Chimera Investment (CIM) 10-K 21 Feb 19 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2018	Jan. 31, 2019	Jun. 30, 2018
Document And Entity Information [Abstract]
Entity Registrant Name	CHIMERA INVESTMENT CORP
Trading Symbol	CIM
Entity Central Index Key	1,409,493
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Document Type	10-K
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding (in shares)		187,053,396
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity Public Float			$ 3,379,832,597

CONSOLIDATED STATEMENTS OF FINA

CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017
Cash and cash equivalents		$ 47,486	$ 63,569
Non-Agency RMBS, at fair value		2,486,130	2,851,316
Agency MBS, at fair value		12,188,950	4,364,828
Loans held for investment, at fair value		12,572,581	13,678,263
Accrued interest receivable		123,442	100,789
Other assets		252,582	114,391
Derivatives, at fair value, net		37,468	48,914
Total assets	[1]	27,708,639	21,222,070
Liabilities:
Repurchase agreements ($15.8 billion and $8.8 billion, pledged as collateral, respectively)		14,030,465	7,250,452
Securitized debt, collateralized by Non-Agency RMBS ($1.0 billion and $1.6 billion pledged as collateral, respectively)		159,955	205,780
Securitized debt at fair value, collateralized by loans held for investment ($12.3 billion and $13.3 billion pledged as collateral, respectively)		8,455,376	9,388,657
Payable for investments purchased		1,136,157	567,440
Accrued interest payable		110,402	61,888
Dividends payable		95,986	95,365
Accounts payable and other liabilities		16,469	17,191
Derivatives, at fair value, net		0	320
Total liabilities	[1]	24,004,810	17,587,093
Commitments and Contingencies (See Note 15)
Stockholders' Equity:
Common stock: par value $0.01 per share; 300,000,000 shares authorized, 187,052,398 and 187,809,288 shares issued and outstanding, respectively		1,871	1,878
Additional paid-in-capital		4,072,093	3,826,691
Accumulated other comprehensive income		626,832	796,902
Cumulative earnings		3,379,489	2,967,852
Cumulative distributions to stockholders		(4,376,748)	(3,958,534)
Total stockholders' equity		3,703,829	3,634,977
Total liabilities and stockholders' equity		27,708,639	21,222,070
Preferred Class A
Stockholders' Equity:
Preferred Stock, par value of $0.01 per share, 100,000,000 shares authorized:		58	58
Preferred Class B
Stockholders' Equity:
Preferred Stock, par value of $0.01 per share, 100,000,000 shares authorized:		130	130
Series C Preferred Stock Par Value
Stockholders' Equity:
Preferred Stock, par value of $0.01 per share, 100,000,000 shares authorized:		$ 104	$ 0
[1]	The Company's consolidated statements of financial condition include assets of consolidated variable interest entities (“VIEs”) that can only be used to settle obligations and liabilities of the VIE for which creditors do not have recourse to the primary beneficiary (Chimera Investment Corporation). As of December 31, 2018 and December 31, 2017, total assets of consolidated VIEs were $13,392,951 and $14,987,464, respectively, and total liabilities of consolidated VIEs were $8,652,158 and $9,631,820, respectively. See Note 8 for further discussion.

CONSOLIDATED STATEMENTS OF FI_2

CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Preferred stock, par value (usd per share)	$ 0.01	$ 0.01
Preferred Stock, shares authorized (shares)	100,000,000	100,000,000
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (shares)	300,000,000	300,000,000
Common stock, shares issued (shares)	187,052,398	187,809,288
Common stock, shares outstanding (shares)	187,052,398	187,809,288
Repurchase Agreements | Residential Mortgage-Backed Securities
Securities pledged as collateral	$ 15,800,000,000	$ 8,788,680,000
Variable Interest Entities, Primary Beneficiary, Aggregated Disclosure
Assets	13,392,951,000	14,987,464,000
Liabilities	8,652,158,000	9,631,820,000
Securitized Loans | Non-agency MBS
Securities pledged as collateral	1,000,000,000	1,600,000,000
Securitized Loans | Loans Held for Investment at Fair Value
Securities pledged as collateral	$ 12,300,000,000	$ 13,300,000,000
Preferred Class A
Preferred Stock, shares issued (shares)	5,800,000	5,800,000
Preferred Stock, shares outstanding (shares)	5,800,000	5,800,000
Preferred Stock, liquidation preference	$ 145,000	$ 145,000
Preferred stock, dividend rate (percent)	8.00%	8.00%
Preferred Class B
Preferred Stock, shares issued (shares)	13,000,000	13,000,000
Preferred Stock, shares outstanding (shares)	13,000,000	13,000,000
Preferred Stock, liquidation preference	$ 325,000	$ 325,000
Preferred stock, dividend rate (percent)	8.00%	8.00%
Series C Preferred Stock Par Value
Preferred stock, par value (usd per share)	$ 0.01
Preferred Stock, shares issued (shares)	10,400,000	0
Preferred Stock, shares outstanding (shares)	10,400,000	0
Preferred Stock, liquidation preference	$ 260,000	$ 260,000
Preferred stock, dividend rate (percent)	7.75%	7.75%

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net interest income:
Interest income	[1]	$ 1,273,316,000	$ 1,138,758,000	$ 934,068,000
Interest expense	[2]	679,108,000	532,748,000	347,857,000
Net interest income		594,208,000	606,010,000	586,211,000
Other-than-temporary impairments:
Total other-than-temporary impairment losses		(2,556,000)	(5,169,000)	(9,589,000)
Portion of loss recognized in other comprehensive income (loss)		(19,235,000)	(56,687,000)	(48,398,000)
Net other-than-temporary credit impairment losses		(21,791,000)	(61,856,000)	(57,987,000)
Other investment gains (losses):
Net unrealized gains (losses) on derivatives		(141,162,000)	47,976,000	50,093,000
Realized gains (losses) on terminations of interest rate swaps		0	(16,143,000)	(60,616,000)
Net realized gains (losses) on derivatives		18,369,000	(25,645,000)	(44,886,000)
Net gains (losses) on derivatives		(122,793,000)	6,188,000	(55,409,000)
Net unrealized gains (losses) on financial instruments at fair value		46,632,000	111,410,000	59,552,000
Net realized gains (losses) on sales of investments		(2,743,000)	9,123,000	18,155,000
Gains (losses) on extinguishment of debt		26,376,000	(35,274,000)	(477,000)
Total other gains (losses)		(52,528,000)	91,447,000	21,821,000
Other income:
Other income		0	0	95,000,000
Total other income		0	0	95,000,000
Other expenses:
Compensation and benefits		35,114,000	30,212,000	26,901,000
General and administrative expenses		23,936,000	17,650,000	17,516,000
Servicing fees		40,773,000	41,690,000	31,178,000
Deal expenses		8,338,000	21,273,000	17,424,000
Total other expenses		108,161,000	110,825,000	93,019,000
Income (loss) before income taxes		411,728,000	524,776,000	552,026,000
Income taxes		91,000	108,000	83,000
Net income (loss)		411,637,000	524,668,000	551,943,000
Dividends on preferred stock		43,197,000	33,484,000	2,449,000
Net income (loss) available to common shareholders		$ 368,440,000	$ 491,184,000	$ 549,494,000
Net income (loss) per share available to common shareholders:
Basic (usd per share)		$ 1.97	$ 2.62	$ 2.93
Diluted (usd per share)		$ 1.96	$ 2.61	$ 2.92
Weighted average number of common shares outstanding:
Basic (shares)		187,146,170	187,780,355	187,728,634
Diluted (shares)		187,748,862	188,287,320	188,024,838
[1]	Includes interest income of consolidated VIEs of $904,830, $914,022 and $678,623 for the years ended December 31, 2018, 2017 and 2016 respectively. See Note 8 to consolidated financial statements for further discussion.
[2]	Includes interest expense of consolidated VIEs of $395,255, $390,858 and $249,708 for the years ended December 31, 2018, 2017 and 2016, respectively . See Note 8 to consolidated financial statements for further discussion.

CONSOLIDATED STATEMENTS OF OP_2

CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - Non Agency Residential Mortgage Backed Securities And Securitized Loans - Variable Interest Entities, Primary Beneficiary - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest income, assets of consolidated VIEs	$ 904,830	$ 904,830	$ 914,022	$ 678,623
Interest expense, non-recourse liabilities of VIEs	$ 395,255	$ 395,255	$ 390,858	$ 249,708

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Comprehensive income (loss):
Net income (loss)	$ 411,637	$ 524,668	$ 551,943
Other comprehensive income:
Unrealized gains (losses) on available-for-sale securities, net	(185,570)	24,218	(88,527)
Reclassification adjustment for net losses included in net income for other-than-temporary credit impairment losses	21,791	61,856	57,987
Reclassification adjustment for net realized losses (gains) included in net income	(6,291)	(7,278)	(25,145)
Other comprehensive income (loss)	(170,070)	78,796	(55,685)
Comprehensive income (loss) before preferred stock dividends	241,567	603,464	496,258
Dividends on preferred stock	43,197	33,484	2,449
Comprehensive income (loss) available to common stock shareholders	$ 198,370	$ 569,980	$ 493,809

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock Par Value	Additional Paid-in Capital	Accumulated Other Comprehensive Income	Cumulative Earnings	Cumulative Distributions to Stockholders	Series A Preferred Stock Par Value	Series A Preferred Stock Par ValuePreferred Stock	Series B Preferred Stock Par Value	Series B Preferred Stock Par ValuePreferred Stock	Series C Preferred Stock Par Value	Series C Preferred Stock Par ValuePreferred Stock
Beginning Balance at Dec. 31, 2015	$ 2,946,188	$ 1,877	$ 3,366,566	$ 773,791	$ 1,891,241	$ (3,087,287)		$ 0		$ 0		$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	551,943				551,943
Other comprehensive income (loss)	(55,685)			(55,685)
Stock based compensation	2,206		2,206
Common dividends declared	(458,735)					(458,735)
Preferred dividends declared	(2,449)					(2,449)
Issuance of preferred stock	140,065		140,007					58
Ending Balance at Dec. 31, 2016	3,123,533	1,877	3,508,779	718,106	2,443,184	(3,548,471)		58		0		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	524,668				524,668
Other comprehensive income (loss)	78,796			78,796
Stock based compensation	3,614	1	3,613
Common dividends declared	(376,579)					(376,579)
Preferred dividends declared	(33,484)					(33,484)			$ (22,000)
Issuance of preferred stock	314,429		314,299							130
Ending Balance at Dec. 31, 2017	3,634,977	1,878	3,826,691	796,902	2,967,852	(3,958,534)		58		130		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	411,637				411,637
Other comprehensive income (loss)	(170,070)			(170,070)
Repurchase of common stock	(14,834)	(8)	(14,826)
Stock based compensation	8,797	1	8,796
Common dividends declared	(375,017)					(375,017)
Preferred dividends declared	(43,197)					(43,197)	$ (12,000)		$ (26,000)		$ (6,000)
Issuance of preferred stock	251,536		251,432									104
Ending Balance at Dec. 31, 2018	$ 3,703,829	$ 1,871	$ 4,072,093	$ 626,832	$ 3,379,489	$ (4,376,748)		$ 58		$ 130		$ 104

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Cash Flows From Operating Activities:
Net income	$ 411,637	$ 524,668	$ 551,943
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
(Accretion) amortization of investment discounts/premiums, net	28,633	(25,422)	(3,127)
Accretion (amortization) of deferred financing costs and securitized debt discounts/premiums, net	(13,124)	7,395	1,543
Amortization of swaption premium	1,476	6,269	6,559
Net unrealized losses (gains) on derivatives	141,162	(47,976)	(50,093)
Margin (paid) received on derivatives	(320,899)	31,442	56,050
Net unrealized losses (gains) on financial instruments at fair value	(46,632)	(111,410)	(59,552)
Net realized losses (gains) on sales of investments	2,743	(9,123)	(18,155)
Net other-than-temporary credit impairment losses	21,791	61,856	57,987
(Gain) loss on extinguishment of debt	(26,376)	35,274	477
Equity-based compensation expense	8,797	3,614	2,204
Changes in operating assets:
Decrease (increase) in accrued interest receivable, net	(22,652)	(21,091)	(13,450)
Decrease (increase) in other assets	63,235	18,080	3,994
Changes in operating liabilities:
Increase (decrease) in accounts payable and other liabilities	(722)	498	5,290
Increase (decrease) in accrued interest payable, net	48,515	13,217	11,237
Net cash provided by (used in) operating activities	297,584	487,291	552,907
Cash Flows From Investing Activities:
Acquisition of investments in consolidated VIEs	0	(398,261)	0
Net cash provided by (used in) investing activities	(6,026,067)	(4,331,009)	(1,270,560)
Cash Flows From Financing Activities:
Proceeds from repurchase agreements	71,279,975	44,120,574	34,202,707
Payments on repurchase agreements	(64,499,287)	(42,471,025)	(36,041,143)
Net proceeds from preferred stock offerings	251,536	314,429	140,065
Payments on repurchase of common stock	(14,834)	0	0
Proceeds from securitized debt borrowings, collateralized by loans held for investment	1,769,539	5,152,469	4,797,255
Payments on securitized debt borrowings, collateralized by loans held for investment	(2,613,038)	(2,844,132)	(1,668,670)
Payments on securitized debt borrowings, collateralized by Non-Agency RMBS	(43,898)	(131,039)	(194,634)
Common dividends paid	(374,396)	(375,771)	(454,275)
Preferred dividends paid	(43,197)	(35,932)	0
Net cash provided by (used in) financing activities	5,712,400	3,729,573	781,305
Net increase (decrease) in cash and cash equivalents	(16,083)	(114,145)	63,652
Cash and cash equivalents at beginning of period	63,569	177,714	114,062
Cash and cash equivalents at end of period	47,486	63,569	177,714
Supplemental disclosure of cash flow information:
Interest received	1,279,297	1,092,245	917,491
Interest paid	643,717	512,133	335,077
Non-cash investing activities:
Payable for investments purchased	1,136,157	567,440	520,532
Net change in unrealized gain (loss) on available-for sale securities	(170,070)	78,796	(55,685)
Retained beneficial interests	39,844	0	0
Acquisition of securities in Consolidated VIEs
Securitized loans held for investment, at fair value	0	419,222	0
Securitized debt at fair value	0	(20,961)	0
Non-cash financing activities:
Dividends declared, not yet paid	95,986	95,365	94,557
Preferred dividends accrued	0	0	2,449
Agency MBS portfolio
Cash Flows From Investing Activities:
Purchases	(7,917,661)	(1,326,178)	(1,040,290)
Sales	16,184	743,937	2,570,025
Principal payments	524,989	423,506	649,961
Non-agency RMBS Portfolio
Cash Flows From Investing Activities:
Purchases	(133,247)	(15,262)	(203,400)
Sales	19,928	5,045	95,399
Principal payments	521,109	568,339	532,701
Loans held for investment
Cash Flows From Investing Activities:
Sales	754,806	0	0
Principal payments	1,859,155	1,788,408	1,022,414
Purchases	$ (1,671,330)	$ (6,120,543)	$ (4,897,370)

Organization

Organization	12 Months Ended
	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	Organization Chimera Investment Corporation, or the Company, was organized in Maryland on June 1, 2007. The Company commenced operations on November 21, 2007 when it completed its initial public offering. The Company elected to be taxed as a real estate investment trust, or REIT, under the Internal Revenue Code of 1986, as amended, and regulations promulgated thereunder, or the Code. The Company conducts its operations through various subsidiaries including subsidiaries it treats as taxable REIT subsidiaries, or TRSs. In general, a TRS may hold assets and engage in activities that the Company cannot hold or engage in directly and generally may engage in any real estate or non-real estate related business. The Company currently has nine wholly owned direct subsidiaries: Chimera RMBS Whole Pool LLC, and Chimera RMBS LLC formed in June 2009; CIM Trading Company LLC, or CIM Trading, formed in July 2010; Chimera Funding TRS LLC, or CIM Funding TRS, a TRS formed in October 2013, Chimera CMBS Whole Pool LLC and Chimera RMBS Securities LLC formed in March 2015; Chimera Insurance Company, LLC formed in July 2015; Chimera RR Holding LLC formed in April 2016, and Anacostia LLC, a TRS formed in June 2018.

