (1) Excludes the effect of amortization of debt issuance costs of $2.2 million, $681,000 and $4.2 million for the years ended December 31, 2019, 2018 and 2017, respectively. December 31, 2019 December 31, 2018 (dollars in thousands) Carrying value: Amount outstanding $ 1,702,262 $ 450,000 Unamortized debt issuance costs (5,967 ) (4,427 ) $ 1,696,295 $ 445,573 Weighted average interest rate 4.30 % 4.86 % Assets securing notes payable: MSRs (1) $ 1,510,651 $ 1,139,582 CRT Agreements: Deposits securing CRT arrangements $ 1,524,590 $ — Derivative assets $ 115,110 $ — (1) Beneficial interests in Freddie Mac and Fannie Mae MSRs are pledged as collateral for both Assets sold under agreements to repurchase .

Exchangeable Senior Notes

Exchangeable Senior Notes	12 Months Ended
	Dec. 31, 2019
Text Block [Abstract]
Exchangeable Senior Notes	Note 17—Exchangeable Notes On November 4, 2019, PMC issued $210.0 million in principal amount of 5.50% exchangeable senior notes due 2024 (the “2024 Notes”) in a private offering. The 2024 Notes will mature on November 1, 2024 unless repurchased or exchanged in accordance with their terms before such date. The 2024 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 initially equals 40.1010 common shares per $1,000 principal amount of the 2024 Notes and is subject to adjustment upon the occurrence of certain events, but will not be adjusted for any accrued and unpaid interest. PMC issued in a private offering $250 million aggregate principal amount of exchangeable senior notes (the “2020 Notes”, together with the 2024 Exchangeable Notes, the “Exchangeable Notes”) due May 1, 2020. The 2020 Notes bear interest at a rate of 5.375% per year, payable semiannually. The 2020 Exchangeable Notes are exchangeable into common shares of the Company at a rate of 33.8667 common shares per $1,000 principal amount of the 2020 Notes as of December 31, 2019, which is an increase over the initial exchange rate of 33.5149. The increase in the calculated exchange rate was the result of quarterly cash dividends exceeding the quarterly dividend threshold amount of $0.57 per share, as provided in the related indenture. Following is financial information relating to the Exchangeable Notes: Year ended December 31, 2019 2018 2017 (in thousands) Average balance $ 279,207 $ 250,000 $ 250,000 Total interest expense $ 17,037 $ 14,601 $ 14,535 December 31, 2019 December 31, 2018 (in thousands) Carrying value: UPB $ 460,000 $ 250,000 Unamortized debt issuance costs and conversion option (16,494 ) (1,650 ) $ 443,506 $ 248,350

Asset-Backed Financing of a Var

Asset-Backed Financing of a Variable Interest Entity at Fair Value	12 Months Ended
	Dec. 31, 2019
Text Block [Abstract]
Asset-Backed Financing of a Variable Interest Entity at Fair Value	Note 18—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: Year ended December 31, 2019 2018 2017 (dollars in thousands) Average balance $ 267,539 $ 288,244 $ 331,409 Total interest expense $ 11,324 $ 10,821 $ 13,184 Weighted average interest rate (1) 3.46 % 3.55 % 3.39 % (1) Excludes the effect of debt issuance costs of $2.1 million, $577,000 and $1.8 million, for the year ended December 31, 2019, 2018 and 2017, respectively. December 31, 2019 December 31, 2018 (dollars in thousands) Fair value $ 243,360 $ 276,499 UPB $ 239,169 $ 281,922 Weighted average interest rate 3.51 % 3.51 % 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.

Liability for Losses Under Repr

Liability for Losses Under Representations and Warranties	12 Months Ended
	Dec. 31, 2019
Liability For Representations And Warranties [Abstract]
Liability for Losses Under Representations and Warranties	Note 19—Liability for Losses Under Representations and Warranties Following is a summary of the Company’s liability for losses under representations and warranties: Year ended December 31, 2019 2018 2017 (in thousands) Balance, beginning of year $ 7,514 $ 8,678 $ 15,350 Provision for losses: Pursuant to loan sales 3,778 2,531 3,147 Reduction in liability due to change in estimate (3,550 ) (3,707 ) (9,679 ) (Losses incurred) recoveries, net (128 ) 12 (140 ) Balance, end of year $ 7,614 $ 7,514 $ 8,678 UPB of loans subject to representations and warranties at end of year $ 122,163,186 $ 90,427,100 $ 71,416,333

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2019
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 20—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: December 31, 2019 (in thousands) Commitments to purchase loans acquired for sale $ 3,199,680 Face amount of firm commitment to purchase credit risk transfer securities $ 1,502,203

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2019
Equity [Abstract]
Shareholders' Equity	Note 21—Shareholders’ Equity Preferred Shares of Beneficial Interest Preferred shares of beneficial interest are summarized below: Dividends per share, year ended December 31, Series Description (1) Number of shares Liquidation preference Issuance discount Carrying value 2019 2018 2017 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 $ 2.03 $ 2.03 $ 1.59 B 8.00% Issued July 2017 7,800 195,000 6,465 188,535 $ 2.00 $ 2.00 $ 0.89 12,400 $ 310,000 $ 10,293 $ 299,707 (1) Par value is $0.01 per share. During March 2017, the Company issued 4.6 million of its 8.125% Series A Fixed-to-Floating Rate Cumulative Redeemable Preferred Shares of Beneficial Interest, $0.01 par value per share (the “Series A Preferred Shares”). From, and including, the date of original issuance to, but not including, March 15, 2024, the Company pays cumulative dividends on the Series A Preferred Shares at a fixed rate of 8.125% per annum based on the $25.00 per share liquidation preference. 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. During July 2017, the Company issued 7.8 million of its 8.00% Series B Fixed-to-Floating Rate Cumulative Redeemable Preferred Shares of Beneficial Interest, $0.01 par value per share (the “Series B Preferred Shares” and, together with the Series A Preferred Shares, the “Preferred Shares”). From, and including, the date of original issuance to, but not including, June 15, 2024, the Company pays cumulative dividends on the Series B Preferred Shares at a fixed rate of 8.00% per annum based on the $25.00 per share liquidation preference. 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 Company pays quarterly cumulative dividends on the Preferred Shares on the 15th day of each March, June, September and December, provided that if any dividend payment date is not a business day, then the dividend that would otherwise be payable on that dividend payment date may be paid on the following business day. 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 occurs, 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 Underwritten Equity Offerings During 2019, the Company completed the following underwritten offerings of common shares: Date Number of common shares Average price per share Gross proceeds Net proceeds (Amounts in thousands, except average price per share) February 14, 2019 7,000 $ 20.64 $ 144,480 $ 142,470 May 9, 2019 8,127 $ 21.15 171,877 169,605 August 8, 2019 9,200 $ 21.75 200,100 197,773 December 13, 2019 9,200 $ 22.10 203,320 200,904 33,527 $ 21.47 $ 719,777 $ 710,752 “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 $200,000,000. Quarter ended Number of common shares Average price per share Gross proceeds Net proceeds (Amounts in thousands, except average price per share) March 31, 2019 221 $ 20.76 $ 4,588 $ 4,542 June 30, 2019 2,068 $ 21.68 $ 44,844 $ 44,395 September 30, 2019 2,537 $ 22.17 $ 56,256 $ 55,694 December 31, 2019 637 $ 22.32 $ 14,217 $ 14,074 5,463 $ 21.95 $ 119,905 $ 118,705 Common Share Repurchases 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. The following table summarizes the Company’s share repurchase activity: Year ended December 31, Cumulative 2018 2017 2016 2015 total (1) (in thousands) Common shares repurchased 671 5,647 7,368 1,045 14,731 Cost of common shares repurchased $ 10,719 $ 91,198 $ 98,370 $ 16,338 $ 216,625 (1) Amounts represent the share repurchase program total from its inception in August 2015 through December 31, 2019. The repurchased common shares were canceled upon settlement of the repurchase transactions and returned to the authorized but unissued common share pool. Conditional Reimbursement of IPO Underwriting Costs As more fully described in Note 4— Transactions with Related Parties The Reimbursement Agreement also provides for the payment to the IPO underwriters of the amount that the Company agreed to pay to them at the time of the IPO if the Company satisfied certain performance measures over a specified period. As the Manager earns performance incentive fees under the management agreement, the IPO underwriters will be paid at a rate of $20 of payments for every $100 of performance incentive fees earned by PCM. The Reimbursement Agreement was amended and now expires on February 1, 2023. The Company made payments under the Reimbursement Agreement totaling $580,000, $137,000 and $61,000 during the years ended December 31, 2019, 2018 and 2017, respectively. During the year ended December 31, 2019, certain of the IPO underwriters waived their rights to approximately $1.1 million of conditional underwriting fees. The Company recorded the reduction of conditional underwriting fees in Other

Net Gain on Investments

Net Gain on Investments	12 Months Ended
	Dec. 31, 2019
Investments Debt And Equity Securities [Abstract]
Net Gain (Loss) on Investments	Note 22—Net Gain on Investments Net gain on investments is summarized below: Year ended December 31, 2019 2018 2017 (in thousands) From nonaffiliates: Mortgage-backed securities $ 77,283 $ (11,262 ) $ 5,498 Loans at fair value: Held in a VIE 7,883 (8,499 ) 4,266 Distressed (7,169 ) (15,197 ) (684 ) CRT arrangements 110,676 92,943 123,728 Firm commitment to purchase CRT securities 60,943 7,399 — Asset-backed financing of a VIE at fair value (7,553 ) 9,610 (3,426 ) Hedging derivatives 28,785 (4,152 ) (18,468 ) 270,848 70,842 110,914 From PFSI—ESS (7,530 ) 11,084 (14,530 ) $ 263,318 $ 81,926 $ 96,384

Net Gain on Loans Acquired for

Net Gain on Loans Acquired for Sale	12 Months Ended
	Dec. 31, 2019
Text Block [Abstract]
Net Gain on Loans Acquired for Sale	Note 23—Net Gain on Loans Acquired for Sale Net gain on loans acquired for sale is summarized below: Year ended December 31, 2019 2018 2017 (in thousands) From nonaffiliates: Cash loss: Loans $ (687,317 ) $ (363,271 ) $ (209,898 ) Hedging activities (88,633 ) 9,172 (15,288 ) (775,950 ) (354,099 ) (225,186 ) Non-cash gain: Recognition of fair value of firm commitment to purchase CRT securities 99,305 30,595 — Receipt of MSRs in mortgage loan sale transactions 837,706 356,755 290,309 Provision for losses relating to representations and warranties provided in mortgage loan sales: Pursuant to loans sales (3,778 ) (2,531 ) (3,147 ) Reduction in liability due to change in estimate 3,550 3,707 9,679 (228 ) 1,176 6,532 Change in fair value of loans and derivatives held at end of year: IRLCs (834 ) 7,356 855 Loans (1,765 ) (9,685 ) 5,879 Hedging derivatives (2,451 ) 16,162 (15,957 ) (5,050 ) 13,833 (9,223 ) 931,733 402,359 287,618 Total from nonaffiliates 155,783 48,260 62,432 From PFSI—cash gain 14,381 10,925 12,084 $ 170,164 $ 59,185 $ 74,516

Net Loan Servicing Fees

Net Loan Servicing Fees	12 Months Ended
	Dec. 31, 2019
Mortgage Loan Servicing Fees [Abstract]
Net Loan Servicing Fees	Note 24—Net Loan Servicing Fees Net loan servicing fees are summarized below: Year ended December 31, 2019 2018 2017 (in thousands) From nonaffiliates: Contractually specified (1) $ 295,390 $ 204,663 $ 164,776 Other 24,099 8,062 6,523 Effect of MSRs: Carried at fair value: Realization of cashflows (202,322 ) (119,552 ) (9,762 ) Market changes (262,031 ) 60,772 (4,373 ) (464,353 ) (58,780 ) (14,135 ) Carried at lower of amortized cost or fair value: Amortization — — (81,624 ) Increase in impairment valuation allowance — — (5,876 ) Gain on sale — — 660 Gain (losses) on hedging derivatives, net 80,622 (35,550 ) (2,512 ) (383,731 ) (94,330 ) (103,487 ) Net servicing fees from non-affiliates (64,242 ) 118,395 67,812 From PFSI—MSR recapture income 5,324 2,192 1,428 Net loan servicing fees $ (58,918 ) $ 120,587 $ 69,240 Average servicing portfolio $ 110,075,179 $ 80,500,212 $ 63,836,843 (1) Includes contractually specified servicing fees, net of Agency guarantee fees.

Net Interest Income

Net Interest Income	12 Months Ended
	Dec. 31, 2019
Banking And Thrift Interest [Abstract]
Net Interest Income	Note 25—Net Interest Income Net interest income is summarized below: Year ended December 31, 2019 2018 2017 (in thousands) Interest income: From nonaffiliates: Cash and short-term investments $ 4,559 $ 852 $ 576 Mortgage-backed securities 78,450 55,487 29,438 Loans acquired for sale at fair value 121,387 75,610 53,164 Loans at fair value: Held in a VIE 11,734 11,813 14,425 Distressed 3,848 21,666 63,613 Deposits securing CRT arrangements 34,229 15,441 4,291 Placement fees relating to custodial funds 52,587 26,065 12,517 Other 800 700 201 307,594 207,634 178,225 From PFSI—ESS 10,291 15,138 16,951 317,885 222,772 195,176 Interest expense: To nonaffiliates: Assets sold under agreements to repurchase (1) 178,211 115,383 93,580 Mortgage loan participation purchase and sale agreements 1,570 2,422 1,593 Exchangeable Notes 17,037 14,601 14,535 Notes payable 53,968 14,623 12,634 Asset-backed financings of a VIE at fair value 11,324 10,821 13,184 Interest shortfall on repayments of loans serviced for Agency securitizations 25,776 7,324 5,928 Interest on loan impound deposits 3,258 2,535 1,879 291,144 167,709 143,333 To PFSI—Assets sold under agreement to repurchase 6,302 7,462 8,038 297,446 175,171 151,371 Net interest income $ 20,439 $ 47,601 $ 43,805 (1) In 2017, the Company entered into a master repurchase agreement that provides the Company with incentives to finance loans approved for satisfying certain consumer relief characteristics as provided in the agreement. During the years ended December 31, 2019, 2018 and 2017 the Company included $10.8 million, $19.7 million and $3.1 million, respectively, of such incentives as a reduction of Interest expense

Share-Based Compensation Plans

Share-Based Compensation Plans	12 Months Ended
	Dec. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Share-Based Compensation Plans	Note 26—Share-Based Compensation Plans 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 the 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: Year ended December 31, 2019 2018 2017 (in thousands) Grants: Restricted share units 96 129 136 Performance share units 116 116 126 Total share units granted 212 245 262 Grant date fair value: Restricted share units $ 1,978 $ 2,281 $ 2,316 Performance share units 2,380 1,542 1,675 Total grant date value of share units $ 4,358 $ 3,823 $ 3,991 Vestings: Restricted share units 227 261 284 Performance share units (1) 118 27 — Total share units vested 345 288 284 Forfeitures: Restricted share units — 2 13 Performance share units 1 — — Total share units forfeited 1 2 13 Compensation expense relating to share-based grants $ 5,530 $ 5,318 $ 4,904 (1) The actual number of performance-based RSUs vested during the year ended December 31, 2019 was 141,000 common shares, which is approximately 119% of the 118,000 originally granted performance-based RSUs, due to the Company exceeding the established performance targets. December 31, 2019 Restricted share units Performance share units Shares expected to vest: Number of units (in thousands) 229 234 Grant date average fair value per unit $ 19.01 $ 17.28 Average remaining vesting period (months) 8 8

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Note 27—Income Taxes The Company has elected to be taxed as a REIT for U.S. federal income tax purposes under Sections 856 through 860 of the Internal Revenue Code. Therefore, PMT generally will not be subject to corporate federal or state income tax to the extent that qualifying distributions are made to shareholders and the Company meets the REIT requirements including the asset, income, distribution and share ownership tests. The Company believes that it has met the distribution requirements, as it has declared dividends sufficient to distribute substantially all of its taxable income. Taxable income will generally differ from net income. The primary differences between net income and the REIT taxable income (before deduction for qualifying distributions) are the taxable income of the TRS and the method of determining the income or loss related to valuation of the loans owned by the qualified REIT subsidiary. 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 Tax Cuts and Jobs Act (the “Tax Act”) (subject to certain limitations) provides a 20% deduction from taxable income for ordinary REIT dividends. The approximate tax characterization of the Company’s distributions is as follows: Year ended December 31, Ordinary income Long term capital gain Return of capital 2019 66 % 0 % 34 % 2018 49 % 0 % 51 % 2017 71 % 29 % 0 % The Company has elected to treat its subsidiary, PMC, as a TRS. Income from a TRS is only included as a component of REIT taxable income to the extent that the TRS makes dividend distributions of income to the Company. Before 2017, the TRS had made no such distributions to the Company. In 2017, the TRS made a $20 million distribution that resulted in dividend income to the Company. A TRS is subject to corporate federal and state income tax. Accordingly, a provision for income taxes for PMC is included in the consolidated statements of income. The following table details the Company’s (benefit from) provision for income taxes which relates primarily to the TRS for the years presented: Year ended December 31, 2019 2018 2017 (in thousands) Current (benefit) expense : Federal $ (120 ) $ 19 $ 251 State 12 6 57 Total current (benefit) expense (108 ) 25 308 Deferred (benefit) expense: Federal (39,592 ) 7,587 3,824 State 3,984 (2,422 ) 2,665 Total deferred (benefit) expense (35,608 ) 5,165 6,489 Total (benefit from) provision for income taxes $ (35,716 ) $ 5,190 $ 6,797 The following table is a reconciliation of the Company’s (benefit from) provision for income taxes at statutory rates to the (benefit from) provision for income taxes at the Company’s effective rate for the years presented: Year ended December 31, 2019 2018 2017 Amount Rate Amount Rate Amount Rate (dollars in thousands) Federal income tax expense at statutory tax rate $ 40,035 21.0 % $ 33,177 21.0 % $ 43,591 35.0 % Effect of non-taxable REIT income (79,467 ) (41.7 )% (26,647 ) (16.9 )% (25,754 ) (20.7 )% State income taxes, net of federal benefit (7,417 ) (3.9 )% (2,044 ) (1.3 )% 1,687 1.4 % Effect of federal statutory rate change — (— )% — (— )% (12,992 ) (10.4 )% Valuation allowance 13,612 7 % — 0 % — 0 % Other (2,479 ) (1.2 )% 704 0.4 % 265 0.2 % (Benefit from) provision for income taxes $ (35,716 ) (18.8 )% $ 5,190 3.2 % $ 6,797 5.5 % The Company’s tax expense for the year ended December 31, 2017 was significantly impacted by the enactment of the Tax Act on December 22, 2017. The Tax Act reduces the U.S. federal corporate tax rate to 21% from the previous maximum rate of 35%, effective January 1, 2018. GAAP requires that the impact of tax legislation be recognized in the period in which the law was enacted. In 2017, the Company recorded a tax benefit of $13.0 million due to a re-measurement of deferred tax assets and liabilities of the TRS resulting from the decrease in the federal tax rate. The re-measurement of the deferred tax assets and liabilities is predominantly based on the reduction to the Federal rate as described above, which will result in lower tax expense when these deferred tax assets and liabilities are realized. The Company’s components of the (benefit from) provision for deferred income taxes are as follows: Year ended December 31, 2019 2018 2017 (in thousands) Real estate valuation loss $ 1,140 $ 1,565 $ 3,476 Mortgage servicing rights (212 ) 4,797 15,516 Net operating loss carryforward (56,339 ) (1,109 ) 4,333 Liability for losses under representations and warranties 111 405 2,652 Excess interest expense disallowance 4,667 234 (7,304 ) Effect of federal statutory rate change — — (12,992 ) Other 1,413 (727 ) 808 Valuation allowance 13,612 — — Total (benefit from) provision for deferred income taxes $ (35,608 ) $ 5,165 $ 6,489 The components of income taxes payable are as follows: December 31, 2019 December 31, 2018 (in thousands) Taxes currently receivable $ (259 ) $ (1,160 ) Deferred income taxes payable 2,078 37,686 Income taxes payable $ 1,819 $ 36,526 The tax effects of temporary differences that gave rise to deferred income tax assets and liabilities are presented below: December 31, 2019 December 31, 2018 (in thousands) Deferred income tax assets: Net operating loss carryforward $ 97,236 $ 40,897 Excess interest expense disallowance 15,234 19,901 REO valuation loss 1,438 2,578 Liability for losses under representations and warranties 1,900 2,011 Valuation allowance (13,612 ) — Other 162 1,576 Gross deferred tax assets 102,358 66,962 Deferred income tax liabilities: Mortgage servicing rights 104,436 104,648 Other — — Gross deferred tax liabilities 104,436 104,648 Net deferred income tax liability $ 2,078 $ 37,686 The net deferred income tax liability is included in Income taxes payable The Company has net operating loss carryforwards of $365.4 million and $136.8 million at December 31, 2019 and December 31, 2018, respectively. Losses that occurred before 2018 expire between 2033 and 2036. Net operating losses arising in tax years beginning after December 31, 2017 can be carried forward indefinitely but are limited to 80% of taxable income. We evaluated the net deferred tax asset of our TRS and established a deferred tax valuation allowance in the amount of $ 13.6 million. In our evaluation, we consider, among other things, taxable loss carryback availability, expectations of sufficient future taxable income, trends in earnings, existence of taxable income in recent years, the future reversal of temporary differences, and available tax planning strategies that could be implemented, if required. We establish valuation allowances based on the consideration of all available evidence using a more-likely-than-not standard. At December 31, 2019 and December 31, 2018, the Company had no unrecognized tax benefits and does not anticipate any increase in unrecognized tax benefits. Should the accrual of any interest or penalties relative to unrecognized tax benefits be necessary, it is the Company’s policy to record such accruals in the Company’s income tax accounts. No such accruals existed at December 31, 2019 and December 31, 2018. The Company files U.S. federal and state income tax returns for both the REIT and the TRS. These federal income tax returns for 2016 and forward are subject to examination. The Company’s state income tax returns are generally subject to examination for 2015 and forward. The TRS’s Georgia state income tax returns for tax years 2016 through 2018 are currently under examination.

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2019
Earnings Per Share [Abstract]
Earnings Per Share	Note 28—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 Company’s Exchangeable Notes, by the weighted average common shares outstanding, assuming all dilutive securities were issued. The following table summarizes the basic and diluted earnings per share calculations: Year ended December 31, 2019 2018 2017 (in thousands except per share amounts) Net income $ 226,357 $ 152,798 $ 117,749 Dividends on preferred shares (24,938 ) (24,938 ) (15,267 ) Effect of participating securities—share-based compensation awards (566 ) (750 ) (991 ) Net income attributable to common shareholders $ 200,853 $ 127,110 $ 101,491 Net income attributable to common shareholders $ 200,853 $ 127,110 $ 101,491 Interest on Exchangeable Notes, net of income taxes (1) 11,827 10,637 8,757 Diluted net income attributable to common shareholders $ 212,680 $ 137,747 $ 110,248 Weighted average basic shares outstanding 78,990 60,898 66,144 Dilutive securities: Shares issuable under share-based compensation plan 254 — — Shares issuable pursuant to exchange of the Exchangeable Notes (1) 8,467 8,467 8,467 Diluted weighted average number of shares outstanding 87,711 69,365 74,611 Basic earnings per share $ 2.54 $ 2.09 $ 1.53 Diluted earnings per share $ 2.42 $ 1.99 $ 1.48 (1) During 2019, the Company issued the 2024 Notes. The 2024 Notes include a cash conversion option. The Company intends to cash settle the 2024 Exchangeable Notes. Therefore, the effect of conversion of the 2024 Notes is excluded from diluted earnings per share. 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 antidilutive. 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: Year ended December 31, 2019 2018 2017 (in thousands) Shares issuable under share-based compensation plan 152 252 157

Segments

Segments	12 Months Ended
	Dec. 31, 2019
Segment Reporting [Abstract]
Segments	Note 29—Segments 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 CRT arrangements, firm commitments to purchase CRT securities, distressed loans, real estate and non-Agency subordinated bonds. • The interest rate sensitive strategies segment represents the Company’s investments in MSRs, ESS, Agency and senior non-Agency MBS and the related interest rate hedging activities. • The correspondent production segment represents the Company’s operations aimed at serving as an intermediary between mortgage 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 the Manager and PLS. • The corporate segment includes management fees, corporate expense amounts and certain interest income. Financial highlights by operating segment are summarized below: Credit Interest rate sensitive sensitive Correspondent Year ended December 31, 2019 strategies strategies production Corporate Total (in thousands) Net investment income: Net gain on investments $ 164,413 $ 98,905 $ — $ — $ 263,318 Net gain on loans acquired for sale (1) 51,014 119,150 — 170,164 Net loan servicing fees — (58,918 ) — — (58,918 ) Net interest income (expense): Interest income 39,343 155,176 120,974 2,392 317,885 Interest expense (67,412 ) (144,513 ) (85,521 ) — (297,446 ) (28,069 ) 10,663 35,453 2,392 20,439 Other 4,507 — 88,159 1,146 93,812 191,865 50,650 242,762 3,538 488,815 Expenses: Loan fulfillment and servicing fees payable to PFSI 2,213 46,584 160,610 — 209,407 Management fees — — — 36,492 36,492 Other 7,476 2,918 17,559 24,322 52,275 9,689 49,502 178,169 60,814 298,174 Pretax income (loss) $ 182,176 $ 1,148 $ 64,593 $ (57,276 ) $ 190,641 Total assets at year end $ 2,364,749 $ 4,993,840 $ 4,216,806 $ 195,956 $ 11,771,351 (1) During the quarter ended March 31, 2019, the chief operating decision maker began attributing a portion of the initial fair value the Company recognizes relating to its firm commitment to purchase CRT securities upon the sale of loans to the correspondent production segment in recognition of pricing changes in the correspondent production segment. Accordingly, the Company allocated $49.0 million of the initial firm commitment recognized in Net gain on loans acquired for sale Credit Interest rate sensitive sensitive Correspondent Year ended December 31, 2018 strategies strategies production Corporate Total (in thousands) Net investment income: Net gain on investments $ 84,943 $ (3,017 ) $ — $ — $ 81,926 Net gain on loans acquired for sale 30,740 — 28,445 — 59,185 Net loan servicing fees 29 120,558 — — 120,587 Net interest income (expense): Interest income 37,786 108,366 75,068 1,552 222,772 Interest expense (41,523 ) (92,294 ) (41,354 ) — (175,171 ) (3,737 ) 16,072 33,714 1,552 47,601 Other (1,704 ) — 43,447 25 41,768 110,271 133,613 105,606 1,577 351,067 Expenses: Loan fulfillment and servicing fees payable to PFSI 7,561 34,484 81,350 — 123,395 Management fees — — — 24,465 24,465 Other 15,459 697 7,784 21,279 45,219 23,020 35,181 89,134 45,744 193,079 Pretax income (loss) $ 87,251 $ 98,432 $ 16,472 $ (44,167 ) $ 157,988 Total assets at year end $ 1,602,776 $ 4,373,488 $ 1,698,656 $ 138,441 $ 7,813,361 Credit Interest rate sensitive sensitive Correspondent Year ended December 31, 2017 strategies strategies production Corporate Total (in thousands) Net investment income: Net gain on investments $ 123,774 $ (27,390 ) $ — $ — $ 96,384 Net gain on loans acquired for sale 208 — 74,308 — 74,516 Net loan servicing fees 134 69,106 — — 69,240 Net interest income (expense): Interest income 69,008 72,870 52,522 776 195,176 Interest expense (53,434 ) (62,809 ) (35,128 ) — (151,371 ) 15,574 10,061 17,394 776 43,805 Other (6,290 ) — 40,279 6 33,995 133,400 51,777 131,981 782 317,940 Expenses: Loan fulfillment and servicing fees payable to PFSI 15,611 27,446 80,366 — 123,423 Management fees — — — 22,584 22,584 Other 15,575 1,648 8,677 21,487 47,387 31,186 29,094 89,043 44,071 193,394 Pretax income (loss) $ 102,214 $ 22,683 $ 42,938 $ (43,289 ) $ 124,546 Total assets at year end $ 1,791,447 $ 2,414,423 $ 1,302,245 $ 96,818 $ 5,604,933

Selected Quarterly Results

Selected Quarterly Results	12 Months Ended
	Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]
Selected Quarterly Results	Note 30—Selected Quarterly Results (Unaudited) Following is a presentation of selected quarterly financial data: Quarter ended 2019 2018 Dec. 31 Sept. 30 June 30 Mar. 31 Dec. 31 Sept. 30 June 30 Mar. 31 (dollars in thousands, except per share data) Net investment income $ 155,036 $ 130,760 $ 96,401 $ 106,618 $ 83,902 $ 108,501 $ 82,991 $ 75,673 Net income $ 58,597 $ 70,000 $ 44,233 $ 53,527 $ 41,625 $ 46,562 $ 36,425 $ 28,186 Earnings per share: Basic $ 0.56 $ 0.75 $ 0.52 $ 0.73 $ 0.58 $ 0.66 $ 0.49 $ 0.36 Diluted $ 0.55 $ 0.71 $ 0.50 $ 0.68 $ 0.55 $ 0.62 $ 0.47 $ 0.35 Cash dividends declared per share $ 0.47 $ 0.47 $ 0.47 $ 0.47 $ 0.47 $ 0.47 $ 0.47 $ 0.47 At quarter end: Mortgage-backed securities $ 2,839,633 $ 2,325,010 $ 2,600,357 $ 2,589,106 $ 2,610,422 $ 2,126,507 $ 1,698,322 $ 1,436,456 Loans (1) 4,419,218 4,237,895 2,835,837 1,833,735 2,052,262 2,582,600 2,539,963 1,895,023 Excess servicing spread 178,586 183,141 194,156 205,081 216,110 223,275 229,470 236,002 Derivative assets 202,318 274,444 258,782 188,710 167,165 143,577 133,239 122,518 Real estate (2) 65,583 79,201 97,808 114,521 128,791 141,576 155,702 187,296 Deposits securing credit risk transfer arrangements 1,969,784 2,044,250 2,060,612 1,137,283 1,146,501 662,624 651,204 622,330 Mortgage servicing rights 1,535,705 1,162,714 1,126,427 1,156,908 1,162,369 1,109,741 1,010,507 957,013 Other assets 560,524 437,954 291,810 330,643 329,741 277,678 258,442 333,848 Total assets $ 11,771,351 $ 10,744,609 $ 9,465,789 $ 7,555,987 $ 7,813,361 $ 7,267,578 $ 6,676,849 $ 5,790,486 Short-term debt $ 7,005,986 $ 6,713,154 $ 5,483,267 $ 4,378,900 $ 5,081,691 $ 4,452,670 $ 3,630,843 $ 3,366,181 Long-term debt 2,159,286 1,646,349 1,915,465 1,295,949 1,011,433 1,086,841 1,363,886 737,289 Other liabilities 155,164 165,495 123,123 153,549 154,105 169,504 136,633 144,758 Total liabilities 9,320,436 8,524,998 7,521,855 5,828,398 6,247,229 5,709,015 5,131,362 4,248,228 Shareholders’ equity 2,450,915 2,219,611 1,943,934 1,727,589 1,566,132 1,558,563 1,545,487 1,542,258 Total liabilities and shareholders’ equity $ 11,771,351 $ 10,744,609 $ 9,465,789 $ 7,555,987 $ 7,813,361 $ 7,267,578 $ 6,676,849 $ 5,790,486 (1) Includes loans acquired for sale at fair value and loans at fair value. (2) Includes REO and real estate held for investment.

Supplemental Cash Flow Informat

Supplemental Cash Flow Information	12 Months Ended
	Dec. 31, 2019
Supplemental Cash Flow Elements [Abstract]
Supplemental Cash Flow Information	Note 31—Supplemental Cash Flow Information Year ended December 31, 2019 2018 2017 (in thousands) Payments: Income tax, net $ (1,009 ) $ 1,333 $ (2,354 ) Interest $ 298,591 $ 170,435 $ 152,441 Cumulative effect on accumulated deficit of conversion to fair value accounting for mortgage servicing rights $ — $ (14,361 ) $ — Non-cash investing activities: Transfer of loans and advances to real estate acquired in settlement of loans $ 23,672 $ 32,578 $ 87,202 Transfer of real estate acquired in settlement of mortgage loans to real estate held for investment $ — $ 5,183 $ 16,530 Transfer from real estate held for investment to real estate acquired in settlement of loans $ 30,432 $ 3,401 $ — Receipt of mortgage servicing rights as proceeds from sales of loans at fair value $ 837,706 $ 356,755 $ 290,309 Receipt of excess servicing spread pursuant to recapture agreement with PennyMac Financial Services, Inc. $ 1,757 $ 2,688 $ 5,244 Capitalization of servicing advances pursuant to mortgage loan modifications $ 1,340 $ 5,481 $ 18,923 Transfer of firm commitment to purchase CRT securities to CRT strips $ 56,804 $ — $ — Non-cash financing activities: Dividends declared, not paid $ 47,193 $ 28,816 $ 29,145

Regulatory Capital and Liquidit

Regulatory Capital and Liquidity Requirements	12 Months Ended
	Dec. 31, 2019
Mortgage Banking [Abstract]
Regulatory Capital and Liquidity Requirements	Note 32—Regulatory Capital and Liquidity Requirements PMC is a seller/servicer for Fannie Mae and Freddie Mac. The Company is required to comply with the following minimum capital and liquidity eligibility requirements to remain in good standing with each Agency: • A minimum net worth of $2.5 million plus 25 basis points of UPB for all loans serviced; • A tangible net worth/total assets ratio greater than or equal to 6%; and • Liquidity equal to or exceeding 3.5 basis points multiplied by the aggregate UPB of all mortgages secured by 1-4 unit residential properties serviced for Freddie Mac and Fannie Mae (“Agency Mortgage Servicing”) plus 200 basis points multiplied by the sum of nonperforming (90 or more days delinquent) Agency Mortgage Servicing that exceeds 6% of Agency Mortgage Servicing. The Agencies’ capital and liquidity amounts and requirements, the calculations of which are defined by each entity, 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) December 31, 2019 $ 627,144 $ 341,009 8 % 6 % $ 128,806 $ 44,970 December 31, 2018 $ 528,506 $ 238,915 11 % 6 % $ 58,144 $ 31,678 (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.

