PennyMac Mortgage Investment Trust (PMT) 10-Q 7 May 18 2018 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	May 04, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
Trading Symbol	PMT
Entity Registrant Name	PennyMac Mortgage Investment Trust
Entity Central Index Key	1,464,423
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		60,882,954

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
ASSETS
Cash	$ 102,167	$ 77,647
Short-term investments	71,044	18,398
Mortgage-backed securities at fair value pledged to creditors	1,436,456	989,461
Mortgage loans acquired for sale at fair value (includes $1,097,266 and $1,249,277 pledged to creditors, respectively)	1,115,534	1,269,515
Mortgage loans at fair value (includes $770,911 and $1,081,893 pledged to creditors, respectively)	779,489	1,089,473
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	236,002	236,534
Derivative assets (includes $24,423 and $26,058 pledged to creditors, respectively)	122,518	113,881
Real estate acquired in settlement of loans (includes $105,484 and $124,532 pledged to creditors, respectively)	141,506	162,865
Real estate held for investment (includes $31,899 and $31,128 pledged to creditors, respectively)	45,790	44,224
Mortgage servicing rights (includes $957,013 and $91,459 at fair value; $941,686 and $831,892 pledged to creditors)	957,013	844,781
Servicing advances	63,352	77,158
Deposits securing credit risk transfer agreements (includes $392,453 and $400,778 pledged to creditors, respectively)	622,330	588,867
Other	96,972	87,975
Total assets	5,790,486	5,604,933
LIABILITIES
Assets sold under agreements to repurchase	3,408,283	3,180,886
Mortgage loan participation purchase and sale agreements	0	44,488
Asset-backed financing of a variable interest entity at fair value	296,982	307,419
Exchangeable senior notes	247,471	247,186
Interest-only security payable at fair value	7,796	7,070
Derivative liabilities	3,636	1,306
Accounts payable and accrued liabilities	63,196	64,751
Income taxes payable	42,321	27,317
Liability for losses under representations and warranties	8,249	8,678
Total liabilities	4,248,228	4,060,348
Commitments and contingencies — Note 18	0	0
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, 60,882,954 and 61,334,087 common shares, respectively	609	613
Additional paid-in capital	1,281,115	1,290,931
Accumulated deficit	(39,173)	(46,666)
Total shareholders’ equity	1,542,258	1,544,585
Total liabilities and shareholders’ equity	5,790,486	5,604,933
Variable Interest Entities [Member]
ASSETS
Mortgage loans at fair value (includes $770,911 and $1,081,893 pledged to creditors, respectively)	311,102	321,040
Derivative assets (includes $24,423 and $26,058 pledged to creditors, respectively)	103,995	98,640
Deposits securing credit risk transfer agreements (includes $392,453 and $400,778 pledged to creditors, respectively)	622,330	588,867
Other—interest receivable	893	904
Total assets of Consolidated Variable Interest Entity	1,038,320	1,009,451
LIABILITIES
Asset-backed financing of a variable interest entity at fair value	296,982	307,419
Interest-only security payable at fair value	7,796	7,070
Accounts payable and accrued liabilities—interest payable	893	904
SHAREHOLDERS’ EQUITY
Total liabilities of Consolidated Variable Interest Entity	305,671	315,393
PennyMac Financial Services, Inc. [Member]
ASSETS
Due from PennyMac Financial Services, Inc.	313	4,154
LIABILITIES
Assets sold under agreements to repurchase	142,938	144,128
Due to PennyMac Financial Services, Inc.	$ 27,356	$ 27,119

Consolidated Balance Sheets (U3

Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Mortgage loans acquired for sale at fair value, pledged to creditors	$ 1,097,266,000	$ 1,249,277,000
Mortgage loans at fair value, pledged to creditors	770,911,000	1,081,893,000
Derivative assets, pledged to creditors	24,423,000	26,058,000
Real estate pledged to creditors	105,484,000	124,532,000
Mortgage servicing rights at fair value	957,013,000	91,459,000
Mortgage servicing rights pledged to creditors	941,686,000	831,892,000
Deposits securing credit risk transfer agreements, pledged to creditors	$ 392,453,000	$ 400,778,000
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	$ 310,000,000	$ 310,000,000
Common shares, authorized	500,000,000	500,000,000
Common shares, par value	$ 0.01	$ 0.01
Common shares, issued	60,882,954	61,334,087
Common shares, outstanding	60,882,954	61,334,087
Real Estate Acquired in Satisfaction of Debt [Member]
Real estate pledged to creditors	$ 105,484,000	$ 124,532,000
Real Estate Held for Investment [Member]
Real estate pledged to creditors	$ 31,899,000	$ 31,128,000

Consolidated Statements of Inco

Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net investment income
Net gain on mortgage loans acquired for sale	$ 7,627	$ 19,025
Mortgage loan origination fees	7,037	8,290
Net gain (loss) on investments	18	16,721
Net mortgage loan servicing fees	56,155	11,752
Interest income	40,980	48,100
Interest expense:
Interest expense	34,816	37,179
Net interest income	6,164	10,921
Results of real estate acquired in settlement of loans	(3,226)	(4,246)
Other	1,898	2,011
Net investment income	75,673	64,474
Expenses
Mortgage loan fulfillment fees	11,944	16,570
Mortgage loan servicing fees	11,019	10,486
Management fees	5,696	5,008
Mortgage loan collection and liquidation	2,229	354
Real estate held for investment	1,438	1,088
Professional services	1,319	1,453
Compensation	1,268	1,892
Mortgage loan origination	272	1,512
Other	2,650	3,503
Total expenses	37,835	41,866
Income before provision for (benefit from) income taxes	37,838	22,608
Provision for (benefit from) income taxes	9,652	(6,129)
Net income	28,186	28,737
Dividends on preferred shares	6,234	571
Net income attributable to common shareholders	$ 21,952	$ 28,166
Earnings per common share
Basic	$ 0.36	$ 0.42
Diluted	$ 0.35	$ 0.40
Weighted-average common shares outstanding
Basic	60,761	66,719
Diluted	69,875	75,186
Dividends declared per common share	$ 0.47	$ 0.47
Nonaffiliates [Member]
Net investment income
Net gain on mortgage loans acquired for sale	$ 4,986	$ 16,624
Net gain (loss) on investments	(7,733)	18,091
Net mortgage loan servicing fees	55,560	11,460
Interest income	37,046	43,453
Interest expense:
Interest expense	32,840	35,374
PennyMac Financial Services, Inc. [Member]
Net investment income
Net gain on mortgage loans acquired for sale	2,641	2,401
Net gain (loss) on investments	7,751	(1,370)
Net mortgage loan servicing fees	595	292
Interest income	3,934	4,647
Interest expense:
Interest expense	$ 1,976	$ 1,805

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Preferred Shares [Member]	Common Shares [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [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	28,737			0	28,737
Share-based compensation, Amount	1,527		$ 1	1,526	0
Share-based compensation, Shares			153
Issuance of preferred shares, Amount	115,000	$ 115,000		0	0
Issuance of preferred shares, Shares		4,600
Issuance costs relating to preferred shares	(3,828)	$ (3,828)		0	0
Dividends
Common share dividends	(31,653)		$ 0	0	(31,653)
Repurchase of common shares, Amount	$ (2,307)		$ (1)	(2,306)	0
Repurchase of common shares, Shares	(139)		(139)
Balance, Amount at Mar. 31, 2017	$ 1,458,590	$ 111,172	$ 667	1,376,391	(29,640)
Balance, Shares at Mar. 31, 2017		4,600	66,711
Balance, Amount (Previously Reported [Member]) at Dec. 31, 2017	1,544,585				(46,666)
Balance, Amount at Dec. 31, 2017	1,544,585	$ 299,707	$ 613	1,290,931
Balance, Shares at Dec. 31, 2017		12,400	61,334
Balance, Shares (Accounting Standards Update 2014-11 Transfers and Servicing [Member]) at Dec. 31, 2017		12,400	61,334
Balance, Amount (Accounting Standards Update 2014-11 Transfers and Servicing [Member]) at Dec. 31, 2017	14,361	$ 0	$ 0	0	14,361
Balance, Amount (Accounting Standards Update 2014-11 Transfers and Servicing [Member]) at Dec. 31, 2017	1,558,946	299,707	613	1,290,931	(32,305)
Net income	28,186			0	28,186
Share-based compensation, Amount	899		$ 2	897	0
Share-based compensation, Shares			220
Dividends
Common share dividends	(28,818)		$ 0	0	(28,818)
Preferred shares dividends	(6,236)			0	(6,236)
Repurchase of common shares, Amount	$ (10,719)		$ (6)	(10,713)	0
Repurchase of common shares, Shares	(671)		(671)
Balance, Amount at Mar. 31, 2018	$ 1,542,258	$ 299,707	$ 609	$ 1,281,115	$ (39,173)
Balance, Shares at Mar. 31, 2018		12,400	60,883

Consolidated Statements of Cha6

Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Common share dividends declared per share	$ 0.47	$ 0.47
Accumulated Deficit [Member]
Common share dividends declared per share	$ 0.47	$ 0.47

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities
Net income	$ 28,186	$ 28,737
Adjustments to reconcile net income to net cash provided by operating activities:
Net gain on mortgage loans acquired for sale at fair value	(7,627)	(19,025)
Net gain on investments	(18)	(16,721)
Change in fair value, amortization and impairment of mortgage servicing rights	(5,125)	27,046
Accrual of unearned discounts and amortization of premiums on mortgage-backed securities, mortgage loans at fair value, and asset-backed secured financing of a VIE	507	1,406
Capitalization of interest, advances and fees on mortgage loans at fair value	(2,180)	(9,903)
Accrual of interest on excess servicing spread purchased from PennyMac Financial Services, Inc.	(3,934)	(4,647)
Amortization of debt issuance costs and premiums, net	236	3,596
Results of real estate acquired in settlement of loans	3,226	4,246
Share-based compensation expense	899	1,527
Purchase of mortgage loans acquired for sale at fair value from nonaffiliates	(13,524,468)	(14,474,654)
Purchase of mortgage loans acquired for sale at fair value from PennyMac Financial Services, Inc.	(781,326)	(21,530)
Repurchase of mortgage loans subject to representation and warranties	(2,830)	(4,111)
Sale and repayment of mortgage loans acquired for sale at fair value to nonaffiliates	5,200,584	4,858,845
Sale of mortgage loans acquired for sale to PennyMac Financial Services, Inc.	9,212,188	10,016,788
Decrease in servicing advances	17,204	6,187
Decrease (increase) in due from PennyMac Financial Services, Inc.	3,767	(3,995)
(Increase) decrease in other assets	(25,462)	30,948
Decrease in accounts payable and accrued liabilities	(1,229)	(27,536)
Increase in due to PennyMac Financial Services, Inc.	237	4,340
Increase (decrease) in income taxes payable	9,652	(6,161)
Net cash provided by operating activities	122,487	395,383
Net cash provided by operating activities	122,487	395,383
Cash flows from investing activities
Net (increase) decrease in short-term investments	(52,646)	102,205
Purchase of mortgage-backed securities at fair value	(500,573)	(251,872)
Sale and repayment of mortgage-backed securities at fair value	30,741	26,123
Sale and repayment of mortgage loans at fair value	276,467	127,556
Repayment of excess servicing spread by PennyMac Financial Services, Inc.	12,291	14,632
Net settlement of derivative financial instruments	(2,329)	(28)
Sale of real estate acquired in settlement of loans	32,437	63,224
Purchase of mortgage servicing rights	0	(62)
Deposit of cash securing credit risk transfer agreements	(41,789)	(15,793)
Distribution from credit risk transfer agreements	27,655	12,305
Increase in margin deposits	(9,823)	(36,267)
Net cash (used in) provided by investing activities	(227,569)	42,023
Net cash (used in) provided by investing activities	(227,569)	42,023
Cash flows from financing activities
Sale of assets under agreements to repurchase	17,446,171	17,770,687
Repurchase of assets sold under agreements to repurchase	(17,218,539)	(18,054,705)
Issuance of mortgage loan participation certificates	1,208,189	1,559,494
Repayment of mortgage loan participation certificates	(1,252,708)	(1,512,435)
Repayments of assets sold to PennyMac Financial Services, Inc. under agreement to repurchase	(3,483)	(175,000)
Repayment of asset-backed financing of a variable interest entity at fair value	(3,915)	(13,944)
Advances under assets sold to to PennyMac Financial Services, Inc. under agreement to repurchase	2,293	0
Payment of debt issuance costs	(2,306)	(3,140)
Issuance of preferred shares	0	115,000
Payment of issuance costs related to preferred shares	0	(3,828)
Repurchase of common shares	(10,719)	(2,307)
Payment of dividends to preferred shareholders	(6,236)	0
Payment of dividends to common shareholders	(29,145)	(31,655)
Net cash provided by (used in) financing activities	129,602	(351,833)
Net increase in cash and restricted cash	24,520	85,573
Cash and restricted cash at beginning of quarter	77,647	34,476
Cash and restricted cash at end of quarter	102,167	120,049
Cash	102,167	120,049
Restricted cash	$ 0	$ 0

Organization

Organization	3 Months Ended
	Mar. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Organization	Note 1—Organization PennyMac Mortgage Investment Trust (“PMT” or the “Company”) was organized in Maryland on May 18, 2009, and commenced operations on August 4, 2009, when it completed its initial offerings of common shares of beneficial interest (“common shares”). 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: correspondent production, credit sensitive strategies, interest rate sensitive strategies and corporate: • 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 mortgage loans either directly or in the form of mortgage-backed securities (“MBS”), using the services of PNMAC Capital Management, LLC (“PCM” or the “Manager”) and PennyMac Loan Services, LLC (“PLS”), both indirect controlled subsidiaries of PennyMac Financial Services, Inc. (“PFSI”). Most of the mortgage loans the Company has acquired in its correspondent production activities have been eligible for sale to government-sponsored entities 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 credit sensitive strategies segment represents the Company’s investments in distressed mortgage loans, real estate acquired in settlement of mortgage loans (“REO”), real estate held for investment, credit risk transfer agreements (“CRT Agreements”), non-Agency subordinated bonds and small balance commercial real estate mortgage loans. • The interest rate sensitive strategies segment represents the Company’s investments in mortgage servicing rights (“MSRs”), excess servicing spread (“ESS”), Agency and senior non-Agency MBS and the related interest rate hedging activities. • The corporate segment includes certain interest income, management fee and corporate expense amounts. 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, beginning with its taxable period ended on December 31, 2009. To maintain its tax status as a REIT, the Company has to distribute at least 90% of its taxable income in the form of qualifying distributions to shareholders.

Basis of Presentation and Accou

Basis of Presentation and Accounting Changes	3 Months Ended
	Mar. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Basis of Presentation and Accounting Changes	Note 2—Basis of Presentation and Accounting Changes The accompanying 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 The accompanying unaudited consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the financial position, results of operations, and cash flows for the interim periods, but are not necessarily indicative of the results of operations that may be anticipated for the full year. Intercompany accounts and transactions have been eliminated. Preparation of financial statements in compliance with GAAP requires the Manager 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. Mortgage Servicing Rights Effective January 1, 2018, the Company has elected to change the accounting for the classes of MSRs it accounted for using the amortization method through December 31, 2017, to the fair value method as allowed in the Transfers and Servicing Revenue As disclosed in Note 33 – Recently Issued Accounting Pronouncements Receivables, Investments and Debt and Equity Securities, Transfers and Servicing, Financial Instruments Derivatives and Hedging . Cash Flows During the quarter ended March 31, 2018, the Company adopted FASB Accounting Standards Update 2016-18, Statement of Cash Flows (Topic 230) – Restricted Cash

Concentration of Risks

Concentration of Risks	3 Months Ended
	Mar. 31, 2018
Risks And Uncertainties [Abstract]
Concentration of Risks	Note 3—Concentration of Risks As discussed in Note 1 — Organization Due to the nature of the Company’s investments in distressed mortgage loans, PMT is exposed, to a greater extent than traditional mortgage investors, to the risks associated with loan performance and resolution, including that borrowers may be in economic distress and/or may have become unemployed, bankrupt or otherwise unable or unwilling to make payments when due, and that fluctuations in the residential real estate market may affect the performance of its investments. Factors influencing these risks include, but are not limited to: • changes in the overall economy, unemployment rates and residential real estate fair values in the markets where the properties securing the Company’s distressed mortgage loans are located; • PCM’s ability to identify and PLS’ ability to execute optimal resolutions of distressed mortgage loans; • the accuracy of valuation information obtained during the Company’s due diligence activities; • PCM’s ability to effectively model, and to develop appropriate model inputs that properly anticipate, future outcomes; • the level of government support for resolution of distressed mortgage loans and the effect of current and future proposed and enacted legislative and regulatory changes on the Company’s ability to effect cures or resolutions to distressed mortgage loans; and • regulatory, judicial and legislative support of the foreclosure process, and the resulting effect on the Company’s ability to acquire and liquidate the real estate securing its portfolio of distressed mortgage loans in a timely manner or at all. Due to these uncertainties, there can be no assurance that risk management activities identified and executed on PMT’s behalf will prevent significant losses arising from the Company’s investments in real estate-related assets. As detailed in Note 5 — Loan Sales and Variable Interest Entities Most of the distressed mortgage loans and REO has been acquired by the Company in prior years from or through one or more subsidiaries of JPMorgan Chase & Co., Citigroup Inc., and Bank of America Corporation, as presented in the following summary: March 31, 2018 December 31, 2017 (in thousands) JPMorgan Chase & Co. Mortgage loans at fair value $ 185,224 $ 315,437 REO 59,178 66,294 244,402 381,731 Citigroup Inc. Mortgage loans at fair value 181,334 280,488 REO 21,091 26,702 202,425 307,190 Bank of America Corporation Mortgage loans at fair value 86,478 143,969 REO 26,050 27,970 112,528 171,939 $ 559,355 $ 860,860 Total carrying value of distressed mortgage loans at fair value and REO $ 609,893 $ 931,298

Transactions with Related Parti

Transactions with Related Parties	3 Months Ended
	Mar. 31, 2018
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 equal to (a) no greater than the product of (i) 0.35% and (ii) the aggregate initial unpaid principal balance (the “Initial UPB”) of all mortgage loans purchased in such month, plus (b) in the case of all mortgage loans other than mortgage 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 mortgage loans sold and securitized in such month; provided however, that no fulfillment fee shall be due or payable to PLS with respect to any mortgage loans underwritten to Ginnie Mae guidelines. 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 salable in accordance with the Ginnie Mae Mortgage-Backed Securities 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 basis points, generally based on the average number of calendar days loans are held by the Company prior to purchase by PLS. The discretionary reductions and volume reimbursements described above are no longer in effect. 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, 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 periods, unless terminated earlier in accordance with the terms of the agreement. The Company purchases newly originated loans from PLS under a mortgage loan participation purchase and sale agreement and a flow commercial mortgage loan purchase agreement. Historically, the Company has used the mortgage loan participation purchase and sale agreement for the purpose of purchasing from PLS prime jumbo residential mortgage loans. The Company uses the flow commercial mortgage loan purchase agreement for the purpose of purchasing from PLS small balance commercial mortgage loans, including multifamily mortgage loans, originated as part of PLS’s commercial lending activities. Following is a summary of correspondent production activity between the Company and PLS: Quarter ended March 31, 2018 2017 (in thousands) Purchases of mortgage loans acquired for sale from PLS $ 781,326 $ 21,530 Mortgage loans fulfillment fees earned by PLS $ 11,944 $ 16,570 UPB of mortgage loans fulfilled by PLS $ 4,225,631 $ 4,631,906 Sourcing fees received from PLS included in Net gain on mortgage loans acquired for sale $ 2,641 $ 2,871 UPB of mortgage loans sold to PLS $ 8,847,873 $ 9,574,717 Early purchase program fees paid to PLS included in Mortgage loan servicing fees $ — $ 5 Tax service fee paid to PLS included in Other $ 1,208 $ 1,379 March 31, 2018 December 31, 2017 (in thousands) Mortgage loans included in Mortgage loans acquired for sale at fair value pending sale to PLS $ 259,673 $ 279,571 Mortgage Loan Servicing Activities The Company, through its Operating Partnership, has an amended and restated mortgage loan servicing agreement with PLS dated as of September 12, 2016. The servicing agreement provides for servicing fees earned by PLS that are based on a percentage of the mortgage loan’s unpaid principal balance or fixed per loan monthly amounts based on the delinquency, bankruptcy and/or foreclosure status of the serviced mortgage loan or the 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 late charges relating to mortgage loans it services for the Company. • The base servicing fee rates for distressed whole mortgage 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. • 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. • The base servicing fees for non-distressed mortgage 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 mortgage 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 mortgage loans. • To the extent that these non-distressed mortgage loans become delinquent, PLS is entitled to an additional servicing fee per mortgage loan ranging from $10 to $55 per month and based on the delinquency, bankruptcy and foreclosure status of the mortgage 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. • 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 limited employees and infrastructure. For these services, PLS received a supplemental fee of $25 per month for each distressed whole loan. PLS is entitled to reimbursement for all customary, good faith reasonable and necessary out-of-pocket expenses incurred in performance of its servicing obligations. • PLS is also entitled to certain activity-based fees for distressed whole mortgage 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 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 mortgage loan in any 18-month period. • PLS, on behalf of the Company, is entitled to retain any incentive payments made to it and to which it is entitled under the U.S. Department of Treasury’s Home Affordable Modification Plan (“HAMP”); provided, however, that with respect to any such incentive payments paid to PLS under HAMP in connection with a mortgage loan modification for which the Company previously paid PLS a modification fee, PLS shall reimburse the Company an amount equal to the incentive payments. The term of the 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 mortgage 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 mortgage loan servicing fees earned by PLS and MSR recapture income earned from PLS: Quarter ended March 31, 2018 2017 (in thousands) Mortgage loans servicing fees: Mortgage loans acquired for sale at fair value: Base $ 56 $ 65 Activity-based 122 143 178 208 Mortgage loans at fair value: Distressed mortgage loans: Base 1,005 1,958 Activity-based 2,080 2,390 3,085 4,348 Mortgage loans held in VIE: Base 34 31 Activity-based — — 34 31 MSRs: Base 7,615 5,806 Activity-based 107 93 7,722 5,899 $ 11,019 $ 10,486 Average investment in: Mortgage loans acquired for sale at fair value $ 1,046,289 $ 1,099,406 Mortgage loans at fair value: Distressed mortgage loans $ 738,333 $ 1,327,421 Mortgage loans held in a VIE $ 314,717 $ 361,110 Average MSR portfolio $ 73,694,438 $ 57,927,056 MSR recapture income recognized included in Net mortgage loan servicing fees - from PennyMac Financial Service, Inc. $ 595 $ 292 Management Fees Under a 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 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 calculated quarterly and is equal to: (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. The “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 Fannie Mae MBS yield (the target yield) for such quarter. 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, and a performance incentive fee is earned. 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. Following is a summary of the base management and performance incentive fees payable to PCM recorded by the Company: Quarter ended March 31, 2018 2017 (in thousands) Base management $ 5,696 $ 5,008 Performance incentive — — $ 5,696 $ 5,008 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’ personnel, 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 pro rata portion of rent, telephone, utilities, office furniture, equipment, machinery and other office, internal and overhead expenses of PCM and its affiliates required for the Company’s and its subsidiaries’ operations. These expenses are allocated based on the ratio of the Company’s and its subsidiaries’ proportion of gross assets compared to all remaining gross assets managed by PCM as calculated at each fiscal quarter end. Following is a summary of the Company’s reimbursements to PCM and its affiliates for expenses: Quarter ended March 31, 2018 2017 (in thousands) Reimbursement of: Common overhead incurred by PCM and its affiliates $ 1,121 $ 1,434 Expenses incurred on the Company’s behalf, net 573 255 $ 1,694 $ 1,689 Payments and settlements during the quarter (1) $ 7,658 $ 24,393 (1) Payments and settlements include payments and netting settlements made pursuant to master netting agreements between the Company and PFSI for operating, investment 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 mortgage 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 mortgage 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 mortgage loans. However, under the Spread Acquisition Agreement, in any month where the transferred ESS relating to newly originated Ginnie Mae mortgage loans is not equivalent to at least 90% of the product of the excess servicing fee rate and the unpaid principal balance of the refinanced mortgage 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 mortgage loans is not equivalent to at least 90% of the product of the excess servicing fee rate and the unpaid principal balance of the modified mortgage 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, wire cash to the Company 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: Quarter ended March 31, 2018 2017 (in thousands) ESS: Received pursuant to a recapture agreement $ 904 $ 1,573 Repayments and sales $ 12,291 $ 14,632 Interest income $ 3,934 $ 4,647 Net gain (loss) included in Net gain (loss) on investments: Valuation changes $ 6,921 $ (2,773 ) Recapture income 830 1,403 $ 7,751 $ (1,370 ) Financing Activities PFSI held 75,000 of the Company’s common shares at both March 31, 2018 and December 31, 2017. 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”). Also in connection with its IPO, the Company agreed to pay the IPO underwriters up to $5.9 million in contingent underwriting fees. There were no reimbursements during the quarters ended March 31, 2018, and March 31, 2017. Following is a summary of financing activities between the Company and PFSI: Quarter ended March 31, 2018 2017 (in thousands) Interest expense $ 1,976 $ 1,805 March 31, 2018 December 31, 2017 (in thousands) Assets sold to PFSI under agreement to repurchase $ 142,938 $ 144,128 Conditional Reimbursement payable to PFSI included in Accounts payable and accrued liabilities $ 870 $ 870 Amounts Receivable from and Payable to PFSI Amounts receivable from and payable to PFSI are summarized below: March 31, 2018 December 31, 2017 (in thousands) Due from PFSI: MSR recapture receivable $ 207 $ 282 Other 106 3,872 $ 313 $ 4,154 Due to PFSI: Allocated expenses and expenses paid by PFSI on PMT’s behalf $ 8,806 $ 11,542 Management fees 5,696 5,901 Mortgage loan servicing fees 5,562 6,583 Fulfillment fees 4,471 346 Correspondent production fees 1,825 1,735 Conditional Reimbursement 870 870 Interest on Assets sold to PFSI under agreement to repurchase 126 142 $ 27,356 $ 27,119

Loan Sales and Variable Interes

Loan Sales and Variable Interest Entities	3 Months Ended
	Mar. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Loan Sales and Variable Interest Entities	Note 5—Loan Sales and Variable Interest Entities The Company is a variable interest holder in various special purpose entities that relate to its mortgage loan transfer and financing activities. These entities are classified as VIEs for accounting purposes. The Company has distinguished its involvement with VIEs between those VIEs which the Company does not consolidate and those VIEs which the Company consolidates. Unconsolidated VIEs with Continuing Involvement The following table summarizes cash flows between the Company and transferees in transfers of mortgage loans that are accounted for as sales where the Company maintains continuing involvement with the mortgage loans: Quarter ended March 31, 2018 2017 (in thousands) Cash flows: Proceeds from sales $ 5,200,584 $ 4,858,845 Mortgage loan servicing fees received (1) $ 48,732 $ 37,281 (1) Net of guarantee fees The following table summarizes unpaid principal balance (“UPB”) information for mortgage loans that are accounted for as sales for the dates presented: March 31, 2018 December 31, 2017 (in thousands) UPB of mortgage loans outstanding $ 74,783,511 $ 71,639,351 Delinquent mortgage loans: 30-89 days delinquent $ 360,518 $ 532,673 90 or more days delinquent: Not in foreclosure $ 288,653 $ 280,786 In foreclosure $ 31,989 $ 25,258 Bankruptcy $ 56,032 $ 52,202 Custodial funds managed by the Company (1) $ 1,005,744 $ 879,321 (1) Custodial funds include borrower and investor custodial cash accounts relating to mortgage loans serviced under the servicing agreements and are not recorded on the Company’s consolidated balance sheets. The Company earns placement fees on certain of the custodial funds it manages on behalf of the mortgage loans’ investors, which are included in Interest income Consolidated VIEs Credit Risk Transfer Agreements The Company, through PennyMac Corp (“PMC”), entered into CRT Agreements with Fannie Mae, pursuant to which PMC, through subsidiary trust entities, sells pools of mortgage loans into Fannie Mae-guaranteed securitizations while retaining the Recourse Obligations as part of the retention of an interest-only ownership interest in such mortgage loans. The mortgage loans subject to the CRT Agreements are transferred by PMC to subsidiary trust entities which sell the mortgage loans into Fannie Mae mortgage loan securitizations. Transfers of mortgage loans subject to CRT Agreements receive sale accounting treatment. The Deposits securing CRT Agreements Net gain (loss) on investments Following is a summary of the CRT Agreements: Quarter ended March 31, 2018 2017 (in thousands) UPB of mortgage loans sold under CRT Agreements $ 3,210,478 $ 1,834,295 Deposits securing CRT Agreements $ 41,789 $ 15,793 Increase in commitments to fund Deposits securing CRT Agreements resulting from sale of mortgage loans under CRT Agreements $ 70,486 $ 48,150 Interest earned on Deposits securing Agreements $ 2,031 $ 408 Gains recognized on CRT Agreements included in Net gain (loss) on investments Realized $ 19,329 $ 10,288 Resulting from valuation changes 5,355 10,019 24,684 20,307 Change in fair value of interest-only security payable at fair value (2,133 ) (1,720 ) $ 22,551 $ 18,587 Payments made to settle losses $ 828 $ 149 March 31, 2018 December 31, 2017 (in thousands) UPB of mortgage loans subject to credit guarantee obligations $ 29,726,369 $ 26,845,392 Delinquency status (in UPB): Current $ 29,456,524 $ 26,540,953 30—89 days delinquent $ 130,583 $ 179,144 90—180 days delinquent $ 90,418 $ 101,114 180 or more days delinquent $ 26,343 $ 5,146 Foreclosure $ 8,335 $ 5,463 Bankruptcy $ 14,166 $ 13,572 Carrying value of CRT Agreements: Derivative assets $ 103,995 $ 98,640 Deposits securing CRT agreements $ 622,330 $ 588,867 Interest-only security payable at fair value $ 7,796 $ 7,070 CRT Agreement assets pledged to secure assets sold under agreements to repurchase: Deposits securing CRT Agreements $ 392,453 $ 400,778 Derivative assets $ 24,423 $ 26,058 Commitments to fund Deposits securing credit risk transfer agreements $ 552,957 $ 482,471 Jumbo Mortgage Loan Financing On September 30, 2013, the Company completed a securitization transaction in which PMT Loan Trust 2013-J1, a VIE, issued $537.0 million in UPB of certificates backed by fixed-rate prime jumbo mortgage loans, at a 3.9% weighted yield. The fair value of the certificates retained by the Company was $14.1 million as of March 31, 2018. The Company includes the balance of certificates issued to nonaffiliates in Asset backed financing of a variable interest entity at fair value