Summary of the Significant Acco

Summary of the Significant Accounting Policies	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Summary of the Significant Accounting Policies	Summary of the Significant Accounting Policies (a) Basis of Presentation and Consolidation The accompanying consolidated financial statements and related notes of the Company have been prepared in accordance with accounting principles generally accepted in the United States, or GAAP. In the opinion of management, all adjustments considered necessary for a fair presentation of the Company's financial position, results of operations and cash flows have been included. Certain prior period amounts have been reclassified to conform to the current period's presentation. The consolidated financial statements include, the Company’s accounts, the accounts of its wholly-owned subsidiaries, and variable interest entities, or VIEs, in which the Company is the primary beneficiary. All intercompany balances and transactions have been eliminated in consolidation. The Company uses securitization trusts considered to be VIEs in its securitization and re-securitization transactions. VIEs are defined as entities in which equity investors (i) do not have the characteristics of a controlling financial interest, or (ii) do not have sufficient equity at risk for the entity to finance its activities without additional subordinated financial support from other parties. The entity that consolidates a VIE is known as its primary beneficiary, and is generally the entity with (i) the power to direct the activities that most significantly impact the VIEs’ economic performance, and (ii) the right to receive benefits from the VIE or the obligation to absorb losses of the VIE that could be significant to the VIE. For VIEs that do not have substantial on-going activities, the power to direct the activities that most significantly impact the VIEs’ economic performance may be determined by an entity’s involvement with the design and structure of the VIE. The trusts are structured as entities that receive principal and interest on the underlying collateral and distribute those payments to the security holders. The assets held by the securitization entities are restricted in that they can only be used to fulfill the obligations of the securitization entity. The Company’s risks associated with its involvement with these VIEs are limited to its risks and rights as a holder of the security it has retained. Determining the primary beneficiary of a VIE requires judgment. The Company determined that for the securitizations it consolidates, its ownership provides the Company with the obligation to absorb losses or the right to receive benefits from the VIE that could be significant to the VIE. In addition, the Company has the power to direct the activities of the VIEs that most significantly impact the VIEs’ economic performance, or power, such as rights to direct servicer activity or the Company was determined to have power in connection with its involvement with the structure and design of the VIE. The Company’s interest in the assets held by these securitization vehicles, which are consolidated on the Company’s Consolidated Statements of Financial Condition, is restricted by the structural provisions of these trusts, and a recovery of the Company’s investment in the vehicles will be limited by each entity’s distribution provisions. The liabilities of the securitization vehicles, which are also consolidated on the Company’s Consolidated Statements of Financial Condition, are non-recourse to the Company, and can only be satisfied from each securitization vehicle’s respective asset pool. The assets of securitization entities are comprised of residential mortgage backed securities (or RMBS), or residential mortgage loans. See Notes 3, 4 and 8 for further discussion of the characteristics of the securities and loans in the Company’s portfolio. (b) Statements of Financial Condition Presentation The Company’s Consolidated Statements of Financial Condition include both the Company’s direct assets and liabilities and the assets and liabilities of consolidated securitization vehicles. Assets of each consolidated VIE can only be used to satisfy the obligations of that VIE, and the liabilities of consolidated VIEs are non-recourse to the Company. The Company is not obligated to provide, nor does it intend to provide, any financial support to these consolidated securitization vehicles. The notes to the consolidated financial statements describe the Company’s assets and liabilities including the assets and liabilities of consolidated securitization vehicles. See Note 8 for additional information related to the Company’s investments in consolidated securitization vehicles. (c) Cash and Cash Equivalents Cash and cash equivalents include cash on hand and cash deposited overnight in money market funds, which are not bank deposits and are not insured or guaranteed by the Federal Deposit Insurance Corporation. There were no restrictions on cash and cash equivalents at December 31, 2018 and December 31, 2017 . (d) Agency and Non-Agency Mortgage-Backed Securities The Company invests in mortgage backed securities, or MBS, representing interests in obligations backed by pools of mortgage loans. The Company delineates between Agency MBS and Non-Agency MBS as follows: (1) Agency MBS are mortgage pass-through certificates, collateralized mortgage obligations, or CMOs, and other MBS representing interests in or obligations backed by pools of mortgage loans issued or guaranteed by agencies of the U.S. Government, such as Ginnie Mae, or federally chartered corporations such as Freddie Mac or Fannie Mae where principal and interest repayments are guaranteed by the respective agency of the U.S. Government or federally chartered corporation; and (2) Non-Agency MBS are not issued or guaranteed by a U.S. Government Agency or other institution and are subject to credit risk. Repayment of principal and interest on Non-Agency MBS is not guaranteed and it is subject to the performance of the mortgage loans or MBS collateralizing the obligation. The Company also invests in Interest Only Agency MBS strips and Interest Only Non-Agency RMBS strips, or IO MBS strips. IO MBS strips represent the Company’s right to receive a specified proportion of the contractual interest flows of the collateral. Interest income on IO MBS strips is accrued based on the outstanding notional balance and the security’s contractual terms, and amortization of any premium is calculated in accordance with the Financial Accounting Standards Board, or FASB, Accounting Standards Codification, or ASC, 325-40, Beneficial Interests in Securitized Financial Assets, or ASC 325-40. The Company accounts for IO MBS strips at fair value with changes in fair value recognized in the Company’s Consolidated Statements of Operations. The Company classifies its MBS as available-for-sale and records investments at estimated fair value as described in Note 5 of these consolidated financial statements. The Company includes unrealized gains and losses considered to be temporary on certain MBS in Other comprehensive income, or OCI, in the Consolidated Statements of Operations. For IO MBS strips and certain other MBS investments, the Company carries these investments at fair value with changes in fair value included in earnings in the Consolidated Statements of Operations. From time to time, as part of the overall management of its portfolio, the Company may sell any of its investments and recognize a realized gain or loss as a component of earnings in the Consolidated Statements of Operations utilizing the average cost method. The Company’s accounting policy for interest income and impairment related to its MBS is as follows: Interest Income Recognition The recognition of interest income on MBS securities varies depending on the characteristics of the security as follows: Agency MBS and Non-Agency RMBS of High Credit Quality FASB ASC 310-20, Nonrefundable Fees and Other Costs, or ASC 310-20, is applied to the recognition of interest income for the following securities: • Certain Agency MBS • Non-Agency RMBS that meet all of the following conditions at the acquisition date (referred to hereafter as “Non-Agency RMBS of High Credit Quality”): 1. Rated AA or higher by a nationally recognized credit rating agency using the lowest rating available; 2. The Company expects to collect all of the security's contractual cash flows; and 3. The security cannot be contractually prepaid such that the Company would not recover substantially all of its recorded investment. Under ASC 310-20, interest income, including premiums and discounts associated with the acquisition of these securities, is recognized over the life of such securities using the interest method based on the contractual cash flows of the security. In applying the interest method, the Company considers estimates of future principal prepayments in the calculation of the effective yield. Differences that arise between previously anticipated prepayments and actual prepayments received, as well as changes in future prepayment assumptions, result in a recalculation of the effective yield on the security. This recalculation of the effective yield is updated on a quarterly basis. Upon a recalculation of the effective yield, the investment in the security is adjusted to the amount that would have existed had the new effective yield been retrospectively applied since acquisition with a corresponding charge or credit to interest income. The Agency MBS, for which we have elected fair value option, we apply FASB ASC 325-40. For these securities accounted for under ASC 325-40, any positive or adverse change in cash flows results in a prospective increase or decrease in the effective interest rate used to recognize interest income. Non-Agency RMBS Not of High Credit Quality Non-Agency RMBS purchased at a discount and not of high credit quality at the time of purchase are accounted for under ASC 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality, or ASC 310-30, or ASC 325-40 (referred to hereafter as “Non-Agency RMBS Not of High Credit Quality”). Non-Agency RMBS are accounted for under ASC 310-30 if the following conditions are met as of the acquisition date: 1. There is evidence of deterioration in credit quality of the security from its inception; and 2. It is probable that the Company will be unable to collect all contractual cash flows of the security. Non-Agency RMBS that are not within the scope of ASC 310-30 are accounted for under ASC 325-40 if at the acquisition date: 1. The security is not of high credit quality (defined as rated below AA or is unrated), or 2. The security can contractually be prepaid or otherwise settled in such a way that the Company would not recover substantially all of its recorded investment. Interest income on Non-Agency RMBS Not of High Credit Quality is recognized using the interest method based on management’s estimates of cash flows expected to be collected. The effective interest rate on these securities is based on management’s estimate for each security of the projected cash flows, which are estimated based on observation of current market information and include assumptions related to fluctuations in prepayment speeds and the timing and amount of credit losses. On a quarterly basis, the Company reviews and, if appropriate, makes adjustments to its cash flow projections based on inputs and analyses received from external sources, internal models, and the Company’s judgments about prepayment rates, the timing and amount of credit losses, and other factors. Changes in the amount or timing of cash flows from those originally projected, or from those estimated at the last evaluation date, are considered to be either positive changes or adverse changes. For securities accounted for under ASC 325-40, any positive or adverse change in cash flows that does not result in the recognition of an other-than-temporary impairment, or OTTI, results in a prospective increase or decrease in the effective interest rate used to recognize interest income. For securities accounted for under ASC 310-30, only significant positive changes are reflected prospectively in the effective interest rate used to recognize interest income. Under ASC 310-30, adverse changes in cash flows expected to be collected for Non-Agency RMBS, in an unrealized loss position, generally result in recognition of an OTTI with no change in the effective interest rate used to recognize interest income. Impairment Considerations Applicable to certain MBS When the fair value of an available-for-sale MBS is less than its amortized cost, the security is considered impaired. On a quarterly basis, the Company evaluates its securities for OTTI. If the Company intends to sell an impaired security, or it is more-likely-than-not that the Company will be required to sell an impaired security before its anticipated recovery, then the Company must recognize an OTTI through a charge to earnings equal to the entire difference between the investment’s amortized cost and its fair value at the measurement date. If the Company does not intend to sell an impaired security and it is not more-likely-than-not that it would be required to sell an impaired security before recovery, the Company must further evaluate the security for impairment due to credit losses. The credit component of OTTI is recognized in earnings and the remaining component is recorded as a component of OCI. Following the recognition of an OTTI through earnings, a new amortized cost basis is established for the security and subsequent recovery in fair value may not be adjusted through current earnings. Subsequent recoveries are amortized into income over the remaining life of the security as an adjustment to yield. When evaluating whether the Company intends to sell an impaired security or will more-likely-than-not be required to sell an impaired security before recovery, the Company makes judgments that consider among other things, its liquidity, leverage, contractual obligations, and targeted investment strategy to determine its intent and ability to hold the investments that are deemed impaired. The determination as to whether an OTTI exists is based on factual information available at the time of assessment as well as the Company’s estimates of future conditions. As a result, the determination of OTTI and its timing and amount is based on estimates that may change materially over time. The Company’s estimate of the amount and timing of cash flows for its MBS is based on its review of the underlying securities or mortgage loans securing the MBS. The Company considers historical information available and expected future performance of the underlying securities or mortgage loans, including timing of expected future cash flows, prepayment rates, default rates, loss severities, delinquency rates, percentage of non-performing loans, extent of credit support available, Fair Isaac Corporation, or FICO, scores at loan origination, year of origination, loan-to-value ratios, geographic concentrations, as well as reports by credit rating agencies, current and forecast interest rates, general market assessments and dialogue with market participants. As a result, substantial judgment is used in the Company’s analysis to determine the expected cash flows for its MBS. Considerations Applicable to Non-Agency RMBS of High Credit Quality The impairment assessment for Non-Agency RMBS of High Credit Quality involves comparing the present value of the remaining cash flows expected to be collected to the amortized cost of the security at the assessment date. The discount rate used to calculate the present value of the expected future cash flows is based on the security’s effective interest rate as calculated under ASC 310-20 (i.e., the discount rate implicit in the security as of the last measurement date). If the present value of the remaining cash flows expected to be collected is less than the amortized cost basis, an OTTI is recognized in earnings for the difference. This amount is considered to be the credit loss component; the remaining difference between amortized cost and the fair value of the security is considered to be the portion of loss recognized in other comprehensive income. Considerations Applicable to Non-Agency RMBS Not of High Credit Quality Non-Agency RMBS within the scope of ASC 325-40 or ASC 310-30 are considered other-than-temporarily impaired when the following two conditions exist: (1) the fair value is less than the amortized cost basis, and (2) there has been an adverse change in cash flows expected to be collected from the last measurement date (i.e. adverse changes in either the amount or timing of cash flows from those previously expected). The OTTI is separated into a credit loss component that is recognized in earnings and the portion of loss recognized in other comprehensive income. The credit component is comprised of the impact of the fair value decline due to changes in assumptions related to default (collection) risk and prepayments. The portion of loss recognized in other comprehensive income comprises the change in fair value of the security due to all other factors, including changes in benchmark interest rates and market liquidity. In determining the OTTI related to credit losses for securities, the Company compares the present value of the remaining cash flows adjusted for prepayments expected to be collected at the current financial reporting date to the present value of the remaining cash flows expected to be collected at the original purchase date (or the last date those estimates were revised for accounting purposes). The discount rate used to calculate the present value of expected future cash flows is the effective interest rate used for income recognition purposes as determined under ASC 325-40 or ASC 310-30. The determination of whether an OTTI exists and, if so, the extent of the credit component is subject to significant judgment and management’s estimates of both historical information available at the time of assessment, the current market environment, as well as the Company’s estimates of the future performance and projected amount and timing of cash flows expected to be collected on the security. As a result, the timing and amount of OTTI constitutes an accounting estimate that may change materially over time. Investments for which the Company has elected the fair value option are not evaluated for OTTI as all changes in fair value are reflected in earnings. (e) Loans Held for Investment The Company's loans held for investment portfolio is comprised of seasoned residential mortgage loans that are not guaranteed as to repayment of principal or interest. These loans are serviced and may be modified by a third-party servicer. Additionally, in certain cases, the Company has the ability to remove the servicer with or without cause upon prior notice. These residential mortgage loans are designated as held for investment. Interest income on loans held for investment is recognized over the expected life of the loans using the interest method with changes in yield reflected in earnings on a prospective basis and are carried at fair value with changes in fair value recorded in earnings. The Company estimates the fair value of securitized loans as described in Note 5 of these consolidated financial statements. Interest is accrued on all loans held for investment when due. Interest which is not received at the due date is written off when it becomes delinquent. Nonrefundable fees and costs related to acquiring the Company’s residential mortgage loans are recognized as expenses in the Consolidated Statements of Operations. Income recognition is suspended for loans when, based on information from the servicer, a full recovery of interest or principal becomes doubtful. Real estate owned Real estate owned, or REO, represents properties which the Company has received the legal title of the property to satisfy the outstanding loan. REO is re-categorized from loan to REO when the Company takes legal title of the property. REO assets are measured and reported at the estimated fair value less the estimated cost to sell at the end of each reporting period. At the time the asset is re-categorized, any difference between the previously recorded loan balance and the carrying value of the REO at the time the Company takes legal title of the property, is recognized as a gain or loss. All REO assets of the Company are held-for-sale and it is the Company’s intention to sell the property in the shortest time possible to maximize their return and recovery on the previously recorded loan. The carrying value of REO assets at December 31, 2018 and 2017 was $17 million and $10 million , respectively, and were recorded in Other Assets on the Company’s Consolidated Statements of Financial Condition. (f) Repurchase Agreements The Company finances the acquisition of a significant portion of its mortgage-backed securities with repurchase agreements. The Company has evaluated each agreement and has determined that each of the repurchase agreements be accounted for as secured borrowings, which is recourse to the Company. (g) Securitized Debt, collateralized by Non-Agency RMBS and Securitized Debt, collateralized by Loans held for investment Certain re-securitization transactions classified as Securitized Debt, collateralized by Non-Agency RMBS, reflect the transfer to a trust of fixed or adjustable rate MBS which are classified as Non-Agency RMBS that pay interest and principal to the debt holders of that re-securitization. Re-securitization transactions completed by the Company that did not qualify as sales are accounted for as secured borrowings. The associated securitized debt is carried at amortized cost, net of any unamortized premiums or discounts. Certain transactions involving residential mortgage loans are accounted for as secured borrowings, and are recorded as Securitized loans held for investment and the corresponding debt as Securitized debt, collateralized by loans held for investment in the Consolidated Statements of Financial Condition. These securitizations are collateralized by residential adjustable or fixed rate mortgage loans that have been placed in a trust and pay interest and principal to the debt holders of that securitization. The Securitized debt, collateralized by loans held for investment, is carried at fair value. The Company recognizes interest expense on securitized debt over the contractual life of the debt using the interest method with changes in yield reflected in earnings on a retrospective basis. For securitized debt, where the Company has elected fair value option, the interest expense is recognized using the interest method with changes in yield reflected in earnings on a prospective basis. The Company estimates the fair value of its securitized debt as described in Note 5 to these consolidated financial statements. (h) Fair Value Agency MBS: The Company has elected to account for Agency MBS investments acquired on or after July 1, 2017 under the fair value option. Under the fair value option, these investments will be carried at fair value, with changes in fair value reported in earnings (included as part of “Net unrealized gains (losses) on financial instruments at fair value”). Consistent with all other investments for which the Company has elected the fair value option, the Company will recognize revenue on a prospective basis in accordance with guidance in ASC 325-40. All Agency MBS investments owned prior to July 1, 2017 will continue to be carried at fair value with changes in fair value reported in other comprehensive income (OCI) as available-for-sale investments. All revenue recognition for these Agency MBS investments owned prior to July 1, 2017 will be in accordance with ASC 310-20, per the Company’s accounting practices. Non-Agency RMBS - Overcollateralization Class: The Company has elected the fair value option for certain interests in Non-Agency RMBS which it refers to as the overcollateralization classes. The cash flows for these holdings are generally subordinate to all other interests of the trusts and generally only pay out funds when certain ratios are met and excess cash holdings, as determined by the trustee, are available for distribution to the overcollateralization class. Many of the investments in this group have no current cash flows and may not ever pay cash flows, depending on the loss experience of the collateral group supporting the investment. Estimating future cash flows for this group of Non-Agency RMBS investments is highly subjective and uncertain; therefore, the Company records these holdings at fair value with changes in fair value reflected in earnings. Changes in fair value of the overcollateralization classes are presented in Net unrealized gains (losses) on financial instruments at fair value on the Consolidated Statements of Operations. The fair value of the Non-Agency RMBS carried at fair value with changes in fair value reflected in earnings was $12 million and $14 million as of December 31, 2018 and 2017 , respectively. Interest-Only MBS: The Company accounts for the IO MBS strips at fair value with changes in fair value reported in earnings. The IO MBS strips are included in MBS, at fair value, on the accompanying Consolidated Statements of Financial Condition. Included in Non-Agency RMBS, at fair value on the Consolidated Statements of Financial Condition are IO MBS strips carried at fair value with changes in fair value reflected in earnings of $267 million and $219 million as of December 31, 2018 and 2017 . Included in Agency MBS, at fair value on the Consolidated Statements of Financial Condition are IO MBS strips carried at fair value with changes in fair value reflected in earnings of $133 million and $104 million as of December 31, 2018 and 2017 . Interest income reported on all IO MBS securities was $25 million and $31 million for the years ended December 31, 2018 and 2017 , respectively. Loans Held for Investment: The Company’s Loans held for investment are carried at fair value with changes in fair value reflected in earnings. The Company carries Loans held for investment at fair value as it may resecuritize these loans in the future. Additionally, the fair value option allows both the loans and related financing to be consistently reported at fair value and to achieve operational and valuation simplifications. Changes in fair value of Loans held for investment are presented in Net unrealized gains (losses) on financial instruments at fair value on the Consolidated Statements of Operations. Securitized Debt, Collateralized by Loans Held for Investment: The Company’s securitized debt, collateralized by loans held for investment, is carried at fair value with changes in fair value reflected in earnings. The Company has elected the fair value option for these financings as it may call or restructure these debt financings in the future. Additionally, the fair value option allows both the loans and related financing to be consistently reported at fair value and to achieve operational and valuation simplifications. Changes in fair value of securitized debt, collateralized by loans held for investment are presented in Net unrealized gains (losses) on financial instruments at fair value on the Consolidated Statements of Operations. Fair Value Disclosure A complete discussion of the methodology utilized by the Company to estimate the fair value of its financial instruments is included in Note 5 to these consolidated financial statements. (i) Derivative Financial Instruments The Company’s investment policies permit it to enter into derivative contracts, including interest rate swaps, swaptions, mortgage options, futures, and interest rate caps to manage its interest rate risk and, from time to time, enhance investment returns. The Company’s derivatives are recorded as either assets or liabilities in the Consolidated Statements of Financial Condition and measured at fair value. These derivative financial instrument contracts are not designated as hedges for GAAP; therefore, all changes in fair value are recognized in earnings. The Company estimates the fair value of its derivative instruments as described in Note 5 of these consolidated financial statements. Net payments on derivative instruments are included in the Consolidated Statements of Cash Flows as a component of net income. Unrealized gains (losses) on derivatives are removed from net income to arrive at cash flows from operating activities. The Company elects to net the fair value of its derivative contracts by counterparty when appropriate. These contracts contain legally enforceable provisions that allow for netting or setting off of all individual derivative receivables and payables with each counterparty and therefore, the fair value of those derivative contracts are reported net by counterparty. The credit support annex provisions of the Company’s derivative contracts allow the parties to mitigate their credit risk by requiring the party which is in a net payable position to post collateral. As the Company elects to net by counterparty the fair value of derivative contracts, it also nets by counterparty any cash collateral exchanged as part of the derivative. Refer to Note 9 Derivative Instruments for further details. (j) Sales, Securitizations, and Re-Securitizations The Company periodically enters into transactions in which it sells financial assets, such as MBS and mortgage loans. Gains and losses on sales of assets are calculated using the average cost method whereby the Company records a gain or loss on the difference between the average amortized cost of the asset and the proceeds from the sale. In addition, the Company from time to time securitizes or re-securitizes assets and sells tranches in the newly securitized assets. These transactions may be recorded as either sales, whereby the assets contributed to the securitization are removed from the Consolidated Statements of Financial Condition and a gain or loss is recognized, or as secured borrowings whereby the assets contributed to the securitization are not derecognized but rather the debt issued by the securitization entity are recorded to reflect the term financing of the assets. In these securitizations and re-securitizations, the Company may retain senior or subordinated interests in the securitized or re-securitized assets. In transfers that are considered secured borrowings, no gain or loss is recognized. Any difference in the proceeds received and the carrying value of the transferred asset is recorded as a premium or discount and amortized into earnings as an adjustment to yield. (k) Income Taxes The Company has elected to be taxed as a REIT and intends to comply with the provision of the Code, with respect thereto. Accordingly, the Company will generally not be subject to U.S. federal, state or local income taxes to the extent that qualifying distributions are made to stockholders and as long as certain asset, income, distribution and stock ownership tests are met. If the Company failed to qualify as a REIT and did not qualify for certain statutory relief provisions, the Company would be subject to U.S. federal, state and local income taxes and may be precluded from qualifying as a REIT for the subsequent four taxable years following the year in which the REIT qualification was lost. The Company has made joint elections with CIM Funding TRS and Anacostia LLC to treat CIM Funding TRS and Anacostia LLC as TRSs. A TRS is taxable as a domestic C corporation and subject to U.S. federal, state, and local income taxes based upon its taxable income. A tax position is recognized only when, based on management’s judgment regarding the application of income tax laws, it is more likely than not that the tax position will be sustained upon examination. The Company does not have any unrecognized tax positions that would affect its financial statements or require disclosure. No accruals for penalties and interest were necessary as of December 31, 2018 or 2017 . (l) Net Income per Share The Company calculates basic net income per share by dividing net income for the period by the basic weighted-average shares of its common stock outstanding for that period. Diluted net income per share takes into account the effect of dilutive instruments such as unvested restricted stock. (m) Stock-Based Compensation Compensation expense for equity based awards granted to the Company’s independent directors and stock based compensation awards granted to employees of the Company subject only to service condition is recognized on a straight-line basis over the vesting period of such