Parent Company Information

Parent Company Information	12 Months Ended
	Dec. 31, 2019
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]
Parent Company Information	Note 33—Parent Company Information The Company’s debt financing agreements require PMT and certain of its subsidiaries to comply with financial covenants that include a minimum tangible net worth as summarized below: December 31, 2019 Company consolidated Debt covenant requirement Calculated balance (1) (in thousands) PennyMac Mortgage Investment Trust $ 860,000 $ 2,450,915 Operating Partnership $ 860,000 $ 2,490,553 PennyMac Holdings $ 250,000 $ 730,914 PennyMac Corp $ 150,000 $ 627,004 (1) Calculated in accordance with the lenders’ requirements. The Company’s subsidiaries are limited from transferring funds to the Parent by these minimum tangible net worth requirements. PENNYMAC MORTGAGE INVESTMENT TRUST CONDENSED BALANCE SHEETS Following are condensed parent-only financial statements for the Company: December 31, 2019 2018 (in thousands) Assets Short-term investment $ 2,819 $ 714 Investments in subsidiaries 2,501,015 1,599,298 Due from subsidiaries 469 86 Other assets 595 647 Total assets $ 2,504,898 $ 1,600,745 Liabilities Dividends payable $ 47,193 $ 28,680 Accounts payable and accrued liabilities 1,564 2,338 Due to affiliates 399 888 Due to subsidiaries 1 27 Total liabilities 49,157 31,933 Shareholders' equity 2,455,741 1,568,812 Total liabilities and shareholders' equity $ 2,504,898 $ 1,600,745 PENNYMAC MORTGAGE INVESTMENT TRUST CONDENSED STATEMENTS OF INCOME Year ended December 31, 2019 2018 2017 (in thousands) Income Dividends from subsidiaries $ 165,451 $ 221,469 $ 177,571 Intercompany interest 34 8 7 Other 2,389 1,250 1,256 Total income 167,874 222,727 178,834 Expenses Intercompany interest 27 414 378 Other 3 — — Total expenses 30 414 378 Income before provision for income taxes and equity in undistributed earnings in subsidiaries 167,844 222,313 178,456 (Benefit from) provision for income taxes (109 ) 24 308 Income before equity in undistributed earnings of subsidiaries 167,953 222,289 178,148 Equity in undistributed earnings (distributions in excess of earnings) of subsidiaries 60,937 (71,180 ) (60,655 ) Net income $ 228,890 $ 151,109 $ 117,493 PENNYMAC MORTGAGE INVESTMENT TRUST CONDENSED STATEMENTS OF CASH FLOWS Year ended December 31, 2019 2018 2017 (in thousands) Cash flows from operating activities: Net income $ 228,890 $ 151,109 $ 117,493 (Distributions in excess of earnings, not yet distributed) Equity in undistributed earnings of subsidiaries (60,937 ) 71,180 60,655 Decrease in due from affiliates 261 490 620 Decrease (increase) in other assets 52 (58 ) 21 (Decrease) increase in accounts payable and accrued liabilities (697 ) (3,320 ) 2,892 Increase in due from affiliates (489 ) (185 ) (58 ) Increase in due to affiliates 33 84 35 Net cash provided by operating activities 167,113 219,300 181,658 Cash flows from investing activities: Increase in investment in subsidiaries (825,920 ) — (299,919 ) Net (increase) decrease in short-term investments (2,105 ) 1,159 (838 ) Net cash (used in) provided by investing activities (828,025 ) 1,159 (300,757 ) Cash flows from financing activities: Net (decrease) increase in intercompany unsecured note payable — (69,200 ) 50,791 Proceeds from issuance of common shares 839,682 — — Payment of issuance costs related to common shares (10,225 ) — — Payment of withholding taxes related to share-based compensation (2,600 ) — — Payment of dividends to preferred shareholders (24,944 ) (24,944 ) (14,066 ) Payment of dividends to common shareholders (141,001 ) (115,596 ) (126,135 ) Repurchases of common shares — (10,719 ) (91,198 ) Issuance of preferred shares — — 310,000 Payment of issuance costs related to preferred shares — — (10,293 ) Net cash provided by (used in) financing activities 660,912 (220,459 ) 119,099 Net change in cash — — — Cash at beginning of year — — — Cash at end of year $ — $ — $ — Non-cash investing activities: Investment in subsidiary pursuant to share based compensation plan $ 5,529 $ 5,314 $ 4,902 Non-cash financing activities: Investment in subsidiary pursuant to share based compensation plan $ 5,529 $ 5,314 $ 4,902 Dividends payable $ 47,193 $ 28,816 $ 31,655

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2019
Subsequent Events [Abstract]
Subsequent Events	Note 34—Subsequent Events Management has evaluated all events and transactions through the date the Company issued these consolidated financial statements. During this period: • During February 2020, the Company, through its indirect subsidiary, PMT CREDIT RISK TRANSFER TRUST 2020-1R, issued an aggregate principal amount of $350.0 million in secured term notes (the “2020-1R Notes”) to qualified institutional buyers under Rule 144A of the Securities Act. The 2020-1R Notes bear interest at a rate equal to one-month LIBOR plus 2.35% per annum, with an initial payment date of March 27, 2020 and, with respect to each calendar month thereafter, a payment date that shall occur on the second business day following the latest underlying payment date of all of the underlying series in that calendar month. The 2020-1R Notes mature in February 2023 February 2025 • All agreements to repurchase assets that matured before the date of this Report were extended or renewed.

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2019
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 and CRT strips (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. Almost all of the loans the Company has acquired in its correspondent production activities have been eligible for sale to government-sponsored entities (“GSEs”) such as the Federal National Mortgage Association (“Fannie Mae”) and the Federal Home Loan Mortgage Corporation (“Freddie Mac”) or through government agencies such as 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
Use of Estimates	Use of Estimates 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.
Consolidation	Consolidation The consolidated financial statements include the accounts of PMT and all wholly-owned subsidiaries. PMT has no significant equity method or cost-basis investments. Intercompany accounts and transactions are eliminated upon consolidation. The Company also consolidates the assets and liabilities included in certain Variable Interest Entities (“VIEs”) discussed below. Variable Interest Entities The Company enters into various types of on- and off-balance sheet transactions with special purpose entities (“SPEs”), which are trusts that are established for a limited purpose. Generally, SPEs are formed in connection with securitization transactions. In a securitization transaction, the Company transfers assets on its balance sheet to an SPE, which then issues various forms of beneficial interests in those assets to investors. In a securitization transaction, the Company typically receives a combination of cash and beneficial interests in the SPE in exchange for the assets transferred by the Company. SPEs are generally VIEs. A VIE is an entity having either a total equity investment at risk that is insufficient to finance its activities without additional subordinated financial support or whose equity investors at risk lack the ability to control the entity’s activities. Variable interests are investments or other interests that will absorb portions of a VIE’s expected losses or receive portions of the VIE’s expected residual returns. Expected residual returns represent the expected positive variability in the fair value of a VIE’s net assets. PMT consolidates the assets and liabilities of VIEs of which the Company is the primary beneficiary. The primary beneficiary is the party that has both the power to direct the activities that most significantly impact the VIE and holds a variable interest that could potentially be significant to the VIE. To determine whether a variable interest the Company holds could potentially be significant to the VIE, the Company considers both qualitative and quantitative factors regarding the nature, size and form of its involvement with the VIE. The Company assesses whether it is the primary beneficiary of a VIE on an ongoing basis. The Company evaluates the securitization trust into which assets are transferred to determine whether the entity is a VIE and whether the Company is the primary beneficiary and therefore is required to consolidate the securitization trust. Jumbo Loan Securitization Transaction On September 30, 2013, the Company completed a securitization transaction in which PMT Loan Trust 2013-J1, a VIE, issued $537.0 million in unpaid principal balance (“UPB”) of certificates backed by fixed-rate prime jumbo loans at a 3.9% weighted cost. The securities issued by the VIE are backed by the expected cash flows from its underlying fixed-rate prime jumbo loans. Cash inflows from these fixed-rate prime jumbo loans are distributed to investors and service providers in accordance with the contractual priority of payments and, as such, most of these inflows must be directed first to service and repay the senior certificates. After the senior certificates are repaid, substantially all cash inflows will be directed to the subordinated certificates until fully repaid and, thereafter, to the residual interest in the trust that the Company owns. The Company retains beneficial interests in the securitization transaction, including subordinated certificates and residual interests issued by the VIE. The Company retains credit risk in the securitization because the Company’s beneficial interests include the most subordinated interests in the securitized assets, which are the first beneficial interests to absorb credit losses on those assets. The Manager expects that any credit losses in the pools of securitized assets will likely be limited to the Company’s subordinated and residual interests. The Company has no obligation to repurchase or replace securitized assets that subsequently become delinquent or are otherwise in default other than pursuant to breaches of representations and warranties. The VIE is consolidated by PMT as the Company determined that it is the primary beneficiary of the VIE. The Company concluded that it is the primary beneficiary of the VIE as it has the power, through its affiliate, PLS, in its role as servicer of the loans, to direct the activities of the trust that most significantly impact the trust’s economic performance and the retained subordinated and residual interest trust certificates expose PMT to losses and returns that could potentially be significant to the VIE. For financial reporting purposes, the loans owned by the consolidated VIE are included in Loans at fair value Asset-backed financing of a variable interest entity Loans at fair value Asset-backed financing of a variable interest entity at fair value The Company recognizes the interest income earned on the loans owned by the VIE and the interest expense attributable to the asset-backed securities issued to nonaffiliates by the VIE on its consolidated income statements. Credit Risk Transfer The Company invests in CRT arrangements with Fannie Mae, pursuant to which PennyMac Corp. (“PMC”), through subsidiary trust entities, sells pools of loans into Fannie Mae-guaranteed loan securitizations while retaining Recourse Obligations in addition to IO ownership interests in such loans. The loans subject to the CRT arrangements were transferred by PMC to subsidiary trust entities which sold the loans into Fannie Mae loan securitizations. Transfers of loans subject to CRT arrangements receive sale accounting treatment. The Company has concluded that its subsidiary trust entities holding its CRT arrangements are VIEs and the Company is the primary beneficiary of the VIEs as it is the holder of the primary beneficial interests which absorb the variability of the trusts’ results of operations. Consolidation of the VIEs results in the inclusion on the Company’s consolidated balance sheet of the fair value of the Recourse Obligations, and retained IO ownership interests in the form of derivative and interest-only strip assets, the deposits pledged to fulfill the Recourse Obligations and an interest only security payable at fair value. The deposits represent the Company’s maximum contractual exposure to claims under its Recourse Obligations and is the sole source of settlement of losses under the CRT arrangements. Gains and losses on the derivative and interest-only strip assets related to CRT arrangements are included in Net gain on investments in the consolidated statements of income.
Fair Value	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.
Short-Term Investments	Short-Term Investments Short-term investments are carried at fair value with changes in fair value recognized in current period income. Short-term investments represent deposit accounts. The Company categorizes its short-term investments as “Level 1” fair value assets.
Mortgage-Backed Securities	Mortgage-Backed Securities Purchases and sales of MBS are recorded as of the trade date. The Company’s investments in MBS are carried at fair value with changes in fair value recognized in current period income. Changes in fair value arising from amortization of purchase premiums and accrual of unearned discounts are recognized using the interest method and are included in Interest income. Net gain on investments. Interest Income Recognition Interest income on MBS is recognized over the life of the security using the interest method. The Company estimates, at the time of purchase, the future expected cash flows and determines the effective interest rate based on the estimated cash flows and the security’s purchase price. The Company updates its cash flow estimates monthly.
Loans	Loans Loans are carried at their fair values. Changes in the fair value of loans are recognized in current period income. Changes in fair value, other than changes in fair value attributable to accrual of unearned discounts and amortization of purchase premiums, are included in Net gain on investments Loans at fair Net gain on loans acquired for sale Loans acquired for sale at fair value Interest income Loans acquired for sale at fair value Loans at fair value held in VIE Sale Recognition The Company purchases from and sells loans into the secondary mortgage market without recourse for credit losses. However, the Company maintains continuing involvement with the loans in the form of servicing arrangements and the liability under the representations and warranties it makes to purchasers and insurers of the loans. The Company recognizes transfers of loans as sales based on whether the transfer is made to a VIE: • For loans that are not transferred to a VIE, the Company recognizes the transfer as a sale when it surrenders control over the loans. Control over transferred loans is deemed to be surrendered when (i) the loans have been isolated from the Company, (ii) the transferee has the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred loans, and (iii) the Company does not maintain effective control over the transferred loans through either (a) an agreement that entitles and obligates the Company to repurchase or redeem them before their maturity or (b) the ability to unilaterally cause the holder to return specific loans. • For loans that are transferred to a VIE, the Company recognizes the transfer as a sale when it determines that the Company is not the primary beneficiary of the VIE. Interest Income Recognition The Company has the ability but not the intent to hold loans acquired for sale and loans at fair value other than loans held in a VIE for the foreseeable future. Therefore, interest income on loans acquired for sale and loans at fair value other than loans held in a VIE is recognized over the life of the loans using their contractual interest rates. The Company has both the ability and intent to hold loans held in a VIE for the foreseeable future. Therefore, interest income on loans held in a variable interest entity is recognized over the estimated remaining life of the loans using the interest method. Unearned discounts and purchase premiums are accrued and amortized to interest income using the effective interest rate inherent in the estimated cash flows from the loans. Income recognition is suspended and the accrued unpaid interest receivable is reversed against interest income when loans become 90 days delinquent, or when, in the Company’s opinion, a full recovery of income and principal becomes doubtful. Income recognition is resumed when the loan becomes contractually current.
Excess Servicing Spread	Excess Servicing Spread The Company has acquired the right to receive the ESS related to certain of the MSRs owned by PFSI. ESS is carried at its fair value. The Company categorizes ESS as a “Level 3” fair value asset. Interest Income Recognition Interest income for ESS is accrued using the interest method, based upon the expected yield from the ESS through the expected life of the underlying mortgages. Changes to the expected interest yield result in a change in fair value which is recorded in Interest income
Derivative and Credit Risk Transfer Strip Assets	Derivative and Credit Risk Transfer Strip Assets 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: • Interest rate lock commitments (“IRLCs”) that are created when the Company commits to purchase loans acquired for sale; • CRT Agreements whereby the Company retains a Recourse Obligation relating to certain loans it sells 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 the 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 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 income. The Company does not designate and qualify any of its derivative financial instruments for hedge accounting.
Firm Commitment to Purchase Credit Risk Transfer Securities	Firm Commitment to Purchase Credit Risk Transfer Securities The Company carries its firm commitment to purchase CRT securities at fair value. The firm commitment to purchase CRT securities is recognized initially as a component of Net gain on loans acquired for sale Net gain on investments
Real Estate Acquired in Settlement of Loans	Real Estate Acquired in Settlement of Loans REO is measured at the lower of the acquisition cost of the property (as measured by purchase price in the case of purchased REO; or the fair value of the loan immediately before REO acquisition in the case of acquisition in settlement of a loan) or its fair value reduced by estimated costs to sell. Changes in fair value to levels that are less than or equal to acquisition cost and gains or losses on sale of REO are recognized in the consolidated statements of income under the caption Results of real estate acquired in settlement of loans
Mortgage Servicing Rights	Mortgage Servicing Rights MSRs arise from contractual agreements between the Company and investors (or their agents) in mortgage securities and loans. Under these agreements, the Company is obligated to provide loan servicing functions in exchange for fees and other remuneration. The servicing functions typically performed include, among other responsibilities, collecting and remitting loan payments; responding to borrower inquiries; accounting for principal and interest, holding custodial (impound) funds for payment of property taxes and insurance premiums; counseling delinquent borrowers; and supervising the acquisition and disposition of REO. The Company has engaged PFSI to provide these services on its behalf. The Company recognizes MSRs initially at their fair values, either as proceeds from sales of loans where the Company assumes the obligation to service the loan in the sale transaction, or from the purchase of MSRs. The Company categorizes its MSR as a “Level 3” fair value asset. Through December 31, 2017, the Company accounted for MSRs at either the asset’s fair value with changes in fair value recorded in current period earnings or using the amortization method with the MSRs carried at the lower of amortized cost or fair value based on the class of MSR. The Company identified two classes of MSRs: originated MSRs backed by loans with initial interest rates of less than or equal to 4.5%; and originated MSRs backed by loans with initial interest rates of more than 4.5%. Originated MSRs backed by loans with initial interest rates of less than or equal to 4.5% were accounted for using the amortization method. Originated MSRs backed by loans with initial interest rates of more than 4.5% were accounted for at fair value with changes in fair value recorded in current period income. MSRs Accounted for at Fair Value Effective January 1, 2018, the Company accounts for all current classes of MSRs at fair value. Changes in fair value of MSRs accounted for at fair value are recognized in current period income as a component of Net loan servicing fees-from nonaffiliates-amortization, impairment, and changes fair value of mortgage servicing rights MSRs Accounted for Using the MSR Amortization Method The Company amortized MSRs that were accounted for using the MSR amortization method. MSR amortization was determined by applying the ratio of the net MSR cash flows projected for the current period to the projected total remaining net MSR cash flows. The estimated total net MSR cash flows were estimated at the beginning of each month using prepayment inputs applicable at that time. The Company assessed MSRs accounted for using the amortization method for impairment monthly. Impairment occurred when the current fair value of the MSR decreased below the asset’s amortized cost. If MSRs were impaired, the impairment was recognized in current-period income and the carrying value (carrying value is amortized cost reduced by a valuation allowance) of the MSRs was adjusted through a valuation allowance. If the fair value of impaired MSRs subsequently increased, the Company recognized the increase in fair value in current-period earnings and adjusted the carrying value of the MSRs through a reduction in the valuation allowance to adjust the carrying value only to the extent of the valuation allowance. The Company stratified its MSRs by risk characteristic when evaluating for impairment. For purposes of performing its MSR impairment evaluation, the Company stratified its servicing portfolio on the basis of certain risk characteristics including loan type (fixed-rate or adjustable-rate) and note interest rate. Fixed-rate loans were stratified into note interest rate pools of 50 basis points for note interest rates between 3.0% and 4.5% and a single pool for note interest rates below 3%. Adjustable rate loans with initial interest rates of 4.5% or less were evaluated in a single pool. If the fair value of MSRs in any of the note interest rate pools was below the amortized cost of the MSRs for that pool, impairment was recognized to the extent of the difference between the fair value and the existing carrying value for that pool. The Company periodically reviewed the various impairment strata to determine whether the fair value of the impaired MSRs in a given stratum was likely to recover in the foreseeable future. When the Company deemed recovery of the fair value to be unlikely in the foreseeable future, a write-down of the cost of the MSRs for that stratum to its estimated recoverable value was charged to the valuation allowance. Amortization and impairment of MSRs were included in current period income as a component of Net loan servicing fees - from nonaffiliates - Amortization, impairment and change in fair value of mortgage servicing rights.
Servicing Advances	Servicing Advances Servicing advances represent advances made on behalf of borrowers and the loans’ investors to fund delinquent balances for property tax and insurance premiums and out of pocket costs (e.g., preservation and restoration of mortgaged property, legal fees, appraisals and insurance premiums). Servicing advances are made in accordance with the Company’s servicing agreements and, when made, are deemed recoverable. The Company periodically reviews servicing advances for collectability. Servicing advances are written off when they are deemed uncollectible.
Borrowings	Borrowings Borrowings, other than Asset-backed financing of a VIE at fair value Interest-only security payable at fair value Interest expense Exchangeable senior notes Notes payable secured by credit risk transfer and mortgage servicing assets Asset-backed financing of a VIE at Fair Value The certificates issued to nonaffiliates by the Company relating to the asset-backed financing are recorded as borrowings. Certificates issued to nonaffiliates have the right to receive principal and interest payments of the loans held by the consolidated VIE. Asset-backed financings of the VIE are carried at fair value. Changes in fair value are recognized in current period income as a component of Net gain on investments
Liability for Losses Under Representation and Warranties	Liability for Losses Under Representations and Warranties The Company provides for its estimate of the losses that it expects to incur in the future as a result of its breach of the representations and warranties that it provides to the purchasers and insurers of the loans it has sold. The Company’s agreements with the Agencies and other investors include representations and warranties related to the loans the Company sells to the Agencies and other investors. The representations and warranties require adherence to Agency and other investor origination and underwriting guidelines, including but not limited to the validity of the lien securing the loan, property eligibility, property value, loan amount, borrower credit, income and asset requirements, and compliance with applicable federal, state and local law. In the event of a breach of its representations and warranties, the Company may be required to either repurchase the loans with the identified defects or indemnify the investor or insurer. In such cases, the Company bears any subsequent credit loss on the loans. The Company’s credit loss may be reduced by any recourse it has to correspondent sellers that, in turn, had sold such loans to the Company and breached similar or other representations and warranties. In such event, the Company has the right to seek a recovery of related repurchase losses from that correspondent seller. The Company records a provision for losses relating to representations and warranties as part of its loan sale transactions. The method used to estimate the liability for representations and warranties is a function of the representations and warranties given and considers a combination of factors, including, but not limited to, estimated future defaults and loan defect rates, the estimated severity of loss in the event of default and the probability of reimbursement by the correspondent loan seller. The Company establishes a liability at the time loans are sold and periodically updates its liability estimate. The level of the liability for representations and warranties is reviewed and approved by the Company’s management credit committee. The level of the liability for representations and warranties is difficult to estimate and requires considerable judgment. The level of loan repurchase losses is dependent on economic factors, investor demand strategies, and other external conditions that may change over the lives of the underlying loans. The Company’s representations and warranties are generally not subject to stated limits of exposure. However, the Company believes that the current unpaid principal balance of loans sold by PMT to date represents the maximum exposure to repurchases related to representations and warranties.
Loan Servicing Fees	Loan Servicing Fees Loan servicing fees and other remuneration are received by the Company for servicing residential loans. Loan servicing activities are described under Mortgage servicing rights Loan servicing fee amounts are based upon fee schedules established by the applicable investor and upon the unpaid principal balance of the loans. The Company’s obligation under its loan servicing agreements is fulfilled as the Company services the loans. Loan servicing fees are recorded net of Agency guarantee fees paid by the Company. Loan servicing fees are recorded when the loan payments are collected from the borrowers.
Share-Based Compensation	Share-Based Compensation The Company amortizes the fair value of previously granted share-based awards to Compensation Compensation The initial cost of share-based awards is established at the Company’s closing share price adjusted for the portion of the awards expected to vest on the date of the award. The Company adjusts the cost of its share-based awards for changes in estimates of the portion of the awards it expects to be forfeited by grantees and for changes in expected performance attainment in each subsequent reporting period until the units have vested or have been forfeited, the service being provided is subsequently completed, or, under certain circumstances, is likely to be completed, whichever occurs first.
Income Taxes	Income Taxes The Company has elected to be taxed as a REIT and the Company believes PMT complies with the provisions of the Internal Revenue Code applicable to REITs. Accordingly, the Company believes PMT will not be subject to federal income tax on that portion of its REIT taxable income that is distributed to shareholders as long as certain asset, income and share ownership tests are met. If PMT fails to qualify as a REIT, and does not qualify for certain statutory relief provisions, it will be subject to income taxes and may be precluded from qualifying as a REIT for the four tax years following the year of loss of the Company’s REIT qualification. The Company’s taxable REIT subsidiary (“TRS”) is subject to federal and state income taxes. Income taxes are provided for using the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted rates expected to apply to taxable income in the years in which the Company expects those temporary differences to be recovered or settled. The effect on deferred taxes of a change in tax rates is recognized in income in the period in which the change occurs. A valuation allowance is established if, in the Company’s judgment, realization of deferred tax assets is not more likely than not. The Company recognizes a tax benefit relating to tax positions it takes only if it is more likely than not that the position will be sustained upon examination by the appropriate taxing authority. A tax position that meets this standard is recognized as the largest amount that exceeds 50 percent likelihood of being realized upon settlement. The Company will classify any penalties and interest as a component of income tax expense.
Recently Issued Accounting Pronouncement	Recently Issued Accounting Pronouncement In June 2016, the FASB issued Accounting Standard Update No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments ASU 2016-13 is effective January 1, 2020 for the Company. Adoption of ASU 2016-13 will be applied using a modified retrospective approach through a cumulative-effect adjustment to retained earnings as of the effective date. Because of the Company’s current accounting, adoption of ASU 2016-13 on January 1, 2020 is not expected to have a significant effect on the Company’s allowance for credit losses on its assets subject to ASU 2016-13 due to the assets’ relatively short-term lives.

Organization and Basis of Prese

Organization and Basis of Presentation (Policies)	12 Months Ended
	Dec. 31, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
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 Company’s Exchangeable Notes, by the weighted average common shares outstanding, assuming all dilutive securities were issued.

Transactions with Related Par_2

Transactions with Related Parties (Tables)	12 Months Ended
	Dec. 31, 2019
Related Party Transactions [Abstract]
Summary of Correspondent Production Activity	Following is a summary of correspondent production activity between the Company and PLS: Year ended December 31, 2019 2018 2017 (in thousands) Loan fulfillment fees earned by PLS $ 160,610 $ 81,350 $ 80,359 UPB of loans fulfilled by PLS $ 56,033,704 $ 26,194,303 $ 22,971,119 Sourcing fees received from PLS included in Net gain on loans acquired for sale $ 14,381 $ 10,925 $ 12,084 UPB of loans sold to PLS $ 47,937,306 $ 36,415,933 $ 40,561,241 Purchases of loans acquired for sale from PLS $ 6,255,915 $ 3,343,028 $ 904,097 Tax service fees paid to PLS $ 14,697 $ 7,433 $ 7,078 December 31, 2019 December 31, 2018 (in thousands) Loans included in Loans acquired for sale at fair value pending sale to PLS $ 490,383 $ 86,308
Summary of Loan Servicing Fees Earned and Mortgage Servicing Rights Recaptured Income Earned	Following is a summary of loan servicing fees earned by PLS and MSR recapture income earned from PLS: Year ended December 31, 2019 2018 2017 (in thousands) Loan servicing fees: Loans acquired for sale at fair value $ 1,772 $ 1,037 $ 954 Loans at fair value 2,207 7,555 15,610 MSRs 44,818 33,453 26,500 $ 48,797 $ 42,045 $ 43,064 Average investment in: Loans acquired for sale at fair value $ 2,754,955 $ 1,577,395 $ 1,366,017 Loans at fair value: Distressed $ 75,251 $ 473,458 $ 1,152,930 Held in a VIE $ 281,449 $ 301,398 $ 344,942 Average MSR portfolio UPB $ 110,075,179 $ 80,500,212 $ 63,836,843 MSR recapture income recognized included in Net loan servicing fees from PennyMac Financial Services, Inc. $ 5,324 $ 2,192 $ 1,428
Summary of Management Fee Expense	Following is a summary of management fee expenses: Year ended December 31, 2019 2018 2017 (in thousands) Base management $ 29,303 $ 23,033 $ 22,280 Performance incentive 7,189 1,432 304 $ 36,492 $ 24,465 $ 22,584 Average shareholders' equity amounts used to calculate management fee expense $ 1,958,970 $ 1,535,590 $ 1,484,446
Summary of Expenses	Following is a summary of the Company’s reimbursements to PCM and its affiliates for expenses: Year ended December 31, 2019 2018 2017 (in thousands) Reimbursement of: Common overhead incurred by PCM and its affiliates $ 5,340 $ 4,640 $ 5,306 Compensation 480 480 — Expenses incurred on the Company’s behalf, net 4,362 1,113 2,257 $ 10,182 $ 6,233 $ 7,563 Payments and settlements during the year (1) $ 177,116 $ 71,943 $ 64,945 (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: Year ended December 31, 2019 2018 2017 (in thousands) ESS: Received pursuant to a recapture agreement $ 1,757 $ 2,688 $ 5,244 Repayments and sales $ 40,316 $ 46,750 $ 54,980 Interest income $ 10,291 $ 15,138 $ 16,951 Net (loss) gain included in Net gain (loss) on investments: Valuation changes $ (9,256 ) $ 8,500 $ (19,350 ) Recapture income 1,726 2,584 4,820 $ (7,530 ) $ 11,084 $ (14,530 ) December 31, 2019 2018 (in thousands) Excess servicing spread purchased from PennyMac Financial Services, Inc. at fair value $ 178,586 $ 216,110
Summary Of Financing Transactions	Following is a summary of financing activities between the Company and PFSI: Year ended December 31, 2019 2018 2017 (in thousands) Net repayments of assets sold under agreements to repurchase $ 23,513 $ 13,103 $ 5,872 Interest expense $ 6,302 $ 7,462 $ 8,038 Payment of conditional reimbursement to PCM $ 580 $ 69 $ 30 December 31, 2019 December 31, 2018 (in thousands) Assets sold to PFSI under agreement to repurchase $ 107,512 $ 131,025 Conditional Reimbursement payable to PCM included in Due to PennyMac Financial Services, Inc. $ 221 $ 801
Summary of Amounts Receivable From and Payable to PFSI	Amounts receivable from and payable to PFSI are summarized below: December 31, 2019 December 31, 2018 (in thousands) Due from PFSI: MSR recapture $ 149 $ 179 Other 2,611 3,898 $ 2,760 $ 4,077 Due to PFSI: Fulfillment fees $ 18,285 $ 10,006 Correspondent production fees 10,606 2,071 Management fees 10,579 6,559 Loan servicing fees 4,659 4,841 Allocated expenses and expenses paid by PFSI on PMT’s behalf 3,724 9,066 Conditional Reimbursement 221 801 Interest on Assets sold to PFSI under agreement to repurchase 85 120 $ 48,159 $ 33,464
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 on the respective balance sheet items as summarized below: Balance sheet line including advance amount December 31, 2019 December 31, 2018 (in thousands) Loan servicing advances $ 48,971 $ 67,666 Real estate acquired in settlement of loans 21,549 32,888 $ 70,520 $ 100,554

Loan Sales (Tables)

Loan Sales (Tables)	12 Months Ended
	Dec. 31, 2019
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: Year ended December 31, 2019 2018 2017 (in thousands) Cash flows: Proceeds from sales $ 61,128,081 $ 29,369,656 $ 24,314,165 Loan servicing fees received net of guarantee fees $ 295,390 $ 204,663 $ 164,776
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: December 31, 2019 December 31, 2018 (in thousands) UPB of loans outstanding $ 130,663,117 $ 91,982,335 Collection Status (UPB) Delinquency: 30-89 days delinquent $ 1,014,094 $ 614,668 90 or more days delinquent: Not in foreclosure $ 258,036 $ 142,871 In foreclosure $ 53,697 $ 40,445 Bankruptcy $ 130,936 $ 75,947 Custodial funds managed by the Company (1) $ 2,529,984 $ 970,328 (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 Interest income

Variable Interest Entities (Tab

Variable Interest Entities (Tables) - Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]	12 Months Ended
	Dec. 31, 2019
Jumbo Mortgage Loan Financing [Member]
Summary of Jumbo Mortgage Loan Financing	Following is a summary of the Company’s jumbo loan financing: Year ended December 31, 2019 2018 2017 (in thousands) Interest income $ 11,734 $ 11,813 $ 14,425 Interest expense $ 11,324 $ 10,821 $ 13,184 December 31, 2019 December 31, 2018 (in thousands) Loans at fair value $ 256,367 $ 290,573 Asset-backed financing at fair value $ 243,360 $ 276,499 Certificates retained at fair value $ 13,007 $ 14,074
Credit Risk Transfer Agreements [Member]
Summary of Credit Risk Transfer Agreements	Following is a summary of the CRT arrangements: Year ended December 31, 2019 2018 2017 (in thousands) UPB of loans sold $ 47,748,300 $ 21,939,277 $ 14,529,548 Investments: Deposits securing CRT arrangements $ 933,370 $ 596,626 $ 152,641 Change in expected face amount of firm commitment to purchase CRT securities and commitments to fund Deposits securing CRT arrangements resulting from sales of loans 897,151 122,581 390,362 $ 1,830,521 $ 719,207 $ 543,003 Investment income: Net gain on investments: Derivative and CRT strip assets: CRT strips Realized $ 32,200 Valuation changes (1,874 ) 30,326 CRT derivatives Realized 79,619 $ 86,928 $ 51,731 Valuation changes (9,571 ) 25,347 83,030 70,048 112,275 134,761 Interest-only security payable at fair value 10,302 (19,332 ) (11,033 ) 110,676 92,943 123,728 Firm commitments to purchase CRT securities 60,943 7,399 — 171,619 100,342 123,728 Net gain on loans acquired for sale - Fair value of firm commitment to purchase CRT securities recognized upon sale of loans 99,305 30,595 — Interest income - Deposits securing CRT arrangements 34,229 15,441 4,291 $ 305,153 $ 146,378 $ 128,019 Payments made to settle losses on credit risk transfer arrangements $ 5,165 $ 2,133 $ 1,396 December 31, 2019 December 31, 2018 (in thousands) Carrying value of CRT arrangements: Derivative and credit risk transfer strip assets CRT strips $ 54,930 $ — CRT derivatives 115,863 123,987 $ 170,793 $ 123,987 Firm commitment to purchase credit risk transfer securities at fair value $ 109,513 $ 37,994 Deposits securing credit risk transfer arrangements $ 1,969,784 $ 1,146,501 Interest-only security payable at fair value $ 25,709 $ 36,011 CRT arrangement assets pledged to secure borrowings: Derivative and credit risk transfer strip assets $ 142,183 $ 87,976 Deposits securing CRT arrangements $ 1,969,784 $ 1,146,501 Face amount of firm commitment to purchase CRT securities $ 1,502,203 $ 605,052 UPB of loans - funded credit risk transfer arrangements $ 41,944,117 $ 29,934,003 Collection status (UPB): Delinquency Current $ 41,355,622 $ 29,633,133 30—89 days delinquent $ 463,331 $ 228,296 90—180 days delinquent $ 106,234 $ 39,826 180 or more days delinquent $ 8,802 $ 4,208 Foreclosure $ 10,128 $ 5,180 Bankruptcy $ 55,452 $ 23,360 UPB of loans - firm commitment to purchase CRT securities $ 38,738,396 $ 16,392,300 Collection status (UPB): Delinquency Current $ 38,581,080 $ 16,329,044 30—89 days delinquent $ 146,256 $ 61,035 90—180 days delinquent $ 9,109 $ 2,221 180 or more days delinquent $ — $ — Foreclosure $ 1,951 $ — Bankruptcy $ 2,980 $ 1,258

Fair Value (Tables)