Fair Value

Fair Value	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value	Note 6—Fair Value The Company’s consolidated financial statements include assets and liabilities that are measured based on their fair values. Measurement at 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 Manager 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 the asset or liability and are developed based on market data obtained from sources independent of the Company. These may include quoted prices for similar assets or liabilities, interest rates, prepayment speeds, credit risk and other inputs. • 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 assets and liabilities, 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 Manager 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 to their fair values. Likewise, due to the general illiquidity of some of these assets and liabilities, subsequent transactions may be at values significantly different from those reported. Fair Value Accounting Elections The Manager identified all of the Company’s non-cash financial assets and MSRs to be accounted for at fair value. The Manager has elected to account for these assets at fair value so such changes in fair value will be reflected in income as they occur and more timely reflect the results of the Company’s performance. The Manager has also identified the Company’s asset-backed financing of a VIE and interest only security payable at fair value to be accounted for at fair value to reflect the generally offsetting changes in fair value of these borrowings to changes in fair value of assets at fair value collateralizing these financings. For other borrowings, the Manager has determined that historical cost accounting is more appropriate because under this method debt issuance costs are amortized over the term of the debt facility, thereby matching the debt issuance cost to the periods benefiting from the availability of the debt. Before January 1, 2018, originated MSRs backed by mortgage loans with initial interest rates of less than or equal to 4.5% were accounted for using the amortization method. Beginning January 1, 2018, the Company elected to account for all MSRs at fair value prospectively. Financial Statement Items Measured at Fair Value on a Recurring Basis Following is a summary of financial statement items that are measured at fair value on a recurring basis: March 31, 2018 Level 1 Level 2 Level 3 Total (in thousands) Assets: Short-term investments $ 71,044 $ — $ — $ 71,044 Mortgage-backed securities at fair value — 1,436,456 — 1,436,456 Mortgage loans acquired for sale at fair value — 1,107,844 7,690 1,115,534 Mortgage loans at fair value — 311,102 468,387 779,489 Excess servicing spread purchased from PFSI — — 236,002 236,002 Derivative assets: Interest rate lock commitments — — 3,220 3,220 CRT Agreements — — 103,995 103,995 Repurchase agreement derivatives — — 5,892 5,892 Forward purchase contracts 11,400 — 11,400 Forward sale contracts — 6 — 6 MBS put options — 4,086 — 4,086 Call options on interest rate futures 492 — — 492 Put options on interest rate futures 367 — — 367 Total derivative assets before netting 859 15,492 113,107 129,458 Netting — — — (6,940 ) Total derivative assets after netting 859 15,492 113,107 122,518 Mortgage servicing rights at fair value — — 957,013 957,013 $ 71,903 $ 2,870,894 $ 1,782,199 $ 4,718,056 Liabilities: Asset-backed financing of a VIE at fair value $ — $ 296,982 $ — $ 296,982 Interest-only security payable at fair value — — 7,796 7,796 Derivative liabilities: Interest rate lock commitments — — 511 511 Forward purchase contracts — 1 — 1 Forward sales contracts — 8,345 — 8,345 Total derivative liabilities before netting — 8,346 511 8,857 Netting — — — (5,221 ) Total derivative liabilities after netting — 8,346 511 3,636 $ — $ 305,328 $ 8,307 $ 308,414 December 31, 2017 Level 1 Level 2 Level 3 Total (in thousands) Assets: Short-term investments $ 18,398 $ — $ — $ 18,398 Mortgage-backed securities at fair value — 989,461 — 989,461 Mortgage loans acquired for sale at fair value — 1,261,380 8,135 1,269,515 Mortgage loans at fair value — 321,040 768,433 1,089,473 Excess servicing spread purchased from PFSI — — 236,534 236,534 Derivative assets: Interest rate lock commitments — — 4,859 4,859 CRT Agreements — — 98,640 98,640 Repurchase agreement derivatives — — 3,748 3,748 Forward purchase contracts — 4,343 — 4,343 Forward sale contracts — 387 — 387 MBS put options — 3,170 — 3,170 Put options on interest rate futures 656 — — 656 Total derivative assets before netting 656 7,900 107,247 115,803 Netting — — — (1,922 ) Total derivative assets after netting 656 7,900 107,247 113,881 Mortgage servicing rights at fair value — — 91,459 91,459 $ 19,054 $ 2,579,781 $ 1,211,808 $ 3,808,721 Liabilities: Asset-backed financing of a VIE at fair value $ — $ 307,419 $ — $ 307,419 Interest-only security payable at fair value — — 7,070 7,070 Derivative liabilities: Interest rate lock commitments — — 227 227 Forward purchase contracts — 248 — 248 Forward sales contracts — 2,830 — 2,830 Total derivative liabilities before netting — 3,078 227 3,305 Netting — — — (1,999 ) Total derivative liabilities after netting — 3,078 227 1,306 $ — $ 310,497 $ 7,297 $ 315,795 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: Quarter ended March 31, 2018 Mortgage loans acquired for sale at fair value Mortgage loans at fair value Excess servicing spread Interest rate lock commitments (1) CRT Agreements Repurchase agreement derivatives Mortgage servicing rights Total (in thousands) Assets: 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 2,831 — — 4,609 — 2,164 — 9,604 Repayments and sales (3,539 ) (272,513 ) (12,291 ) — (19,329 ) (8 ) — (307,680 ) Capitalization of interest — 2,180 3,934 — — — — 6,114 Capitalization of advances — 1,677 — — — — — 1,677 ESS received pursuant to a recapture agreement with PFSI — — 904 — — — — 904 Servicing received as proceeds from sales of mortgage loans — — — — — — 66,546 66,546 Changes in fair value included in income arising from: Changes in instrument-specific credit risk — 2,681 — — — — — 2,681 Other factors 103 (12,632 ) 6,921 (19,467 ) 24,684 (12 ) 25,973 25,570 103 (9,951 ) 6,921 (19,467 ) 24,684 (12 ) 25,973 28,251 Transfers of mortgage loans to REO and real estate held for investment — (21,439 ) — — — — — (21,439 ) Transfers of mortgage loans acquired for sale at fair value from "Level 2" to "Level 3" (2) 160 — — — — — — 160 Transfers of interest rate lock commitments to mortgage loans acquired for sale — — — 12,935 — — — 12,935 Balance, March 31, 2018 $ 7,690 $ 468,387 $ 236,002 $ 2,709 $ 103,995 $ 5,892 $ 957,013 $ 1,781,688 Changes in fair value recognized during the quarter relating to assets still held at March 31, 2018 $ (14 ) $ (9,040 ) $ 6,921 $ 2,709 $ 5,355 $ 77 $ 25,973 $ 31,981 (1) For the purpose of this table, the interest rate lock commitment (“IRLC”) asset and liability positions are shown net. (2) During the quarter ended March 31, 2018, the Manager identified certain “Level 2” fair value mortgage loans that were not salable into the prime mortgage market and therefore transferred them to “Level 3”. Quarter ended March 31, 2018 Interest-only security payable (in thousands) Liabilities: Balance, December 31, 2017 $ 7,070 Changes in fair value included in income arising from: Changes in instrument-specific credit risk — Other factors 726 726 Balance, March 31, 2018 $ 7,796 Changes in fair value recognized during the quarter relating to liability outstanding at March 31, 2018 $ 726 Quarter ended March 31, 2017 Mortgage Excess Interest Mortgage loans servicing rate lock CRT servicing at fair value spread commitments (1) Agreements rights Total (in thousands) Assets: Balance, December 31, 2016 $ 1,354,572 $ 288,669 $ 3,777 $ 15,610 $ 64,136 $ 1,726,764 Purchases and issuances — — 17,762 — 62 17,824 Repayments and sales (113,576 ) (14,632 ) — (10,288 ) — (138,496 ) Capitalization of interest 9,903 4,647 — — — 14,550 Capitalization of advances 6,349 — — — — 6,349 ESS received pursuant to a recapture agreement with PFSI — 1,573 — — — 1,573 Servicing received as proceeds from sales of mortgage loans — — — — 7,478 7,478 Changes in fair value included in income arising from: Changes in instrument-specific credit risk 4,970 — — — — 4,970 Other factors (1,754 ) (2,773 ) 11,171 20,307 (1,993 ) 24,958 3,216 (2,773 ) 11,171 20,307 (1,993 ) 29,928 Transfers of mortgage loans to REO and real estate held for investment (30,911 ) — — — — (30,911 ) Transfers of interest rate lock commitments to mortgage loans acquired for sale — — (23,989 ) — — (23,989 ) Balance, March 31, 2017 $ 1,229,553 $ 277,484 $ 8,721 $ 25,629 $ 69,683 $ 1,611,070 Changes in fair value recognized during the quarter relating to assets still held at March 31, 2017 $ 485 $ (2,773 ) $ 8,721 $ 10,019 $ (1,993 ) $ 14,459 (1) For the purpose of this table, the IRLC asset and liability positions are shown net. Quarter ended March 31, 2017 Interest-only security payable (in thousands) Liabilities: Balance, December 31, 2016 $ 4,114 Changes in fair value included in income arising from: Changes in instrument-specific credit risk — Other factors 487 487 Balance, March 31, 2017 $ 4,601 Changes in fair value recognized during the quarter relating to liability outstanding at March 31, 2017 $ 487 The Company had transfers among the fair value levels arising from transfers of IRLCs to mortgage loans held for sale at fair value upon purchase of the respective mortgage loans. Following are the fair values and related principal amounts due upon maturity of mortgage loans accounted for under the fair value option (including mortgage loans acquired for sale, mortgage loans held in a consolidated VIE, and distressed mortgage loans at fair value): March 31, 2018 December 31, 2017 Fair value Principal amount due upon maturity Difference Fair value Principal amount due upon maturity Difference (in thousands) Mortgage loans acquired for sale at fair value: Current through 89 days delinquent: $ 1,114,282 $ 1,084,121 $ 30,161 $ 1,268,121 $ 1,221,125 $ 46,996 90 or more days delinquent: Not in foreclosure 606 725 (119 ) 950 1,120 (170 ) In foreclosure 646 683 (37 ) 444 496 (52 ) 1,252 1,408 (156 ) 1,394 1,616 (222 ) $ 1,115,534 $ 1,085,529 $ 30,005 $ 1,269,515 $ 1,222,741 $ 46,774 Mortgage loans at fair value: Mortgage loans held in a consolidated VIE: Current through 89 days delinquent: $ 311,102 $ 312,730 $ (1,628 ) $ 321,040 $ 316,684 $ 4,356 90 or more days delinquent: Not in foreclosure — — — — — — In foreclosure — — — — — — — — — — — — 311,102 312,730 (1,628 ) 321,040 316,684 4,356 Distressed mortgage loans at fair value: Current through 89 days delinquent: 263,263 334,185 (70,922 ) 414,785 519,009 (104,224 ) 90 or more days delinquent: Not in foreclosure 97,971 155,224 (57,253 ) 166,749 257,038 (90,289 ) In foreclosure 107,153 156,812 (49,659 ) 186,899 267,911 (81,012 ) 205,124 312,036 (106,912 ) 353,648 524,949 (171,301 ) 468,387 646,221 (177,834 ) 768,433 1,043,958 (275,525 ) $ 779,489 $ 958,951 $ (179,462 ) $ 1,089,473 $ 1,360,642 $ (271,169 ) 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: Quarter ended March 31, 2018 Net gain on Net mortgage mortgage loans Net gain loan Net acquired (loss) on servicing interest for sale investments fees income Total (in thousands) Assets: Short-term investments $ — $ — $ — $ — $ — Mortgage-backed securities at fair value — (22,397 ) — 440 (21,957 ) Mortgage loans acquired for sale at fair value (23,678 ) — — — (23,678 ) Mortgage loans at fair value — (15,530 ) — 1,774 (13,756 ) ESS at fair value — 6,921 — 3,934 10,855 MSRs at fair value — — 25,973 — 25,973 $ (23,678 ) $ (31,006 ) $ 25,973 $ 6,148 $ (22,563 ) Liabilities: Interest-only security payable $ — $ 726 $ — $ — $ 726 Asset-backed financing of a VIE at fair value — 6,183 — 339 6,522 $ — $ 6,909 $ — $ 339 $ 7,248 Quarter ended March 31, 2017 Net gain on Net mortgage mortgage loans Net gain loan Net acquired on servicing interest for sale investments fees income Total (in thousands) Assets: Short-term investments $ — $ — $ — $ — $ — Mortgage-backed securities at fair value — 140 — (1,318 ) (1,178 ) Mortgage loans acquired for sale at fair value 14,158 — — — 14,158 Mortgage loans at fair value — 3,532 — 10,201 13,733 ESS at fair value — (2,773 ) — 4,647 1,874 MSRs at fair value — — (1,993 ) — (1,993 ) $ 14,158 $ 899 $ (1,993 ) $ 13,530 $ 26,594 Liabilities: Interest-only security payable $ — $ (487 ) $ — $ — $ (487 ) Asset-backed financing of a VIE at fair value — (24 ) — (387 ) (411 ) $ — $ (511 ) $ — $ (387 ) $ (898 ) Financial Statement Items Measured at Fair Value on a Nonrecurring Basis Following is a summary of the carrying value at year end for financial statement items that were re-measured at fair value on a nonrecurring basis during the periods presented: March 31, 2018 Level 1 Level 2 Level 3 Total (in thousands) Real estate acquired in settlement of loans $ — $ — $ 57,675 $ 57,675 $ — $ — $ 57,675 $ 57,675 December 31, 2017 Level 1 Level 2 Level 3 Total (in thousands) Real estate acquired in settlement of loans $ — $ — $ 71,380 $ 71,380 MSRs at lower of amortized cost or fair value — — 312,995 312,995 $ — $ — $ 384,375 $ 384,375 The following table summarizes the fair value changes recognized during the period on assets held at period end that were remeasured at fair value on a nonrecurring basis: Quarter ended March 31, 2018 2017 (in thousands) Real estate asset acquired in settlement of loans $ (4,769 ) $ (7,060 ) MSRs at lower of amortized cost or fair value — 1,504 $ (4,769 ) $ (5,556 ) Real Estate Acquired in Settlement of Loans The Company evaluates its REO for impairment with reference to the respective properties’ fair values less cost to sell. The initial carrying value of the REO is measured at cost as indicated by the purchase price in the case of purchased REO or as measured by the fair value of the mortgage loan immediately before REO acquisition in the case of acquisition in settlement of a mortgage loan. REO may be subsequently revalued 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 Mortgage Servicing Rights at Lower of Amortized Cost or Fair Value Before the Company adopted fair value accounting for all of its existing classes of MSRs on January 1, 2018, the Company evaluated its MSRs at lower of amortized cost or fair value for impairment with reference to the asset’s fair value. For purposes of performing its MSR impairment evaluation, the Company stratified its MSRs at lower of amortized cost or fair value based on the interest rates borne by the mortgage loans underlying the MSRs. Mortgage loans were grouped into pools with 50 basis point interest rate ranges for fixed-rate mortgage loans with interest rates between 3.0% and 4.5% and a single pool for mortgage loans with interest rates below 3.0%. MSRs relating to adjustable rate mortgage 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 interest rate pools was below the amortized cost of the MSRs, those MSRs were impaired. When MSRs were impaired, the impairment was recognized in current-period income and the carrying value of the MSRs was adjusted using a valuation allowance. If the fair value of the MSRs subsequently increased, the increase in fair value was recognized in current period income only to the extent of the valuation allowance for the respective impairment stratum. Before the adoption of fair value accounting for all MSRs, the Manager periodically reviewed the various impairment strata to determine whether the fair value of the impaired MSRs in a given stratum was likely to recover. When the Manager deemed recovery of 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. Fair Value of Financial Instruments Carried at Amortized Cost Certain 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 Assets sold to PennyMac Financial Services, Inc. under agreements to repurchase The Manager has concluded that the fair values of Assets sold under agreements to repurchase Mortgage loan participation purchase and sale agreements Assets sold to PennyMac Financial Services, Inc. under agreements to repurchase Exchangeable senior notes Exchangeable senior notes Valuation Techniques and Inputs Most of the Company’s assets, its Asset-backed financing of a VIE, Interest-only security payable Derivative liabilities Due to the difficulty in estimating the fair values of “Level 3” fair value assets and liabilities, the Manager has assigned responsibility for estimating fair value of these assets and liabilities to specialized staff and subjects the valuation process to significant executive management oversight. The Manager’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. With respect to the Company’s non-IRLC “Level 3” fair value assets and liabilities, the FAV group reports to the Manager’s valuation committee, which oversees and approves the valuations. The FAV group monitors the models used for valuation of the Company’s non-IRLC “Level 3” fair value assets and liabilities, including the models’ performance versus actual results, and reports those results to the Manager’s valuation committee. The Manager’s valuation committee includes PFSI’s executive chairman, chief executive, chief financial, chief risk and deputy chief financial officers. The FAV group is responsible for reporting to the Manager’s 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. The fair value of the Company’s IRLCs is developed by the Manager’s Capital Markets Risk Management staff and is reviewed by the Manager’s Capital Markets Operations group. 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 or similar securities. Changes in the fair value of MBS are included in Net gain (loss) on investments Mortgage Loans Fair value of mortgage loans is estimated based on whether the mortgage loans are saleable into active markets: • Mortgage loans that are saleable into active markets, comprised of most of the Company’s mortgage loans acquired for sale at fair value and mortgage loans at fair value held in a VIE, are categorized as “Level 2” fair value assets. The fair values of mortgage loans acquired for sale at fair value are established using their quoted market or contracted price or market price equivalent. For the mortgage 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 mortgage 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 Manager believes are similar to the models and inputs used by other market participants. • Mortgage loans that are not saleable into active markets, comprised primarily of distressed mortgage loans, are categorized as “Level 3” fair value assets and their fair values are estimated using a discounted cash flow approach. Inputs to the discounted cash flow model include current interest rates, loan amount, payment status, property type, discount rates and forecasts of future interest rates, home prices, prepayment speeds, default speeds, loss severities or contracted selling price when applicable. The valuation process for “Level 3” fair value mortgage loans includes the computation by stratum of the mortgage loans’ fair values and a review for reasonableness of various measures such as weighted average life, projected prepayment and default speeds, and projected default and loss percentages. The FAV group computes the effect on the valuation of changes in inputs such as interest rates, home prices, and delinquency status to assess the reasonableness of changes in the mortgage loan valuation. Changes in fair value attributable to changes in instrument-specific credit risk are measured by the effect on fair value of the change in the respective mortgage loan’s delinquency status and performance history at period-end from the later of the beginning of the period or acquisition date. The significant unobservable inputs used in the fair value measurement of the Company’s mortgage loans at fair value are 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 mortgage 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 mortgage loans at fair value are included in Net gain (loss) on investments Following is a quantitative summary of key inputs used in the valuation of mortgage loans at fair value (excluding loans held in a VIE): Key inputs March 31, 2018 December 31, 2017 Discount rate Range 3.2% – 15.0% 2.9% – 15.0% Weighted average 6.7% 6.9% Twelve-month projected housing price index change Range 2.2% – 3.3% 3.6% – 4.6% Weighted average 3.1% 4.4% Prepayment speed (1) Range 3.1% – 6.6% 3.2% – 11.0% Weighted average 4.2% 4.2% Total prepayment speed (2) Range 10.6% – 22.8% 10.8% – 23.8% Weighted average 16.2% 16.5% (1) Prepayment speed is measured using Life Voluntary Conditional Prepayment Rate (“CPR”). (2) Total prepayment speed is measured using Life Total CPR. 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 prepayment speed and pricing spread (discount rate). 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 (loss) on investments Following are the key inputs used in determining the fair value of ESS: Key inputs March 31, 2018 December 31, 2017 UPB of underlying mortgage loans (in thousands) $ 26,236,839 $ 27,217,199 Average servicing fee rate (in basis points) 34 34 Average ESS rate (in basis points) 19 19 Pricing spread (1) Range 3.6% - 4.1% 3.8% - 4.3% Weighted average 3.9% 4.1% Annual total prepayment speed (2) Range 8.0% - 52.4% 8.4% - 41.4% Weighted average 9.9% 10.8% Life (in years) Range 1.1 - 7.8 1.4 - 7.7 Weighted average 6.8 6.5 (1) Pricing spread represents a margin that is applied to a reference interest rate’s forward rate curve to develop periodic discount rates. The Company applies a pricing spread to the United States Dollar London Interbank Offered Rate (“LIBOR”) curve for purposes of discounting cash flows relating to ESS. (2) Prepayment speed is measured using Life Total CPR. Derivative Financial Instruments 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, its estimate of the fair value of the MSRs it expects to receive in the sale of the mortgage loan and the probability that the mortgage loan will be purchased under the commitment (the “pull-through rate”). 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 mortgage 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 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 mortgage 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 mortgage loans acquired for sale Following is a quantitative summary of key unobservable inputs used in the valuation of IRLCs: Key inputs March 31, 2018 December 31, 2017 Pull-through rate Range 57.5% – 100% 58.0% - 100% Weighted average 88.0% 90.3% MSR value expressed as Servicing fee multiple Range 2.6 - 5.9 2.1 - 5.8 Weighted average 4.7 4.9 Percentage of UPB Range 0.0% – 2.6% 0.0% - 2.4% Weighted average 1.2% 1.3% CRT Agreements The fair value of CRT Agreements is established based on whether the aggregation period has been completed and the CRT Agreements have been securitized. For securitized CRT Agreements, fair value is based on indications of fair value provided to the Company by nonaffiliated brokers for the certificates representing the beneficial deposits securing the CRT Agreements, the Recourse Obligation and the IO ownership interest in these items. Fair value of the CRT derivative is derived by deducting the balance of the Deposits securing CRT Agreements Net gain (loss) on investments Following is a quantitative summary of key unobservable inputs used in the valuation of CRT Agreements: Key inputs March 31, 2018 December 31, 2017 Discount rate Range 5.6% – 6.6% 5.1% – 6.2% Weighted average 6.1% 5.6% Voluntary Prepayment speed (1) Range 8.6% – 10.4% 12.1% – 15.0% Weighted average 9.1% 13.0% Involuntary prepayment speed (2) Range 0.3% – 0.3% 0.3% – 0.3% Weighted average 0.3% 0.3% (1) Voluntary prepayment speed is measured using Life Voluntary CPR. (2) Involuntary prepayment speed is measured using Life Involuntary CPR. Repurchase Agreement Derivatives The Company has a master repurchase agreement that includes incentives for financing mortgage loans approved for satisfying certain consumer relief characteristics. These incentives are classified as embedded derivatives for financial reporting purposes and are accounted for separate from the related repurchase agreements. The Company classifies these derivatives as “Level 3” fair value assets. The significant unobservable input into the valuation of these derivative assets is the Company’s ratio of derivative value to outstanding receivable due to the time value of money and the expected approval rate of the mortgage loans financed under the master repurchase agreement. The ratio included in the Company’s fair value estimate was 97% at both March 31, 2018, and December 31, 2017. Hedging Derivatives Fair values of derivative financial instruments based on exchange traded market prices 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 market 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 mortgage loans acquired for sale Net gain (loss) on investments, Net mortgage loan servicing fees Real Estate Acquired in Settlement of Loans REO is measured based on its fair value on a nonrecurring basis and is categorized as a “Level 3” fair value asset. Fair value of REO is established by using a current estimate of fair value from a broker’s price opinion or a full appraisal, or the price given in a current contract of sale. REO fair values are reviewed by the Manager’s staff appraisers when the Company obtains multiple indications of fair value and there is a significant difference between the fair values received. The Manager’s staff appraisers will attempt to resolve the difference between the indications of fair value. In circumstances where the appraisers are not able to generate adequate data to support a fair value conclusion, the staff appraisers will order an additional appraisal to determine fair value. Changes in the fair value of REO are included in Results of real estate acquired in settlement of loans Mortgage Servicing Rights MSRs are categorized as “Level 3” fair value assets. The Company uses a discounted cash flow approach to estimate the fair value of MSRs. The key inputs used in the estimation of the fair value of MSRs include the applicable pricing spread, prepayment and default rates of the underlying mortgage loans, and annual per-loan cost to service mortgage loans, all of which are unobservable. Significant changes to any of those inputs in isolation could result in a significant change in the MSR fair value measurement. Changes in these key inputs are not necessarily directly related. Recognized changes in the fair value of MSRs are included in Net mortgage loan servicing fees 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 mortgage loans, thereby reducing the cash flows expected to accrue to the MSRs. Reductions in the fair value of MSRs affect income primarily through change in fair value and change in impairment. Through December 31, 2017, the Company accounted for certain of its MSRs using the amortization method. Beginning January 1, 2018, the Company accounts for all MSRs at fair value prospectively. Following are the key inputs used in determining the fair value of MSRs at the time of initial recognition: Quarter ended March 31, 2018 2017 Fair value Amortized cost Fair value (MSR recognized and UPB of underlying mortgage loan amounts in thousands) MSR recognized $ 66,546 $ 51,

Mortgage Loans Acquired for Sal

Mortgage Loans Acquired for Sale at Fair Value	3 Months Ended
	Mar. 31, 2018
Mortgage Loans On Real Estate [Abstract]
Mortgage Loans Acquired for Sale at Fair Value	Note 7—Mortgage Loans Acquired for Sale at Fair Value Mortgage loans acquired for sale at fair value is comprised of recently originated mortgage loans purchased by the Company for resale. Following is a summary of the distribution of the Company’s mortgage loans acquired for sale at fair value: Loan type March 31, 2018 December 31, 2017 (in thousands) Conventional: Agency-eligible $ 837,994 $ 971,910 Held for sale to PLS — Government insured or guaranteed 259,673 279,571 Commercial real estate 10,177 9,898 Repurchased pursuant to representations and warranties 7,690 8,136 $ 1,115,534 $ 1,269,515 Mortgage loans pledged to secure: Assets sold under agreements to repurchase $ 1,097,266 $ 1,201,992 Mortgage loan participation purchase and sale agreements — 47,285 $ 1,097,266 $ 1,249,277 The Company is not approved by Ginnie Mae as an issuer of Ginnie Mae-guaranteed securities which are backed by government-insured or guaranteed mortgage loans. The Company transfers government-insured or guaranteed mortgage 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 basis points, generally based on the average number of calendar days that mortgage loans are held prior to purchase by PLS

Mortgage Loans at Fair Value

Mortgage Loans at Fair Value	3 Months Ended
	Mar. 31, 2018
Text Block [Abstract]
Mortgage Loans at Fair Value	Note 8—Mortgage Loans at Fair Value Mortgage loans at fair value are comprised of mortgage 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 Manager’s determination that such a sale represents the most advantageous liquidation strategy for the identified mortgage loan. Following is a summary of the distribution of the Company’s mortgage loans at fair value: March 31, 2018 December 31, 2017 Loan type Fair value Unpaid principal balance Fair value Unpaid principal balance (in thousands) Distressed mortgage loans: Nonperforming mortgage loans $ 205,124 $ 312,036 $ 353,648 $ 524,949 Performing mortgage loans: Interest rate step-up 137,451 181,412 189,724 242,335 Fixed interest rate 102,605 128,737 186,929 236,840 Adjustable-rate/hybrid 23,207 24,036 38,132 39,834 263,263 334,185 414,785 519,009 468,387 646,221 768,433 1,043,958 Fixed interest rate jumbo mortgage loans held in a VIE 311,102 312,730 321,040 316,684 $ 779,489 $ 958,951 $ 1,089,473 $ 1,360,642 Mortgage loans at fair value pledged to secure: Assets sold under agreements to repurchase $ 459,809 $ 760,853 Asset-backed financing of a VIE at fair value 311,102 321,040 $ 770,911 $ 1,081,893 Following is a summary of certain concentrations of credit risk in the portfolio of distressed mortgage loans at fair value: Concentration March 31, 2018 December 31, 2017 (percentages are of fair value) Portion of mortgage loans originated between 2005 and 2007 73% 73% Mortgage loans with unpaid-principal balance-to-current -property-value in excess of 100% 38% 38% States contributing 5% or more of mortgage loans New York California New Jersey Florida Massachusetts New York California New Jersey Florida Massachusetts

Derivative Activities

Derivative Activities	3 Months Ended
	Mar. 31, 2018
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative Activities	Note 9—Derivative Activities The Company holds and issues derivative financial instruments in connection with its operating activities. Derivative financial instruments are created as a result of certain of the Company’s operations and the Company also enters into derivative transactions as part of its interest rate risk management activities. Derivative financial instruments created as a result of the Company’s operations include: • IRLCs that are created when the Company commits to purchase mortgage loans acquired for sale; • CRT Agreements whereby the Company retains a Recourse Obligation relating to certain mortgage loans it sells into Fannie Mae guaranteed securitizations and an IO ownership interest in such mortgage loans; and • Derivatives that are embedded in a master repurchase agreement that provides for the Company to receive interest expense offsets if it finances mortgage 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 is exposed to price risk relative to the IRLCs it issues to correspondent sellers and to the mortgage loans it purchases as a result of issuing the IRLCs. The Company bears price risk from the time an IRLC is issued to a correspondent seller until the time the purchased mortgage loan is sold. The Company is exposed to loss if market mortgage interest rates increase, because market interest rate increases generally cause the fair value of the IRLC or mortgage loan acquired for sale to decrease. The Company is exposed to losses related to its investment in MSRs if market mortgage interest rates decrease, because market interest rate decreases generally encourage mortgage refinancing activity, which reduces the expected life of the mortgage loans underlying the MSRs, causing the fair value of MSRs to decrease. To manage the price risk resulting from interest rate risk, 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 MBS, inventory of mortgage loans acquired for sale, mortgage loans held in a VIE, IRLCs and MSRs. The Company records all derivative financial instruments at fair value and records changes in fair value in current period income. Derivative Notional Amounts and Fair Value of Derivatives The Company had the following derivative assets and liabilities recorded within Derivative assets Derivative liabilities Other March 31, 2018 December 31, 2017 Fair value Fair value Notional Derivative Derivative Notional Derivative Derivative Instrument amount assets liabilities amount assets liabilities (in thousands) Derivatives not designated as hedging instruments: Not subject to master netting arrangements: Interest rate lock commitments 1,067,009 $ 3,220 $ 511 1,250,803 $ 4,859 $ 227 CRT Agreements 29,726,369 103,995 — 26,845,392 98,640 — Repurchase agreement derivatives 5,892 — 3,748 — Subject to master netting agreements ─ for hedging purposes: Forward purchase contracts 2,510,700 11,400 1 1,996,235 4,343 248 Forward sale contracts 2,297,802 6 8,345 2,565,271 387 2,830 MBS put options 1,750,000 4,086 — 2,375,000 3,170 — Call options on interest rate futures 150,000 492 — — — — Put options on interest rate futures 275,000 367 — 550,000 656 — Swap futures — — — 275,000 — — Bond futures 450,000 — — — — — Eurodollar future contracts 847,664 — — 937,000 — — Total derivative instruments before netting 129,458 8,857 115,803 3,305 Netting (6,940 ) (5,221 ) (1,922 ) (1,999 ) $ 122,518 $ 3,636 $ 113,881 $ 1,306 Margin deposits (received from) placed with derivatives counterparties included in Other assets ( ) $ (1,718 ) $ 76 Derivative assets pledged to secure assets sold under agreements to repurchase $ 24,423 $ 26,058 The following tables summarize the notional amount activity for derivative contracts used to hedge the Company’s MBS, inventory of mortgage loans acquired for sale, mortgage loans at fair value held in a VIE, IRLCs and MSRs. Quarter ended March 31, 2018 Amount, Amount, beginning Dispositions/ end Instrument of quarter Additions expirations of quarter (in thousands) Forward purchase contracts 1,996,235 19,833,104 (19,318,639 ) 2,510,700 Forward sales contracts 2,565,271 24,410,334 (24,677,803 ) 2,297,802 MBS put options 2,375,000 4,125,000 (4,750,000 ) 1,750,000 Call options on interest rate futures — 150,000 — 150,000 Put options on interest rate futures 550,000 3,325,000 (3,600,000 ) 275,000 Swap futures 275,000 — (275,000 ) — Bond futures — 450,000 — 450,000 Eurodollar future sale contracts 937,000 114,597 (203,933 ) 847,664 Quarter ended March 31, 2017 Amount, Amount, beginning Dispositions/ end Instrument of quarter Additions expirations of quarter (in thousands) Forward purchase contracts 4,840,707 18,906,029 (19,631,577 ) 4,115,159 Forward sales contracts 6,148,242 24,225,103 (24,699,931 ) 5,673,414 MBS put options 925,000 1,400,000 (1,375,000 ) 950,000 MBS call options 750,000 — (750,000 ) — Call options on interest rate futures 200,000 62,500 — 262,500 Put options on interest rate futures 550,000 1,750,000 (1,800,000 ) 500,000 Swap futures 150,000 300,000 (300,000 ) 150,000 Eurodollar future sale contracts 1,351,000 101,000 (212,000 ) 1,240,000 Treasury future buy contracts — 49,300 (49,300 ) — Treasury future sale contracts — 49,300 (49,300 ) — 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 IRLCs, CRT Agreement derivatives and repurchase agreement derivatives. As of March 31, 2018 and December 31, 2017, the Company did not enter into reverse repurchase agreements or securities lending transactions that are required to be disclosed in the following tables. Offsetting of Derivative Assets Following is a summary of net derivative assets: March 31, 2018 December 31, 2017 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: Interest rate lock commitments $ 3,220 $ — $ 3,220 $ 4,859 $ — $ 4,859 CRT Agreement derivatives 103,995 — 103,995 98,640 — 98,640 Repurchase agreement derivatives 5,892 — 5,892 3,748 — 3,748 113,107 — 113,107 107,247 — 107,247 Subject to master netting arrangements: Forward purchase contracts 11,400 — 11,400 4,343 — 4,343 Forward sale contracts 6 — 6 387 — 387 MBS put options 4,086 — 4,086 3,170 — 3,170 Call options on interest rate futures 492 — 492 — — — Put options on interest rate futures 367 — 367 656 — 656 Netting — (6,940 ) (6,940 ) — (1,922 ) (1,922 ) 16,351 (6,940 ) 9,411 8,556 (1,922 ) 6,634 $ 129,458 $ (6,940 ) $ 122,518 $ 115,803 $ (1,922 ) $ 113,881 Derivative Assets, Financial Instruments and Collateral Held by Counterparty The following table summarizes by significant counterparty the amount of derivative asset positions after considering master netting arrangements and financial instruments or cash pledged that do not meet the accounting guidance qualifying for setoff accounting: March 31, 2018 December 31, 2017 Net amount of assets presented in the Gross amounts not offset in the consolidated balance sheet Net amount of assets presented in the Gross amounts not offset in the consolidated balance sheet consolidated balance sheet Financial instruments Cash collateral received Net amount consolidated balance sheet Financial instruments Cash collateral received Net amount (in thousands) CRT Agreements $ 103,995 $ — $ — $ 103,995 $ 98,640 $ — $ — $ 98,640 Interest rate lock commitments 3,220 — — 3,220 4,859 — — 4,859 J.P. Morgan Securities LLC 6,294 — — 6,294 2,020 — — 2,020 Deutsche Bank Securities LLC 5,892 — — 5,892 3,748 — — 3,748 Federal National Mortgage Association 1,073 — — 1,073 1,606 — — 1,606 RJ O’Brien & Associates, LLC 859 — — 859 656 — — 656 Barclays Capital Inc. 324 — — 324 — — — — Credit Suisse Securities (USA) LLC 227 — — 227 809 — — 809 Mitsubishi UFJ Sec 155 — — 155 193 — — 193 RBC Capital Markets, L.P. 151 — — 151 — — — — KGS Alpha Capital Markets LP 131 — — 131 — — — — PNC Capital Markets LLC 100 — — 100 — — — — Wells Fargo Securities, LLC 90 — — 90 146 — — 146 Morgan Stanley & Co. LLC — — — — 457 — — 457 Citigroup Global Markets Inc. — — — — 429 — — 429 Jefferies & Company, Inc. — — — — 160 — — 160 Other 7 — — 7 158 — — 158 $ 122,518 $ — $ — $ 122,518 $ 113,881 $ — $ — $ 113,881 Offsetting of Derivative Liabilities and Financial Liabilities Following is a summary of net derivative liabilities and assets sold under agreements to repurchase. Assets sold under agreements to repurchase do not qualify for setoff accounting. March 31, 2018 December 31, 2017 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 $ 511 $ — $ 511 $ 227 $ — $ 227 511 — 511 227 — 227 Subject to master netting arrangements: Forward purchase contracts 1 — 1 248 — 248 Forward sales contracts 8,345 — 8,345 2,830 — 2,830 Netting — (5,221 ) (5,221 ) — (1,999 ) (1,999 ) 8,346 (5,221 ) 3,125 3,078 (1,999 ) 1,079 8,857 (5,221 ) 3,636 3,305 (1,999 ) 1,306 Assets sold under agreements to repurchase: UPB 3,409,440 — 3,409,440 3,182,504 — 3,182,504 Unamortized debt issuance costs (1,157 ) — (1,157 ) (1,618 ) — (1,618 ) 3,408,283 — 3,408,283 3,180,886 — 3,180,886 $ 3,417,140 $ (5,221 ) $ 3,411,919 $ 3,184,191 $ (1,999 ) $ 3,182,192 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 meet the accounting guidance qualifying for setoff accounting. All assets sold under agreements to repurchase represent sufficient collateral or exceed the liability amount recorded on the consolidated balance sheet. March 31, 2018 December 31, 2017 Net amount of liabilities presented in the Gross amounts not offset in the consolidated balance sheet Net amount of liabilities presented in the Gross amounts not offset in the consolidated balance sheet consolidated balance sheet Financial instruments Cash collateral pledged Net amount consolidated balance sheet Financial instruments Cash collateral pledged Net amount (in thousands) Interest rate lock commitments $ 511 $ — $ — $ 511 $ 227 $ — $ — $ 227 Bank of America, N.A. 1,110,861 (1,109,449 ) — 1,412 839,057 (838,771 ) — 286 Credit Suisse Securities (USA) LLC 917,667 (917,667 ) — — 845,567 (845,567 ) — — J.P. Morgan Securities LLC 274,748 (274,748 ) — — 373,186 (373,186 ) — — Deutsche Bank Securities LLC 266,238 (266,238 ) — — 374,526 (374,526 ) — — Daiwa Capital Markets 264,386 (264,077 ) — 309 153,833 (153,730 ) — 103 Morgan Stanley & Co. LLC 231,591 (231,227 ) — 364 164,530 (164,530 ) — — Citigroup Global Markets Inc. 159,593 (159,593 ) — — 235,541 (235,319 ) — 222 RBC Capital Markets, L.P. 93,872 (93,872 ) — — 92,014 (91,805 ) — 209 Wells Fargo Securities, LLC 49,216 (49,216 ) — — 50,360 (50,360 ) — — BNP Paribas 43,612 (43,353 ) — 259 45,411 (45,411 ) — — Goldman Sachs 549 — — 549 164 — — 164 Barclays Capital Inc. — — — — 9,374 (9,299 ) — 75 Other 232 — — 232 20 — — 20 Unamortized debt issuance costs (1,157 ) 1,157 — — (1,618 ) 1,618 — — $ 3,411,919 $ (3,408,283 ) $ — $ 3,636 $ 3,182,192 $ (3,180,886 ) $ — $ 1,306 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: Quarter ended March 31, Derivative activity Income statement line 2018 2017 (in thousands) Interest rate lock commitments Net gain on mortgage loans acquired for sale $ (14,858 ) $ 28,933 Hedged item: Interest rate lock commitments and mortgage loans acquired for sale Net gain on mortgage loans acquired for sale $ 32,810 $ (3,592 ) Mortgage servicing rights Net mortgage loan servicing fees $ (20,848 ) $ (8,698 ) Fixed-rate assets and LIBOR- indexed repurchase agreements Net gain (loss) on investments $ 1,460 $ (4,144 ) CRT agreements Net gain (loss) on investments $ 24,684 $ 20,307 Repurchase agreement derivatives Interest expense $ (12 ) $ —