Mortgage-Backed Securities

Mortgage-Backed Securities	12 Months Ended
	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Mortgage-Backed Securities	Mortgage-Backed Securities The Company classifies its Non-Agency RMBS as senior, senior IO, subordinated, or subordinated IO. The Company also invests in Agency residential, commercial and IO MBS. Senior interests in Non-Agency RMBS are considered to be entitled to the first principal repayments in their pro-rata ownership interests at the acquisition date. The tables below present amortized cost, fair value and unrealized gain/losses of Company's MBS investments as of December 31, 2018 and 2017 . December 31, 2018 (dollars in thousands) Principal or Notional Value Total Premium Total Discount Amortized Cost Fair Value Gross Unrealized Gains Gross Unrealized Losses Net Unrealized Gain/(Loss) Non-Agency RMBS Senior $ 2,386,049 $ 537 $ (1,112,368 ) $ 1,274,218 $ 1,943,124 $ 669,356 $ (450 ) $ 668,906 Senior, interest-only 5,667,198 286,942 — 286,942 254,890 31,123 (63,175 ) (32,052 ) Subordinated 394,037 8,642 (179,669 ) 223,010 276,467 53,702 (245 ) 53,457 Subordinated, interest-only 221,549 9,932 — 9,932 11,649 2,000 (283 ) 1,717 Agency MBS Residential 8,984,249 221,606 — 9,205,855 9,174,382 51,986 (83,459 ) (31,473 ) Commercial 2,895,679 61,727 (4,469 ) 2,952,937 2,881,222 6,303 (78,018 ) (71,715 ) Interest-only 3,028,572 136,026 — 136,026 133,346 1,986 (4,666 ) (2,680 ) Total $ 23,577,333 $ 725,412 $ (1,296,506 ) $ 14,088,920 $ 14,675,080 $ 816,456 $ (230,296 ) $ 586,160 December 31, 2017 (dollars in thousands) Principal or Notional Value Total Premium Total Discount Amortized Cost Fair Value Gross Unrealized Gains Gross Unrealized Losses Net Unrealized Gain/(Loss) Non-Agency RMBS Senior $ 2,733,926 $ 540 $ (1,257,103 ) $ 1,477,363 $ 2,231,415 $ 754,234 $ (182 ) $ 754,052 Senior, interest-only 4,862,461 262,996 — 262,996 210,850 15,761 (67,907 ) (52,146 ) Subordinated 501,455 10,571 (177,206 ) 334,820 401,225 66,704 (299 ) 66,405 Subordinated, interest-only 201,378 7,369 — 7,369 7,826 902 (445 ) 457 Agency MBS Residential 2,227,128 123,245 — 2,350,373 2,322,180 5,706 (33,899 ) (28,193 ) Commercial 1,894,594 47,430 (4,685 ) 1,937,339 1,938,281 17,041 (16,099 ) 942 Interest-only 3,021,840 111,277 — 111,277 104,367 834 (7,744 ) (6,910 ) Total $ 15,442,782 $ 563,428 $ (1,438,994 ) $ 6,481,537 $ 7,216,144 $ 861,182 $ (126,575 ) $ 734,607 The table below presents changes in accretable yield, or the excess of the security’s cash flows expected to be collected over the Company’s investment, solely as it pertains to the Company’s Non-Agency RMBS portfolio accounted for according to the provisions of ASC 310-30. For the Year Ended December 31, 2018 December 31, 2017 (dollars in thousands) Balance at beginning of period $ 1,303,589 $ 1,550,110 Purchases 43,866 20,962 Yield income earned (231,205 ) (266,214 ) Reclassification (to) from non-accretable difference 157,117 18,909 Sales and deconsolidation (25,058 ) (20,178 ) Balance at end of period $ 1,248,309 $ 1,303,589 The table below presents the outstanding principal balance and related amortized cost at December 31, 2018 and 2017 as it pertains to the Company’s Non-Agency RMBS portfolio accounted for according to the provisions of ASC 310-30. For the Year Ended December 31, 2018 December 31, 2017 (dollars in thousands) Outstanding principal balance: Beginning of period $ 2,673,350 $ 3,138,265 End of period $ 2,325,154 $ 2,673,350 Amortized cost: Beginning of period $ 1,381,839 $ 1,695,079 End of period $ 1,158,291 $ 1,381,839 The following tables present the gross unrealized losses and estimated fair value of the Company’s RMBS by length of time that such securities have been in a continuous unrealized loss position at December 31, 2018 and 2017 . All securities in an unrealized loss position have been evaluated by the Company for OTTI as discussed in Note 2(d). December 31, 2018 (dollars in thousands) Unrealized Loss Position for Less than 12 Months Unrealized Loss Position for 12 Months or More Total Estimated Fair Value Unrealized Losses Number of Positions Estimated Fair Value Unrealized Losses Number of Positions Estimated Fair Value Unrealized Losses Number of Positions Non-Agency RMBS Senior $ — $ — — $ 33,303 $ (450 ) 1 $ 33,303 $ (450 ) 1 Senior, interest-only 34,236 (4,276 ) 29 95,108 (58,899 ) 91 129,344 (63,175 ) 120 Subordinated 13,404 (245 ) 7 — — 8 13,404 (245 ) 15 Subordinated, interest-only 2,104 (158 ) 2 303 (125 ) 1 2,407 (283 ) 3 Agency MBS Residential 779,322 (6,220 ) 17 1,809,566 (77,239 ) 114 2,588,888 (83,459 ) 131 Commercial 1,697,555 (56,382 ) 548 504,570 (21,636 ) 183 2,202,125 (78,018 ) 731 Interest-only 5,769 (48 ) 2 41,659 (4,618 ) 17 47,428 (4,666 ) 19 Total $ 2,532,390 $ (67,329 ) 605 $ 2,484,509 $ (162,967 ) 415 $ 5,016,899 $ (230,296 ) 1,020 December 31, 2017 (dollars in thousands) Unrealized Loss Position for Less than 12 Months Unrealized Loss Position for 12 Months or More Total Estimated Fair Value Unrealized Losses Number of Positions Estimated Fair Value Unrealized Losses Number of Positions Estimated Fair Value Unrealized Losses Number of Positions Non-Agency RMBS Senior $ 35,229 $ (182 ) 1 $ — $ — — $ 35,229 $ (182 ) 1 Senior, interest-only 28,129 (1,724 ) 27 120,120 (66,183 ) 120 148,249 (67,907 ) 147 Subordinated 235 (38 ) 7 6,261 (261 ) 5 6,496 (299 ) 12 Subordinated, interest-only — — — 945 (445 ) 3 945 (445 ) 3 Agency MBS Residential 660,103 (5,197 ) 21 1,471,464 (28,702 ) 93 2,131,567 (33,899 ) 114 Commercial 830,889 (11,695 ) 176 161,980 (4,404 ) 91 992,869 (16,099 ) 267 Interest-only 15,142 (641 ) 7 57,875 (7,103 ) 24 73,017 (7,744 ) 31 Total $ 1,569,727 $ (19,477 ) 239 $ 1,818,645 $ (107,098 ) 336 $ 3,388,372 $ (126,575 ) 575 At December 31, 2018 , the Company did not intend to sell any of its RMBS that were in an unrealized loss position, and it was not more likely than not that the Company would be required to sell these RMBS before recovery of their amortized cost basis, which may be at their maturity. With respect to RMBS held by consolidated VIEs, the ability of any entity to cause the sale by the VIE prior to the maturity of these RMBS is either expressly prohibited, not probable, or is limited to specified events of default, none of which have occurred as of December 31, 2018 . Gross unrealized losses on the Company’s Agency residential and commercial MBS (excluding Agency MBS which are reported at fair value with changes in fair value recorded in earnings) were $95 million and $41 million as of December 31, 2018 and 2017 , respectively. Given the inherent credit quality of Agency MBS, the Company does not consider any of the current impairments on its Agency MBS to be credit related. In evaluating whether it is more likely than not that it will be required to sell any impaired security before its anticipated recovery, which may be at their maturity, the Company considers the significance of each investment, the amount of impairment, the projected future performance of such impaired securities, as well as the Company’s current and anticipated leverage capacity and liquidity position. Based on these analyses, the Company determined that at December 31, 2018 and 2017 , unrealized losses on its Agency MBS were temporary. Gross unrealized losses on the Company’s Non-Agency RMBS (excluding Non-Agency MBS which are reported at fair value with changes in fair value recorded in earnings) were $601 thousand and $283 thousand at December 31, 2018 and 2017 , respectively. Based upon the most recent evaluation, the Company does not consider these unrealized losses to be indicative of OTTI and does not believe that these unrealized losses are credit related, but rather are due to other factors. The Company has reviewed its Non-Agency RMBS that are in an unrealized loss position to identify those securities with losses that are other-than-temporary based on an assessment of changes in cash flows expected to be collected for such RMBS, which considers recent bond performance and expected future performance of the underlying collateral. A summary of the OTTI included in earnings for the years ended December 31, 2018 , 2017 and 2016 are presented below. For the Year Ended December 31, 2018 December 31, 2017 December 31, 2016 (dollars in thousands) Total other-than-temporary impairment losses $ (2,556 ) $ (5,169 ) $ (9,589 ) Portion of loss recognized in other comprehensive income (loss) (19,235 ) (56,687 ) (48,398 ) Net other-than-temporary credit impairment losses $ (21,791 ) $ (61,856 ) $ (57,987 ) The following table presents a roll forward of the credit loss component of OTTI on the Company’s Non-Agency RMBS for which a portion of loss was recognized in OCI. The table delineates between those securities that are recognizing OTTI for the first time as opposed to those that have previously recognized OTTI. For the Year Ended December 31, 2018 December 31, 2017 December 31, 2016 (dollars in thousands) Cumulative credit loss beginning balance $ 591,521 $ 556,485 $ 529,112 Additions: Other-than-temporary impairments not previously recognized 9,379 12,669 25,959 Reductions for securities sold or deconsolidated during the period (9,169 ) (12,405 ) (9,429 ) Increases related to other-than-temporary impairments on securities with previously recognized other-than-temporary impairments 12,412 47,211 32,027 Reductions for increases in cash flows expected to be collected over the remaining life of the securities (16,944 ) (12,439 ) (21,184 ) Cumulative credit impairment loss ending balance $ 587,199 $ 591,521 $ 556,485 Cash flows generated to determine net other-than-temporary credit impairment losses recognized in earnings are estimated using significant unobservable inputs. The significant inputs used to measure the component of OTTI recognized in earnings for the Company’s Non-Agency RMBS for the periods reported are summarized as follows: For the Year Ended December 31, 2018 December 31, 2017 Loss Severity Weighted Average 59% 64% Range 5% - 132% 28% - 89% 60+ days delinquent Weighted Average 13% 21% Range 0% - 30% 11% - 27% Credit Enhancement (1) Weighted Average 14% 16% Range 0% - 55% 0% - 50% 3 Month CPR Weighted Average 10% 10% Range 0% - 39% 0% - 24% 12 Month CPR Weighted Average 11% 11% Range 1% - 28% 1% - 19% (1) Calculated as the combined credit enhancement to the Re-REMIC and underlying from each of their respective capital structures. The following tables present a summary of unrealized gains and losses at December 31, 2018 and 2017 . December 31, 2018 (dollars in thousands) Gross Unrealized Gain Included in Accumulated Other Comprehensive Income Gross Unrealized Gain Included in Cumulative Earnings Total Gross Unrealized Gain Gross Unrealized Loss Included in Accumulated Other Comprehensive Income Gross Unrealized Loss Included in Cumulative Earnings Total Gross Unrealized Loss Non-Agency RMBS Senior $ 669,356 $ — $ 669,356 $ (450 ) $ — $ (450 ) Senior, interest-only — 31,123 31,123 — (63,175 ) (63,175 ) Subordinated 50,235 3,467 53,702 (151 ) (94 ) (245 ) Subordinated, interest-only — 2,000 2,000 — (283 ) (283 ) Agency MBS Residential 1,708 50,278 51,986 (59,552 ) (23,907 ) (83,459 ) Commercial 811 5,492 6,303 (35,125 ) (42,893 ) (78,018 ) Interest-only — 1,986 1,986 — (4,666 ) (4,666 ) Total $ 722,110 $ 94,346 $ 816,456 $ (95,278 ) $ (135,018 ) $ (230,296 ) December 31, 2017 (dollars in thousands) Gross Unrealized Gain Included in Accumulated Other Comprehensive Income Gross Unrealized Gain Included in Cumulative Earnings Total Gross Unrealized Gain Gross Unrealized Loss Included in Accumulated Other Comprehensive Income Gross Unrealized Loss Included in Cumulative Earnings Total Gross Unrealized Loss Non-Agency RMBS Senior $ 754,234 $ — $ 754,234 $ (182 ) $ — $ (182 ) Senior, interest-only — 15,761 15,761 — (67,907 ) (67,907 ) Subordinated 62,989 3,715 66,704 (102 ) (197 ) (299 ) Subordinated, interest-only — 902 902 — (445 ) (445 ) Agency MBS Residential 5,706 — 5,706 (29,083 ) (4,816 ) (33,899 ) Commercial 15,462 1,579 17,041 (12,122 ) (3,977 ) (16,099 ) Interest-only — 834 834 — (7,744 ) (7,744 ) Total $ 838,391 $ 22,791 $ 861,182 $ (41,489 ) $ (85,086 ) $ (126,575 ) Changes in prepayments, actual cash flows, and cash flows expected to be collected, among other items, are affected by the collateral characteristics of each asset class. The Company chooses assets for the portfolio after carefully evaluating each investment’s risk profile. The following tables provide a summary of the Company’s MBS portfolio at December 31, 2018 and 2017 . December 31, 2018 Principal or Notional Value Weighted Average Amortized Weighted Average Fair Value Weighted Average Weighted Average Yield at Period-End (1) Non-Agency RMBS Senior $ 2,386,049 $ 53.40 $ 81.44 5.0 % 19.5 % Senior, interest-only 5,667,198 5.06 4.50 1.2 % 8.4 % Subordinated 394,037 56.60 70.16 4.0 % 9.9 % Subordinated, interest-only 221,549 4.48 5.26 1.1 % 16.4 % Agency MBS Residential pass-through 8,984,249 102.47 102.12 4.0 % 3.6 % Commercial pass-through 2,895,679 101.98 99.50 3.6 % 3.4 % Interest-only 3,028,572 4.49 4.40 0.8 % 4.3 % (1) Bond Equivalent Yield at period end. December 31, 2017 Principal or Notional Value at Period-End Weighted Average Amortized Weighted Average Fair Value Weighted Average Weighted Average Yield at Period-End (1) Non-Agency RMBS Senior $ 2,733,926 $ 54.04 $ 81.62 4.6 % 16.7 % Senior, interest-only 4,862,461 5.41 4.34 1.3 % 8.0 % Subordinated 501,455 66.77 80.01 4.1 % 9.6 % Subordinated, interest-only 201,378 3.66 3.89 0.8 % 11.8 % Agency MBS Residential pass-through 2,227,128 105.53 104.27 3.8 % 2.9 % Commercial pass-through 1,894,594 102.26 102.31 3.6 % 3.2 % Interest-only 3,021,840 3.68 3.45 0.7 % 3.4 % (1) Bond Equivalent Yield at period end. The following table presents the weighted average credit rating of the Company’s Non-Agency RMBS portfolio at December 31, 2018 and December 31, 2017 based on fair value. We believe fair value provides an improved representation of the credit rating distribution of the Company's Non-Agency RMBS portfolio. December 31, 2018 December 31, 2017 AAA 0.5 % — % AA 0.1 % — % A 0.3 % — % BBB 0.4 % 0.5 % BB 3.6 % 0.7 % B 1.1 % 0.6 % Below B or not rated 94.0 % 98.2 % Total 100.0 % 100.0 % Actual maturities of MBS are generally shorter than the stated contractual maturities. Actual maturities of the Company’s MBS are affected by the contractual lives of the underlying mortgages, periodic payments of principal and prepayments of principal. The following tables provide a summary of the fair value and amortized cost of the Company’s MBS at December 31, 2018 and December 31, 2017 according to their estimated weighted-average life classifications. The weighted-average lives of the MBS in the tables below are based on lifetime expected prepayment rates using an industry prepayment model for the Agency MBS portfolio and the Company’s prepayment assumptions for the Non-Agency RMBS. The prepayment model considers current yield, forward yield, steepness of the interest rate curve, current mortgage rates, mortgage rates of the outstanding loan, loan age, margin, and volatility. December 31, 2018 (dollars in thousands) Weighted Average Life Less than one year Greater than one year and less than five years Greater than five years and less than ten years Greater than ten years Total Fair value Non-Agency RMBS Senior $ 7,611 $ 357,543 $ 946,536 $ 631,434 $ 1,943,124 Senior interest-only 1,189 38,407 96,401 118,893 254,890 Subordinated — 39,825 43,744 192,898 276,467 Subordinated interest-only — 303 9,321 2,025 11,649 Agency MBS Residential — 640,713 8,524,211 9,458 9,174,382 Commercial — 15,468 28,205 2,837,549 2,881,222 Interest-only 65,675 48,580 19,091 — 133,346 Total fair value $ 74,475 $ 1,140,839 $ 9,667,509 $ 3,792,257 $ 14,675,080 Amortized cost Non-Agency RMBS Senior $ 7,522 $ 277,025 $ 585,187 $ 404,484 $ 1,274,218 Senior interest-only 2,250 46,944 111,538 126,210 286,942 Subordinated — 29,487 26,036 167,487 223,010 Subordinated interest-only — 428 7,358 2,146 9,932 Agency MBS Residential — 645,368 8,550,766 9,721 9,205,855 Commercial — 15,543 29,447 2,907,947 2,952,937 Interest-only 64,185 53,076 18,765 — 136,026 Total amortized cost $ 73,957 $ 1,067,871 $ 9,329,097 $ 3,617,995 $ 14,088,920 December 31, 2017 (dollars in thousands) Weighted Average Life Less than one year Greater than one year and less than five years Greater than five years and less than ten years Greater than ten years Total Fair value Non-Agency RMBS Senior $ 2,179 $ 681,086 $ 910,234 $ 637,916 $ 2,231,415 Senior interest-only 19 54,107 72,702 84,022 210,850 Subordinated — 75,495 121,555 204,175 401,225 Subordinated interest-only — 7,165 661 — 7,826 Agency MBS Residential — 21,777 2,300,403 — 2,322,180 Commercial — 45,770 16,559 1,875,952 1,938,281 Interest-only — 74,490 25,271 4,606 104,367 Total fair value $ 2,198 $ 959,890 $ 3,447,385 $ 2,806,671 $ 7,216,144 Amortized cost Non-Agency RMBS Senior $ 2,124 $ 493,965 $ 569,458 $ 411,816 $ 1,477,363 Senior interest-only 1,271 73,758 94,145 93,822 262,996 Subordinated — 61,987 91,044 181,789 334,820 Subordinated interest-only — 6,355 1,014 — 7,369 Agency MBS Residential — 22,069 2,328,304 — 2,350,373 Commercial — 47,170 17,176 1,872,993 1,937,339 Interest-only — 79,356 27,582 4,339 111,277 Total amortized cost $ 3,395 $ 784,660 $ 3,128,723 $ 2,564,759 $ 6,481,537 The Non-Agency RMBS portfolio is subject to credit risk. The Non-Agency RMBS portfolio is primarily collateralized by Alt-A first lien mortgages. An Alt-A mortgage is a type of U.S. mortgage that, for various reasons, is considered riskier than A-paper, or prime, and less risky than subprime, the riskiest category. Alt-A interest rates, which are determined by credit risk, therefore tend to be between those of prime and subprime home loans. Typically, Alt-A mortgages are characterized by borrowers with less than full documentation, lower credit scores and higher loan-to-value ratios. At origination of the loan, Alt-A mortgage securities are defined as Non-Agency RMBS where (i) the underlying collateral has weighted average FICO scores between 680 and 720 or (ii) the FICO scores are greater than 720 and RMBS have 30% or less of the underlying collateral composed of full documentation loans. At December 31, 2018 and December 31, 2017 , 71% and 66% of the Non-Agency RMBS collateral was classified as Alt-A, respectively. At December 31, 2018 and December 31, 2017 , 12% and 13% of the Non-Agency RMBS collateral was classified as prime, respectively. The remaining Non-Agency RMBS collateral is classified as subprime. The Non-Agency RMBS in the Portfolio have the following collateral characteristics at December 31, 2018 and December 31, 2017 . December 31, 2018 December 31, 2017 Weighted average maturity (years) 21.3 20.7 Weighted average amortized loan to value (1) 62.9 % 64.4 % Weighted average FICO (2) 708 697 Weighted average loan balance (in thousands) $ 308 $ 314 Weighted average percentage owner occupied 85.7 % 84.4 % Weighted average percentage single family residence 63.8 % 66.3 % Weighted average current credit enhancement 1.4 % 2.2 % Weighted average geographic concentration of top four states CA 33.8 % CA 31.7 % FL 7.7 % NY 8.5 % NY 7.4 % FL 8.3 % NJ 2.1 % NJ 2.7 % (1) Value represents appraised value of the collateral at the time of loan origination. (2) FICO as determined at the time of loan origination. The table below presents the origination year of the underlying loans related to the Company’s portfolio of Non-Agency RMBS at December 31, 2018 and December 31, 2017 based on fair value. We believe fair value provides an improved representation of the origination years of the Company's Non-Agency RMBS portfolio. Origination Year December 31, 2018 December 31, 2017 2003 and prior 1.3 % 1.6 % 2004 1.7 % 0.9 % 2005 12.9 % 12.5 % 2006 49.8 % 46.4 % 2007 31.0 % 36.5 % 2008 and later 3.3 % 2.1 % Total 100.0 % 100.0 % Gross realized gains and losses are recorded in “Net realized gains (losses) on sales of investments” on the Company’s Consolidated Statements of Operations. The proceeds and gross realized gains and gross realized losses from sales of investments for the year ended December 31, 2018 , 2017 and 2016 are as follows: For the Year Ended December 31, 2018 December 31, 2017 December 31, 2016 (dollars in thousands) Proceeds from sales $ 116,975 $ 812,005 $ 2,719,329 Gross realized gains 7,547 17,538 28,572 Gross realized losses (10,391 ) (8,415 ) (10,417 ) Net realized gain (loss) $ (2,844 ) $ 9,123 $ 18,155 Included in the net realized gains for the year ended December 31, 2018 in the table above are exchanges of securities with a fair value of $81 million . The Company exchanged its investment in a Re-REMIC security for the underlying collateral supporting the group related to the exchanged asset. These exchanges were treated as non-cash sales and purchases and resulted in a net realized gain of $3 million , reflected in earnings for the year ended December 31, 2018 . For the year ended December 31, 2017 , the fair value of these exchanges of securities was $63 million , and resulted in a realized gain of $9 million .