Fair Value (Tables)	12 Months Ended
	Dec. 31, 2019
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: December 31, 2019 Level 1 Level 2 Level 3 Total (in thousands) Assets: Short-term investments $ 90,836 $ — $ — $ 90,836 Mortgage-backed securities at fair value — 2,839,633 — 2,839,633 Loans acquired for sale at fair value — 4,129,858 18,567 4,148,425 Loans at fair value — 256,367 14,426 270,793 Excess servicing spread purchased from PFSI — — 178,586 178,586 Derivative and credit risk transfer strip assets: Credit risk transfer strips — — 54,930 54,930 CRT derivatives — — 115,863 115,863 Interest rate lock commitments — — 11,726 11,726 Repurchase agreement derivatives — — 5,275 5,275 Forward purchase contracts — 7,525 — 7,525 Forward sale contracts — 637 — 637 MBS put options — 1,625 — 1,625 Swap futures — 4,347 — 4,347 Swaptions — — — — Call options on interest rate futures 3,809 — — 3,809 Put options on interest rate futures 2,859 — — 2,859 Total derivative and credit risk transfer strip assets before netting 6,668 14,134 187,794 208,596 Netting — — — (6,278 ) Total derivative and credit risk transfer strip assets after netting 6,668 14,134 187,794 202,318 Firm commitment to purchase credit risk transfer securities at fair value — — 109,513 109,513 Mortgage servicing rights at fair value — — 1,535,705 1,535,705 $ 97,504 $ 7,239,992 $ 2,044,591 $ 9,375,809 Liabilities: Asset-backed financing of a VIE at fair value $ — $ 243,360 $ — $ 243,360 Interest-only security payable at fair value — — 25,709 25,709 Derivative liabilities: Interest rate lock commitments — — 572 572 Forward purchase contracts — 3,600 — 3,600 Forward sales contracts — 15,644 — 15,644 Total derivative liabilities before netting — 19,244 572 19,816 Netting — — — (13,393 ) Total derivative liabilities after netting — 19,244 572 6,423 $ — $ 262,604 $ 26,281 $ 275,492 December 31, 2018 Level 1 Level 2 Level 3 Total (in thousands) Assets: Short-term investments $ 74,850 $ — $ — $ 74,850 Mortgage-backed securities at fair value — 2,610,422 — 2,610,422 Loans acquired for sale at fair value — 1,626,483 17,474 1,643,957 Loans at fair value — 290,573 117,732 408,305 Excess servicing spread purchased from PFSI — — 216,110 216,110 Derivative assets: CRT derivatives — — 123,987 123,987 Interest rate lock commitments — — 12,162 12,162 Repurchase agreement derivatives — — 14,511 14,511 Forward purchase contracts — 14,845 — 14,845 Forward sale contracts — 13 — 13 MBS put options — 218 — 218 MBS call options — 945 — 945 Call options on interest rate futures 5,137 — — 5,137 Put options on interest rate futures 178 — — 178 Total derivative assets before netting 5,315 16,021 150,660 171,996 Netting — — — (4,831 ) Total derivative assets after netting 5,315 16,021 150,660 167,165 Firm commitment to purchase credit risk transfer securities at fair value — — 37,994 37,994 Mortgage servicing rights at fair value — — 1,162,369 1,162,369 $ 80,165 $ 4,543,499 $ 1,702,339 $ 6,321,172 Liabilities: Asset-backed financing of a VIE at fair value $ — $ 276,499 $ — $ 276,499 Interest-only security payable at fair value — — 36,011 36,011 Derivative liabilities: Interest rate lock commitments — — 174 174 Forward purchase contracts — 43 — 43 Forward sales contracts — 29,273 — 29,273 Total derivative liabilities before netting — 29,316 174 29,490 Netting — — — (23,576 ) Total derivative liabilities after netting — 29,316 174 5,914 $ — $ 305,815 $ 36,185 $ 318,424
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 years presented: Year ended December 31, 2019 Assets Loans acquired for sale Loans at fair value Excess servicing spread CRT strips CRT derivatives Interest rate lock commitments (1) Repurchase agreement derivatives Firm commitment to purchase CRT securities Mortgage servicing rights Total (in thousands) Balance, December 31, 2018 $ 17,474 $ 117,732 $ 216,110 $ — $ 123,987 $ 11,988 $ 14,511 $ 37,994 $ 1,162,369 $ 1,702,165 Purchases and issuances 26,823 1,077 — — — 65,051 10,057 — — 103,008 Repayments and sales (27,609 ) (88,460 ) (40,316 ) (32,200 ) (78,172 ) — (19,317 ) (31,925 ) (17 ) (318,016 ) Capitalization of interest and fees — 2,318 10,291 — — — — — — 12,609 Capitalization of advances — 1,340 — — — — — — — 1,340 ESS received pursuant to a recapture agreement with PFSI — — 1,757 — — — — — — 1,757 Amounts received as proceeds from sales of loans — — — — — — — 99,305 837,706 937,011 Changes in fair value included in income arising from: Changes in instrument- specific credit risk — 3,737 — — — — — — — 3,737 Other factors 1,070 (10,906 ) (9,256 ) 30,326 70,048 80,133 24 60,943 (464,353 ) (241,971 ) 1,070 (7,169 ) (9,256 ) 30,326 70,048 80,133 24 60,943 (464,353 ) (238,234 ) Transfers: Loans to REO — (12,412 ) — — — — — — — (12,412 ) Loans acquired for sale at fair value from "Level 2" to "Level 3" (2) 809 — — — — — — — — 809 Firm commitment to purchase CRT securities to CRT strips — — — 56,804 — — — (56,804 ) — — Interest rate lock commitments to loans acquired for sale (3) — — — — — (146,018 ) — — — (146,018 ) Balance, December 31, 2019 $ 18,567 $ 14,426 $ 178,586 $ 54,930 $ 115,863 $ 11,154 $ 5,275 $ 109,513 $ 1,535,705 $ 2,044,019 Changes in fair value recognized during the year relating to assets still held at December 31, 2019 $ 121 $ (8,255 ) $ (9,256 ) $ (1,874 ) $ (9,571 ) $ 11,154 $ 107 $ 29,808 $ (464,353 ) $ (452,119 ) (1) For the purpose of this table, IRLC asset and liability positions are shown net. (2) The Company identified certain “Level 2” fair value loans acquired for sale that were not saleable into the prime mortgage market and therefore transferred them to “Level 3”. (3) 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 Year ended December 31, 2019 (in thousands) Interest-only security payable: Balance, December 31, 2018 $ 36,011 Changes in fair value included in income arising from: Changes in instrument-specific credit risk — Other factors (10,302 ) (10,302 ) Balance, December 31, 2019 $ 25,709 Changes in fair value recognized during the year relating to liability outstanding at December 31, 2019 $ (10,302 ) Year ended December 31, 2018 Assets Loans acquired for sale Loans at fair value Excess servicing spread Interest rate lock commitments (1) CRT derivatives Repurchase agreement derivatives Firm commitment to purchase CRT securities Mortgage servicing rights Total (in thousands) Balance, December 31, 2017 $ 8,135 $ 768,433 $ 236,534 $ 4,632 $ 98,640 $ 3,748 $ — $ 91,459 $ 1,211,581 Cumulative effect of a change in accounting principle — Adoption of fair value accounting for mortgage servicing rights — — — — — — — 773,035 773,035 Balance, January 1, 2018 8,135 768,433 236,534 4,632 98,640 3,748 — 864,494 1,984,616 Purchases and issuances 12,208 — — 4,655 — 19,918 — — 36,781 Repayments and sales (12,934 ) (600,638 ) (46,750 ) — (86,928 ) (8,964 ) — (100 ) (756,314 ) Capitalization of interest — 7,439 15,138 — — — — — 22,577 Capitalization of advances — 5,481 — — — — — — 5,481 ESS received pursuant to a recapture agreement with PFSI — — 2,688 — — — — — 2,688 Amounts received as proceeds from sales of loan — — — — — — 30,595 356,755 387,350 Changes in fair value included in income arising from: Changes in instrument- specific credit risk — 2,907 — — — — — — 2,907 Other factors (16 ) (18,104 ) 8,500 (14,016 ) 112,275 (191 ) 7,399 (58,780 ) 37,067 (16 ) (15,197 ) 8,500 (14,016 ) 112,275 (191 ) 7,399 (58,780 ) 39,974 Transfers: Loans to REO — (47,786 ) — — — — — — (47,786 ) Loans acquired for sale at fair value from "Level 2" to "Level 3" (2) 10,081 — — — — — — — 10,081 Interest rate lock commitments to loans acquired for sale (3) — — — 16,717 — — — — 16,717 Balance, December 31, 2018 $ 17,474 $ 117,732 $ 216,110 $ 11,988 $ 123,987 $ 14,511 $ 37,994 $ 1,162,369 $ 1,702,165 Changes in fair value recognized during the year relating to assets still held at December 31, 2018 $ (158 ) $ (18,428 ) $ 8,500 $ 11,988 $ 25,347 $ 77 $ 37,994 $ (58,780 ) $ 6,540 (1) For the purpose of this table, IRLC asset and liability positions are shown net. (2) The Company identified certain “Level 2” fair value loans acquired for sale that were not saleable into the prime mortgage market and therefore transferred them to “Level 3”. (3) 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 Year ended December 31, 2018 (in thousands) Interest-only security payable: Balance, December 31, 2017 $ 7,070 Changes in fair value included in income arising from: Changes in instrument-specific credit risk — Other factors 28,941 28,941 Balance, December 31, 2018 $ 36,011 Changes in fair value recognized during the year relating to liability outstanding at December 31, 2018 $ 28,941 Year ended December 31, 2017 Assets Loans acquired for sale Loans at fair value Excess servicing spread Interest rate lock commitments (1) CRT derivatives Repurchase agreement derivatives Mortgage servicing rights Total (in thousands) Balance, January 31, 2016 $ 5,682 $ 1,354,572 $ 288,669 $ 3,777 $ 15,610 $ — $ 64,136 $ 1,732,446 Purchases and issuances 11,415 — — 36,005 — 3,864 79 51,363 Repayments and sales (12,513 ) (530,367 ) (54,980 ) — (51,731 ) — — (649,591 ) Capitalization of interest — 30,795 16,951 — — — — 47,746 Capitalization of advances — 18,923 — — — — — 18,923 ESS received pursuant to a recapture agreement with PFSI — — 5,244 — — — — 5,244 Amounts received as proceeds from sales of loans — — — — — — 41,379 41,379 Changes in fair value included in income arising from: Changes in instrument- specific credit risk — 24,685 — — — — — 24,685 Other factors 1,045 (25,369 ) (19,350 ) 45,304 134,761 (116 ) (14,135 ) 122,140 1,045 (684 ) (19,350 ) 45,304 134,761 (116 ) (14,135 ) 146,825 Transfers: Loans to REO — (104,806 ) — — — — — (104,806 ) Loans acquired for sale at fair value from "Level 2" to "Level 3" (2) 2,506 — — — — — — 2,506 Interest rate lock commitments to loans acquired for sale (3) — — — (80,454 ) — — — (80,454 ) Balance, December 31, 2017 $ 8,135 $ 768,433 $ 236,534 $ 4,632 $ 98,640 $ 3,748 $ 91,459 $ 1,211,581 Changes in fair value recognized during the year relating to assets still held at December 31, 2017 $ 98 $ (10,594 ) $ (19,350 ) $ 4,632 $ 83,030 $ (116 ) $ (14,135 ) $ 43,565 (1) For the purpose of this table, IRLC asset and liability positions are shown net. (2) The Company identified certain “Level 2” fair value loans acquired for sale that were not saleable into the prime mortgage market and therefore transferred them to “Level 3”. (3) 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 Year ended December 31, 2017 (in thousands) Interest-only security payable: Balance, December 31, 2016 $ 4,114 Changes in fair value included in income arising from: Changes in instrument- specific credit risk — Other factors 2,956 2,956 Balance, December 31, 2017 $ 7,070 Changes in fair value recognized during the year relating to liability outstanding at December 31, 2017 $ 2,956
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: December 31, 2019 December 31, 2018 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: $ 4,147,374 $ 4,010,444 $ 136,930 $ 1,643,465 $ 1,580,504 $ 62,961 90 or more days delinquent: Not in foreclosure 572 615 (43 ) 492 492 — In foreclosure 479 566 (87 ) — — — 1,051 1,181 (130 ) 492 492 — $ 4,148,425 $ 4,011,625 $ 136,800 $ 1,643,957 $ 1,580,996 $ 62,961 Loans at fair value: Loans held in a consolidated VIE: Current through 89 days delinquent $ 255,706 $ 251,425 $ 4,281 $ 290,573 $ 294,617 $ (4,044 ) 90 or more days delinquent: Not in foreclosure 661 809 (148 ) — — — In foreclosure — — — — — — 661 809 (148 ) — — — 256,367 252,234 4,133 290,573 294,617 (4,044 ) Distressed loans: Current through 89 days delinquent 3,179 6,202 (3,023 ) 28,806 43,043 (14,237 ) 90 or more days delinquent: Not in foreclosure 4,897 13,154 (8,257 ) 37,288 71,732 (34,444 ) In foreclosure 6,350 15,698 (9,348 ) 51,638 86,259 (34,621 ) 11,247 28,852 (17,605 ) 88,926 157,991 (69,065 ) 14,426 35,054 (20,628 ) 117,732 201,034 (83,302 ) $ 270,793 $ 287,288 $ (16,495 ) $ 408,305 $ 495,651 $ (87,346 )
Summary of Changes in Fair Value Included in Current Period Income	Following are the changes in fair value included in current period income by consolidated statement of income line item for financial statement items accounted for under the fair value option: Year ended December 31, 2019 Net gain on investments Net gain on loans acquired for sale Net loan servicing fees Net interest income Total (in thousands) Assets: Mortgage-backed securities at fair value $ 77,283 $ — $ — $ (12,853 ) $ 64,430 Credit risk transfer strips 30,326 — — — 30,326 Loans acquired for sale at fair value — 163,244 — — 163,244 Loans at fair value 714 — — 3,420 4,134 ESS at fair value (9,256 ) — — 10,291 1,035 Firm commitment to purchase credit risk transfer securities at fair value 60,943 99,305 — — 160,248 MSRs at fair value — — (464,353 ) — (464,353 ) $ 160,010 $ 262,549 $ (464,353 ) $ 858 $ (40,936 ) Liabilities: Interest-only security payable at fair value $ 10,302 $ — $ — $ — $ 10,302 Asset-backed financing of a VIE at fair value (7,553 ) — — (2,061 ) (9,614 ) $ 2,749 $ — $ — $ (2,061 ) $ 688 Year ended December 31, 2018 Net gain on investments Net gain on loans acquired for sale Net loan servicing fees Net interest income Total (in thousands) Assets: Mortgage-backed securities at fair value $ (11,262 ) $ — $ — $ (4,793 ) $ (16,055 ) Loans acquired for sale at fair value — (5,298 ) — — (5,298 ) Loans at fair value (23,696 ) — — 7,539 (16,157 ) ESS at fair value 8,500 — — 15,138 23,638 Firm commitment to purchase credit risk transfer securities at fair value 7,399 30,595 — — 37,994 MSRs at fair value — — (58,780 ) — (58,780 ) $ (19,059 ) $ 25,297 $ (58,780 ) $ 17,884 $ (34,658 ) Liabilities: Interest-only security payable at fair value $ (28,941 ) $ — $ — $ — $ (28,941 ) Asset-backed financing of a VIE at fair value 9,610 — — (577 ) 9,033 $ (19,331 ) $ — $ — $ (577 ) $ (19,908 ) Year ended December 31, 2017 Net gain on investments Net gain on loans acquired for sale Net loan servicing fees Net interest income Total (in thousands) Assets: Mortgage-backed securities at fair value $ 5,498 $ — $ — $ 5,367 $ 10,865 Loans acquired for sale at fair value — 97,940 — — 97,940 Loans at fair value 3,582 — — 32,239 35,821 ESS at fair value (19,350 ) — — 16,951 (2,399 ) MSRs at fair value — — (14,135 ) — (14,135 ) $ (10,270 ) $ 97,940 $ (14,135 ) $ 54,557 $ 128,092 Liabilities: Interest-only security payable $ 2,956 $ — $ — $ — $ 2,956 Asset-backed financing of a VIE at fair value (3,426 ) — — (1,781 ) (5,207 ) $ (470 ) $ — $ — $ (1,781 ) $ (2,251 )
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 year based on fair value on a nonrecurring basis: Real estate acquired in settlement of loans Level 1 Level 2 Level 3 Total (in thousands) December 31, 2019 $ — $ — $ 24,115 $ 24,115 December 31, 2018 $ — $ — $ 24,515 $ 24,515
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 year on assets held at year end that were remeasured at fair value on a nonrecurring basis: Year ended December 31, 2019 2018 2017 (in thousands) Real estate asset acquired in settlement of loans $ (2,155 ) $ (4,434 ) $ (11,882 ) MSRs at lower of amortized cost or fair value — — (5,876 ) $ (2,155 ) $ (4,434 ) $ (17,758 )
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 rights Exchangeable senior notes December 31, 2019 December 31, 2018 Instrument Carrying value Fair value Carrying value Fair value (in thousands) Notes payable secured by credit risk transfer and mortgage servicing assets $ 1,696,295 $ 1,705,544 $ 445,573 $ 444,403 Exchangeable senior notes $ 443,506 $ 462,117 $ 248,350 $ 247,172
Quantitative Summary of Key Inputs Used in Valuation of Loans at Fair Value (Excluding Loans Held in a VIE)	Following is a quantitative summary of key inputs used in the valuation of the Company’s “Level 3” loans at fair value: Key inputs (1) December 31, 2018 Fair value (in thousands) $ 117,732 Discount rate Range 2.8% – 19.6% Weighted average 12.0% Twelve-month projected housing price index change Range 3.1% – 3.7% Weighted average 3.4% Voluntary prepayment speed (2) Range 0.9% – 8.3% Weighted average 3.2% Total prepayment speed (3) Range 8.3% – 22.0% Weighted average 18.3% (1) Weighted-average inputs are based on fair value amounts of the loans. (2) Voluntary prepayment speed is measured using Life Voluntary Conditional Prepayment Rate (“CPR”). (3) Total prepayment speed is measured using Life Total CPR.
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, 2019 December 31, 2018 Fair value (in thousands) $ 178,586 $ 216,110 UPB of underlying loans (in thousands) $ 19,904,571 $ 23,196,033 Average servicing fee rate (in basis points) 34 34 Average ESS rate (in basis points) 19 19 Key inputs (1) Pricing spread (2) Range 3.0% – 3.3% 2.8% - 3.2% Weighted average 3.1% 3.1% Annual total prepayment speed (3) Range 8.7% – 16.2% 8.2% - 29.5% Weighted average 11.0% 9.7% Life (in years) Range 2.7 - 7.2 1.6 - 7.6 Weighted average 6.1 6.8 (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 CPR. Equivalent life information is included 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 Agreements: December 31, 2019 December 31, 2018 (dollars in thousands) Fair value CRT derivatives $ 115,863 $ 123,987 Deposits securing CRT arrangements $ 1,524,590 $ 1,146,501 UPB of loans in reference pools $ 24,824,616 $ 29,934,003 Key inputs (1) Discount rate Range 4.7% – 5.3% 6.6% – 7.5% Weighted average 5.2% 7.3% Voluntary prepayment speed (2) Range 16.4% – 18.5% 9.0% – 10.6% Weighted average 17.9% 9.9% Involuntary prepayment speed (3) Range 0.2% – 0.3% 0.2% – 0.2% Weighted average 0.3% 0.2% Remaining loss expectation (4) Range 0.1% – 0.1% 0.1% – 0.2% Weighted average 0.1% 0.2% (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. (4) Remaining loss expectation is measured as expected future contractual losses divided by the UPB of the reference loans.
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: December 31, 2019 December 31, 2018 Fair value (in thousands) (1) $ 11,154 $ 11,988 Key inputs (2) Pull-through rate Range 64.6% – 100% 45.4% - 100% Weighted average 93.3% 91.8% MSR fair value expressed as Servicing fee multiple Range 2.1 - 5.8 2.4 - 5.6 Weighted average 4.7 4.3 Percentage of UPB Range 0.7% - 2.2% 0.6% - 3.6% Weighted average 1.4% 2.2% (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 to derive the fair value of the CRT strips in the Company’s review and approval of the adjusted broker-provided fair values: December 31, 2019 (dollars in thousands) Carrying value CRT strips $ 54,930 Deposits securing CRT arrangements $ 445,194 UPB of loans in the reference pools $ 17,119,501 Key inputs (1) Discount rate 6.3% Voluntary prepayment speed (2) 23.4% Involuntary prepayment speed (3) 0.2% Remaining loss expectation (4) 0.1% (1) Weighted average inputs are based on the UPB of the reference 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.
Summary of Key Unobservable Inputs Used in Valuation of Firm Commitment to Purchase CRT Securities	The Company categorizes its firm commitment to purchase CRT securities as a “Level 3” fair value asset. The fair value of the firm commitment is estimated using a discounted cash flow approach to estimate the fair value of the CRT securities to be purchased less the contractual purchase price. Key inputs used in the estimation of fair value of the firm commitment are the discount rate and the voluntary and involuntary prepayment speeds of the loans in the reference pools. The firm commitment to purchase CRT securities is recognized initially as a component of Net gain on loans acquired for sale Net gain on investments Following is a quantitative summary of key unobservable inputs in the valuation of firm commitment to purchase CRT securities: December 31, 2019 December 31, 2018 (dollars in thousands) Fair value $ 109,513 $ 37,994 UPB of loans in the reference pools $ 38,738,396 $ 16,392,300 Key inputs (1) Discount rate 6.5 % 7.9 % Voluntary prepayment speed (2) 14.3 % 12.4 % Involuntary prepayment speed (3) 0.1 % 0.1 % Remaining loss expectation (4) 0.1 % 0.1 % (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 related 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: Year ended December 31, 2019 2018 2017 Fair value Fair value Fair value Amortized cost (MSR recognized and UPB of underlying loan amounts in thousands) MSR recognized $ 837,706 $ 356,755 $ 41,379 $ 248,930 UPB of underlying loans $ 59,951,884 $ 28,923,523 $ 3,724,642 $ 19,982,686 Weighted average annual servicing fee rate (in basis points) 31 26 25 25 Key inputs (1) Pricing spread (2) Range 5.6% – 9.9% 5.8% – 12.9% 7.6% – 7.6% 7.6% – 12.6% Weighted average 6.1% 6.9% 7.6% 7.6% Prepayment speed (3) Range 8.5% – 26.1% 3.2% – 35.3% 7.9% – 29.5% 3.2% – 31.1% Weighted average 11.7% 9.9% 10.7% 8.0% Life (in years) Range 3.1 – 7.7 2.3 – 11.9 2.8 – 8.5 2.6 – 11.9 Weighted average 6.8 7.6 7.3 8.3 Annual per-loan cost of servicing Range $78 – $78 $77 – $79 $79 – $79 $79 – $79 Weighted average $78 $79 $79 $79 (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. Equivalent life information is included 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: December 31, 2019 December 31, 2018 (Carrying value, UPB of underlying loans and effect on fair value amounts in thousands) Fair value $ 1,535,705 $ 1,162,369 UPB of underlying loans $ 131,024,381 $ 92,410,226 Weighted average annual servicing fee rate (in basis points) 28 25 Weighted average note interest rate 4.2% 4.2% Key inputs (1): Pricing spread (2) Range 6.8% – 9.9% 5.7% – 10.7% Weighted average 6.8% 5.8% Effect on fair value of: 5% adverse change $(20,666) $(13,872) 10% adverse change $(40,783) $(27,428) 20% adverse change $(79,453) $(53,626) Prepayment speed (3) Range 10.2% – 22.0% 8.1% – 27.1% Weighted average 12.1% 9.8% Life (in years) Range 2.4 - 6.5 2.7 - 7.3 Weighted average 6.3 7.1 Effect on fair value of: 5% adverse change $(35,768) $(21,661) 10% adverse change $(69,973) $(42,458) 20% adverse change $(134,068) $(81,660) Annual per-loan cost of servicing Range $77 – $78 $77 – $78 Weighted average $78 $78 Effect on fair value of: 5% adverse change $(9,964) $(8,298) 10% adverse change $(19,928) $(16,597) 20% adverse change $(39,856) $(33,194) (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. Equivalent life information is included for informational purposes.

Mortgage Backed Securities (Tab

Mortgage Backed Securities (Tables)	12 Months Ended
	Dec. 31, 2019
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: Year ended December 31, 2019 2018 2017 (in thousands) Balance at beginning of year $ 2,610,422 $ 989,461 $ 865,061 Purchases 1,250,289 1,810,877 251,872 Sales (704,178 ) — (1,206 ) Repayments (381,330 ) (173,862 ) (126,385 ) Changes in fair value included in income arising from: Amortization of purchase premiums (12,853 ) (4,792 ) (5,367 ) Valuation adjustments 77,283 (11,262 ) 5,486 64,430 (16,054 ) 119 Balance at end of year $ 2,839,633 $ 2,610,422 $ 989,461
Schedule of Investment in Mortgage Backed Securities	Following is a summary of the Company’s investment in MBS: December 31, 2019 December 31, 2018 Agency: (1) Principal balance Unamortized purchase premiums Accumulated valuation changes Fair value Principal balance Unamortized purchase premiums Accumulated valuation changes Fair value (in thousands) Fannie Mae $ 1,946,203 $ 29,657 $ 33,233 $ 2,009,093 $ 2,050,769 $ 39,488 $ (14,920 ) $ 2,075,337 Freddie Mac 809,595 11,083 9,862 830,540 530,734 6,702 (2,351 ) 535,085 $ 2,755,798 $ 40,740 $ 43,095 $ 2,839,633 $ 2,581,503 $ 46,190 $ (17,271 ) $ 2,610,422 (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)	12 Months Ended
	Dec. 31, 2019
Mortgage Loans On Real Estate [Abstract]
Summary of Distribution of Company's 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. Following is a summary of the distribution of the Company’s loans acquired for sale at fair value: Loan type December 31, 2019 December 31, 2018 (in thousands) Agency-eligible $ 3,626,038 $ 1,495,954 Held for sale to PLS — Government insured or guaranteed 490,383 86,308 Jumbo 13,437 44,221 Commercial real estate 1,015 8,559 Home equity lines of credit 4,632 — Repurchased pursuant to representations and warranties 12,920 8,915 $ 4,148,425 $ 1,643,957 Loans pledged to secure: Assets sold under agreements to repurchase $ 4,070,134 $ 1,436,437 Mortgage loan participation purchase and sale agreements — 185,442 $ 4,070,134 $ 1,621,879

Loans at Fair Value (Tables)

Loans at Fair Value (Tables)	12 Months Ended
	Dec. 31, 2019
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: December 31, 2019 December 31, 2018 Loan type Fair value Unpaid principal balance Fair value Unpaid principal balance (in thousands) Fixed interest rate jumbo loans held in a VIE $ 256,367 $ 251,425 $ 290,573 $ 294,617 Distressed loans: Nonperforming 11,247 28,852 88,926 157,991 Performing 3,179 6,202 28,806 43,043 14,426 35,054 117,732 201,034 $ 270,793 $ 286,479 $ 408,305 $ 495,651 Loans at fair value pledged to secure: Assets sold under agreements to repurchase $ 12,390 $ 108,693 Asset-backed financing of a VIE at fair value 256,367 290,573 $ 268,757 $ 399,266

Derivative and Credit Risk Tr_2

Derivative and Credit Risk Transfer Strips Assets (Tables)	12 Months Ended
	Dec. 31, 2019
Summary of Derivative and Credit Risk Transfer Assets	Derivative and credit risk transfer assets are summarized below: December 31, 2019 December 31, 2018 (in thousands) Derivative assets $ 147,388 $ 167,165 Credit risk transfer strips 54,930 — $ 202,318 $ 167,165
Summary of Investment In CRT Strips	Following is a summary of the Company’s investment in CRT strips: December 31, 2019 Credit risk transfer strips contractually restricted from sale (1) (in thousands) Through June 13, 2020 $ 17,629 To maturity 37,301 $ 54,930 CRT strips pledged to secure Assets sold under agreements to repurchase and Notes payable $ 54,930 (1) The terms of the agreement underlying the CRT securities restricts sales of the securities, other than sales under agreements to repurchase, without the approval of Fannie Mae, for specified periods from the date of issuance.
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 December 31, 2019 December 31, 2018 Fair value Fair value Notional Derivative Derivative Notional Derivative Derivative Instrument amount assets liabilities amount assets liabilities (in thousands) Not subject to master netting arrangements: CRT derivatives 24,824,616 $ 115,863 $ — 29,934,003 $ 123,987 $ — Interest rate lock commitments 3,199,680 11,726 572 1,688,516 12,162 174 Repurchase agreement derivatives 5,275 — 14,511 — Subject to master netting agreements ─ economic hedging purposes: Forward purchase contracts 5,883,198 7,525 3,600 3,072,223 14,845 43 Forward sale contracts 9,297,179 637 15,644 4,595,241 13 29,273 MBS put options 4,000,000 1,625 — 2,550,000 218 — MBS call options — — — 500,000 945 — Call options on interest rate futures 2,662,500 3,809 — 512,500 5,137 — Put options on interest rate futures 950,000 2,859 — 1,102,500 178 — Swap futures 2,075,000 4,347 — — — — Swaptions 2,700,000 — — — — — Bond futures 114,500 — — 815,000 — — Total derivative instruments before netting 153,666 19,816 171,996 29,490 Netting (6,278 ) (13,393 ) (4,831 ) (23,576 ) $ 147,388 $ 6,423 $ 167,165 $ 5,914 Margin deposits placed with derivatives counterparties, net $ 7,114 $ 18,744 Derivative assets pledged to secure: Notes payable $ 115,110 $ — Assets sold under agreements to repurchase $ 27,073 $ 87,976
Summary of Net Derivative Assets	Following is a summary of net derivative assets. December 31, 2019 December 31, 2018 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 Not subject to master netting arrangements: CRT derivatives $ 115,863 $ — $ 115,863 $ 123,987 $ — $ 123,987 Interest rate lock commitments 11,726 — 11,726 12,162 — 12,162 Repurchase agreement derivatives 5,275 — 5,275 14,511 — 14,511 132,864 — 132,864 150,660 — 150,660 Subject to master netting arrangements: Forward purchase contracts 7,525 — 7,525 14,845 — 14,845 Forward sale contracts 637 — 637 13 — 13 MBS put options 1,625 — 1,625 218 — 218 MBS call options — — — 945 — 945 Call options on interest rate futures 3,809 — 3,809 5,137 — 5,137 Put options on interest rate futures 2,859 — 2,859 178 — 178 Swap futures 4,347 — 4,347 — — — Netting — (6,278 ) (6,278 ) — (4,831 ) (4,831 ) 20,802 (6,278 ) 14,524 21,336 (4,831 ) 16,505 $ 153,666 $ (6,278 ) $ 147,388 $ 171,996 $ (4,831 ) $ 167,165
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. December 31, 2019 December 31, 2018 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 $ 115,863 $ — $ — $ 115,863 $ 123,987 $ — $ — $ 123,987 Interest rate lock commitments 11,726 — — 11,726 12,162 — — 12,162 RJ O’Brien & Associates, LLC 6,668 — — 6,668 5,315 — — 5,315 Deutsche Bank Securities LLC 5,398 — — 5,398 14,511 — — 14,511 Bank of America, N.A. 2,489 — — 2,489 — — — — Wells Fargo Securities, LLC 1,882 — — 1,882 2,800 — — 2,800 J.P. Morgan Securities LLC 1,551 — — 1,551 107 — — 107 Morgan Stanley & Co. LLC 821 — — 821 243 — — 243 Federal National Mortgage Association — — — — 5,619 — — 5,619 Citigroup Global Markets Inc. — — — — 971 — — 971 Other 990 — — 990 1,450 — — 1,450 $ 147,388 $ — $ — $ 147,388 $ 167,165 $ — $ — $ 167,165
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. December 31, 2019 December 31, 2018 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: Not subject to master netting arrangements — Interest rate lock commitments $ 572 $ — $ 572 $ 174 $ — $ 174 Subject to master netting arrangements: Forward purchase contracts 3,600 — 3,600 43 — 43 Forward sales contracts 15,644 — 15,644 29,273 — 29,273 Netting — (13,393 ) (13,393 ) — (23,576 ) (23,576 ) 19,244 (13,393 ) 5,851 29,316 (23,576 ) 5,740 19,816 (13,393 ) 6,423 29,490 (23,576 ) 5,914 Assets sold under agreements to repurchase: UPB 6,649,179 — 6,649,179 4,777,486 — 4,777,486 Unamortized debt issuance costs (289 ) — (289 ) (459 ) — (459 ) 6,648,890 — 6,648,890 4,777,027 — 4,777,027 $ 6,668,706 $ (13,393 ) $ 6,655,313 $ 4,806,517 $ (23,576 ) $ 4,782,941
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. December 31, 2019 December 31, 2018 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 $ 572 $ — $ — $ 572 $ 174 $ — $ — $ 174 J.P. Morgan Securities LLC 1,736,829 (1,736,829 ) — — 1,441,934 (1,441,934 ) — — Bank of America, N.A. 1,339,291 (1,339,291 ) — — 1,307,923 (1,307,584 ) — 339 Daiwa Capital Markets 906,439 (906,439 ) — — 254,332 (254,332 ) — — Credit Suisse Securities (USA) LLC 720,411 (719,902 ) — 509 512,662 (512,662 ) — — Morgan Stanley & Co. LLC 656,728 (656,728 ) — — 105,366 (105,366 ) — — Citigroup Global Markets Inc. 412,999 (411,933 ) — 1,066 99,626 (98,644 ) — 982 Mizuho Securities 392,038 (391,627 ) — 411 270,708 (270,708 ) — — RBC Capital Markets, L.P. 290,388 (290,388 ) — — 57,795 (57,795 ) — — BNP Paribas 116,155 (115,733 ) — 422 162,636 (162,357 ) — 279 Amherst Pierpont Securities LLC 80,309 (80,309 ) — — — — — — Federal National Mortgage Association 1,996 — — 1,996 12 — — 12 Deutsche Bank Securities LLC — — — — 495,974 (495,974 ) — — Wells Fargo Securities, LLC — — — — 70,130 (70,130 ) — — Other 1,447 — — 1,447 4,128 — — 4,128 $ 6,655,602 $ (6,649,179 ) $ — $ 6,423 $ 4,783,400 $ (4,777,486 ) $ — $ 5,914
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 income line items where such gains and losses are included: Year ended December 31, Derivative activity Income statement line 2019 2018 2017 (in thousands) Interest rate lock commitments Net gain on loans acquired for sale $ (834 ) $ 7,356 $ 81,309 CRT derivatives Net gain on investments $ 70,048 $ 112,275 $ 134,761 Repurchase agreement derivatives Interest expense $ 24 $ 191 $ 116 Hedged item: Interest rate lock commitments and loans acquired for sale Net gain on loans acquired for sale $ (91,084 ) $ 25,334 $ (31,245 ) Mortgage servicing rights Net loan servicing fees $ 80,622 $ (35,550 ) $ (2,512 ) Fixed-rate assets and LIBOR- indexed repurchase agreements Net gain on investments $ 28,785 $ (4,152 ) $ (18,468 )
Derivative Arising From Derivative Contracts [Member]
Summary of Activity in Notional Amount for Derivative Contracts	The following tables summarize the notional amount activity for derivative contracts used for economic hedging purposes: Notional amounts, year ended December 31, 2019 Beginning Dispositions/ End Instrument of year Additions expirations of year (in thousands) Forward purchase contracts 3,072,223 246,730,665 (243,919,690 ) 5,883,198 Forward sales contracts 4,595,241 322,636,252 (317,934,314 ) 9,297,179 MBS put options 2,550,000 56,150,000 (54,700,000 ) 4,000,000 MBS call options 500,000 13,200,000 (13,700,000 ) — Call options on interest rate futures 512,500 30,752,000 (28,602,000 ) 2,662,500 Put options on interest rate futures 1,102,500 31,662,400 (31,814,900 ) 950,000 Swap futures — 5,371,970 (3,296,970 ) 2,075,000 Swaptions — 3,700,000 (1,000,000 ) 2,700,000 Bond futures 815,000 23,330,100 (24,030,600 ) 114,500 Notional amounts, year ended December 31, 2018 Beginning Dispositions/ End Instrument of year Additions expirations of year (in thousands) Forward purchase contracts 1,996,235 97,737,906 (96,661,918 ) 3,072,223 Forward sales contracts 2,565,271 129,544,573 (127,514,603 ) 4,595,241 MBS put options 2,375,000 9,575,000 (9,400,000 ) 2,550,000 MBS call options — 2,000,000 (1,500,000 ) 500,000 Call options on interest rate futures — 3,487,500 (2,975,000 ) 512,500 Put options on interest rate futures 550,000 13,302,500 (12,750,000 ) 1,102,500 Swap futures 275,000 — (275,000 ) — Bond futures — 5,274,400 (4,459,400 ) 815,000 Eurodollar future sale contracts 937,000 149,597 (1,086,597 ) — Notional amounts, year ended December 31, 2017 Beginning Dispositions/ End Instrument of year Additions expirations of year (in thousands) Forward purchase contracts 4,840,707 71,768,061 (74,612,533 ) 1,996,235 Forward sales contracts 6,148,242 95,889,432 (99,472,403 ) 2,565,271 MBS put options 925,000 9,225,000 (7,775,000 ) 2,375,000 MBS call options 750,000 550,000 (1,300,000 ) — Call options on interest rate futures 200,000 825,000 (1,025,000 ) — Put options on interest rate futures 550,000 7,150,000 (7,150,000 ) 550,000 Swap futures 150,000 1,650,000 (1,525,000 ) 275,000 Eurodollar future sale contracts 1,351,000 404,000 (818,000 ) 937,000 Treasury future buy contracts — 110,700 (110,700 ) — Treasury future sale contracts — 110,700 (110,700 ) —

Real Estate Acquired in Settl_2

Real Estate Acquired in Settlement of Loans (Tables)	12 Months Ended
	Dec. 31, 2019
Other Real Estate [Abstract]
Summary of Financial Information Relating to REO	Following is a summary of financial information relating to REO: Year ended December 31, 2019 2018 2017 (in thousands) Balance at beginning of year $ 85,681 $ 162,865 $ 274,069 Transfers: From loans at fair value and advances 23,672 32,578 87,202 From real estate held for investment (1) 30,432 3,401 — To real estate held for investment — (5,183 ) (16,530 ) Results of REO: Valuation adjustments, net (6,527 ) (17,323 ) (27,505 ) Gain on sale, net 7,298 8,537 12,550 771 (8,786 ) (14,955 ) Sales (74,973 ) (99,194 ) (166,921 ) Balance at end of year $ 65,583 $ 85,681 $ 162,865 December 31, 2019 December 31, 2018 (in thousands) REO pledged to secure assets sold under agreements to repurchase $ 40,938 $ 1,939 REO held in a consolidated subsidiary whose stock is pledged to secure financings of such properties — 38,259 $ 40,938 $ 40,198 (1) During the quarter ended June 30, 2019, the Company committed to liquidate its real estate held for investment and transferred its holdings to real estate acquired in settlement of loans.