Real Estate Acquired in Settlem

Real Estate Acquired in Settlement of Loans	3 Months Ended
	Mar. 31, 2018
Banking And Thrift [Abstract]
Real Estate Acquired in Settlement of Loans	Note 10—Real Estate Acquired in Settlement of Loans Following is a summary of financial information relating to REO: Quarter ended March 31, 2018 2017 (in thousands) Balance at beginning of quarter $ 162,865 $ 274,069 Transfers from mortgage loans at fair value and advances 16,363 24,876 Transfer of real estate acquired in settlement of mortgage loans to real estate held for investment (2,059 ) (6,644 ) Results of REO: Valuation adjustments, net (5,359 ) (8,175 ) Gain on sale, net 2,133 3,929 (3,226 ) (4,246 ) Proceeds from sales (32,437 ) (63,224 ) Balance at end of quarter $ 141,506 $ 224,831 March 31, 2018 December 31, 2017 (in thousands) REO pledged to secure assets sold under agreements to repurchase $ 67,720 $ 76,037 REO held in a consolidated subsidiary whose stock is pledged to secure financings of such properties 37,764 48,495 $ 105,484 $ 124,532

Mortgage Servicing Rights

Mortgage Servicing Rights	3 Months Ended
	Mar. 31, 2018
Text Block [Abstract]
Mortgage Servicing Rights	Note 11—Mortgage Servicing Rights Carried at Fair Value: Following is a summary of MSRs carried at fair value: Quarter ended March 31, 2018 2017 (in thousands) Balance at beginning of quarter $ 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 864,494 64,136 Purchases — 62 MSRs resulting from mortgage loan sales 66,546 7,478 Changes in fair value: Due to changes in valuation inputs used in valuation model (1) 52,611 32 Other changes in fair value (2) (26,638 ) (2,025 ) 25,973 (1,993 ) Balance at end of quarter $ 957,013 $ 69,683 March 31, 2018 December 31, 2017 (in thousands) MSRs carried at fair value pledged to secure: Assets sold under agreements to repurchase $ 745,965 $ 66,813 Notes payable 195,721 23,471 $ 941,686 $ 90,284 (1) Principally 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. Carried at Lower of Amortized Cost or Fair Value: Following is a summary of MSRs carried at lower of amortized cost or fair value: Quarter ended March 31, 2018 2017 (in thousands) Amortized Cost: Balance at beginning of quarter $ 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 — 51,210 Amortization — (17,858 ) Balance at end of quarter — 639,455 Valuation Allowance: Balance at beginning of quarter (19,548 ) (13,672 ) Reduction resulting from change in accounting principle 19,548 — Balance after reclassification — (13,672 ) Reversal of impairment valuation allowance — 1,504 Balance at end of quarter — (12,168 ) MSRs, net $ — $ 627,287 Fair value at beginning of quarter $ 626,334 Fair value at end of quarter $ 662,584 December 31, 2017 (in thousands) MSRs carried at lower of cost or fair value pledged to secure: Assets sold under agreements to repurchase $ 584,762 Notes payable 156,846 $ 741,608 Servicing fees relating to MSRs are recorded in Net mortgage loan servicing fees Quarter ended March 31, 2018 2017 (in thousands) Contractually-specified servicing fees $ 48,732 $ 37,281 Ancillary and other fees: Late charges 214 187 Other 1,489 1,037 $ 50,435 $ 38,505

Assets Sold Under Agreements to

Assets Sold Under Agreements to Repurchase	3 Months Ended
	Mar. 31, 2018
Brokers And Dealers [Abstract]
Assets Sold Under Agreements to Repurchase	Note 12—Assets Sold Under Agreements to Repurchase Following is a summary of financial information relating to assets sold under agreements to repurchase: Quarter ended March 31, 2018 2017 (dollars in thousands) Weighted-average interest rate (1) 3.20 % 2.57 % Average balance $ 3,077,914 $ 3,267,864 Total interest expense $ 24,507 $ 22,182 Maximum daily amount outstanding $ 3,655,250 $ 4,330,825 (1) Excludes the effect of amortization of net issuance premiums of $169,000 for the quarter ended March 31, 2018 and net debt issuance costs of $2.3 million for the quarter ended March 31, 2017. March 31, 2018 December 31, 2017 (dollars in thousands) Carrying value: Unpaid principal balance $ 3,409,440 $ 3,182,504 Unamortized debt issuance costs and premiums, net (1,157 ) (1,618 ) $ 3,408,283 $ 3,180,886 Weighted-average interest rate 2.80 % 2.77 % Available borrowing capacity: Committed $ 767,553 $ 749,650 Uncommitted 1,673,718 2,030,607 $ 2,441,271 $ 2,780,257 Margin deposits placed with counterparties included in Other $ 40,114 $ 28,154 Assets securing agreements to repurchase: Mortgage-backed securities $ 1,436,456 $ 989,461 Mortgage loans acquired for sale at fair value $ 1,097,266 $ 1,201,992 Mortgage loans at fair value $ 459,809 $ 760,853 CRT Agreements: Deposits securing CRT agreements $ 392,453 $ 400,778 Derivative assets $ 24,423 $ 26,058 Real estate acquired in settlement of loans $ 105,484 $ 124,532 Real estate held for investment $ 31,899 $ 31,128 MSRs $ 745,965 $ 651,575 Following is a summary of maturities of outstanding assets sold under agreements to repurchase by facility maturity date: Remaining maturity at March 31, 2018 Contractual balance (in thousands) Within 30 days $ 1,373,877 Over 30 to 90 days 1,177,854 Over 90 days to 180 days 231,227 Over 180 days to 1 year 441,442 Over one year to two years 185,040 $ 3,409,440 Weighted average maturity (in months) 3.8 The Company is subject to margin calls during the period the repurchase agreements are outstanding and therefore may be required to repay a portion of the borrowings before the respective repurchase agreements mature if the fair value (as determined by the applicable lender) of the assets securing those repurchase agreements decreases. The amount at risk (the fair value of the assets pledged plus the related margin deposit, less the amount advanced by the counterparty and interest payable) and maturity information relating to the Company’s assets sold under agreements to repurchase is summarized by pledged asset and counterparty below as of March 31, 2018: Mortgage loans acquired for sale, Mortgage loans, REO and MSRs sold under agreements to repurchase Counterparty Amount Weighted-average maturity Facility maturity (in thousands) Credit Suisse First Boston Mortgage Capital LLC $ 468,728 June 18, 2018 April 27, 2018 Bank of America, N.A. $ 10,624 April 14, 2018 May 25, 2018 Citibank, N.A. $ 60,502 April 22, 2018 May 1, 2018 JPMorgan Chase & Co. $ 36,428 March 14, 2019 March 14, 2019 JPMorgan Chase & Co. $ 3,420 May 18, 2018 October 12, 2018 Morgan Stanley $ 11,132 June 17, 2018 August 24, 2018 Deutsche Bank $ 13,282 June 20, 2018 September 30, 2018 Securities sold under agreements to repurchase Counterparty Amount at risk Weighted average maturity (in thousands) Bank of America, N.A. $ 46,492 May 2, 2018 JPMorgan Chase & Co. $ 8,745 April 8, 2018 Daiwa Capital Markets America Inc. $ 18,151 April 20, 2018 Royal Bank of Canada $ 7,640 April 16, 2018 Wells Fargo, N.A. $ 2,670 April 12, 2018 CRT Agreements sold under agreements to repurchase Counterparty Amount at risk Weighted average maturity (in thousands) Credit Suisse First Boston Mortgage Capital LLC $ 51,226 April 16, 2018 Bank of America, N.A. $ 27,592 April 16, 2018 BNP Paribas Corporate & Institutional Banking $ 18,160 April 9, 2018

Mortgage Loan Participation Pur

Mortgage Loan Participation Purchase and Sale Agreements	3 Months Ended
	Mar. 31, 2018
Text Block [Abstract]
Mortgage Loan Participation Purchase and Sale Agreements	Note 13—Mortgage Loan Participation Purchase and Sale Agreements Certain borrowing facilities secured by mortgage 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 mortgage loans that have been pooled with Fannie Mae or Freddie Mac, are sold to a lender pending the securitization of such mortgage loans and the sale of the resulting security. The commitment between the Company and a nonaffiliate to sell such security is also assigned to the lender at the time a participation certificate is sold. The purchase price paid by the lender for each participation certificate is based on the trade price of the security, plus an amount of interest expected to accrue on the security to its anticipated delivery date, minus a present value adjustment, any related hedging costs and a holdback amount. The holdback amount is based on a percentage of the purchase price and is not required to be paid to the Company until the settlement of the security and its delivery to the lender. Mortgage loan participation purchase and sale agreements are summarized below: Quarter ended March 31, 2018 2017 (dollars in thousands) Weighted-average interest rate (1) 2.49 % 2.08 % Average balance $ 45,561 $ 64,498 Total interest expense $ 314 $ 366 Maximum daily amount outstanding $ 77,407 $ 97,404 (1) Excludes the effect of amortization of debt issuance costs of $31,000 for the quarter ended March 31, 2017. There was no amortization of debt issuance costs during the quarter ended March 31, 2018. March 31, 2018 December 31, 2017 (dollars in Carrying value: Amount outstanding $ — $ 44,550 Unamortized debt issuance costs — (62 ) $ — $ 44,488 Weighted-average interest rate — 2.82 % Mortgage loans acquired for sale pledged to secure mortgage loan participation purchase and sale agreements $ — $ 47,285

Notes Payable

Notes Payable	3 Months Ended
	Mar. 31, 2018
Text Block [Abstract]
Notes Payable	Note 14—Notes Payable On March 24, 2017, the Company, through PMC and PMH, entered into a second Amended and Restated Loan and Security Agreement with Citibank, N.A., pursuant to which PMC and PMH finance certain MSRs (inclusive of any related excess servicing spread and/or junior excess strips arising therefrom and that may be transferred from PMC to PMH from time to time) relating to mortgage loans pooled into Fannie Mae securities (collectively, the “Fannie MSRs”) in an aggregate loan amount not to exceed $400 million, all of which is committed. The note was redeemed and terminated in December 2017. On March 24, 2017, the Company, through PMC and PMH, entered into a Loan and Security Agreement with Barclays Bank PLC (“Barclays”), 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 mortgage loans pooled into Freddie Mac securities (collectively, the “Freddie MSRs”), in an aggregate loan amount not to exceed $170 million, all of which is committed. The note matured and was repaid on February 1, 2018. 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 (“Credit Suisse”), 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 mortgage loans pooled into Freddie Mac securities (collectively, the “Freddie MSRs”), in an aggregate loan amount not to exceed $175 million, all of which is committed. The note matures on February 1, 2020. Following is a summary of financial information relating to the notes payable: Quarter ended March 31, 2018 2017 (dollars Weighted-average interest rate (1) — 5.13 % Average balance $ — $ 260,384 Total interest expense $ — $ 4,305 Maximum daily amount outstanding $ — $ 275,106 (1) Excludes the effect of amortization of debt issuance costs of $998,000 for the quarter ended March 31, 2018. March 31, 2018 December 31, 2017 (dollars in thousands) Carrying value: Amount outstanding $ — $ — Unamortized debt issuance costs — — $ — $ — Weighted-average interest rate — — MSRs pledged to secure notes payable $ 195,721 $ 180,317

Asset-Backed Financing of a Var

Asset-Backed Financing of a Variable Interest Entity at Fair Value	3 Months Ended
	Mar. 31, 2018
Text Block [Abstract]
Asset-Backed Financing of a Variable Interest Entity at Fair Value	Note 15—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: Quarter ended March 31, 2018 2017 (dollars in thousands) Weighted-average fair value $ 297,682 $ 347,854 Total interest expense $ 2,296 $ 3,409 Weighted-average effective interest rate 3.54 % 3.48 % March 31, 2018 December 31, 2017 (dollars in thousands) Fair value $ 296,982 $ 307,419 UPB $ 312,730 $ 316,684 Weighted-average interest rate 3.51 % 3.51 % The asset-backed financing of a VIE is a non-recourse liability and 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.

Exchangeable Senior Notes

Exchangeable Senior Notes	3 Months Ended
	Mar. 31, 2018
Text Block [Abstract]
Exchangeable Senior Notes	Note 16—Exchangeable Senior Notes PMC issued in a private offering $250 million aggregate principal amount of exchangeable senior notes (“Exchangeable Notes”) due May 1, 2020. The Exchangeable Notes bear interest at a rate of 5.375% per year, payable semiannually. The 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 Exchangeable Notes as of March 31, 2018, 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 in prior reporting periods, as provided in the related indenture. Following is financial information relating to the Exchangeable Notes: Quarter ended March 31, 2018 2017 (in thousands) Weighted-average UPB $ 250,000 $ 250,000 Total interest expense $ 3,644 $ 3,627 March 31, 2018 December 31, 2017 (in thousands) Carrying value: UPB $ 250,000 $ 250,000 Unamortized debt issuance costs (2,529 ) (2,814 ) $ 247,471 $ 247,186

Liability for Losses Under Repr

Liability for Losses Under Representations and Warranties	3 Months Ended
	Mar. 31, 2018
Text Block [Abstract]
Liability for Losses Under Representations and Warranties	Note 17—Liability for Losses Under Representations and Warranties Following is a summary of the Company’s liability for losses under representations and warranties: Quarter ended March 31, 2018 2017 (in thousands) Balance, beginning of quarter $ 8,678 $ 15,350 Provision for losses: Pursuant to mortgage loan sales 572 673 Reduction in liability due to change in estimate (1,042 ) (4,576 ) Recoveries, net 41 — Balance, end of quarter $ 8,249 $ 11,447 UPB of mortgage loans subject to representations and warranties at end of quarter $ 74,554,838 $ 58,797,849

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 18—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. As of March 31, 2018, the Company was not involved in any such proceedings, claims or legal actions that in the Manager’s view would reasonably be likely to have a material adverse effect on the Company. Commitments The following table summarizes the Company’s outstanding contractual commitments: March 31, 2018 (in thousands) Commitments to purchase mortgage loans acquired for sale $ 1,067,009 Commitments to fund Deposits securing CRT agreements $ 552,957 (1) Certain deposits of cash collateral on CRT Agreements are made upon the first to occur of fulfillment of the aggregation obligation or the lapse of the aggregation period.

Shareholders' Equity

Shareholders' Equity	3 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Shareholders' Equity	Note 19—Shareholders’ Equity Preferred Shares of Beneficial Interest Preferred shares of beneficial interest are summarized below: Series Description (1) Number of shares Liquidation preference Issuance discount Carrying value (in thousands) A 8.125% fixed-to-floating rate cumulative redeemable preferred, issued March 2017 4,600 $ 115,000 $ 3,828 $ 111,172 B 8.00% fixed-to-floating rate cumulative redeemable preferred, issued July 2017 7,800 195,000 6,465 188,535 12,400 $ 310,000 $ 10,293 $ 299,707 (1) Par value is $0.01 per share for both series. 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. The Company paid dividends of $0.51 per Series A Preferred Share during the quarter ended March 31, 2018. The Series A Preferred Shares will not be redeemable before March 15, 2024, 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 of the Company as described in the prospectus supplement filed with the SEC on March 6, 2017. On or after March 15, 2024 or within 120 days of the occurrence of a change in control, the Company may, at its option, redeem any or all of the Series A Preferred Shares at $25.00 per share plus any accumulated and unpaid dividends thereon to, but not including, the redemption date. 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 paid dividends of $0.50 per Series B Preferred Share for the quarter ended March 31, 2018. The Series B Preferred Shares will not be redeemable before June 15, 2024, except in connection with the Company’s qualification as a REIT for U.S. federal income tax purposes and except as described below upon the occurrence of a change of control. On or after June 15, 2024, or 120 days after the first date on which such change of control occurred, the Company may, at its option, redeem any or all of the Series B Preferred Shares at $25.00 per share plus any accumulated and unpaid dividends thereon to, but not including, the redemption date. The Company pays quarterly cumulative dividends on its Preferred Shares on the 15 th 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: Quarter ended March 31, 2018 2017 Cumulative total (1) (in thousands) Common shares repurchased 671 139 14,731 Cost of common shares repurchased $ 10,719 $ 2,307 $ 216,625 (1) Amounts represent the share repurchase program total from its inception in August 2015 through March 31, 2018. 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 of time. 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 payment to the underwriters is subject to a maximum reimbursement in any particular 12-month period of $2.0 million and the maximum amount that may be paid under the agreement is $5.9 million. No payments were made during the quarters ended March 31, 2018, and March 31, 2017. The Reimbursement Agreement expires on February 1, 2019.

Net Gain on Mortgage Loans Acqu

Net Gain on Mortgage Loans Acquired for Sale	3 Months Ended
	Mar. 31, 2018
Text Block [Abstract]
Net Gain on Mortgage Loans Acquired for Sale	Note 20—Net Gain on Mortgage Loans Acquired for Sale Net gain on mortgage loans acquired for sale is summarized below: Quarter ended March 31, 2018 2017 (in thousands) From non-affiliates: Cash loss: Mortgage loans $ (95,767 ) $ (55,907 ) Hedging activities 33,746 16,258 (62,021 ) (39,649 ) Non cash gain: Receipt of MSRs in mortgage loan sale transactions 66,546 58,688 Provision for losses relating to representations and warranties provided in mortgage loan sales: Pursuant to mortgage loans sales (572 ) (673 ) Reduction in liability due to change in estimate 1,042 4,576 Change in fair value of financial instruments held at end of quarter: IRLCs (1,924 ) 4,945 Mortgage loans 2,851 8,587 Hedging derivatives (936 ) (19,850 ) (9 ) (6,318 ) Total from non-affiliates 4,986 16,624 From PFSI—cash gain 2,641 2,401 $ 7,627 $ 19,025

Net Gain (Loss) on Investments

Net Gain (Loss) on Investments	3 Months Ended
	Mar. 31, 2018
Investments Debt And Equity Securities [Abstract]
Net Gain (Loss) on Investments	Note 21—Net Gain (Loss) on Investments Net gain (loss) on investments is summarized below: Quarter ended March 31, 2018 2017 (in thousands) From non-affiliates: Mortgage-backed securities $ (22,397 ) $ 140 Distressed mortgage loans at fair value (9,951 ) 3,216 Mortgage loans held in a VIE at fair value (5,579 ) 316 CRT Agreements 22,551 18,587 Asset-backed financing of a VIE at fair value 6,183 (24 ) Hedging derivatives 1,460 (4,144 ) (7,733 ) 18,091 From PFSI—ESS 7,751 (1,370 ) $ 18 $ 16,721

Net Mortgage Loan Servicing Fee

Net Mortgage Loan Servicing Fees	3 Months Ended
	Mar. 31, 2018
Text Block [Abstract]
Net Mortgage Loan Servicing Fees	Note 22—Net Mortgage Loan Servicing Fees Net mortgage loan servicing fees are summarized below: Quarter ended March 31, 2018 2017 (in thousands) From non-affiliates: Servicing fees (1) $ 48,732 $ 37,281 Ancillary and other fees 1,703 1,224 Effect of MSRs: Carried at fair value—change in fair value 25,973 (1,993 ) Carried at lower of amortized cost or fair value: Amortization — (17,858 ) Additions to impairment valuation allowance — 1,504 Losses on hedging derivatives, net (20,848 ) (8,698 ) 5,125 (27,045 ) 55,560 11,460 From PFSI—MSR recapture income 595 292 Net mortgage loan servicing fees $ 56,155 $ 11,752 Average servicing portfolio $ 73,694,438 $ 57,927,056 (1) Includes contractually specified servicing fees, net of Agency guarantee fees.

Net Interest Income

Net Interest Income	3 Months Ended
	Mar. 31, 2018
Banking And Thrift Interest [Abstract]
Net Interest Income	Note 23—Net Interest Income Net interest income is summarized below: Quarter ended March 31, 2018 2017 (in thousands) Interest income: From nonaffiliates: Short-term investments $ 73 $ 281 Mortgage-backed securities 8,791 6,772 Mortgage loans acquired for sale at fair value 11,332 11,502 Mortgage loans at fair value: Distressed 7,899 19,651 Held in a VIE 2,603 3,729 Placement fees relating to custodial funds 4,215 1,071 Deposits securing CRT Agreements 2,031 408 Other 102 39 37,046 43,453 From PFSI—ESS 3,934 4,647 40,980 48,100 Interest expense: To nonaffiliates: Assets sold under agreements to repurchase (1) 24,507 22,182 Mortgage loan participation purchase and sale agreements 314 366 Notes payable — 4,305 Asset-backed financings of VIEs at fair value 2,296 3,409 Exchangeable Notes 3,644 3,627 Interest shortfall on repayments of mortgage loans serviced for Agency securitizations 1,594 1,062 Interest on mortgage loan impound deposits 485 423 32,840 35,374 To PFSI—Assets sold under agreement to repurchase 1,976 1,805 34,816 37,179 Net interest income $ 6,164 $ 10,921 (1) In 2017, the Company entered into a master repurchase agreement that provides the Company with incentives to finance mortgage loans approved for satisfying certain consumer relief characteristics as provided in the agreement. During the quarter ended March 31, 2018, the Company included $2.4 million of such incentives as a reduction of Interest expense

Share-Based Compensation Plans

Share-Based Compensation Plans	3 Months Ended
	Mar. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Share-Based Compensation Plans	Note 24—Share-Based Compensation Plans As of March 31, 2018 and December 31, 2017, the Company had one share-based compensation plan. The following table summarizes the Company’s share-based compensation activity: Quarter ended March 31, 2018 2017 (in thousands) Grants: Restricted share units 129 134 Performance share units 116 126 Total share units granted 245 260 Grant date fair value: Restricted share units granted $ 2,300 $ 2,281 Performance share units granted 1,542 1,722 Total fair value of share units granted $ 3,842 $ 4,003 Vestings: Restricted share units 192 153 Performance share units 28 — Total share units vested 220 153 Forfeitures: Restricted share units — — Performance share units — — Total share units forfeited — — Compensation expense relating to share-based grants $ 899 $ 1,527

Other Expenses

Other Expenses	3 Months Ended
	Mar. 31, 2018
Other Income And Expenses [Abstract]
Other Expenses	Note 25—Other Expenses Other expenses are summarized below: Quarter ended March 31, 2018 2017 (in thousands) Common overhead allocation from PFSI $ 1,001 $ 1,434 Technology 378 318 Insurance 305 338 Other 966 1,413 $ 2,650 $ 3,503

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Note 26—Income Taxes The Company’s effective tax rate was 25.5% and (27.1)% for the quarters ended March 31, 2018 and 2017, respectively. The Company’s taxable REIT subsidiary (“TRS”) recognized a tax expense of $9.4 million on income of $34.6 million while the Company’s reported consolidated pretax income was $37.8 million for the quarter ended March 31, 2018. For the same periods in 2017, the Company’s TRS recognized tax benefit of $6.6 million on a loss of $14.8 million while the Company’s reported consolidated pretax income was $22.6 million. The relative values between the tax benefit or expense at the TRS and the Company’s consolidated pretax income drive the fluctuation in the effective tax rate. The primary difference between the Company’s effective tax rate and the statutory tax rate is due to nontaxable REIT income resulting from the dividends paid deduction. In general, cash dividends declared by the Company will be considered ordinary income to the shareholders for income tax purposes. Some portion of the dividends may be characterized as capital gain distributions or a return of capital. For tax years beginning after December 31, 2017, the 2017 Tax Cuts and Jobs Act (the “Tax Act”) (subject to certain limitations) provides a 20% deduction from taxable income for ordinary REIT dividends.

Earnings Per Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Earnings Per Share	Note 27—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, reduced by 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: Quarter ended March 31, 2018 2017 (in thousands except per share amounts) Net income $ 28,186 $ 28,737 Dividends on preferred shares (6,234 ) (571 ) Effect of participating securities—share-based compensation awards (202 ) (298 ) Net income attributable to common shareholders $ 21,750 $ 27,868 Net income attributable to common shareholders $ 21,750 $ 27,868 Interest on Exchangeable Notes, net of income taxes 2,655 2,186 Diluted net income attributable to common shareholders $ 24,405 $ 30,054 Weighted-average basic shares outstanding 60,761 66,719 Dilutive securities: Shares issuable under share-based compensation plan 647 — Shares issuable pursuant to exchange of the Exchangeable Notes 8,467 8,467 Diluted weighted-average number of shares outstanding 69,875 75,186 Basic earnings per share $ 0.36 $ 0.42 Diluted earnings per share $ 0.35 $ 0.40 Calculation of diluted earnings per share requires certain potentially dilutive shares to be excluded based on whether 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: Quarter ended March 31, 2018 2017 (in thousands) Shares issuable under share-based compensation plan — 661

Segments

Segments	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Segments	Note 28—Segments The correspondent production segment includes 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 mortgage loans either directly or in the form of mortgage-backed securities. The Credit sensitive investment strategies segment includes investments in distressed mortgage loans, REO, CRT Agreements, non-Agency subordinated bonds and small balance commercial real estate mortgage loans. The Interest rate sensitive strategies segment includes investments in MSRs, ESS, Agency and senior non-Agency MBS and the related interest rate hedging activities. The corporate segment includes certain interest income, management fee and corporate expense amounts. Financial highlights by operating segment are summarized below: Quarter ended March 31, 2018 Correspondent production Credit sensitive strategies Interest rate sensitive strategies Corporate Total (in thousands) Net investment income: Net gain on mortgage loans acquired for sale $ 7,599 $ 28 $ — $ — $ 7,627 Net gain (loss) on investments — 12,414 (12,396 ) — 18 Net mortgage loan servicing fees — 7 56,148 — 56,155 Net interest income: Interest income 11,169 10,208 19,428 175 40,980 Interest expense (6,798 ) (10,664 ) (17,354 ) — (34,816 ) 4,371 (456 ) 2,074 175 6,164 Other income (loss) 7,073 (1,389 ) — 25 5,709 19,043 10,604 45,826 200 75,673 Expenses: Mortgage loan fulfillment and servicing fees payable to PFSI 11,944 3,085 7,934 — 22,963 Management fees — — — 5,696 5,696 Other 469 3,913 108 4,686 9,176 12,413 6,998 8,042 10,382 37,835 Pre-tax income (loss) $ 6,630 $ 3,606 $ 37,784 $ (10,182 ) $ 37,838 Total assets at end of quarter $ 1,141,457 $ 1,485,492 $ 2,989,692 $ 173,845 $ 5,790,486 Quarter ended March 31, 2017 Correspondent production Credit sensitive strategies Interest rate sensitive strategies Corporate Total (in thousands) Net investment income: Net gain on mortgage loans acquired for sale $ 19,011 $ 14 $ — $ — $ 19,025 Net gain (loss) on investments — 21,994 (5,273 ) — 16,721 Net mortgage loan servicing fees — 14 11,738 — 11,752 Net interest income: Interest income 11,357 20,321 16,102 320 48,100 Interest expense (7,901 ) (14,272 ) (15,006 ) — (37,179 ) 3,456 6,049 1,096 320 10,921 Other income (loss) 8,317 (2,268 ) — 6 6,055 30,784 25,803 7,561 326 64,474 Expenses: Mortgage loan fulfillment and servicing fees payable to PFSI 16,575 4,348 6,133 — 27,056 Management fees — — — 5,008 5,008 Other 1,737 2,028 684 5,353 9,802 18,312 6,376 6,817 10,361 41,866 Pre-tax income (loss) $ 12,472 $ 19,427 $ 744 $ (10,035 ) $ 22,608 Total assets at end of quarter $ 1,292,513 $ 2,137,531 $ 2,432,419 $ 140,483 $ 6,002,946

Supplemental Cash Flow Informat

Supplemental Cash Flow Information	3 Months Ended
	Mar. 31, 2018
Supplemental Cash Flow Elements [Abstract]
Supplemental Cash Flow Information	Note 29—Supplemental Cash Flow Information Quarter ended March 31, 2018 2017 (in thousands) Income tax payments, net of refunds $ — $ 31 Interest payments $ 32,112 $ 35,838 Cumulative effect on accumulated deficit of conversion to fair value accounting $ 19,713 $ — Non-cash investing activities: Capitalization of servicing advances pursuant to mortgage loan modifications $ 1,677 $ 6,349 Receipt of excess servicing spread pursuant to recapture agreement with PennyMac Financial Services, Inc. $ 904 $ 1,573 Transfer of mortgage loans and advances to real estate acquired in settlement of loans $ 16,363 $ 24,876 Transfer of real estate acquired in settlement of mortgage loans to real estate held for investment $ 2,059 $ 6,644 Receipt of mortgage servicing rights as proceeds from sales of mortgage loans $ 66,546 $ 58,688 Non-cash financing activities: Recognition of financing premium arising from repurchase agreement derivatives $ 2,164 $ — Dividends declared, not paid $ 28,818 $ 31,652

Regulatory Capital and Liquidit

Regulatory Capital and Liquidity Requirements	3 Months Ended
	Mar. 31, 2018
Mortgage Banking [Abstract]
Regulatory Capital and Liquidity Requirements	Note 30—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 1-4 unit residential mortgage 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. Such Agencies’ capital and liquidity amounts and requirements, the calculations of which are defined by each entity, are summarized below: March 31, 2018 Net Worth (1) Tangible Net Worth / Total Assets Ratio (1) Liquidity (1) Fannie Mae and Freddie Mac Actual Required Actual Required Actual Required (in thousands) (in thousands) March 31, 2018 $ 527,072 $ 190,654 14 % 6 % $ 72,381 $ 26,342 December 31, 2017 $ 487,535 $ 182,818 12 % 6 % $ 73,252 $ 25,245 (1) Calculated in accordance with the Agencies’ requirements. Noncompliance with the Agencies’ capital and liquidity requirements can result in the Agencies taking various remedial actions up to and including removing the Company’s ability to sell loans to and service loans on behalf of the Agencies.

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Note 31—Subsequent Events Management has evaluated all events and transactions through the date the Company issued these consolidated financial statements. During this period: • On April 17, 2018, the Company, through PMC and POP (collectively, the “Sellers”), entered into a master repurchase agreement, by and among Royal Bank of Canada (“RBC”), on the one hand, and the Sellers, on the other hand (the “RBC Repurchase Agreement”), pursuant to which Sellers may sell to, and later repurchase from, RBC newly originated mortgage loans in an aggregate principal amount of up to $100 million. • On April 17, 2018, the Company, through PMC, also entered into an amendment (the “Amendment”) to that certain master repurchase agreement, dated as of August 18, 2017, by and among Deutsche Bank AG, Cayman Islands Branch (“Deutsche Bank”), on the one hand, and PMC, on the other hand (the “DB Repurchase Agreement”), pursuant to which PMC may sell to, and later repurchase from, Deutsche Bank certain residential mortgage loans. The primary purpose of the Amendment was to increase the maximum aggregate principal amount provided for under the DB Repurchase Agreement from $500 million to $750 million. • On April 25, 2018, the Company, through its indirect subsidiary, PMT ISSUER TRUST—FMSR (“FMSR Issuer Trust”), 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 of 1933, as amended. 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 will 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 have been assigned an investment grade rating of BBB- by Kroll Bond Rating Agency and will rank pari passu with the Series 2017-VF1 Notes dated December 20, 2017 (the “FMSR VFN”) issued by FMSR Issuer Trust to PMC and, in turn, pledged by PMC 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 excess servicing spread relating to such MSRs. • All agreements to repurchase assets that matured between March 31, 2018 and the date of this Report were extended or renewed.

Organization and Basis of Prese

Organization and Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Segment Reporting	The Company operates in four segments: correspondent production, credit sensitive strategies, interest rate sensitive strategies and corporate: • 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 mortgage loans either directly or in the form of mortgage-backed securities (“MBS”), using the services of PNMAC Capital Management, LLC (“PCM” or the “Manager”) and PennyMac Loan Services, LLC (“PLS”), both indirect controlled subsidiaries of PennyMac Financial Services, Inc. (“PFSI”). Most of the mortgage loans the Company has acquired in its correspondent production activities have been eligible for sale to government-sponsored entities 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 credit sensitive strategies segment represents the Company’s investments in distressed mortgage loans, real estate acquired in settlement of mortgage loans (“REO”), real estate held for investment, credit risk transfer agreements (“CRT Agreements”), non-Agency subordinated bonds and small balance commercial real estate mortgage loans. • The interest rate sensitive strategies segment represents the Company’s investments in mortgage servicing rights (“MSRs”), excess servicing spread (“ESS”), Agency and senior non-Agency MBS and the related interest rate hedging activities. • The corporate segment includes certain interest income, management fee and corporate expense amounts.
Basis of Presentation	The accompanying 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 The accompanying unaudited consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the financial position, results of operations, and cash flows for the interim periods, but are not necessarily indicative of the results of operations that may be anticipated for the full year. Intercompany accounts and transactions have been eliminated. Preparation of financial statements in compliance with GAAP requires the Manager 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.
Accounting Changes	Mortgage Servicing Rights Effective January 1, 2018, the Company has elected to change the accounting for the classes of MSRs it accounted for using the amortization method through December 31, 2017, to the fair value method as allowed in the Transfers and Servicing
Revenue	Revenue As disclosed in Note 33 – Recently Issued Accounting Pronouncements Receivables, Investments and Debt and Equity Securities, Transfers and Servicing, Financial Instruments Derivatives and Hedging .
Cash Flows	Cash Flows During the quarter ended March 31, 2018, the Company adopted FASB Accounting Standards Update 2016-18, Statement of Cash Flows (Topic 230) – Restricted Cash
Fair Value Measurement	The Company’s consolidated financial statements include assets and liabilities that are measured based on their fair values. Measurement at 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 Manager 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 the asset or liability and are developed based on market data obtained from sources independent of the Company. These may include quoted prices for similar assets or liabilities, interest rates, prepayment speeds, credit risk and other inputs. • 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 assets and liabilities, 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 Manager 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 to their fair values. Likewise, due to the general illiquidity of some of these assets and liabilities, subsequent transactions may be at values significantly different from those reported. Fair Value Accounting Elections The Manager identified all of the Company’s non-cash financial assets and MSRs to be accounted for at fair value. The Manager has elected to account for these assets at fair value so such changes in fair value will be reflected in income as they occur and more timely reflect the results of the Company’s performance. The Manager has also identified the Company’s asset-backed financing of a VIE and interest only security payable at fair value to be accounted for at fair value to reflect the generally offsetting changes in fair value of these borrowings to changes in fair value of assets at fair value collateralizing these financings. For other borrowings, the Manager has determined that historical cost accounting is more appropriate because under this method debt issuance costs are amortized over the term of the debt facility, thereby matching the debt issuance cost to the periods benefiting from the availability of the debt. Before January 1, 2018, originated MSRs backed by mortgage loans with initial interest rates of less than or equal to 4.5% were accounted for using the amortization method. Beginning January 1, 2018, the Company elected to account for all MSRs at fair value prospectively.
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, reduced by 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.