Loans Held for Investment

Loans Held for Investment	12 Months Ended
	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Loans Held for Investment	Loans Held for Investment The Loans held for investment are comprised primarily of loans collateralized by seasoned subprime residential mortgages. Additionally, it includes non-conforming, single family, owner occupied, jumbo, prime residential mortgages. At December 31, 2018 , all Loans held for investment are carried at fair value. See Note 5 for a discussion on how the Company determines the fair values of the Loans held for investment. As changes in the fair value of these loans are reflected in earnings, the Company does not estimate or record a loan loss provision. The total amortized cost of our Loans held for investment was $12.2 billion and $13.3 billion as of December 31, 2018 and December 31, 2017 , respectively. The following table provides a summary of the changes in the carrying value of Loans held for investment at fair value at December 31, 2018 and December 31, 2017 : For the Year Ended December 31, 2018 December 31, 2017 (dollars in thousands) Balance, beginning of period $ 13,678,263 $ 8,753,653 Purchases 1,671,330 6,539,765 Principal paydowns (1,859,155 ) (1,788,409 ) Sales and settlements (807,364 ) 2,876 Net periodic accretion (amortization) (83,393 ) (35,803 ) Realized gains (losses) on sales and settlements 101 — Change in fair value (27,201 ) 206,181 Balance, end of period $ 12,572,581 $ 13,678,263 The primary cause of the change in fair value is due to market demand and changes in credit risk of mortgage loans. During the year ended December 31, 2018 , the Company purchased $415 million of loans which were subsequently sold to a trust and securitized, with the Company retaining $40 million of beneficial interests. There were no gains or losses incurred from the sale of these assets. Residential mortgage loans The loan portfolio for all residential mortgages were originated during the following years: Origination Year December 31, 2018 December 31, 2017 2002 and prior 7.3 % 7.5 % 2003 6.6 % 6.7 % 2004 13.6 % 14.6 % 2005 19.5 % 20.4 % 2006 22.7 % 23.1 % 2007 19.5 % 19.0 % 2008 6.2 % 6.0 % 2009 1.0 % 0.7 % 2010 and later 3.6 % 2.0 % Total 100.0 % 100.0 % The following table presents a summary of key characteristics of the residential loan portfolio at December 31, 2018 and December 31, 2017 : December 31, 2018 December 31, 2017 Number of loans 140,345 149,172 Weighted average maturity (years) 18.6 18.8 Weighted average loan to value (1) 87.5 % 88.0 % Weighted average FICO (1) 629 631 Weighted average loan balance (in thousands) $ 89 $ 91 Weighted average percentage owner occupied 90.1 % 95.0 % Weighted average percentage single family residence 86.3 % 86.0 % Weighted average geographic concentration of top five states CA 9.0 % CA 9.0 % FL 7.3 % FL 7.2 % OH 5.9 % OH 6.1 % NY 5.7 % PA 5.6 % PA 5.6 % VA 5.5 % (1) As provided by the Trustee. The following tables show various characteristics of our residential loan portfolio and outstanding principal balance of the loans that are 30 days delinquent and greater for the year ended December 31, 2018 and 2017 , respectively. December 31, 2018 (dollars in thousands) Loan Balance Number of Loans Interest Rate Maturity Date Total Principal 30-89 Days Delinquent 90+ Days Delinquent Held-for-Investment at fair value: Adjustable rate loans: $1 to $250 8,258 1.00% to 19.49% 6/1/1983 - 6/1/2058 $ 713,392 $ 80,781 $ 48,235 $250 to $500 456 2.00% to 12.75% 3/1/2023 - 2/1/2057 148,867 17,722 10,779 $500 to $750 65 2.00% to 10.00% 1/1/2034 - 8/1/2047 38,148 2,979 2,762 $750 to $1,000 7 4.13% to 5.13% 4/1/2035 - 4/1/2038 6,008 784 — Over $1,000 7 4.00% to 5.00% 7/1/2037 - 8/1/2039 12,195 — 1,164 8,793 $ 918,610 $ 102,266 $ 62,940 Fixed loans: $1 to $250 126,085 0.00% to 24.00% 6/1/1989 - 5/1/2062 $ 9,566,517 $ 894,574 $ 591,283 $250 to $500 4,942 0.00% to 12.52% 4/1/2018 - 11/1/2061 1,595,673 160,015 128,876 $500 to $750 406 2.00% to 10.69% 7/1/2031 - 5/1/2058 238,292 12,239 10,600 $750 to $1,000 88 2.00% to 7.98% 3/1/2013 - 12/1/2055 75,289 2,677 1,805 Over $1,000 31 3.00% to 6.38% 6/1/2037 - 6/1/2057 38,200 — — 131,552 $ 11,513,971 $ 1,069,505 $ 732,564 Total 140,345 $ 12,432,581 $ 1,171,771 $ 795,504 The foreclosure, bankruptcy, and REO principal balances on our loans were $ 292 million , $ 266 million and $ 47 million , respectively, as of December 31, 2018 , which are included in the table above. December 31, 2017 (dollars in thousands) Loan Balance Number of Loans Interest Rate Maturity Date Total Principal 30-89 Days Delinquent 90+ Days Delinquent Held-for-Investment at fair value: Adjustable rate loans: $1 to $250 9,227 1.00% to 18.74% 9/1/1992 - 6/1/2057 $ 827,020 $ 95,952 $ 46,343 $250 to $500 529 2.00% to 11.88% 11/1/2028 - 12/1/2056 171,266 19,289 11,855 $500 to $750 67 2.00% to 9.25% 1/1/2034 - 9/1/2046 39,212 3,041 2,382 $750 to $1,000 9 3.88% to 5.55% 1/1/2035 - 12/1/2045 7,663 757 — Over $1,000 8 3.88% to 4.00% 7/1/2037 - 8/1/2039 13,702 2,705 1,164 9,840 $ 1,058,863 $ 121,744 $ 61,744 Hybrid loans: $500 to $750 1 6.88% to 6.88% 1/1/2038 - 1/1/2038 $ 702 $ — $ — 1 $ 702 $ — $ — Fixed loans: $1 to $250 133,437 0.00% to 24.00% 9/1/1994 - 5/1/2062 $ 10,371,829 $ 960,564 $ 562,271 $250 to $500 5,324 0.00% to 12.52% 4/1/2018 - 11/1/2065 1,713,839 188,257 114,616 $500 to $750 440 2.00% to 10.69% 7/1/2031 - 9/1/2057 258,058 12,789 13,459 $750 to $1,000 99 2.00% to 7.69% 3/1/2013 - 12/1/2055 84,701 1,706 877 Over $1,000 31 3.00% to 5.75% 12/1/2040 - 7/1/2056 37,828 1,155 — 139,331 $ 12,466,255 $ 1,164,471 $ 691,223 Total 149,172 $ 13,525,820 $ 1,286,215 $ 752,967 The foreclosure, bankruptcy, and REO principal balances on our loans were $ 200 million , $273 million and $31 million , respectively, as of December 31, 2017 , which are included in the table above. The fair value of residential mortgage loans 90 days or more past due was $606 million and $577 million as of December 31, 2018 and December 31, 2017 , respectively.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The Company applies fair value guidance in accordance with GAAP to account for its financial instruments. The Company categorizes its financial instruments, based on the priority of the inputs to the valuation technique, into a three-level fair value hierarchy. The fair value hierarchy gives the highest priority to quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). If the inputs used to measure the financial instruments fall within different levels of the hierarchy, the categorization is based on the lowest level input that is significant to the fair value measurement of the instrument. Financial assets and liabilities recorded at fair value on the Consolidated Statements of Financial Condition or disclosed in the related notes are categorized based on the inputs to the valuation techniques as follows: Level 1 – inputs to the valuation methodology are quoted prices (unadjusted) for identical assets and liabilities in active markets. Level 2 – inputs to the valuation methodology include quoted prices for similar assets and liabilities in active markets, and inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instrument. Level 3 – inputs to the valuation methodology are unobservable and significant to fair value. Fair value measurements categorized within Level 3 are sensitive to changes in the assumptions or methodology used to determine fair value and such changes could result in a significant increase or decrease in the fair value. Any changes to the valuation methodology are reviewed by management to ensure the changes are appropriate. As markets and products evolve and the pricing for certain products becomes more transparent, the Company will continue to refine its valuation methodologies. The methodology utilized by the Company for the periods presented is unchanged. The methods used to produce a fair value calculation may not be indicative of net realizable value or reflective of future fair values. Furthermore, the Company believes its valuation methods are appropriate and consistent with other market participants. Using different methodologies, or assumptions, to determine the fair value of certain financial instruments could result in a different estimate of fair value at the reporting date. The Company uses inputs that are current as of the measurement date, which may include periods of market dislocation, during which price transparency may be reduced. During times of market dislocation, the observability of prices and inputs can be difficult for certain investments. If third party pricing services are unable to provide a price for an asset, or if the price provided by them is deemed unreliable by the Company, then the asset will be valued at its fair value as determined by the Company without validation to third-party pricing. Illiquid investments typically experience greater price volatility as an active market does not exist. Observability of prices and inputs can vary significantly from period to period and may cause instruments to change classifications within the three level hierarchy. A description of the methodologies utilized by the Company to estimate the fair value of its financial instruments by instrument class follows: Agency MBS and Non-Agency RMBS The Company determines the fair value of all of its investment securities based on discounted cash flows utilizing an internal pricing model that incorporates factors such as coupon, prepayment speeds, loan size, collateral composition, borrower characteristics, expected interest rates, life caps, periodic caps, reset dates, collateral seasoning, delinquency, expected losses, expected default severity, credit enhancement, and other pertinent factors. To corroborate that the estimates of fair values generated by these internal models are reflective of current market prices, the Company compares the fair values generated by the model to non-binding independent prices provided by two independent third party pricing services. For certain highly liquid asset classes, such as Agency fixed-rate pass-through bonds, the Company’s valuations are also compared to quoted prices for To-Be-Announced, or TBA, securities. Each quarter the Company develops thresholds which are determined utilizing current bid/ask spreads, liquidity, price volatility and other factors as appropriate. If internally developed model prices differ from the independent prices provided by greater than a market derived predetermined threshold for the period, the Company highlights these differences for further review, both internally and with the third party pricing service. The Company obtains the inputs used by the third party pricing services and compares them to the Company’s inputs. The Company updates its own inputs if the Company determines the third party pricing inputs more accurately reflect the current market environment. If the Company believes that its internally developed inputs more accurately reflect the current market environment, it will request that the third party pricing service review market factors that may not have been considered by the third party pricing service and provide updated prices. The Company reconciles and resolves all pricing differences in excess of the predetermined thresholds before a final price is established. At December 31, 2018 , nineteen investment holdings with an internally developed fair value of $127 million had a difference between the model generated prices and third party prices provided in excess of the derived predetermined threshold for the period. The internally developed prices were $4 million higher than the third party prices provided of $123 million . After review and discussion, the Company affirmed and valued the investments at the higher internally developed prices. No other differences were noted at December 31, 2018 in excess of the derived predetermined threshold for the period. At December 31, 2017 , four investment holdings with an internally developed fair value of $25 million had a difference between the model generated prices and third party prices provided in excess of the derived predetermined threshold for the period. The internally developed prices were $3 million lower than the third party prices provided of $28 million . After review and discussion, the Company affirmed and valued the investments at the lower internally developed prices. The Company’s estimate of prepayment, default and severity curves all involve judgment and assumptions that are deemed to be significant to the fair value measurement process, which renders the resulting Non-Agency RMBS fair value estimates Level 3 inputs in the fair value hierarchy. As the fair values of Agency MBS are more observable, these investments are classified as level 2 in the fair value hierarchy. Loans Held for Investment Loans consisting of seasoned subprime residential mortgage loans: The Company estimates the fair value of its Loans held for investment consisting of seasoned subprime residential mortgage loans on a loan by loan basis using an internally developed model which compares the loan held by the Company with a loan currently offered in the market. The loan price is adjusted in the model by considering the loan factors which would impact the value of a loan. These loan factors include: loan coupon as compared to coupon currently available in the market, FICO, loan-to-value ratios, delinquency history, owner occupancy, and property type, among other factors. A baseline is developed for each significant loan factor and adjusts the price up or down depending on how that factor for each specific loan compares to the baseline rate. Generally, the most significant impact on loan value is the loan interest rate as compared to interest rates currently available in the market and delinquency history. The Company also monitors market activity to identify trades which may be used to compare internally developed prices; however, as the portfolio of loans held at fair value is a seasoned subprime pool of mortgage loans, comparable loan pools are not common or directly comparable. There are limited transactions in the market place to develop a comprehensive direct range of values. The Company reviews the fair values generated by the model to determine whether prices are reflective of the current market by corroborating its estimates of fair value by comparing the results to non-binding independent prices provided by two independent third party pricing services for the loan portfolio. Each quarter the Company develops thresholds which are determined utilizing the securitization market. If the internally developed fair values of the loan pools differ from the independent prices provided by greater than a predetermined threshold for the period, the Company highlights these differences for further review, both internally and with the third party pricing service. The Company obtains certain inputs used by the third party pricing services and evaluates them for reasonableness. The Company updates its own model if the Company determines the third party pricing inputs more accurately reflect the current market environment or observed information from the third party vendors. If the Company believes that its internally developed inputs more accurately reflect the current market environment, it will request that the third party pricing service review market factors that may not have been considered by the third party pricing service. The Company reconciles and resolves all pricing differences in excess of the predetermined thresholds before a final price is established. At December 31, 2018 , the internally developed fair value of three loan pools of $489 million had a difference between the model generated prices and third party prices provided in excess of the derived predetermined threshold for the period. The internally developed prices were $3 million higher than the third party price provided of $486 million . After review and discussion, the Company affirmed and valued the investment at the higher internally developed price. At December 31, 2017 , there were no pricing differences in excess of the predetermined thresholds between the model generated prices and third party prices. The Company’s estimates of fair value of Loans held for investment involve management judgment and assumptions that are deemed to be significant to the fair value measurement process, which renders the resulting fair value estimates level 3 inputs in the fair value hierarchy. Loans collateralized by jumbo, prime residential mortgages : The loans collateralized by jumbo, prime residential mortgages are carried at fair value. The loans are held as part of a consolidated Collateralized Financing Entity, or a CFE. A CFE is a variable interest entity that holds financial assets, issues beneficial interests in those assets and has no more than nominal equity and the beneficial interests have contractual recourse only to the related assets of the CFE. Accounting guidance for CFEs allow the Company to elect to measure the CFE’s financial assets using the fair value of the CFE’s financial liabilities as the fair values of the financial liabilities of the CFE are more observable. Therefore, the fair value of the loans collateralized by jumbo, prime residential mortgages is based on the fair value of the financial liabilities. See discussion of the fair value of Securitized Debt, collateralized by Loans Held for Investment at fair value below. As the more observable financial liabilities are considered level 3 in the fair value hierarchy, the Loans collateralized by jumbo, prime residential mortgages are also level 3 in the fair value hierarchy. Securitized Debt, collateralized by Non-Agency RMBS The Company carries securitized debt, collateralized by Non-Agency RMBS at the principal balance outstanding plus unamortized premiums, less unaccreted discounts recorded in connection with the financing of the loans or RMBS with third parties. For disclosure purposes, the Company estimates the fair value of securitized debt, collateralized by Non-Agency RMBS by estimating the future cash flows associated with the underlying assets collateralizing the secured debt outstanding. The Company models the fair value of each underlying asset by considering, among other items, the structure of the underlying security, coupon, servicer, delinquency, actual and expected defaults, actual and expected default severities, reset indices, and prepayment speeds in conjunction with market research for similar collateral performance and management’s expectations of general economic conditions in the sector and other economic factors. This process, including the review process, is consistent with the process used for Agency MBS and Non-Agency RMBS using internal models. For further discussion of the valuation process and benchmarking process, see Agency MBS and Non-Agency RMBS discussion herein. The Company’s estimates of fair value of securitized debt, collateralized by Non-Agency RMBS involve management’s judgment and assumptions that are deemed to be significant to the fair value measurement process, which renders the resulting fair value estimates level 3 inputs in the fair value hierarchy. Securitized Debt, collateralized by Loans Held for Investment The process for determining the fair value of securitized debt, collateralized by loans held for investment is based on discounted cash flows utilizing an internal pricing model that incorporates factors such as coupon, prepayment speeds, loan size, collateral composition, borrower characteristics, expected interest rates, life caps, periodic caps, reset dates, collateral seasoning, expected losses, expected default severity, credit enhancement, and other pertinent factors. This process, including the review process, is consistent with the process used for Agency MBS and Non-Agency RMBS using internal models. For further discussion of the valuation process and benchmarking process, see Agency MBS and Non-Agency RMBS discussion herein. The Company’s estimates of fair value of securitized debt, collateralized by loans held for investment involve management’s judgment and assumptions that are deemed to be significant to the fair value measurement process, which renders the resulting fair value estimates level 3 inputs in the fair value hierarchy. Fair value