Mortgage Servicing Rights (Tabl

Mortgage Servicing Rights (Tables)	12 Months Ended
	Dec. 31, 2019
Text Block [Abstract]
Summary of MSRs Carried at Fair Value	Following is a summary of MSRs carried at fair value: Year ended December 31, 2019 2018 2017 (in thousands) Balance at beginning of year $ 1,162,369 $ 91,459 $ 64,136 Transfer of mortgage servicing rights from mortgage servicing rights carried at lower of amortized cost or fair value pursuant to a change in accounting principle — 773,035 — Balance after reclassification 1,162,369 864,494 64,136 Purchases — — 79 Sales (17 ) (100 ) — MSRs resulting from loan sales 837,706 356,755 41,379 Changes in fair value: Due to changes in valuation inputs used in valuation model (1) (262,031 ) 60,772 (9,762 ) Other changes in fair value (2) (202,322 ) (119,552 ) (4,373 ) (464,353 ) (58,780 ) (14,135 ) Balance at end of year $ 1,535,705 $ 1,162,369 $ 91,459 December 31, 2019 December 31, 2018 (in thousands) Fair value of mortgage servicing rights pledged to secure Assets sold under agreements to repurchase and $ 1,510,651 $ 1,139,582 (1) Primarily reflects changes in pricing spread (discount rate) and prepayment speed inputs, primarily due to changes in market interest rates. (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 Year ended December 31, 2019 2018 2017 (in thousands) Contractually-specified servicing fees $ 295,390 $ 204,663 $ 164,776 Ancillary and other fees: Late charges 1,658 974 718 Other 22,441 7,088 5,805 $ 319,489 $ 212,725 $ 171,299
Summary of MSRs Carried at Lower of Amortized Cost or Fair Value	Following is a summary of MSRs carried at lower of amortized cost or fair value: Year ended December 31, 2018 2017 (in thousands) Amortized cost: Balance at beginning of year $ 772,870 $ 606,103 Transfer of mortgage servicing right to mortgage servicing rights carried at fair value pursuant to a change in accounting principle (772,870 ) — Balance after reclassification — 606,103 MSRs resulting from mortgage loan sales — 248,930 Amortization — (81,624 ) Sales — (539 ) Balance at end of year — 772,870 Valuation allowance: Balance at beginning of year (19,548 ) (13,672 ) Reduction pursuant to a change in accounting principle 19,548 — Balance after reclassification — (13,672 ) Additions to valuation allowance — (5,876 ) Balance at end of year — (19,548 ) MSRs, net $ — $ 753,322 Fair value at beginning of year $ 626,334 Fair value at end of year $ 772,940

Assets Sold Under Agreements _2

Assets Sold Under Agreements to Repurchase (Tables)	12 Months Ended
	Dec. 31, 2019
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: Year ended December 31, 2019 2018 2017 (dollars in thousands) Weighted average interest rate (1) 3.25 % 3.25 % 2.49 % Average balance $ 5,600,469 $ 3,901,772 $ 3,332,084 Total interest expense (2) $ 178,211 $ 115,383 $ 93,580 Maximum daily amount outstanding $ 8,577,065 $ 6,665,118 $ 4,242,600 (1) Excludes the effect of amortization of net debt issuance premiums of $4.0 million and $11.7 million for the years ended December 31, 2019 and 2018, respectively, and net debt issuance costs of $8.3 million for the year ended December 31, 2017. (2) The Company’s interest expense relating to assets sold under agreements to repurchase for the years ended December 31, 2019, 2018, and 2017 includes recognition of incentives it received for financing certain of its loans acquired for sale satisfying certain consumer debt relief characteristics under a master repurchase agreement. During the years ended December 31, 2019, 2018, and 2017, the Company recognized $10.8 million, $19.7 million, and $3.1 million, respectively, in such incentives as a reduction of interest expense. The master repurchase agreement expired on August 21, 2019. December 31, 2019 December 31, 2018 (dollars in thousands) Carrying value: Unpaid principal balance $ 6,649,179 $ 4,777,486 Unamortized debt issuance costs, net (289 ) (459 ) $ 6,648,890 $ 4,777,027 Weighted average interest rate 2.85 % 3.38 % Available borrowing capacity (1): Committed $ — $ 783,415 Uncommitted 2,278,264 2,325,246 $ 2,278,264 $ 3,108,661 Margin deposits placed with counterparties included in Other $ 91,871 $ 43,676 Assets securing agreements to repurchase: Mortgage-backed securities $ 2,839,633 $ 2,610,422 Loans acquired for sale at fair value $ 4,070,134 $ 1,436,437 Loans at fair value $ 12,390 $ 108,693 CRT strips $ 27,073 $ — CRT derivatives $ — $ 87,976 Real estate acquired in settlement of loans $ 40,938 $ 40,198 Real estate held for investment $ — $ 23,262 MSRs (2) $ 1,354,907 $ 1,139,582 Deposits securing CRT arrangements $ 445,194 $ 1,146,501 (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 Freddie Mac and Fannie Mae MSRs are pledged as collateral under both Assets sold under agreements to repurchase .
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 December 31, 2019 Unpaid principal balance (in thousands) Within 30 days $ 3,322,037 Over 30 to 90 days 3,036,754 Over 90 days to 180 days 290,388 Over 180 days to one year — $ 6,649,179 Weighted average maturity (in months) 1.4
Summary of Assets Sold under Agreements to Repurchase by Counterparty	Securities Counterparty Amount at risk Weighted average maturity (in thousands) JPMorgan Chase & Co. $ 22,279 January 21, 2020 Bank of America, N.A. $ 12,078 January 14, 2020 Daiwa Capital Markets America Inc. $ 28,234 January 17, 2020 Mizuho Securities $ 12,214 January 11, 2020 Amherst Pierpont Securities LLC $ 2,404 February 14, 2020
CRT Agreements [Member]
Summary of Assets Sold under Agreements to Repurchase by Counterparty	CRT arrangements Counterparty Amount at risk Weighted average maturity (in thousands) JPMorgan Chase & Co. $ 88,089 January 31, 2020
Loans, RE and MSRs [Member]
Summary of Assets Sold under Agreements to Repurchase by Counterparty	Loans, REO and MSRs Counterparty Amount Weighted average maturity Facility maturity (in thousands) Citibank, N.A. $ 283,315 March 22, 2020 August 4, 2020 Credit Suisse First Boston Mortgage Capital LLC $ 227,577 March 18, 2020 April 24, 2020 JPMorgan Chase & Co. $ 84,911 February 18, 2020 October 9, 2020 Bank of America, N.A. $ 43,604 January 30, 2020 March 12, 2020 Morgan Stanley $ 41,672 March 17, 2020 August 21, 2020 Royal Bank of Canada $ 15,902 April 13, 2020 February 28, 2020 BNP Paribas $ 6,370 March 16, 2020 July 31, 2020

Mortgage Loan Participation P_2

Mortgage Loan Participation Purchase and Sale Agreements (Tables)	12 Months Ended
	Dec. 31, 2019
Text Block [Abstract]
Summary of Mortgage Loan Participation Purchase and Sale Agreements	Mortgage loan participation purchase and sale agreements are summarized below: Year ended December 31, 2019 2018 2017 (dollars in thousands) Weighted average interest rate (1) 3.53 % 3.42 % 2.34 % Average balance $ 40,036 $ 64,512 $ 61,807 Total interest expense $ 1,570 $ 2,422 $ 1,593 Maximum daily amount outstanding $ 207,065 $ 287,862 $ 136,854 (1) Excludes the effect of amortization of debt issuance costs of $158,000, $217,000 and $125,000 for the years ended December 31, 2019, 2018 and 2017, respectively. December 31, 2018 (dollars in thousands) Carrying value: Amount outstanding $ 178,726 Unamortized debt issuance costs (87 ) $ 178,639 Weighted average interest rate 3.77 % Loans acquired for sale pledged to secure mortgage loan participation purchase and sale agreements $ 185,442

Notes Payable (Tables)

Notes Payable (Tables)	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Summary of Financial Information Relating to Note Payable	Following is a summary of financial information relating to the notes payable: Year ended December 31, 2019 2018 2017 (dollars in thousands) Weighted average interest rate (1) 4.70 % 4.68 % 5.71 % Average balance $ 1,101,501 $ 300,035 $ 145,638 Total interest expense $ 53,968 $ 14,623 $ 12,634 Maximum daily amount outstanding $ 1,742,227 $ 450,000 $ 275,106 (1) Excludes the effect of amortization of debt issuance costs of $2.2 million, $681,000 and $4.2 million for the years ended December 31, 2019, 2018 and 2017, respectively. December 31, 2019 December 31, 2018 (dollars in thousands) Carrying value: Amount outstanding $ 1,702,262 $ 450,000 Unamortized debt issuance costs (5,967 ) (4,427 ) $ 1,696,295 $ 445,573 Weighted average interest rate 4.30 % 4.86 % Assets securing notes payable: MSRs (1) $ 1,510,651 $ 1,139,582 CRT Agreements: Deposits securing CRT arrangements $ 1,524,590 $ — Derivative assets $ 115,110 $ — (1) Beneficial interests in Freddie Mac and Fannie Mae MSRs are pledged as collateral for both Assets sold under agreements to repurchase .

Exchangeable Senior Notes (Tabl

Exchangeable Senior Notes (Tables)	12 Months Ended
	Dec. 31, 2019
Text Block [Abstract]
Summary of Financial Information Relating to Exchangeable Notes	Following is financial information relating to the Exchangeable Notes: Year ended December 31, 2019 2018 2017 (in thousands) Average balance $ 279,207 $ 250,000 $ 250,000 Total interest expense $ 17,037 $ 14,601 $ 14,535 December 31, 2019 December 31, 2018 (in thousands) Carrying value: UPB $ 460,000 $ 250,000 Unamortized debt issuance costs and conversion option (16,494 ) (1,650 ) $ 443,506 $ 248,350

Asset-Backed Financing of a V_2

Asset-Backed Financing of a Variable Interest Entity at Fair Value (Tables)	12 Months Ended
	Dec. 31, 2019
Text Block [Abstract]
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: Year ended December 31, 2019 2018 2017 (dollars in thousands) Average balance $ 267,539 $ 288,244 $ 331,409 Total interest expense $ 11,324 $ 10,821 $ 13,184 Weighted average interest rate (1) 3.46 % 3.55 % 3.39 % (1) Excludes the effect of debt issuance costs of $2.1 million, $577,000 and $1.8 million, for the year ended December 31, 2019, 2018 and 2017, respectively. December 31, 2019 December 31, 2018 (dollars in thousands) Fair value $ 243,360 $ 276,499 UPB $ 239,169 $ 281,922 Weighted average interest rate 3.51 % 3.51 %

Liability for Losses Under Re_2

Liability for Losses Under Representations and Warranties (Tables)	12 Months Ended
	Dec. 31, 2019
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: Year ended December 31, 2019 2018 2017 (in thousands) Balance, beginning of year $ 7,514 $ 8,678 $ 15,350 Provision for losses: Pursuant to loan sales 3,778 2,531 3,147 Reduction in liability due to change in estimate (3,550 ) (3,707 ) (9,679 ) (Losses incurred) recoveries, net (128 ) 12 (140 ) Balance, end of year $ 7,614 $ 7,514 $ 8,678 UPB of loans subject to representations and warranties at end of year $ 122,163,186 $ 90,427,100 $ 71,416,333

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2019
Commitments And Contingencies Disclosure [Abstract]
Company's Outstanding Contractual Commitments	The following table summarizes the Company’s outstanding contractual commitments: December 31, 2019 (in thousands) Commitments to purchase loans acquired for sale $ 3,199,680 Face amount of firm commitment to purchase credit risk transfer securities $ 1,502,203

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2019
Equity [Abstract]
Schedule of Preferred Shares of Beneficial Interest	Preferred shares of beneficial interest are summarized below: Dividends per share, year ended December 31, Series Description (1) Number of shares Liquidation preference Issuance discount Carrying value 2019 2018 2017 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 $ 2.03 $ 2.03 $ 1.59 B 8.00% Issued July 2017 7,800 195,000 6,465 188,535 $ 2.00 $ 2.00 $ 0.89 12,400 $ 310,000 $ 10,293 $ 299,707 (1) Par value is $0.01 per share.
Summary of Underwritten Offerings of Common Shares	During 2019, the Company completed the following underwritten offerings of common shares: Date Number of common shares Average price per share Gross proceeds Net proceeds (Amounts in thousands, except average price per share) February 14, 2019 7,000 $ 20.64 $ 144,480 $ 142,470 May 9, 2019 8,127 $ 21.15 171,877 169,605 August 8, 2019 9,200 $ 21.75 200,100 197,773 December 13, 2019 9,200 $ 22.10 203,320 200,904 33,527 $ 21.47 $ 719,777 $ 710,752
Summary of Activities under ATM Equity Offering Program	Following is a summary of the activities under the ATM equity offering program: Quarter ended Number of common shares Average price per share Gross proceeds Net proceeds (Amounts in thousands, except average price per share) March 31, 2019 221 $ 20.76 $ 4,588 $ 4,542 June 30, 2019 2,068 $ 21.68 $ 44,844 $ 44,395 September 30, 2019 2,537 $ 22.17 $ 56,256 $ 55,694 December 31, 2019 637 $ 22.32 $ 14,217 $ 14,074 5,463 $ 21.95 $ 119,905 $ 118,705
Summary of Share Repurchase Activity	The following table summarizes the Company’s share repurchase activity: Year ended December 31, Cumulative 2018 2017 2016 2015 total (1) (in thousands) Common shares repurchased 671 5,647 7,368 1,045 14,731 Cost of common shares repurchased $ 10,719 $ 91,198 $ 98,370 $ 16,338 $ 216,625 (1) Amounts represent the share repurchase program total from its inception in August 2015 through December 31, 2019.

Net Gain on Investments (Tables

Net Gain on Investments (Tables)	12 Months Ended
	Dec. 31, 2019
Investments Debt And Equity Securities [Abstract]
Summary of Net Gain (Loss) on Investments	Net gain on investments is summarized below: Year ended December 31, 2019 2018 2017 (in thousands) From nonaffiliates: Mortgage-backed securities $ 77,283 $ (11,262 ) $ 5,498 Loans at fair value: Held in a VIE 7,883 (8,499 ) 4,266 Distressed (7,169 ) (15,197 ) (684 ) CRT arrangements 110,676 92,943 123,728 Firm commitment to purchase CRT securities 60,943 7,399 — Asset-backed financing of a VIE at fair value (7,553 ) 9,610 (3,426 ) Hedging derivatives 28,785 (4,152 ) (18,468 ) 270,848 70,842 110,914 From PFSI—ESS (7,530 ) 11,084 (14,530 ) $ 263,318 $ 81,926 $ 96,384

Net Gain on Loans Acquired fo_2

Net Gain on Loans Acquired for Sale (Tables)	12 Months Ended
	Dec. 31, 2019
Text Block [Abstract]
Schedule of Net Gain on Loans Acquired for Sale	Net gain on loans acquired for sale is summarized below: Year ended December 31, 2019 2018 2017 (in thousands) From nonaffiliates: Cash loss: Loans $ (687,317 ) $ (363,271 ) $ (209,898 ) Hedging activities (88,633 ) 9,172 (15,288 ) (775,950 ) (354,099 ) (225,186 ) Non-cash gain: Recognition of fair value of firm commitment to purchase CRT securities 99,305 30,595 — Receipt of MSRs in mortgage loan sale transactions 837,706 356,755 290,309 Provision for losses relating to representations and warranties provided in mortgage loan sales: Pursuant to loans sales (3,778 ) (2,531 ) (3,147 ) Reduction in liability due to change in estimate 3,550 3,707 9,679 (228 ) 1,176 6,532 Change in fair value of loans and derivatives held at end of year: IRLCs (834 ) 7,356 855 Loans (1,765 ) (9,685 ) 5,879 Hedging derivatives (2,451 ) 16,162 (15,957 ) (5,050 ) 13,833 (9,223 ) 931,733 402,359 287,618 Total from nonaffiliates 155,783 48,260 62,432 From PFSI—cash gain 14,381 10,925 12,084 $ 170,164 $ 59,185 $ 74,516

Net Loan Servicing Fees (Tables

Net Loan Servicing Fees (Tables)	12 Months Ended
	Dec. 31, 2019
Mortgage Loan Servicing Fees [Abstract]
Summary of Net Loan Servicing Fees	Net loan servicing fees are summarized below: Year ended December 31, 2019 2018 2017 (in thousands) From nonaffiliates: Contractually specified (1) $ 295,390 $ 204,663 $ 164,776 Other 24,099 8,062 6,523 Effect of MSRs: Carried at fair value: Realization of cashflows (202,322 ) (119,552 ) (9,762 ) Market changes (262,031 ) 60,772 (4,373 ) (464,353 ) (58,780 ) (14,135 ) Carried at lower of amortized cost or fair value: Amortization — — (81,624 ) Increase in impairment valuation allowance — — (5,876 ) Gain on sale — — 660 Gain (losses) on hedging derivatives, net 80,622 (35,550 ) (2,512 ) (383,731 ) (94,330 ) (103,487 ) Net servicing fees from non-affiliates (64,242 ) 118,395 67,812 From PFSI—MSR recapture income 5,324 2,192 1,428 Net loan servicing fees $ (58,918 ) $ 120,587 $ 69,240 Average servicing portfolio $ 110,075,179 $ 80,500,212 $ 63,836,843 (1) Includes contractually specified servicing fees, net of Agency guarantee fees.

Net Interest Income (Tables)

Net Interest Income (Tables)	12 Months Ended
	Dec. 31, 2019
Banking And Thrift Interest [Abstract]
Summary of Net Interest Income	Net interest income is summarized below: Year ended December 31, 2019 2018 2017 (in thousands) Interest income: From nonaffiliates: Cash and short-term investments $ 4,559 $ 852 $ 576 Mortgage-backed securities 78,450 55,487 29,438 Loans acquired for sale at fair value 121,387 75,610 53,164 Loans at fair value: Held in a VIE 11,734 11,813 14,425 Distressed 3,848 21,666 63,613 Deposits securing CRT arrangements 34,229 15,441 4,291 Placement fees relating to custodial funds 52,587 26,065 12,517 Other 800 700 201 307,594 207,634 178,225 From PFSI—ESS 10,291 15,138 16,951 317,885 222,772 195,176 Interest expense: To nonaffiliates: Assets sold under agreements to repurchase (1) 178,211 115,383 93,580 Mortgage loan participation purchase and sale agreements 1,570 2,422 1,593 Exchangeable Notes 17,037 14,601 14,535 Notes payable 53,968 14,623 12,634 Asset-backed financings of a VIE at fair value 11,324 10,821 13,184 Interest shortfall on repayments of loans serviced for Agency securitizations 25,776 7,324 5,928 Interest on loan impound deposits 3,258 2,535 1,879 291,144 167,709 143,333 To PFSI—Assets sold under agreement to repurchase 6,302 7,462 8,038 297,446 175,171 151,371 Net interest income $ 20,439 $ 47,601 $ 43,805 (1) In 2017, the Company entered into a master repurchase agreement that provides the Company with incentives to finance loans approved for satisfying certain consumer relief characteristics as provided in the agreement. During the years ended December 31, 2019, 2018 and 2017 the Company included $10.8 million, $19.7 million and $3.1 million, respectively, of such incentives as a reduction of Interest expense

Share-Based Compensation Plans

Share-Based Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2019
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: Year ended December 31, 2019 2018 2017 (in thousands) Grants: Restricted share units 96 129 136 Performance share units 116 116 126 Total share units granted 212 245 262 Grant date fair value: Restricted share units $ 1,978 $ 2,281 $ 2,316 Performance share units 2,380 1,542 1,675 Total grant date value of share units $ 4,358 $ 3,823 $ 3,991 Vestings: Restricted share units 227 261 284 Performance share units (1) 118 27 — Total share units vested 345 288 284 Forfeitures: Restricted share units — 2 13 Performance share units 1 — — Total share units forfeited 1 2 13 Compensation expense relating to share-based grants $ 5,530 $ 5,318 $ 4,904 (1) The actual number of performance-based RSUs vested during the year ended December 31, 2019 was 141,000 common shares, which is approximately 119% of the 118,000 originally granted performance-based RSUs, due to the Company exceeding the established performance targets.
Summary of Restricted Share Units and Performance Share Units Expected to Vest	December 31, 2019 Restricted share units Performance share units Shares expected to vest: Number of units (in thousands) 229 234 Grant date average fair value per unit $ 19.01 $ 17.28 Average remaining vesting period (months) 8 8

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Schedule of Tax Characterization of Distributions	The approximate tax characterization of the Company’s distributions is as follows: Year ended December 31, Ordinary income Long term capital gain Return of capital 2019 66 % 0 % 34 % 2018 49 % 0 % 51 % 2017 71 % 29 % 0 %
Summary of Company's (Benefit from) Provision for Income Taxes	The following table details the Company’s (benefit from) provision for income taxes which relates primarily to the TRS for the years presented: Year ended December 31, 2019 2018 2017 (in thousands) Current (benefit) expense : Federal $ (120 ) $ 19 $ 251 State 12 6 57 Total current (benefit) expense (108 ) 25 308 Deferred (benefit) expense: Federal (39,592 ) 7,587 3,824 State 3,984 (2,422 ) 2,665 Total deferred (benefit) expense (35,608 ) 5,165 6,489 Total (benefit from) provision for income taxes $ (35,716 ) $ 5,190 $ 6,797
Reconciliation of Company's (Benefit from) Provision for Income Taxes	The following table is a reconciliation of the Company’s (benefit from) provision for income taxes at statutory rates to the (benefit from) provision for income taxes at the Company’s effective rate for the years presented: Year ended December 31, 2019 2018 2017 Amount Rate Amount Rate Amount Rate (dollars in thousands) Federal income tax expense at statutory tax rate $ 40,035 21.0 % $ 33,177 21.0 % $ 43,591 35.0 % Effect of non-taxable REIT income (79,467 ) (41.7 )% (26,647 ) (16.9 )% (25,754 ) (20.7 )% State income taxes, net of federal benefit (7,417 ) (3.9 )% (2,044 ) (1.3 )% 1,687 1.4 % Effect of federal statutory rate change — (— )% — (— )% (12,992 ) (10.4 )% Valuation allowance 13,612 7 % — 0 % — 0 % Other (2,479 ) (1.2 )% 704 0.4 % 265 0.2 % (Benefit from) provision for income taxes $ (35,716 ) (18.8 )% $ 5,190 3.2 % $ 6,797 5.5 %
Components of (Benefit from) Provision for Deferred Income Taxes	The Company’s components of the (benefit from) provision for deferred income taxes are as follows: Year ended December 31, 2019 2018 2017 (in thousands) Real estate valuation loss $ 1,140 $ 1,565 $ 3,476 Mortgage servicing rights (212 ) 4,797 15,516 Net operating loss carryforward (56,339 ) (1,109 ) 4,333 Liability for losses under representations and warranties 111 405 2,652 Excess interest expense disallowance 4,667 234 (7,304 ) Effect of federal statutory rate change — — (12,992 ) Other 1,413 (727 ) 808 Valuation allowance 13,612 — — Total (benefit from) provision for deferred income taxes $ (35,608 ) $ 5,165 $ 6,489
Components of Income Taxes Payable	The components of income taxes payable are as follows: December 31, 2019 December 31, 2018 (in thousands) Taxes currently receivable $ (259 ) $ (1,160 ) Deferred income taxes payable 2,078 37,686 Income taxes payable $ 1,819 $ 36,526
Summary of Deferred Income Tax Assets and Liabilities	The tax effects of temporary differences that gave rise to deferred income tax assets and liabilities are presented below: December 31, 2019 December 31, 2018 (in thousands) Deferred income tax assets: Net operating loss carryforward $ 97,236 $ 40,897 Excess interest expense disallowance 15,234 19,901 REO valuation loss 1,438 2,578 Liability for losses under representations and warranties 1,900 2,011 Valuation allowance (13,612 ) — Other 162 1,576 Gross deferred tax assets 102,358 66,962 Deferred income tax liabilities: Mortgage servicing rights 104,436 104,648 Other — — Gross deferred tax liabilities 104,436 104,648 Net deferred income tax liability $ 2,078 $ 37,686

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2019
Earnings Per Share [Abstract]
Summary of Basic and Diluted Earnings per Share	The following table summarizes the basic and diluted earnings per share calculations: Year ended December 31, 2019 2018 2017 (in thousands except per share amounts) Net income $ 226,357 $ 152,798 $ 117,749 Dividends on preferred shares (24,938 ) (24,938 ) (15,267 ) Effect of participating securities—share-based compensation awards (566 ) (750 ) (991 ) Net income attributable to common shareholders $ 200,853 $ 127,110 $ 101,491 Net income attributable to common shareholders $ 200,853 $ 127,110 $ 101,491 Interest on Exchangeable Notes, net of income taxes (1) 11,827 10,637 8,757 Diluted net income attributable to common shareholders $ 212,680 $ 137,747 $ 110,248 Weighted average basic shares outstanding 78,990 60,898 66,144 Dilutive securities: Shares issuable under share-based compensation plan 254 — — Shares issuable pursuant to exchange of the Exchangeable Notes (1) 8,467 8,467 8,467 Diluted weighted average number of shares outstanding 87,711 69,365 74,611 Basic earnings per share $ 2.54 $ 2.09 $ 1.53 Diluted earnings per share $ 2.42 $ 1.99 $ 1.48 (1) During 2019, the Company issued the 2024 Notes. The 2024 Notes include a cash conversion option. The Company intends to cash settle the 2024 Exchangeable Notes. Therefore, the effect of conversion of the 2024 Notes is excluded from diluted earnings per share.
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: Year ended December 31, 2019 2018 2017 (in thousands) Shares issuable under share-based compensation plan 152 252 157

Segments (Tables)

Segments (Tables)	12 Months Ended
	Dec. 31, 2019
Segment Reporting [Abstract]
Financial Highlights by Operating Segment	Financial highlights by operating segment are summarized below: Credit Interest rate sensitive sensitive Correspondent Year ended December 31, 2019 strategies strategies production Corporate Total (in thousands) Net investment income: Net gain on investments $ 164,413 $ 98,905 $ — $ — $ 263,318 Net gain on loans acquired for sale (1) 51,014 119,150 — 170,164 Net loan servicing fees — (58,918 ) — — (58,918 ) Net interest income (expense): Interest income 39,343 155,176 120,974 2,392 317,885 Interest expense (67,412 ) (144,513 ) (85,521 ) — (297,446 ) (28,069 ) 10,663 35,453 2,392 20,439 Other 4,507 — 88,159 1,146 93,812 191,865 50,650 242,762 3,538 488,815 Expenses: Loan fulfillment and servicing fees payable to PFSI 2,213 46,584 160,610 — 209,407 Management fees — — — 36,492 36,492 Other 7,476 2,918 17,559 24,322 52,275 9,689 49,502 178,169 60,814 298,174 Pretax income (loss) $ 182,176 $ 1,148 $ 64,593 $ (57,276 ) $ 190,641 Total assets at year end $ 2,364,749 $ 4,993,840 $ 4,216,806 $ 195,956 $ 11,771,351 (1) During the quarter ended March 31, 2019, the chief operating decision maker began attributing a portion of the initial fair value the Company recognizes relating to its firm commitment to purchase CRT securities upon the sale of loans to the correspondent production segment in recognition of pricing changes in the correspondent production segment. Accordingly, the Company allocated $49.0 million of the initial firm commitment recognized in Net gain on loans acquired for sale Credit Interest rate sensitive sensitive Correspondent Year ended December 31, 2018 strategies strategies production Corporate Total (in thousands) Net investment income: Net gain on investments $ 84,943 $ (3,017 ) $ — $ — $ 81,926 Net gain on loans acquired for sale 30,740 — 28,445 — 59,185 Net loan servicing fees 29 120,558 — — 120,587 Net interest income (expense): Interest income 37,786 108,366 75,068 1,552 222,772 Interest expense (41,523 ) (92,294 ) (41,354 ) — (175,171 ) (3,737 ) 16,072 33,714 1,552 47,601 Other (1,704 ) — 43,447 25 41,768 110,271 133,613 105,606 1,577 351,067 Expenses: Loan fulfillment and servicing fees payable to PFSI 7,561 34,484 81,350 — 123,395 Management fees — — — 24,465 24,465 Other 15,459 697 7,784 21,279 45,219 23,020 35,181 89,134 45,744 193,079 Pretax income (loss) $ 87,251 $ 98,432 $ 16,472 $ (44,167 ) $ 157,988 Total assets at year end $ 1,602,776 $ 4,373,488 $ 1,698,656 $ 138,441 $ 7,813,361 Credit Interest rate sensitive sensitive Correspondent Year ended December 31, 2017 strategies strategies production Corporate Total (in thousands) Net investment income: Net gain on investments $ 123,774 $ (27,390 ) $ — $ — $ 96,384 Net gain on loans acquired for sale 208 — 74,308 — 74,516 Net loan servicing fees 134 69,106 — — 69,240 Net interest income (expense): Interest income 69,008 72,870 52,522 776 195,176 Interest expense (53,434 ) (62,809 ) (35,128 ) — (151,371 ) 15,574 10,061 17,394 776 43,805 Other (6,290 ) — 40,279 6 33,995 133,400 51,777 131,981 782 317,940 Expenses: Loan fulfillment and servicing fees payable to PFSI 15,611 27,446 80,366 — 123,423 Management fees — — — 22,584 22,584 Other 15,575 1,648 8,677 21,487 47,387 31,186 29,094 89,043 44,071 193,394 Pretax income (loss) $ 102,214 $ 22,683 $ 42,938 $ (43,289 ) $ 124,546 Total assets at year end $ 1,791,447 $ 2,414,423 $ 1,302,245 $ 96,818 $ 5,604,933

Selected Quarterly Results (Tab

Selected Quarterly Results (Tables)	12 Months Ended
	Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]
Selected Quarterly Financial Data	Following is a presentation of selected quarterly financial data: Quarter ended 2019 2018 Dec. 31 Sept. 30 June 30 Mar. 31 Dec. 31 Sept. 30 June 30 Mar. 31 (dollars in thousands, except per share data) Net investment income $ 155,036 $ 130,760 $ 96,401 $ 106,618 $ 83,902 $ 108,501 $ 82,991 $ 75,673 Net income $ 58,597 $ 70,000 $ 44,233 $ 53,527 $ 41,625 $ 46,562 $ 36,425 $ 28,186 Earnings per share: Basic $ 0.56 $ 0.75 $ 0.52 $ 0.73 $ 0.58 $ 0.66 $ 0.49 $ 0.36 Diluted $ 0.55 $ 0.71 $ 0.50 $ 0.68 $ 0.55 $ 0.62 $ 0.47 $ 0.35 Cash dividends declared per share $ 0.47 $ 0.47 $ 0.47 $ 0.47 $ 0.47 $ 0.47 $ 0.47 $ 0.47 At quarter end: Mortgage-backed securities $ 2,839,633 $ 2,325,010 $ 2,600,357 $ 2,589,106 $ 2,610,422 $ 2,126,507 $ 1,698,322 $ 1,436,456 Loans (1) 4,419,218 4,237,895 2,835,837 1,833,735 2,052,262 2,582,600 2,539,963 1,895,023 Excess servicing spread 178,586 183,141 194,156 205,081 216,110 223,275 229,470 236,002 Derivative assets 202,318 274,444 258,782 188,710 167,165 143,577 133,239 122,518 Real estate (2) 65,583 79,201 97,808 114,521 128,791 141,576 155,702 187,296 Deposits securing credit risk transfer arrangements 1,969,784 2,044,250 2,060,612 1,137,283 1,146,501 662,624 651,204 622,330 Mortgage servicing rights 1,535,705 1,162,714 1,126,427 1,156,908 1,162,369 1,109,741 1,010,507 957,013 Other assets 560,524 437,954 291,810 330,643 329,741 277,678 258,442 333,848 Total assets $ 11,771,351 $ 10,744,609 $ 9,465,789 $ 7,555,987 $ 7,813,361 $ 7,267,578 $ 6,676,849 $ 5,790,486 Short-term debt $ 7,005,986 $ 6,713,154 $ 5,483,267 $ 4,378,900 $ 5,081,691 $ 4,452,670 $ 3,630,843 $ 3,366,181 Long-term debt 2,159,286 1,646,349 1,915,465 1,295,949 1,011,433 1,086,841 1,363,886 737,289 Other liabilities 155,164 165,495 123,123 153,549 154,105 169,504 136,633 144,758 Total liabilities 9,320,436 8,524,998 7,521,855 5,828,398 6,247,229 5,709,015 5,131,362 4,248,228 Shareholders’ equity 2,450,915 2,219,611 1,943,934 1,727,589 1,566,132 1,558,563 1,545,487 1,542,258 Total liabilities and shareholders’ equity $ 11,771,351 $ 10,744,609 $ 9,465,789 $ 7,555,987 $ 7,813,361 $ 7,267,578 $ 6,676,849 $ 5,790,486 (1) Includes loans acquired for sale at fair value and loans at fair value. (2) Includes REO and real estate held for investment.

Supplemental Cash Flow Inform_2

Supplemental Cash Flow Information (Tables)	12 Months Ended
	Dec. 31, 2019
Supplemental Cash Flow Elements [Abstract]
Summary of Supplemental Cash Flow Information	Year ended December 31, 2019 2018 2017 (in thousands) Payments: Income tax, net $ (1,009 ) $ 1,333 $ (2,354 ) Interest $ 298,591 $ 170,435 $ 152,441 Cumulative effect on accumulated deficit of conversion to fair value accounting for mortgage servicing rights $ — $ (14,361 ) $ — Non-cash investing activities: Transfer of loans and advances to real estate acquired in settlement of loans $ 23,672 $ 32,578 $ 87,202 Transfer of real estate acquired in settlement of mortgage loans to real estate held for investment $ — $ 5,183 $ 16,530 Transfer from real estate held for investment to real estate acquired in settlement of loans $ 30,432 $ 3,401 $ — Receipt of mortgage servicing rights as proceeds from sales of loans at fair value $ 837,706 $ 356,755 $ 290,309 Receipt of excess servicing spread pursuant to recapture agreement with PennyMac Financial Services, Inc. $ 1,757 $ 2,688 $ 5,244 Capitalization of servicing advances pursuant to mortgage loan modifications $ 1,340 $ 5,481 $ 18,923 Transfer of firm commitment to purchase CRT securities to CRT strips $ 56,804 $ — $ — Non-cash financing activities: Dividends declared, not paid $ 47,193 $ 28,816 $ 29,145

Regulatory Capital and Liquid_2

Regulatory Capital and Liquidity Requirements (Tables)	12 Months Ended
	Dec. 31, 2019
Mortgage Banking [Abstract]
Summary of Capital and Liquidity Amounts and Requirements by Agencies	The Agencies’ capital and liquidity amounts and requirements, the calculations of which are defined by each entity, 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) December 31, 2019 $ 627,144 $ 341,009 8 % 6 % $ 128,806 $ 44,970 December 31, 2018 $ 528,506 $ 238,915 11 % 6 % $ 58,144 $ 31,678 (1) Calculated in accordance with the Agencies’ requirements.