Concentration of Risks (Tables)

Concentration of Risks (Tables)	3 Months Ended
	Mar. 31, 2018
Risks And Uncertainties [Abstract]
Summary of Holdings of Assets Purchased	Most of the distressed mortgage loans and REO has been acquired by the Company in prior years from or through one or more subsidiaries of JPMorgan Chase & Co., Citigroup Inc., and Bank of America Corporation, as presented in the following summary: March 31, 2018 December 31, 2017 (in thousands) JPMorgan Chase & Co. Mortgage loans at fair value $ 185,224 $ 315,437 REO 59,178 66,294 244,402 381,731 Citigroup Inc. Mortgage loans at fair value 181,334 280,488 REO 21,091 26,702 202,425 307,190 Bank of America Corporation Mortgage loans at fair value 86,478 143,969 REO 26,050 27,970 112,528 171,939 $ 559,355 $ 860,860 Total carrying value of distressed mortgage loans at fair value and REO $ 609,893 $ 931,298

Transactions with Related Par41

Transactions with Related Parties (Tables)	3 Months Ended
	Mar. 31, 2018
Related Party Transactions [Abstract]
Summary of Correspondent Production Activity	Following is a summary of correspondent production activity between the Company and PLS: Quarter ended March 31, 2018 2017 (in thousands) Purchases of mortgage loans acquired for sale from PLS $ 781,326 $ 21,530 Mortgage loans fulfillment fees earned by PLS $ 11,944 $ 16,570 UPB of mortgage loans fulfilled by PLS $ 4,225,631 $ 4,631,906 Sourcing fees received from PLS included in Net gain on mortgage loans acquired for sale $ 2,641 $ 2,871 UPB of mortgage loans sold to PLS $ 8,847,873 $ 9,574,717 Early purchase program fees paid to PLS included in Mortgage loan servicing fees $ — $ 5 Tax service fee paid to PLS included in Other $ 1,208 $ 1,379 March 31, 2018 December 31, 2017 (in thousands) Mortgage loans included in Mortgage loans acquired for sale at fair value pending sale to PLS $ 259,673 $ 279,571
Summary of Mortgage Loan Servicing Fees Earned and Mortgage Servicing Rights Recaptured Income Earned	Following is a summary of mortgage loan servicing fees earned by PLS and MSR recapture income earned from PLS: Quarter ended March 31, 2018 2017 (in thousands) Mortgage loans servicing fees: Mortgage loans acquired for sale at fair value: Base $ 56 $ 65 Activity-based 122 143 178 208 Mortgage loans at fair value: Distressed mortgage loans: Base 1,005 1,958 Activity-based 2,080 2,390 3,085 4,348 Mortgage loans held in VIE: Base 34 31 Activity-based — — 34 31 MSRs: Base 7,615 5,806 Activity-based 107 93 7,722 5,899 $ 11,019 $ 10,486 Average investment in: Mortgage loans acquired for sale at fair value $ 1,046,289 $ 1,099,406 Mortgage loans at fair value: Distressed mortgage loans $ 738,333 $ 1,327,421 Mortgage loans held in a VIE $ 314,717 $ 361,110 Average MSR portfolio $ 73,694,438 $ 57,927,056 MSR recapture income recognized included in Net mortgage loan servicing fees - from PennyMac Financial Service, Inc. $ 595 $ 292
Summary of Base Management and Performance Incentive Fees Payable	Following is a summary of the base management and performance incentive fees payable to PCM recorded by the Company: Quarter ended March 31, 2018 2017 (in thousands) Base management $ 5,696 $ 5,008 Performance incentive — — $ 5,696 $ 5,008
Summary of Expenses	Following is a summary of the Company’s reimbursements to PCM and its affiliates for expenses: Quarter ended March 31, 2018 2017 (in thousands) Reimbursement of: Common overhead incurred by PCM and its affiliates $ 1,121 $ 1,434 Expenses incurred on the Company’s behalf, net 573 255 $ 1,694 $ 1,689 Payments and settlements during the quarter (1) $ 7,658 $ 24,393 (1) Payments and settlements include payments and netting settlements made pursuant to master netting agreements between the Company and PFSI for operating, investment and financing activities itemized in this Note.
Summary of Investing Activity	Following is a summary of investing activities between the Company and PFSI: Quarter ended March 31, 2018 2017 (in thousands) ESS: Received pursuant to a recapture agreement $ 904 $ 1,573 Repayments and sales $ 12,291 $ 14,632 Interest income $ 3,934 $ 4,647 Net gain (loss) included in Net gain (loss) on investments: Valuation changes $ 6,921 $ (2,773 ) Recapture income 830 1,403 $ 7,751 $ (1,370 )
Summary Of Financing Transactions	Following is a summary of financing activities between the Company and PFSI: Quarter ended March 31, 2018 2017 (in thousands) Interest expense $ 1,976 $ 1,805 March 31, 2018 December 31, 2017 (in thousands) Assets sold to PFSI under agreement to repurchase $ 142,938 $ 144,128 Conditional Reimbursement payable to PFSI included in Accounts payable and accrued liabilities $ 870 $ 870
Summary of Amounts Receivable From and Payable to PFSI	Amounts receivable from and payable to PFSI are summarized below: March 31, 2018 December 31, 2017 (in thousands) Due from PFSI: MSR recapture receivable $ 207 $ 282 Other 106 3,872 $ 313 $ 4,154 Due to PFSI: Allocated expenses and expenses paid by PFSI on PMT’s behalf $ 8,806 $ 11,542 Management fees 5,696 5,901 Mortgage loan servicing fees 5,562 6,583 Fulfillment fees 4,471 346 Correspondent production fees 1,825 1,735 Conditional Reimbursement 870 870 Interest on Assets sold to PFSI under agreement to repurchase 126 142 $ 27,356 $ 27,119

Loan Sales and Variable Inter42

Loan Sales and Variable Interest Entities (Tables)	3 Months Ended
	Mar. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [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 mortgage loans that are accounted for as sales where the Company maintains continuing involvement with the mortgage loans: Quarter ended March 31, 2018 2017 (in thousands) Cash flows: Proceeds from sales $ 5,200,584 $ 4,858,845 Mortgage loan servicing fees received (1) $ 48,732 $ 37,281 (1) Net of guarantee fees
Summary of Unpaid Balance Information for Mortgage Loans Accounted for Sales	The following table summarizes unpaid principal balance (“UPB”) information for mortgage loans that are accounted for as sales for the dates presented: March 31, 2018 December 31, 2017 (in thousands) UPB of mortgage loans outstanding $ 74,783,511 $ 71,639,351 Delinquent mortgage loans: 30-89 days delinquent $ 360,518 $ 532,673 90 or more days delinquent: Not in foreclosure $ 288,653 $ 280,786 In foreclosure $ 31,989 $ 25,258 Bankruptcy $ 56,032 $ 52,202 Custodial funds managed by the Company (1) $ 1,005,744 $ 879,321 (1) Custodial funds include borrower and investor custodial cash accounts relating to mortgage loans serviced under the servicing agreements and are not recorded on the Company’s consolidated balance sheets. The Company earns placement fees on certain of the custodial funds it manages on behalf of the mortgage loans’ investors, which are included in Interest income
Summary of Credit Risk Transfer Agreements	Following is a summary of the CRT Agreements: Quarter ended March 31, 2018 2017 (in thousands) UPB of mortgage loans sold under CRT Agreements $ 3,210,478 $ 1,834,295 Deposits securing CRT Agreements $ 41,789 $ 15,793 Increase in commitments to fund Deposits securing CRT Agreements resulting from sale of mortgage loans under CRT Agreements $ 70,486 $ 48,150 Interest earned on Deposits securing Agreements $ 2,031 $ 408 Gains recognized on CRT Agreements included in Net gain (loss) on investments Realized $ 19,329 $ 10,288 Resulting from valuation changes 5,355 10,019 24,684 20,307 Change in fair value of interest-only security payable at fair value (2,133 ) (1,720 ) $ 22,551 $ 18,587 Payments made to settle losses $ 828 $ 149 March 31, 2018 December 31, 2017 (in thousands) UPB of mortgage loans subject to credit guarantee obligations $ 29,726,369 $ 26,845,392 Delinquency status (in UPB): Current $ 29,456,524 $ 26,540,953 30—89 days delinquent $ 130,583 $ 179,144 90—180 days delinquent $ 90,418 $ 101,114 180 or more days delinquent $ 26,343 $ 5,146 Foreclosure $ 8,335 $ 5,463 Bankruptcy $ 14,166 $ 13,572 Carrying value of CRT Agreements: Derivative assets $ 103,995 $ 98,640 Deposits securing CRT agreements $ 622,330 $ 588,867 Interest-only security payable at fair value $ 7,796 $ 7,070 CRT Agreement assets pledged to secure assets sold under agreements to repurchase: Deposits securing CRT Agreements $ 392,453 $ 400,778 Derivative assets $ 24,423 $ 26,058 Commitments to fund Deposits securing credit risk transfer agreements $ 552,957 $ 482,471

Fair Value (Tables)

Fair Value (Tables)	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Summary of Financial Statement Items Measured at Fair Value on Recurring Basis	Following is a summary of financial statement items that are measured at fair value on a recurring basis: March 31, 2018 Level 1 Level 2 Level 3 Total (in thousands) Assets: Short-term investments $ 71,044 $ — $ — $ 71,044 Mortgage-backed securities at fair value — 1,436,456 — 1,436,456 Mortgage loans acquired for sale at fair value — 1,107,844 7,690 1,115,534 Mortgage loans at fair value — 311,102 468,387 779,489 Excess servicing spread purchased from PFSI — — 236,002 236,002 Derivative assets: Interest rate lock commitments — — 3,220 3,220 CRT Agreements — — 103,995 103,995 Repurchase agreement derivatives — — 5,892 5,892 Forward purchase contracts 11,400 — 11,400 Forward sale contracts — 6 — 6 MBS put options — 4,086 — 4,086 Call options on interest rate futures 492 — — 492 Put options on interest rate futures 367 — — 367 Total derivative assets before netting 859 15,492 113,107 129,458 Netting — — — (6,940 ) Total derivative assets after netting 859 15,492 113,107 122,518 Mortgage servicing rights at fair value — — 957,013 957,013 $ 71,903 $ 2,870,894 $ 1,782,199 $ 4,718,056 Liabilities: Asset-backed financing of a VIE at fair value $ — $ 296,982 $ — $ 296,982 Interest-only security payable at fair value — — 7,796 7,796 Derivative liabilities: Interest rate lock commitments — — 511 511 Forward purchase contracts — 1 — 1 Forward sales contracts — 8,345 — 8,345 Total derivative liabilities before netting — 8,346 511 8,857 Netting — — — (5,221 ) Total derivative liabilities after netting — 8,346 511 3,636 $ — $ 305,328 $ 8,307 $ 308,414 December 31, 2017 Level 1 Level 2 Level 3 Total (in thousands) Assets: Short-term investments $ 18,398 $ — $ — $ 18,398 Mortgage-backed securities at fair value — 989,461 — 989,461 Mortgage loans acquired for sale at fair value — 1,261,380 8,135 1,269,515 Mortgage loans at fair value — 321,040 768,433 1,089,473 Excess servicing spread purchased from PFSI — — 236,534 236,534 Derivative assets: Interest rate lock commitments — — 4,859 4,859 CRT Agreements — — 98,640 98,640 Repurchase agreement derivatives — — 3,748 3,748 Forward purchase contracts — 4,343 — 4,343 Forward sale contracts — 387 — 387 MBS put options — 3,170 — 3,170 Put options on interest rate futures 656 — — 656 Total derivative assets before netting 656 7,900 107,247 115,803 Netting — — — (1,922 ) Total derivative assets after netting 656 7,900 107,247 113,881 Mortgage servicing rights at fair value — — 91,459 91,459 $ 19,054 $ 2,579,781 $ 1,211,808 $ 3,808,721 Liabilities: Asset-backed financing of a VIE at fair value $ — $ 307,419 $ — $ 307,419 Interest-only security payable at fair value — — 7,070 7,070 Derivative liabilities: Interest rate lock commitments — — 227 227 Forward purchase contracts — 248 — 248 Forward sales contracts — 2,830 — 2,830 Total derivative liabilities before netting — 3,078 227 3,305 Netting — — — (1,999 ) Total derivative liabilities after netting — 3,078 227 1,306 $ — $ 310,497 $ 7,297 $ 315,795
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: Quarter ended March 31, 2018 Mortgage loans acquired for sale at fair value Mortgage loans at fair value Excess servicing spread Interest rate lock commitments (1) CRT Agreements Repurchase agreement derivatives Mortgage servicing rights Total (in thousands) Assets: 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 2,831 — — 4,609 — 2,164 — 9,604 Repayments and sales (3,539 ) (272,513 ) (12,291 ) — (19,329 ) (8 ) — (307,680 ) Capitalization of interest — 2,180 3,934 — — — — 6,114 Capitalization of advances — 1,677 — — — — — 1,677 ESS received pursuant to a recapture agreement with PFSI — — 904 — — — — 904 Servicing received as proceeds from sales of mortgage loans — — — — — — 66,546 66,546 Changes in fair value included in income arising from: Changes in instrument-specific credit risk — 2,681 — — — — — 2,681 Other factors 103 (12,632 ) 6,921 (19,467 ) 24,684 (12 ) 25,973 25,570 103 (9,951 ) 6,921 (19,467 ) 24,684 (12 ) 25,973 28,251 Transfers of mortgage loans to REO and real estate held for investment — (21,439 ) — — — — — (21,439 ) Transfers of mortgage loans acquired for sale at fair value from "Level 2" to "Level 3" (2) 160 — — — — — — 160 Transfers of interest rate lock commitments to mortgage loans acquired for sale — — — 12,935 — — — 12,935 Balance, March 31, 2018 $ 7,690 $ 468,387 $ 236,002 $ 2,709 $ 103,995 $ 5,892 $ 957,013 $ 1,781,688 Changes in fair value recognized during the quarter relating to assets still held at March 31, 2018 $ (14 ) $ (9,040 ) $ 6,921 $ 2,709 $ 5,355 $ 77 $ 25,973 $ 31,981 (1) For the purpose of this table, the interest rate lock commitment (“IRLC”) asset and liability positions are shown net. (2) During the quarter ended March 31, 2018, the Manager identified certain “Level 2” fair value mortgage loans that were not salable into the prime mortgage market and therefore transferred them to “Level 3”. Quarter ended March 31, 2018 Interest-only security payable (in thousands) Liabilities: Balance, December 31, 2017 $ 7,070 Changes in fair value included in income arising from: Changes in instrument-specific credit risk — Other factors 726 726 Balance, March 31, 2018 $ 7,796 Changes in fair value recognized during the quarter relating to liability outstanding at March 31, 2018 $ 726 Quarter ended March 31, 2017 Mortgage Excess Interest Mortgage loans servicing rate lock CRT servicing at fair value spread commitments (1) Agreements rights Total (in thousands) Assets: Balance, December 31, 2016 $ 1,354,572 $ 288,669 $ 3,777 $ 15,610 $ 64,136 $ 1,726,764 Purchases and issuances — — 17,762 — 62 17,824 Repayments and sales (113,576 ) (14,632 ) — (10,288 ) — (138,496 ) Capitalization of interest 9,903 4,647 — — — 14,550 Capitalization of advances 6,349 — — — — 6,349 ESS received pursuant to a recapture agreement with PFSI — 1,573 — — — 1,573 Servicing received as proceeds from sales of mortgage loans — — — — 7,478 7,478 Changes in fair value included in income arising from: Changes in instrument-specific credit risk 4,970 — — — — 4,970 Other factors (1,754 ) (2,773 ) 11,171 20,307 (1,993 ) 24,958 3,216 (2,773 ) 11,171 20,307 (1,993 ) 29,928 Transfers of mortgage loans to REO and real estate held for investment (30,911 ) — — — — (30,911 ) Transfers of interest rate lock commitments to mortgage loans acquired for sale — — (23,989 ) — — (23,989 ) Balance, March 31, 2017 $ 1,229,553 $ 277,484 $ 8,721 $ 25,629 $ 69,683 $ 1,611,070 Changes in fair value recognized during the quarter relating to assets still held at March 31, 2017 $ 485 $ (2,773 ) $ 8,721 $ 10,019 $ (1,993 ) $ 14,459 (1) For the purpose of this table, the IRLC asset and liability positions are shown net. Quarter ended March 31, 2017 Interest-only security payable (in thousands) Liabilities: Balance, December 31, 2016 $ 4,114 Changes in fair value included in income arising from: Changes in instrument-specific credit risk — Other factors 487 487 Balance, March 31, 2017 $ 4,601 Changes in fair value recognized during the quarter relating to liability outstanding at March 31, 2017 $ 487
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 mortgage loans accounted for under the fair value option (including mortgage loans acquired for sale, mortgage loans held in a consolidated VIE, and distressed mortgage loans at fair value): March 31, 2018 December 31, 2017 Fair value Principal amount due upon maturity Difference Fair value Principal amount due upon maturity Difference (in thousands) Mortgage loans acquired for sale at fair value: Current through 89 days delinquent: $ 1,114,282 $ 1,084,121 $ 30,161 $ 1,268,121 $ 1,221,125 $ 46,996 90 or more days delinquent: Not in foreclosure 606 725 (119 ) 950 1,120 (170 ) In foreclosure 646 683 (37 ) 444 496 (52 ) 1,252 1,408 (156 ) 1,394 1,616 (222 ) $ 1,115,534 $ 1,085,529 $ 30,005 $ 1,269,515 $ 1,222,741 $ 46,774 Mortgage loans at fair value: Mortgage loans held in a consolidated VIE: Current through 89 days delinquent: $ 311,102 $ 312,730 $ (1,628 ) $ 321,040 $ 316,684 $ 4,356 90 or more days delinquent: Not in foreclosure — — — — — — In foreclosure — — — — — — — — — — — — 311,102 312,730 (1,628 ) 321,040 316,684 4,356 Distressed mortgage loans at fair value: Current through 89 days delinquent: 263,263 334,185 (70,922 ) 414,785 519,009 (104,224 ) 90 or more days delinquent: Not in foreclosure 97,971 155,224 (57,253 ) 166,749 257,038 (90,289 ) In foreclosure 107,153 156,812 (49,659 ) 186,899 267,911 (81,012 ) 205,124 312,036 (106,912 ) 353,648 524,949 (171,301 ) 468,387 646,221 (177,834 ) 768,433 1,043,958 (275,525 ) $ 779,489 $ 958,951 $ (179,462 ) $ 1,089,473 $ 1,360,642 $ (271,169 )
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: Quarter ended March 31, 2018 Net gain on Net mortgage mortgage loans Net gain loan Net acquired (loss) on servicing interest for sale investments fees income Total (in thousands) Assets: Short-term investments $ — $ — $ — $ — $ — Mortgage-backed securities at fair value — (22,397 ) — 440 (21,957 ) Mortgage loans acquired for sale at fair value (23,678 ) — — — (23,678 ) Mortgage loans at fair value — (15,530 ) — 1,774 (13,756 ) ESS at fair value — 6,921 — 3,934 10,855 MSRs at fair value — — 25,973 — 25,973 $ (23,678 ) $ (31,006 ) $ 25,973 $ 6,148 $ (22,563 ) Liabilities: Interest-only security payable $ — $ 726 $ — $ — $ 726 Asset-backed financing of a VIE at fair value — 6,183 — 339 6,522 $ — $ 6,909 $ — $ 339 $ 7,248 Quarter ended March 31, 2017 Net gain on Net mortgage mortgage loans Net gain loan Net acquired on servicing interest for sale investments fees income Total (in thousands) Assets: Short-term investments $ — $ — $ — $ — $ — Mortgage-backed securities at fair value — 140 — (1,318 ) (1,178 ) Mortgage loans acquired for sale at fair value 14,158 — — — 14,158 Mortgage loans at fair value — 3,532 — 10,201 13,733 ESS at fair value — (2,773 ) — 4,647 1,874 MSRs at fair value — — (1,993 ) — (1,993 ) $ 14,158 $ 899 $ (1,993 ) $ 13,530 $ 26,594 Liabilities: Interest-only security payable $ — $ (487 ) $ — $ — $ (487 ) Asset-backed financing of a VIE at fair value — (24 ) — (387 ) (411 ) $ — $ (511 ) $ — $ (387 ) $ (898 )
Summary of Carrying Value of Financial Statement Items Re-measured at Fair Value on Nonrecurring Basis	Following is a summary of the carrying value at year end for financial statement items that were re-measured at fair value on a nonrecurring basis during the periods presented: March 31, 2018 Level 1 Level 2 Level 3 Total (in thousands) Real estate acquired in settlement of loans $ — $ — $ 57,675 $ 57,675 $ — $ — $ 57,675 $ 57,675 December 31, 2017 Level 1 Level 2 Level 3 Total (in thousands) Real estate acquired in settlement of loans $ — $ — $ 71,380 $ 71,380 MSRs at lower of amortized cost or fair value — — 312,995 312,995 $ — $ — $ 384,375 $ 384,375
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 period on assets held at period end that were remeasured at fair value on a nonrecurring basis: Quarter ended March 31, 2018 2017 (in thousands) Real estate asset acquired in settlement of loans $ (4,769 ) $ (7,060 ) MSRs at lower of amortized cost or fair value — 1,504 $ (4,769 ) $ (5,556 )
Quantitative Summary of Key Inputs Used in Valuation of Mortgage Loans at Fair Value (Excluding Loans Held in a VIE)	Following is a quantitative summary of key inputs used in the valuation of mortgage loans at fair value (excluding loans held in a VIE): Key inputs March 31, 2018 December 31, 2017 Discount rate Range 3.2% – 15.0% 2.9% – 15.0% Weighted average 6.7% 6.9% Twelve-month projected housing price index change Range 2.2% – 3.3% 3.6% – 4.6% Weighted average 3.1% 4.4% Prepayment speed (1) Range 3.1% – 6.6% 3.2% – 11.0% Weighted average 4.2% 4.2% Total prepayment speed (2) Range 10.6% – 22.8% 10.8% – 23.8% Weighted average 16.2% 16.5% (1) Prepayment speed is measured using Life Voluntary Conditional Prepayment Rate (“CPR”). (2) 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: Key inputs March 31, 2018 December 31, 2017 UPB of underlying mortgage loans (in thousands) $ 26,236,839 $ 27,217,199 Average servicing fee rate (in basis points) 34 34 Average ESS rate (in basis points) 19 19 Pricing spread (1) Range 3.6% - 4.1% 3.8% - 4.3% Weighted average 3.9% 4.1% Annual total prepayment speed (2) Range 8.0% - 52.4% 8.4% - 41.4% Weighted average 9.9% 10.8% Life (in years) Range 1.1 - 7.8 1.4 - 7.7 Weighted average 6.8 6.5 (1) Pricing spread represents a margin that is applied to a reference interest rate’s forward rate curve to develop periodic discount rates. The Company applies a pricing spread to the United States Dollar London Interbank Offered Rate (“LIBOR”) curve for purposes of discounting cash flows relating to ESS. (2) Prepayment speed is measured using Life Total CPR.
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: Key inputs March 31, 2018 December 31, 2017 Pull-through rate Range 57.5% – 100% 58.0% - 100% Weighted average 88.0% 90.3% MSR value expressed as Servicing fee multiple Range 2.6 - 5.9 2.1 - 5.8 Weighted average 4.7 4.9 Percentage of UPB Range 0.0% – 2.6% 0.0% - 2.4% Weighted average 1.2% 1.3%
Quantitative Summary of Key Unobservable Inputs Used in Valuation of CRT Agreements	Following is a quantitative summary of key unobservable inputs used in the valuation of CRT Agreements: Key inputs March 31, 2018 December 31, 2017 Discount rate Range 5.6% – 6.6% 5.1% – 6.2% Weighted average 6.1% 5.6% Voluntary Prepayment speed (1) Range 8.6% – 10.4% 12.1% – 15.0% Weighted average 9.1% 13.0% Involuntary prepayment speed (2) Range 0.3% – 0.3% 0.3% – 0.3% Weighted average 0.3% 0.3% (1) Voluntary prepayment speed is measured using Life Voluntary CPR. (2) Involuntary prepayment speed is measured using Life Involuntary CPR.
Key Assumptions Used in Determining Fair Value of MSRs at Time of Initial Recognition	Following are the key inputs used in determining the fair value of MSRs at the time of initial recognition: Quarter ended March 31, 2018 2017 Fair value Amortized cost Fair value (MSR recognized and UPB of underlying mortgage loan amounts in thousands) MSR recognized $ 66,546 $ 51,210 $ 7,478 Key inputs UPB of underlying mortgage loans $ 5,114,741 $ 4,092,267 $ 660,586 Weighted-average annual servicing fee rate (in basis points) 26 25 25 Pricing spread (1) Range 7.4% – 12.6% 7.6% – 12.6% 7.6% – 7.6% Weighted average 7.5% 7.6% 7.6% Annual total prepayment speed (2) Range 3.2% – 22.8% 3.2% – 28.7% 7.9% – 20.7% Weighted average 8.1% 7.5% 10.9% Life (in years) Range 3.5 - 11.9 2.7 – 11.9 4.0 – 8.5 Weighted average 8.4 8.3 7.2 Annual per-loan cost of servicing Range $79 - $79 $79 – $79 $79 – $79 Weighted average $79 $79 $79 (1) The Company applies a pricing spread to the United States Dollar LIBOR curve for purposes of discounting cash flows relating to MSRs. (2) Prepayment speed is measured using Life Total CPR.
Quantitative Summary of Key Assumptions Used in Valuation of MSRs as of Dates Presented, and Effect on Estimated Fair Value from Adverse Changes in Those Inputs	Following is a quantitative summary of key inputs used in the valuation of MSRs as of the dates presented, and the effect on the fair value from adverse changes in those inputs: March 31, 2018 December 31, 2017 Fair value Amortized cost Fair value (Carrying value, UPB of underlying mortgage loans and effect on fair value amounts in thousands) Carrying value $ 957,013 $ 753,322 $ 91,459 Key inputs: UPB of underlying mortgage loans $ 75,261,574 $ 63,853,606 $ 8,273,696 Weighted-average annual servicing fee rate (in basis points) 25 25 25 Weighted-average note interest rate 4.0% 3.9% 4.7% Pricing spread (1) Range 7.4% – 13.1% 7.6% – 13.1% 7.6% – 12.6% Weighted average 7.4% 7.6% 7.6% Effect on fair value of (2): 5% adverse change $(14,450) $(11,848) $(1,347) 10% adverse change $(28,487) $(23,352) $(2,655) 20% adverse change $(55,385) $(45,379) $(5,162) Prepayment speed (3) Range 6.5% – 27.2% 7.1% – 27.1% 7.3% – 20.9% Weighted average 8.0% 8.4% 11.1% Life (in years) Range 2.9 - 8.3 2.9 - 8.0 3.1 - 6.8 Weighted average 7.9 7.6 6.8 Effect on fair value of (2): 5% adverse change $(13,939) $(12,267) $(1,954) 10% adverse change $(27,417) $(24,120) $(3,827) 20% adverse change $(53,083) $(46,668) $(7,352) Annual per-loan cost of servicing Range $77 - $79 $78 – $79 $77 – $79 Weighted average $79 $79 $79 Effect on fair value of (2): 5% adverse change $(6,962) $(5,721) $(744) 10% adverse change $(13,925) $(11,441) $(1,488) 20% adverse change $(27,849) $(22,883) $(2,976) (1) The Company applies a pricing spread to the United States Dollar LIBOR curve for purposes of discounting cash flows relating to MSRs. (2) For MSRs carried at fair value, an adverse change in one of the above-mentioned key inputs is expected to result in a recognized reduction in fair value which will be recorded in income. For MSRs carried at lower of amortized cost or fair value, an adverse change in one of the above-mentioned key inputs may have resulted in recognition of MSR impairment. The extent of the recognized MSR impairment depended on the relationship of fair value to the carrying value of such MSRs. (3) Prepayment speed is measured using Life Total CPR.

Mortgage Loans Acquired for S44

Mortgage Loans Acquired for Sale at Fair Value (Tables)	3 Months Ended
	Mar. 31, 2018
Mortgage Loans On Real Estate [Abstract]
Summary of Distribution of Company's Mortgage Loans Acquired for Sale at Fair Value	Mortgage loans acquired for sale at fair value is comprised of recently originated mortgage loans purchased by the Company for resale. Following is a summary of the distribution of the Company’s mortgage loans acquired for sale at fair value: Loan type March 31, 2018 December 31, 2017 (in thousands) Conventional: Agency-eligible $ 837,994 $ 971,910 Held for sale to PLS — Government insured or guaranteed 259,673 279,571 Commercial real estate 10,177 9,898 Repurchased pursuant to representations and warranties 7,690 8,136 $ 1,115,534 $ 1,269,515 Mortgage loans pledged to secure: Assets sold under agreements to repurchase $ 1,097,266 $ 1,201,992 Mortgage loan participation purchase and sale agreements — 47,285 $ 1,097,266 $ 1,249,277

Mortgage Loans at Fair Value (T

Mortgage Loans at Fair Value (Tables)	3 Months Ended
	Mar. 31, 2018
Text Block [Abstract]
Summary of Distribution of Company's Mortgage Loans at Fair Value	Following is a summary of the distribution of the Company’s mortgage loans at fair value: March 31, 2018 December 31, 2017 Loan type Fair value Unpaid principal balance Fair value Unpaid principal balance (in thousands) Distressed mortgage loans: Nonperforming mortgage loans $ 205,124 $ 312,036 $ 353,648 $ 524,949 Performing mortgage loans: Interest rate step-up 137,451 181,412 189,724 242,335 Fixed interest rate 102,605 128,737 186,929 236,840 Adjustable-rate/hybrid 23,207 24,036 38,132 39,834 263,263 334,185 414,785 519,009 468,387 646,221 768,433 1,043,958 Fixed interest rate jumbo mortgage loans held in a VIE 311,102 312,730 321,040 316,684 $ 779,489 $ 958,951 $ 1,089,473 $ 1,360,642 Mortgage loans at fair value pledged to secure: Assets sold under agreements to repurchase $ 459,809 $ 760,853 Asset-backed financing of a VIE at fair value 311,102 321,040 $ 770,911 $ 1,081,893
Summary of Certain Concentrations of Credit Risk in Portfolio of Distressed Mortgage Loans at Fair Value	Following is a summary of certain concentrations of credit risk in the portfolio of distressed mortgage loans at fair value: Concentration March 31, 2018 December 31, 2017 (percentages are of fair value) Portion of mortgage loans originated between 2005 and 2007 73% 73% Mortgage loans with unpaid-principal balance-to-current -property-value in excess of 100% 38% 38% States contributing 5% or more of mortgage loans New York California New Jersey Florida Massachusetts New York California New Jersey Florida Massachusetts

Derivative Activities (Tables)