option The table below shows the unpaid principal, fair value and impact of change in fair value on each of the financial instruments carried with fair value option as of December 31, 2018 and 2017 , respectively: December 31, 2018 (dollars in thousands) Unpaid Fair Value Year to Date Gain/(Loss) on Change in Fair Value Assets: Non-agency RMBS Subordinated N/A $ 12,014 $ (145 ) Senior, interest-only 5,667,198 254,890 20,095 Subordinated, interest-only 221,549 11,649 1,261 Agency MBS Residential Pass-through 7,573,835 7,739,382 31,185 Commercial Pass-through 1,607,626 1,595,681 (35,002 ) Interest-only 3,028,572 133,346 4,230 Loans held for investment, at fair value 12,432,582 12,572,581 (27,201 ) Liabilities: Securitized debt at fair value, collateralized by loans held for investment 8,561,319 8,455,376 52,209 December 31, 2017 (dollars in thousands) Unpaid Fair Value Year to Date Gain/(Loss) on Change in Fair Value Assets: Non-agency RMBS Subordinated N/A $ 13,993 $ 1,246 Senior, interest-only 4,862,461 210,850 (13,290 ) Subordinated, interest-only 201,378 7,826 2,311 Agency MBS Residential Pass-through 577,522 602,829 (4,816 ) Commercial Pass-through 564,379 570,105 (2,398 ) Interest-only 3,021,840 104,367 465 Loans held for investment, at fair value 13,525,820 13,678,263 206,181 Liabilities: Securitized debt at fair value, collateralized by loans held for investment 9,395,854 9,388,657 (78,289 ) Derivatives Interest Rate Swaps and Swaptions The Company uses clearing exchange market prices to determine the fair value of its exchange cleared interest rate swaps. For bi-lateral swaps, the Company determines the fair value based on the net present value of expected future cash flows on the swap. The Company uses option pricing model to determine the fair value of its swaptions. For bi-lateral swaps and swaptions, the Company compares its own estimate of fair value with counterparty prices to evaluate for reasonableness. Both the clearing exchange and counter-party pricing quotes, incorporate common market pricing methods, including a spread measurement to the Treasury yield curve or interest rate swap curve as well as underlying characteristics of the particular contract. Interest rate swaps and swaptions are modeled by the Company by incorporating such factors as the term to maturity, swap curve, overnight index swap rates, and the payment rates on the fixed portion of the interest rate swaps. The Company has classified the characteristics used to determine the fair value of interest rate swaps and swaptions as Level 2 inputs in the fair value hierarchy. Treasury Futures The fair value of Treasury futures is determined by quoted market prices in an active market. The Company has classified the characteristics used to determine the fair value of Treasury futures as Level 1 inputs in the fair value hierarchy. Repurchase Agreements Repurchase agreements are collateralized financing transactions utilized by the Company to acquire investment securities. Due to the short term nature of these financial instruments, the Company estimates the fair value of these repurchase agreements using the contractual obligation plus accrued interest payable. Short-term Financial Instruments The carrying value of cash and cash equivalents, accrued interest receivable, dividends payable, payable for investments purchased and accrued interest payable are considered to be a reasonable estimate of fair value due to the short term nature and low credit risk of these short-term financial instruments. The Company’s financial assets and liabilities carried at fair value on a recurring basis, including the level in the fair value hierarchy, at December 31, 2018 and December 31, 2017 are presented below. December 31, 2018 (dollars in thousands) Level 1 Level 2 Level 3 Counterparty and Cash Collateral, netting Total Assets: Non-Agency RMBS, at fair value $ — $ — $ 2,486,130 $ — $ 2,486,130 Agency MBS, at fair value — 12,188,950 — — 12,188,950 Loans held for investment, at fair value — — 12,572,581 — 12,572,581 Derivatives — 89,121 — (51,653 ) 37,468 Liabilities: Securitized debt at fair value, collateralized by loans held for investment — — 8,455,376 — 8,455,376 Derivatives 13,375 169,790 — (183,165 ) — December 31, 2017 (dollars in thousands) Level 1 Level 2 Level 3 Counterparty and Cash Collateral, netting Total Assets: Non-Agency RMBS, at fair value $ — $ — 2,851,316 $ — $ 2,851,316 Agency MBS, at fair value — 4,364,828 — — 4,364,828 Loans held for investment, at fair value — — 13,678,263 — 13,678,263 Derivatives 3,553 46,978 — (1,617 ) 48,914 Liabilities: Securitized debt at fair value, collateralized by loans held for investment — — 9,388,657 — 9,388,657 Derivatives — 1,937 — (1,617 ) 320 The table below provides a summary of the changes in the fair value of securities classified as Level 3 at December 31, 2018 and December 31, 2017 . Fair Value Reconciliation, Level 3 For the Year Ended, December 31, 2018 (dollars in thousands) Non-Agency RMBS Loans held for investment Securitized Debt Beginning balance Level 3 $ 2,851,316 $ 13,678,263 $ 9,388,657 Transfers in to Level 3 — — — Transfers out of Level 3 — — — Purchases of assets/ issuance of debt 253,952 1,671,330 1,769,539 Principal payments (521,109 ) (1,859,155 ) (1,778,625 ) Sales and Settlements (100,786 ) (807,364 ) (834,414 ) Net accretion (amortization) 101,088 (83,393 ) (11,197 ) Gains (losses) included in net income Other than temporary credit impairment losses (21,791 ) — — Realized gains (losses) on sales and settlements 201 101 (26,375 ) Net unrealized gains (losses) included in income 21,208 (27,201 ) (52,209 ) Gains (losses) included in other comprehensive income Total unrealized gains (losses) for the period (97,949 ) — — Ending balance Level 3 $ 2,486,130 $ 12,572,581 $ 8,455,376 Fair Value Reconciliation, Level 3 For the Year Ended, December 31, 2017 (dollars in thousands) Non-Agency RMBS Loans held for investment Securitized Debt Beginning balance Level 3 $ 3,330,063 $ 8,753,653 $ 6,941,097 Transfers in to Level 3 6,112 — — Transfers out of Level 3 — — — Purchases of assets/ issuance of debt 78,400 6,539,765 5,173,430 Principal payments (568,339 ) (1,788,409 ) (1,787,368 ) Sales and Settlements (68,162 ) 2,876 (1,056,765 ) Net accretion (amortization) 120,119 (35,803 ) 4,701 Gains (losses) included in net income Other than temporary credit impairment losses (59,881 ) — — Realized gains (losses) on sales and settlements 12,031 — 35,273 Net unrealized gains (losses) included in income (9,733 ) 206,181 78,289 Gains (losses) included in other comprehensive income Total unrealized gains (losses) for the period 10,706 — — Ending balance Level 3 $ 2,851,316 $ 13,678,263 $ 9,388,657 There were no transfers in or out from Level 3, during the year ended December 31, 2018 . There were $6 million of IOs transferred to Level 3 and no transfers out from Level 3 for the year ended December 31, 2017 . The primary cause of the changes in fair value of the loans and the securitized debt are due to market demand for these instruments and changes in credit risk of the portfolio. The significant unobservable inputs used in the fair value measurement of the Company’s Non-Agency RMBS and securitized debt are the weighted average discount rates, constant prepayment speed, or CPR, cumulative default rate, and the loss severity. Constant Prepayment Rates The prepayment speed specifies the percentage of the collateral balance that is expected to prepay at each point in the future. The prepayment speed is based on factors such as collateral FICO score, loan-to-value ratio, debt-to-income ratio, and vintage on a loan level basis and is scaled up or down to reflect recent collateral-specific prepayment experience as obtained from remittance reports and market data services. For securitized debt carried at fair value issued at a premium, as prepayment speeds increase, the amount of interest expense the Company recognizes decreases as the issued premium on the debt amortizes faster than expected. Conversely, decreases in prepayment speeds result in increased expense and can extend the period over which the Company amortizes the premium. For debt issued at a discount, as prepayment speeds increase, the amount of interest the Company expenses increases from the acceleration of the accretion of the discount into interest expense. Conversely, decreases in prepayment speeds result in decreased expense as the accretion of the discount into interest expense occurs over a longer period. Constant Default Rates Constant default rates represent an annualized rate of default on a group of mortgages. The constant default rate, or CDR, represents the percentage of outstanding principal balances in the pool that are in default, which typically equates to the home being past 60-day and 90-day notices and in the foreclosure process. When default rates increase, expected cash flows on the underlying collateral decreases. When default rates decrease, expected cash flows on the underlying collateral increases. Default vectors are determined from the current “pipeline” of loans that are more than 30 days delinquent, in foreclosure, bankruptcy, or are REO. These delinquent loans determine the first 30 months of the default curve. Beyond month 30, the default curve transitions to a value that is reflective of a portion of the current delinquency pipeline. Loss Severity Loss severity rates reflect the amount of loss expected from a foreclosure and liquidation of the underlying collateral in the mortgage loan pool. When a mortgage loan is foreclosed the collateral is sold and the resulting proceeds are used to settle the outstanding obligation. In many circumstances, the proceeds from the sale do not fully repay the outstanding obligation. In these cases, a loss is incurred by the lender. Loss severity is used to predict how costly future losses are likely to be. An increase in loss severity results in a decrease in expected future cash flows. A decrease in loss severity results in an increase in expected future cash flows. The curve generated to reflect the Company’s expected loss severity is based on collateral-specific experience with consideration given to other mitigating collateral characteristics. Characteristics such as seasoning are taken into consideration because severities tend to initially increase on newly originated securities, before beginning to decline as the collateral ages and eventually stabilize. Collateral characteristics such as loan size, loan-to-value, and geographic location of collateral also effect loss severity. Discount Rate The discount rate refers to the interest rate used in the discounted cash flow analysis to determine the present value of future cash flows. The discount rate takes into account not just the time value of money, but also the risk or uncertainty of future cash flows. An increased uncertainty of future cash flows results in a higher discount rate. The discount rate used to calculate the present value of the expected future cash flows is based on the discount rate implicit in the security as of the last measurement date. As discount rates move up, the discounted cash flows are reduced. The discount rates applied to the expected cash flows to determine fair value are derived from a range of observable prices on securities backed by similar collateral. As the market becomes more or less liquid, the availability of these observable inputs will change. Sensitivity of Significant Inputs – Non-Agency RMBS and securitized debt, collateralized by loans held for investment Prepayment speeds, as reflected by the CPR, vary according to interest rates, the type of financial instrument, conditions in financial markets, and other factors, none of which can be predicted with any certainty. In general, when interest rates rise, it is relatively less attractive for borrowers to refinance their mortgage loans, and as a result, prepayment speeds tend to decrease. When interest rates fall, prepayment speeds tend to increase. For RMBS investments purchased at a premium, as prepayment speeds increase, the amount of income the Company earns decreases as the purchase premium on the bonds amortizes faster than expected. Conversely, decreases in prepayment speeds result in increased income and can extend the period over which the Company amortizes the purchase premium. For RMBS investments purchased at a discount, as prepayment speeds increase, the amount of income the Company earns increases from the acceleration of the accretion of the discount into interest income. Conversely, decreases in prepayment speeds result in decreased income as the accretion of the purchase discount into interest income occurs over a longer period. A summary of the significant inputs used to estimate the fair value of Non-Agency RMBS held for investment at fair value as of December 31, 2018 and December 31, 2017 follows: December 31, 2018 December 31, 2017 Significant Inputs Significant Inputs Weighted Average Discount Rate CPR CDR Loss Severity Weighted Average Discount Rate CPR CDR Loss Severity Range Range Non-Agency RMBS Senior 4.5% 1% -25% 0% -60% 35% -95% 4.4% 1% -45% 0% -55% 35% -89% Senior interest-only 11.1% 3% -32% 0% -60% 30% -95% 11.2% 3% -25% 0% -50% 35% -95% Subordinated 5.8% 1% -19% 0% -34% 10% -70% 5.8% 1% -20% 0% -33% 35% -69% Subordinated interest-only 12.0% 4% -25% 0% -24% 35% -68% 12.0% 6% -22% 0% -9% 35% -63% A summary of the significant inputs used to estimate the fair value of securitized debt at fair value, collateralized by loans held for investment, as of December 31, 2018 and December 31, 2017 follows: December 31, 2018 December 31, 2017 Significant Inputs Significant Inputs Weighted Average Discount Rate CPR Range CDR Range Loss Severity Range Weighted Average Discount Rate CPR Range CDR Range Loss Severity Range Securitized debt at fair value, collateralized by loans held for investment 4.3% 6% - 18% 0% - 23% 30% - 65% 4.1% 6% - 15% 0% - 6% 35% - 60% All of the significant inputs listed have some degree of market observability, based on the Company’s knowledge of the market, information available to market participants, and use of common market data sources. Collateral default and loss severity projections are in the form of “curves” that are updated quarterly to reflect the Company’s collateral cash flow projections. Methods used to develop these projections conform to industry conventions. The Company uses assumptions it considers its best estimate of future cash flows for each security. Sensitivity of Significant Inputs – Loans held for investment The Loans held for investment are comprised primarily of loans collateralized by seasoned subprime residential mortgages. Additionally, it includes non-conforming, single family, owner occupied, jumbo, prime residential mortgages. The significant unobservable inputs used to estimate the fair value of the Loans held for investment collateralized by seasoned subprime residential mortgage loans, as of December 31, 2018 and December 31, 2017 include coupon, FICO score at origination, loan-to-value ratios (LTV), owner occupancy status, and property type. A summary of the significant inputs used to estimate the fair value of Loans held for investment collateralized by seasoned subprime mortgages at fair value as of December 31, 2018 and December 31, 2017 follows: December 31, 2018 December 31, 2017 Factor: Coupon Base Rate 5.2% 4.8% Actual 6.9% 6.9% FICO Base Rate 638 636 Actual 626 627 Loan-to-value (LTV) Base Rate 88% 89% Actual 88% 88% Loan Characteristics: Occupancy Owner Occupied 90% 95% Investor 1% 1% Secondary 9% 4% Property Type Single family 86% 87% Manufactured housing 4% 4% Multi-family/mixed use/other 10% 9% The loan factors are generally not observable for the individual loans and the base rates developed by the Company’s internal model are subjective and change as market conditions change. The impact of the loan coupon on the value of the loan is dependent on whether the loan is clean or reperforming. A clean loan, with no history of delinquent payments and a relatively high loan interest rate would result in a higher overall value than a reperforming loan which has a history of delinquency. Similarly, a higher FICO score and a lower LTV ratio results in increases in the fair market value of the loan and a lower FICO score and a higher LTV ratio results in a lower value. Property types also affect the overall loan values. Property types include single family, manufactured housing and multi-family/mixed use and other types of properties. Single family homes represent properties which house one to four family units. Manufactured homes include mobile homes and modular homes. Loan value for properties that are investor or secondary homes have a reduced value as compared to the baseline loan value. Additionally, single family homes will result in an increase to the loan value where manufactured and multi-family/mixed use and other properties will result in a decrease to the loan value, as compared to the baseline. Financial instruments not carried at fair value The following table presents the carrying value and fair value, as described above, of the Company’s financial instruments not carried at fair value on a recurring basis at December 31, 2018 and December 31, 2017 . December 31, 2018 (dollars in thousands) Level in Fair Value Hierarchy Carrying Amount Fair Value Repurchase agreements 2 14,030,465 14,085,164 Securitized debt, collateralized by Non-Agency RMBS 3 159,955 140,711 December 31, 2017 (dollars in thousands) Level in Fair Value Hierarchy Carrying Amount Fair Value Repurchase agreements 2 7,250,452 7,269,193 Securitized debt, collateralized by Non-Agency RMBS 3 205,780 192,259

Repurchase Agreements

Repurchase Agreements	12 Months Ended
	Dec. 31, 2018
Banking and Thrift [Abstract]
Repurchase Agreements	Repurchase Agreements The interest rates of the Company’s repurchase agreements are generally indexed to the one-month and three-month LIBOR rates and re-price accordingly. The repurchase agreements outstanding, weighted average borrowing rates, weighted average remaining maturities, average daily balances and the fair value of collateral pledged as of December 31, 2018 and December 31, 2017 were: December 31, 2018 December 31, 2017 Repurchase agreements outstanding secured by: Agency MBS (in thousands) $ 10,193,272 $ 3,202,056 Non-agency MBS and Loans held for investment (in thousands) 3,837,193 4,048,396 Total: $ 14,030,465 $ 7,250,452 Average balance of Repurchase agreements secured by: Agency MBS (in thousands) $ 6,085,643 $ 3,120,474 Non-agency MBS and Loans held for investment (in thousands) 3,730,527 3,203,700 Total: $ 9,816,170 $ 6,324,174 Average borrowing rate of Repurchase agreements secured by: Agency MBS 2.55 % 1.47 % Non-agency MBS and Loans held for investment 4.04 % 3.41 % Average remaining maturity of Repurchase agreements secured by: Agency MBS 30 Days 28 Days Non-agency MBS and Loans held for investment 231 Days 93 Days Average original maturity of Repurchase agreements secured by: Agency MBS 88 Days 87 Days Non-agency MBS and Loans held for investment 259 Days 123 Days MBS pledged as collateral at fair value on Repurchase agreements: Agency MBS (in thousands) $ 10,832,018 $ 3,450,123 Non-agency MBS and Loans held for investment (in thousands) 4,998,990 5,338,557 Total: $ 15,831,008 $ 8,788,680 At December 31, 2018 and December 31, 2017 , the repurchase agreements collateralized by MBS and Loans held for investment had the following remaining maturities. December 31, 2018 December 31, 2017 (dollars in thousands) Overnight $ — $ — 1 to 29 days 6,326,232 4,745,342 30 to 59 days 4,620,656 1,206,769 60 to 89 days 1,504,695 592,865 90 to 119 days 169,244 — Greater than or equal to 120 days 1,409,638 705,476 Total $ 14,030,465 $ 7,250,452 At December 31, 2018 , there was no amount at risk with any counterparty greater than 10% of the Company's equity. At December 31, 2017 , the Company had an amount at risk with Credit Suisse of 12% of its equity related to the collateral posted on repurchase agreements. As of December 31, 2017 , the weighted average maturity of the repurchase agreements with Credit Suisse was 25 days and the amount at risk was $451 million . There were no other amounts at risk with any other counterparties greater than 10% of the Company’s equity as of December 31, 2017 .