Parent Company Information (Tab

Parent Company Information (Tables)	12 Months Ended
	Dec. 31, 2019
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]
Schedule of Financial Covenants that Include Minimum Tangible Net Worth	The Company’s debt financing agreements require PMT and certain of its subsidiaries to comply with financial covenants that include a minimum tangible net worth as summarized below: December 31, 2019 Company consolidated Debt covenant requirement Calculated balance (1) (in thousands) PennyMac Mortgage Investment Trust $ 860,000 $ 2,450,915 Operating Partnership $ 860,000 $ 2,490,553 PennyMac Holdings $ 250,000 $ 730,914 PennyMac Corp $ 150,000 $ 627,004 (1) Calculated in accordance with the lenders’ requirements.
Schedule of Parent Company Information	PENNYMAC MORTGAGE INVESTMENT TRUST CONDENSED BALANCE SHEETS Following are condensed parent-only financial statements for the Company: December 31, 2019 2018 (in thousands) Assets Short-term investment $ 2,819 $ 714 Investments in subsidiaries 2,501,015 1,599,298 Due from subsidiaries 469 86 Other assets 595 647 Total assets $ 2,504,898 $ 1,600,745 Liabilities Dividends payable $ 47,193 $ 28,680 Accounts payable and accrued liabilities 1,564 2,338 Due to affiliates 399 888 Due to subsidiaries 1 27 Total liabilities 49,157 31,933 Shareholders' equity 2,455,741 1,568,812 Total liabilities and shareholders' equity $ 2,504,898 $ 1,600,745 PENNYMAC MORTGAGE INVESTMENT TRUST CONDENSED STATEMENTS OF INCOME Year ended December 31, 2019 2018 2017 (in thousands) Income Dividends from subsidiaries $ 165,451 $ 221,469 $ 177,571 Intercompany interest 34 8 7 Other 2,389 1,250 1,256 Total income 167,874 222,727 178,834 Expenses Intercompany interest 27 414 378 Other 3 — — Total expenses 30 414 378 Income before provision for income taxes and equity in undistributed earnings in subsidiaries 167,844 222,313 178,456 (Benefit from) provision for income taxes (109 ) 24 308 Income before equity in undistributed earnings of subsidiaries 167,953 222,289 178,148 Equity in undistributed earnings (distributions in excess of earnings) of subsidiaries 60,937 (71,180 ) (60,655 ) Net income $ 228,890 $ 151,109 $ 117,493 PENNYMAC MORTGAGE INVESTMENT TRUST CONDENSED STATEMENTS OF CASH FLOWS Year ended December 31, 2019 2018 2017 (in thousands) Cash flows from operating activities: Net income $ 228,890 $ 151,109 $ 117,493 (Distributions in excess of earnings, not yet distributed) Equity in undistributed earnings of subsidiaries (60,937 ) 71,180 60,655 Decrease in due from affiliates 261 490 620 Decrease (increase) in other assets 52 (58 ) 21 (Decrease) increase in accounts payable and accrued liabilities (697 ) (3,320 ) 2,892 Increase in due from affiliates (489 ) (185 ) (58 ) Increase in due to affiliates 33 84 35 Net cash provided by operating activities 167,113 219,300 181,658 Cash flows from investing activities: Increase in investment in subsidiaries (825,920 ) — (299,919 ) Net (increase) decrease in short-term investments (2,105 ) 1,159 (838 ) Net cash (used in) provided by investing activities (828,025 ) 1,159 (300,757 ) Cash flows from financing activities: Net (decrease) increase in intercompany unsecured note payable — (69,200 ) 50,791 Proceeds from issuance of common shares 839,682 — — Payment of issuance costs related to common shares (10,225 ) — — Payment of withholding taxes related to share-based compensation (2,600 ) — — Payment of dividends to preferred shareholders (24,944 ) (24,944 ) (14,066 ) Payment of dividends to common shareholders (141,001 ) (115,596 ) (126,135 ) Repurchases of common shares — (10,719 ) (91,198 ) Issuance of preferred shares — — 310,000 Payment of issuance costs related to preferred shares — — (10,293 ) Net cash provided by (used in) financing activities 660,912 (220,459 ) 119,099 Net change in cash — — — Cash at beginning of year — — — Cash at end of year $ — $ — $ — Non-cash investing activities: Investment in subsidiary pursuant to share based compensation plan $ 5,529 $ 5,314 $ 4,902 Non-cash financing activities: Investment in subsidiary pursuant to share based compensation plan $ 5,529 $ 5,314 $ 4,902 Dividends payable $ 47,193 $ 28,816 $ 31,655

Organization - Additional Infor

Organization - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2019Segment
Accounting Policies [Abstract]
Number of business segments	4
Percentage of taxable income for distributions	90.00%

Significant Accounting Polici_3

Significant Accounting Policies - Additional Information (Detail) - USD ($)	Sep. 30, 2013	Dec. 31, 2019
Mortgage Loans on Real Estate [Line Items]
Cost-basis investments		$ 0
Equity method investments		$ 0
Loan delinquent period		90 days
Deciding percentage of class of MSRs		more than 4.5%.
Interest rate		4.50%
MSRs note rate pool description		note interest rate pools of 50 basis points for note interest rates between 3.0% and 4.5% and a single pool for note interest rates below 3%. Adjustable rate loans with initial interest rates of 4.5% or less were evaluated in a single pool.
Mortgage loans description		note interest rate pools of 50 basis points
Basis point for mortgage loan		0.50%
Income tax positions likely to be recognized		50.00%
Minimum [Member]
Mortgage Loans on Real Estate [Line Items]
Fixed-rate mortgage loans		3.00%
Maximum [Member]
Mortgage Loans on Real Estate [Line Items]
Fixed-rate mortgage loans		4.50%
Mortgage servicing rights [Member]
Mortgage Loans on Real Estate [Line Items]
Deciding percentage of class of MSRs		The Company identified two classes of MSRs: originated MSRs backed by loans with initial interest rates of less than or equal to 4.5%; and originated MSRs backed by loans with initial interest rates of more than 4.5%.
Jumbo Mortgage Loan Financing [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]
Mortgage Loans on Real Estate [Line Items]
Certificates issued	$ 537,000,000
Weighted cost	3.90%

Transactions with Related Par_3

Transactions with Related Parties - Correspondent Production Activities - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
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	Sep. 12, 2020
Renewal period of servicing agreement	18 months
PennyMac Loan Services, LLC [Member] | Fannie Mae Or Freddie Mac Mortgage Loans | 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%
Mortgage banking services [Member]
Mortgage Loans On Real Estate [Line Items]
Mortgage loan fees per annum	$ 1,500
Mortgage loan fees per loan	$ 35
Servicing agreement expiration date	Sep. 12, 2020
Renewal period of servicing agreement	18 months
Warehouse services [Member]
Mortgage Loans On Real Estate [Line Items]
Servicing agreement expiration date	Sep. 12, 2020
Renewal period of servicing agreement	18 months

Transactions with Related Par_4

Transactions with Related Parties - Summary of Correspondent Production Activity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Loan fulfillment fees earned by PLS	$ 160,610	$ 81,350	$ 80,359
Purchases of loans acquired for sale from PLS	6,255,915	3,343,028	904,097
Loans included in Loans acquired for sale at fair value pending sale to PLS	4,148,425	1,643,957
PennyMac Loan Services, LLC [Member]
Related Party Transaction [Line Items]
Loan fulfillment fees earned by PLS	160,610	81,350	80,359
UPB of loans fulfilled by PLS	56,033,704	26,194,303	22,971,119
Sourcing fees received from PLS included in Net gain on loans acquired for sale	14,381	10,925	12,084
UPB of loans sold to PLS	47,937,306	36,415,933	40,561,241
Purchases of loans acquired for sale from PLS	6,255,915	3,343,028	904,097
Tax service fees paid to PLS	14,697	7,433	$ 7,078
Loans included in Loans acquired for sale at fair value pending sale to PLS	$ 490,383	$ 86,308

Transactions with Related Par_5

Transactions with Related Parties - Mortgage Loan Servicing - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2019USD ($)
PennyMac Loan Services, LLC [Member]
Mortgage Loans On Real Estate [Line Items]
REO rental fee	$ 30
Lease renewal fee for REO	$ 100
Rental income percentage gross	9.00%
Servicing agreement expiration date	Sep. 12, 2020
Renewal period of servicing agreement	18 months
PennyMac Loan Services, LLC [Member] | Distressed loans [Member]
Mortgage Loans On Real Estate [Line Items]
Base servicing fees for REO per month	$ 75
Supplemental fee received per month	25
Activity based fees	$ 500
Services agreement fees collection period	18 months
PennyMac Loan Services, LLC [Member] | Distressed loans [Member] | Minimum [Member]
Mortgage Loans On Real Estate [Line Items]
Base servicing fees per month	$ 30
Activity based fees	750
PennyMac Loan Services, LLC [Member] | Distressed loans [Member] | Maximum [Member]
Mortgage Loans On Real Estate [Line Items]
Base servicing fees per month	85
Activity based fees	1,750
PennyMac Loan Services, LLC [Member] | Subserviced loan [Member] | Fixed-Rate Mortgage Loans [Member]
Mortgage Loans On Real Estate [Line Items]
Base servicing fees per month	7.50
PennyMac Loan Services, LLC [Member] | Subserviced loan [Member] | Adjustable rate mortgage loans [Member]
Mortgage Loans On Real Estate [Line Items]
Base servicing fees per month	8.50
PennyMac Loan Services, LLC [Member] | Non-Distressed Mortgage Loans [Member]
Mortgage Loans On Real Estate [Line Items]
Base servicing fees for REO per month	75
PennyMac Loan Services, LLC [Member] | Non-Distressed Mortgage Loans [Member] | Minimum [Member]
Mortgage Loans On Real Estate [Line Items]
Additional servicing fees per loan per month	10
PennyMac Loan Services, LLC [Member] | Non-Distressed Mortgage Loans [Member] | Maximum [Member]
Mortgage Loans On Real Estate [Line Items]
Additional servicing fees per loan per month	$ 55
PennyMac Financial Services, Inc. [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%

Transactions with Related Par_6

Transactions with Related Parties - Summary of Loan Servicing Fees Earned and Mortgage Servicing Rights Recaptured Income Earned (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Loan servicing fees	$ 48,797	$ 42,045	$ 43,064
Average MSR portfolio UPB	110,075,179	80,500,212	63,836,843
PennyMac Loan Services, LLC [Member]
Related Party Transaction [Line Items]
Loan servicing fees	48,797	42,045	43,064
Average MSR portfolio UPB	110,075,179	80,500,212	63,836,843
MSR recapture income recognized included in Net loan servicing fees —from PennyMac Financial Services, Inc.	5,324	2,192	1,428
PennyMac Loan Services, LLC [Member] | Loans acquired for sale at fair value [Member]
Related Party Transaction [Line Items]
Loan servicing fees	1,772	1,037	954
Average MSR portfolio UPB	2,754,955	1,577,395	1,366,017
PennyMac Loan Services, LLC [Member] | Loans at fair value [Member]
Related Party Transaction [Line Items]
Loan servicing fees	2,207	7,555	15,610
PennyMac Loan Services, LLC [Member] | Distressed [Member]
Related Party Transaction [Line Items]
Average MSR portfolio UPB	75,251	473,458	1,152,930
PennyMac Loan Services, LLC [Member] | Held in a VIE [Member]
Related Party Transaction [Line Items]
Average MSR portfolio UPB	281,449	301,398	344,942
PennyMac Loan Services, LLC [Member] | Mortgage servicing rights [Member]
Related Party Transaction [Line Items]
Loan servicing fees	$ 44,818	$ 33,453	$ 26,500

Transactions with Related Par_7

Transactions with Related Parties - Management Fees - Additional Information (Detail) - USD ($)	Feb. 01, 2019	Dec. 31, 2019	Aug. 04, 2009
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 immediately preceding the date of 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%
Servicing agreement expiration date	Feb. 1, 2023	Sep. 12, 2020
Services agreement fees collection period		18 months
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
PMT agreed to reimburse PCM for a payment		$ 120,000
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%
PMT agreed to reimburse PCM for a payment			$ 2,900,000
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 Par_8

Transactions with Related Parties - Summary of Management Fee Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Total management fee incurred during the period	$ 36,492	$ 24,465	$ 22,584
PNMAC Capital Management LLC [Member]
Related Party Transaction [Line Items]
Total management fee incurred during the period	36,492	24,465	22,584
Average shareholders' equity amounts used to calculate management fee expense	1,958,970	1,535,590	1,484,446
PNMAC Capital Management LLC [Member] | Base [Member]
Related Party Transaction [Line Items]
Total management fee incurred during the period	29,303	23,033	22,280
PNMAC Capital Management LLC [Member] | Performance incentive [Member]
Related Party Transaction [Line Items]
Total management fee incurred during the period	$ 7,189	$ 1,432	$ 304

Transactions with Related Par_9

Transactions with Related Parties - Summary of Expenses (Detail) - PNMAC Capital Management LLC [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Common overhead incurred by PCM and its affiliates	$ 5,340	$ 4,640	$ 5,306
Compensation	480	480	0
Expenses incurred on the Company’s behalf, net	4,362	1,113	2,257
Total expenses incurred in transaction with affiliates	10,182	6,233	7,563
Payments and settlements during the year	$ 177,116	$ 71,943	$ 64,945

Transactions with Related Pa_10

Transactions with Related Parties - Note Payable to PLS - Additional Information (Detail) - USD ($)	Feb. 01, 2019	Dec. 19, 2016	Dec. 31, 2019	Dec. 31, 2018	Aug. 04, 2009
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
PNMAC Capital Management LLC [Member]
Related Party Transaction [Line Items]
PMT agreed to reimburse PCM for a payment			$ 120,000
Servicing agreement expiration date	Feb. 1, 2023		Sep. 12, 2020
Maximum [Member]
Related Party Transaction [Line Items]
Aggregate ESS transferred		$ 200,000
Maximum [Member] | PNMAC Capital Management LLC [Member]
Related Party Transaction [Line Items]
PMT agreed to reimburse PCM for a payment					$ 2,900,000

Transactions with Related Pa_11

Transactions with Related Parties - Summary of Investing Activity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
ESS:
Interest income	$ 317,885	$ 222,772	$ 195,176
Net (loss) gain included in Net gain (loss) on investments:
Net (loss) gain on investments	263,318	81,926	96,384
Excess servicing spread purchased from PennyMac Financial Services, Inc. at fair value	178,586	216,110		$ 183,141	$ 194,156	$ 205,081	$ 223,275	$ 229,470	$ 236,002
PennyMac Financial Services, Inc. [Member]
ESS:
Received pursuant to a recapture agreement	1,757	2,688	5,244
Repayments and sales	40,316	46,750	54,980
Interest income	10,291	15,138	16,951
Net (loss) gain included in Net gain (loss) on investments:
Valuation changes	(9,256)	8,500	(19,350)
Recapture income	1,726	2,584	4,820
Net (loss) gain on investments	(7,530)	11,084	$ (14,530)
Excess servicing spread purchased from PennyMac Financial Services, Inc. at fair value	$ 178,586	$ 216,110

Transactions with Related Pa_12

Transactions with Related Parties - Summary of Financing Activities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Interest expense	$ 297,446	$ 175,171	$ 151,371
PennyMac Financial Services, Inc. [Member]
Related Party Transaction [Line Items]
Net repayments of assets sold under agreements to repurchase	23,513	13,103	5,872
Interest expense	6,302	7,462	8,038
Assets sold to PFSI under agreement to repurchase	107,512	131,025
Conditional Reimbursement payable to PCM included in Due to PennyMac Financial Services, Inc.	221	801
PNMAC Capital Management LLC [Member]
Related Party Transaction [Line Items]
Payment of conditional reimbursement to PCM	$ 580	$ 69	$ 30

Transactions with Related Pa_13

Transactions with Related Parties - Summary of Amounts Receivable From and Payable to PFSI (Detail) - PennyMac Financial Services, Inc. [Member] - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Due from PFSI:
MSR recapture	$ 149	$ 179
Other	2,611	3,898
Due from Affiliates	2,760	4,077
Due to PFSI:
Fulfillment fees	18,285	10,006
Correspondent production fees	10,606	2,071
Management fees	10,579	6,559
Loan servicing fees	4,659	4,841
Allocated expenses and expenses paid by PFSI on PMT’s behalf	3,724	9,066
Conditional Reimbursement	221	801
Interest on Assets sold to PFSI under agreement to repurchase	85	120
Total expense due to affiliate	$ 48,159	$ 33,464

Transactions with Related Pa_14

Transactions with Related Parties - Summary of Transfer Cash to Fund Loan Servicing Advances (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Loan servicing advances	$ 48,971	$ 67,666
Real estate acquired in settlement of loans	65,583	85,681	$ 162,865	$ 274,069
PennyMac Loan Services, LLC [Member]
Related Party Transaction [Line Items]
Loan servicing advances	48,971	67,666
Real estate acquired in settlement of loans	21,549	32,888
Servicing advances and real estate acquired	$ 70,520	$ 100,554

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	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows:
Loan servicing fees received net of guarantee fees	$ 295,390	$ 204,663	$ 164,776
Variable Interest Entity, Not Primary Beneficiary, Aggregated Disclosure [Member]
Cash flows:
Proceeds from sales	61,128,081	29,369,656	24,314,165
Loan servicing fees received net of guarantee fees	$ 295,390	$ 204,663	$ 164,776

Loan Sales - Summary of Collect

Loan Sales - Summary of Collection Status Information for Loans Accounted for Sales (Detail) - Variable Interest Entity, Not Primary Beneficiary, Aggregated Disclosure [Member] - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Mortgage Loans On Real Estate [Line Items]
UPB of loans outstanding	$ 130,663,117	$ 91,982,335
Collection Status (UPB)
30-89 days delinquent	1,014,094	614,668
90 or more days delinquent:
Not in foreclosure	258,036	142,871
In foreclosure	53,697	40,445
Bankruptcy	130,936	75,947
Custodial funds managed by the Company	$ 2,529,984	$ 970,328

Variable Interest Entities - Ad

Variable Interest Entities - Additional Information (Detail) - USD ($) $ in Millions	Sep. 30, 2013	Dec. 31, 2019
Jumbo Mortgage Loan Financing [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [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	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
CRT derivatives
Interest income	$ 317,885	$ 222,772	$ 195,176
Carrying value of CRT arrangements:
CRT strips	54,930	0
Derivative and credit risk transfer strip assets	202,318	167,165		$ 274,444	$ 258,782	$ 188,710	$ 143,577	$ 133,239	$ 122,518
Deposits securing credit risk transfer arrangements	1,969,784	1,146,501
Interest-only security payable at fair value	25,709	36,011
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] | Credit Risk Transfer Agreements [Member]
Transfer Of Financial Assets Accounted For As Sales [Line Items]
UPB of loans sold	47,748,300	21,939,277	14,529,548
Investments:
Deposits securing CRT arrangements	933,370	596,626	152,641
Change in expected face amount of firm commitment to purchase CRT securities and commitments to fund Deposits securing CRT arrangements resulting from sales of loans	897,151	122,581	390,362
Deposits of cash securing credit risk transfer agreements net of adjustment	1,830,521	719,207	543,003
CRT strips
Realized	32,200
Valuation changes	(1,874)
Credit risk transfer strips	30,326
CRT derivatives
Realized	79,619	86,928	51,731
Valuation changes	(9,571)	25,347	83,030
Gains (losses) recognized on gross derivative related to credit risk transactions	70,048	112,275	134,761
Interest-only security payable at fair value	10,302	(19,332)	(11,033)
Gains (losses) recognized on gross derivative related to credit risk transactions	110,676	92,943	123,728
Firm commitments to purchase CRT securities	60,943	7,399	0
Gains (losses) recognized on CRT agreements upon firm commitments to purchase CRT securities	171,619	100,342	123,728
Net gain on loans acquired for sale - Fair value of firm commitment to purchase CRT securities recognized upon sale of loans	99,305	30,595	0
Interest income - Deposits securing CRT arrangements	34,229	15,441	4,291
Interest income	305,153	146,378	128,019
Payments made to settle losses on credit risk transfer arrangements	5,165	2,133	$ 1,396
Carrying value of CRT arrangements:
CRT strips	54,930	0
CRT derivatives	115,863	123,987
Derivative and credit risk transfer strip assets	170,793	123,987
Firm commitment to purchase credit risk transfer securities at fair value	109,513	37,994
Deposits securing credit risk transfer arrangements	1,969,784	1,146,501
Interest-only security payable at fair value	25,709	36,011
Derivative and credit risk transfer strip assets	142,183	87,976
Derivative and credit risk transfer strip assets pledged to secure	1,969,784	1,146,501
Face amount of firm commitment to purchase CRT securities	1,502,203	605,052
UPB of loans - funded credit risk transfer arrangements	41,944,117	29,934,003
Collection status (UPB):
Current	41,355,622	29,633,133
30—89 days delinquent	463,331	228,296
90—180 days delinquent	106,234	39,826
180 or more days delinquent	8,802	4,208
Foreclosure	10,128	5,180
Bankruptcy	55,452	23,360
UPB of loans - firm commitment to purchase CRT securities	38,738,396	16,392,300
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] | Credit Risk Transfer Agreements [Member] | Purchase Commitment [Member]
Collection status (UPB):
Current	38,581,080	16,329,044
30—89 days delinquent	146,256	61,035
90—180 days delinquent	9,109	2,221
180 or more days delinquent	0	0
Foreclosure	1,951	0
Bankruptcy	$ 2,980	$ 1,258

Variable Interest Entities - _2

Variable Interest Entities - Summary of Jumbo Mortgage Loan Financing (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Mortgage Loans on Real Estate [Line Items]
Interest income	$ 317,885	$ 222,772	$ 195,176
Interest expense	297,446	175,171	151,371
Loans at fair value	270,793	408,305
Asset-backed financing of a variable interest entity at fair value	243,360	276,499
Jumbo Mortgage Loan Financing [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]
Mortgage Loans on Real Estate [Line Items]
Interest income	11,734	11,813	14,425
Interest expense	11,324	10,821	$ 13,184
Loans at fair value	256,367	290,573
Asset-backed financing of a variable interest entity at fair value	243,360	276,499
Certificates retained at fair value	$ 13,007	$ 14,074

Fair Value - Summary of Financi

Fair Value - Summary of Financial Statement Items Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Assets:
Short-term investments	$ 90,836				$ 74,850
Mortgage-backed securities at fair value pledged to creditors	2,839,633	$ 2,325,010	$ 2,600,357	$ 2,589,106	2,610,422	$ 2,126,507	$ 1,698,322	$ 1,436,456
Loans acquired for sale at fair value	4,148,425				1,643,957
Excess servicing spread purchased from PFSI	178,586	$ 183,141	$ 194,156	$ 205,081	216,110	$ 223,275	$ 229,470	$ 236,002
Derivative and credit risk transfer strip assets:
Derivative assets	153,666				171,996
Derivative assets, Netting	(6,278)				(4,831)
Total derivative and credit risk transfer strip assets after netting	147,388				167,165
Firm commitment to purchase credit risk transfer securities at fair value	109,513				37,994
Mortgage servicing rights at fair value	1,535,705				1,162,369				$ 91,459	$ 64,136
Liabilities:
Asset-backed financing of a VIE at fair value	243,360				276,499
Interest-only security payable at fair value	25,709				36,011
Derivative liabilities:
Derivative liabilities	19,816				29,490
Derivative liabilities, Netting	(13,393)				(23,576)
Total derivative liabilities after netting	6,423				5,914
CRT Derivatives [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	115,863				123,987
Derivative assets, Netting	0				0
Total derivative and credit risk transfer strip assets after netting	115,863				123,987
Derivative liabilities:
Derivative liabilities	0				0
Interest Rate Lock Commitments [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	11,726				12,162
Total derivative and credit risk transfer strip assets after netting	11,726				12,162
Derivative liabilities:
Derivative liabilities	572				174
Forward Purchase Contracts [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	7,525				14,845
Derivative assets, Netting	0				0
Total derivative and credit risk transfer strip assets after netting	7,525				14,845
Derivative liabilities:
Derivative liabilities	3,600				43
Derivative liabilities, Netting	0				0
Forward Sales Contracts [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	637				13
Derivative assets, Netting	0				0
Total derivative and credit risk transfer strip assets after netting	637				13
Derivative liabilities:
Derivative liabilities	15,644				29,273
Derivative liabilities, Netting	0				0
Swaptions [Member]
Derivative liabilities:
Derivative liabilities	0				0
MBS Put Options [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	1,625				218
Derivative assets, Netting	0				0
Total derivative and credit risk transfer strip assets after netting	1,625				218
Derivative liabilities:
Derivative liabilities	0				0
Put Options on Interest Rate Futures [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	2,859				178
Derivative assets, Netting	0				0
Total derivative and credit risk transfer strip assets after netting	2,859				178
Derivative liabilities:
Derivative liabilities	0				0
Swap Futures [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	4,347				0
Derivative assets, Netting	0				0
Total derivative and credit risk transfer strip assets after netting	4,347				0
Derivative liabilities:
Derivative liabilities	0				0
Call Options on Interest Rate Futures [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	3,809				5,137
Derivative assets, Netting	0				0
Total derivative and credit risk transfer strip assets after netting	3,809				5,137
Derivative liabilities:
Derivative liabilities	0				0
MBS Call Options [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	0				945
Derivative assets, Netting	0				0
Total derivative and credit risk transfer strip assets after netting	0				945
Derivative liabilities:
Derivative liabilities	0				0
Repurchase Agreement Derivatives [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	5,275				14,511
Derivative assets, Netting	0				0
Total derivative and credit risk transfer strip assets after netting	5,275				14,511
Derivative liabilities:
Derivative liabilities	0				0
Recurring [Member]
Assets:
Short-term investments	90,836				74,850
Mortgage-backed securities at fair value pledged to creditors	2,839,633				2,610,422
Loans acquired for sale at fair value	4,148,425				1,643,957
Loans at fair value	270,793				408,305
Excess servicing spread purchased from PFSI	178,586				216,110
Derivative and credit risk transfer strip assets:
Derivative assets	208,596				171,996
Derivative assets, Netting	(6,278)				(4,831)
Total derivative and credit risk transfer strip assets after netting	202,318				167,165
Firm commitment to purchase credit risk transfer securities at fair value	109,513				37,994
Mortgage servicing rights at fair value	1,535,705				1,162,369
Total Assets	9,375,809				6,321,172
Liabilities:
Asset-backed financing of a VIE at fair value	243,360				276,499
Interest-only security payable at fair value	25,709				36,011
Derivative liabilities:
Derivative liabilities	19,816				29,490
Derivative liabilities, Netting	(13,393)				(23,576)
Total derivative liabilities after netting	6,423				5,914
Total liabilities	275,492				318,424
Recurring [Member] | Credit Risk Transfer Strips [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	54,930
Recurring [Member] | CRT Derivatives [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	115,863				123,987
Recurring [Member] | Interest Rate Lock Commitments [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	11,726				12,162
Derivative liabilities:
Derivative liabilities	572				174
Recurring [Member] | Forward Purchase Contracts [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	7,525				14,845
Derivative liabilities:
Derivative liabilities	3,600				43
Recurring [Member] | Forward Sales Contracts [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	637				13
Derivative liabilities:
Derivative liabilities	15,644				29,273
Recurring [Member] | Swaptions [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	0
Recurring [Member] | Level 1 [Member]
Assets:
Short-term investments	90,836				74,850
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
Excess servicing spread purchased from PFSI	0				0
Derivative and credit risk transfer strip assets:
Derivative assets	6,668				5,315
Derivative assets, Netting	0				0
Total derivative and credit risk transfer strip assets after netting	6,668				5,315
Firm commitment to purchase credit risk transfer securities at fair value	0				0
Mortgage servicing rights at fair value	0				0
Total Assets	97,504				80,165
Liabilities:
Asset-backed financing of a VIE at fair value	0				0
Interest-only security payable at fair value	0				0
Derivative liabilities:
Derivative liabilities	0				0
Derivative liabilities, Netting	0				0
Total derivative liabilities after netting	0				0
Total liabilities	0				0
Recurring [Member] | Level 1 [Member] | Credit Risk Transfer Strips [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	0
Recurring [Member] | Level 1 [Member] | CRT Derivatives [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	0				0
Recurring [Member] | Level 1 [Member] | Interest Rate Lock Commitments [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	0				0
Derivative liabilities:
Derivative liabilities	0				0
Recurring [Member] | Level 1 [Member] | Forward Purchase Contracts [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	0				0
Derivative liabilities:
Derivative liabilities	0				0
Recurring [Member] | Level 1 [Member] | Forward Sales Contracts [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	0				0
Derivative liabilities:
Derivative liabilities	0				0
Recurring [Member] | Level 1 [Member] | Swaptions [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	0
Recurring [Member] | Level 2 [Member]
Assets:
Short-term investments	0				0
Mortgage-backed securities at fair value pledged to creditors	2,839,633				2,610,422
Loans acquired for sale at fair value	4,129,858				1,626,483
Loans at fair value	256,367				290,573
Excess servicing spread purchased from PFSI	0				0
Derivative and credit risk transfer strip assets:
Derivative assets	14,134				16,021
Derivative assets, Netting	0				0
Total derivative and credit risk transfer strip assets after netting	14,134				16,021
Firm commitment to purchase credit risk transfer securities at fair value	0				0
Mortgage servicing rights at fair value	0				0
Total Assets	7,239,992				4,543,499
Liabilities:
Asset-backed financing of a VIE at fair value	243,360				276,499
Interest-only security payable at fair value	0				0
Derivative liabilities:
Derivative liabilities	19,244				29,316
Derivative liabilities, Netting	0				0
Total derivative liabilities after netting	19,244				29,316
Total liabilities	262,604				305,815
Recurring [Member] | Level 2 [Member] | Credit Risk Transfer Strips [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	0
Recurring [Member] | Level 2 [Member] | CRT Derivatives [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	0				0
Recurring [Member] | Level 2 [Member] | Interest Rate Lock Commitments [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	0				0
Derivative liabilities:
Derivative liabilities	0				0
Recurring [Member] | Level 2 [Member] | Forward Purchase Contracts [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	7,525				14,845
Derivative liabilities:
Derivative liabilities	3,600				43
Recurring [Member] | Level 2 [Member] | Forward Sales Contracts [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	637				13
Derivative liabilities:
Derivative liabilities	15,644				29,273
Recurring [Member] | Level 2 [Member] | Swaptions [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	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	18,567				17,474
Loans at fair value	14,426				117,732
Excess servicing spread purchased from PFSI	178,586				216,110
Derivative and credit risk transfer strip assets:
Derivative assets	187,794				150,660
Derivative assets, Netting	0				0
Total derivative and credit risk transfer strip assets after netting	187,794				150,660
Firm commitment to purchase credit risk transfer securities at fair value	109,513				37,994
Mortgage servicing rights at fair value	1,535,705				1,162,369
Total Assets	2,044,591				1,702,339
Liabilities:
Asset-backed financing of a VIE at fair value	0				0
Interest-only security payable at fair value	25,709				36,011
Derivative liabilities:
Derivative liabilities	572				174
Derivative liabilities, Netting	0				0
Total derivative liabilities after netting	572				174
Total liabilities	26,281				36,185
Recurring [Member] | Level 3 [Member] | Credit Risk Transfer Strips [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	54,930
Recurring [Member] | Level 3 [Member] | CRT Derivatives [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	115,863				123,987
Recurring [Member] | Level 3 [Member] | Interest Rate Lock Commitments [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	11,726				12,162
Derivative liabilities:
Derivative liabilities	572				174
Recurring [Member] | Level 3 [Member] | Forward Purchase Contracts [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	0				0
Derivative liabilities:
Derivative liabilities	0				0
Recurring [Member] | Level 3 [Member] | Forward Sales Contracts [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	0				0
Derivative liabilities:
Derivative liabilities	0				0
Recurring [Member] | Level 3 [Member] | Swaptions [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	0
Recurring [Member] | MBS Put Options [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	1,625				218
Recurring [Member] | MBS Put Options [Member] | Level 1 [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	0				0
Recurring [Member] | MBS Put Options [Member] | Level 2 [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	1,625				218
Recurring [Member] | MBS Put Options [Member] | Level 3 [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	0				0
Recurring [Member] | Put Options on Interest Rate Futures [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	2,859				178
Recurring [Member] | Put Options on Interest Rate Futures [Member] | Level 1 [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	2,859				178
Recurring [Member] | Put Options on Interest Rate Futures [Member] | Level 2 [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	0				0
Recurring [Member] | Put Options on Interest Rate Futures [Member] | Level 3 [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	0				0
Recurring [Member] | Swap Futures [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	4,347
Recurring [Member] | Swap Futures [Member] | Level 1 [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	0
Recurring [Member] | Swap Futures [Member] | Level 2 [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	4,347
Recurring [Member] | Swap Futures [Member] | Level 3 [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	0
Recurring [Member] | Call Options on Interest Rate Futures [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	3,809				5,137
Recurring [Member] | Call Options on Interest Rate Futures [Member] | Level 1 [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	3,809				5,137
Recurring [Member] | Call Options on Interest Rate Futures [Member] | Level 2 [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	0				0
Recurring [Member] | Call Options on Interest Rate Futures [Member] | Level 3 [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	0				0
Recurring [Member] | MBS Call Options [Member]
Derivative and credit risk transfer strip assets:
Derivative assets					945
Recurring [Member] | MBS Call Options [Member] | Level 1 [Member]
Derivative and credit risk transfer strip assets:
Derivative assets					0
Recurring [Member] | MBS Call Options [Member] | Level 2 [Member]
Derivative and credit risk transfer strip assets:
Derivative assets					945
Recurring [Member] | MBS Call Options [Member] | Level 3 [Member]
Derivative and credit risk transfer strip assets:
Derivative assets					0
Recurring [Member] | Repurchase Agreement Derivatives [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	5,275				14,511
Recurring [Member] | Repurchase Agreement Derivatives [Member] | Level 1 [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	0				0
Recurring [Member] | Repurchase Agreement Derivatives [Member] | Level 2 [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	0				0
Recurring [Member] | Repurchase Agreement Derivatives [Member] | Level 3 [Member]
Derivative and credit risk transfer strip assets:
Derivative assets	$ 5,275				$ 14,511