Derivative Activities (Tables)	3 Months Ended
	Mar. 31, 2018
Derivative Assets and Liabilities Recorded within Derivative Assets and Derivative Liabilities and Related Margin Deposits Recorded in Other Assets	The Company had the following derivative assets and liabilities recorded within Derivative assets Derivative liabilities Other March 31, 2018 December 31, 2017 Fair value Fair value Notional Derivative Derivative Notional Derivative Derivative Instrument amount assets liabilities amount assets liabilities (in thousands) Derivatives not designated as hedging instruments: Not subject to master netting arrangements: Interest rate lock commitments 1,067,009 $ 3,220 $ 511 1,250,803 $ 4,859 $ 227 CRT Agreements 29,726,369 103,995 — 26,845,392 98,640 — Repurchase agreement derivatives 5,892 — 3,748 — Subject to master netting agreements ─ for hedging purposes: Forward purchase contracts 2,510,700 11,400 1 1,996,235 4,343 248 Forward sale contracts 2,297,802 6 8,345 2,565,271 387 2,830 MBS put options 1,750,000 4,086 — 2,375,000 3,170 — Call options on interest rate futures 150,000 492 — — — — Put options on interest rate futures 275,000 367 — 550,000 656 — Swap futures — — — 275,000 — — Bond futures 450,000 — — — — — Eurodollar future contracts 847,664 — — 937,000 — — Total derivative instruments before netting 129,458 8,857 115,803 3,305 Netting (6,940 ) (5,221 ) (1,922 ) (1,999 ) $ 122,518 $ 3,636 $ 113,881 $ 1,306 Margin deposits (received from) placed with derivatives counterparties included in Other assets ( ) $ (1,718 ) $ 76 Derivative assets pledged to secure assets sold under agreements to repurchase $ 24,423 $ 26,058
Summary of Net Derivative Assets	Following is a summary of net derivative assets: March 31, 2018 December 31, 2017 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: Interest rate lock commitments $ 3,220 $ — $ 3,220 $ 4,859 $ — $ 4,859 CRT Agreement derivatives 103,995 — 103,995 98,640 — 98,640 Repurchase agreement derivatives 5,892 — 5,892 3,748 — 3,748 113,107 — 113,107 107,247 — 107,247 Subject to master netting arrangements: Forward purchase contracts 11,400 — 11,400 4,343 — 4,343 Forward sale contracts 6 — 6 387 — 387 MBS put options 4,086 — 4,086 3,170 — 3,170 Call options on interest rate futures 492 — 492 — — — Put options on interest rate futures 367 — 367 656 — 656 Netting — (6,940 ) (6,940 ) — (1,922 ) (1,922 ) 16,351 (6,940 ) 9,411 8,556 (1,922 ) 6,634 $ 129,458 $ (6,940 ) $ 122,518 $ 115,803 $ (1,922 ) $ 113,881
Summary of Derivative Assets, Financial Instruments and Collateral Held by Counterparty	The following table summarizes by significant counterparty the amount of derivative asset positions after considering master netting arrangements and financial instruments or cash pledged that do not meet the accounting guidance qualifying for setoff accounting: March 31, 2018 December 31, 2017 Net amount of assets presented in the Gross amounts not offset in the consolidated balance sheet Net amount of assets presented in the Gross amounts not offset in the consolidated balance sheet consolidated balance sheet Financial instruments Cash collateral received Net amount consolidated balance sheet Financial instruments Cash collateral received Net amount (in thousands) CRT Agreements $ 103,995 $ — $ — $ 103,995 $ 98,640 $ — $ — $ 98,640 Interest rate lock commitments 3,220 — — 3,220 4,859 — — 4,859 J.P. Morgan Securities LLC 6,294 — — 6,294 2,020 — — 2,020 Deutsche Bank Securities LLC 5,892 — — 5,892 3,748 — — 3,748 Federal National Mortgage Association 1,073 — — 1,073 1,606 — — 1,606 RJ O’Brien & Associates, LLC 859 — — 859 656 — — 656 Barclays Capital Inc. 324 — — 324 — — — — Credit Suisse Securities (USA) LLC 227 — — 227 809 — — 809 Mitsubishi UFJ Sec 155 — — 155 193 — — 193 RBC Capital Markets, L.P. 151 — — 151 — — — — KGS Alpha Capital Markets LP 131 — — 131 — — — — PNC Capital Markets LLC 100 — — 100 — — — — Wells Fargo Securities, LLC 90 — — 90 146 — — 146 Morgan Stanley & Co. LLC — — — — 457 — — 457 Citigroup Global Markets Inc. — — — — 429 — — 429 Jefferies & Company, Inc. — — — — 160 — — 160 Other 7 — — 7 158 — — 158 $ 122,518 $ — $ — $ 122,518 $ 113,881 $ — $ — $ 113,881
Schedule of Offsetting of Derivative Liabilities and Financial Liabilities	Following is a summary of net derivative liabilities and assets sold under agreements to repurchase. Assets sold under agreements to repurchase do not qualify for setoff accounting. March 31, 2018 December 31, 2017 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 $ 511 $ — $ 511 $ 227 $ — $ 227 511 — 511 227 — 227 Subject to master netting arrangements: Forward purchase contracts 1 — 1 248 — 248 Forward sales contracts 8,345 — 8,345 2,830 — 2,830 Netting — (5,221 ) (5,221 ) — (1,999 ) (1,999 ) 8,346 (5,221 ) 3,125 3,078 (1,999 ) 1,079 8,857 (5,221 ) 3,636 3,305 (1,999 ) 1,306 Assets sold under agreements to repurchase: UPB 3,409,440 — 3,409,440 3,182,504 — 3,182,504 Unamortized debt issuance costs (1,157 ) — (1,157 ) (1,618 ) — (1,618 ) 3,408,283 — 3,408,283 3,180,886 — 3,180,886 $ 3,417,140 $ (5,221 ) $ 3,411,919 $ 3,184,191 $ (1,999 ) $ 3,182,192
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 meet the accounting guidance qualifying for setoff accounting. All assets sold under agreements to repurchase represent sufficient collateral or exceed the liability amount recorded on the consolidated balance sheet. March 31, 2018 December 31, 2017 Net amount of liabilities presented in the Gross amounts not offset in the consolidated balance sheet Net amount of liabilities presented in the Gross amounts not offset in the consolidated balance sheet consolidated balance sheet Financial instruments Cash collateral pledged Net amount consolidated balance sheet Financial instruments Cash collateral pledged Net amount (in thousands) Interest rate lock commitments $ 511 $ — $ — $ 511 $ 227 $ — $ — $ 227 Bank of America, N.A. 1,110,861 (1,109,449 ) — 1,412 839,057 (838,771 ) — 286 Credit Suisse Securities (USA) LLC 917,667 (917,667 ) — — 845,567 (845,567 ) — — J.P. Morgan Securities LLC 274,748 (274,748 ) — — 373,186 (373,186 ) — — Deutsche Bank Securities LLC 266,238 (266,238 ) — — 374,526 (374,526 ) — — Daiwa Capital Markets 264,386 (264,077 ) — 309 153,833 (153,730 ) — 103 Morgan Stanley & Co. LLC 231,591 (231,227 ) — 364 164,530 (164,530 ) — — Citigroup Global Markets Inc. 159,593 (159,593 ) — — 235,541 (235,319 ) — 222 RBC Capital Markets, L.P. 93,872 (93,872 ) — — 92,014 (91,805 ) — 209 Wells Fargo Securities, LLC 49,216 (49,216 ) — — 50,360 (50,360 ) — — BNP Paribas 43,612 (43,353 ) — 259 45,411 (45,411 ) — — Goldman Sachs 549 — — 549 164 — — 164 Barclays Capital Inc. — — — — 9,374 (9,299 ) — 75 Other 232 — — 232 20 — — 20 Unamortized debt issuance costs (1,157 ) 1,157 — — (1,618 ) 1,618 — — $ 3,411,919 $ (3,408,283 ) $ — $ 3,636 $ 3,182,192 $ (3,180,886 ) $ — $ 1,306
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: Quarter ended March 31, Derivative activity Income statement line 2018 2017 (in thousands) Interest rate lock commitments Net gain on mortgage loans acquired for sale $ (14,858 ) $ 28,933 Hedged item: Interest rate lock commitments and mortgage loans acquired for sale Net gain on mortgage loans acquired for sale $ 32,810 $ (3,592 ) Mortgage servicing rights Net mortgage loan servicing fees $ (20,848 ) $ (8,698 ) Fixed-rate assets and LIBOR- indexed repurchase agreements Net gain (loss) on investments $ 1,460 $ (4,144 ) CRT agreements Net gain (loss) on investments $ 24,684 $ 20,307 Repurchase agreement derivatives Interest expense $ (12 ) $ —
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 to hedge the Company’s MBS, inventory of mortgage loans acquired for sale, mortgage loans at fair value held in a VIE, IRLCs and MSRs. Quarter ended March 31, 2018 Amount, Amount, beginning Dispositions/ end Instrument of quarter Additions expirations of quarter (in thousands) Forward purchase contracts 1,996,235 19,833,104 (19,318,639 ) 2,510,700 Forward sales contracts 2,565,271 24,410,334 (24,677,803 ) 2,297,802 MBS put options 2,375,000 4,125,000 (4,750,000 ) 1,750,000 Call options on interest rate futures — 150,000 — 150,000 Put options on interest rate futures 550,000 3,325,000 (3,600,000 ) 275,000 Swap futures 275,000 — (275,000 ) — Bond futures — 450,000 — 450,000 Eurodollar future sale contracts 937,000 114,597 (203,933 ) 847,664 Quarter ended March 31, 2017 Amount, Amount, beginning Dispositions/ end Instrument of quarter Additions expirations of quarter (in thousands) Forward purchase contracts 4,840,707 18,906,029 (19,631,577 ) 4,115,159 Forward sales contracts 6,148,242 24,225,103 (24,699,931 ) 5,673,414 MBS put options 925,000 1,400,000 (1,375,000 ) 950,000 MBS call options 750,000 — (750,000 ) — Call options on interest rate futures 200,000 62,500 — 262,500 Put options on interest rate futures 550,000 1,750,000 (1,800,000 ) 500,000 Swap futures 150,000 300,000 (300,000 ) 150,000 Eurodollar future sale contracts 1,351,000 101,000 (212,000 ) 1,240,000 Treasury future buy contracts — 49,300 (49,300 ) — Treasury future sale contracts — 49,300 (49,300 ) —

Real Estate Acquired in Settl47

Real Estate Acquired in Settlement of Loans (Tables)	3 Months Ended
	Mar. 31, 2018
Banking And Thrift [Abstract]
Summary of Financial Information Relating to REO	Following is a summary of financial information relating to REO: Quarter ended March 31, 2018 2017 (in thousands) Balance at beginning of quarter $ 162,865 $ 274,069 Transfers from mortgage loans at fair value and advances 16,363 24,876 Transfer of real estate acquired in settlement of mortgage loans to real estate held for investment (2,059 ) (6,644 ) Results of REO: Valuation adjustments, net (5,359 ) (8,175 ) Gain on sale, net 2,133 3,929 (3,226 ) (4,246 ) Proceeds from sales (32,437 ) (63,224 ) Balance at end of quarter $ 141,506 $ 224,831 March 31, 2018 December 31, 2017 (in thousands) REO pledged to secure assets sold under agreements to repurchase $ 67,720 $ 76,037 REO held in a consolidated subsidiary whose stock is pledged to secure financings of such properties 37,764 48,495 $ 105,484 $ 124,532

Mortgage Servicing Rights (Tabl

Mortgage Servicing Rights (Tables)	3 Months Ended
	Mar. 31, 2018
Summary of MSRs Carried at Fair Value	Following is a summary of MSRs carried at fair value: Quarter ended March 31, 2018 2017 (in thousands) Balance at beginning of quarter $ 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 864,494 64,136 Purchases — 62 MSRs resulting from mortgage loan sales 66,546 7,478 Changes in fair value: Due to changes in valuation inputs used in valuation model (1) 52,611 32 Other changes in fair value (2) (26,638 ) (2,025 ) 25,973 (1,993 ) Balance at end of quarter $ 957,013 $ 69,683 March 31, 2018 December 31, 2017 (in thousands) MSRs carried at fair value pledged to secure: Assets sold under agreements to repurchase $ 745,965 $ 66,813 Notes payable 195,721 23,471 $ 941,686 $ 90,284 (1) Principally 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 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: Quarter ended March 31, 2018 2017 (in thousands) Amortized Cost: Balance at beginning of quarter $ 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 — 51,210 Amortization — (17,858 ) Balance at end of quarter — 639,455 Valuation Allowance: Balance at beginning of quarter (19,548 ) (13,672 ) Reduction resulting from change in accounting principle 19,548 — Balance after reclassification — (13,672 ) Reversal of impairment valuation allowance — 1,504 Balance at end of quarter — (12,168 ) MSRs, net $ — $ 627,287 Fair value at beginning of quarter $ 626,334 Fair value at end of quarter $ 662,584 December 31, 2017 (in thousands) MSRs carried at lower of cost or fair value pledged to secure: Assets sold under agreements to repurchase $ 584,762 Notes payable 156,846 $ 741,608
Mortgage service rights [Member]
Summary of Net Mortgage Loan Servicing Fees Relating to MSRs	Servicing fees relating to MSRs are recorded in Net mortgage loan servicing fees Quarter ended March 31, 2018 2017 (in thousands) Contractually-specified servicing fees $ 48,732 $ 37,281 Ancillary and other fees: Late charges 214 187 Other 1,489 1,037 $ 50,435 $ 38,505

Assets Sold Under Agreements 49

Assets Sold Under Agreements to Repurchase (Tables)	3 Months Ended
	Mar. 31, 2018
Summary of Financial Information Relating to Assets Sold under Agreements to Repurchase	Following is a summary of financial information relating to assets sold under agreements to repurchase: Quarter ended March 31, 2018 2017 (dollars in thousands) Weighted-average interest rate (1) 3.20 % 2.57 % Average balance $ 3,077,914 $ 3,267,864 Total interest expense $ 24,507 $ 22,182 Maximum daily amount outstanding $ 3,655,250 $ 4,330,825 (1) Excludes the effect of amortization of net issuance premiums of $169,000 for the quarter ended March 31, 2018 and net debt issuance costs of $2.3 million for the quarter ended March 31, 2017. March 31, 2018 December 31, 2017 (dollars in thousands) Carrying value: Unpaid principal balance $ 3,409,440 $ 3,182,504 Unamortized debt issuance costs and premiums, net (1,157 ) (1,618 ) $ 3,408,283 $ 3,180,886 Weighted-average interest rate 2.80 % 2.77 % Available borrowing capacity: Committed $ 767,553 $ 749,650 Uncommitted 1,673,718 2,030,607 $ 2,441,271 $ 2,780,257 Margin deposits placed with counterparties included in Other $ 40,114 $ 28,154 Assets securing agreements to repurchase: Mortgage-backed securities $ 1,436,456 $ 989,461 Mortgage loans acquired for sale at fair value $ 1,097,266 $ 1,201,992 Mortgage loans at fair value $ 459,809 $ 760,853 CRT Agreements: Deposits securing CRT agreements $ 392,453 $ 400,778 Derivative assets $ 24,423 $ 26,058 Real estate acquired in settlement of loans $ 105,484 $ 124,532 Real estate held for investment $ 31,899 $ 31,128 MSRs $ 745,965 $ 651,575
Summary of Maturities of Outstanding Assets Sold under Agreements to Repurchase by Facility Maturity Date	Following is a summary of maturities of outstanding assets sold under agreements to repurchase by facility maturity date: Remaining maturity at March 31, 2018 Contractual balance (in thousands) Within 30 days $ 1,373,877 Over 30 to 90 days 1,177,854 Over 90 days to 180 days 231,227 Over 180 days to 1 year 441,442 Over one year to two years 185,040 $ 3,409,440 Weighted average maturity (in months) 3.8
Summary of Assets Sold under Agreements to Repurchase by Counterparty	Securities sold under agreements to repurchase Counterparty Amount at risk Weighted average maturity (in thousands) Bank of America, N.A. $ 46,492 May 2, 2018 JPMorgan Chase & Co. $ 8,745 April 8, 2018 Daiwa Capital Markets America Inc. $ 18,151 April 20, 2018 Royal Bank of Canada $ 7,640 April 16, 2018 Wells Fargo, N.A. $ 2,670 April 12, 2018
CRT Agreements sold under agreements to repurchase [Member]
Summary of Assets Sold under Agreements to Repurchase by Counterparty	CRT Agreements sold under agreements to repurchase Counterparty Amount at risk Weighted average maturity (in thousands) Credit Suisse First Boston Mortgage Capital LLC $ 51,226 April 16, 2018 Bank of America, N.A. $ 27,592 April 16, 2018 BNP Paribas Corporate & Institutional Banking $ 18,160 April 9, 2018
Mortgage loans acquired for sale, mortgage loans, REO and MSRs sold under agreements to repurchase [Member]
Summary of Assets Sold under Agreements to Repurchase by Counterparty	Mortgage loans acquired for sale, Mortgage loans, REO and MSRs sold under agreements to repurchase Counterparty Amount Weighted-average maturity Facility maturity (in thousands) Credit Suisse First Boston Mortgage Capital LLC $ 468,728 June 18, 2018 April 27, 2018 Bank of America, N.A. $ 10,624 April 14, 2018 May 25, 2018 Citibank, N.A. $ 60,502 April 22, 2018 May 1, 2018 JPMorgan Chase & Co. $ 36,428 March 14, 2019 March 14, 2019 JPMorgan Chase & Co. $ 3,420 May 18, 2018 October 12, 2018 Morgan Stanley $ 11,132 June 17, 2018 August 24, 2018 Deutsche Bank $ 13,282 June 20, 2018 September 30, 2018

Mortgage Loan Participation P50

Mortgage Loan Participation Purchase and Sale Agreements (Tables)	3 Months Ended
	Mar. 31, 2018
Text Block [Abstract]
Summary of Mortgage Loan Participation Purchase and Sale Agreements	Mortgage loan participation purchase and sale agreements are summarized below: Quarter ended March 31, 2018 2017 (dollars in thousands) Weighted-average interest rate (1) 2.49 % 2.08 % Average balance $ 45,561 $ 64,498 Total interest expense $ 314 $ 366 Maximum daily amount outstanding $ 77,407 $ 97,404 (1) Excludes the effect of amortization of debt issuance costs of $31,000 for the quarter ended March 31, 2017. There was no amortization of debt issuance costs during the quarter ended March 31, 2018. March 31, 2018 December 31, 2017 (dollars in Carrying value: Amount outstanding $ — $ 44,550 Unamortized debt issuance costs — (62 ) $ — $ 44,488 Weighted-average interest rate — 2.82 % Mortgage loans acquired for sale pledged to secure mortgage loan participation purchase and sale agreements $ — $ 47,285

Notes Payable (Tables)

Notes Payable (Tables)	3 Months Ended
	Mar. 31, 2018
Text Block [Abstract]
Summary of Financial Information Relating to Note Payable	Following is a summary of financial information relating to the notes payable: Quarter ended March 31, 2018 2017 (dollars Weighted-average interest rate (1) — 5.13 % Average balance $ — $ 260,384 Total interest expense $ — $ 4,305 Maximum daily amount outstanding $ — $ 275,106 (1) Excludes the effect of amortization of debt issuance costs of $998,000 for the quarter ended March 31, 2018. March 31, 2018 December 31, 2017 (dollars in thousands) Carrying value: Amount outstanding $ — $ — Unamortized debt issuance costs — — $ — $ — Weighted-average interest rate — — MSRs pledged to secure notes payable $ 195,721 $ 180,317

Asset-Backed Financing of a V52

Asset-Backed Financing of a Variable Interest Entity at Fair Value (Tables)	3 Months Ended
	Mar. 31, 2018
Text Block [Abstract]
Summary of Financial Information Relating to Asset-Backed Financing of a VIE	Following is a summary of financial information relating to the asset-backed financing of a VIE: Quarter ended March 31, 2018 2017 (dollars in thousands) Weighted-average fair value $ 297,682 $ 347,854 Total interest expense $ 2,296 $ 3,409 Weighted-average effective interest rate 3.54 % 3.48 % March 31, 2018 December 31, 2017 (dollars in thousands) Fair value $ 296,982 $ 307,419 UPB $ 312,730 $ 316,684 Weighted-average interest rate 3.51 % 3.51 %

Exchangeable Senior Notes (Tabl

Exchangeable Senior Notes (Tables)	3 Months Ended
	Mar. 31, 2018
Text Block [Abstract]
Summary of Financial Information Relating to Exchangeable Notes	Following is financial information relating to the Exchangeable Notes: Quarter ended March 31, 2018 2017 (in thousands) Weighted-average UPB $ 250,000 $ 250,000 Total interest expense $ 3,644 $ 3,627 March 31, 2018 December 31, 2017 (in thousands) Carrying value: UPB $ 250,000 $ 250,000 Unamortized debt issuance costs (2,529 ) (2,814 ) $ 247,471 $ 247,186

Liability for Losses Under Re54

Liability for Losses Under Representations and Warranties (Tables)	3 Months Ended
	Mar. 31, 2018
Text Block [Abstract]
Summary of Company's Liability for Losses under Representations and Warranties	Following is a summary of the Company’s liability for losses under representations and warranties: Quarter ended March 31, 2018 2017 (in thousands) Balance, beginning of quarter $ 8,678 $ 15,350 Provision for losses: Pursuant to mortgage loan sales 572 673 Reduction in liability due to change in estimate (1,042 ) (4,576 ) Recoveries, net 41 — Balance, end of quarter $ 8,249 $ 11,447 UPB of mortgage loans subject to representations and warranties at end of quarter $ 74,554,838 $ 58,797,849

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
Company's Outstanding Contractual Commitments	The following table summarizes the Company’s outstanding contractual commitments: March 31, 2018 (in thousands) Commitments to purchase mortgage loans acquired for sale $ 1,067,009 Commitments to fund Deposits securing CRT agreements $ 552,957 (1) Certain deposits of cash collateral on CRT Agreements are made upon the first to occur of fulfillment of the aggregation obligation or the lapse of the aggregation period.

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	3 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Schedule of Preferred Shares of Beneficial Interest	Preferred shares of beneficial interest are summarized below: Series Description (1) Number of shares Liquidation preference Issuance discount Carrying value (in thousands) A 8.125% fixed-to-floating rate cumulative redeemable preferred, issued March 2017 4,600 $ 115,000 $ 3,828 $ 111,172 B 8.00% fixed-to-floating rate cumulative redeemable preferred, issued July 2017 7,800 195,000 6,465 188,535 12,400 $ 310,000 $ 10,293 $ 299,707 (1) Par value is $0.01 per share for both series.
Summary of Share Repurchase Activity	The following table summarizes the Company’s share repurchase activity: Quarter ended March 31, 2018 2017 Cumulative total (1) (in thousands) Common shares repurchased 671 139 14,731 Cost of common shares repurchased $ 10,719 $ 2,307 $ 216,625 (1) Amounts represent the share repurchase program total from its inception in August 2015 through March 31, 2018.

Net Gain on Mortgage Loans Ac57

Net Gain on Mortgage Loans Acquired for Sale (Tables)	3 Months Ended
	Mar. 31, 2018
Text Block [Abstract]
Summary of Net Gain on Mortgage Loans Acquired for Sale	Net gain on mortgage loans acquired for sale is summarized below: Quarter ended March 31, 2018 2017 (in thousands) From non-affiliates: Cash loss: Mortgage loans $ (95,767 ) $ (55,907 ) Hedging activities 33,746 16,258 (62,021 ) (39,649 ) Non cash gain: Receipt of MSRs in mortgage loan sale transactions 66,546 58,688 Provision for losses relating to representations and warranties provided in mortgage loan sales: Pursuant to mortgage loans sales (572 ) (673 ) Reduction in liability due to change in estimate 1,042 4,576 Change in fair value of financial instruments held at end of quarter: IRLCs (1,924 ) 4,945 Mortgage loans 2,851 8,587 Hedging derivatives (936 ) (19,850 ) (9 ) (6,318 ) Total from non-affiliates 4,986 16,624 From PFSI—cash gain 2,641 2,401 $ 7,627 $ 19,025

Net Gain (Loss) on Investments

Net Gain (Loss) on Investments (Tables)	3 Months Ended
	Mar. 31, 2018
Investments Debt And Equity Securities [Abstract]
Summary of Net Gain (Loss) on Investments	Net gain (loss) on investments is summarized below: Quarter ended March 31, 2018 2017 (in thousands) From non-affiliates: Mortgage-backed securities $ (22,397 ) $ 140 Distressed mortgage loans at fair value (9,951 ) 3,216 Mortgage loans held in a VIE at fair value (5,579 ) 316 CRT Agreements 22,551 18,587 Asset-backed financing of a VIE at fair value 6,183 (24 ) Hedging derivatives 1,460 (4,144 ) (7,733 ) 18,091 From PFSI—ESS 7,751 (1,370 ) $ 18 $ 16,721

Net Mortgage Loan Servicing F59

Net Mortgage Loan Servicing Fees (Tables)	3 Months Ended
	Mar. 31, 2018
Text Block [Abstract]
Summary of Net Mortgage Loan Servicing Fees	Net mortgage loan servicing fees are summarized below: Quarter ended March 31, 2018 2017 (in thousands) From non-affiliates: Servicing fees (1) $ 48,732 $ 37,281 Ancillary and other fees 1,703 1,224 Effect of MSRs: Carried at fair value—change in fair value 25,973 (1,993 ) Carried at lower of amortized cost or fair value: Amortization — (17,858 ) Additions to impairment valuation allowance — 1,504 Losses on hedging derivatives, net (20,848 ) (8,698 ) 5,125 (27,045 ) 55,560 11,460 From PFSI—MSR recapture income 595 292 Net mortgage loan servicing fees $ 56,155 $ 11,752 Average servicing portfolio $ 73,694,438 $ 57,927,056 (1) Includes contractually specified servicing fees, net of Agency guarantee fees.

Net Interest Income (Tables)

Net Interest Income (Tables)	3 Months Ended
	Mar. 31, 2018
Banking And Thrift Interest [Abstract]
Summary of Net Interest Income	Net interest income is summarized below: Quarter ended March 31, 2018 2017 (in thousands) Interest income: From nonaffiliates: Short-term investments $ 73 $ 281 Mortgage-backed securities 8,791 6,772 Mortgage loans acquired for sale at fair value 11,332 11,502 Mortgage loans at fair value: Distressed 7,899 19,651 Held in a VIE 2,603 3,729 Placement fees relating to custodial funds 4,215 1,071 Deposits securing CRT Agreements 2,031 408 Other 102 39 37,046 43,453 From PFSI—ESS 3,934 4,647 40,980 48,100 Interest expense: To nonaffiliates: Assets sold under agreements to repurchase (1) 24,507 22,182 Mortgage loan participation purchase and sale agreements 314 366 Notes payable — 4,305 Asset-backed financings of VIEs at fair value 2,296 3,409 Exchangeable Notes 3,644 3,627 Interest shortfall on repayments of mortgage loans serviced for Agency securitizations 1,594 1,062 Interest on mortgage loan impound deposits 485 423 32,840 35,374 To PFSI—Assets sold under agreement to repurchase 1,976 1,805 34,816 37,179 Net interest income $ 6,164 $ 10,921

Share-Based Compensation Plans

Share-Based Compensation Plans (Tables)	3 Months Ended
	Mar. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Summary of Share-Based Compensation Activity	The following table summarizes the Company’s share-based compensation activity: Quarter ended March 31, 2018 2017 (in thousands) Grants: Restricted share units 129 134 Performance share units 116 126 Total share units granted 245 260 Grant date fair value: Restricted share units granted $ 2,300 $ 2,281 Performance share units granted 1,542 1,722 Total fair value of share units granted $ 3,842 $ 4,003 Vestings: Restricted share units 192 153 Performance share units 28 — Total share units vested 220 153 Forfeitures: Restricted share units — — Performance share units — — Total share units forfeited — — Compensation expense relating to share-based grants $ 899 $ 1,527

Other Expenses (Tables)

Other Expenses (Tables)	3 Months Ended
	Mar. 31, 2018
Other Income And Expenses [Abstract]
Summary of Other Expenses	Other expenses are summarized below: Quarter ended March 31, 2018 2017 (in thousands) Common overhead allocation from PFSI $ 1,001 $ 1,434 Technology 378 318 Insurance 305 338 Other 966 1,413 $ 2,650 $ 3,503

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Summary of Basic and Diluted Earnings per Share	The following table summarizes the basic and diluted earnings per share calculations: Quarter ended March 31, 2018 2017 (in thousands except per share amounts) Net income $ 28,186 $ 28,737 Dividends on preferred shares (6,234 ) (571 ) Effect of participating securities—share-based compensation awards (202 ) (298 ) Net income attributable to common shareholders $ 21,750 $ 27,868 Net income attributable to common shareholders $ 21,750 $ 27,868 Interest on Exchangeable Notes, net of income taxes 2,655 2,186 Diluted net income attributable to common shareholders $ 24,405 $ 30,054 Weighted-average basic shares outstanding 60,761 66,719 Dilutive securities: Shares issuable under share-based compensation plan 647 — Shares issuable pursuant to exchange of the Exchangeable Notes 8,467 8,467 Diluted weighted-average number of shares outstanding 69,875 75,186 Basic earnings per share $ 0.36 $ 0.42 Diluted earnings per share $ 0.35 $ 0.40
Summary of Potentially Dilutive Shares Excluded from Computation of Diluted Earnings Per Share	Quarter ended March 31, 2018 2017 (in thousands) Shares issuable under share-based compensation plan — 661

Segments (Tables)

Segments (Tables)	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Financial Highlights by Operating Segment	Financial highlights by operating segment are summarized below: Quarter ended March 31, 2018 Correspondent production Credit sensitive strategies Interest rate sensitive strategies Corporate Total (in thousands) Net investment income: Net gain on mortgage loans acquired for sale $ 7,599 $ 28 $ — $ — $ 7,627 Net gain (loss) on investments — 12,414 (12,396 ) — 18 Net mortgage loan servicing fees — 7 56,148 — 56,155 Net interest income: Interest income 11,169 10,208 19,428 175 40,980 Interest expense (6,798 ) (10,664 ) (17,354 ) — (34,816 ) 4,371 (456 ) 2,074 175 6,164 Other income (loss) 7,073 (1,389 ) — 25 5,709 19,043 10,604 45,826 200 75,673 Expenses: Mortgage loan fulfillment and servicing fees payable to PFSI 11,944 3,085 7,934 — 22,963 Management fees — — — 5,696 5,696 Other 469 3,913 108 4,686 9,176 12,413 6,998 8,042 10,382 37,835 Pre-tax income (loss) $ 6,630 $ 3,606 $ 37,784 $ (10,182 ) $ 37,838 Total assets at end of quarter $ 1,141,457 $ 1,485,492 $ 2,989,692 $ 173,845 $ 5,790,486 Quarter ended March 31, 2017 Correspondent production Credit sensitive strategies Interest rate sensitive strategies Corporate Total (in thousands) Net investment income: Net gain on mortgage loans acquired for sale $ 19,011 $ 14 $ — $ — $ 19,025 Net gain (loss) on investments — 21,994 (5,273 ) — 16,721 Net mortgage loan servicing fees — 14 11,738 — 11,752 Net interest income: Interest income 11,357 20,321 16,102 320 48,100 Interest expense (7,901 ) (14,272 ) (15,006 ) — (37,179 ) 3,456 6,049 1,096 320 10,921 Other income (loss) 8,317 (2,268 ) — 6 6,055 30,784 25,803 7,561 326 64,474 Expenses: Mortgage loan fulfillment and servicing fees payable to PFSI 16,575 4,348 6,133 — 27,056 Management fees — — — 5,008 5,008 Other 1,737 2,028 684 5,353 9,802 18,312 6,376 6,817 10,361 41,866 Pre-tax income (loss) $ 12,472 $ 19,427 $ 744 $ (10,035 ) $ 22,608 Total assets at end of quarter $ 1,292,513 $ 2,137,531 $ 2,432,419 $ 140,483 $ 6,002,946

Supplemental Cash Flow Inform65

Supplemental Cash Flow Information (Tables)	3 Months Ended
	Mar. 31, 2018
Supplemental Cash Flow Elements [Abstract]
Summary of Supplemental Cash Flow Information	Quarter ended March 31, 2018 2017 (in thousands) Income tax payments, net of refunds $ — $ 31 Interest payments $ 32,112 $ 35,838 Cumulative effect on accumulated deficit of conversion to fair value accounting $ 19,713 $ — Non-cash investing activities: Capitalization of servicing advances pursuant to mortgage loan modifications $ 1,677 $ 6,349 Receipt of excess servicing spread pursuant to recapture agreement with PennyMac Financial Services, Inc. $ 904 $ 1,573 Transfer of mortgage loans and advances to real estate acquired in settlement of loans $ 16,363 $ 24,876 Transfer of real estate acquired in settlement of mortgage loans to real estate held for investment $ 2,059 $ 6,644 Receipt of mortgage servicing rights as proceeds from sales of mortgage loans $ 66,546 $ 58,688 Non-cash financing activities: Recognition of financing premium arising from repurchase agreement derivatives $ 2,164 $ — Dividends declared, not paid $ 28,818 $ 31,652

Regulatory Capital and Liquid66

Regulatory Capital and Liquidity Requirements (Tables)	3 Months Ended
	Mar. 31, 2018
Mortgage Banking [Abstract]
Summary of Capital and Liquidity Amounts and Requirements by Agencies	Such Agencies’ capital and liquidity amounts and requirements, the calculations of which are defined by each entity, are summarized below: March 31, 2018 Net Worth (1) Tangible Net Worth / Total Assets Ratio (1) Liquidity (1) Fannie Mae and Freddie Mac Actual Required Actual Required Actual Required (in thousands) (in thousands) March 31, 2018 $ 527,072 $ 190,654 14 % 6 % $ 72,381 $ 26,342 December 31, 2017 $ 487,535 $ 182,818 12 % 6 % $ 73,252 $ 25,245 (1) Calculated in accordance with the Agencies’ requirements.

Organization - Additional Infor

Organization - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2018Segment
Accounting Policies [Abstract]
Number of business segments	4
Percentage of taxable income for distributions	90.00%

Basis of Presentation and Acc68

Basis of Presentation and Accounting Changes - Additional Information (Detail) - Accounting Standards Update 2014-11 Transfers and Servicing [Member] $ in Millions	Jan. 01, 2018USD ($)
Basis Of Pesentation And Accounting Changes [Line Items]
Change in accounting principle, increase in income taxes payable	$ 5.3
Change in accounting principle, increase in shareholders equity	14.4
MSRs [Member]
Basis Of Pesentation And Accounting Changes [Line Items]
Change in accounting principle, increase in investment	$ 19.7

Concentration of Risks - Summar

Concentration of Risks - Summary of Holdings of Assets Purchased (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Investment portfolio purchases through one or more subsidiaries of Citigroup Inc. and JPMorgan Chase & Co. as of:
Investment portfolio purchases above through one or more subsidiaries total	$ 559,355	$ 860,860
Total carrying value of distressed mortgage loans at fair value and REO	609,893	931,298
Assets Purchased From JPMorgan Chase & Co [Member]
Investment portfolio purchases through one or more subsidiaries of Citigroup Inc. and JPMorgan Chase & Co. as of:
Investment portfolio purchases above through one or more subsidiaries Mortgage loans at fair value	185,224	315,437
Investment portfolio purchases above through one or more subsidiaries REO	59,178	66,294
Investment portfolio purchases above through one or more subsidiaries total	244,402	381,731
Assets Purchased from Citigroup [Member]
Investment portfolio purchases through one or more subsidiaries of Citigroup Inc. and JPMorgan Chase & Co. as of:
Investment portfolio purchases above through one or more subsidiaries Mortgage loans at fair value	181,334	280,488
Investment portfolio purchases above through one or more subsidiaries REO	21,091	26,702
Investment portfolio purchases above through one or more subsidiaries total	202,425	307,190
Assets Purchased from Bank of America Corporation [Member]
Investment portfolio purchases through one or more subsidiaries of Citigroup Inc. and JPMorgan Chase & Co. as of:
Investment portfolio purchases above through one or more subsidiaries Mortgage loans at fair value	86,478	143,969
Investment portfolio purchases above through one or more subsidiaries REO	26,050	27,970
Investment portfolio purchases above through one or more subsidiaries total	$ 112,528	$ 171,939

Transactions with Related Par70

Transactions with Related Parties - Correspondent Production Activities - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2018USD ($)
Mortgage Loans On Real Estate [Line Items]
Servicing agreement expiration date	Sep. 12, 2020
Renewal period of servicing agreement	18 months
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%
Penny Mac Loan Services Llc | Fannie Mae Or Freddie Mac Mortgage Loans | Maximum [Member]
Mortgage Loans On Real Estate [Line Items]
Basis point for monthly fulfillment fee	0.35%
Penny Mac Loan Services Llc | 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 Par71

Transactions with Related Parties - Summary of Correspondent Production Activity (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Related Party Transaction [Line Items]
Purchases of mortgage loans acquired for sale from PLS	$ 781,326	$ 21,530
Mortgage loans fulfillment fees earned by PLS	11,944	16,570
Mortgage loans included in Mortgage loans acquired for sale at fair value pending sale to PLS	1,115,534		$ 1,269,515
PennyMac Loan Services, LLC [Member]
Related Party Transaction [Line Items]
Purchases of mortgage loans acquired for sale from PLS	781,326	21,530
Mortgage loans fulfillment fees earned by PLS	11,944	16,570
UPB of mortgage loans fulfilled by PLS	4,225,631	4,631,906
Sourcing fees received from PLS included in Net gain on mortgage loans acquired for sale	2,641	2,871
UPB of mortgage loans sold to PLS	8,847,873	9,574,717
Early purchase program fees paid to PLS included in Mortgage loan servicing fees	0	5
Tax service fee paid to PLS included in Other expense	1,208	$ 1,379
Mortgage loans included in Mortgage loans acquired for sale at fair value pending sale to PLS	$ 259,673		$ 279,571

Transactions with Related Par72

Transactions with Related Parties - Mortgage Loan Servicing Activities - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2018USD ($)
Mortgage Loans On Real Estate [Line Items]
Servicing agreement expiration date	Sep. 12, 2020
Renewal period of servicing agreement	18 months
Penny Mac Loan Services Llc
Mortgage Loans On Real Estate [Line Items]
Base servicing fees for REO per month	$ 75
REO rental fee	30
Lease renewal fee for REO	$ 100
Rental income percentage gross	9.00%
Penny Mac Loan Services Llc | Distressed mortgage loans [Member]
Mortgage Loans On Real Estate [Line Items]
Base servicing fees for REO per month	$ 75
Activity based fees	$ 500
Services agreement fees collection period	18 months
Penny Mac Loan Services Llc | Distressed mortgage loans [Member] | Minimum [Member]
Mortgage Loans On Real Estate [Line Items]
Base servicing fees per month	$ 30
Activity based fees	750
Penny Mac Loan Services Llc | Distressed mortgage loans [Member] | Maximum [Member]
Mortgage Loans On Real Estate [Line Items]
Base servicing fees per month	85
Activity based fees	1,750
Penny Mac Loan Services Llc | Subserviced loan [Member] | Fixed-Rate Mortgage Loans [Member]
Mortgage Loans On Real Estate [Line Items]
Base servicing fees per month	7.50
Penny Mac Loan Services Llc | Subserviced loan [Member] | Adjustable rate mortgage loans [Member]
Mortgage Loans On Real Estate [Line Items]
Base servicing fees per month	8.50
Penny Mac Loan Services Llc | Non-Distressed Mortgage Loans [Member]
Mortgage Loans On Real Estate [Line Items]
Base servicing fees for REO per month	75
Penny Mac Loan Services Llc | Non-Distressed Mortgage Loans [Member] | Minimum [Member]
Mortgage Loans On Real Estate [Line Items]
Additional servicing fees per loan per month	10
Penny Mac Loan Services Llc | Non-Distressed Mortgage Loans [Member] | Maximum [Member]
Mortgage Loans On Real Estate [Line Items]
Additional servicing fees per loan per month	55
Penny Mac Loan Services Llc | Whole loans [Member]
Mortgage Loans On Real Estate [Line Items]
Supplemental fee received per month	$ 25
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 Par73