Securitized Debt

Securitized Debt	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Securitized Debt	Securitized Debt All of the Company’s securitized debt is collateralized by residential mortgage loans or Non-Agency RMBS. For financial reporting purposes, the Company’s securitized debt is accounted for as secured borrowings. Thus, the residential mortgage loans or RMBS held as collateral are recorded in the assets of the Company as Loans held for investment or Non-Agency RMBS and the securitized debt is recorded as a non-recourse liability in the accompanying Consolidated Statements of Financial Condition. Securitized Debt Collateralized by Non-Agency RMBS At December 31, 2018 and December 31, 2017 the Company’s securitized debt collateralized by Non-Agency RMBS is carried at amortized cost and had a principal balance of $175 million and $219 million , respectively. At December 31, 2018 and December 31, 2017 , the debt carried a weighted average coupon equal to 6.4% and 6.2% , respectively. As of December 31, 2018 , the maturities of the debt range between the years 2035 and 2037 . None of the Company’s securitized debt collateralized by Non-Agency RMBS is callable. There were no securitized debt collateralized by Non-Agency RMBS acquisitions during the year ended December 31, 2018 . During the year ended December 31, 2017 , the Company acquired securitized debt collateralized by Non-Agency RMBS with an amortized cost balance of $166 thousand for $167 thousand . This transaction resulted in a net loss on the extinguishment of debt of $1 thousand , which is reflected in earnings for the year ended December 31, 2017 . The following table presents the estimated principal repayment schedule of the securitized debt collateralized by Non-Agency RMBS at December 31, 2018 and December 31, 2017 , based on expected cash flows of the residential mortgage loans or RMBS, as adjusted for projected losses on the underlying collateral of the debt. All of the securitized debt recorded in the Company’s Consolidated Statements of Financial Condition is non-recourse to the Company. December 31, 2018 December 31, 2017 (dollars in thousands) Within One Year $ 23,602 $ 42,217 One to Three Years 30,803 45,916 Three to Five Years 8,047 16,524 Greater Than Five Years 3,605 4,867 Total $ 66,057 $ 109,524 Maturities of the Company’s securitized debt collateralized by Non-Agency RMBS are dependent upon cash flows received from the underlying collateral. The estimate of their repayment is based on scheduled principal payments on the underlying collateral. This estimate will differ from actual amounts to the extent prepayments or losses are experienced. See Note 3 for a more detailed discussion of the securities collateralizing the securitized debt. Securitized Debt Collateralized by Loans Held for Investment At December 31, 2018 and December 31, 2017 the Company’s securitized debt collateralized by loans held for investment had a principal balance of $8.6 billion and $9.4 billion , respectively. At December 31, 2018 and December 31, 2017 the total securitized debt collateralized by loans held for investment carried a weighted average coupon equal to 4.5% and 4.2% , respectively. As of December 31, 2018 , the maturities of the debt range between the years 2023 and 2067 . During the year ended December 31, 2018 , the Company acquired securitized debt collateralized by loans with an amortized cost balance of $861 million for $835 million . These transactions resulted in a net gain on the extinguishment of debt of $26 million , which is reflected in earnings for the year ended December 31, 2018 . During the year ended December 31, 2017 , the Company acquired securitized debt collateralized by loans with an amortized cost balance of $1.0 billion for $1.1 billion . This transaction resulted in a net loss on the extinguishment of debt of $35 million . As the Company's securitized debt is carried at fair value with changes in fair value reflected in earnings some of this loss was recognized during prior periods. The following table presents the estimated principal repayment schedule of the securitized debt collateralized by loans held for investment at December 31, 2018 and December 31, 2017 , based on expected cash flows of the residential mortgage loans or RMBS, as adjusted for projected losses on the underlying collateral of the debt. All of the securitized debt recorded in the Company’s Consolidated Statements of Financial Condition is non-recourse to the Company. December 31, 2018 December 31, 2017 (dollars in thousands) Within One Year $ 1,608,381 $ 1,819,018 One to Three Years 2,587,635 2,872,572 Three to Five Years 1,949,060 2,140,434 Greater Than Five Years 2,237,259 2,439,872 Total $ 8,382,335 $ 9,271,896 Maturities of the Company’s securitized debt collateralized by loans held for investment are dependent upon cash flows received from the underlying loans. The estimate of their repayment is based on scheduled principal payments on the underlying loans. This estimate will differ from actual amounts to the extent prepayments or loan losses are experienced. See Note 4 for a more detailed discussion of the loans collateralizing the securitized debt. Certain of the securitized debt collateralized by loans held for investment contain call provisions at the option of the Company. The following table presents the par value of the callable debt by year at December 31, 2018 . December 31, 2018 (dollars in thousands) Year Principal 2019 $ 324,966 2020 4,188,854 2021 3,457,006 2022 274,152 2023 130,811 Total $ 8,375,789

Consolidated Securitization Veh

Consolidated Securitization Vehicles and Other Variable Interest Entities	12 Months Ended
	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Consolidated Securitization Vehicles and Other Variable Interest Entities	Consolidated Securitization Vehicles and Other Variable Interest Entities Since its inception, the Company has utilized VIEs for the purpose of securitizing whole mortgage loans or re-securitizing RMBS and obtaining long-term, non-recourse financing. The Company evaluated its interest in each VIE to determine if it is the primary beneficiary. As of December 31, 2018 , the Company’s Consolidated Statement of Financial Condition includes assets of consolidated VIEs with a carrying value of $13.4 billion and liabilities with a carrying value of $8.7 billion . As of December 31, 2017 , the Company’s Consolidated Statement of Financial Condition includes assets of consolidated VIEs with a carrying value of $15.0 billion and liabilities with a carrying value of $9.6 billion . During the year ended December 31, 2018, the Company securitized and consolidated approximately $2.2 billion unpaid principal balance (of which $1.3 billion related to the collapse and repackaging of certain loan pools previously consolidated as of December 31, 2017) of seasoned residential subprime mortgage loans. VIEs for Which the Company is the Primary Beneficiary The retained beneficial interests in VIEs for which the Company is the primary beneficiary are typically the subordinated tranches of these re-securitizations and in some cases the Company may hold interests in additional tranches. The table below reflects the assets and liabilities recorded in the Consolidated Statements of Financial Condition related to the consolidated VIEs as of December 31, 2018 and December 31, 2017 . December 31, 2018 December 31, 2017 (dollars in thousands) Assets: Non-Agency RMBS, at fair value $ 1,017,442 $ 1,579,793 Loans held for investment, at fair value 12,263,265 13,263,338 Accrued interest receivable 72,389 75,489 Other assets 39,855 68,844 Liabilities: Securitized debt, collateralized by Non-Agency RMBS $ 159,955 $ 205,780 Securitized debt at fair value, collateralized by loans held for investment 8,455,376 9,388,657 Accrued interest payable 33,541 33,870 Other liabilities 3,286 3,513 Income, OTTI and expense amounts related to consolidated VIEs recorded in the Consolidated Statements of Operations is presented in the tables below. For the Year Ended December 31, 2018 December 31, 2017 December 31, 2016 (dollars in thousands) Interest income, Assets of consolidated VIEs $ 904,830 $ 914,022 $ 678,623 Interest expense, Non-recourse liabilities of VIEs 395,255 390,858 249,708 Net interest income $ 509,575 $ 523,164 $ 428,915 Total other-than-temporary impairment losses $ (1,026 ) $ (2,174 ) $ (1,274 ) Portion of loss recognized in other comprehensive income (loss) (17,820 ) (51,118 ) (37,475 ) Net other-than-temporary credit impairment losses $ (18,845 ) $ (53,292 ) $ (38,749 ) Servicing fees $ 39,313 $ 41,493 $ 31,178 VIEs for Which the Company is Not the Primary Beneficiary The Company is not required to consolidate VIEs in which it has concluded it does not have a controlling financial interest, and thus is not the primary beneficiary. In such cases, the Company does not have both the power to direct the entities’ most significant activities and the obligation to absorb losses or right to receive benefits that could potentially be significant to the VIEs. The Company’s investments in these unconsolidated VIEs are carried in Non-Agency RMBS on the Consolidated Statements of Financial Condition and include senior and subordinated bonds issued by the VIEs. The fair value of the Company’s investments in each unconsolidated VIEs at December 31, 2018 , ranged from less than $1 million to $52 million , with an aggregate amount of $1.5 billion . The fair value of the Company’s investments in each unconsolidated VIEs at December 31, 2017 , ranged from less than $1 million to $52 million , with an aggregate amount of $1.3 billion . The Company’s maximum exposure to loss from these unconsolidated VIEs was $1.2 billion at December 31, 2018 and December 31, 2017 . The maximum exposure to loss was determined as the amortized cost of the unconsolidated VIE, which represents the purchase price of the investment adjusted by any unamortized premiums or discounts as of the reporting date.

Derivative Instruments

Derivative Instruments	12 Months Ended
	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	Derivative Instruments In connection with the Company’s interest rate risk management strategy, the Company economically hedges a portion of its interest rate risk by entering into derivative financial instrument contracts in the form of interest rate swaps, swaptions, and Treasury futures. The Company’s swaps are used to lock in a fixed rate related to a portion of its current and anticipated payments on its repurchase agreements. The Company typically agrees to pay a fixed rate of interest, or pay rate, in exchange for the right to receive a floating rate of interest, or receive rate, over a specified period of time. Treasury futures are derivatives which track the prices of specific Treasury securities and are traded on an active exchange. It is generally the Company’s policy to close out any Treasury futures positions prior to taking delivery of the underlying security. The Company uses Treasury futures to lock in a fixed rate related to a portion of its current and anticipated payments on its repurchase agreements. The use of derivatives creates exposure to credit risk relating to potential losses that could be recognized if the counterparties to these instruments fail to perform their obligations under the contracts. In the event of a default by the counterparty, the Company could have difficulty obtaining its RMBS or cash pledged as collateral for these derivative instruments. The Company periodically monitors the credit profiles of its counterparties to determine if it is exposed to counterparty credit risk. See Note 14 for further discussion of counterparty credit risk. The table below summarizes the location and fair value of the derivatives reported in the Consolidated Statements of Financial Condition after counterparty netting and posting of cash collateral as of December 31, 2018 and December 31, 2017 . December 31, 2018 Derivative Assets Derivative Liabilities Derivative Instruments Notional Amount Outstanding Location on Consolidated Statements of Financial Condition Net Estimated Fair Value/Carrying Value Location on Consolidated Statements of Financial Condition Net Estimated Fair Value/Carrying Value (dollars in thousands) Interest Rate Swaps $ 10,906,700 Derivatives, at fair value, net $ 35,798 Derivatives, at fair value, net $ — Swaptions 53,000 Derivatives, at fair value, net 1,670 Derivatives, at fair value, net — Treasury Futures 619,700 Derivatives, at fair value, net — Derivatives, at fair value, net — Total $ 11,579,400 $ 37,468 $ — December 31, 2017 Derivative Assets Derivative Liabilities Derivative Instruments Notional Amount Outstanding Location on Consolidated Statements of Financial Condition Net Estimated Fair Value/Carrying Value Location on Consolidated Statements of Financial Condition Net Estimated Fair Value/Carrying Value (dollars in thousands) Interest Rate Swaps $ 3,816,400 Derivatives, at fair value, net $ 43,257 Derivatives, at fair value, net $ — Swaptions 391,000 Derivatives, at fair value, net 2,105 Derivatives, at fair value, net 320 Treasury Futures 619,700 Derivatives, at fair value, net 3,552 Derivatives, at fair value, net — Total $ 4,827,100 $ 48,914 $ 320 The effect of the Company’s derivatives on the Consolidated Statements of Operations is presented below. Net gains (losses) on derivatives Derivative Instruments Location on Consolidated Statements of December 31, 2018 December 31, 2017 December 31, 2016 (dollars in thousands) Interest Rate Swaps Net unrealized gains (losses) on derivatives $ (125,595 ) $ 43,697 $ 47,170 Interest Rate Swaps Net realized gains (losses) on derivatives (1) (1,488 ) (31,593 ) (88,722 ) Treasury Futures Net unrealized gains (losses) on derivatives (16,928 ) 1,768 378 Treasury Futures Net realized gains (losses) on derivatives 21,333 (4,061 ) (9,170 ) Swaptions Net unrealized gains (losses) on derivatives 1,361 2,511 2,545 Swaptions Net realized gains (losses) on derivatives (1,476 ) (6,134 ) (7,044 ) Other Derivative Assets Net unrealized gains (losses) on derivatives — — — Other Derivative Assets Net realized gains (losses) on derivatives — — (566 ) Total $ (122,793 ) $ 6,188 $ (55,409 ) (1) Includes loss on terminations of interest rate swaps of $16 million and $ 61 million for the years ended December 31, 2017 and 2016 , respectively. There were no swaps terminations during the year ended December 31, 2018 . The weighted average pay rate on the Company’s interest rate swaps at December 31, 2018 was 2.58% and the weighted average receive rate was 2.69% . The weighted average pay rate on the Company’s interest rate swaps at December 31, 2017 was 1.93% and the weighted average receive rate was 1.53% . The weighted average maturity on the Company’s interest rate swaps at December 31, 2018 and December 31, 2017 was 7 and 5 years , respectively. Certain of the Company’s derivative contracts are subject to International Swaps and Derivatives Association Master Agreements or other similar agreements which may contain provisions that grant counterparties certain rights with respect to the applicable agreement upon the occurrence of certain events such as (i) a decline in stockholders’ equity in excess of specified thresholds or dollar amounts over set periods of time, (ii) the Company’s failure to maintain its REIT status, (iii) the Company’s failure to comply with limits on the amount of leverage, and (iv) the Company’s stock being delisted from the New York Stock Exchange (NYSE). Upon the occurrence of any one of items (i) through (iv), or another default under the agreement, the counterparty to the applicable agreement has a right to terminate the agreement in accordance with its provisions. Certain of the Company’s interest rate swaps are cleared through a registered commodities exchange. Each of the Company’s ISDAs and clearing exchange agreements contains provisions under which the Company is required to fully collateralize its obligations under the interest rate swap agreements if at any point the fair value of the swap represents a liability greater than the minimum transfer amount contained within the agreements. The Company is also required to post initial collateral upon execution of certain of its swap transactions. If the Company breaches any of these provisions, it will be required to settle its obligations under the agreements at their termination values, which approximates fair value. The Company uses clearing exchange market prices to determine the fair value of its interest rate swaps. The aggregate fair value of all derivative instruments with credit-risk-related contingent features are in a net liability position at December 31, 2018 is approximately $99 million including accrued interest, which represents the maximum amount the Company would pay upon termination, which is fully collateralized.

Capital Stock

Capital Stock	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Capital Stock	Capital Stock Preferred Stock In September 2018, the Company issued 10,400,000 shares of 7.75% Series C Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock, par value $0.01 per share, or the Series C Preferred Stock, at a public offering price of $25.00 per share and for net proceeds to us of $252 million . The Series C Preferred Stock is redeemable at $25.00 per share plus accrued and unpaid dividends (whether or not authorized or declared) exclusively at the Company’s option commencing in September 30, 2025, subject to the Company’s right, under limited circumstances, to redeem the Series C Preferred Stock prior to that date. The initial dividend rate for the Series C Preferred Stock, from and including September 20, 2018, to but not including September 30, 2025, will be equal to 7.75% per annum of the $25.00 liquidation preference per share (equivalent to the fixed annual rate of $1.9375 per share). On and after September 30, 2025, dividends on the Series C Preferred Stock will accumulate at a percentage of the $25.00 liquidation preference equal to an annual floating rate of the three-month LIBOR plus a spread of 4.743% per annum. The Series C Preferred Stock is entitled to receive, when and as declared, a dividend at a rate of 7.75% per year on the $25.00 liquidation preference before the common stock is paid any dividends and is senior to the common stock with respect to distributions upon liquidation, dissolution or winding up. The Company declared dividends to Series C preferred stock holders of $6 million , or $0.54 per preferred share during the year ended December 31, 2018 . The Company declared dividends to Series A preferred stockholders of $12 million , or $2.00 per preferred share, during the year ended December 31, 2018 and 2017 , respectively. The Company declared dividends to Series B preferred stockholders of $26 million and $22 million , or $2.00 and $1.68 per preferred share during the year ended December 31, 2018 and 2017 , respectively. Common Stock In February 2018, our Board of Directors reauthorized $100 million under our share repurchase program, or the Repurchase Program. Such authorization does not have an expiration date and, at present, there is no intention to modify or otherwise rescind such authorization. Shares of our common stock may be purchased in the open market, including through block purchases, through privately negotiated transactions, or pursuant to any trading plan that may be adopted in accordance with Rule 10b5-1 of the Securities Exchange Act of 1934, as amended. The timing, manner, price and amount of any repurchases will be determined at our discretion and the program may be suspended, terminated or modified at any time for any reason. Among other factors, the Company intends to only consider repurchasing shares of our common stock when the purchase price is less than the last publicly reported book value per common share. In addition, the Company does not intend to repurchase any shares from directors, officers or other affiliates. The program does not obligate the Company to acquire any specific number of shares, and all repurchases will be made in accordance with Rule 10b-18, which sets certain restrictions on the method, timing, price and volume of stock repurchases. Pursuant to our Repurchase Program, the Company repurchased approximately 883 thousand shares of its common stock at an average price of $16.81 per share for a total of $15 million during the year ended December 31, 2018 . The Company did not repurchase any shares during the year ended December 31, 2017 . The Company declared dividends to common shareholders of $375 million and $377 million , or $2.00 per share during the years ended years ended December 31, 2018 , and 2017 , respectively. Earnings per share for the years ended December 31, 2018 , 2017 and 2016 respectively, are computed as follows: For the Year Ended December 31, 2018 December 31, 2017 December 31, 2016 (dollars in thousands) Numerator: Net income available to common shareholders $ 368,440 $ 491,184 $ 549,494 Effect of dilutive securities: — — — Dilutive net income available to common shareholders $ 368,440 $ 491,184 $ 549,494 Denominator: Weighted average basic shares 187,146,170 187,780,355 187,728,634 Effect of dilutive securities 602,692 506,965 296,204 Weighted average dilutive shares 187,748,862 188,287,320 188,024,838 Net income per average share attributable to common stockholders - Basic $ 1.97 $ 2.62 $ 2.93 Net income per average share attributable to common stockholders - Diluted $ 1.96 $ 2.61 $ 2.92

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income The following table presents the changes in the components of Accumulated Other Comprehensive Income, or the AOCI, for the year ended December 31, 2018 and 2017 : December 31, 2018 (dollars in thousands) Unrealized gains (losses) on available-for-sale securities, net Total Accumulated OCI Balance Balance as of December 31, 2017 $ 796,902 $ 796,902 OCI before reclassifications (185,570 ) (185,570 ) Amounts reclassified from AOCI 15,500 15,500 Net current period OCI (170,070 ) (170,070 ) Balance as of December 31, 2018 $ 626,832 $ 626,832 December 31, 2017 (dollars in thousands) Unrealized gains (losses) on available-for-sale securities, net Total Accumulated OCI Balance Balance as of December 31, 2016 $ 718,106 $ 718,106 OCI before reclassifications 24,218 24,218 Amounts reclassified from AOCI 54,578 54,578 Net current period OCI 78,796 78,796 Balance as of December 31, 2017 $ 796,902 $ 796,902 The following table presents the details of the reclassifications from AOCI for the year ended December 31, 2018 and 2017 : December 31, 2018 December 31, 2017 Details about Accumulated OCI Components Amounts Reclassified from Accumulated OCI Amounts Reclassified from Accumulated OCI Affected Line on the Consolidated Statements Of Operations Unrealized gains and losses on available-for-sale securities $ 6,291 $ 7,278 Net realized gains (losses) on sales of investments (21,791 ) (61,856 ) Net other-than-temporary credit impairment losses $ (15,500 ) $ (54,578 ) Income before income taxes — — Income taxes $ (15,500 ) $ (54,578 ) Net of tax