Fair Value - Summary of Changes

Fair Value - Summary of Changes in Items Measured Using Level 3 Inputs on Recurring Basis (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets:
Amounts received as proceeds from sales of loans	$ 837,706	$ 356,755	$ 41,379
Transfers:
Loans to REO	(23,672)	(32,578)	(87,202)
Firm commitment to purchase CRT securities to CRT strips	56,804	0	0
Interest Rate Lock Commitments [Member]
Assets:
Beginning balance	11,988
Transfers:
Ending balance	11,154	11,988
Firm commitment to purchase CRT securities [Member]
Assets:
Beginning balance	37,994
Transfers:
Ending balance	109,513	37,994
Recurring [Member]
Assets:
Beginning balance	1,702,165	1,984,616	1,732,446
Purchases and issuances	103,008	36,781	51,363
Repayments and sales	(318,016)	(756,314)	(649,591)
Capitalization of interest and fees	12,609	22,577	47,746
Capitalization of advances	1,340	5,481	18,923
ESS received pursuant to a recapture agreement with PFSI	1,757	2,688	5,244
Amounts received as proceeds from sales of loans	937,011	387,350	41,379
Changes in fair value included in income arising from:
Changes in instrument-specific credit risk	3,737	2,907	24,685
Other factors	(241,971)	37,067	122,140
Total	(238,234)	39,974	146,825
Transfers:
Loans to REO	(12,412)	(47,786)	(104,806)
Loans acquired for sale at fair value from "Level 2" to "Level 3"	809	10,081	2,506
Firm commitment to purchase CRT securities to CRT strips	0
Interest rate lock commitments to loans acquired for sale	(146,018)	16,717	(80,454)
Ending balance	2,044,019	1,702,165	1,984,616
Changes in fair value recognized during the year relating to assets	(452,119)	6,540	43,565
Recurring [Member] | Change in Accounting Principle on Adoption of Fair Value Accounting for Mortgage Servicing Rights [Member]
Assets:
Beginning balance		773,035
Transfers:
Ending balance			773,035
Recurring [Member] | Previously Reported [Member]
Assets:
Beginning balance		1,211,581
Transfers:
Ending balance			1,211,581
Recurring [Member] | CRT Strips [Member]
Assets:
Beginning balance	0
Purchases and issuances	0
Repayments and sales	(32,200)
Capitalization of interest and fees	0
Capitalization of advances	0
ESS received pursuant to a recapture agreement with PFSI	0
Amounts received as proceeds from sales of loans	0
Changes in fair value included in income arising from:
Changes in instrument-specific credit risk	0
Other factors	30,326
Total	30,326
Transfers:
Loans to REO	0
Loans acquired for sale at fair value from "Level 2" to "Level 3"	0
Firm commitment to purchase CRT securities to CRT strips	56,804
Interest rate lock commitments to loans acquired for sale	0
Ending balance	54,930	0
Changes in fair value recognized during the year relating to assets	(1,874)
Recurring [Member] | CRT Derivatives [Member]
Assets:
Beginning balance	123,987	98,640	15,610
Purchases and issuances	0	0	0
Repayments and sales	(78,172)	(86,928)	(51,731)
Capitalization of interest and fees	0	0	0
Capitalization of advances	0	0	0
ESS received pursuant to a recapture agreement with PFSI	0	0	0
Amounts received as proceeds from sales of loans	0	0	0
Changes in fair value included in income arising from:
Changes in instrument-specific credit risk	0	0	0
Other factors	70,048	112,275	134,761
Total	70,048	112,275	134,761
Transfers:
Loans to REO	0	0	0
Loans acquired for sale at fair value from "Level 2" to "Level 3"	0	0	0
Firm commitment to purchase CRT securities to CRT strips	0
Interest rate lock commitments to loans acquired for sale	0	0	0
Ending balance	115,863	123,987	98,640
Changes in fair value recognized during the year relating to assets	(9,571)	25,347	83,030
Recurring [Member] | Loans acquired for sale [Member]
Assets:
Beginning balance	17,474	8,135	5,682
Purchases and issuances	26,823	12,208	11,415
Repayments and sales	(27,609)	(12,934)	(12,513)
Capitalization of interest and fees	0	0	0
Capitalization of advances	0	0	0
ESS received pursuant to a recapture agreement with PFSI	0	0	0
Amounts received as proceeds from sales of loans	0	0	0
Changes in fair value included in income arising from:
Changes in instrument-specific credit risk	0	0	0
Other factors	1,070	(16)	1,045
Total	1,070	(16)	1,045
Transfers:
Loans to REO	0	0	0
Loans acquired for sale at fair value from "Level 2" to "Level 3"	809	10,081	2,506
Firm commitment to purchase CRT securities to CRT strips	0
Interest rate lock commitments to loans acquired for sale	0	0	0
Ending balance	18,567	17,474	8,135
Changes in fair value recognized during the year relating to assets	121	(158)	98
Recurring [Member] | Interest Rate Lock Commitments [Member]
Assets:
Beginning balance	11,988	4,632	3,777
Purchases and issuances	65,051	4,655	36,005
Repayments and sales	0	0	0
Capitalization of interest and fees	0	0	0
Capitalization of advances	0	0	0
ESS received pursuant to a recapture agreement with PFSI	0	0	0
Amounts received as proceeds from sales of loans	0	0	0
Changes in fair value included in income arising from:
Changes in instrument-specific credit risk	0	0	0
Other factors	80,133	(14,016)	45,304
Total	80,133	(14,016)	45,304
Transfers:
Loans to REO	0	0	0
Loans acquired for sale at fair value from "Level 2" to "Level 3"	0	0	0
Firm commitment to purchase CRT securities to CRT strips	0
Interest rate lock commitments to loans acquired for sale	(146,018)	16,717	(80,454)
Ending balance	11,154	11,988	4,632
Changes in fair value recognized during the year relating to assets	11,154	11,988	4,632
Recurring [Member] | Interest-only security payable [Member]
Liabilities:
Beginning balance	36,011	7,070	4,114
Changes in fair value included in income arising from:
Changes in instrument-specific credit risk\Other factors	(10,302)	28,941	2,956
Ending balance	25,709	36,011	7,070
Changes in fair value recognized during the quarter relating to liability	(10,302)	28,941	2,956
Recurring [Member] | Interest-only security payable [Member] | Credit Risk [Member]
Changes in fair value included in income arising from:
Changes in instrument-specific credit risk\Other factors	0	0	0
Recurring [Member] | Interest-only security payable [Member] | Other Factors [Member]
Changes in fair value included in income arising from:
Changes in instrument-specific credit risk\Other factors	(10,302)	28,941	2,956
Recurring [Member] | Excess servicing spread [Member]
Assets:
Beginning balance	117,732	768,433	1,354,572
Purchases and issuances	1,077	0	0
Repayments and sales	(88,460)	(600,638)	(530,367)
Capitalization of interest and fees	2,318	7,439	30,795
Capitalization of advances	1,340	5,481	18,923
ESS received pursuant to a recapture agreement with PFSI	0	0	0
Amounts received as proceeds from sales of loans	0	0	0
Changes in fair value included in income arising from:
Changes in instrument-specific credit risk	3,737	2,907	24,685
Other factors	(10,906)	(18,104)	(25,369)
Total	(7,169)	(15,197)	(684)
Transfers:
Loans to REO	(12,412)	(47,786)	(104,806)
Loans acquired for sale at fair value from "Level 2" to "Level 3"	0	0	0
Firm commitment to purchase CRT securities to CRT strips	0
Interest rate lock commitments to loans acquired for sale	0	0	0
Ending balance	14,426	117,732	768,433
Changes in fair value recognized during the year relating to assets	(8,255)	(18,428)	(10,594)
Recurring [Member] | Excess servicing spread [Member]
Assets:
Beginning balance	216,110	236,534	288,669
Purchases and issuances	0	0	0
Repayments and sales	(40,316)	(46,750)	(54,980)
Capitalization of interest and fees	10,291	15,138	16,951
Capitalization of advances	0	0	0
ESS received pursuant to a recapture agreement with PFSI	1,757	2,688	5,244
Amounts received as proceeds from sales of loans	0	0	0
Changes in fair value included in income arising from:
Changes in instrument-specific credit risk	0	0	0
Other factors	(9,256)	8,500	(19,350)
Total	(9,256)	8,500	(19,350)
Transfers:
Loans to REO	0	0	0
Loans acquired for sale at fair value from "Level 2" to "Level 3"	0	0	0
Firm commitment to purchase CRT securities to CRT strips	0
Interest rate lock commitments to loans acquired for sale	0	0	0
Ending balance	178,586	216,110	236,534
Changes in fair value recognized during the year relating to assets	(9,256)	8,500	(19,350)
Recurring [Member] | Firm commitment to purchase CRT securities [Member]
Assets:
Beginning balance	37,994	0
Purchases and issuances	0	0
Repayments and sales	(31,925)	0
Capitalization of interest and fees	0	0
Capitalization of advances	0	0
ESS received pursuant to a recapture agreement with PFSI	0	0
Amounts received as proceeds from sales of loans	99,305	30,595
Changes in fair value included in income arising from:
Changes in instrument-specific credit risk	0	0
Other factors	60,943	7,399
Total	60,943	7,399
Transfers:
Loans to REO	0	0
Loans acquired for sale at fair value from "Level 2" to "Level 3"	0	0
Firm commitment to purchase CRT securities to CRT strips	(56,804)
Interest rate lock commitments to loans acquired for sale	0	0
Ending balance	109,513	37,994	0
Changes in fair value recognized during the year relating to assets	29,808	37,994
Recurring [Member] | Mortgage servicing rights [Member]
Assets:
Beginning balance	1,162,369	864,494	64,136
Purchases and issuances	0	0	79
Repayments and sales	(17)	(100)	0
Capitalization of interest and fees	0	0	0
Capitalization of advances	0	0	0
ESS received pursuant to a recapture agreement with PFSI	0	0	0
Amounts received as proceeds from sales of loans	837,706	356,755	41,379
Changes in fair value included in income arising from:
Changes in instrument-specific credit risk	0	0	0
Other factors	(464,353)	(58,780)	(14,135)
Total	(464,353)	(58,780)	(14,135)
Transfers:
Loans to REO	0	0	0
Loans acquired for sale at fair value from "Level 2" to "Level 3"	0	0	0
Firm commitment to purchase CRT securities to CRT strips	0
Interest rate lock commitments to loans acquired for sale	0	0	0
Ending balance	1,535,705	1,162,369	864,494
Changes in fair value recognized during the year relating to assets	(464,353)	(58,780)	(14,135)
Recurring [Member] | Mortgage servicing rights [Member] | Change in Accounting Principle on Adoption of Fair Value Accounting for Mortgage Servicing Rights [Member]
Assets:
Beginning balance		773,035
Transfers:
Ending balance			773,035
Recurring [Member] | Mortgage servicing rights [Member] | Previously Reported [Member]
Assets:
Beginning balance		91,459
Transfers:
Ending balance			91,459
Recurring [Member] | Repurchase Agreement Derivatives [Member]
Assets:
Beginning balance	14,511	3,748	0
Purchases and issuances	10,057	19,918	3,864
Repayments and sales	(19,317)	(8,964)	0
Capitalization of interest and fees	0	0	0
Capitalization of advances	0	0	0
ESS received pursuant to a recapture agreement with PFSI	0	0	0
Amounts received as proceeds from sales of loans	0	0	0
Changes in fair value included in income arising from:
Changes in instrument-specific credit risk	0	0	0
Other factors	24	(191)	(116)
Total	24	(191)	(116)
Transfers:
Loans to REO	0	0	0
Loans acquired for sale at fair value from "Level 2" to "Level 3"	0	0	0
Firm commitment to purchase CRT securities to CRT strips	0
Interest rate lock commitments to loans acquired for sale	0	0	0
Ending balance	5,275	14,511	3,748
Changes in fair value recognized during the year relating to assets	$ 107	$ 77	$ (116)

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	Dec. 31, 2019	Dec. 31, 2018
Loans, fair value [Abstract]
Fair value	$ 270,793	$ 408,305
Fair value, Total	270,793	408,305
Loans, principal amount due upon maturity [Abstract]
Principal amount due upon maturity	287,288	495,651
Principal amount due upon maturity	286,479	495,651
Loans, difference, [Abstract]
Difference	(16,495)	(87,346)
Loans acquired for sale at fair value [Member]
Loans, fair value [Abstract]
Current through 89 days delinquent:	4,147,374	1,643,465
90 or more days delinquent, not in foreclosure	572	492
90 or more days delinquent, in foreclosure	479	0
Fair value	1,051	492
Fair value, Total	4,148,425	1,643,957
Loans, principal amount due upon maturity [Abstract]
Current through 89 days delinquent:	4,010,444	1,580,504
90 or more days delinquent, not in foreclosure	615	492
90 or more days delinquent, in foreclosure	566	0
Principal amount due upon maturity	4,011,625	1,580,996
Loans, difference, [Abstract]
Current through 89 days delinquent:	136,930	62,961
90 or more days delinquent, not in foreclosure	(43)	0
90 or more days delinquent, in foreclosure	(87)	0
Difference	136,800	62,961
Loans acquired for sale at fair value [Member] | Nonperforming mortgage loans [Member]
Loans, principal amount due upon maturity [Abstract]
Principal amount due upon maturity	1,181	492
Loans, difference, [Abstract]
Difference	(130)	0
Loans at Fair Value Held in Consolidated VIE [Member]
Loans, fair value [Abstract]
Current through 89 days delinquent:	255,706	290,573
90 or more days delinquent, not in foreclosure	661	0
90 or more days delinquent, in foreclosure	0	0
Fair value	256,367	290,573
Loans, principal amount due upon maturity [Abstract]
Current through 89 days delinquent:	251,425	294,617
90 or more days delinquent, not in foreclosure	809	0
90 or more days delinquent, in foreclosure	0	0
Principal amount due upon maturity	252,234	294,617
Loans, difference, [Abstract]
Current through 89 days delinquent:	4,281	(4,044)
90 or more days delinquent, not in foreclosure	(148)	0
90 or more days delinquent, in foreclosure	0	0
Difference	4,133	(4,044)
Loans at Fair Value Held in Consolidated VIE [Member] | Nonperforming mortgage loans [Member]
Loans, fair value [Abstract]
Fair value	661	0
Loans, principal amount due upon maturity [Abstract]
Principal amount due upon maturity	809	0
Loans, difference, [Abstract]
Difference	(148)	0
Loans and Mortgage Loans under Forward Purchase Agreements at Fair Value [Member]
Loans, fair value [Abstract]
Current through 89 days delinquent:	3,179	28,806
90 or more days delinquent, not in foreclosure	4,897	37,288
90 or more days delinquent, in foreclosure	6,350	51,638
Fair value	14,426	117,732
Loans, principal amount due upon maturity [Abstract]
Current through 89 days delinquent:	6,202	43,043
90 or more days delinquent, not in foreclosure	13,154	71,732
90 or more days delinquent, in foreclosure	15,698	86,259
Principal amount due upon maturity	35,054	201,034
Loans, difference, [Abstract]
Current through 89 days delinquent:	(3,023)	(14,237)
90 or more days delinquent, not in foreclosure	(8,257)	(34,444)
90 or more days delinquent, in foreclosure	(9,348)	(34,621)
Difference	(20,628)	(83,302)
Loans and Mortgage Loans under Forward Purchase Agreements at Fair Value [Member] | Nonperforming mortgage loans [Member]
Loans, fair value [Abstract]
Fair value	11,247	88,926
Loans, principal amount due upon maturity [Abstract]
Principal amount due upon maturity	28,852	157,991
Loans, difference, [Abstract]
Difference	$ (17,605)	$ (69,065)

Fair Value - Summary of Chang_2

Fair Value - Summary of Changes in Fair Value Included in Current Period Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Credit Risk Transfer Strips [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income	$ 30,326
Net Gain (Loss) on Investments [Member] | Credit Risk Transfer Strips [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income	30,326
Net Gain on Loans Acquired for Sale [Member] | Credit Risk Transfer Strips [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income	0
Net Loan Servicing Fees [Member] | Credit Risk Transfer Strips [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income	0
Net Interest Income [Member] | Credit Risk Transfer Strips [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income	0
Interest-only security payable [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income	10,302	$ (28,941)	$ 2,956
Interest-only security payable [Member] | Net Gain (Loss) on Investments [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income	10,302	(28,941)	2,956
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	0	0	0
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	0	0	0
Interest-only security payable [Member] | Net Interest Income [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income	0	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	(9,614)	9,033	(5,207)
Asset-Backed Financing of the VIE at Fair Value [Member] | Net Gain (Loss) on Investments [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income	(7,553)	9,610	(3,426)
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	0	0	0
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	0	0	0
Asset-Backed Financing of the VIE at Fair Value [Member] | Net Interest Income [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income	(2,061)	(577)	(1,781)
Liabilities, Total [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income	688	(19,908)	(2,251)
Liabilities, Total [Member] | Net Gain (Loss) on Investments [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income	2,749	(19,331)	(470)
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	0	0	0
Liabilities, Total [Member] | Net Loan Servicing Fees [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income	0	0	0
Liabilities, Total [Member] | Net Interest Income [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income	(2,061)	(577)	(1,781)
Loans acquired for sale at fair value [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income	163,244	(5,298)	97,940
Loans acquired for sale at fair value [Member] | Net Gain (Loss) on Investments [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income	0	0	0
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	163,244	(5,298)	97,940
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	0	0	0
Loans acquired for sale at fair value [Member] | Net Interest Income [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income	0	0	0
Loans at fair value [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income	4,134	(16,157)	35,821
Loans at fair value [Member] | Net Gain (Loss) on Investments [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income	714	(23,696)	3,582
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	0	0	0
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	0	0	0
Loans at fair value [Member] | Net Interest Income [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income	3,420	7,539	32,239
Mortgage-backed securities at fair value [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income	64,430	(16,055)	10,865
Mortgage-backed securities at fair value [Member] | Net Gain (Loss) on Investments [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income	77,283	(11,262)	5,498
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	0	0	0
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	0	0	0
Mortgage-backed securities at fair value [Member] | Net Interest Income [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income	(12,853)	(4,793)	5,367
Firm commitment to purchase CRT securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income	160,248	37,994
Firm commitment to purchase CRT securities [Member] | Net Gain (Loss) on Investments [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income	60,943	7,399
Firm commitment to purchase CRT securities [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	99,305	30,595
Firm commitment to purchase CRT securities [Member] | Net Loan Servicing Fees [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income	0	0
Firm commitment to purchase CRT securities [Member] | Net Interest Income [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income	0	0
Excess servicing spread [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income	1,035	23,638	(2,399)
Excess servicing spread [Member] | Net Gain (Loss) on Investments [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income	(9,256)	8,500	(19,350)
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	0	0	0
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	0	0	0
Excess servicing spread [Member] | Net Interest Income [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income	10,291	15,138	16,951
MSRs at fair value [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income	(464,353)	(58,780)	(14,135)
MSRs at fair value [Member] | Net Gain (Loss) on Investments [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income	0	0	0
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	0	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	(464,353)	(58,780)	(14,135)
MSRs at fair value [Member] | Net Interest Income [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income	0	0	0
Assets, Total [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income	(40,936)	(34,658)	128,092
Assets, Total [Member] | Net Gain (Loss) on Investments [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income	160,010	(19,059)	(10,270)
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	262,549	25,297	97,940
Assets, Total [Member] | Net Loan Servicing Fees [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income	(464,353)	(58,780)	(14,135)
Assets, Total [Member] | Net Interest Income [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in fair value included in current period income	$ 858	$ 17,884	$ 54,557

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	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate acquired in settlement of loans	$ 24,115	$ 24,515
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	$ 24,115	$ 24,515

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	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MSRs at lower of amortized cost or fair value		$ 0	$ 5,876
Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate asset acquired in settlement of loans	$ (2,155)	(4,434)	(11,882)
MSRs at lower of amortized cost or fair value	0	0	(5,876)
Total assets, gains (losses) recognized	$ (2,155)	$ (4,434)	$ (17,758)

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	Dec. 31, 2019	Dec. 31, 2018
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	$ 1,696,295	$ 445,573
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	1,705,544	444,403
Exchangeable Notes [Member] | Carrying Value [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Notes payable	443,506	248,350
Exchangeable Notes [Member] | Fair Value [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Notes payable	$ 462,117	$ 247,172

Fair Value - Additional Informa

Fair Value - Additional Information (Detail) - Level 3 [Member]	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Repurchase Agreement Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Ratios included in estimated fair value	99.00%	97.00%
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 - Quantitative Summa

Fair Value - Quantitative Summary of Key Inputs Used in Valuation of Level 3 Loans at Fair Value (Detail) - Loans at fair value [Member] $ in Thousands	Dec. 31, 2018USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	$ 117,732
Discount Rate [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation	0.028
Discount Rate [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation	0.196
Discount Rate [Member] | Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation	0.120
Twelve-Month Projected Housing Price Index Change [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation	0.031
Twelve-Month Projected Housing Price Index Change [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation	0.037
Twelve-Month Projected Housing Price Index Change [Member] | Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation	0.034
Voluntary Prepayment Speed [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation	0.009
Voluntary Prepayment Speed [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation	0.083
Voluntary Prepayment Speed [Member] | Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation	0.032
Total Prepayment Speed [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation	0.083
Total Prepayment Speed [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation	0.220
Total Prepayment Speed [Member] | Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation	0.183

Fair Value - Summary of Key Inp

Fair Value - Summary of Key Inputs Used in Determining Fair Value of ESS (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Excess servicing spread purchased from PFSI	$ 178,586	$ 216,110		$ 183,141	$ 194,156	$ 205,081	$ 223,275	$ 229,470	$ 236,002
UPB of underlying loans (in thousands)	59,951,884	28,923,523	$ 3,724,642
Excess servicing spread [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Excess servicing spread purchased from PFSI	178,586	216,110
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)	$ 19,904,571	$ 23,196,033
Average servicing fee rate (in basis points)	0.34%	0.34%
Average ESS rate (in basis points)	0.19%	0.19%
Pricing spread	3.10%	3.10%
Annual total prepayment speed	11.00%	9.70%
Life (in years)	6 years 1 month 6 days	6 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	3.00%	2.80%
Annual total prepayment speed	8.70%	8.20%
Life (in years)	2 years 8 months 12 days	1 year 7 months 6 days
Excess servicing spread [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Pricing spread	3.30%	3.20%
Annual total prepayment speed	16.20%	29.50%
Life (in years)	7 years 2 months 12 days	7 years 7 months 6 days

Fair Value - Quantitative Sum_2

Fair Value - Quantitative Summary of Key Unobservable Inputs Used in Review and Approval of Broker-provided Fair Values for CRT Agreements (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deposits securing CRT arrangements	$ 1,969,784	$ 1,146,501
CRT Agreements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of CRT derivatives	115,863	123,987
Deposits securing CRT arrangements	1,524,590	1,146,501
UPB of loans in reference pools	$ 24,824,616	$ 29,934,003
CRT Agreements [Member] | Discount Rate [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in fair value for CRT agreements	4.70%	6.60%
CRT Agreements [Member] | Discount Rate [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in fair value for CRT agreements	5.30%	7.50%
CRT Agreements [Member] | Discount Rate [Member] | Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in fair value for CRT agreements	5.20%	7.30%
CRT Agreements [Member] | Voluntary Prepayment Speed [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in fair value for CRT agreements	16.40%	9.00%
CRT Agreements [Member] | Voluntary Prepayment Speed [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in fair value for CRT agreements	18.50%	10.60%
CRT Agreements [Member] | Voluntary Prepayment Speed [Member] | Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in fair value for CRT agreements	17.90%	9.90%
CRT Agreements [Member] | Total Prepayment Speed [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in fair value for CRT agreements	0.20%	0.20%
CRT Agreements [Member] | Total Prepayment Speed [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in fair value for CRT agreements	0.30%	0.20%
CRT Agreements [Member] | Total Prepayment Speed [Member] | Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in fair value for CRT agreements	0.30%	0.20%
CRT Agreements [Member] | Remaining Loss Expectation [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in fair value for CRT agreements	0.10%	0.10%
CRT Agreements [Member] | Remaining Loss Expectation [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in fair value for CRT agreements	0.10%	0.20%
CRT Agreements [Member] | Remaining Loss Expectation [Member] | Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in fair value for CRT agreements	0.10%	0.20%

Fair Value - Quantitative Sum_3

Fair Value - Quantitative Summary of Key Unobservable Inputs Used in Valuation of Interest Rate Lock Commitments (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
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	64.60%	45.40%
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%
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	93.30%	91.80%
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	21.00%	2.40%
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	5.80%	5.60%
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	4.70%	4.30%
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	0.70%	0.60%
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	2.20%	3.60%
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	1.40%	2.20%
Interest Rate Lock Commitments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	$ 11,154	$ 11,988

Fair Value - Summary of Key Uno

Fair Value - Summary of Key Unobservable Inputs Used in Valuation Credit Risk Transfer Strips (Detail)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
CRT strips	$ 54,930,000	$ 0
Deposits securing CRT arrangements	1,969,784,000	$ 1,146,501,000
CRT Strips [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
CRT strips	54,930,000
Deposits securing CRT arrangements	445,194
UPB of loans in the reference pools	$ 17,119,501,000
Discount Rate [Member] | CRT Strips [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation	0.063
Voluntary Prepayment Speed [Member] | CRT Strips [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation	0.234
Involuntary Prepayment Speed [Member] | CRT Strips [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation	0.002
Remaining Loss Expectation [Member] | CRT Strips [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation	0.001

Fair Value - Summary of Key U_2

Fair Value - Summary of Key Unobservable Inputs Used in Valuation of Firm Commitment to Purchase CRT Securities (Detail) - Firm commitment to purchase CRT securities [Member] $ in Thousands	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	$ 109,513	$ 37,994
UPB of loans in the reference pools	$ 38,738,396	$ 16,392,300
Discount Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation	0.065	0.079
Voluntary Prepayment Speed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation	0.143	0.124
Involuntary Prepayment Speed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation	0.001	0.001
Remaining Loss Expectation [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Key inputs used in valuation	0.001	0.001

Fair Value - Key Assumptions Us

Fair Value - Key Assumptions Used in Determining Fair Value of MSRs at Time of Initial Recognition (Detail)	12 Months Ended
	Dec. 31, 2019USD ($)$ / Loan	Dec. 31, 2018USD ($)$ / Loan	Dec. 31, 2017USD ($)$ / Loan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, MSR recognized	$ 837,706,000	$ 356,755,000	$ 41,379,000
Fair Value, UPB of underlying loans	$ 59,951,884,000	$ 28,923,523,000	$ 3,724,642,000
Fair Value, Weighted-average annual servicing fee rate (in basis points)	0.31%	0.26%	0.25%
Amortized Cost, MSR recognized		$ 0	$ 248,930,000
Amortized Cost, UPB of underlying loans			$ 19,982,686,000
Amortized Cost, Weighted-average annual servicing fee rate (in basis points)			0.25%
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value inputs, Pricing spread during period	5.60%	5.80%	7.60%
Fair Value inputs, Prepayment speed during period	8.50%	3.20%	7.90%
Fair Value inputs, Weighted average life during period	3 years 1 month 6 days	2 years 3 months 18 days	2 years 9 months 18 days
Fair Value inputs, Annual per loan cost of servicing during period | $ / Loan	78	77	79
Amortized Cost, Pricing spread during period			7.60%
Amortized Cost, Annual prepayment speed during period			3.20%
Amortized Cost, Life (in years)			2 years 7 months 6 days
Amortized Cost, Annual per loan cost of servicing during period			$ 79
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value inputs, Pricing spread during period	9.90%	12.90%	7.60%
Fair Value inputs, Prepayment speed during period	26.10%	35.30%	29.50%
Fair Value inputs, Weighted average life during period	7 years 8 months 12 days	11 years 10 months 24 days	8 years 6 months
Fair Value inputs, Annual per loan cost of servicing during period | $ / Loan	78	79	79
Amortized Cost, Pricing spread during period			12.60%
Amortized Cost, Annual prepayment speed during period			31.10%
Amortized Cost, Life (in years)			11 years 10 months 24 days
Amortized Cost, Annual per loan cost of servicing during period			$ 79
Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value inputs, Pricing spread during period	6.10%	6.90%	7.60%
Fair Value inputs, Prepayment speed during period	11.70%	9.90%	10.70%
Fair Value inputs, Weighted average life during period	6 years 9 months 18 days	7 years 7 months 6 days	7 years 3 months 18 days
Fair Value inputs, Annual per loan cost of servicing during period | $ / Loan	78	79	79
Amortized Cost, Pricing spread during period			7.60%
Amortized Cost, Annual prepayment speed during period			8.00%
Amortized Cost, Life (in years)			8 years 3 months 18 days
Amortized Cost, Annual per loan cost of servicing during period			$ 79

Fair Value - Quantitative Sum_4

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	12 Months Ended
	Dec. 31, 2019USD ($)$ / Loan	Dec. 31, 2018USD ($)$ / Loan	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Balance at end of period	$ 1,535,705	$ 1,162,369	$ 91,459	$ 64,136
UPB of underlying loans, Fair Value	$ 131,024,381	$ 92,410,226
Weighted-average annual servicing fee rate (in basis points), Fair value input	0.28%	0.25%
Weighted-average note interest rate, Fair value	4.20%	4.20%
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	$ (20,666)	$ (13,872)
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	(40,783)	(27,428)
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	(79,453)	(53,626)
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	(35,768)	(21,661)
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	(69,973)	(42,458)
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	(134,068)	(81,660)
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	(9,964)	(8,298)
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	(19,928)	(16,597)
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	$ (39,856)	$ (33,194)
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value inputs, Pricing spread	6.80%	5.70%
Estimated fair value inputs, Prepayment speed	10.20%	8.10%
Estimated fair value inputs, Annual per-loan cost of servicing | $ / Loan	77	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)	2 years 4 months 24 days	2 years 8 months 12 days
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value inputs, Pricing spread	9.90%	10.70%
Estimated fair value inputs, Prepayment speed	22.00%	27.10%
Estimated fair value inputs, Annual per-loan cost of servicing | $ / Loan	79	78
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)	6 years 6 months	7 years 3 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%	5.80%
Estimated fair value inputs, Prepayment speed	12.10%	9.80%
Estimated fair value inputs, Annual per-loan cost of servicing | $ / Loan	78	78
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)	6 years 3 months 18 days	7 years 1 month 6 days

Mortgage Backed Securities - Su

Mortgage Backed Securities - Summary of Investment in Mortgage Backed Securities Activity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Mortgage Backed Securities [Line Items]
Balance at beginning of year	$ 2,610,422
Changes in fair value included in income arising from:
Balance at end of year	2,839,633	$ 2,610,422
Mortgage Backed Securities [Member]
Mortgage Backed Securities [Line Items]
Balance at beginning of year	2,610,422	989,461	$ 865,061
Purchases	1,250,289	1,810,877	251,872
Sales	(704,178)	0	(1,206)
Repayments	(381,330)	(173,862)	(126,385)
Changes in fair value included in income arising from:
Amortization of purchase premiums	(12,853)	(4,792)	(5,367)
Valuation adjustments	77,283	(11,262)	5,486
Total changes in fair value included in income	64,430	(16,054)	119
Balance at end of year	$ 2,839,633	$ 2,610,422	$ 989,461

Mortgage Backed Securities - _2

Mortgage Backed Securities - Summary of Investment in Mortgage Backed Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Mortgage Backed Securities [Line Items]
Fair value	$ 2,839,633	$ 2,325,010	$ 2,600,357	$ 2,589,106	$ 2,610,422	$ 2,126,507	$ 1,698,322	$ 1,436,456
Mortgage Backed Securities [Member]
Mortgage Backed Securities [Line Items]
Principal balance	2,755,798				2,581,503
Unamortized purchase premiums	40,740				46,190
Accumulated valuation changes	43,095				(17,271)
Fair value	2,839,633				2,610,422
Fannie Mae [Member] | Mortgage Backed Securities [Member]
Mortgage Backed Securities [Line Items]
Principal balance	1,946,203				2,050,769
Unamortized purchase premiums	29,657				39,488
Accumulated valuation changes	33,233				(14,920)
Fair value	2,009,093				2,075,337
Freddie Mac [Member] | Mortgage Backed Securities [Member]
Mortgage Backed Securities [Line Items]
Principal balance	809,595				530,734
Unamortized purchase premiums	11,083				6,702
Accumulated valuation changes	9,862				(2,351)
Fair value	$ 830,540				$ 535,085

Mortgage Backed Securities - _3

Mortgage Backed Securities - Summary of Investment in Mortgage Backed Securities (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
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	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans acquired for sale at fair value	$ 4,148,425	$ 1,643,957
Loans pledged to secure total	4,070,134	1,621,879
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	4,070,134	1,436,437
PennyMac Loan Services, LLC [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans acquired for sale at fair value	490,383	86,308
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	0	185,442
Agency-Eligible [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans acquired for sale at fair value	3,626,038	1,495,954
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	490,383	86,308
Jumbo [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans acquired for sale at fair value	13,437	44,221
Commercial Real Estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans acquired for sale at fair value	1,015	8,559
Home Equity Lines of Credit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans acquired for sale at fair value	4,632	0
Repurchased Pursuant to Representations and Warranties [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans acquired for sale at fair value	$ 12,920	$ 8,915

Loans Acquired for Sale at Fa_4

Loans Acquired for Sale at Fair Value - Additional Information (Detail) - PennyMac Loan Services, LLC [Member]	12 Months Ended
	Dec. 31, 2019
Minimum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Sourcing fee on average number of calendar days loans are held prior to purchase by PLS	0.02%
Maximum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Sourcing fee on average number of calendar days loans are held prior to purchase by PLS	0.035%

Loans at Fair Value - Summary o

Loans at Fair Value - Summary of Distribution of Company's Loans at Fair Value (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment [Line Items]
Fair value	$ 270,793	$ 408,305
Unpaid principal balance	286,479	495,651
Asset-backed financing of a VIE at fair value	256,367	290,573
Loans at fair value pledged to secure	268,757	399,266
Loans acquired for sale at fair value [Member]
Financing Receivable, Recorded Investment [Line Items]
Fair value	4,148,425	1,643,957
Assets sold under agreements to repurchase	12,390	108,693
Fixed interest rate jumbo loans held in a VIE [Member]
Financing Receivable, Recorded Investment [Line Items]
Fair value	256,367	290,573
Unpaid principal balance	251,425	294,617
Distressed loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Fair value	14,426	117,732
Unpaid principal balance	35,054	201,034
Distressed loans [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Fair value	11,247	88,926
Unpaid principal balance	28,852	157,991
Distressed loans [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Fair value	3,179	28,806
Unpaid principal balance	$ 6,202	$ 43,043

Derivative and Credit Risk Tr_3

Derivative and Credit Risk Transfer Strips Assets - Summary of Derivative and Credit Risk Transfer Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative assets	$ 147,388				$ 167,165
Credit risk transfer strips	54,930				0
Derivative and credit risk transfer strip assets	$ 202,318	$ 274,444	$ 258,782	$ 188,710	$ 167,165	$ 143,577	$ 133,239	$ 122,518

Derivative and Credit Risk Tr_4

Derivative and Credit Risk Transfer Strips Assets - Summary of Investment In CRT Strips (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Credit risk transfer strips Contractually restricted from sale
CRT strips	$ 54,930	$ 0
CRT strips pledged to secure Assets sold under agreements to repurchase and Notes payable	54,930
Through June 13, 2020 [Member]
Credit risk transfer strips Contractually restricted from sale
CRT strips	17,629
To Maturity [Member]
Credit risk transfer strips Contractually restricted from sale
CRT strips	$ 37,301

Derivative and Credit Risk Tr_5

Derivative and Credit Risk Transfer Strips Assets - Derivative Assets and Derivative Liabilities and Related Margin Deposits Recorded in Other Assets (Detail) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivatives Fair Value [Line Items]
Total derivative assets instruments before netting	$ 153,666,000	$ 171,996,000
Derivative assets, Netting	(6,278,000)	(4,831,000)
Total derivative and credit risk transfer strip assets after netting	147,388,000	167,165,000
Margin deposits placed with derivatives counterparties, net	7,114,000	18,744,000
Derivative assets pledged to secure:
Notes payable	1,696,295,000	445,573,000
Total derivative liabilities	19,816,000	29,490,000
Derivative liabilities, Netting	(13,393,000)	(23,576,000)
Total derivative liabilities after netting	6,423,000	5,914,000
Derivative assets related to CRT Derivatives [Member]
Derivative assets pledged to secure:
Notes payable	115,110,000	0
Assets sold under agreements to repurchase	27,073,000	87,976,000
Repurchase Agreement Derivatives [Member]
Derivatives Fair Value [Line Items]
Total derivative assets instruments before netting	5,275,000	14,511,000
Derivative assets, Netting	0	0
Total derivative and credit risk transfer strip assets after netting	5,275,000	14,511,000
Derivative assets pledged to secure:
Total derivative liabilities	0	0
CRT Derivatives [Member]
Derivatives Fair Value [Line Items]
Notional amount	24,824,616,000	29,934,003,000
Total derivative assets instruments before netting	115,863,000	123,987,000
Derivative assets, Netting	0	0
Total derivative and credit risk transfer strip assets after netting	115,863,000	123,987,000
Derivative assets pledged to secure:
Total derivative liabilities	0	0
Swaptions [Member]
Derivatives Fair Value [Line Items]
Total derivative assets instruments before netting	0	0
Interest Rate Lock Commitments [Member]
Derivatives Fair Value [Line Items]
Notional amount	3,199,680,000	1,688,516,000
Total derivative assets instruments before netting	11,726,000	12,162,000
Total derivative and credit risk transfer strip assets after netting	11,726,000	12,162,000
Derivative assets pledged to secure:
Total derivative liabilities	572,000	174,000
Forward Purchase Contracts [Member]
Derivatives Fair Value [Line Items]
Notional amount	5,883,198,000	3,072,223,000	$ 1,996,235,000	$ 4,840,707,000
Total derivative assets instruments before netting	7,525,000	14,845,000
Derivative assets, Netting	0	0
Total derivative and credit risk transfer strip assets after netting	7,525,000	14,845,000
Derivative assets pledged to secure:
Total derivative liabilities	3,600,000	43,000
Derivative liabilities, Netting	0	0
Forward Sale Contracts [Member]
Derivatives Fair Value [Line Items]
Notional amount	9,297,179,000	4,595,241,000	2,565,271,000	6,148,242,000
Total derivative assets instruments before netting	637,000	13,000
Derivative assets, Netting	0	0
Total derivative and credit risk transfer strip assets after netting	637,000	13,000
Derivative assets pledged to secure:
Total derivative liabilities	15,644,000	29,273,000
Derivative liabilities, Netting	0	0
Swaptions [Member]
Derivatives Fair Value [Line Items]
Notional amount	2,700,000,000	0
Derivative assets pledged to secure:
Total derivative liabilities	0	0
MBS Put Options [Member]
Derivatives Fair Value [Line Items]
Notional amount	4,000,000,000	2,550,000,000	2,375,000,000	925,000,000
Total derivative assets instruments before netting	1,625,000	218,000
Derivative assets, Netting	0	0
Total derivative and credit risk transfer strip assets after netting	1,625,000	218,000
Derivative assets pledged to secure:
Total derivative liabilities	0	0
MBS Call Options [Member]
Derivatives Fair Value [Line Items]
Notional amount	0	500,000,000	0	750,000,000
Total derivative assets instruments before netting	0	945,000
Derivative assets, Netting	0	0
Total derivative and credit risk transfer strip assets after netting	0	945,000
Derivative assets pledged to secure:
Total derivative liabilities	0	0
Call Options on Interest Rate Futures [Member]
Derivatives Fair Value [Line Items]
Notional amount	2,662,500,000	512,500,000	0	200,000,000
Total derivative assets instruments before netting	3,809,000	5,137,000
Derivative assets, Netting	0	0
Total derivative and credit risk transfer strip assets after netting	3,809,000	5,137,000
Derivative assets pledged to secure:
Total derivative liabilities	0	0
Put Options on Interest Rate Futures [Member]
Derivatives Fair Value [Line Items]
Notional amount	950,000,000	1,102,500,000	550,000,000	550,000,000
Total derivative assets instruments before netting	2,859,000	178,000
Derivative assets, Netting	0	0
Total derivative and credit risk transfer strip assets after netting	2,859,000	178,000
Derivative assets pledged to secure:
Total derivative liabilities	0	0
Swap Futures [Member]
Derivatives Fair Value [Line Items]
Notional amount	2,075,000,000	0	275,000,000	$ 150,000,000
Total derivative assets instruments before netting	4,347,000	0
Derivative assets, Netting	0	0
Total derivative and credit risk transfer strip assets after netting	4,347,000	0
Derivative assets pledged to secure:
Total derivative liabilities	0	0
Bond Futures [Member]
Derivatives Fair Value [Line Items]
Notional amount	114,500,000	815,000,000	$ 0
Total derivative assets instruments before netting	0	0
Derivative assets pledged to secure:
Total derivative liabilities	$ 0	$ 0