Transactions with Related Parties - Summary of Mortgage Loan Servicing Fees Earned and Mortgage Servicing Rights Recaptured Income Earned (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Related Party Transaction [Line Items]
Mortgage loan servicing fees	$ 11,019	$ 10,486
Average MSR portfolio	73,694,438	57,927,056
PennyMac Loan Services, LLC [Member]
Related Party Transaction [Line Items]
Mortgage loan servicing fees	11,019	10,486
Average MSR portfolio	73,694,438	57,927,056
MSR recapture income recognized included in Net mortgage loan servicing fees - from PennyMac Financial Service, Inc.	595	292
PennyMac Loan Services, LLC [Member] | Mortgage loans acquired for sale at fair value [Member]
Related Party Transaction [Line Items]
Mortgage loan servicing fees	178	208
Average MSR portfolio	1,046,289	1,099,406
PennyMac Loan Services, LLC [Member] | Distressed mortgage loans [Member]
Related Party Transaction [Line Items]
Mortgage loan servicing fees	3,085	4,348
Average MSR portfolio	738,333	1,327,421
PennyMac Loan Services, LLC [Member] | Mortgage loans held in VIE [Member]
Related Party Transaction [Line Items]
Mortgage loan servicing fees	34	31
Average MSR portfolio	314,717	361,110
PennyMac Loan Services, LLC [Member] | Mortgage servicing rights [Member]
Related Party Transaction [Line Items]
Mortgage loan servicing fees	7,722	5,899
PennyMac Loan Services, LLC [Member] | Base [Member] | Mortgage loans acquired for sale at fair value [Member]
Related Party Transaction [Line Items]
Mortgage loan servicing fees	56	65
PennyMac Loan Services, LLC [Member] | Base [Member] | Distressed mortgage loans [Member]
Related Party Transaction [Line Items]
Mortgage loan servicing fees	1,005	1,958
PennyMac Loan Services, LLC [Member] | Base [Member] | Mortgage loans held in VIE [Member]
Related Party Transaction [Line Items]
Mortgage loan servicing fees	34	31
PennyMac Loan Services, LLC [Member] | Base [Member] | Mortgage servicing rights [Member]
Related Party Transaction [Line Items]
Mortgage loan servicing fees	7,615	5,806
PennyMac Loan Services, LLC [Member] | Activity-based [Member] | Mortgage loans acquired for sale at fair value [Member]
Related Party Transaction [Line Items]
Mortgage loan servicing fees	122	143
PennyMac Loan Services, LLC [Member] | Activity-based [Member] | Distressed mortgage loans [Member]
Related Party Transaction [Line Items]
Mortgage loan servicing fees	2,080	2,390
PennyMac Loan Services, LLC [Member] | Activity-based [Member] | Mortgage loans held in VIE [Member]
Related Party Transaction [Line Items]
Mortgage loan servicing fees	0	0
PennyMac Loan Services, LLC [Member] | Activity-based [Member] | Mortgage servicing rights [Member]
Related Party Transaction [Line Items]
Mortgage loan servicing fees	$ 107	$ 93

Transactions with Related Par74

Transactions with Related Parties - Management Fees - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2018	Aug. 04, 2009
PNMAC Capital Management LLC [Member]
Mortgage Loans On Real Estate [Line Items]
Percentage of change in net income due to quarterly adjustments	8.00%
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 calculated quarterly and is equal to: (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 Par75

Transactions with Related Parties - Summary of Base Management and Performance Incentive Fees Payable (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Related Party Transaction [Line Items]
Total management fee incurred during the period	$ 5,696	$ 5,008
PNMAC Capital Management LLC [Member]
Related Party Transaction [Line Items]
Total management fee incurred during the period	5,696	5,008
PNMAC Capital Management LLC [Member] | Base [Member]
Related Party Transaction [Line Items]
Total management fee incurred during the period	5,696	5,008
PNMAC Capital Management LLC [Member] | Performance incentive [Member]
Related Party Transaction [Line Items]
Total management fee incurred during the period	$ 0	$ 0

Transactions with Related Par76

Transactions with Related Parties - Summary of Expenses (Detail) - PNMAC Capital Management LLC [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Related Party Transaction [Line Items]
Common overhead incurred by PCM and its affiliates	$ 1,121	$ 1,434
Expenses incurred on the Company’s behalf, net	573	255
Total expenses incurred in transaction with affiliates	1,694	1,689
Payments and settlements during the quarter	$ 7,658	$ 24,393

Transactions with Related Par77

Transactions with Related Parties - Note Payable to PLS - Additional Information (Detail) - USD ($)	Dec. 19, 2016	Aug. 04, 2009	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Related Party Transaction [Line Items]
Recapture percentage loan fee rate and unpaid principal balance refinance mortgage loans	90.00%
Recapture percentage loan fee rate and unpaid principal balance modified mortgage 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
Payment of contingent underwriting fees			$ 0	$ 0
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
Payment of contingent underwriting fees		$ 5,900,000

Transactions with Related Par78

Transactions with Related Parties - Summary of Investing Activity (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
ESS:
Interest income	$ 40,980	$ 48,100
Net gain (loss) included in Net gain (loss) on investments:
Net (loss) gain on investments	18	16,721
PennyMac Financial Services, Inc. [Member]
ESS:
Received pursuant to a recapture agreement	904	1,573
Repayments and sales	12,291	14,632
Interest income	3,934	4,647
Net gain (loss) included in Net gain (loss) on investments:
Valuation changes	6,921	(2,773)
Recapture income	830	1,403
Net (loss) gain on investments	$ 7,751	$ (1,370)

Transactions with Related Par79

Transactions with Related Parties - Summary of Financing Activities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Related Party Transaction [Line Items]
Interest expense	$ 34,816	$ 37,179
PennyMac Financial Services, Inc. [Member]
Related Party Transaction [Line Items]
Interest expense	1,976	$ 1,805
Assets sold to PFSI under agreement to repurchase	142,938		$ 144,128
Conditional Reimbursement payable to PFSI included in Accounts payable and accrued liabilities	870		870
PennyMac Financial Services, Inc. [Member] | Accounts Payable and Accrued Liabilities [Member]
Related Party Transaction [Line Items]
Conditional Reimbursement payable to PFSI included in Accounts payable and accrued liabilities	$ 870		$ 870

Transactions with Related Par80

Transactions with Related Parties - Summary of Amounts Receivable From and Payable to PFSI (Detail) - PennyMac Financial Services, Inc. [Member] - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Due from PFSI:
MSR recapture receivable	$ 207	$ 282
Other	106	3,872
Due from Affiliates	313	4,154
Due to PFSI:
Allocated expenses and expenses paid by PFSI on PMT’s behalf	8,806	11,542
Management fees	5,696	5,901
Mortgage loan servicing fees	5,562	6,583
Fulfillment fees	4,471	346
Correspondent production fees	1,825	1,735
Conditional Reimbursement	870	870
Interest on Assets sold to PFSI under agreement to repurchase	126	142
Total expense due to affiliate	$ 27,356	$ 27,119

Loan Sales and Variable Inter81

Loan Sales and Variable Interest Entities - Summary of Cash Flows between Company and Transferees in Transfers Accounted for Sales (Detail) - Variable Interest Entity, Not Primary Beneficiary, Aggregated Disclosure [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows:
Proceeds from sales	$ 5,200,584	$ 4,858,845
Mortgage loan servicing fees received	$ 48,732	$ 37,281

Loan Sales and Variable Inter82

Loan Sales and Variable Interest Entities - Summary of Unpaid Balance Information for Mortgage Loans Accounted for Sales (Detail) - Variable Interest Entity, Not Primary Beneficiary, Aggregated Disclosure [Member] - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Mortgage Loans On Real Estate [Line Items]
UPB of mortgage loans outstanding	$ 74,783,511	$ 71,639,351
Delinquent mortgage loans:
30-89 days delinquent	360,518	532,673
90 or more days delinquent:
Not in foreclosure	288,653	280,786
In foreclosure	31,989	25,258
Bankruptcy	56,032	52,202
Custodial funds managed by the Company	$ 1,005,744	$ 879,321

Loan Sales and Variable Inter83

Loan Sales and Variable Interest Entities - Summary of Credit Risk Transfer Agreements (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Transfer Of Financial Assets Accounted For As Sales [Line Items]
Deposits securing CRT Agreements	$ 41,789	$ 15,793
Carrying value of CRT Agreements:
Deposits securing CRT agreements	622,330		$ 588,867
Interest-only security payable at fair value	7,796		7,070
CRT Agreement assets pledged to secure assets sold under agreements to repurchase:
Deposits securing CRT Agreements	392,453		400,778
Derivative assets	24,423		26,058
Commitments to fund Deposits securing credit risk transfer agreements	552,957
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 mortgage loans sold under CRT Agreements	3,210,478	1,834,295
Deposits securing CRT Agreements	41,789	15,793
Increase in commitments to fund Deposits securing CRT Agreements resulting from sale of mortgage loans under CRT Agreements	70,486	48,150
Interest earned on Deposits securing CRT Agreements	2,031	408
Gains recognized on CRT Agreements included in Net gain (loss) on investments
Realized	19,329	10,288
Resulting from valuation changes	5,355	10,019
Gains (losses) recognized on gross derivative related to credit risk transactions	24,684	20,307
Change in fair value of interest-only security payable at fair value	(2,133)	(1,720)
Gains (losses) recognized on net derivative related to credit risk transactions	22,551	18,587
Payments made to settle losses	828	$ 149
UPB of mortgage loans subject to credit guarantee obligations	29,726,369		26,845,392
Delinquency status (in UPB):
Current	29,456,524		26,540,953
30—89 days delinquent	130,583		179,144
90—180 days delinquent	90,418		101,114
180 or more days delinquent	26,343		5,146
Foreclosure	8,335		5,463
Bankruptcy	14,166		13,572
Carrying value of CRT Agreements:
Deposits securing CRT agreements	622,330		588,867
Interest-only security payable at fair value	7,796		7,070
CRT Agreement assets pledged to secure assets sold under agreements to repurchase:
Deposits securing CRT Agreements	392,453		400,778
Commitments to fund Deposits securing credit risk transfer agreements	552,957		482,471
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] | Credit Risk Transfer Agreements [Member] | Derivative Assets [Member]
Carrying value of CRT Agreements:
Derivative assets	103,995		98,640
CRT Agreement assets pledged to secure assets sold under agreements to repurchase:
Derivative assets	$ 24,423		$ 26,058

Loan Sales and Variable Inter84

Loan Sales and Variable Interest Entities - Additional Information (Detail) - Jumbo Mortgage Loan Financing [Member] - Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] - USD ($) $ in Millions	Sep. 30, 2013	Mar. 31, 2018
Mortgage Loans on Real Estate [Line Items]
Certificates issued	$ 537
Weighted yield	3.90%
Fair value of certificates retained		$ 14.1

Fair Value - Additional Informa

Fair Value - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Mortgage Servicing Rights [Line Items]
Mortgage loans description	Note interest rate pools of 50 basis points
Basis point for mortgage loan	0.50%
Fair value of exchangeable senior notes	$ 249.5	$ 244.9
Repurchase Agreement Derivatives [Member] | Level 3 [Member]
Mortgage Servicing Rights [Line Items]
Ratio included in estimated fair value	97.00%	97.00%
Maximum [Member]
Mortgage Servicing Rights [Line Items]
Fixed-rate mortgage loans	4.50%
Minimum [Member]
Mortgage Servicing Rights [Line Items]
Fixed-rate mortgage loans	3.00%
MSRs Backed by Mortgage Loans [Member]
Mortgage Servicing Rights [Line Items]
Initial interest rates	less than or equal to 4.5%
MSRs Backed by Mortgage Loans [Member] | Maximum [Member]
Mortgage Servicing Rights [Line Items]
Interest rate	4.50%

Fair Value - Summary of Financi

Fair Value - Summary of Financial Statement Items Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Assets:
Short-term investments	$ 71,044	$ 18,398
Mortgage-backed securities at fair value	1,436,456	989,461
Mortgage loans acquired for sale at fair value	1,115,534	1,269,515
Excess servicing spread purchased from PFSI	236,002	236,534
Derivative assets:
Derivative assets	129,458	115,803
Derivative assets, Netting	(6,940)	(1,922)
Total derivative assets after netting	122,518	113,881
Mortgage servicing rights at fair value	957,013	91,459	$ 69,683	$ 64,136
Liabilities:
Asset-backed financing of a VIE at fair value	296,982	307,419
Interest-only security payable at fair value	7,796	7,070
Derivative liabilities:
Derivative liabilities	8,857	3,305
Derivative liabilities, Netting	(5,221)	(1,999)
Total derivative liabilities after netting	3,636	1,306
CRT Agreements [Member]
Derivative assets:
Derivative assets	103,995	98,640
Derivative assets, Netting	0	0
Total derivative assets after netting	103,995	98,640
Derivative liabilities:
Derivative liabilities	0	0
Interest Rate Lock Commitments [Member]
Derivative assets:
Derivative assets	3,220	4,859
Total derivative assets after netting	3,220	4,859
Derivative liabilities:
Derivative liabilities	511	227
Forward Purchase Contracts [Member]
Derivative assets:
Derivative assets	11,400	4,343
Derivative assets, Netting	0	0
Total derivative assets after netting	11,400	4,343
Derivative liabilities:
Derivative liabilities	1	248
Forward Sales Contracts [Member]
Derivative assets:
Derivative assets	6	387
Derivative assets, Netting	0	0
Total derivative assets after netting	6	387
Derivative liabilities:
Derivative liabilities	8,345	2,830
MBS Put Options [Member]
Derivative assets:
Derivative assets	4,086	3,170
Derivative assets, Netting	0	0
Total derivative assets after netting	4,086	3,170
Derivative liabilities:
Derivative liabilities	0	0
Call Options on Interest Rate Futures [Member]
Derivative assets:
Derivative assets	492	0
Derivative assets, Netting	0	0
Total derivative assets after netting	492	0
Derivative liabilities:
Derivative liabilities	0	0
Put Options on Interest Rate Futures [Member]
Derivative assets:
Derivative assets	367	656
Derivative assets, Netting	0	0
Total derivative assets after netting	367	656
Derivative liabilities:
Derivative liabilities	0	0
Repurchase Agreement Derivatives [Member]
Derivative assets:
Derivative assets	5,892	3,748
Derivative assets, Netting	0	0
Total derivative assets after netting	5,892	3,748
Derivative liabilities:
Derivative liabilities	0	0
Recurring [Member]
Assets:
Short-term investments	71,044	18,398
Mortgage-backed securities at fair value	1,436,456	989,461
Mortgage loans acquired for sale at fair value	1,115,534	1,269,515
Mortgage loans at fair value	779,489	1,089,473
Excess servicing spread purchased from PFSI	236,002	236,534
Derivative assets:
Derivative assets	129,458	115,803
Derivative assets, Netting	(6,940)	(1,922)
Total derivative assets after netting	122,518	113,881
Mortgage servicing rights at fair value	957,013	91,459
Total Assets	4,718,056	3,808,721
Liabilities:
Asset-backed financing of a VIE at fair value	296,982	307,419
Interest-only security payable at fair value	7,796	7,070
Derivative liabilities:
Derivative liabilities	8,857	3,305
Derivative liabilities, Netting	(5,221)	(1,999)
Total derivative liabilities after netting	3,636	1,306
Total liabilities	308,414	315,795
Recurring [Member] | CRT Agreements [Member]
Derivative assets:
Derivative assets	103,995	98,640
Recurring [Member] | Interest Rate Lock Commitments [Member]
Derivative assets:
Derivative assets	3,220	4,859
Derivative liabilities:
Derivative liabilities	511	227
Recurring [Member] | Forward Purchase Contracts [Member]
Derivative assets:
Derivative assets	11,400	4,343
Derivative liabilities:
Derivative liabilities	1	248
Recurring [Member] | Forward Sales Contracts [Member]
Derivative assets:
Derivative assets	6	387
Derivative liabilities:
Derivative liabilities	8,345	2,830
Recurring [Member] | Level 1 [Member]
Assets:
Short-term investments	71,044	18,398
Mortgage-backed securities at fair value	0	0
Mortgage loans acquired for sale at fair value	0	0
Mortgage loans at fair value	0	0
Excess servicing spread purchased from PFSI	0	0
Derivative assets:
Derivative assets	859	656
Derivative assets, Netting	0	0
Total derivative assets after netting	859	656
Mortgage servicing rights at fair value	0	0
Total Assets	71,903	19,054
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] | CRT Agreements [Member]
Derivative assets:
Derivative assets	0	0
Recurring [Member] | Level 1 [Member] | Interest Rate Lock Commitments [Member]
Derivative assets:
Derivative assets	0	0
Derivative liabilities:
Derivative liabilities	0	0
Recurring [Member] | Level 1 [Member] | Forward Purchase Contracts [Member]
Derivative assets:
Derivative assets	0	0
Derivative liabilities:
Derivative liabilities	0	0
Recurring [Member] | Level 1 [Member] | Forward Sales Contracts [Member]
Derivative assets:
Derivative assets	0	0
Derivative liabilities:
Derivative liabilities	0	0
Recurring [Member] | Level 2 [Member]
Assets:
Short-term investments	0	0
Mortgage-backed securities at fair value	1,436,456	989,461
Mortgage loans acquired for sale at fair value	1,107,844	1,261,380
Mortgage loans at fair value	311,102	321,040
Excess servicing spread purchased from PFSI	0	0
Derivative assets:
Derivative assets	15,492	7,900
Derivative assets, Netting	0	0
Total derivative assets after netting	15,492	7,900
Mortgage servicing rights at fair value	0	0
Total Assets	2,870,894	2,579,781
Liabilities:
Asset-backed financing of a VIE at fair value	296,982	307,419
Interest-only security payable at fair value	0	0
Derivative liabilities:
Derivative liabilities	8,346	3,078
Derivative liabilities, Netting	0	0
Total derivative liabilities after netting	8,346	3,078
Total liabilities	305,328	310,497
Recurring [Member] | Level 2 [Member] | CRT Agreements [Member]
Derivative assets:
Derivative assets	0	0
Recurring [Member] | Level 2 [Member] | Interest Rate Lock Commitments [Member]
Derivative assets:
Derivative assets	0	0
Derivative liabilities:
Derivative liabilities	0	0
Recurring [Member] | Level 2 [Member] | Forward Purchase Contracts [Member]
Derivative assets:
Derivative assets	11,400	4,343
Derivative liabilities:
Derivative liabilities	1	248
Recurring [Member] | Level 2 [Member] | Forward Sales Contracts [Member]
Derivative assets:
Derivative assets	6	387
Derivative liabilities:
Derivative liabilities	8,345	2,830
Recurring [Member] | Level 3 [Member]
Assets:
Short-term investments	0	0
Mortgage-backed securities at fair value	0	0
Mortgage loans acquired for sale at fair value	7,690	8,135
Mortgage loans at fair value	468,387	768,433
Excess servicing spread purchased from PFSI	236,002	236,534
Derivative assets:
Derivative assets	113,107	107,247
Derivative assets, Netting	0	0
Total derivative assets after netting	113,107	107,247
Mortgage servicing rights at fair value	957,013	91,459
Total Assets	1,782,199	1,211,808
Liabilities:
Asset-backed financing of a VIE at fair value	0	0
Interest-only security payable at fair value	7,796	7,070
Derivative liabilities:
Derivative liabilities	511	227
Derivative liabilities, Netting	0	0
Total derivative liabilities after netting	511	227
Total liabilities	8,307	7,297
Recurring [Member] | Level 3 [Member] | CRT Agreements [Member]
Derivative assets:
Derivative assets	103,995	98,640
Recurring [Member] | Level 3 [Member] | Interest Rate Lock Commitments [Member]
Derivative assets:
Derivative assets	3,220	4,859
Derivative liabilities:
Derivative liabilities	511	227
Recurring [Member] | Level 3 [Member] | Forward Purchase Contracts [Member]
Derivative assets:
Derivative assets	0	0
Derivative liabilities:
Derivative liabilities	0	0
Recurring [Member] | Level 3 [Member] | Forward Sales Contracts [Member]
Derivative assets:
Derivative assets	0	0
Derivative liabilities:
Derivative liabilities	0	0
Recurring [Member] | MBS Put Options [Member]
Derivative assets:
Derivative assets	4,086	3,170
Recurring [Member] | MBS Put Options [Member] | Level 1 [Member]
Derivative assets:
Derivative assets	0	0
Recurring [Member] | MBS Put Options [Member] | Level 2 [Member]
Derivative assets:
Derivative assets	4,086	3,170
Recurring [Member] | MBS Put Options [Member] | Level 3 [Member]
Derivative assets:
Derivative assets	0	0
Recurring [Member] | Call Options on Interest Rate Futures [Member]
Derivative assets:
Derivative assets	492
Recurring [Member] | Call Options on Interest Rate Futures [Member] | Level 1 [Member]
Derivative assets:
Derivative assets	492
Recurring [Member] | Call Options on Interest Rate Futures [Member] | Level 2 [Member]
Derivative assets:
Derivative assets	0
Recurring [Member] | Call Options on Interest Rate Futures [Member] | Level 3 [Member]
Derivative assets:
Derivative assets	0
Recurring [Member] | Put Options on Interest Rate Futures [Member]
Derivative assets:
Derivative assets	367	656
Recurring [Member] | Put Options on Interest Rate Futures [Member] | Level 1 [Member]
Derivative assets:
Derivative assets	367	656
Recurring [Member] | Put Options on Interest Rate Futures [Member] | Level 2 [Member]
Derivative assets:
Derivative assets	0	0
Recurring [Member] | Put Options on Interest Rate Futures [Member] | Level 3 [Member]
Derivative assets:
Derivative assets	0	0
Recurring [Member] | Repurchase Agreement Derivatives [Member]
Derivative assets:
Derivative assets	5,892	3,748
Recurring [Member] | Repurchase Agreement Derivatives [Member] | Level 1 [Member]
Derivative assets:
Derivative assets	0	0
Recurring [Member] | Repurchase Agreement Derivatives [Member] | Level 2 [Member]
Derivative assets:
Derivative assets	0	0
Recurring [Member] | Repurchase Agreement Derivatives [Member] | Level 3 [Member]
Derivative assets:
Derivative assets	$ 5,892	$ 3,748

Fair Value - Summary of Changes

Fair Value - Summary of Changes in Items Measured Using Level 3 Inputs on Recurring Basis (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Assets:
Servicing received as proceeds from sales of mortgage loans	$ 66,546	$ 7,478
Recurring [Member]
Assets:
Beginning balance	1,984,616	1,726,764
Purchases and issuances	9,604	17,824
Repayments and sales	(307,680)	(138,496)
Capitalization of interest	6,114	14,550
Capitalization of advances	1,677	6,349
ESS received pursuant to a recapture agreement with PFSI	904	1,573
Servicing received as proceeds from sales of mortgage loans	66,546	7,478
Changes in fair value included in income arising from:
Changes in instrument-specific credit risk	2,681	4,970
Other factors	25,570	24,958
Total	28,251	29,928
Transfers of mortgage loans to REO and real estate held for investment	(21,439)	(30,911)
Transfers of mortgage loans acquired for sale at fair value from "Level 2" to "Level 3" (2)	160
Transfers of interest rate lock commitments to mortgage loans acquired for sale	12,935	(23,989)
Ending balance	1,781,688	1,611,070
Changes in fair value recognized during the quarter relating to assets	31,981	14,459
Recurring [Member] | Accounting Standards Update 2014-11 Transfers and Servicing [Member]
Assets:
Beginning balance	773,035
Recurring [Member] | Previously Reported [Member]
Assets:
Beginning balance	1,211,581
Recurring [Member] | CRT Agreements [Member]
Assets:
Beginning balance	98,640	15,610
Purchases and issuances	0	0
Repayments and sales	(19,329)	(10,288)
Capitalization of interest	0	0
Capitalization of advances	0	0
ESS received pursuant to a recapture agreement with PFSI	0	0
Servicing received as proceeds from sales of mortgage loans	0	0
Changes in fair value included in income arising from:
Changes in instrument-specific credit risk	0	0
Other factors	24,684	20,307
Total	24,684	20,307
Transfers of mortgage loans to REO and real estate held for investment	0	0
Transfers of mortgage loans acquired for sale at fair value from "Level 2" to "Level 3" (2)	0
Transfers of interest rate lock commitments to mortgage loans acquired for sale	0	0
Ending balance	103,995	25,629
Changes in fair value recognized during the quarter relating to assets	5,355	10,019
Recurring [Member] | Mortgage loans acquired for sale at fair value [Member]
Assets:
Beginning balance	8,135
Purchases and issuances	2,831
Repayments and sales	(3,539)
Capitalization of interest	0
Capitalization of advances	0
ESS received pursuant to a recapture agreement with PFSI	0
Servicing received as proceeds from sales of mortgage loans	0
Changes in fair value included in income arising from:
Changes in instrument-specific credit risk	0
Other factors	103
Total	103
Transfers of mortgage loans to REO and real estate held for investment	0
Transfers of mortgage loans acquired for sale at fair value from "Level 2" to "Level 3" (2)	160
Transfers of interest rate lock commitments to mortgage loans acquired for sale	0
Ending balance	7,690
Changes in fair value recognized during the quarter relating to assets	(14)
Recurring [Member] | Interest Rate Lock Commitments [Member]
Assets:
Beginning balance	4,632	3,777
Purchases and issuances	4,609	17,762
Repayments and sales	0	0
Capitalization of interest	0	0
Capitalization of advances	0	0
ESS received pursuant to a recapture agreement with PFSI	0	0
Servicing received as proceeds from sales of mortgage loans	0	0
Changes in fair value included in income arising from:
Changes in instrument-specific credit risk	0	0
Other factors	(19,467)	11,171
Total	(19,467)	11,171
Transfers of mortgage loans to REO and real estate held for investment	0	0
Transfers of mortgage loans acquired for sale at fair value from "Level 2" to "Level 3" (2)	0
Transfers of interest rate lock commitments to mortgage loans acquired for sale	12,935	(23,989)
Ending balance	2,709	8,721
Changes in fair value recognized during the quarter relating to assets	2,709	8,721
Recurring [Member] | Interest-only security payable [Member]
Liabilities:
Beginning balance	7,070	4,114
Changes in fair value included in income arising from:
Changes in instrument-specific credit risk	0	0
Other factors	726	487
Total	726	487
Ending balance	7,796	4,601
Changes in fair value recognized during the quarter relating to liability	726	487
Recurring [Member] | Mortgage loans at fair value [Member]
Assets:
Beginning balance	768,433	1,354,572
Purchases and issuances	0	0
Repayments and sales	(272,513)	(113,576)
Capitalization of interest	2,180	9,903
Capitalization of advances	1,677	6,349
ESS received pursuant to a recapture agreement with PFSI	0	0
Servicing received as proceeds from sales of mortgage loans	0	0
Changes in fair value included in income arising from:
Changes in instrument-specific credit risk	2,681	4,970
Other factors	(12,632)	(1,754)
Total	(9,951)	3,216
Transfers of mortgage loans to REO and real estate held for investment	(21,439)	(30,911)
Transfers of mortgage loans acquired for sale at fair value from "Level 2" to "Level 3" (2)	0
Transfers of interest rate lock commitments to mortgage loans acquired for sale	0	0
Ending balance	468,387	1,229,553
Changes in fair value recognized during the quarter relating to assets	(9,040)	485
Recurring [Member] | Excess servicing spread [Member]
Assets:
Beginning balance	236,534	288,669
Purchases and issuances	0	0
Repayments and sales	(12,291)	(14,632)
Capitalization of interest	3,934	4,647
Capitalization of advances	0	0
ESS received pursuant to a recapture agreement with PFSI	904	1,573
Servicing received as proceeds from sales of mortgage loans	0	0
Changes in fair value included in income arising from:
Changes in instrument-specific credit risk	0	0
Other factors	6,921	(2,773)
Total	6,921	(2,773)
Transfers of mortgage loans to REO and real estate held for investment	0	0
Transfers of mortgage loans acquired for sale at fair value from "Level 2" to "Level 3" (2)	0
Transfers of interest rate lock commitments to mortgage loans acquired for sale	0	0
Ending balance	236,002	277,484
Changes in fair value recognized during the quarter relating to assets	6,921	(2,773)
Recurring [Member] | Mortgage servicing rights [Member]
Assets:
Beginning balance	864,494	64,136
Purchases and issuances	0	62
Repayments and sales	0	0
Capitalization of interest	0	0
Capitalization of advances	0	0
ESS received pursuant to a recapture agreement with PFSI	0	0
Servicing received as proceeds from sales of mortgage loans	66,546	7,478
Changes in fair value included in income arising from:
Changes in instrument-specific credit risk	0	0
Other factors	25,973	(1,993)
Total	25,973	(1,993)
Transfers of mortgage loans to REO and real estate held for investment	0	0
Transfers of mortgage loans acquired for sale at fair value from "Level 2" to "Level 3" (2)	0
Transfers of interest rate lock commitments to mortgage loans acquired for sale	0	0
Ending balance	957,013	69,683
Changes in fair value recognized during the quarter relating to assets	25,973	$ (1,993)
Recurring [Member] | Mortgage servicing rights [Member] | Accounting Standards Update 2014-11 Transfers and Servicing [Member]
Assets:
Beginning balance	773,035
Recurring [Member] | Mortgage servicing rights [Member] | Previously Reported [Member]
Assets:
Beginning balance	91,459
Recurring [Member] | Repurchase Agreement Derivatives [Member]
Assets:
Beginning balance	3,748
Purchases and issuances	2,164
Repayments and sales	(8)
Capitalization of interest	0
Capitalization of advances	0
ESS received pursuant to a recapture agreement with PFSI	0
Servicing received as proceeds from sales of mortgage loans	0
Changes in fair value included in income arising from:
Changes in instrument-specific credit risk	0
Other factors	(12)
Total	(12)
Transfers of mortgage loans to REO and real estate held for investment	0
Transfers of mortgage loans acquired for sale at fair value from "Level 2" to "Level 3" (2)	0
Transfers of interest rate lock commitments to mortgage loans acquired for sale	0
Ending balance	5,892
Changes in fair value recognized during the quarter relating to assets	$ 77

Fair Value - Fair Values and Re

Fair Value - Fair Values and Related Principal Amounts Due upon Maturity of Mortgage Loans Accounted for Under Fair Value Option (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value Option Loans Held As Assets [Abstract]
Fair value option loans held as assets, Total	$ 779,489	$ 1,089,473
Mortgage loans at fair value	779,489	1,089,473
Mortgage Loans On Real Estate Other Required Disclosures [Abstract]
Unpaid principal balance of loans outstanding at period-end	958,951	1,360,642
Unpaid principal balance	958,951	1,360,642
Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due, Aggregate Difference
Fair Value, Option, Loans Held as Assets, Aggregate Difference, Total	(179,462)	(271,169)
Mortgage loans acquired for sale at fair value [Member]
Fair Value Option Loans Held As Assets [Abstract]
Fair value option loans held as assets ninety days or less past due	1,114,282	1,268,121
Not in foreclosure	606	950
In foreclosure	646	444
Fair value option loans held as assets, Total	1,252	1,394
Mortgage loans at fair value	1,115,534	1,269,515
Mortgage Loans On Real Estate Other Required Disclosures [Abstract]
Mortgage loans on real estate principal amount of delinquent loans less than ninety days	1,084,121	1,221,125
Not in foreclosure	725	1,120
In foreclosure	683	496
Unpaid principal balance of loans outstanding at period-end	1,085,529	1,222,741
Fair value option loans held as assets ninety days or less past due aggregate difference	30,161	46,996
Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due, Aggregate Difference
Not in foreclosure	(119)	(170)
In foreclosure	(37)	(52)
Fair Value, Option, Loans Held as Assets, Aggregate Difference, Total	30,005	46,774
Mortgage loans acquired for sale at fair value [Member] | Nonperforming mortgage loans [Member]
Mortgage Loans On Real Estate Other Required Disclosures [Abstract]
Unpaid principal balance of loans outstanding at period-end	1,408	1,616
Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due, Aggregate Difference
Fair Value, Option, Loans Held as Assets, Aggregate Difference, Total	(156)	(222)
Mortgage Loans at Fair Value Held in Consolidated VIE [Member]
Fair Value Option Loans Held As Assets [Abstract]
Fair value option loans held as assets ninety days or less past due	311,102	321,040
Not in foreclosure	0	0
In foreclosure	0	0
Mortgage loans at fair value	311,102	321,040
Mortgage Loans On Real Estate Other Required Disclosures [Abstract]
Mortgage loans on real estate principal amount of delinquent loans less than ninety days	312,730	316,684
Not in foreclosure	0	0
In foreclosure	0	0
Unpaid principal balance	312,730	316,684
Fair value option loans held as assets ninety days or less past due aggregate difference	(1,628)	4,356
Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due, Aggregate Difference
Not in foreclosure	0	0
In foreclosure	0	0
Fair Value, Option, Loans Held as Assets, Aggregate Difference, Total	(1,628)	4,356
Mortgage Loans at Fair Value Held in Consolidated VIE [Member] | Nonperforming mortgage loans [Member]
Fair Value Option Loans Held As Assets [Abstract]
Mortgage loans at fair value	0	0
Mortgage Loans On Real Estate Other Required Disclosures [Abstract]
Unpaid principal balance	0	0
Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due, Aggregate Difference
Fair Value, Option, Loans Held as Assets, Aggregate Difference, Total	0	0
Mortgage Loans and Mortgage Loans under Forward Purchase Agreements at Fair Value [Member]
Fair Value Option Loans Held As Assets [Abstract]
Fair value option loans held as assets ninety days or less past due	263,263	414,785
Not in foreclosure	97,971	166,749
In foreclosure	107,153	186,899
Mortgage loans at fair value	468,387	768,433
Mortgage Loans On Real Estate Other Required Disclosures [Abstract]
Mortgage loans on real estate principal amount of delinquent loans less than ninety days	334,185	519,009
Not in foreclosure	155,224	257,038
In foreclosure	156,812	267,911
Unpaid principal balance	646,221	1,043,958
Fair value option loans held as assets ninety days or less past due aggregate difference	(70,922)	(104,224)
Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due, Aggregate Difference
Not in foreclosure	(57,253)	(90,289)
In foreclosure	(49,659)	(81,012)
Fair Value, Option, Loans Held as Assets, Aggregate Difference, Total	(177,834)	(275,525)
Mortgage Loans and Mortgage Loans under Forward Purchase Agreements at Fair Value [Member] | Nonperforming mortgage loans [Member]
Fair Value Option Loans Held As Assets [Abstract]
Mortgage loans at fair value	205,124	353,648
Mortgage Loans On Real Estate Other Required Disclosures [Abstract]
Unpaid principal balance	312,036	524,949
Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due, Aggregate Difference
Fair Value, Option, Loans Held as Assets, Aggregate Difference, Total	$ (106,912)	$ (171,301)