Equity Compensation, Employment

Equity Compensation, Employment Agreements and other Benefit Plans	12 Months Ended
	Dec. 31, 2018
Compensation Related Costs [Abstract]
Equity Compensation, Employment Agreements and other Benefit Plans	Equity Compensation, Employment Agreements and other Benefit Plans In accordance with the terms of the Company’s 2007 Equity Incentive Plan (as amended and restated on December 10, 2015), or the Incentive Plan, directors, officers and employees of the Company are eligible to receive restricted stock grants. These awards generally have a restriction period lasting three years. During the vesting period, these shares may not be sold. There were approximately 5 million shares available for future grants under the Incentive Plan as of December 31, 2018 . During the first quarter of 2017 , the Compensation Committee of the Board of Directors of the Company approved a Stock Award Deferral Program, or the Deferral Program. Under the Deferral Program, non-employee directors and certain executive officers can elect to defer payment of certain stock awards made pursuant to the Equity Plan. Deferred awards are treated as deferred stock units and paid at the earlier of separation from service or a date elected by the participant. Payments are generally made in a lump sum or, if elected by the participant, in five annual installments. Deferred awards receive dividend equivalents during the deferral period in the form of additional deferred stock units. Amounts are paid at the end of the deferral period by delivery of shares from the Incentive Plan (plus cash for any fractional deferred stock units), less any applicable tax withholdings. Deferral elections do not alter any vesting requirements applicable to the underlying stock award. During the year ended December 31, 2018 and 2017 , the Company granted certain of its employees Restricted Stock Units, or RSU awards. RSU awards are designed to reward certain employees of the Company for services provided over the previous year. Generally, the RSU awards vest equally over a three -year period beginning from the grant date and will fully vest after three years . The RSU awards are valued at the market price of the Company’s common stock on the grant date and the employees must be employed by the Company on the vesting dates to receive the RSU awards. The Company granted 335 thousand and 204 thousand RSU awards during the year ended December 31, 2018 and 2017 , with a grant date fair value of $6 million and $4 million , respectively, which will be recognized as compensation expense on a straight-line basis over the three year vesting period. During the year ended December 31, 2018 and 2017 , the Company granted certain employees and directors 133 thousand and 144 thousand Performance Share Units, or PSU awards, respectively. PSU awards are designed to align compensation with the Company’s future performance. The PSU awards include a three year performance period ending on December 31, 2020 and December 31, 2019 , respectively. The final number of shares that will vest will be between 0% to 150% of the total PSU awards granted based on the total shareholder return of the Company as compared to an index of comparable financial institutions and will cliff vest at the end of the performance period. The PSU awards are measured at fair value on the grant date which will be recognized as compensation expense ratably over the three -year vesting period. Fair value is determined using a Monte Carlo valuation model developed to value the specific features of the PSU awards, including market based conditions. Inputs into the model include the Company’s historical volatility, the peer average historical volatility, and the correlation coefficient of the volatility. In addition, inputs also included the share price at the beginning of the measurement period and an estimated total shareholder return for both the Company and the peer group of comparable financial institutions. Based on the model results, the 133 thousand PSU awards granted during 2018 had a grant date value of $2 million that will cliff vest on December 31, 2020. The 144 thousand PSU awards granted during 2017 had a grant date value of $3 million which will cliff vest on December 31, 2019. The following table presents information with respect to the Company's stock awards during the years ended December 31, 2018 and 2017 . For the Year Ended December 31, 2018 December 31, 2017 Number of Shares Weighted Average Grant Date Fair Value Number of Shares Weighted Average Grant Date Fair Value Unvested shares outstanding - beginning of period 769,815 25.58 577,547 14.53 Granted 467,657 17.90 348,244 18.68 Vested (69,303 ) 15.99 (155,976 ) 30.74 Forfeited (8,986 ) 18.40 — — Unvested shares outstanding - end of period 1,159,183 16.51 769,815 25.58 The Company recognized stock based compensation expenses of $8 million and $4 million , for the years ended December 31, 2018 and 2017 , respectively. The Company also maintains a qualified 401(k) plan. The plan is a retirement savings plan that allows eligible employees to contribute a portion of their wages on a tax-deferred basis under Section 401(k) of the Code. Employees may contribute, through payroll deductions, up to $18,500 if under the age of 50 years and an additional $6,000 “catch-up” contribution for employees 50 years or older. The Company matches 100% of the first 6% of the eligible compensation deferred by employee contributions. The employer funds the 401(k) matching contributions in the form of cash, and participants may direct the Company match to an investment of their choice. The benefit of the Company’s contributions vests immediately. Generally, a participating employee is entitled to distributions from the plans upon termination of employment, retirement, death or disability. The 401(k) expenses related to the Company’s qualified plan for the years ended December 31, 2018 and 2017 , were $434 thousand and $376 thousand , respectively.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes For the years ended December 31, 2018 and December 31, 2017 , the Company qualified to be taxed as a REIT under Code Sections 856 through 860. As a REIT, the Company is not subject to U.S. federal income tax to the extent that it makes qualifying distributions of taxable income to its stockholders. To maintain qualification as a REIT, the Company must distribute at least 90% of its annual REIT taxable income (subject to certain adjustments) to its shareholders and meet certain other requirements such as assets it may hold, income it may generate and its shareholder composition. It is generally the Company’s policy to distribute to its shareholders all of the Company’s taxable income. The state and local tax jurisdictions in which the Company is subject to tax-filing obligations recognize the Company’s status as a REIT and therefore the Company generally does not pay income tax in such jurisdictions. The Company may, however, be subject to certain minimum state and local tax filing fees and its TRSs are subject to U.S. federal, state and local taxes. There were no significant income tax expenses for the years ended December 31, 2018 , 2017 and 2016. The Company recorded a deferred tax asset of $7 million and $4 million for the years ended December 31, 2018 and 2017, respectively, relating to the activities of its TRSs. Of these amounts, the amount related to cumulative net operating losses was $550 thousand and $1 million as of December 31, 2018 and 2017, respectively, and the amount related to losses which were disallowed under Code Section 267(a) was $7 million and $3 million as of December 31, 2018 and 2017. The Company evaluates, based on both positive and negative evidence, the likelihood of realizing its deferred tax assets and established a valuation allowance of $7 million and $4 million for the years ended December 31, 2018 and 2017. In general, cash dividends declared by the Company will be considered ordinary income to stockholders for income tax purposes. From time to time, a portion of the Company’s dividends may be characterized as capital gains or return of capital distributions. The Company’s effective tax rate differs from its combined U.S. federal, state and city corporate statutory tax rate primarily due to the deduction of dividend distributions required to be paid under Code Section 857(a). The Company’s 2017, 2016 and 2015 U.S. federal, state and local tax returns remain open for examination.

Credit Risk and Interest Rate R

Credit Risk and Interest Rate Risk	12 Months Ended
	Dec. 31, 2018
Offsetting [Abstract]
Credit Risk and Interest Rate Risk	Credit Risk and Interest Rate Risk The Company’s primary components of market risk are credit risk and interest rate risk. The Company is subject to interest rate risk in connection with its investments in Agency MBS and Non-Agency RMBS, residential mortgage loans, borrowings under repurchase agreements and securitized debt. When the Company assumes interest rate risk, it attempts to minimize interest rate risk through asset selection, hedging and matching the income earned on mortgage assets with the cost of related financing. The Company attempts to minimize credit risk through due diligence, asset selection and portfolio monitoring. The Company has established a whole loan target market including prime and subprime borrowers, Alt-A documentation, geographic diversification, owner-occupied property, and moderate loan-to-value ratios. These factors are considered to be important indicators of credit risk. By using derivative instruments and repurchase agreements, the Company is exposed to counterparty credit risk if counterparties to the contracts do not perform as expected. If a counterparty fails to perform on a derivative hedging instrument, the Company’s counterparty credit risk is equal to the amount reported as a derivative asset on its balance sheet to the extent that amount exceeds collateral obtained from the counterparty or, if in a net liability position, the extent to which collateral posted exceeds the liability to the counterparty. The amounts reported as a derivative asset/(liability) are derivative contracts in a gain/(loss) position, and to the extent subject to master netting arrangements, net of derivatives in a loss/(gain) position with the same counterparty and collateral received/(pledged). If the counterparty fails to perform on a repurchase agreement, the Company is exposed to a loss to the extent that the fair value of collateral pledged exceeds the liability to the counterparty. The Company attempts to minimize counterparty credit risk by evaluating and monitoring the counterparty’s credit, executing master netting arrangements and obtaining collateral, and executing contracts and agreements with multiple counterparties to reduce exposure to a single counterparty. Our repurchase agreements and derivative transactions are governed by underlying agreements that provide for a right of setoff under master netting arrangements, including in the event of default or in the event of bankruptcy of either party to the transactions. The Company presents its assets and liabilities subject to such arrangements on a net basis in our consolidated statements of financial condition. The following table presents information about our liabilities that are subject to such arrangements and can potentially be offset on our consolidated statements of financial condition as of December 31, 2018 and December 31, 2017 . December 31, 2018 (dollars in thousands) Gross Amounts of Recognized Assets (Liabilities) Gross Amounts Offset in the Consolidated Statements of Financial Position Net Amounts Offset in the Consolidated Statements of Financial Position Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position Financial Instruments Cash Collateral (Received) Pledged (1) Net Amount Repurchase Agreements $ (14,030,465 ) $ — $ (14,030,465 ) $ 15,831,008 $ — $ 1,800,543 Interest Rate Swaps - Gross Assets 87,451 (51,653 ) 35,798 — 198,112 233,910 Interest Rate Swaps - Gross Liabilities (169,790 ) 169,790 — — — — Treasury Futures - Gross Assets — — — — 3,220 3,220 Treasury Futures - Gross Liabilities (13,375 ) 13,375 — — — — Swaptions - Gross Assets 1,670 — 1,670 — — 1,670 Swaptions - Gross Liabilities — — — — — — Total Liabilities $ (14,124,509 ) $ 131,512 $ (13,992,997 ) $ 15,831,008 $ 201,332 $ 2,039,343 (1) Included in other assets December 31, 2017 (dollars in thousands) Gross Amounts of Recognized Assets (Liabilities) Gross Amounts Offset in the Consolidated Statements of Financial Position Net Amounts Offset in the Consolidated Statements of Financial Position Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position Financial Instruments Cash Collateral (Received) Pledged (1) Net Amount Repurchase Agreements $ (7,250,452 ) $ — $ (7,250,452 ) $ 8,788,680 $ 1,156 $ 1,539,384 Interest Rate Swaps - Gross Assets 44,874 (1,617 ) 43,257 — 11,570 54,827 Interest Rate Swaps - Gross Liabilities (1,617 ) 1,617 — — — — Treasury Futures - Gross Assets 3,552 — 3,552 — 376 3,928 Treasury Futures - Gross Liabilities — — — — — — Swaptions - Gross Assets 2,105 — 2,105 — — 2,105 Swaptions - Gross Liabilities (320 ) — (320 ) — — (320 ) Total Liabilities $ (7,201,858 ) $ — $ (7,201,858 ) $ 8,788,680 $ 13,102 $ 1,599,924 (1) Included in other assets

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies From time to time, the Company may become involved in various claims and legal actions arising in the ordinary course of business. In connection with certain re-securitization transactions engaged in by the Company, it has the obligation under certain circumstances to repurchase assets from the VIE upon breach of certain representations and warranties. During the third quarter of 2018, Anacostia LLC, a TRS, acquired a 24.9% ownership interest in Kah Capital Management LLC, or KAH Capital, for $25 thousand . KAH Capital was formed to sponsor and manage one or more funds or accounts that focus on investments in U.S. housing related assets including reperforming and distressed loans, structured transactions and securities sourced from Government Sponsored Enterprises (GSEs) and private sellers, as well as other investments related to U.S. mortgage finance. KAH Capital will generate advisory and fee income and accordingly our investment is indirectly held through Anacostia LLC, a taxable REIT subsidiary. In addition to the investment in KAH Capital, the Company has made a $150 million capital commitment to Hains Point (Hains Point), which is KAH Capital’s initial fund for which Chimera is the sole investor. As of December 31, 2018 , the Company has funded $2 million towards that commitment. KAH Capital will manage the investments in Hains Point including asset selection, repurchase and other financing arrangements as well as hedging transactions. Capital calls for investments made in Hains Point are subject to our consent and approval. KAH Capital will earn $6.5 million over approximately 3 years for its investment advisory services. KAH Capital is a registered investment advisor with the Securities and Exchange Commission (SEC). We do not believe we are a “control person” of KAH Capital given the structure of our investment. If we were deemed a control person by a court, the SEC or other regulatory body, under certain circumstances we could have liability for misconduct by KAH Capital.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Subsequent to December 31, 2018 , the Company sold 8,000,000 shares of 8.00% Series D Cumulative Redeemable Preferred Stock, par value $0.01 per share, or the Series D Preferred Stock, at a public offering price of $25.00 per share. The Series D Preferred Stock is redeemable at $25.00 per share plus accrued and unpaid dividends (whether or not authorized or declared) exclusively at the Company’s option commencing in March 30, 2024, subject to the Company’s right, under limited circumstances, to redeem the Series D Preferred Stock prior to that date. The Series D Preferred Stock is entitled to receive a dividend at a rate of 8.00% per year on the $25.00 liquidation preference before the common stock is paid any dividends and is senior to the common stock with respect to distributions upon liquidation, dissolution or winding up. This transaction was completed in January 2019, pursuant to which the company received net proceeds of $194 million .

Summarized Quarterly Results (U

Summarized Quarterly Results (Unaudited)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Summarized Quarterly Results (Unaudited)	Summarized Quarterly Results (Unaudited) The following is a presentation of the results of operations for the quarters ended December 31, 2018, September 30, 2018, June 30, 2018 and March 31, 2018. For the Quarter Ended December 31, 2018 September 30, 2018 June 30, 2018 March 31, 2018 (dollars in thousands, except per share data) Net Interest Income: Interest income $ 348,033 $ 321,715 $ 306,436 $ 297,132 Interest expense 193,920 174,671 161,266 149,251 Net interest income 154,113 147,044 145,170 147,881 Net other-than-temporary credit impairment losses (4,269 ) (7,233 ) (9,131 ) (1,158 ) Net gains (losses) on derivatives (315,877 ) 74,078 24,502 94,504 Net unrealized gains (losses) on financial instruments at fair value 84,836 (34,306 ) (18,364 ) 14,466 Net realized gains (losses) on sales of investments 1,213 (6,123 ) 2,167 — Gain (loss) on Extinguishment of Debt 7,055 9,263 387 9,670 Total other expenses 29,855 25,395 26,587 26,322 Net income (loss) $ (102,798 ) $ 157,321 $ 118,108 $ 239,007 Dividend on preferred stock $ 14,437 $ 9,960 $ 9,400 $ 9,400 Net income (loss) available to common shareholders $ (117,235 ) $ 147,361 $ 108,708 $ 229,607 Net income per common share-basic $ (0.63 ) $ 0.79 $ 0.58 $ 1.22 The following is a presentation of the results of operations for the quarters ended December 31, 2017, September 30, 2017, June 30, 2017 and March 31, 2017. For the Quarter Ended December 31, 2017 September 30, 2017 June 30, 2017 March 31, 2017 (dollars in thousands, except per share data) Net Interest Income: Interest income $ 301,957 $ 296,813 $ 288,644 $ 251,344 Interest expense 144,204 140,358 137,955 110,231 Net interest income 157,753 156,455 150,689 141,113 Net other-than-temporary credit impairment losses (18,179 ) (11,468 ) (13,509 ) (18,701 ) Net gains (losses) on derivatives 31,108 1,363 (21,822 ) (4,462 ) Net unrealized gains (losses) on financial instruments at fair value (47,637 ) 19,042 67,762 72,243 Net realized gains (losses) on sales of investments (586 ) 1 4,541 5,167 Gain (loss) on Extinguishment of Debt 12,742 (1 ) (48,014 ) — Total other expenses 27,657 26,142 24,491 32,537 Net income (loss) $ 107,608 $ 139,232 $ 115,017 $ 162,807 Dividend on preferred stock $ 9,400 $ 9,400 $ 9,400 $ 5,283 Net income (loss) available to common shareholders $ 98,208 $ 129,832 $ 105,617 $ 157,524 Net income per common share-basic $ 0.52 $ 0.69 $ 0.56 $ 0.84