Derivative and Credit Risk Tr_6

Derivative and Credit Risk Transfer Strips Assets - Summary of Activity in Notional Amount for Derivative Contracts (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Forward Purchase Contracts [Member]
Derivatives Fair Value [Line Items]
Notional amount, beginning of year	$ 3,072,223,000	$ 1,996,235,000	$ 4,840,707,000
Additions	246,730,665,000	97,737,906,000	71,768,061,000
Dispositions/expirations	(243,919,690,000)	(96,661,918,000)	(74,612,533,000)
Notional amount, end of year	5,883,198,000	3,072,223,000	1,996,235,000
Forward Sales Contracts [Member]
Derivatives Fair Value [Line Items]
Notional amount, beginning of year	4,595,241,000	2,565,271,000	6,148,242,000
Additions	322,636,252,000	129,544,573,000	95,889,432,000
Dispositions/expirations	(317,934,314,000)	(127,514,603,000)	(99,472,403,000)
Notional amount, end of year	9,297,179,000	4,595,241,000	2,565,271,000
Swaptions [Member]
Derivatives Fair Value [Line Items]
Notional amount, beginning of year	0
Additions	3,700,000,000
Dispositions/expirations	(1,000,000,000)
Notional amount, end of year	2,700,000,000	0
MBS Put Options [Member]
Derivatives Fair Value [Line Items]
Notional amount, beginning of year	2,550,000,000	2,375,000,000	925,000,000
Additions	56,150,000,000	9,575,000,000	9,225,000,000
Dispositions/expirations	(54,700,000,000)	(9,400,000,000)	(7,775,000,000)
Notional amount, end of year	4,000,000,000	2,550,000,000	2,375,000,000
MBS Call Options [Member]
Derivatives Fair Value [Line Items]
Notional amount, beginning of year	500,000,000	0	750,000,000
Additions	13,200,000,000	2,000,000,000	550,000,000
Dispositions/expirations	(13,700,000,000)	(1,500,000,000)	(1,300,000,000)
Notional amount, end of year	0	500,000,000	0
Call Options on Interest Rate Futures [Member]
Derivatives Fair Value [Line Items]
Notional amount, beginning of year	512,500,000	0	200,000,000
Additions	30,752,000,000	3,487,500,000	825,000,000
Dispositions/expirations	(28,602,000,000)	(2,975,000,000)	(1,025,000,000)
Notional amount, end of year	2,662,500,000	512,500,000	0
Put Options on Interest Rate Futures [Member]
Derivatives Fair Value [Line Items]
Notional amount, beginning of year	1,102,500,000	550,000,000	550,000,000
Additions	31,662,400,000	13,302,500,000	7,150,000,000
Dispositions/expirations	(31,814,900,000)	(12,750,000,000)	(7,150,000,000)
Notional amount, end of year	950,000,000	1,102,500,000	550,000,000
Swap Futures [Member]
Derivatives Fair Value [Line Items]
Notional amount, beginning of year	0	275,000,000	150,000,000
Additions	5,371,970,000	0	1,650,000,000
Dispositions/expirations	(3,296,970,000)	(275,000,000)	(1,525,000,000)
Notional amount, end of year	2,075,000,000	0	275,000,000
Bond Futures [Member]
Derivatives Fair Value [Line Items]
Notional amount, beginning of year	815,000,000	0
Additions	23,330,100,000	5,274,400,000
Dispositions/expirations	(24,030,600,000)	(4,459,400,000)
Notional amount, end of year	114,500,000	815,000,000	0
Eurodollar Future Sale Contracts [Member]
Derivatives Fair Value [Line Items]
Notional amount, beginning of year	$ 0	937,000,000	1,351,000,000
Additions		149,597,000	404,000,000
Dispositions/expirations		(1,086,597,000)	(818,000,000)
Notional amount, end of year		0	937,000,000
Treasury Future Buy Contracts [Member]
Derivatives Fair Value [Line Items]
Notional amount, beginning of year		0	0
Additions			110,700,000
Dispositions/expirations			(110,700,000)
Notional amount, end of year			0
Treasury Future Sale Contracts [Member]
Derivatives Fair Value [Line Items]
Notional amount, beginning of year		$ 0	0
Additions			110,700,000
Dispositions/expirations			(110,700,000)
Notional amount, end of year			$ 0

Derivative and Credit Risk Tr_7

Derivative and Credit Risk Transfer Strips Assets - Summary of Net Derivative Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Offsetting Assets [Line Items]
Gross amounts of recognized assets	$ 153,666	$ 171,996
Gross amounts offset in the consolidated balance sheet	(6,278)	(4,831)
Total derivative and credit risk transfer strip assets after netting	147,388	167,165
Net amounts of assets presented in the consolidated balance sheet	(6,278)	(4,831)
Repurchase Agreement Derivatives [Member]
Offsetting Assets [Line Items]
Gross amounts of recognized assets	5,275	14,511
Gross amounts offset in the consolidated balance sheet	0	0
Total derivative and credit risk transfer strip assets after netting	5,275	14,511
CRT Derivatives [Member]
Offsetting Assets [Line Items]
Gross amounts of recognized assets	115,863	123,987
Gross amounts offset in the consolidated balance sheet	0	0
Total derivative and credit risk transfer strip assets after netting	115,863	123,987
Interest Rate Lock Commitments [Member]
Offsetting Assets [Line Items]
Gross amounts of recognized assets	11,726	12,162
Total derivative and credit risk transfer strip assets after netting	11,726	12,162
Forward Purchase Contracts [Member]
Offsetting Assets [Line Items]
Gross amounts of recognized assets	7,525	14,845
Gross amounts offset in the consolidated balance sheet	0	0
Total derivative and credit risk transfer strip assets after netting	7,525	14,845
Forward Sale Contracts [Member]
Offsetting Assets [Line Items]
Gross amounts of recognized assets	637	13
Gross amounts offset in the consolidated balance sheet	0	0
Total derivative and credit risk transfer strip assets after netting	637	13
Derivatives Not Subject To Master Netting Adjustment [Member]
Offsetting Assets [Line Items]
Gross amounts of recognized assets	132,864	150,660
Gross amounts offset in the consolidated balance sheet	0	0
Total derivative and credit risk transfer strip assets after netting	132,864	150,660
Derivatives Not Subject To Master Netting Adjustment [Member] | Interest Rate Lock Commitments [Member]
Offsetting Assets [Line Items]
Gross amounts of recognized assets	11,726	12,162
Gross amounts offset in the consolidated balance sheet	0	0
Total derivative and credit risk transfer strip assets after netting	11,726	12,162
MBS Put Options [Member]
Offsetting Assets [Line Items]
Gross amounts of recognized assets	1,625	218
Gross amounts offset in the consolidated balance sheet	0	0
Total derivative and credit risk transfer strip assets after netting	1,625	218
MBS Call Options [Member]
Offsetting Assets [Line Items]
Gross amounts of recognized assets	0	945
Gross amounts offset in the consolidated balance sheet	0	0
Total derivative and credit risk transfer strip assets after netting	0	945
Call Options on Interest Rate Futures [Member]
Offsetting Assets [Line Items]
Gross amounts of recognized assets	3,809	5,137
Gross amounts offset in the consolidated balance sheet	0	0
Total derivative and credit risk transfer strip assets after netting	3,809	5,137
Put Options on Interest Rate Futures [Member]
Offsetting Assets [Line Items]
Gross amounts of recognized assets	2,859	178
Gross amounts offset in the consolidated balance sheet	0	0
Total derivative and credit risk transfer strip assets after netting	2,859	178
Swap Futures [Member]
Offsetting Assets [Line Items]
Gross amounts of recognized assets	4,347	0
Gross amounts offset in the consolidated balance sheet	0	0
Total derivative and credit risk transfer strip assets after netting	4,347	0
Netting [Member]
Offsetting Assets [Line Items]
Gross amounts of recognized assets	0	0
Gross amounts offset in the consolidated balance sheet	(6,278)	(4,831)
Total derivative and credit risk transfer strip assets after netting	(6,278)	(4,831)
Derivatives Subject to Master Netting Arrangements [Member]
Offsetting Assets [Line Items]
Gross amounts of recognized assets	20,802	21,336
Gross amounts offset in the consolidated balance sheet	(6,278)	(4,831)
Total derivative and credit risk transfer strip assets after netting	$ 14,524	$ 16,505

Derivative and Credit Risk Tr_8

Derivative and Credit Risk Transfer Strips Assets - Summary of Derivative Assets, Financial Instruments and Collateral Held by Counterparty (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Offsetting Assets [Line Items]
Total derivative and credit risk transfer strip assets after netting	$ 147,388	$ 167,165
Financial instruments	0	0
Cash collateral received	0	0
Net amount	147,388	167,165
CRT Derivatives [Member]
Offsetting Assets [Line Items]
Total derivative and credit risk transfer strip assets after netting	115,863	123,987
Financial instruments	0	0
Cash collateral received	0	0
Net amount	115,863	123,987
Interest Rate Lock Commitments [Member]
Offsetting Assets [Line Items]
Total derivative and credit risk transfer strip assets after netting	11,726	12,162
Financial instruments	0	0
Cash collateral received	0	0
Net amount	11,726	12,162
J.P. Morgan Securities LLC [Member]
Offsetting Assets [Line Items]
Total derivative and credit risk transfer strip assets after netting	1,551	107
Financial instruments	0
Cash collateral received	0
Net amount	1,551	107
RJ O'Brien & Associates, LLC [Member]
Offsetting Assets [Line Items]
Total derivative and credit risk transfer strip assets after netting	6,668	5,315
Financial instruments	0	0
Cash collateral received	0	0
Net amount	6,668	5,315
Citigroup Global Markets Inc. [Member]
Offsetting Assets [Line Items]
Total derivative and credit risk transfer strip assets after netting	0	971
Financial instruments	0	0
Cash collateral received	0	0
Net amount	0	971
Morgan Stanley & Co. LLC [Member]
Offsetting Assets [Line Items]
Total derivative and credit risk transfer strip assets after netting	821	243
Financial instruments	0	0
Cash collateral received	0	0
Net amount	821	243
Bank of America, N.A. [Member]
Offsetting Assets [Line Items]
Total derivative and credit risk transfer strip assets after netting	2,489	0
Financial instruments	0	0
Cash collateral received	0	0
Net amount	2,489	0
Deutsche Bank Securities LLC [Member]
Offsetting Assets [Line Items]
Total derivative and credit risk transfer strip assets after netting	5,398	14,511
Financial instruments	0	0
Cash collateral received	0	0
Net amount	5,398	14,511
Wells Fargo Securities, LLC [Member]
Offsetting Assets [Line Items]
Total derivative and credit risk transfer strip assets after netting	1,882	2,800
Financial instruments	0	0
Cash collateral received	0	0
Net amount	1,882	2,800
Federal National Mortgage Association [Member]
Offsetting Assets [Line Items]
Total derivative and credit risk transfer strip assets after netting	0	5,619
Financial instruments	0	0
Cash collateral received	0	0
Net amount	0	5,619
Other [Member]
Offsetting Assets [Line Items]
Total derivative and credit risk transfer strip assets after netting	990	1,450
Financial instruments	0	0
Cash collateral received	0	0
Net amount	$ 990	$ 1,450

Derivative and Credit Risk Tr_9

Derivative and Credit Risk Transfer Strips Assets - Schedule of Offsetting of Derivative Liabilities and Financial Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	$ 6,668,706	$ 4,806,517
Gross amounts offset in the consolidated balance sheet	(13,393)	(23,576)
Net amounts of liabilities presented in the consolidated balance sheet	6,655,313	4,782,941
Unpaid Principal Balance [Member]
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	6,649,179	4,777,486
Gross amounts offset in the consolidated balance sheet	0	0
Net amounts of liabilities presented in the consolidated balance sheet	6,649,179	4,777,486
Forward Purchase Contracts [Member]
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	3,600	43
Gross amounts offset in the consolidated balance sheet	0	0
Net amounts of liabilities presented in the consolidated balance sheet	3,600	43
Forward Sales Contracts [Member]
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	15,644	29,273
Gross amounts offset in the consolidated balance sheet	0	0
Net amounts of liabilities presented in the consolidated balance sheet	15,644	29,273
Derivatives Not Subject To Master Netting Adjustment [Member] | Interest Rate Lock Commitments [Member]
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	572	174
Gross amounts offset in the consolidated balance sheet	0	0
Net amounts of liabilities presented in the consolidated balance sheet	572	174
Netting [Member]
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	0	0
Gross amounts offset in the consolidated balance sheet	(13,393)	(23,576)
Net amounts of liabilities presented in the consolidated balance sheet	(13,393)	(23,576)
Derivatives Subject to Master Netting Arrangements [Member]
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	19,244	29,316
Gross amounts offset in the consolidated balance sheet	(13,393)	(23,576)
Net amounts of liabilities presented in the consolidated balance sheet	5,851	5,740
Derivative Liabilities Before Netting [Member]
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	19,816	29,490
Gross amounts offset in the consolidated balance sheet	(13,393)	(23,576)
Net amounts of liabilities presented in the consolidated balance sheet	6,423	5,914
Unamortized Debt Issuance Costs [Member]
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	(289)	(459)
Gross amounts offset in the consolidated balance sheet	0	0
Net amounts of liabilities presented in the consolidated balance sheet	(289)	(459)
Security Sold Under Agreements to Repurchase [Member]
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	6,648,890	4,777,027
Gross amounts offset in the consolidated balance sheet	0	0
Net amounts of liabilities presented in the consolidated balance sheet	$ 6,648,890	$ 4,777,027

Derivative and Credit Risk T_10

Derivative and Credit Risk Transfer Strips Assets - Summary of Derivative Liabilities, Financial Liabilities and Collateral Pledged by Counterparty (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	$ 6,655,313	$ 4,782,941
Security Sold Under Agreements to Repurchase [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	6,648,890	4,777,027
Security Sold Under Agreements to Repurchase [Member] | Unpaid Principal Balance Before Unamortized Debt Issuance Costs Adjustment [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	6,655,602	4,783,400
Gross amounts not offset in the consolidated balance sheet, Financial instruments	(6,649,179)	(4,777,486)
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	6,423	5,914
Security Sold Under Agreements to Repurchase [Member] | Unpaid Principal Balance Before Unamortized Debt Issuance Costs Adjustment [Member] | Interest Rate Lock Commitments [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	572	174
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	572	174
Security Sold Under Agreements to Repurchase [Member] | J.P. Morgan Securities LLC [Member] | Unpaid Principal Balance Before Unamortized Debt Issuance Costs Adjustment [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	1,736,829	1,441,934
Gross amounts not offset in the consolidated balance sheet, Financial instruments	(1,736,829)	(1,441,934)
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	0	0
Security Sold Under Agreements to Repurchase [Member] | Bank of America, N.A. [Member] | Unpaid Principal Balance Before Unamortized Debt Issuance Costs Adjustment [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	1,339,291	1,307,923
Gross amounts not offset in the consolidated balance sheet, Financial instruments	(1,339,291)	(1,307,584)
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	0	339
Security Sold Under Agreements to Repurchase [Member] | Morgan Stanley & Co. LLC [Member] | Unpaid Principal Balance Before Unamortized Debt Issuance Costs Adjustment [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	656,728	105,366
Gross amounts not offset in the consolidated balance sheet, Financial instruments	(656,728)	(105,366)
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	0	0
Security Sold Under Agreements to Repurchase [Member] | Credit Suisse Securities (USA) LLC [Member] | Unpaid Principal Balance Before Unamortized Debt Issuance Costs Adjustment [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	720,411	512,662
Gross amounts not offset in the consolidated balance sheet, Financial instruments	(719,902)	(512,662)
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	509	0
Security Sold Under Agreements to Repurchase [Member] | Daiwa Capital Markets [Member] | Unpaid Principal Balance Before Unamortized Debt Issuance Costs Adjustment [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	906,439	254,332
Gross amounts not offset in the consolidated balance sheet, Financial instruments	(906,439)	(254,332)
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	0	0
Security Sold Under Agreements to Repurchase [Member] | Mizuho Securities [Member] | Unpaid Principal Balance Before Unamortized Debt Issuance Costs Adjustment [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	392,038	270,708
Gross amounts not offset in the consolidated balance sheet, Financial instruments	(391,627)	(270,708)
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	411	0
Security Sold Under Agreements to Repurchase [Member] | Citigroup Global Markets Inc. [Member] | Unpaid Principal Balance Before Unamortized Debt Issuance Costs Adjustment [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	412,999	99,626
Gross amounts not offset in the consolidated balance sheet, Financial instruments	(411,933)	(98,644)
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	1,066	982
Security Sold Under Agreements to Repurchase [Member] | BNP Paribas [Member] | Unpaid Principal Balance Before Unamortized Debt Issuance Costs Adjustment [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	116,155	162,636
Gross amounts not offset in the consolidated balance sheet, Financial instruments	(115,733)	(162,357)
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	422	279
Security Sold Under Agreements to Repurchase [Member] | RBC Capital Markets, L.P. [Member] | Unpaid Principal Balance Before Unamortized Debt Issuance Costs Adjustment [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	290,388	57,795
Gross amounts not offset in the consolidated balance sheet, Financial instruments	(290,388)	(57,795)
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	0	0
Security Sold Under Agreements to Repurchase [Member] | Deutsche Bank Securities LLC [Member] | Unpaid Principal Balance Before Unamortized Debt Issuance Costs Adjustment [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	0	495,974
Gross amounts not offset in the consolidated balance sheet, Financial instruments	0	(495,974)
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	0	0
Security Sold Under Agreements to Repurchase [Member] | Amherst Pierpont Securities LLC [Member] | Unpaid Principal Balance Before Unamortized Debt Issuance Costs Adjustment [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	80,309	0
Gross amounts not offset in the consolidated balance sheet, Financial instruments	(80,309)	0
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	0	0
Security Sold Under Agreements to Repurchase [Member] | Federal National Mortgage Association [Member] | Unpaid Principal Balance Before Unamortized Debt Issuance Costs Adjustment [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	1,996	12
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	1,996	12
Security Sold Under Agreements to Repurchase [Member] | Wells Fargo Securities, LLC [Member] | Unpaid Principal Balance Before Unamortized Debt Issuance Costs Adjustment [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	0	70,130
Gross amounts not offset in the consolidated balance sheet, Financial instruments	0	(70,130)
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	0	0
Security Sold Under Agreements to Repurchase [Member] | Other [Member] | Unpaid Principal Balance Before Unamortized Debt Issuance Costs Adjustment [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	1,447	4,128
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	$ 1,447	$ 4,128

Derivative and Credit Risk T_11

Derivative and Credit Risk Transfer Strips Assets - Net Gains (Losses) Recognized on Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
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	$ (834)	$ 7,356	$ 81,309
Interest expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net gains on derivative financial instruments used as economic hedges	24	191	116
Fixed-rate assets and LIBOR- indexed repurchase agreements [Member] | Net gain (loss) on investments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net gains on derivative financial instruments used as economic hedges	28,785	(4,152)	(18,468)
CRT Derivatives [Member] | Net gain (loss) on investments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net gains on derivative financial instruments used as economic hedges	70,048	112,275	134,761
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	80,622	(35,550)	(2,512)
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	$ (91,084)	$ 25,334	$ (31,245)

Real Estate Acquired in Settl_3

Real Estate Acquired in Settlement of Loans - Summary of Financial Information Relating to REO (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Real Estate [Abstract]
Balance at beginning of year		$ 85,681	$ 162,865	$ 274,069
Transfers From loans at fair value and advances		23,672	32,578	87,202
Transfer from real estate held for investment	[1]	30,432	3,401	0
Transfer to real estate held for investment		0	(5,183)	(16,530)
Results of REO:
Valuation adjustments, net		(6,527)	(17,323)	(27,505)
Gain on sale, net		7,298	8,537	12,550
Total gain (loss), net		771	(8,786)	(14,955)
Sales		(74,973)	(99,194)	(166,921)
Balance at end of year		65,583	85,681	$ 162,865
REO pledged to secure assets sold under agreements to repurchase		40,938	1,939
REO held in a consolidated subsidiary whose stock is pledged to secure financings of such properties		0	38,259
Real estate pledged to creditors		$ 40,938	$ 40,198
[1]	During the quarter ended June 30, 2019, the Company committed to liquidate its real estate held for investment and transferred its holdings to real estate acquired in settlement of loans.

Mortgage Servicing Rights - Sum

Mortgage Servicing Rights - Summary of MSRs Carried at Fair Value (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Servicing Asset At Fair Value Changes In Fair Value [Abstract]
Balance at beginning of year		$ 1,162,369	$ 91,459	$ 64,136
Transfer of mortgage servicing rights from mortgage servicing rights carried at lower of amortized cost or fair value pursuant to a change in accounting principle			0	773,035	$ 0
Balance after reclassification			1,162,369	864,494	$ 64,136
Purchases		0	0	79
Sales		(17)	(100)	0
MSRs resulting from loan sales		837,706	356,755	41,379
Due to changes in valuation inputs used in valuation model	[1]	(262,031)	60,772	(9,762)
Other changes in fair value	[2]	(202,322)	(119,552)	(4,373)
Change in fair value, Total		(464,353)	(58,780)	(14,135)
Balance at end of year		1,535,705	1,162,369	$ 91,459
Fair value of mortgage servicing rights pledged to secure Assets sold under agreements to repurchase and Notes payable		$ 1,510,651	$ 1,139,582
[1]	Primarily reflects changes in pricing spread (discount rate) and prepayment speed inputs, primarily due to changes in market interest rates.
[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	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Transfers And Servicing [Abstract]
Contractually-specified servicing fees	$ 295,390	$ 204,663	$ 164,776
Late charges	1,658	974	718
Other	22,441	7,088	5,805
Net mortgage loan servicing fees	$ 319,489	$ 212,725	$ 171,299

Mortgage Servicing Rights - S_3

Mortgage Servicing Rights - Summary of MSRs Carried at Lower of Amortized Cost or Fair Value (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Balance at beginning of year	$ 772,870	$ 606,103
Transfer of mortgage servicing right to mortgage servicing rights carried at fair value pursuant to a change in accounting principle	(772,870)	0
Balance after reclassification	0	606,103
MSRs resulting from mortgage loan sales	0	248,930
Amortization	0	(81,624)
Sales	0	(539)
Balance at end of year	0	772,870
Balance at beginning of year	(19,548)	(13,672)
Reduction pursuant to a change in accounting principle	19,548	0
Balance after reclassification	0	(13,672)
Additions to valuation allowance	0	(5,876)
Balance at end of year	0	(19,548)
MSRs, net	0	753,322
Fair value at beginning of year	$ 772,940	626,334
Fair value at end of year		$ 772,940

Assets Sold Under Agreements _3

Assets Sold Under Agreements to Repurchase - Summary of Financial Information Relating to Assets Sold under Agreements to Repurchase (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets Sold under Agreements to Repurchase [Line Items]
Weighted average interest rate	3.25%	3.25%	2.49%
Average balance	$ 5,600,469,000	$ 3,901,772,000	$ 3,332,084,000
Total interest expense	178,211,000	115,383,000	93,580,000
Maximum daily amount outstanding	8,577,065,000	6,665,118,000	$ 4,242,600,000
Unpaid principal balance	6,649,179,000	4,777,486,000
Assets sold under agreements to repurchase, At year end	$ 6,648,890,000	$ 4,777,027,000
Weighted average interest rate	2.85%	3.38%
Available borrowing capacity, Committed	$ 0	$ 783,415,000
Available borrowing capacity, Uncommitted	2,278,264,000	2,325,246,000
Available borrowing capacity	2,278,264,000	3,108,661,000
Margin deposits placed with counterparties included in Other assets	91,871,000	43,676,000
Real Estate Held for Investment [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets securing agreements to repurchase	0	23,262,000
Assets Sold Under Agreements to Repurchase [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Unamortized debt issuance costs, net	(289,000)	(459,000)
Mortgage Backed Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets securing agreements to repurchase	2,839,633,000	2,610,422,000
Loans Acquired For Sale At Fair Value [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets securing agreements to repurchase	4,070,134,000	1,436,437,000
Loans at Fair Value [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets securing agreements to repurchase	12,390,000	108,693,000
Real estate acquired in settlement of loans [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets securing agreements to repurchase	40,938,000	40,198,000
Mortgage service rights [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets securing agreements to repurchase	1,354,907,000	1,139,582,000
Deposits securing CRT Agreements [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets securing agreements to repurchase	445,194,000	1,146,501,000
CRT Strips [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets securing agreements to repurchase	27,073,000	0
CRT Derivatives [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets securing agreements to repurchase	$ 0	$ 87,976,000

Assets Sold Under Agreements _4

Assets Sold Under Agreements to Repurchase - Summary of Financial Information Relating to Assets Sold under Agreements to Repurchase (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets Sold under Agreements to Repurchase [Line Items]
Maturity date description	The master repurchase agreement expired on August 21, 2019.
Master Repurchase Agreement [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Incentives as a reduction to finance mortgage loans included in interest expense	$ 10.8	$ 19.7	$ 3.1
Maturity date description	The master repurchase agreement expired on August 21, 2019.
Assets Sold Under Agreements to Repurchase [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amortization of debt issuance premiums	$ 4	$ 11.7
Amortization of debt issuance costs			$ 8.3

Assets Sold Under Agreements _5

Assets Sold Under Agreements to Repurchase - Summary of Maturities of Outstanding Advances Under Repurchase Agreements by Maturity Date (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Assets Sold under Agreements to Repurchase [Line Items]
Maturity of repurchase agreements	$ 6,649,179
Weighted average maturity (in months)	1 month 12 days
Within 30 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Maturity of repurchase agreements	$ 3,322,037
Over 30 to 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Maturity of repurchase agreements	3,036,754
Over 90 days to 180 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Maturity of repurchase agreements	290,388
Over 180 days to one year [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Maturity of repurchase agreements	$ 0

Assets Sold Under Agreements _6

Assets Sold Under Agreements to Repurchase - Summary of Assets Sold under Agreements to Repurchase by Counterparty (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
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	$ 283,315
Mortgage acquired for sale Weighted-average repurchase agreement maturity	Mar. 22, 2020
Facility maturity	Aug. 4, 2020
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	$ 227,577
Mortgage acquired for sale Weighted-average repurchase agreement maturity	Mar. 18, 2020
Facility maturity	Apr. 24, 2020
JPMorgan Chase & Co. [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 22,279
Weighted average maturity	Jan. 21, 2020
JPMorgan Chase & Co. [Member] | CRT Agreements [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 88,089
Weighted average maturity	Jan. 31, 2020
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	$ 84,911
Mortgage acquired for sale Weighted-average repurchase agreement maturity	Feb. 18, 2020
Facility maturity	Oct. 9, 2020
Bank of America, N.A. [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 12,078
Weighted average maturity	Jan. 14, 2020
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	$ 43,604
Mortgage acquired for sale Weighted-average repurchase agreement maturity	Jan. 30, 2020
Facility maturity	Mar. 12, 2020
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	$ 6,370
Mortgage acquired for sale Weighted-average repurchase agreement maturity	Mar. 16, 2020
Facility maturity	Jul. 31, 2020
Morgan Stanley [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	$ 41,672
Mortgage acquired for sale Weighted-average repurchase agreement maturity	Mar. 17, 2020
Facility maturity	Aug. 21, 2020
Royal Bank of Canada [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	$ 15,902
Mortgage acquired for sale Weighted-average repurchase agreement maturity	Apr. 13, 2020
Facility maturity	Feb. 28, 2020
Daiwa Capital Markets [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 28,234
Weighted average maturity	Jan. 17, 2020
Mizuho Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 12,214
Weighted average maturity	Jan. 11, 2020
Amherst Pierpont Securities LLC [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 2,404
Weighted average maturity	Feb. 14, 2020

Mortgage Loan Participation P_3

Mortgage Loan Participation Purchase and Sale Agreements - Summary of Mortgage Loan Participation Purchase and Sale Agreements (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
At period end:
Mortgage loan participation purchase and sale agreements, At year end	$ 0	$ 178,639,000
Mortgage Loan Participation Purchase and Sale Agreement [Member]
Mortgage Loan Participation Purchase And Sale Agreement [Line Items]
Weighted-average interest rate	3.53%	3.42%	2.34%
Average balance	$ 40,036,000	$ 64,512,000	$ 61,807,000
Total interest expense	1,570,000	2,422,000	1,593,000
Maximum daily amount outstanding	$ 207,065,000	287,862,000	$ 136,854,000
At period end:
Amount outstanding		178,726,000
Unamortized debt issuance costs		(87,000)
Mortgage loan participation purchase and sale agreements, At year end		$ 178,639,000
Weighted average interest rate		3.77%
Loans acquired for sale pledged to secure mortgage loan participation purchase and sale agreements		$ 185,442,000

Mortgage Loan Participation P_4

Mortgage Loan Participation Purchase and Sale Agreements - Summary of Mortgage Loan Participation Purchase and Sale Agreements (Parenthetical) (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Mortgage Loan Participation Purchase And Sale Agreement [Line Items]
Amortization of debt issuance costs	$ 34,000	$ (9,323,000)	$ 13,769,000
Mortgage Loan Participation Purchase and Sale Agreement [Member]
Mortgage Loan Participation Purchase And Sale Agreement [Line Items]
Amortization of debt issuance costs	$ 158,000	$ 217,000	$ 125,000

Notes Payable - Additional Info

Notes Payable - Additional Information (Detail) - USD ($)	Oct. 16, 2019	Jun. 11, 2019	Mar. 29, 2019	Apr. 25, 2018	Dec. 31, 2019	Feb. 01, 2018	Mar. 24, 2017
Secured Term Notes [Member]
Short-term Debt [Line Items]
Aggregate loan amount	$ 375,000,000	$ 638,000,000	$ 295,700,000	$ 450,000,000
Debt instrument initial payment date	Nov. 27, 2019	Jun. 27, 2019	Apr. 29, 2019
Maturity date of debt instrument	Oct. 27, 2022	May 29, 2023	Mar. 27, 2022	Apr. 25, 2023
Debt instrument extended maturity date subject to term note indenture	Oct. 29, 2024	Jun. 28, 2025	Mar. 29, 2024	Apr. 25, 2025
Debt instrument payable start date				2018-05
Loan and Security Agreement with Credit Suisse First Boston Mortgage Capital LLC [Member]
Short-term Debt [Line Items]
Maturity date of debt instrument					Feb. 1, 2020
Loan and Security Agreement with Credit Suisse First Boston Mortgage Capital LLC [Member] | Maximum [Member]
Short-term Debt [Line Items]
Aggregate loan amount						$ 175,000,000
Loan and Security Agreement with Barclays Bank PLC [Member]
Short-term Debt [Line Items]
Maturity date of debt instrument					Feb. 1, 2018
Loan and Security Agreement with Barclays Bank PLC [Member] | Maximum [Member]
Short-term Debt [Line Items]
Aggregate loan amount							$ 170,000,000
Fixed-rate assets and LIBOR- indexed repurchase agreements [Member] | Secured Term Notes [Member]
Short-term Debt [Line Items]
Debt Instrument, Description of Variable Rate Basis	one-month	one-month	one-month		one-month
Debt instrument interest rate spread	2.70%	2.75%	2.00%	2.35%

Notes Payable - Summary of Fina

Notes Payable - Summary of Financial Information Relating to Note Payable (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Carrying value:
Amount outstanding	$ 1,702,262,000	$ 450,000,000
Balance	1,696,295,000	445,573,000
Assets securing notes payable:
MSRs (1)	1,510,651,000	1,139,582,000
Deposits securing CRT arrangements	1,524,590,000	0
Derivative assets	$ 142,183,000	$ 87,976,000
Notes Payable [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	4.70%	4.68%	5.71%
Average balance	$ 1,101,501,000	$ 300,035,000	$ 145,638,000
Total interest expense	53,968,000	14,623,000	12,634,000
Maximum daily amount outstanding	1,742,227,000	450,000,000	$ 275,106,000
Carrying value:
Unamortized debt issuance costs	$ (5,967,000)	$ (4,427,000)
Weighted average interest rate	4.30%	4.86%
Assets securing notes payable:
Derivative assets	$ 115,110,000	$ 0

Notes Payable - Summary of Fi_2

Notes Payable - Summary of Financial Information Relating to Note Payable (Parenthetical) (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Amortization of debt issuance costs	$ 34,000	$ (9,323,000)	$ 13,769,000
Notes Payable [Member]
Debt Instrument [Line Items]
Amortization of debt issuance costs	$ 2,200,000	$ 681,000	$ 4,200,000

Exchangeable Senior Notes - Add

Exchangeable Senior Notes - Additional Information (Detail)	Nov. 04, 2019USD ($)	Apr. 30, 2013USD ($)	Dec. 31, 2019USD ($)$ / shares
Exchangeable Senior Notes due November 1, 2024 [Member]
Debt Instrument [Line Items]
Issuance of debt through private offering	$ 210,000,000
Percentage of interest on debt	5.50%
Principal amount of the exchangeable notes	$ 1,000
Maturity date of debt instrument	Nov. 1, 2024
Exchangeable Senior Notes due November 1, 2024 [Member] | Initial Exchangeable Rate [Member]
Debt Instrument [Line Items]
Number of shares exchanged per exchangeable notes	40.1010
Exchangeable Senior Notes due May 1, 2020 [Member]
Debt Instrument [Line Items]
Issuance of debt through private offering		$ 250,000,000
Percentage of interest on debt		5.375%
Number of shares exchanged per exchangeable notes			33.8667
Principal amount of the exchangeable notes			$ 1,000
Maturity date of debt instrument			May 1, 2020
Increased in cash dividend | $ / shares			$ 0.57
Exchangeable Senior Notes due May 1, 2020 [Member] | Initial Exchangeable Rate [Member]
Debt Instrument [Line Items]
Number of shares exchanged per exchangeable notes		33.5149

Exchangeable Senior Notes - Sum

Exchangeable Senior Notes - Summary of Financial Information Relating to Exchangeable Senior Notes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Carrying value:
UPB	$ 460,000	$ 250,000
Exchangeable senior notes	443,506	248,350
Convertible Debt [Member]
Debt Instrument [Line Items]
Average balance	279,207	250,000	$ 250,000
Total interest expense	17,037	14,601	$ 14,535
Carrying value:
Unamortized debt issuance costs and conversion option	$ (16,494)	$ (1,650)

Asset-Backed Financing of a V_3

Asset-Backed Financing of a Variable Interest Entity at Fair Value - Summary of Financial Information Relating to Asset-Backed Financing of a VIE at Fair Value (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Variable Interest Entity [Line Items]
Asset-backed financing of a variable interest entity at fair value	$ 243,360	$ 276,499
Variable Interest Entities [Member]
Variable Interest Entity [Line Items]
Asset-backed financing of a variable interest entity at fair value	243,360	276,499
Asset-Backed Financing of the VIE at Fair Value [Member] | Variable Interest Entities [Member]
Variable Interest Entity [Line Items]
Asset-backed financing of a variable interest entity at fair value	243,360	276,499
UPB	239,169	281,922
Asset-Backed Financing of the VIE at Fair Value [Member] | Variable Interest Entities [Member] | Asset Backed Secured Financing Liability Fair Value [Member]
Variable Interest Entity [Line Items]
Average balance	267,539	288,244	$ 331,409
Total interest expense	$ 11,324	$ 10,821	$ 13,184
Weighted average interest rate	3.46%	3.55%	3.39%
Weighted average interest rate	3.51%	3.51%

Asset-Backed Financing of a V_4

Asset-Backed Financing of a Variable Interest Entity at Fair Value - Summary of Financial Information Relating to Asset-Backed Financing of a VIE at Fair Value (Parenthetical) (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Asset-Backed Financing of the VIE at Fair Value [Member] | Variable Interest Entities [Member] | Asset Backed Secured Financing Liability Fair Value [Member]
Variable Interest Entity [Line Items]
Debt issuance costs	$ 2,100,000	$ 577,000	$ 1,800,000

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	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Mortgage Banking [Abstract]
Balance, beginning of year	$ 7,514	$ 8,678	$ 15,350
Provision for losses:
Pursuant to loan sales	3,778	2,531	3,147
Reduction in liability due to change in estimate	(3,550)	(3,707)	(9,679)
(Losses incurred) recoveries, net	(128)	12	(140)
Balance, end of year	7,614	7,514	8,678
UPB of loans subject to representations and warranties at end of year	$ 122,163,186	$ 90,427,100	$ 71,416,333

Commitments and Contingencies -

Commitments and Contingencies - Company's Outstanding Contractual Commitments (Detail) $ in Thousands	Dec. 31, 2019USD ($)
Commitments to purchase mortgage loans:
Commitments to purchase loans acquired for sale	$ 3,199,680
Face amount of firm commitment to purchase credit risk transfer securities	$ 1,502,203

Shareholders' Equity - Summary

Shareholders' Equity - Summary of Preferred Shares of Beneficial Interest (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
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	$ 2.03	$ 2.03	$ 1.59
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	$ 2	$ 2	$ 0.89