Fair Value - Summary of Chang89

Fair Value - Summary of Changes in Fair Value Included in Current Period Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Fair Value, Option, Quantitative Disclosures [Line Items]
Net gain on mortgage loans acquired for sale	$ 7,627	$ 19,025
Net gain (loss) on investments	18	16,721
Interest-only security payable [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Net gain on mortgage loans acquired for sale	0	0
Net gain (loss) on investments	726	(487)
Net mortgage loan servicing fees	0	0
Net interest income	0	0
Total	726	(487)
Asset-Backed Financing of the VIE at Fair Value [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Net gain on mortgage loans acquired for sale	0	0
Net gain (loss) on investments	6,183	(24)
Net mortgage loan servicing fees	0	0
Net interest income	339	(387)
Total	6,522	(411)
Liabilities, Total [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Net gain on mortgage loans acquired for sale	0	0
Net gain (loss) on investments	6,909	(511)
Net mortgage loan servicing fees	0	0
Net interest income	339	(387)
Total	7,248	(898)
Short-term Investments [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Net gain on mortgage loans acquired for sale	0	0
Net gain (loss) on investments	0	0
Net mortgage loan servicing fees	0	0
Net interest income	0	0
Total	0	0
Mortgage-backed securities at fair value [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Net gain on mortgage loans acquired for sale	0	0
Net gain (loss) on investments	(22,397)	140
Net mortgage loan servicing fees	0	0
Net interest income	440	(1,318)
Total	(21,957)	(1,178)
Mortgage loans acquired for sale at fair value [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Net gain on mortgage loans acquired for sale	(23,678)	14,158
Net gain (loss) on investments	0	0
Net mortgage loan servicing fees	0	0
Net interest income	0	0
Total	(23,678)	14,158
Mortgage loans at fair value [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Net gain on mortgage loans acquired for sale	0	0
Net gain (loss) on investments	(15,530)	3,532
Net mortgage loan servicing fees	0	0
Net interest income	1,774	10,201
Total	(13,756)	13,733
Excess servicing spread [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Net gain on mortgage loans acquired for sale	0	0
Net gain (loss) on investments	6,921	(2,773)
Net mortgage loan servicing fees	0	0
Net interest income	3,934	4,647
Total	10,855	1,874
MSRs at fair value [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Net gain on mortgage loans acquired for sale	0	0
Net gain (loss) on investments	0	0
Net mortgage loan servicing fees	25,973	(1,993)
Net interest income	0	0
Total	25,973	(1,993)
Assets, Total [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Net gain on mortgage loans acquired for sale	(23,678)	14,158
Net gain (loss) on investments	(31,006)	899
Net mortgage loan servicing fees	25,973	(1,993)
Net interest income	6,148	13,530
Total	$ (22,563)	$ 26,594

Fair Value - Summary of Finan90

Fair Value - Summary of Financial Statement Items Re-measured at Fair Value on Nonrecurring Basis (Detail) - Nonrecurring [Member] - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate acquired in settlement of loans	$ 57,675	$ 71,380
Total Assets	57,675	384,375
MSRs at lower of amortized cost or fair value		312,995
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
Total Assets	0	0
MSRs at lower of amortized cost or fair value		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
Total Assets	0	0
MSRs at lower of amortized cost or fair value		0
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate acquired in settlement of loans	57,675	71,380
Total Assets	$ 57,675	384,375
MSRs at lower of amortized cost or fair value		$ 312,995

Fair Value - Summary of Chang91

Fair Value - Summary of Changes in Fair Value Recognized in Assets that Measured at Fair Value on a Nonrecurring Basis (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 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	$ (1,504)
Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate asset acquired in settlement of loans	(4,769)	(7,060)
MSRs at lower of amortized cost or fair value	0	1,504
Total assets, gains (losses) recognized	$ (4,769)	$ (5,556)

Fair Value - Quantitative Summa

Fair Value - Quantitative Summary of Key Inputs Used in Valuation of Mortgage Loans at Fair Value (Detail) - Mortgage loans at fair value [Member]	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	3.20%	2.90%
Twelve-month projected housing price index change	2.20%	3.60%
Prepayment speed	3.10%	3.20%
Total prepayment speed	10.60%	10.80%
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	15.00%	15.00%
Twelve-month projected housing price index change	3.30%	4.60%
Prepayment speed	6.60%	11.00%
Total prepayment speed	22.80%	23.80%
Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	6.70%	6.90%
Twelve-month projected housing price index change	3.10%	4.40%
Prepayment speed	4.20%	4.20%
Total prepayment speed	16.20%	16.50%

Fair Value - Summary of Key Inp

Fair Value - Summary of Key Inputs Used in Determining Fair Value of ESS (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
UPB of underlying mortgage loans (in thousands)	$ 5,114,741	$ 660,586
Average servicing fee rate (in basis points)	0.26%	0.25%
Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Pricing spread	7.50%	7.60%
Annual total prepayment speed	8.00%		11.10%
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Pricing spread	7.40%	7.60%
Annual total prepayment speed	6.50%		7.30%
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Pricing spread	12.60%	7.60%
Annual total prepayment speed	27.20%		20.90%
Excess servicing spread [Member] | Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
UPB of underlying mortgage loans (in thousands)	$ 26,236,839		$ 27,217,199
Average servicing fee rate (in basis points)	0.34%		0.34%
Average ESS rate (in basis points)	0.19%		0.19%
Pricing spread	3.90%		4.10%
Annual total prepayment speed	9.90%		10.80%
Life (in years)	6 years 9 months 18 days		6 years 6 months
Excess servicing spread [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Pricing spread	3.60%		3.80%
Annual total prepayment speed	8.00%		8.40%
Life (in years)	1 year 1 month 6 days		1 year 4 months 24 days
Excess servicing spread [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Pricing spread	4.10%		4.30%
Annual total prepayment speed	52.40%		41.40%
Life (in years)	7 years 9 months 18 days		7 years 8 months 12 days

Fair Value - Quantitative Sum94

Fair Value - Quantitative Summary of Key Unobservable Inputs Used in Valuation of Interest Rate Lock Commitments (Detail)	Mar. 31, 2018	Dec. 31, 2017
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Pull-through rate	57.50%	58.00%
Servicing fee multiple	2.60%	2.10%
Percentage of UPB	0.00%	0.00%
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Pull-through rate	100.00%	100.00%
Servicing fee multiple	5.90%	5.80%
Percentage of UPB	2.60%	2.40%
Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Pull-through rate	88.00%	90.30%
Servicing fee multiple	4.70%	4.90%
Percentage of UPB	1.20%	1.30%

Fair Value - Quantitative Sum95

Fair Value - Quantitative Summary of Key Unobservable Inputs Used in Valuation of CRT Agreements (Detail) - CRT Agreements [Member]	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	5.60%	5.10%
Voluntary prepayment speed	8.60%	12.10%
Involuntary prepayment speed	0.30%	0.30%
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	6.60%	6.20%
Voluntary prepayment speed	10.40%	15.00%
Involuntary prepayment speed	0.30%	0.30%
Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	6.10%	5.60%
Voluntary prepayment speed	9.10%	13.00%
Involuntary prepayment speed	0.30%	0.30%

Fair Value - Key Assumptions Us

Fair Value - Key Assumptions Used in Determining Fair Value of MSRs at Time of Initial Recognition (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, MSR recognized	$ 66,546,000	$ 7,478,000
Fair value, UPB of underlying mortgage loans	$ 5,114,741,000	$ 660,586,000
Fair value, Weighted-average annual servicing fee rate (in basis points)	0.26%	0.25%
Amortized cost, MSR recognized	$ 0	$ 51,210,000
Amortized cost, UPB of underlying mortgage loans		$ 4,092,267,000
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	7.40%	7.60%
Fair value inputs, Annual prepayment speed during period	3.20%	7.90%
Fair value inputs, Weighted average life during period	3 years 6 months	4 years
Fair value inputs, Annual per loan cost of servicing during period	$ 79,000	$ 79,000
Amortized cost, Pricing spread during period		7.60%
Amortized cost, Annual prepayment speed during period		3.20%
Amortized cost, Life (in years)		2 years 8 months 12 days
Amortized cost, Annual per loan cost of servicing during period		$ 79,000
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value inputs, Pricing spread during period	12.60%	7.60%
Fair value inputs, Annual prepayment speed during period	22.80%	20.70%
Fair value inputs, Weighted average life during period	11 years 10 months 24 days	8 years 6 months
Fair value inputs, Annual per loan cost of servicing during period	$ 79,000	$ 79,000
Amortized cost, Pricing spread during period		12.60%
Amortized cost, Annual prepayment speed during period		28.70%
Amortized cost, Life (in years)		11 years 10 months 24 days
Amortized cost, Annual per loan cost of servicing during period		$ 79,000
Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value inputs, Pricing spread during period	7.50%	7.60%
Fair value inputs, Annual prepayment speed during period	8.10%	10.90%
Fair value inputs, Weighted average life during period	8 years 4 months 24 days	7 years 2 months 12 days
Fair value inputs, Annual per loan cost of servicing during period	$ 79,000	$ 79,000
Amortized cost, Pricing spread during period		7.60%
Amortized cost, Annual prepayment speed during period		7.50%
Amortized cost, Life (in years)		8 years 3 months 18 days
Amortized cost, Annual per loan cost of servicing during period		$ 79,000

Fair Value - Quantitative Sum97

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) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Balance at end of period	$ 957,013,000	$ 91,459,000	$ 69,683,000	$ 64,136,000
UPB of underlying mortgage loans, Fair Value	$ 75,261,574,000	$ 8,273,696,000
Weighted-average annual servicing fee rate (in basis points), Fair value input	0.25%	0.25%
Weighted-average note interest rate, Fair value	4.00%	4.70%
Carrying value, Amortized cost	$ 0	$ 753,322,000	$ 627,287,000
UPB of underlying mortgage loans, Amortized cost		$ 63,853,606,000
Weighted-average annual servicing fee rate (in basis points), Amortized cost		0.25%
Weighted-average note interest rate, Amortized cost		3.90%
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	(14,450,000)	$ (1,347,000)
Effect on value of percentage adverse change, Amortized cost		(11,848,000)
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	(28,487,000)	(2,655,000)
Effect on value of percentage adverse change, Amortized cost		(23,352,000)
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	(55,385,000)	(5,162,000)
Effect on value of percentage adverse change, Amortized cost		(45,379,000)
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	(13,939,000)	(1,954,000)
Effect on value of percentage adverse change, Amortized cost		(12,267,000)
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	(27,417,000)	(3,827,000)
Effect on value of percentage adverse change, Amortized cost		(24,120,000)
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	(53,083,000)	(7,352,000)
Effect on value of percentage adverse change, Amortized cost		(46,668,000)
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	(6,962,000)	(744,000)
Effect on value of percentage adverse change, Amortized cost		(5,721,000)
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	(13,925,000)	(1,488,000)
Effect on value of percentage adverse change, Amortized cost		(11,441,000)
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	$ (27,849,000)	(2,976,000)
Effect on value of percentage adverse change, Amortized cost		$ (22,883,000)
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value inputs, Pricing spread	7.40%	7.60%
Estimated fair value inputs, Prepayment speed	6.50%	7.30%
Estimated fair value inputs, Annual per-loan cost of servicing	$ 77,000	$ 77,000
Amortized cost, Pricing spread		7.60%
Amortized cost, Prepayment speed		7.10%
Amortized cost, Weighted average life (in years)		2 years 10 months 24 days
Amortized cost, Annual per-loan cost of servicing		$ 78,000
Minimum [Member] | Mortgage service rights [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value inputs, Weighted average life (in years)	2 years 10 months 24 days	3 years 1 month 6 days
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value inputs, Pricing spread	13.10%	12.60%
Estimated fair value inputs, Prepayment speed	27.20%	20.90%
Estimated fair value inputs, Annual per-loan cost of servicing	$ 79,000	$ 79,000
Amortized cost, Pricing spread		13.10%
Amortized cost, Prepayment speed		27.10%
Amortized cost, Weighted average life (in years)		8 years
Amortized cost, Annual per-loan cost of servicing		$ 79,000
Maximum [Member] | Mortgage service rights [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value inputs, Weighted average life (in years)	8 years 3 months 18 days	6 years 9 months 18 days
Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value inputs, Pricing spread	7.40%	7.60%
Estimated fair value inputs, Prepayment speed	8.00%	11.10%
Estimated fair value inputs, Annual per-loan cost of servicing	$ 79,000	$ 79,000
Amortized cost, Pricing spread		7.60%
Amortized cost, Prepayment speed		8.40%
Amortized cost, Weighted average life (in years)		7 years 7 months 6 days
Amortized cost, Annual per-loan cost of servicing		$ 79,000
Weighted Average [Member] | Mortgage service rights [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value inputs, Weighted average life (in years)	7 years 10 months 24 days	6 years 9 months 18 days

Mortgage Loans Acquired for S98

Mortgage Loans Acquired for Sale at Fair Value - Summary of Distribution of Company's Mortgage Loans Acquired for Sale at Fair Value (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans acquired for sale at fair value	$ 1,115,534	$ 1,269,515
Mortgage loans pledged to secure: Assets sold under agreements to repurchase	1,097,266	1,249,277
Mortgage loans pledged to secure total	1,097,266	1,249,277
Penny Mac Loan Services Llc
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans acquired for sale at fair value	259,673	279,571
Mortgage Loans Acquired for Sale [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans pledged to secure: Assets sold under agreements to repurchase	1,097,266	1,201,992
Mortgage loans pledged to secure mortgage loan participation purchase and sale agreements	0	47,285
Agency-Eligible [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans acquired for sale at fair value	837,994	971,910
Held for Sale to PLS - Government-Insured or Guaranteed [Member] | Penny Mac Loan Services Llc
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans acquired for sale at fair value	259,673	279,571
Commercial Real Estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans acquired for sale at fair value	10,177	9,898
Repurchased Pursuant to Representations and Warranties [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans acquired for sale at fair value	$ 7,690	$ 8,136

Mortgage Loans Acquired for S99

Mortgage Loans Acquired for Sale at Fair Value - Additional Information (Detail) - Penny Mac Loan Services Llc	3 Months Ended
	Mar. 31, 2018
Minimum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Sourcing fee on average number of calendar days mortgage 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 mortgage loans are held prior to purchase by PLS	0.035%

Mortgage Loans at Fair Value -

Mortgage Loans at Fair Value - Summary of Distribution of Company's Mortgage Loans at Fair Value (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Fair value	$ 779,489	$ 1,089,473
Unpaid principal balance	958,951	1,360,642
Asset-backed financing of a VIE at fair value	311,102	321,040
Mortgage loans at fair value pledged to secure	770,911	1,081,893
Mortgage loans acquired for sale at fair value [Member]
Financing Receivable, Recorded Investment [Line Items]
Fair value	1,115,534	1,269,515
Assets sold under agreements to repurchase	459,809	760,853
Fixed interest rate jumbo mortgage loans held in a VIE [Member]
Financing Receivable, Recorded Investment [Line Items]
Fair value	311,102	321,040
Unpaid principal balance	312,730	316,684
Distressed mortgage loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Fair value	468,387	768,433
Unpaid principal balance	646,221	1,043,958
Distressed mortgage loans [Member] | Nonperforming mortgage loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Fair value	205,124	353,648
Unpaid principal balance	312,036	524,949
Distressed mortgage loans [Member] | Performing mortgage loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Fair value	263,263	414,785
Unpaid principal balance	334,185	519,009
Distressed mortgage loans [Member] | Performing mortgage loans [Member] | Interest rate step-up [Member]
Financing Receivable, Recorded Investment [Line Items]
Fair value	137,451	189,724
Unpaid principal balance	181,412	242,335
Distressed mortgage loans [Member] | Performing mortgage loans [Member] | Fixed interest rate [Member]
Financing Receivable, Recorded Investment [Line Items]
Fair value	102,605	186,929
Unpaid principal balance	128,737	236,840
Distressed mortgage loans [Member] | Performing mortgage loans [Member] | Adjustable-rate/hybrid [Member]
Financing Receivable, Recorded Investment [Line Items]
Fair value	23,207	38,132
Unpaid principal balance	$ 24,036	$ 39,834

Mortgage Loans at Fair Value101

Mortgage Loans at Fair Value - Summary of Certain Concentrations of Credit Risk in Portfolio of Distressed Mortgage Loans at Fair Value (Detail)	Mar. 31, 2018	Dec. 31, 2017
Risks And Uncertainties [Abstract]
Portion of mortgage loans originated between 2005 and 2007	73.00%	73.00%
Mortgage loans with unpaid-principal balance-to-current -property-value in excess of 100%	38.00%	38.00%

Mortgage Loans at Fair Value102

Mortgage Loans at Fair Value - Summary of Certain Concentrations of Credit Risk in Portfolio of Distressed Mortgage Loans at Fair Value (Parenthetical) (Detail)	Mar. 31, 2018	Dec. 31, 2017
Risks And Uncertainties [Abstract]
Percentage of mortgage loans	100.00%	100.00%
Percentage of contribution by states in mortgage loans	5.00%	5.00%

Derivative Activities - Derivat

Derivative Activities - Derivative Assets and Liabilities Recorded within Derivative Assets and Derivative Liabilities and Related Margin Deposits Recorded in Other Assets (Detail) - USD ($)	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Derivatives Fair Value [Line Items]
Total derivative assets instruments before netting	$ 129,458,000	$ 115,803,000
Derivative assets, Netting	(6,940,000)	(1,922,000)
Total derivative assets after netting	122,518,000	113,881,000
Margin deposits (received from) placed with derivatives counterparties included in Other assets (Accounts payable and accrued liabilities)	(1,718,000)	76,000
Derivative assets pledged to secure assets sold under agreements to repurchase	24,423,000	26,058,000
Total derivative liabilities	8,857,000	3,305,000
Derivative liabilities, Netting	(5,221,000)	(1,999,000)
Total derivative liabilities after netting	3,636,000	1,306,000
Repurchase Agreement Derivatives [Member]
Derivatives Fair Value [Line Items]
Notional amount	0	0
Total derivative assets instruments before netting	5,892,000	3,748,000
Derivative assets, Netting	0	0
Total derivative assets after netting	5,892,000	3,748,000
Total derivative liabilities	0	0
CRT Agreements [Member]
Derivatives Fair Value [Line Items]
Notional amount	29,726,369,000	26,845,392,000
Total derivative assets instruments before netting	103,995,000	98,640,000
Derivative assets, Netting	0	0
Total derivative assets after netting	103,995,000	98,640,000
Total derivative liabilities	0	0
Interest Rate Lock Commitments [Member]
Derivatives Fair Value [Line Items]
Notional amount	1,067,009,000	1,250,803,000
Total derivative assets instruments before netting	3,220,000	4,859,000
Total derivative assets after netting	3,220,000	4,859,000
Total derivative liabilities	511,000	227,000
Forward Purchase Contracts [Member]
Derivatives Fair Value [Line Items]
Notional amount	2,510,700,000	1,996,235,000	$ 4,115,159,000	$ 4,840,707,000
Total derivative assets instruments before netting	11,400,000	4,343,000
Derivative assets, Netting	0	0
Total derivative assets after netting	11,400,000	4,343,000
Total derivative liabilities	1,000	248,000
Forward Sale Contracts [Member]
Derivatives Fair Value [Line Items]
Notional amount	2,297,802,000	2,565,271,000	5,673,414,000	6,148,242,000
Total derivative assets instruments before netting	6,000	387,000
Derivative assets, Netting	0	0
Total derivative assets after netting	6,000	387,000
Total derivative liabilities	8,345,000	2,830,000
MBS Put Options [Member]
Derivatives Fair Value [Line Items]
Notional amount	1,750,000,000	2,375,000,000	950,000,000	925,000,000
Total derivative assets instruments before netting	4,086,000	3,170,000
Derivative assets, Netting	0	0
Total derivative assets after netting	4,086,000	3,170,000
Total derivative liabilities	0	0
Call Options on Interest Rate Futures [Member]
Derivatives Fair Value [Line Items]
Notional amount	150,000,000	0	262,500,000	200,000,000
Total derivative assets instruments before netting	492,000	0
Derivative assets, Netting	0	0
Total derivative assets after netting	492,000	0
Total derivative liabilities	0	0
Put Options on Interest Rate Futures [Member]
Derivatives Fair Value [Line Items]
Notional amount	275,000,000	550,000,000	500,000,000	550,000,000
Total derivative assets instruments before netting	367,000	656,000
Derivative assets, Netting	0	0
Total derivative assets after netting	367,000	656,000
Total derivative liabilities	0	0
Swap Futures [Member]
Derivatives Fair Value [Line Items]
Notional amount	0	275,000,000	$ 150,000,000	$ 150,000,000
Total derivative assets instruments before netting	0	0
Total derivative liabilities	0	0
Bond Futures [Member]
Derivatives Fair Value [Line Items]
Notional amount	450,000,000	0
Total derivative assets instruments before netting	0	0
Total derivative liabilities	0	0
Eurodollar Future Contracts [Member]
Derivatives Fair Value [Line Items]
Notional amount	847,664,000	937,000,000
Total derivative assets instruments before netting	0	0
Total derivative liabilities	$ 0	$ 0

Derivative Activities - Summary

Derivative Activities - Summary of Activity in Notional Amount for Derivative Contracts (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Forward Purchase Contracts [Member]
Derivatives Fair Value [Line Items]
Amount, beginning of quarter	$ 1,996,235,000	$ 4,840,707,000
Additions	19,833,104,000	18,906,029,000
Dispositions/expirations	(19,318,639,000)	(19,631,577,000)
Amount, end of quarter	2,510,700,000	4,115,159,000
Forward Sales Contracts [Member]
Derivatives Fair Value [Line Items]
Amount, beginning of quarter	2,565,271,000	6,148,242,000
Additions	24,410,334,000	24,225,103,000
Dispositions/expirations	(24,677,803,000)	(24,699,931,000)
Amount, end of quarter	2,297,802,000	5,673,414,000
MBS Put Options [Member]
Derivatives Fair Value [Line Items]
Amount, beginning of quarter	2,375,000,000	925,000,000
Additions	4,125,000,000	1,400,000,000
Dispositions/expirations	(4,750,000,000)	(1,375,000,000)
Amount, end of quarter	1,750,000,000	950,000,000
Call Options on Interest Rate Futures [Member]
Derivatives Fair Value [Line Items]
Amount, beginning of quarter	0	200,000,000
Additions	150,000,000	62,500,000
Dispositions/expirations	0	0
Amount, end of quarter	150,000,000	262,500,000
Put Options on Interest Rate Futures [Member]
Derivatives Fair Value [Line Items]
Amount, beginning of quarter	550,000,000	550,000,000
Additions	3,325,000,000	1,750,000,000
Dispositions/expirations	(3,600,000,000)	(1,800,000,000)
Amount, end of quarter	275,000,000	500,000,000
Bond Futures [Member]
Derivatives Fair Value [Line Items]
Amount, beginning of quarter	0
Additions	450,000,000
Dispositions/expirations	0
Amount, end of quarter	450,000,000
Swap Futures [Member]
Derivatives Fair Value [Line Items]
Amount, beginning of quarter	275,000,000	150,000,000
Additions	0	300,000,000
Dispositions/expirations	(275,000,000)	(300,000,000)
Amount, end of quarter	0	150,000,000
Eurodollar Future Sales Contracts [Member]
Derivatives Fair Value [Line Items]
Amount, beginning of quarter	937,000,000	1,351,000,000
Additions	114,597,000	101,000,000
Dispositions/expirations	(203,933,000)	(212,000,000)
Amount, end of quarter	$ 847,664,000	1,240,000,000
MBS Call Options [Member]
Derivatives Fair Value [Line Items]
Amount, beginning of quarter		750,000,000
Additions		0
Dispositions/expirations		(750,000,000)
Amount, end of quarter		0
Treasury Future Buy Contracts [Member]
Derivatives Fair Value [Line Items]
Amount, beginning of quarter		0
Additions		49,300,000
Dispositions/expirations		(49,300,000)
Amount, end of quarter		0
Treasury Future Sale Contracts [Member]
Derivatives Fair Value [Line Items]
Amount, beginning of quarter		0
Additions		49,300,000
Dispositions/expirations		(49,300,000)
Amount, end of quarter		$ 0

Derivative Activities - Summ105

Derivative Activities - Summary of Net Derivative Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Offsetting Assets [Line Items]
Gross amounts of recognized assets	$ 129,458	$ 115,803
Gross amounts offset in the consolidated balance sheet	(6,940)	(1,922)
Total derivative assets after netting	122,518	113,881
Net amounts of assets presented in the consolidated balance sheet	(6,940)	(1,922)
Repurchase Agreement Derivatives [Member]
Offsetting Assets [Line Items]
Gross amounts of recognized assets	5,892	3,748
Gross amounts offset in the consolidated balance sheet	0	0
Total derivative assets after netting	5,892	3,748
CRT Agreement Derivatives [Member]
Offsetting Assets [Line Items]
Gross amounts of recognized assets	103,995	98,640
Gross amounts offset in the consolidated balance sheet	0	0
Total derivative assets after netting	103,995	98,640
Interest Rate Lock Commitments [Member]
Offsetting Assets [Line Items]
Gross amounts of recognized assets	3,220	4,859
Total derivative assets after netting	3,220	4,859
Forward Purchase Contracts [Member]
Offsetting Assets [Line Items]
Gross amounts of recognized assets	11,400	4,343
Gross amounts offset in the consolidated balance sheet	0	0
Total derivative assets after netting	11,400	4,343
Forward Sale Contracts [Member]
Offsetting Assets [Line Items]
Gross amounts of recognized assets	6	387
Gross amounts offset in the consolidated balance sheet	0	0
Total derivative assets after netting	6	387
Derivatives Not Subject To Master Netting Adjustment [Member]
Offsetting Assets [Line Items]
Gross amounts of recognized assets	113,107	107,247
Gross amounts offset in the consolidated balance sheet	0	0
Total derivative assets after netting	113,107	107,247
Derivatives Not Subject To Master Netting Adjustment [Member] | Interest Rate Lock Commitments [Member]
Offsetting Assets [Line Items]
Gross amounts of recognized assets	3,220	4,859
Gross amounts offset in the consolidated balance sheet	0	0
Total derivative assets after netting	3,220	4,859
MBS Put Options [Member]
Offsetting Assets [Line Items]
Gross amounts of recognized assets	4,086	3,170
Gross amounts offset in the consolidated balance sheet	0	0
Total derivative assets after netting	4,086	3,170
Put Options on Interest Rate Futures [Member]
Offsetting Assets [Line Items]
Gross amounts of recognized assets	367	656
Gross amounts offset in the consolidated balance sheet	0	0
Total derivative assets after netting	367	656
Call Options on Interest Rate Futures [Member]
Offsetting Assets [Line Items]
Gross amounts of recognized assets	492	0
Gross amounts offset in the consolidated balance sheet	0	0
Total derivative assets after netting	492	0
Netting [Member]
Offsetting Assets [Line Items]
Gross amounts of recognized assets	0	0
Gross amounts offset in the consolidated balance sheet	(6,940)	(1,922)
Derivatives Subject to Master Netting Arrangements [Member]
Offsetting Assets [Line Items]
Gross amounts of recognized assets	16,351	8,556
Gross amounts offset in the consolidated balance sheet	(6,940)	(1,922)
Total derivative assets after netting	$ 9,411	$ 6,634

Derivative Activities - Summ106

Derivative Activities - Summary of Derivative Assets, Financial Instruments and Collateral Held by Counterparty (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Offsetting Assets [Line Items]
Total derivative assets after netting	$ 122,518	$ 113,881
Financial instruments	0	0
Cash collateral received	0	0
Net amount	122,518	113,881
CRT Agreements [Member]
Offsetting Assets [Line Items]
Total derivative assets after netting	103,995	98,640
Financial instruments	0	0
Cash collateral received	0	0
Net amount	103,995	98,640
Interest Rate Lock Commitments [Member]
Offsetting Assets [Line Items]
Total derivative assets after netting	3,220	4,859
Financial instruments	0	0
Cash collateral received	0	0
Net amount	3,220	4,859
J.P. Morgan Securities LLC [member]
Offsetting Assets [Line Items]
Total derivative assets after netting	6,294	2,020
Financial instruments	0	0
Cash collateral received	0	0
Net amount	6,294	2,020
Deutsche Bank Securities LLC [Member]
Offsetting Assets [Line Items]
Total derivative assets after netting	5,892	3,748
Financial instruments	0	0
Cash collateral received	0	0
Net amount	5,892	3,748
RJ O'Brien & Associates, LLC [Member]
Offsetting Assets [Line Items]
Total derivative assets after netting	859	656
Financial instruments	0	0
Cash collateral received	0	0
Net amount	859	656
Federal National Mortgage Association [Member]
Offsetting Assets [Line Items]
Total derivative assets after netting	1,073	1,606
Financial instruments	0	0
Cash collateral received	0	0
Net amount	1,073	1,606
Barclays Capital Inc. [Member]
Offsetting Assets [Line Items]
Total derivative assets after netting	324	0
Financial instruments	0	0
Cash collateral received	0	0
Net amount	324	0
Credit Suisse Securities (USA) LLC [Member]
Offsetting Assets [Line Items]
Total derivative assets after netting	227	809
Financial instruments	0	0
Cash collateral received	0	0
Net amount	227	809
Mitsubishi UFJ Sec [Member]
Offsetting Assets [Line Items]
Total derivative assets after netting	155	193
Financial instruments	0	0
Cash collateral received	0	0
Net amount	155	193
RBC Capital Markets, L.P. [Member]
Offsetting Assets [Line Items]
Total derivative assets after netting	151	0
Financial instruments	0	0
Cash collateral received	0	0
Net amount	151	0
KGS Alpha Capital Markets LP [Member]
Offsetting Assets [Line Items]
Total derivative assets after netting	131	0
Financial instruments	0	0
Cash collateral received	0	0
Net amount	131	0
PNC Capital Markets LLC [Member]
Offsetting Assets [Line Items]
Total derivative assets after netting	100	0
Financial instruments	0	0
Cash collateral received	0	0
Net amount	100	0
Wells Fargo Securities, LLC [Member]
Offsetting Assets [Line Items]
Total derivative assets after netting	90	146
Financial instruments	0	0
Cash collateral received	0	0
Net amount	90	146
Morgan Stanley & Co. LLC [Member]
Offsetting Assets [Line Items]
Total derivative assets after netting	0	457
Financial instruments	0	0
Cash collateral received	0	0
Net amount	0	457
Other [Member]
Offsetting Assets [Line Items]
Total derivative assets after netting	7	158
Financial instruments	0	0
Cash collateral received	0	0
Net amount	7	158
Citigroup Global Markets Inc. [Member]
Offsetting Assets [Line Items]
Total derivative assets after netting	0	429
Financial instruments	0	0
Cash collateral received	0	0
Net amount	0	429
Jefferies & Company, Inc. [Member]
Offsetting Assets [Line Items]
Total derivative assets after netting	0	160
Financial instruments	0	0
Cash collateral received	0	0
Net amount	$ 0	$ 160

Derivative Activities - Schedul

Derivative Activities - Schedule of Offsetting of Derivative Liabilities and Financial Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	$ 3,417,140	$ 3,184,191
Gross amounts offset in the consolidated balance sheet	(5,221)	(1,999)
Net amounts of liabilities presented in the consolidated balance sheet	3,411,919	3,182,192
Unpaid Principal Balance [Member]
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	3,409,440	3,182,504
Gross amounts offset in the consolidated balance sheet	0	0
Net amounts of liabilities presented in the consolidated balance sheet	3,409,440	3,182,504
Interest Rate Lock Commitments [Member]
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	511	227
Gross amounts offset in the consolidated balance sheet	0	0
Net amounts of liabilities presented in the consolidated balance sheet	511	227
Forward Purchase Contracts [Member]
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	1	248
Gross amounts offset in the consolidated balance sheet	0	0
Net amounts of liabilities presented in the consolidated balance sheet	1	248
Forward Sales Contracts [Member]
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	8,345	2,830
Gross amounts offset in the consolidated balance sheet	0	0
Net amounts of liabilities presented in the consolidated balance sheet	8,345	2,830
Derivatives Not Subject To Master Netting Adjustment [Member]
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	511	227
Gross amounts offset in the consolidated balance sheet	0	0
Net amounts of liabilities presented in the consolidated balance sheet	511	227
Netting [Member]
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	0	0
Gross amounts offset in the consolidated balance sheet	(5,221)	(1,999)
Net amounts of liabilities presented in the consolidated balance sheet	(5,221)	(1,999)
Derivatives Subject to Master Netting Arrangements [Member]
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	8,346	3,078
Gross amounts offset in the consolidated balance sheet	(5,221)	(1,999)
Net amounts of liabilities presented in the consolidated balance sheet	3,125	1,079
Derivative Liabilities Before Netting [Member]
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	8,857	3,305
Gross amounts offset in the consolidated balance sheet	(5,221)	(1,999)
Net amounts of liabilities presented in the consolidated balance sheet	3,636	1,306
Unamortized Debt Issuance Costs [Member]
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	(1,157)	(1,618)
Gross amounts offset in the consolidated balance sheet	0	0
Net amounts of liabilities presented in the consolidated balance sheet	(1,157)	(1,618)
Security Sold Under Agreements to Repurchase [Member]
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	3,408,283	3,180,886
Gross amounts offset in the consolidated balance sheet	0	0
Net amounts of liabilities presented in the consolidated balance sheet	$ 3,408,283	$ 3,180,886