Shareholders' Equity - Summar_2

Shareholders' Equity - Summary of Preferred Shares of Beneficial Interest (Parenthetical) (Detail) - $ / shares	Jul. 05, 2017	Jul. 31, 2017	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
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	$ 0.01
8.00% Series B Preferred Stock [Member]
Class Of Stock [Line Items]
Cumulative dividend, beneficial interest rate	8.00%	5.99%		8.00%
Sale of Stock, Transaction Date				Jul. 31, 2017
Preferred stock, par value		$ 0.01		$ 0.01

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Detail) - USD ($)	Jul. 05, 2017	Jul. 31, 2017	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Mar. 31, 2019	Aug. 31, 2015
Schedule Of Capitalization Equity [Line Items]
Preferred stock, par value				$ 0.01	$ 0.01
Reimbursement paid for every $100 of performance incentive fees earned				$ 10
Performance incentive fees earned				100
Payments of contingent underwriting fees to underwriters				580,000	$ 137,000	$ 61,000
IPO [Member]
Schedule Of Capitalization Equity [Line Items]
Reimbursement paid for every $100 of performance incentive fees earned				20
Performance incentive fees earned				$ 100
Reimbursement agreement expiry date				Feb. 1, 2023
Underwriting fees waived				$ 1,100,000
Management [Member]
Schedule Of Capitalization Equity [Line Items]
Reimbursement of contingent underwriting fee to manager				$ 393,000	$ 68,000	$ 30,000
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
8.125% Series A Preferred Stock [Member]
Schedule Of Capitalization Equity [Line Items]
Issuance of preferred shares, Shares			4,600,000
Cumulative dividend, beneficial interest rate			8.125%	8.125%
Preferred stock, par value			$ 0.01	$ 0.01
Statutory Dividend Payment Restrictions Disclosure				The Company pays quarterly cumulative dividends on the Preferred Shares on the 15th day of each March, June, September and December, provided that if any dividend payment date is not a business day, then the dividend that would otherwise be payable on that dividend payment date may be paid on the following business day.
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]
Issuance of preferred shares, Shares		7,800,000
Cumulative dividend, beneficial interest rate	8.00%	5.99%		8.00%
Preferred stock, par value		$ 0.01		$ 0.01
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 Underwritten Offerings of Common Shares (Detail) - USD ($) $ / shares in Units, $ in Thousands	Dec. 13, 2019	Aug. 08, 2019	May 09, 2019	Feb. 14, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Class Of Stock [Line Items]
Common shares, issued					100,182,227	60,951,444
Net proceeds					$ 839,682	$ 0	$ 0
Purchase Agreement
Class Of Stock [Line Items]
Common shares, issued	9,200,000	9,200,000	8,127,000	7,000,000	33,527,000
Average price per share	$ 22.10	$ 21.75	$ 21.15	$ 20.64	$ 21.47
Gross proceeds	$ 203,320	$ 200,100	$ 171,877	$ 144,480	$ 719,777
Net proceeds	$ 200,904	$ 197,773	$ 169,605	$ 142,470	$ 710,752

Shareholders' Equity - Summar_4

Shareholders' Equity - Summary of Activities under ATM Equity Offering Program (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Class Of Stock [Line Items]
Net proceeds					$ 839,682	$ 0	$ 0
Equity Distribution Agreement [Member]
Class Of Stock [Line Items]
Average price per share	$ 22.32	$ 22.17	$ 21.68	$ 20.76	$ 21.95
Gross proceeds	$ 14,217	$ 56,256	$ 44,844	$ 4,588	$ 119,905
Net proceeds	$ 14,074	$ 55,694	$ 44,395	$ 4,542	$ 118,705
Common Shares [Member]
Class Of Stock [Line Items]
Number of common shares					38,990
Common Shares [Member] | Equity Distribution Agreement [Member]
Class Of Stock [Line Items]
Number of common shares	637	2,537	2,068	221	5,463

Shareholders' Equity - Summar_5

Shareholders' Equity - Summary of Share Repurchase Activity (Detail) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Equity [Abstract]
Common shares repurchased	671	5,647	7,368	1,045
Cumulative shares repurchased	14,731
Cost of common shares repurchased	$ 10,719	$ 91,198	$ 98,370	$ 16,338
Cumulative cost of shares repurchased	$ 216,625

Net Gain on Investments - Summa

Net Gain on Investments - Summary of Net Gain on Investments (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
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	$ 931,733	$ 402,359	$ 287,618
Net gain (loss) on investments	263,318	81,926	96,384
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	77,283	(11,262)	5,498
CRT arrangements	110,676	92,943	123,728
Firm commitment to purchase CRT securities	60,943	7,399	0
Asset-backed financing of a VIE at fair value	(7,553)	9,610	(3,426)
Hedging derivatives	28,785	(4,152)	(18,468)
Net gain (loss) on investments	270,848	70,842	110,914
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 gain (loss) on investments	(7,530)	11,084	(14,530)
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	7,883	(8,499)	4,266
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	$ (7,169)	$ (15,197)	$ (684)

Net Gain on Loans Acquired fo_3

Net Gain on Loans Acquired for Sale - Summary of Net Gain on Mortgage Loans Acquired for Sale (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Provision for losses relating to representations and warranties provided in mortgage loan sales:
Pursuant to loans sales	$ (3,778)	$ (2,531)	$ (3,147)
Change in fair value of loans and derivatives held at end of year:
Net cash of gain on mortgage loans acquired for sale	931,733	402,359	287,618
Net gain on loans acquired for sale	170,164	59,185	74,516
PennyMac Financial Services, Inc. [Member]
Change in fair value of loans and derivatives held at end of year:
Net gain on loans acquired for sale	14,381	10,925	12,084
Nonaffiliates [Member]
Cash loss:
Loans	(687,317)	(363,271)	(209,898)
Hedging activities	(88,633)	9,172	(15,288)
Cash gain, net of effects of cash hedging, on sale of mortgage loans acquired for sale	(775,950)	(354,099)	(225,186)
Non-cash gain:
Recognition of fair value of firm commitment to purchase CRT securities	99,305	30,595	0
Receipt of MSRs in mortgage loan sale transactions	837,706	356,755	290,309
Provision for losses relating to representations and warranties provided in mortgage loan sales:
Pursuant to loans sales	(3,778)	(2,531)	(3,147)
Reduction in liability due to change in estimate	3,550	3,707	9,679
Provision for losses relating to representations and warranties	(228)	1,176	6,532
Change in fair value of loans and derivatives held at end of year:
IRLCs	(834)	7,356	855
Loans	(1,765)	(9,685)	5,879
Hedging derivatives	(2,451)	16,162	(15,957)
Total non cash portion of gain on mortgage loans acquired for sale	(5,050)	13,833	(9,223)
Net gain on loans acquired for sale	$ 155,783	$ 48,260	$ 62,432

Net Loan Servicing Fees - Summa

Net Loan Servicing Fees - Summary of Net Loan Servicing Fees (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Components of Net Servicing Fee Income [Line Items]
Contractually specified		$ 319,489	$ 212,725	$ 171,299
Effect of MSRs:
Realization of cashflows	[1]	(202,322)	(119,552)	(4,373)
Market changes	[2]	(262,031)	60,772	(9,762)
Change in fair value, Total		(464,353)	(58,780)	(14,135)
Amortization			0	(81,624)
Increase in impairment valuation allowance			0	(5,876)
Total Effect of MSRs		(383,731)	(94,330)	(103,487)
Net servicing fees from non-affiliates		(58,918)	120,587	69,240
Average servicing portfolio		110,075,179	80,500,212	63,836,843
PennyMac Financial Services, Inc. [Member]
Effect of MSRs:
From PFSI—MSR recapture income		5,324	2,192	1,428
Nonaffiliates [Member]
Components of Net Servicing Fee Income [Line Items]
Contractually specified		295,390	204,663	164,776
Other		24,099	8,062	6,523
Effect of MSRs:
Realization of cashflows		(202,322)	(119,552)	(9,762)
Market changes		(262,031)	60,772	(4,373)
Change in fair value, Total		(464,353)	(58,780)	(14,135)
Amortization		0	0	(81,624)
Increase in impairment valuation allowance		0	0	(5,876)
Gain on sale		0	0	660
Total Effect of MSRs		(383,731)	(94,330)	(103,487)
Net servicing fees from non-affiliates		(64,242)	118,395	67,812
Nonaffiliates [Member] | Mortgage service rights [Member]
Effect of MSRs:
Gain (losses) on hedging derivatives, net		$ 80,622	$ (35,550)	$ (2,512)
[1]	Represents changes due to realization of expected cash flows.
[2]	Primarily reflects changes in pricing spread (discount rate) and prepayment speed inputs, primarily due to changes in market interest rates.

Net Interest Income - Summary o

Net Interest Income - Summary of Net Interest Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest income:
Interest income	$ 317,885	$ 222,772	$ 195,176
Interest expense:
Assets sold under agreements to repurchase	178,211	115,383	93,580
Interest expense, total	297,446	175,171	151,371
Net interest income	20,439	47,601	43,805
Exchangeable Notes [Member]
Interest expense:
Total interest expense	17,037	14,601	14,535
PennyMac Financial Services, Inc. [Member]
Interest income:
Interest income	10,291	15,138	16,951
Interest expense:
Assets sold under agreements to repurchase	6,302	7,462	8,038
Nonaffiliates [Member]
Interest income:
Cash and short-term investments	4,559	852	576
Mortgage-backed securities	78,450	55,487	29,438
Loans acquired for sale at fair value	121,387	75,610	53,164
Distressed	3,848	21,666	63,613
Deposits securing CRT arrangements	34,229	15,441	4,291
Placement fees relating to custodial funds	52,587	26,065	12,517
Other	800	700	201
Interest income	307,594	207,634	178,225
Interest expense:
Assets sold under agreements to repurchase	178,211	115,383	93,580
Mortgage loan participation purchase and sale agreements	1,570	2,422	1,593
Notes payable	53,968	14,623	12,634
Asset-backed financings of a VIE at fair value	11,324	10,821	13,184
Interest shortfall on repayments of loans serviced for Agency securitizations	25,776	7,324	5,928
Interest on loan impound deposits	3,258	2,535	1,879
Interest expense, total	291,144	167,709	143,333
Nonaffiliates [Member] | Exchangeable Notes [Member]
Interest expense:
Total interest expense	17,037	14,601	14,535
Nonaffiliates [Member] | Variable Interest Entities [Member]
Interest income:
Loans at fair value	$ 11,734	$ 11,813	$ 14,425

Net Interest Income - Summary_2

Net Interest Income - Summary of Net Interest Income (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule Of Investment Income Reported Amounts By Category [Line Items]
Maturity date description	The master repurchase agreement expired on August 21, 2019.
Master Repurchase Agreement [Member]
Schedule Of Investment Income Reported Amounts By Category [Line Items]
Incentives as a reduction to finance mortgage loans included in interest expense	$ 10.8	$ 19.7	$ 3.1
Repurchase agreement expiration date	Aug. 21, 2019
Maturity date description	The master repurchase agreement expired on August 21, 2019.

Share-Based Compensation Plan_2

Share-Based Compensation Plans - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2019
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 Plan_3

Share-Based Compensation Plans - Summary of Share-Based Compensation Activity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total share units granted	212,000	245,000	262,000
Total grant date value of share units	$ 4,358	$ 3,823	$ 3,991
Total share units vested	345,000	288,000	284,000
Total share units forfeited	1,000	2,000	13,000
Compensation expense relating to share-based grants	$ 5,530	$ 5,318	$ 4,904
Restricted Shares Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total share units granted	96,000	129,000	136,000
Total grant date value of share units	$ 1,978	$ 2,281	$ 2,316
Total share units vested	227,000	261,000	284,000
Total share units forfeited	0	2,000	13,000
Performance Shares Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total share units granted	116,000	116,000	126,000
Total grant date value of share units	$ 2,380	$ 1,542	$ 1,675
Total share units vested	118,000	27,000	0
Total share units forfeited	1,000	0	0

Share-Based Compensation Plan_4

Share-Based Compensation Plans - Summary of Share-Based Compensation Activity (Parenthetical) (Detail) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total share units vested	345,000	288,000	284,000
Performance Shares Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share vested due to exceeding performance goal	141,000
Vesting percentage	119.00%
Total share units vested	118,000	27,000	0

Share-Based Compensation Plan_5

Share-Based Compensation Plans - Summary of Restricted Share Units and Performance Share Units Expected to Vest (Detail) shares in Thousands	12 Months Ended
	Dec. 31, 2019$ / sharesshares
Restricted Share Units [Member]
Shares expected to vest:
Number of units (in thousands) | shares	229
Grant date average fair value per unit | $ / shares	$ 19.01
Average remaining vesting period (months)	8 months
Performance Share Units [Member]
Shares expected to vest:
Number of units (in thousands) | shares	234
Grant date average fair value per unit | $ / shares	$ 17.28
Average remaining vesting period (months)	8 months

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax [Line Items]
Percentage of deduction from taxable income			20.00%
Federal corporate tax rate	21.00%	21.00%	35.00%
Tax cuts and jobs act of 2017, change in tax rate, income tax expense (benefit)	$ 0	$ 0	$ 12,992,000
Net operating loss carryforwards	$ 365,400,000	$ 136,800,000
Net operating loss carryforwards, expiration year	2033	2036
Net operating loss carryforwards, maximum percentage of taxable income	80.00%
Deferred tax valuation allowance	$ 13,612,000	$ 0	0
Unrecognized tax benefits	$ 0	$ 0
TRS [Member]
Income Tax [Line Items]
Distribution			$ 20,000,000	$ 0

Income Taxes - Schedule of Tax

Income Taxes - Schedule of Tax Characterization of Distributions (Detail)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Ordinary income	66.00%	49.00%	71.00%
Long term capital gain	0.00%	0.00%	29.00%
Return of capital	34.00%	51.00%	0.00%

Income Taxes - Summary of Compa

Income Taxes - Summary of Company's (Benefit from) Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current (benefit) expense :
Federal	$ (120)	$ 19	$ 251
State	12	6	57
Total current (benefit) expense	(108)	25	308
Deferred (benefit) expense:
Federal	(39,592)	7,587	3,824
State	3,984	(2,422)	2,665
Total deferred (benefit) expense	(35,608)	5,165	6,489
Total (benefit from) provision for income taxes	$ (35,716)	$ 5,190	$ 6,797

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Company's (Benefit from) Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Federal income tax expense at statutory tax rate, Amount	$ 40,035	$ 33,177	$ 43,591
Effect of non-taxable REIT income, Amount	(79,467)	(26,647)	(25,754)
State income taxes, net of federal benefit, Amount	(7,417)	(2,044)	1,687
Effect of federal statutory rate change, Amount	0	0	(12,992)
Valuation allowance, Amount	13,612	0	0
Other, Amount	(2,479)	704	265
Total (benefit from) provision for income taxes	$ (35,716)	$ 5,190	$ 6,797
Federal income tax expense at statutory tax rate, Rate	21.00%	21.00%	35.00%
Effect of non-taxable REIT income, Rate	(41.70%)	(16.90%)	(20.70%)
State income taxes, net of federal benefit, Rate	(3.90%)	(1.30%)	1.40%
Effect of federal statutory rate change, Rate	0.00%	0.00%	(10.40%)
Valuation allowance, Rate	7.00%	0.00%	0.00%
Other, Rate	(1.20%)	0.40%	0.20%
(Benefit from) provision for income taxes	(18.80%)	3.20%	5.50%

Income Taxes - Components of (B

Income Taxes - Components of (Benefit from) Provision for Deferred Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Real estate valuation loss	$ 1,140	$ 1,565	$ 3,476
Mortgage servicing rights	(212)	4,797	15,516
Net operating loss carryforward	(56,339)	(1,109)	4,333
Liability for losses under representations and warranties	111	405	2,652
Excess interest expense disallowance	4,667	234	(7,304)
Effect of federal statutory rate change, Amount	0	0	(12,992)
Other	1,413	(727)	808
Valuation allowance	13,612	0	0
Total (benefit from) provision for deferred income taxes	$ (35,608)	$ 5,165	$ 6,489

Income Taxes - Components of In

Income Taxes - Components of Income Taxes Payable (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Taxes currently receivable	$ (259)	$ (1,160)
Deferred income taxes payable	2,078	37,686
Income taxes payable	$ 1,819	$ 36,526

Income Taxes - Summary of Defer

Income Taxes - Summary of Deferred Income Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred income tax assets:
Net operating loss carryforward	$ 97,236	$ 40,897
Excess interest expense disallowance	15,234	19,901
REO valuation loss	1,438	2,578
Liability for losses under representations and warranties	1,900	2,011
Valuation allowance	(13,612)	0	$ 0
Other	162	1,576
Gross deferred tax assets	102,358	66,962
Deferred income tax liabilities:
Mortgage servicing rights	104,436	104,648
Other	0	0
Gross deferred tax liabilities	104,436	104,648
Net deferred income tax liability	$ 2,078	$ 37,686

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								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net income	$ 58,597	$ 70,000	$ 44,233	$ 53,527	$ 41,625	$ 46,562	$ 36,425	$ 28,186	$ 226,357	$ 152,798	$ 117,749
Dividends on preferred shares									(24,938)	(24,938)	(15,267)
Effect of participating securities—share-based compensation awards									(566)	(750)	(991)
Net income attributable to common shareholders									200,853	127,110	101,491
Net income attributable to common shareholders									200,853	127,110	101,491
Interest on Exchangeable Notes, net of income taxes									11,827	10,637	8,757
Diluted net income attributable to common shareholders									$ 212,680	$ 137,747	$ 110,248
Weighted average basic shares outstanding									78,990	60,898	66,144
Dilutive securities:
Shares issuable under share-based compensation plan									254	0	0
Shares issuable pursuant to exchange of the Exchangeable Notes									8,467	8,467	8,467
Diluted weighted average number of shares outstanding									87,711	69,365	74,611
Basic earnings per share	$ 0.56	$ 0.75	$ 0.52	$ 0.73	$ 0.58	$ 0.66	$ 0.49	$ 0.36	$ 2.54	$ 2.09	$ 1.53
Diluted earnings per share	$ 0.55	$ 0.71	$ 0.50	$ 0.68	$ 0.55	$ 0.62	$ 0.47	$ 0.35	$ 2.42	$ 1.99	$ 1.48

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	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
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	152	252	157

Segments - Additional Informati

Segments - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2019Segment
Segment Reporting [Abstract]
Number of business segments	4

Segments - Financial Highlights

Segments - Financial Highlights by Operating Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Net investment income:
Net gain on investments	$ 263,318	$ 81,926	$ 96,384
Net gain on loans acquired for sale	170,164	59,185	74,516
Net loan servicing fees	(58,918)	120,587	69,240
Net interest income (expense):
Interest income	317,885	222,772	195,176
Interest expense	(297,446)	(175,171)	(151,371)
Net interest income	20,439	47,601	43,805
Other	93,812	41,768	33,995
Net investment income	488,815	351,067	317,940
Expenses:
Loan fulfillment and servicing fees payable to PFSI	209,407	123,395	123,423
Management fees	36,492	24,465	22,584
Other	52,275	45,219	47,387
Total expenses	298,174	193,079	193,394
Pre-tax income (loss)	190,641	157,988	124,546
Total assets at year end	11,771,351	7,813,361	5,604,933	$ 10,744,609	$ 9,465,789	$ 7,555,987	$ 7,267,578	$ 6,676,849	$ 5,790,486
Credit Sensitive Strategies [Member]
Net investment income:
Net gain on investments	164,413	84,943	123,774
Net gain on loans acquired for sale	51,014	30,740	208
Net loan servicing fees	0	29	134
Net interest income (expense):
Interest income	39,343	37,786	69,008
Interest expense	(67,412)	(41,523)	(53,434)
Net interest income	(28,069)	(3,737)	15,574
Other	4,507	(1,704)	(6,290)
Net investment income	191,865	110,271	133,400
Expenses:
Loan fulfillment and servicing fees payable to PFSI	2,213	7,561	15,611
Management fees	0	0	0
Other	7,476	15,459	15,575
Total expenses	9,689	23,020	31,186
Pre-tax income (loss)	182,176	87,251	102,214
Total assets at year end	2,364,749	1,602,776	1,791,447
Interest Rate Sensitive Strategies [Member]
Net investment income:
Net gain on investments	98,905	(3,017)	(27,390)
Net gain on loans acquired for sale		0	0
Net loan servicing fees	(58,918)	120,558	69,106
Net interest income (expense):
Interest income	155,176	108,366	72,870
Interest expense	(144,513)	(92,294)	(62,809)
Net interest income	10,663	16,072	10,061
Other	0	0	0
Net investment income	50,650	133,613	51,777
Expenses:
Loan fulfillment and servicing fees payable to PFSI	46,584	34,484	27,446
Management fees	0	0	0
Other	2,918	697	1,648
Total expenses	49,502	35,181	29,094
Pre-tax income (loss)	1,148	98,432	22,683
Total assets at year end	4,993,840	4,373,488	2,414,423
Correspondent production [Member]
Net investment income:
Net gain on investments	0	0	0
Net gain on loans acquired for sale	119,150	28,445	74,308
Net loan servicing fees	0	0	0
Net interest income (expense):
Interest income	120,974	75,068	52,522
Interest expense	(85,521)	(41,354)	(35,128)
Net interest income	35,453	33,714	17,394
Other	88,159	43,447	40,279
Net investment income	242,762	105,606	131,981
Expenses:
Loan fulfillment and servicing fees payable to PFSI	160,610	81,350	80,366
Management fees	0	0	0
Other	17,559	7,784	8,677
Total expenses	178,169	89,134	89,043
Pre-tax income (loss)	64,593	16,472	42,938
Total assets at year end	4,216,806	1,698,656	1,302,245
Corporate [Member]
Net investment income:
Net gain on investments	0	0	0
Net gain on loans acquired for sale	0	0	0
Net loan servicing fees	0	0	0
Net interest income (expense):
Interest income	2,392	1,552	776
Interest expense	0	0	0
Net interest income	2,392	1,552	776
Other	1,146	25	6
Net investment income	3,538	1,577	782
Expenses:
Loan fulfillment and servicing fees payable to PFSI	0	0	0
Management fees	36,492	24,465	22,584
Other	24,322	21,279	21,487
Total expenses	60,814	45,744	44,071
Pre-tax income (loss)	(57,276)	(44,167)	(43,289)
Total assets at year end	$ 195,956	$ 138,441	$ 96,818

Segments - Financial Highligh_2

Segments - Financial Highlights by Operating Segment (Parenthetical) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2019USD ($)
Correspondent production [Member]
Segment Reporting Information [Line Items]
Initial firm commitment recognized gain allocated to net gain on loans acquired for sale	$ 49

Selected Quarterly Results - Se

Selected Quarterly Results - Selected Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Net investment income	$ 155,036	$ 130,760	$ 96,401	$ 106,618	$ 83,902	$ 108,501	$ 82,991	$ 75,673
Net income	$ 58,597	$ 70,000	$ 44,233	$ 53,527	$ 41,625	$ 46,562	$ 36,425	$ 28,186	$ 226,357	$ 152,798	$ 117,749
Earnings per share:
Basic	$ 0.56	$ 0.75	$ 0.52	$ 0.73	$ 0.58	$ 0.66	$ 0.49	$ 0.36	$ 2.54	$ 2.09	$ 1.53
Diluted	0.55	0.71	0.50	0.68	0.55	0.62	0.47	0.35	$ 2.42	$ 1.99	$ 1.48
Cash dividends declared per share	$ 0.47	$ 0.47	$ 0.47	$ 0.47	$ 0.47	$ 0.47	$ 0.47	$ 0.47
Mortgage-backed securities	$ 2,839,633	$ 2,325,010	$ 2,600,357	$ 2,589,106	$ 2,610,422	$ 2,126,507	$ 1,698,322	$ 1,436,456	$ 2,839,633	$ 2,610,422
Loans	4,419,218	4,237,895	2,835,837	1,833,735	2,052,262	2,582,600	2,539,963	1,895,023	4,419,218	2,052,262
Excess servicing spread	178,586	183,141	194,156	205,081	216,110	223,275	229,470	236,002	178,586	216,110
Derivative assets	202,318	274,444	258,782	188,710	167,165	143,577	133,239	122,518	202,318	167,165
Real estate	65,583	79,201	97,808	114,521	128,791	141,576	155,702	187,296	65,583	128,791
Deposits securing credit risk transfer arrangements	1,969,784	2,044,250	2,060,612	1,137,283	1,146,501	662,624	651,204	622,330	1,969,784	1,146,501
Mortgage servicing rights	1,535,705	1,162,714	1,126,427	1,156,908	1,162,369	1,109,741	1,010,507	957,013	1,535,705	1,162,369
Other assets	560,524	437,954	291,810	330,643	329,741	277,678	258,442	333,848	560,524	329,741
Total assets	11,771,351	10,744,609	9,465,789	7,555,987	7,813,361	7,267,578	6,676,849	5,790,486	11,771,351	7,813,361	$ 5,604,933
Short-term debt	7,005,986	6,713,154	5,483,267	4,378,900	5,081,691	4,452,670	3,630,843	3,366,181	7,005,986	5,081,691
Long-term debt	2,159,286	1,646,349	1,915,465	1,295,949	1,011,433	1,086,841	1,363,886	737,289	2,159,286	1,011,433
Other liabilities	155,164	165,495	123,123	153,549	154,105	169,504	136,633	144,758	155,164	154,105
Total liabilities	9,320,436	8,524,998	7,521,855	5,828,398	6,247,229	5,709,015	5,131,362	4,248,228	9,320,436	6,247,229
Shareholders' equity	2,450,915	2,219,611	1,943,934	1,727,589	1,566,132	1,558,563	1,545,487	1,542,258	2,450,915	1,566,132	$ 1,544,585	$ 1,351,114
Total liabilities and shareholders' equity	$ 11,771,351	$ 10,744,609	$ 9,465,789	$ 7,555,987	$ 7,813,361	$ 7,267,578	$ 6,676,849	$ 5,790,486	$ 11,771,351	$ 7,813,361

Supplemental Cash Flow Inform_3

Supplemental Cash Flow Information - Summary of Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Payments:
Income tax, net	$ (1,009)	$ 1,333	$ (2,354)
Interest	298,591	170,435	152,441
Cumulative effect on accumulated deficit of conversion to fair value accounting for mortgage servicing rights	0	(14,361)	0
Non-cash investing activities:
Transfer of loans and advances to real estate acquired in settlement of loans	23,672	32,578	87,202
Transfer of real estate acquired in settlement of mortgage loans to real estate held for investment	0	5,183	16,530
Transfer from real estate held for investment to real estate acquired in settlement of loans	30,432	3,401	0
Receipt of mortgage servicing rights as proceeds from sales of loans at fair value	837,706	356,755	290,309
Receipt of excess servicing spread pursuant to recapture agreement with PennyMac Financial Services, Inc.	1,757	2,688	5,244
Capitalization of servicing advances pursuant to mortgage loan modifications	1,340	5,481	18,923
Transfer of firm commitment to purchase CRT securities to CRT strips	56,804	0	0
Non-cash financing activities:
Dividends declared, not paid	$ 47,193	$ 28,816	$ 29,145

Regulatory Capital and Liquid_3

Regulatory Capital and Liquidity Requirements - Additional Information (Detail)	Dec. 31, 2019USD ($)
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]
Minimum net worth amount	$ 2,500,000
Basis point	0.25%
Unpaid Principal Balance [Member]
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]
Basis point	0.035%
Nonperforming mortgage loans [Member]
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]
Basis point	2.00%
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] - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Capital Requirements By Agencies [Line Items]
Net Worth, Actual	$ 627,144	$ 528,506
Net Worth, Required	$ 341,009	$ 238,915
Tangible Net Worth / Total Assets Ratio, Actual	8.00%	11.00%
Tangible Net Worth / Total Assets Ratio, Required	6.00%	6.00%
Liquidity, Actual	$ 128,806	$ 58,144
Liquidity, Required	$ 44,970	$ 31,678

Parent Company Information - Su

Parent Company Information - Summary of Financial Covenants that Include a Minimum Tangible Net Worth (Detail)	Dec. 31, 2019USD ($)
Debt covenant requirement	$ 2,500,000
PennyMac Mortgage Investment Trust [Member]
Debt covenant requirement	860,000,000
Calculated balance	2,450,915,000	[1]
Operating Partnership [Member]
Debt covenant requirement	860,000,000
Calculated balance	2,490,553,000	[1]
PennyMac Holdings, LLC [Member]
Debt covenant requirement	250,000,000
Calculated balance	730,914,000	[1]
PennyMac Corp. [Member]
Debt covenant requirement	150,000,000
Calculated balance	$ 627,004,000	[1]
[1]	Calculated in accordance with the lenders’ requirements

Parent Company Information - Co

Parent Company Information - Condensed Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
ASSETS
Short-term investment	$ 90,836				$ 74,850
Other assets	204,388				85,309
Total assets	11,771,351	$ 10,744,609	$ 9,465,789	$ 7,555,987	7,813,361	$ 7,267,578	$ 6,676,849	$ 5,790,486	$ 5,604,933
Liabilities
Accounts payable and accrued liabilities	91,149				70,687
Total liabilities	9,320,436	8,524,998	7,521,855	5,828,398	6,247,229	5,709,015	5,131,362	4,248,228
Shareholders' equity	2,450,915	2,219,611	1,943,934	1,727,589	1,566,132	1,558,563	1,545,487	1,542,258	$ 1,544,585	$ 1,351,114
Total liabilities and shareholders’ equity	11,771,351	$ 10,744,609	$ 9,465,789	$ 7,555,987	7,813,361	$ 7,267,578	$ 6,676,849	$ 5,790,486
PennyMac Mortgage Investment Trust [Member]
ASSETS
Short-term investment	2,819				714
Investments in subsidiaries	2,501,015				1,599,298
Due from subsidiaries	469				86
Other assets	595				647
Total assets	2,504,898				1,600,745
Liabilities
Dividends payable	47,193				28,680
Accounts payable and accrued liabilities	1,564				2,338
Due to affiliates	399				888
Due to subsidiaries	1				27
Total liabilities	49,157				31,933
Shareholders' equity	2,455,741				1,568,812
Total liabilities and shareholders’ equity	$ 2,504,898				$ 1,600,745

Parent Company Information - _2

Parent Company Information - Condensed Statements of Income (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net investment income:
Other									$ 5,044	$ 7,233	$ 8,766
Total income	$ 155,036	$ 130,760	$ 96,401	$ 106,618	$ 83,902	$ 108,501	$ 82,991	$ 75,673
Expenses
Intercompany interest									297,446	175,171	151,371
Other									15,020	15,839	17,658
Total expenses									298,174	193,079	193,394
Income before provision for income taxes and equity in undistributed earnings in subsidiaries									190,641	157,988	124,546
(Benefit from) provision for income taxes									(35,716)	5,190	6,797
Net income	$ 58,597	$ 70,000	$ 44,233	$ 53,527	$ 41,625	$ 46,562	$ 36,425	$ 28,186	226,357	152,798	117,749
PennyMac Mortgage Investment Trust [Member]
Net investment income:
Dividends from subsidiaries									165,451	221,469	177,571
Intercompany interest									34	8	7
Other									2,389	1,250	1,256
Total income									167,874	222,727	178,834
Expenses
Intercompany interest									27	414	378
Other									3	0	0
Total expenses									30	414	378
Income before provision for income taxes and equity in undistributed earnings in subsidiaries									167,844	222,313	178,456
(Benefit from) provision for income taxes									(109)	24	308
Income before equity in undistributed earnings of subsidiaries									167,953	222,289	178,148
Equity in undistributed earnings (distributions in excess of earnings) of subsidiaries									60,937	(71,180)	(60,655)
Net income									$ 228,890	$ 151,109	$ 117,493

Parent Company Information - _3

Parent Company Information - Condensed Statements of Cash Flows (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net income	$ 58,597	$ 70,000	$ 44,233	$ 53,527	$ 41,625	$ 46,562	$ 36,425	$ 28,186	$ 226,357	$ 152,798	$ 117,749
Decrease (increase) in other assets									102,215	(23,482)	8,822
(Decrease) increase in accounts payable and accrued liabilities									3,613	6,400	(40,435)
Increase in due from affiliates									1,286	(26)	2,514
Increase in due to affiliates									14,571	6,345	10,656
Net cash (used in) provided by operating activities									(2,985,074)	(573,752)	223,125
Cash flows from investing activities:
Net (increase) decrease in short-term investments									(15,986)	(56,452)	103,690
Net cash (used in) provided by investing activities									(704,677)	(1,424,292)	681,681
Cash flows from financing activities:
Proceeds from issuance of common shares									839,682	0	0
Payment of vested share-based compensation withholdings									(2,600)	0	0
Payment of dividends to preferred shareholders									(24,944)	(24,944)	(14,066)
Payment of dividends to common shareholders									(141,001)	(115,596)	(126,135)
Repurchase of common shares									0	(10,719)	(91,198)
Issuance of preferred shares									0	0	310,000
Payment of issuance costs related to preferred shares									0	0	(10,293)
Net cash provided by (used in) financing activities									3,733,962	1,980,242	(861,635)
Net increase (decrease) in cash									44,211	(17,802)	43,171
Cash at beginning of year				59,845				77,647	59,845	77,647	34,476
Cash at end of year	104,056				59,845				104,056	59,845	77,647
Non-cash financing activities:
Dividends payable	47,193				28,816				47,193	28,816	29,145
PennyMac Mortgage Investment Trust [Member]
Cash flows from operating activities:
Net income									228,890	151,109	117,493
(Distributions in excess of earnings, not yet distributed) Equity in undistributed earnings of subsidiaries									(60,937)	71,180	60,655
Decrease in due from affiliates									261	490	620
Decrease (increase) in other assets									52	(58)	21
(Decrease) increase in accounts payable and accrued liabilities									(697)	(3,320)	2,892
Increase in due from affiliates									(489)	(185)	(58)
Increase in due to affiliates									33	84	35
Net cash (used in) provided by operating activities									167,113	219,300	181,658
Cash flows from investing activities:
Increase in investment in subsidiaries									(825,920)	0	(299,919)
Net (increase) decrease in short-term investments									(2,105)	1,159	(838)
Net cash (used in) provided by investing activities									(828,025)	1,159	(300,757)
Cash flows from financing activities:
Net (decrease) increase in intercompany unsecured note payable									0	(69,200)	50,791
Proceeds from issuance of common shares									839,682	0	0
Payment of issuance costs related to common shares									(10,225)	0	0
Payment of vested share-based compensation withholdings									(2,600)	0	0
Payment of dividends to preferred shareholders									(24,944)	(24,944)	(14,066)
Payment of dividends to common shareholders									(141,001)	(115,596)	(126,135)
Repurchase of common shares									0	(10,719)	(91,198)
Issuance of preferred shares									0	0	310,000
Payment of issuance costs related to preferred shares									0	0	(10,293)
Net cash provided by (used in) financing activities									660,912	(220,459)	119,099
Net increase (decrease) in cash									0	0	0
Cash at beginning of year				$ 0				$ 0	0	0	0
Cash at end of year	0				0				0	0	0
Non-cash investing activities:
Investment in subsidiary pursuant to share based compensation plan									5,529	5,314	4,902
Non-cash financing activities:
Investment in subsidiary pursuant to share based compensation plan									5,529	5,314	4,902
Dividends payable	$ 47,193				$ 28,816				$ 47,193	$ 28,816	$ 31,655

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) - Secured Term Notes [Member] - USD ($) $ in Millions	Feb. 21, 2020	Oct. 16, 2019	Jun. 11, 2019	Mar. 29, 2019	Apr. 25, 2018	Dec. 31, 2019
Subsequent Event [Line Items]
Aggregate loan amount		$ 375	$ 638	$ 295.7	$ 450
Debt instrument initial payment date		Nov. 27, 2019	Jun. 27, 2019	Apr. 29, 2019
Maturity date of debt instrument		Oct. 27, 2022	May 29, 2023	Mar. 27, 2022	Apr. 25, 2023
Debt instrument extended maturity date subject to term note indenture		Oct. 29, 2024	Jun. 28, 2025	Mar. 29, 2024	Apr. 25, 2025
Subsequent Event [Member]
Subsequent Event [Line Items]
Aggregate loan amount	$ 350
Debt instrument initial payment date	Mar. 27, 2020
Maturity date of debt instrument	Feb. 28, 2023
Debt instrument extended maturity date subject to term note indenture	Feb. 28, 2025
One-Month LIBOR [Member]
Subsequent Event [Line Items]
Debt Instrument, Description of Variable Rate Basis		one-month	one-month	one-month		one-month
Debt instrument interest rate spread		2.70%	2.75%	2.00%	2.35%
One-Month LIBOR [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Debt Instrument, Description of Variable Rate Basis	one-month LIBOR
Debt instrument interest rate spread	2.35%