Derivative Activities - Summ108

Derivative Activities - Summary of Derivative Liabilities, Financial Liabilities and Collateral Pledged by Counterparty (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	$ 3,411,919	$ 3,182,192
Gross amounts not offset in the consolidated balance sheet, Financial instruments	(3,408,283)	(3,180,886)
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	3,636	1,306
Interest Rate Lock Commitments [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	511	227
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	511	227
Bank of America, N.A. [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	1,110,861	839,057
Gross amounts not offset in the consolidated balance sheet, Financial instruments	(1,109,449)	(838,771)
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	1,412	286
Credit Suisse Securities (USA) LLC [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	917,667	845,567
Gross amounts not offset in the consolidated balance sheet, Financial instruments	(917,667)	(845,567)
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	0	0
J.P. Morgan Securities LLC [member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	274,748	373,186
Gross amounts not offset in the consolidated balance sheet, Financial instruments	(274,748)	(373,186)
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	0	0
Deutsche Bank Securities LLC [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	266,238	374,526
Gross amounts not offset in the consolidated balance sheet, Financial instruments	(266,238)	(374,526)
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	0	0
Morgan Stanley & Co. LLC [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	231,591	164,530
Gross amounts not offset in the consolidated balance sheet, Financial instruments	(231,227)	(164,530)
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	364	0
Daiwa Capital Markets [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	264,386	153,833
Gross amounts not offset in the consolidated balance sheet, Financial instruments	(264,077)	(153,730)
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	309	103
Citigroup Global Markets Inc. [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	159,593	235,541
Gross amounts not offset in the consolidated balance sheet, Financial instruments	(159,593)	(235,319)
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	0	222
RBC Capital Markets, L.P. [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	93,872	92,014
Gross amounts not offset in the consolidated balance sheet, Financial instruments	(93,872)	(91,805)
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	0	209
Wells Fargo Securities, LLC [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	49,216	50,360
Gross amounts not offset in the consolidated balance sheet, Financial instruments	(49,216)	(50,360)
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	0	0
BNP Paribas [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	43,612	45,411
Gross amounts not offset in the consolidated balance sheet, Financial instruments	(43,353)	(45,411)
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	259	0
Goldman Sachs [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	549	164
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	549	164
Barclays Capital Inc. [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	0	9,374
Gross amounts not offset in the consolidated balance sheet, Financial instruments	0	(9,299)
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	0	75
Other [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	232	20
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	232	20
Unamortized Debt Issuance Costs [Member]
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the consolidated balance sheet	(1,157)	(1,618)
Gross amounts not offset in the consolidated balance sheet, Financial instruments	1,157	1,618
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	0	0
Net amount	$ 0	$ 0

Derivative Activities - Net Gai

Derivative Activities - Net Gains (Losses) Recognized on Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Gain Loss on mortgage 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	$ (14,858)	$ 28,933
Interest expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net gains on derivative financial instruments used as economic hedges	(12)	0
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	1,460	(4,144)
CRT Agreements [Member] | Net gain (loss) on investments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net gains on derivative financial instruments used as economic hedges	24,684	20,307
Interest rate lock commitments and mortgage loans acquired for sale at fair value [Member] | Gain Loss on mortgage loans acquired for sale [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net gains on derivative financial instruments used as economic hedges	32,810	(3,592)
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	$ (20,848)	$ (8,698)

Real Estate Acquired in Sett110

Real Estate Acquired in Settlement of Loans - Summary of Financial Information Relating to REO (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Real Estate [Abstract]
Balance at beginning of quarter	$ 162,865	$ 274,069
Transfers from mortgage loans at fair value and advances	16,363	24,876
Transfer of real estate acquired in settlement of mortgage loans to real estate held for investment	(2,059)	(6,644)
Results of REO:
Valuation adjustments, net	(5,359)	(8,175)
Gain on sale, net	2,133	3,929
Total gain (loss), net	(3,226)	(4,246)
Proceeds from sales	(32,437)	(63,224)
Balance at end of quarter	141,506	$ 224,831
REO pledged to secure assets sold under agreements to repurchase	67,720		$ 76,037
REO held in a consolidated subsidiary whose stock is pledged to secure financings of such properties	37,764		48,495
Real estate pledged to creditors	$ 105,484		$ 124,532

Mortgage Servicing Rights - Sum

Mortgage Servicing Rights - Summary of MSRs Carried at Fair Value (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Servicing Asset At Fair Value Changes In Fair Value [Abstract]
Balance at beginning of quarter		$ 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	0
Balance after reclassification		864,494	64,136
Purchases		0	62
MSRs resulting from mortgage loan sales		66,546	7,478
Due to changes in valuation inputs used in valuation model	[1]	52,611	32
Other changes in fair value	[2]	(26,638)	(2,025)
Change in fair value, Total		25,973	(1,993)
Balance at end of quarter		957,013	$ 69,683
Assets sold under agreements to repurchase		745,965		$ 66,813
Notes payable		195,721		23,471
Total		$ 941,686		$ 90,284
[1]	Principally 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 - 112

Mortgage Servicing Rights - Summary of MSRs Carried at Lower of Amortized Cost or Fair Value (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Balance at beginning of quarter	$ 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	51,210
Amortization	0	(17,858)
Balance at end of quarter	0	639,455
Balance at beginning of quarter	(19,548)	(13,672)
Reduction resulting from change in accounting principle	19,548	0
Reversal of impairment valuation allowance	0	1,504
Balance at end of quarter	0	(12,168)
MSRs, net	0	627,287	$ 753,322
Fair value at beginning of quarter	0	626,334
Fair value at end of quarter	0	662,584
Balance after reclassification	$ 0	$ (13,672)
Assets sold under agreements to repurchase			584,762
Notes payable			156,846
Total			$ 741,608

Mortgage Servicing Rights - 113

Mortgage Servicing Rights - Summary of Net Mortgage Loan Servicing Fees Relating to MSRs (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Transfers And Servicing [Abstract]
Contractually-specified servicing fees	$ 48,732	$ 37,281
Late charges	214	187
Other	1,489	1,037
Net mortgage loan servicing fees	$ 50,435	$ 38,505

Assets Sold Under Agreements114

Assets Sold Under Agreements to Repurchase - Summary of Financial Information Relating to Assets Sold under Agreements to Repurchase (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Assets Sold under Agreements to Repurchase [Line Items]
Weighted-average interest rate	3.20%	2.57%
Average balance	$ 3,077,914,000	$ 3,267,864,000
Total interest expense	24,507,000	22,182,000
Maximum daily amount outstanding	3,655,250,000	$ 4,330,825,000
Unpaid principal balance	3,409,440,000		$ 3,182,504,000
Assets sold under agreements to repurchase, At year end	$ 3,408,283,000		$ 3,180,886,000
Weighted-average interest rate	2.80%		2.77%
Available borrowing capacity, Committed	$ 767,553,000		$ 749,650,000
Available borrowing capacity, Uncommitted	1,673,718,000		2,030,607,000
Available borrowing capacity	2,441,271,000		2,780,257,000
Margin deposits placed with counterparties included in Other assets	40,114,000		28,154,000
Real Estate Held for Investment [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets securing agreements to repurchase	31,899,000		31,128,000
Mortgage service rights [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets securing agreements to repurchase	745,965,000		651,575,000
Assets Sold Under Agreements to Repurchase [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Unamortized debt issuance costs and premiums, net	(1,157,000)		(1,618,000)
Mortgage-backed securities at fair value [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets securing agreements to repurchase	1,436,456,000		989,461,000
Mortgage loans acquired for sale at fair value [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets securing agreements to repurchase	1,097,266,000		1,201,992,000
Mortgage loans at fair value [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets securing agreements to repurchase	459,809,000		760,853,000
Real estate acquired in settlement of loans [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets securing agreements to repurchase	105,484,000		124,532,000
Deposits securing CRT Agreements [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets securing agreements to repurchase	392,453,000		400,778,000
Derivative assets related to CRT Agreements [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets securing agreements to repurchase	$ 24,423,000		$ 26,058,000

Assets Sold Under Agreements115

Assets Sold Under Agreements to Repurchase - Summary of Financial Information Relating to Assets Sold under Agreements to Repurchase (Parenthetical) (Detail) - Assets Sold Under Agreements to Repurchase [Member] - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Assets Sold under Agreements to Repurchase [Line Items]
Amortization of debt issuance premiums	$ 169,000
Amortization of debt issuance costs		$ 2,300,000

Assets Sold Under Agreements116

Assets Sold Under Agreements to Repurchase - Summary of Maturities of Outstanding Assets Sold under Agreements to Repurchase by Facility Maturity Date (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)
Assets Sold under Agreements to Repurchase [Line Items]
Maturity of repurchase agreements	$ 3,409,440
Weighted average maturity (in months)	3 years 9 months 18 days
Within 30 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Maturity of repurchase agreements	$ 1,373,877
Over 30 to 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Maturity of repurchase agreements	1,177,854
Over 90 days to 180 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Maturity of repurchase agreements	231,227
Over 180 days to 1 year [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Maturity of repurchase agreements	441,442
Over one year to two years [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Maturity of repurchase agreements	$ 185,040

Assets Sold Under Agreements117

Assets Sold Under Agreements to Repurchase - Summary of Assets Sold under Agreements to Repurchase by Counterparty (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)
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	$ 60,502
Mortgage acquired for sale Weighted-average repurchase agreement maturity	Apr. 22, 2018
Facility maturity	May 1, 2018
Credit Suisse First Boston Mortgage Capital LLC [Member] | CRT Agreements sold under agreements to repurchase [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 51,226
Weighted average maturity	Apr. 16, 2018
Credit Suisse First Boston Mortgage Capital LLC [Member] | Mortgage loans acquired for sale, mortgage loans, REO and MSRs sold under agreements to repurchase [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 468,728
Mortgage acquired for sale Weighted-average repurchase agreement maturity	Jun. 18, 2018
Facility maturity	Apr. 27, 2018
JPMorgan Chase & Co. [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 8,745
Weighted average maturity	Apr. 8, 2018
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	$ 36,428
Mortgage acquired for sale Weighted-average repurchase agreement maturity	Mar. 14, 2019
Facility maturity	Mar. 14, 2019
Bank of America, N.A. [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 46,492
Weighted average maturity	May 2, 2018
Bank of America, N.A. [Member] | CRT Agreements sold under agreements to repurchase [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 27,592
Weighted average maturity	Apr. 16, 2018
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	$ 10,624
Mortgage acquired for sale Weighted-average repurchase agreement maturity	Apr. 14, 2018
Facility maturity	May 25, 2018
JPMorgan Chase & Co., Maturity in 2018 [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	$ 3,420
Mortgage acquired for sale Weighted-average repurchase agreement maturity	May 18, 2018
Facility maturity	Oct. 12, 2018
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	$ 11,132
Mortgage acquired for sale Weighted-average repurchase agreement maturity	Jun. 17, 2018
Facility maturity	Aug. 24, 2018
Deutsche Bank [Member] | Mortgage loans acquired for sale, mortgage loans, REO and MSRs sold under agreements to repurchase [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 13,282
Mortgage acquired for sale Weighted-average repurchase agreement maturity	Jun. 20, 2018
Facility maturity	Sep. 30, 2018
Daiwa Capital Markets [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 18,151
Weighted average maturity	Apr. 20, 2018
Royal Bank of Canada [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 7,640
Weighted average maturity	Apr. 16, 2018
Wells Fargo, N.A. [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 2,670
Weighted average maturity	Apr. 12, 2018
BNP Paribas Corporate & Institutional Banking [Member] | CRT Agreements sold under agreements to repurchase [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 18,160
Weighted average maturity	Apr. 9, 2018

Mortgage Loan Participation 118

Mortgage Loan Participation Purchase and Sale Agreements - Summary of Mortgage Loan Participation Purchase and Sale Agreements (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
At period end:
Mortgage loan participation purchase and sale agreements, At year end	$ 0		$ 44,488,000
Mortgage Loan Participation Purchase and Sale Agreement [Member]
Mortgage Loan Participation Purchase And Sale Agreement [Line Items]
Weighted-average interest rate	2.49%	2.08%
Average balance	$ 45,561,000	$ 64,498,000
Total interest expense	314,000	366,000
Maximum daily amount outstanding	77,407,000	$ 97,404,000
At period end:
Amount outstanding	0		44,550,000
Unamortized debt issuance costs	0		(62,000)
Mortgage loan participation purchase and sale agreements, At year end	$ 0		$ 44,488,000
Weighted-average interest rate	0.00%		2.82%
Mortgage loans acquired for sale pledged to secure mortgage loan participation purchase and sale agreements	$ 0		$ 47,285,000

Mortgage Loan Participation 119

Mortgage Loan Participation Purchase and Sale Agreements - Summary of Mortgage Loan Participation Purchase and Sale Agreements (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Mortgage Loan Participation Purchase And Sale Agreement [Line Items]
Amortization of debt issuance costs and premiums, net	$ 236	$ 3,596
Mortgage Loan Participation Purchase and Sale Agreement [Member]
Mortgage Loan Participation Purchase And Sale Agreement [Line Items]
Amortization of debt issuance costs and premiums, net	$ 0	$ 31,000

Notes Payable - Additional Info

Notes Payable - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2018	Feb. 01, 2018	Mar. 24, 2017
Amended and Restated Loan and Security Agreement with Citibank, N.A. [Member]
Short-term Debt [Line Items]
Redemption and termination period of debt instrument	2017-12
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 Credit Suisse First Boston Mortgage Capital LLC [Member]
Short-term Debt [Line Items]
Maturity date of debt instrument	Feb. 1, 2020
Maximum [Member] | Amended and Restated Loan and Security Agreement with Citibank, N.A. [Member]
Short-term Debt [Line Items]
Aggregate loan amount			$ 400,000,000
Maximum [Member] | Loan and Security Agreement with Barclays Bank PLC [Member]
Short-term Debt [Line Items]
Aggregate loan amount			$ 170,000,000
Maximum [Member] | Loan and Security Agreement with Credit Suisse First Boston Mortgage Capital LLC [Member]
Short-term Debt [Line Items]
Aggregate loan amount		$ 175,000,000

Notes Payable - Summary of Fina

Notes Payable - Summary of Financial Information Relating to Note Payable (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Debt Instrument [Line Items]
Weighted-average interest rate	0.00%	5.13%
Average balance	$ 0	$ 260,384,000
Total interest expense	0	4,305,000
Carrying value:
Amount outstanding	0
Balance	$ 0
Weighted-average interest rate	0.00%
MSRs pledged to secure notes payable	$ 195,721,000		$ 180,317,000
Notes payable [Member]
Debt Instrument [Line Items]
Maximum daily amount outstanding	0	$ 275,106,000
Carrying value:
Unamortized debt issuance costs	$ 0		$ 0

Notes Payable - Summary of F122

Notes Payable - Summary of Financial Information Relating to Note Payable (Parenthetical) (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Debt Instrument [Line Items]
Amortization of debt issuance costs and premiums, net	$ 236,000	$ 3,596,000
Notes payable [Member]
Debt Instrument [Line Items]
Amortization of debt issuance costs and premiums, net	$ 998,000

Asset-Backed Financing of a 123

Asset-Backed Financing of a Variable Interest Entity at Fair Value - Summary of Financial Information Relating to Asset-Backed Financing of a VIE (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Assets Sold under Agreements to Repurchase [Line Items]
Asset-backed financing of a variable interest entity at fair value	$ 296,982		$ 307,419
Variable Interest Entities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Asset-backed financing of a variable interest entity at fair value	296,982		307,419
Asset-Backed Financing of the VIE at Fair Value [Member] | Variable Interest Entities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Weighted-average fair value	297,682	$ 347,854
Total interest expense	$ 2,296	$ 3,409
Weighted-average effective interest rate	3.54%	3.48%
Asset-backed financing of a variable interest entity at fair value	$ 296,982		307,419
UPB	$ 312,730		$ 316,684
Weighted-average interest rate	3.51%		3.51%

Exchangeable Senior Notes - Add

Exchangeable Senior Notes - Additional Information (Detail) - Exchangeable Senior Notes due May 1, 2020 [Member]	Apr. 30, 2013USD ($)	Mar. 31, 2018USD ($)$ / shares
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
Increased in cash dividend | $ / shares		$ 0.57
Maturity date of debt instrument		May 1, 2020
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	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Debt Instrument [Line Items]
Weighted-average UPB	$ 250,000	$ 250,000
Carrying value:
UPB	250,000		$ 250,000
Exchangeable senior notes	247,471		247,186
Convertible Debt [Member]
Debt Instrument [Line Items]
Total interest expense	3,644	$ 3,627
Carrying value:
Unamortized debt issuance costs	$ (2,529)		$ (2,814)

Liability for Losses under R126

Liability for Losses under Representations and Warranties - Summary of Company's Liability for Losses under Representations and Warranties (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Mortgage Banking [Abstract]
Balance, beginning of quarter	$ 8,678	$ 15,350
Provision for losses:
Pursuant to mortgage loan sales	572	673
Reduction in liability due to change in estimate	(1,042)	(4,576)
Recoveries, net	41	0
Balance, end of quarter	8,249	11,447
UPB of mortgage loans subject to representations and warranties at end of quarter	$ 74,554,838	$ 58,797,849

Commitments and Contingencies -

Commitments and Contingencies - Company's Outstanding Contractual Commitments (Detail) $ in Thousands	Mar. 31, 2018USD ($)
Commitments to purchase mortgage loans:
Commitments to purchase mortgage loans acquired for sale	$ 1,067,009
Commitments to fund Deposits securing CRT agreements	$ 552,957

Shareholders' Equity - Summary

Shareholders' Equity - Summary of Preferred Shares of Benefical Interest (Detail) - USD ($)	Mar. 31, 2018	Dec. 31, 2017	Jul. 31, 2017
Class Of Stock [Line Items]
Number of shares	12,400,000	12,400,000
Liquidation preference	$ 310,000,000	$ 310,000,000
Issuance discount	10,293,000
Carrying value	$ 299,707,000	$ 299,707,000
8.125% Series A Preferred Stock [Member]
Class Of Stock [Line Items]
Number of shares	4,600,000
Liquidation preference	$ 115,000,000
Issuance discount	3,828,000
Carrying value	$ 111,172,000
8.00% Series B Preferred Stock [Member]
Class Of Stock [Line Items]
Number of shares	7,800,000		7,800,000
Liquidation preference	$ 195,000,000
Issuance discount	6,465,000
Carrying value	$ 188,535,000

Shareholders' Equity - Summa129

Shareholders' Equity - Summary of Preferred Shares of Benefical Interest (Parenthetical) (Detail) - $ / shares	Jul. 05, 2017	Mar. 31, 2017	Mar. 31, 2018	Dec. 31, 2017	Jul. 31, 2017
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%		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	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Aug. 31, 2015
Schedule Of Capitalization Equity [Line Items]
Preferred stock, shares issued				12,400,000		12,400,000
Preferred stock, par value				$ 0.01		$ 0.01
Reimbursement agreement effective date				Feb. 1, 2013
Reimbursement paid for every $100 of performance incentive fees earned				$ 10
Performance incentive fees earned				100
Payments of contingent underwriting fees to underwriters				0	$ 0
Initial Public Offering [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, 2019
Management [Member]
Schedule Of Capitalization Equity [Line Items]
Reimbursement of contingent underwriting fee to manager				$ 0	$ 0
Maximum [Member]
Schedule Of Capitalization Equity [Line Items]
Common stock shares Repurchase authorized amount							$ 300,000,000
Reimbursement payable in a 12-month period				1,000,000
Underwriting cost paid				2,900,000
Maximum [Member] | Initial Public Offering [Member]
Schedule Of Capitalization Equity [Line Items]
Reimbursement payable in a 12-month period				2,000,000
Amount paid by underwriters				$ 5,900,000
8.125% Series A Preferred Stock [Member]
Schedule Of Capitalization Equity [Line Items]
Preferred stock, shares issued			4.6		4.6
Cumulative dividend, beneficial interest rate			8.125%	8.125%
Preferred stock, par value			$ 0.01	$ 0.01	$ 0.01
Preferred stock, dividends per share paid				0.51
Preferred stock redemption price per share				$ 25
Statutory Dividend Payment Restrictions Disclosure				The Company pays quarterly cumulative dividends on its 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 Rate [Member] | Date Of Original Issuance To March 14,2024 [Member]
Schedule Of Capitalization Equity [Line Items]
Cumulative dividend, beneficial interest rate			8.125%
Preferred stock, liquidation preference			$ 25		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%
Preferred stock, liquidation preference			$ 25		$ 25
8.00% Series B Preferred Stock [Member]
Schedule Of Capitalization Equity [Line Items]
Preferred stock, shares issued		7,800,000		7,800,000
Cumulative dividend, beneficial interest rate	8.00%			8.00%
Preferred stock, par value		$ 0.01		$ 0.01
Preferred stock redemption price per share				25
8.00% Series B Preferred Stock [Member] | From, and including, the date of original issuance to, but not including, June 15, 2024 [Member]
Schedule Of Capitalization Equity [Line Items]
Cumulative dividend, beneficial interest rate		8.00%
Preferred stock, liquidation preference		$ 25
8.00% Series B Preferred Stock [Member] | From, and including, June 15, 2024 and thereafter [Member]
Schedule Of Capitalization Equity [Line Items]
Cumulative dividend, beneficial interest rate		5.99%
Preferred stock, liquidation preference		$ 25
Preferred stock, dividends per share paid				$ 0.50

Shareholders' Equity - Summa131

Shareholders' Equity - Summary of Share Repurchase Activity (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Equity [Abstract]
Common shares repurchased	671	139
Cost of common shares repurchased	$ 10,719	$ 2,307
Cumulative shares repurchased	14,731
Cumulative cost of shares repurchased	$ 216,625

Net Gain on Mortgage Loans A132

Net Gain on Mortgage Loans Acquired for Sale - Summary of Net Gain on Mortgage Loans Acquired for Sale (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Non cash gain:
Receipt of MSRs in mortgage loan sale transactions	$ 66,546	$ 58,688
Provision for losses relating to representations and warranties provided in mortgage loan sales:
Pursuant to mortgage loans sales	(572)	(673)
Reduction in liability due to change in estimate	(1,042)	(4,576)
Change in fair value of financial instruments held at end of quarter:
Net gain on mortgage loans acquired for sale	7,627	19,025
PennyMac Financial Services, Inc. [Member]
Change in fair value of financial instruments held at end of quarter:
Net gain on mortgage loans acquired for sale	2,641	2,401
Nonaffiliates [Member]
Cash loss:
Mortgage loans	(95,767)	(55,907)
Hedging activities	33,746	16,258
Cash gain, net of effects of cash hedging, on sale of mortgage loans acquired for sale	(62,021)	(39,649)
Non cash gain:
Receipt of MSRs in mortgage loan sale transactions	66,546	58,688
Provision for losses relating to representations and warranties provided in mortgage loan sales:
Pursuant to mortgage loans sales	(572)	(673)
Reduction in liability due to change in estimate	1,042	4,576
Change in fair value of financial instruments held at end of quarter:
IRLCs	(1,924)	4,945
Mortgage loans	2,851	8,587
Hedging derivatives	(936)	(19,850)
Total non cash portion of gain on mortgage loans acquired for sale	(9)	(6,318)
Net gain on mortgage loans acquired for sale	$ 4,986	$ 16,624

Net Gain (Loss) on Investmen133

Net Gain (Loss) on Investments - Summary of Net Gain (Loss) on Investments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
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	$ 18	$ 16,721
Nonaffiliates [Member]
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Mortgage-backed securities	(22,397)	140
CRT Agreements	22,551	18,587
Asset-backed financing of a VIE at fair value	6,183	(24)
Hedging derivatives	1,460	(4,144)
Net gain (loss) on investments	(7,733)	18,091
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	7,751	(1,370)
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]
Mortgage loans at fair value	(5,579)	316
Distressed mortgage loans [Member] | Nonaffiliates [Member]
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Mortgage loans at fair value	$ (9,951)	$ 3,216

Net Mortgage Loan Servicing 134

Net Mortgage Loan Servicing Fees - Summary of Net Loan Servicing Fees (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Components of Net Servicing Fee Income [Line Items]
Servicing fees	$ 50,435	$ 38,505
Effect of MSRs:
Carried at fair value-change in fair value	25,973	(1,993)
Amortization	0	(17,858)
Additions to impairment valuation allowance	0	1,504
Total Effect of MSRs	5,125	(27,046)
Net mortgage loan servicing fees	56,155	11,752
Average servicing portfolio	73,694,438	57,927,056
PennyMac Financial Services, Inc. [Member]
Effect of MSRs:
Net mortgage loan servicing fees	595	292
From PFSI—MSR recapture income	595	292
Nonaffiliates [Member]
Components of Net Servicing Fee Income [Line Items]
Servicing fees	48,732	37,281
Ancillary and other fees	1,703	1,224
Effect of MSRs:
Carried at fair value-change in fair value	25,973	(1,993)
Amortization	0	(17,858)
Additions to impairment valuation allowance	0	1,504
Total Effect of MSRs	5,125	(27,045)
Net mortgage loan servicing fees	55,560	11,460
Nonaffiliates [Member] | Mortgage service rights [Member]
Effect of MSRs:
Losses on hedging derivatives, net	$ (20,848)	$ (8,698)

Net Interest Income - Summary o

Net Interest Income - Summary of Net Interest Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Interest income:
ESS	$ 40,980	$ 48,100
Interest expense:
Total interest expense	24,507	22,182
Notes payable	0	4,305
Interest expense, total	34,816	37,179
Net interest income	6,164	10,921
Convertible Debt [Member]
Interest expense:
Total interest expense	3,644	3,627
PennyMac Financial Services, Inc. [Member]
Interest income:
ESS	3,934	4,647
Interest expense:
Total interest expense	1,976	1,805
Nonaffiliates [Member]
Interest income:
Short-term investments	73	281
Mortgage-backed securities	8,791	6,772
Mortgage loans acquired for sale at fair value	11,332	11,502
Distressed	7,899	19,651
Placement fees relating to custodial funds	4,215	1,071
Deposits securing CRT Agreements	2,031	408
Other	102	39
ESS	37,046	43,453
Interest expense:
Total interest expense	24,507	22,182
Mortgage loan participation purchase and sale agreements	314	366
Notes payable	0	4,305
Asset-backed financings of VIEs at fair value	2,296	3,409
Interest shortfall on repayments of mortgage loans serviced for Agency securitizations	1,594	1,062
Interest on mortgage loan impound deposits	485	423
Interest expense, total	32,840	35,374
Nonaffiliates [Member] | Convertible Debt [Member]
Interest expense:
Total interest expense	3,644	3,627
Nonaffiliates [Member] | Variable Interest Entities [Member]
Interest income:
Mortgage loans at fair value	$ 2,603	$ 3,729

Net Interest Income - Summar136

Net Interest Income - Summary of Net Interest Income (Parenthetical) (Detail) - Master Repurchase Agreement [Member] $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
Schedule Of Investment Income Reported Amounts By Category [Line Items]
Incentives as a reduction to finance mortgage loans included in interest expense	$ 2.4
Maturity date description	The master repurchase agreement has an initial term of six months, renewable for three additional six-month terms at the option of the lender and was renewed for six months on April 18, 2018. There can be no assurance whether the lender will further renew this agreement upon its maturity

Share-Based Compensation Pla137

Share-Based Compensation Plans - Summary of Share-Based Compensation Activity (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total share units granted	245	260
Total fair value of share units granted	$ 3,842	$ 4,003
Total share units vested	220	153
Total share units forfeited	0	0
Compensation expense relating to share-based grants	$ 899	$ 1,527
Restricted Shares Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total share units granted	129	134
Total fair value of share units granted	$ 2,300	$ 2,281
Total share units vested	192	153
Total share units forfeited	0	0
Performance Shares Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total share units granted	116	126
Total fair value of share units granted	$ 1,542	$ 1,722
Total share units vested	28	0
Total share units forfeited	0	0

Other Expenses - Summary of Oth

Other Expenses - Summary of Other Expenses (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other Non operating Income Expense [Line Items]
Total other expenses	$ 2,650	$ 3,503
Common Overhead Allocation from PFSI [Member]
Other Non operating Income Expense [Line Items]
Total other expenses	1,001	1,434
Technology [Member]
Other Non operating Income Expense [Line Items]
Total other expenses	378	318
Insurance [Member]
Other Non operating Income Expense [Line Items]
Total other expenses	305	338
Other [Member]
Other Non operating Income Expense [Line Items]
Total other expenses	$ 966	$ 1,413

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Income Tax [Line Items]
Effective income tax rate	25.50%	(27.10%)
Expense (benefit) from income taxes	$ 9,652	$ (6,129)
Income (loss) before benefit from income taxes	37,838	22,608
Percentage of deduction from taxable income			20.00%
Taxable REIT Subsidiary [Member]
Income Tax [Line Items]
Expense (benefit) from income taxes	9,400	6,600
Income (loss) before benefit from income taxes	$ 34,600	$ 14,800

Earnings Per Share - Summary of

Earnings Per Share - Summary of Basic and Diluted Earnings per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Net income	$ 28,186	$ 28,737
Dividends on preferred shares	(6,234)	(571)
Effect of participating securities—share-based compensation awards	(202)	(298)
Net income attributable to common shareholders	21,750	27,868
Net income attributable to common shareholders	21,750	27,868
Interest on Exchangeable Notes, net of income taxes	2,655	2,186
Diluted net income attributable to common shareholders	$ 24,405	$ 30,054
Weighted-average basic shares outstanding	60,761	66,719
Dilutive securities:
Shares issuable under share-based compensation plan	647	0
Shares issuable pursuant to exchange of the Exchangeable Notes	8,467	8,467
Diluted weighted-average number of shares outstanding	69,875	75,186
Basic earnings per share	$ 0.36	$ 0.42
Diluted earnings per share	$ 0.35	$ 0.40

Earnings Per Share - Summary141

Earnings Per Share - Summary of Potentially Dilutive Shares Excluded from Computation of Diluted Earnings Per Share (Detail) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 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	0	661

Segments - Financial Highlights

Segments - Financial Highlights by Operating Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Net investment income:
Net gain on mortgage loans acquired for sale	$ 7,627	$ 19,025
Net gain (loss) on investments	18	16,721
Net mortgage loan servicing fees	56,155	11,752
Net interest income:
Interest income	40,980	48,100
Interest expense	(34,816)	(37,179)
Net interest income	6,164	10,921
Other income (loss)	5,709	6,055
Net investment income	75,673	64,474
Expenses:
Mortgage loan fulfillment and servicing fees payable to PFSI	22,963	27,056
Management fees	5,696	5,008
Other	9,176	9,802
Total expenses	37,835	41,866
Pre-tax income (loss)	37,838	22,608
Total assets at end of quarter	5,790,486	6,002,946	$ 5,604,933
Correspondent production [Member]
Net investment income:
Net gain on mortgage loans acquired for sale	7,599	19,011
Net gain (loss) on investments	0	0
Net mortgage loan servicing fees	0	0
Net interest income:
Interest income	11,169	11,357
Interest expense	(6,798)	(7,901)
Net interest income	4,371	3,456
Other income (loss)	7,073	8,317
Net investment income	19,043	30,784
Expenses:
Mortgage loan fulfillment and servicing fees payable to PFSI	11,944	16,575
Management fees	0	0
Other	469	1,737
Total expenses	12,413	18,312
Pre-tax income (loss)	6,630	12,472
Total assets at end of quarter	1,141,457	1,292,513
Credit Sensitive Strategies [Member]
Net investment income:
Net gain on mortgage loans acquired for sale	28	14
Net gain (loss) on investments	12,414	21,994
Net mortgage loan servicing fees	7	14
Net interest income:
Interest income	10,208	20,321
Interest expense	(10,664)	(14,272)
Net interest income	(456)	6,049
Other income (loss)	(1,389)	(2,268)
Net investment income	10,604	25,803
Expenses:
Mortgage loan fulfillment and servicing fees payable to PFSI	3,085	4,348
Management fees	0	0
Other	3,913	2,028
Total expenses	6,998	6,376
Pre-tax income (loss)	3,606	19,427
Total assets at end of quarter	1,485,492	2,137,531
Interest Rate Sensitive Strategies [Member]
Net investment income:
Net gain on mortgage loans acquired for sale	0	0
Net gain (loss) on investments	(12,396)	(5,273)
Net mortgage loan servicing fees	56,148	11,738
Net interest income:
Interest income	19,428	16,102
Interest expense	(17,354)	(15,006)
Net interest income	2,074	1,096
Other income (loss)	0	0
Net investment income	45,826	7,561
Expenses:
Mortgage loan fulfillment and servicing fees payable to PFSI	7,934	6,133
Management fees	0	0
Other	108	684
Total expenses	8,042	6,817
Pre-tax income (loss)	37,784	744
Total assets at end of quarter	2,989,692	2,432,419
Corporate [Member]
Net investment income:
Net gain on mortgage loans acquired for sale	0	0
Net gain (loss) on investments	0	0
Net mortgage loan servicing fees	0	0
Net interest income:
Interest income	175	320
Interest expense	0	0
Net interest income	175	320
Other income (loss)	25	6
Net investment income	200	326
Expenses:
Mortgage loan fulfillment and servicing fees payable to PFSI	0	0
Management fees	5,696	5,008
Other	4,686	5,353
Total expenses	10,382	10,361
Pre-tax income (loss)	(10,182)	(10,035)
Total assets at end of quarter	$ 173,845	$ 140,483

Supplemental Cash Flow Infor143

Supplemental Cash Flow Information - Summary of Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Additional Cash Flow Elements And Supplemental Cash Flow Information [Abstract]
Income tax payments, net of refunds	$ 0	$ 31
Interest payments	32,112	35,838
Cumulative effect on accumulated deficit of conversion to fair value accounting	19,713	0
Non-cash investing activities:
Capitalization of servicing advances pursuant to mortgage loan modifications	1,677	6,349
Receipt of excess servicing spread pursuant to recapture agreement with PennyMac Financial Services, Inc.	904	1,573
Transfer of mortgage loans and advances to real estate acquired in settlement of loans	16,363	24,876
Transfer of real estate acquired in settlement of mortgage loans to real estate held for investment	2,059	6,644
Receipt of mortgage servicing rights as proceeds from sales of mortgage loans	66,546	58,688
Non-cash financing activities:
Recognition of financing premium arising from repurchase agreement derivatives	2,164	0
Dividends declared, not paid	$ 28,818	$ 31,652

Regulatory Capital and Liqui144

Regulatory Capital and Liquidity Requirements - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2018USD ($)
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]
Minimum net worth amount	$ 2,500,000
Basis point	0.25%
Number of residential mortgage loans served	1-4
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]
Tangible net worth/ total assets ratio	6.00%

Regulatory Capital and Liqui145

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	Mar. 31, 2018	Dec. 31, 2017
Capital Requirements By Agencies [Line Items]
Net Worth, Actual	$ 527,072	$ 487,535
Net Worth, Required	$ 190,654	$ 182,818
Tangible Net Worth / Total Assets Ratio, Actual	14.00%	12.00%
Tangible Net Worth / Total Assets Ratio, Required	6.00%	6.00%
Liquidity, Actual	$ 72,381	$ 73,252
Liquidity, Required	$ 26,342	$ 25,245

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) - USD ($)	Apr. 25, 2018	Apr. 17, 2018	Aug. 18, 2017
Deutsche Bank [Member] | Maximum [Member] | Repurchase Agreement [Member]
Subsequent Event [Line Items]
Aggregate loan amount			$ 500,000,000
Subsequent Event [Member] | Secured Term Notes [Member]
Subsequent Event [Line Items]
Aggregate loan amount	$ 450,000,000
Debt instrument payable start date	2018-05
Maturity date of debt instrument	Apr. 25, 2023
Debt instrument extended maturity date subject to term note indenture	Apr. 25, 2025
Subsequent Event [Member] | Secured Term Notes [Member] | LIBOR [Member]
Subsequent Event [Line Items]
Debt instrument, description of variable rate basis	one-month
Debt instrument interest rate spread	2.35%
Subsequent Event [Member] | Royal Bank of Canada [Member] | Security Sold Under Agreements to Repurchase [Member] | Maximum [Member]
Subsequent Event [Line Items]
Aggregate loan amount		$ 100,000,000
Subsequent Event [Member] | Deutsche Bank [Member] | Maximum [Member] | Repurchase Agreement [Member]
Subsequent Event [Line Items]
Aggregate loan amount		$ 750,000,000