Summary of the Significant Ac_2

Summary of the Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Basis of Presentation and Consolidation	Basis of Presentation and Consolidation The accompanying consolidated financial statements and related notes of the Company have been prepared in accordance with accounting principles generally accepted in the United States, or GAAP. In the opinion of management, all adjustments considered necessary for a fair presentation of the Company's financial position, results of operations and cash flows have been included. Certain prior period amounts have been reclassified to conform to the current period's presentation. The consolidated financial statements include, the Company’s accounts, the accounts of its wholly-owned subsidiaries, and variable interest entities, or VIEs, in which the Company is the primary beneficiary. All intercompany balances and transactions have been eliminated in consolidation. The Company uses securitization trusts considered to be VIEs in its securitization and re-securitization transactions. VIEs are defined as entities in which equity investors (i) do not have the characteristics of a controlling financial interest, or (ii) do not have sufficient equity at risk for the entity to finance its activities without additional subordinated financial support from other parties. The entity that consolidates a VIE is known as its primary beneficiary, and is generally the entity with (i) the power to direct the activities that most significantly impact the VIEs’ economic performance, and (ii) the right to receive benefits from the VIE or the obligation to absorb losses of the VIE that could be significant to the VIE. For VIEs that do not have substantial on-going activities, the power to direct the activities that most significantly impact the VIEs’ economic performance may be determined by an entity’s involvement with the design and structure of the VIE. The trusts are structured as entities that receive principal and interest on the underlying collateral and distribute those payments to the security holders. The assets held by the securitization entities are restricted in that they can only be used to fulfill the obligations of the securitization entity. The Company’s risks associated with its involvement with these VIEs are limited to its risks and rights as a holder of the security it has retained. Determining the primary beneficiary of a VIE requires judgment. The Company determined that for the securitizations it consolidates, its ownership provides the Company with the obligation to absorb losses or the right to receive benefits from the VIE that could be significant to the VIE. In addition, the Company has the power to direct the activities of the VIEs that most significantly impact the VIEs’ economic performance, or power, such as rights to direct servicer activity or the Company was determined to have power in connection with its involvement with the structure and design of the VIE. The Company’s interest in the assets held by these securitization vehicles, which are consolidated on the Company’s Consolidated Statements of Financial Condition, is restricted by the structural provisions of these trusts, and a recovery of the Company’s investment in the vehicles will be limited by each entity’s distribution provisions. The liabilities of the securitization vehicles, which are also consolidated on the Company’s Consolidated Statements of Financial Condition, are non-recourse to the Company, and can only be satisfied from each securitization vehicle’s respective asset pool. The assets of securitization entities are comprised of residential mortgage backed securities (or RMBS), or residential mortgage loans. Statements of Financial Condition Presentation The Company’s Consolidated Statements of Financial Condition include both the Company’s direct assets and liabilities and the assets and liabilities of consolidated securitization vehicles. Assets of each consolidated VIE can only be used to satisfy the obligations of that VIE, and the liabilities of consolidated VIEs are non-recourse to the Company. The Company is not obligated to provide, nor does it intend to provide, any financial support to these consolidated securitization vehicles. The notes to the consolidated financial statements describe the Company’s assets and liabilities including the assets and liabilities of consolidated securitization vehicles.
Cash and Cash Equivalents	Cash and Cash Equivalents Cash and cash equivalents include cash on hand and cash deposited overnight in money market funds, which are not bank deposits and are not insured or guaranteed by the Federal Deposit Insurance Corporation.
Agency and Non-Agency Mortgage-Backed Securities	Agency and Non-Agency Mortgage-Backed Securities The Company invests in mortgage backed securities, or MBS, representing interests in obligations backed by pools of mortgage loans. The Company delineates between Agency MBS and Non-Agency MBS as follows: (1) Agency MBS are mortgage pass-through certificates, collateralized mortgage obligations, or CMOs, and other MBS representing interests in or obligations backed by pools of mortgage loans issued or guaranteed by agencies of the U.S. Government, such as Ginnie Mae, or federally chartered corporations such as Freddie Mac or Fannie Mae where principal and interest repayments are guaranteed by the respective agency of the U.S. Government or federally chartered corporation; and (2) Non-Agency MBS are not issued or guaranteed by a U.S. Government Agency or other institution and are subject to credit risk. Repayment of principal and interest on Non-Agency MBS is not guaranteed and it is subject to the performance of the mortgage loans or MBS collateralizing the obligation. The Company also invests in Interest Only Agency MBS strips and Interest Only Non-Agency RMBS strips, or IO MBS strips. IO MBS strips represent the Company’s right to receive a specified proportion of the contractual interest flows of the collateral. Interest income on IO MBS strips is accrued based on the outstanding notional balance and the security’s contractual terms, and amortization of any premium is calculated in accordance with the Financial Accounting Standards Board, or FASB, Accounting Standards Codification, or ASC, 325-40, Beneficial Interests in Securitized Financial Assets, or ASC 325-40. The Company accounts for IO MBS strips at fair value with changes in fair value recognized in the Company’s Consolidated Statements of Operations. The Company classifies its MBS as available-for-sale and records investments at estimated fair value as described in Note 5 of these consolidated financial statements. The Company includes unrealized gains and losses considered to be temporary on certain MBS in Other comprehensive income, or OCI, in the Consolidated Statements of Operations. For IO MBS strips and certain other MBS investments, the Company carries these investments at fair value with changes in fair value included in earnings in the Consolidated Statements of Operations. From time to time, as part of the overall management of its portfolio, the Company may sell any of its investments and recognize a realized gain or loss as a component of earnings in the Consolidated Statements of Operations utilizing the average cost method. The Company’s accounting policy for interest income and impairment related to its MBS is as follows: Interest Income Recognition The recognition of interest income on MBS securities varies depending on the characteristics of the security as follows: Agency MBS and Non-Agency RMBS of High Credit Quality FASB ASC 310-20, Nonrefundable Fees and Other Costs, or ASC 310-20, is applied to the recognition of interest income for the following securities: • Certain Agency MBS • Non-Agency RMBS that meet all of the following conditions at the acquisition date (referred to hereafter as “Non-Agency RMBS of High Credit Quality”): 1. Rated AA or higher by a nationally recognized credit rating agency using the lowest rating available; 2. The Company expects to collect all of the security's contractual cash flows; and 3. The security cannot be contractually prepaid such that the Company would not recover substantially all of its recorded investment. Under ASC 310-20, interest income, including premiums and discounts associated with the acquisition of these securities, is recognized over the life of such securities using the interest method based on the contractual cash flows of the security. In applying the interest method, the Company considers estimates of future principal prepayments in the calculation of the effective yield. Differences that arise between previously anticipated prepayments and actual prepayments received, as well as changes in future prepayment assumptions, result in a recalculation of the effective yield on the security. This recalculation of the effective yield is updated on a quarterly basis. Upon a recalculation of the effective yield, the investment in the security is adjusted to the amount that would have existed had the new effective yield been retrospectively applied since acquisition with a corresponding charge or credit to interest income. The Agency MBS, for which we have elected fair value option, we apply FASB ASC 325-40. For these securities accounted for under ASC 325-40, any positive or adverse change in cash flows results in a prospective increase or decrease in the effective interest rate used to recognize interest income. Non-Agency RMBS Not of High Credit Quality Non-Agency RMBS purchased at a discount and not of high credit quality at the time of purchase are accounted for under ASC 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality, or ASC 310-30, or ASC 325-40 (referred to hereafter as “Non-Agency RMBS Not of High Credit Quality”). Non-Agency RMBS are accounted for under ASC 310-30 if the following conditions are met as of the acquisition date: 1. There is evidence of deterioration in credit quality of the security from its inception; and 2. It is probable that the Company will be unable to collect all contractual cash flows of the security. Non-Agency RMBS that are not within the scope of ASC 310-30 are accounted for under ASC 325-40 if at the acquisition date: 1. The security is not of high credit quality (defined as rated below AA or is unrated), or 2. The security can contractually be prepaid or otherwise settled in such a way that the Company would not recover substantially all of its recorded investment. Interest income on Non-Agency RMBS Not of High Credit Quality is recognized using the interest method based on management’s estimates of cash flows expected to be collected. The effective interest rate on these securities is based on management’s estimate for each security of the projected cash flows, which are estimated based on observation of current market information and include assumptions related to fluctuations in prepayment speeds and the timing and amount of credit losses. On a quarterly basis, the Company reviews and, if appropriate, makes adjustments to its cash flow projections based on inputs and analyses received from external sources, internal models, and the Company’s judgments about prepayment rates, the timing and amount of credit losses, and other factors. Changes in the amount or timing of cash flows from those originally projected, or from those estimated at the last evaluation date, are considered to be either positive changes or adverse changes. For securities accounted for under ASC 325-40, any positive or adverse change in cash flows that does not result in the recognition of an other-than-temporary impairment, or OTTI, results in a prospective increase or decrease in the effective interest rate used to recognize interest income. For securities accounted for under ASC 310-30, only significant positive changes are reflected prospectively in the effective interest rate used to recognize interest income. Under ASC 310-30, adverse changes in cash flows expected to be collected for Non-Agency RMBS, in an unrealized loss position, generally result in recognition of an OTTI with no change in the effective interest rate used to recognize interest income. Impairment Considerations Applicable to certain MBS When the fair value of an available-for-sale MBS is less than its amortized cost, the security is considered impaired. On a quarterly basis, the Company evaluates its securities for OTTI. If the Company intends to sell an impaired security, or it is more-likely-than-not that the Company will be required to sell an impaired security before its anticipated recovery, then the Company must recognize an OTTI through a charge to earnings equal to the entire difference between the investment’s amortized cost and its fair value at the measurement date. If the Company does not intend to sell an impaired security and it is not more-likely-than-not that it would be required to sell an impaired security before recovery, the Company must further evaluate the security for impairment due to credit losses. The credit component of OTTI is recognized in earnings and the remaining component is recorded as a component of OCI. Following the recognition of an OTTI through earnings, a new amortized cost basis is established for the security and subsequent recovery in fair value may not be adjusted through current earnings. Subsequent recoveries are amortized into income over the remaining life of the security as an adjustment to yield. When evaluating whether the Company intends to sell an impaired security or will more-likely-than-not be required to sell an impaired security before recovery, the Company makes judgments that consider among other things, its liquidity, leverage, contractual obligations, and targeted investment strategy to determine its intent and ability to hold the investments that are deemed impaired. The determination as to whether an OTTI exists is based on factual information available at the time of assessment as well as the Company’s estimates of future conditions. As a result, the determination of OTTI and its timing and amount is based on estimates that may change materially over time. The Company’s estimate of the amount and timing of cash flows for its MBS is based on its review of the underlying securities or mortgage loans securing the MBS. The Company considers historical information available and expected future performance of the underlying securities or mortgage loans, including timing of expected future cash flows, prepayment rates, default rates, loss severities, delinquency rates, percentage of non-performing loans, extent of credit support available, Fair Isaac Corporation, or FICO, scores at loan origination, year of origination, loan-to-value ratios, geographic concentrations, as well as reports by credit rating agencies, current and forecast interest rates, general market assessments and dialogue with market participants. As a result, substantial judgment is used in the Company’s analysis to determine the expected cash flows for its MBS. Considerations Applicable to Non-Agency RMBS of High Credit Quality The impairment assessment for Non-Agency RMBS of High Credit Quality involves comparing the present value of the remaining cash flows expected to be collected to the amortized cost of the security at the assessment date. The discount rate used to calculate the present value of the expected future cash flows is based on the security’s effective interest rate as calculated under ASC 310-20 (i.e., the discount rate implicit in the security as of the last measurement date). If the present value of the remaining cash flows expected to be collected is less than the amortized cost basis, an OTTI is recognized in earnings for the difference. This amount is considered to be the credit loss component; the remaining difference between amortized cost and the fair value of the security is considered to be the portion of loss recognized in other comprehensive income. Considerations Applicable to Non-Agency RMBS Not of High Credit Quality Non-Agency RMBS within the scope of ASC 325-40 or ASC 310-30 are considered other-than-temporarily impaired when the following two conditions exist: (1) the fair value is less than the amortized cost basis, and (2) there has been an adverse change in cash flows expected to be collected from the last measurement date (i.e. adverse changes in either the amount or timing of cash flows from those previously expected). The OTTI is separated into a credit loss component that is recognized in earnings and the portion of loss recognized in other comprehensive income. The credit component is comprised of the impact of the fair value decline due to changes in assumptions related to default (collection) risk and prepayments. The portion of loss recognized in other comprehensive income comprises the change in fair value of the security due to all other factors, including changes in benchmark interest rates and market liquidity. In determining the OTTI related to credit losses for securities, the Company compares the present value of the remaining cash flows adjusted for prepayments expected to be collected at the current financial reporting date to the present value of the remaining cash flows expected to be collected at the original purchase date (or the last date those estimates were revised for accounting purposes). The discount rate used to calculate the present value of expected future cash flows is the effective interest rate used for income recognition purposes as determined under ASC 325-40 or ASC 310-30. The determination of whether an OTTI exists and, if so, the extent of the credit component is subject to significant judgment and management’s estimates of both historical information available at the time of assessment, the current market environment, as well as the Company’s estimates of the future performance and projected amount and timing of cash flows expected to be collected on the security. As a result, the timing and amount of OTTI constitutes an accounting estimate that may change materially over time. Investments for which the Company has elected the fair value option are not evaluated for OTTI as all changes in fair value are reflected in earnings.
Loans Held for Investment	Loans Held for Investment The Company's loans held for investment portfolio is comprised of seasoned residential mortgage loans that are not guaranteed as to repayment of principal or interest. These loans are serviced and may be modified by a third-party servicer. Additionally, in certain cases, the Company has the ability to remove the servicer with or without cause upon prior notice. These residential mortgage loans are designated as held for investment. Interest income on loans held for investment is recognized over the expected life of the loans using the interest method with changes in yield reflected in earnings on a prospective basis and are carried at fair value with changes in fair value recorded in earnings. The Company estimates the fair value of securitized loans as described in Note 5 of these consolidated financial statements. Interest is accrued on all loans held for investment when due. Interest which is not received at the due date is written off when it becomes delinquent. Nonrefundable fees and costs related to acquiring the Company’s residential mortgage loans are recognized as expenses in the Consolidated Statements of Operations. Income recognition is suspended for loans when, based on information from the servicer, a full recovery of interest or principal becomes doubtful. Real estate owned Real estate owned, or REO, represents properties which the Company has received the legal title of the property to satisfy the outstanding loan. REO is re-categorized from loan to REO when the Company takes legal title of the property. REO assets are measured and reported at the estimated fair value less the estimated cost to sell at the end of each reporting period. At the time the asset is re-categorized, any difference between the previously recorded loan balance and the carrying value of the REO at the time the Company takes legal title of the property, is recognized as a gain or loss. All REO assets of the Company are held-for-sale and it is the Company’s intention to sell the property in the shortest time possible to maximize their return and recovery on the previously recorded loan.
Repurchase Agreements	Repurchase Agreements The Company finances the acquisition of a significant portion of its mortgage-backed securities with repurchase agreements. The Company has evaluated each agreement and has determined that each of the repurchase agreements be accounted for as secured borrowings, which is recourse to the Company.
Securitized Debt, collateralized by Non-Agency RMBS and Securitized Debt, collateralized by Loans held for investment	Securitized Debt, collateralized by Non-Agency RMBS and Securitized Debt, collateralized by Loans held for investment Certain re-securitization transactions classified as Securitized Debt, collateralized by Non-Agency RMBS, reflect the transfer to a trust of fixed or adjustable rate MBS which are classified as Non-Agency RMBS that pay interest and principal to the debt holders of that re-securitization. Re-securitization transactions completed by the Company that did not qualify as sales are accounted for as secured borrowings. The associated securitized debt is carried at amortized cost, net of any unamortized premiums or discounts. Certain transactions involving residential mortgage loans are accounted for as secured borrowings, and are recorded as Securitized loans held for investment and the corresponding debt as Securitized debt, collateralized by loans held for investment in the Consolidated Statements of Financial Condition. These securitizations are collateralized by residential adjustable or fixed rate mortgage loans that have been placed in a trust and pay interest and principal to the debt holders of that securitization. The Securitized debt, collateralized by loans held for investment, is carried at fair value. The Company recognizes interest expense on securitized debt over the contractual life of the debt using the interest method with changes in yield reflected in earnings on a retrospective basis. For securitized debt, where the Company has elected fair value option, the interest expense is recognized using the interest method with changes in yield reflected in earnings on a prospective basis. The Company estimates the fair value of its securitized debt as described in Note 5 to these consolidated financial statements.
Fair Value	Interest-Only MBS: The Company accounts for the IO MBS strips at fair value with changes in fair value reported in earnings. The IO MBS strips are included in MBS, at fair value, on the accompanying Consolidated Statements of Financial Condition. Loans Held for Investment: The Company’s Loans held for investment are carried at fair value with changes in fair value reflected in earnings. The Company carries Loans held for investment at fair value as it may resecuritize these loans in the future. Additionally, the fair value option allows both the loans and related financing to be consistently reported at fair value and to achieve operational and valuation simplifications. Changes in fair value of Loans held for investment are presented in Net unrealized gains (losses) on financial instruments at fair value on the Consolidated Statements of Operations. Securitized Debt, Collateralized by Loans Held for Investment: The Company’s securitized debt, collateralized by loans held for investment, is carried at fair value with changes in fair value reflected in earnings. The Company has elected the fair value option for these financings as it may call or restructure these debt financings in the future. Additionally, the fair value option allows both the loans and related financing to be consistently reported at fair value and to achieve operational and valuation simplifications. Changes in fair value of securitized debt, collateralized by loans held for investment are presented in Net unrealized gains (losses) on financial instruments at fair value on the Consolidated Statements of Operations. Fair Value Disclosure A complete discussion of the methodology utilized by the Company to estimate the fair value of its financial instruments is included in Note 5 to these consolidated financial statements. Fair Value Agency MBS: The Company has elected to account for Agency MBS investments acquired on or after July 1, 2017 under the fair value option. Under the fair value option, these investments will be carried at fair value, with changes in fair value reported in earnings (included as part of “Net unrealized gains (losses) on financial instruments at fair value”). Consistent with all other investments for which the Company has elected the fair value option, the Company will recognize revenue on a prospective basis in accordance with guidance in ASC 325-40. All Agency MBS investments owned prior to July 1, 2017 will continue to be carried at fair value with changes in fair value reported in other comprehensive income (OCI) as available-for-sale investments. All revenue recognition for these Agency MBS investments owned prior to July 1, 2017 will be in accordance with ASC 310-20, per the Company’s accounting practices. Non-Agency RMBS - Overcollateralization Class: The Company has elected the fair value option for certain interests in Non-Agency RMBS which it refers to as the overcollateralization classes. The cash flows for these holdings are generally subordinate to all other interests of the trusts and generally only pay out funds when certain ratios are met and excess cash holdings, as determined by the trustee, are available for distribution to the overcollateralization class. Many of the investments in this group have no current cash flows and may not ever pay cash flows, depending on the loss experience of the collateral group supporting the investment. Estimating future cash flows for this group of Non-Agency RMBS investments is highly subjective and uncertain; therefore, the Company records these holdings at fair value with changes in fair value reflected in earnings. Changes in fair value of the overcollateralization classes are presented in Net unrealized gains (losses) on financial instruments at fair value on the Consolidated Statements of Operations.
Derivative Financial Instrument	Derivative Financial Instruments The Company’s investment policies permit it to enter into derivative contracts, including interest rate swaps, swaptions, mortgage options, futures, and interest rate caps to manage its interest rate risk and, from time to time, enhance investment returns. The Company’s derivatives are recorded as either assets or liabilities in the Consolidated Statements of Financial Condition and measured at fair value. These derivative financial instrument contracts are not designated as hedges for GAAP; therefore, all changes in fair value are recognized in earnings. The Company estimates the fair value of its derivative instruments as described in Note 5 of these consolidated financial statements. Net payments on derivative instruments are included in the Consolidated Statements of Cash Flows as a component of net income. Unrealized gains (losses) on derivatives are removed from net income to arrive at cash flows from operating activities. The Company elects to net the fair value of its derivative contracts by counterparty when appropriate. These contracts contain legally enforceable provisions that allow for netting or setting off of all individual derivative receivables and payables with each counterparty and therefore, the fair value of those derivative contracts are reported net by counterparty. The credit support annex provisions of the Company’s derivative contracts allow the parties to mitigate their credit risk by requiring the party which is in a net payable position to post collateral. As the Company elects to net by counterparty the fair value of derivative contracts, it also nets by counterparty any cash collateral exchanged as part of the derivative.
Sales, Securitizations, and Re-Securitizations	Sales, Securitizations, and Re-Securitizations The Company periodically enters into transactions in which it sells financial assets, such as MBS and mortgage loans. Gains and losses on sales of assets are calculated using the average cost method whereby the Company records a gain or loss on the difference between the average amortized cost of the asset and the proceeds from the sale. In addition, the Company from time to time securitizes or re-securitizes assets and sells tranches in the newly securitized assets. These transactions may be recorded as either sales, whereby the assets contributed to the securitization are removed from the Consolidated Statements of Financial Condition and a gain or loss is recognized, or as secured borrowings whereby the assets contributed to the securitization are not derecognized but rather the debt issued by the securitization entity are recorded to reflect the term financing of the assets. In these securitizations and re-securitizations, the Company may retain senior or subordinated interests in the securitized or re-securitized assets. In transfers that are considered secured borrowings, no gain or loss is recognized. Any difference in the proceeds received and the carrying value of the transferred asset is recorded as a premium or discount and amortized into earnings as an adjustment to yield.
Income Taxes	Income Taxes The Company has elected to be taxed as a REIT and intends to comply with the provision of the Code, with respect thereto. Accordingly, the Company will generally not be subject to U.S. federal, state or local income taxes to the extent that qualifying distributions are made to stockholders and as long as certain asset, income, distribution and stock ownership tests are met. If the Company failed to qualify as a REIT and did not qualify for certain statutory relief provisions, the Company would be subject to U.S. federal, state and local income taxes and may be precluded from qualifying as a REIT for the subsequent four taxable years following the year in which the REIT qualification was lost. The Company has made joint elections with CIM Funding TRS and Anacostia LLC to treat CIM Funding TRS and Anacostia LLC as TRSs. A TRS is taxable as a domestic C corporation and subject to U.S. federal, state, and local income taxes based upon its taxable income. A tax position is recognized only when, based on management’s judgment regarding the application of income tax laws, it is more likely than not that the tax position will be sustained upon examination. The Company does not have any unrecognized tax positions that would affect its financial statements or require disclosure.
Net Income per Share	Net Income per Share The Company calculates basic net income per share by dividing net income for the period by the basic weighted-average shares of its common stock outstanding for that period. Diluted net income per share takes into account the effect of dilutive instruments such as unvested restricted stock.
Share-based Compensation	Stock-Based Compensation Compensation expense for equity based awards granted to the Company’s independent directors and stock based compensation awards granted to employees of the Company subject only to service condition is recognized on a straight-line basis over the vesting period of such awards, based upon the fair value of such awards at the grant date. The Company recognizes forfeitures when they occur and does not adjust the fair value of the grants for estimated forfeitures. For awards subject to vesting on a straight line basis, the total amount of expense is at least equal to the measured expense of each vested tranche. Awards subject to only a service condition are valued according to the market price for the Company’s common stock at the date of grant. For awards based on the performance of the Company, it generally engages an independent appraisal company to determine the value of the shares at the date of grant, taking into account the underlying contingency risks associated with the performance criteria. The values of these grants are expensed ratably over their respective vesting periods (irrespective of achievement of the performance criteria) adjusted, as applicable, for forfeitures.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Although the Company’s estimates contemplate current conditions and how it expects them to change in the future, it is reasonably possible that actual conditions could be materially different than anticipated in those estimates, which could have a material adverse impact on the Company’s results of operations and its financial condition. Management has made significant estimates including in accounting for income recognition and OTTI on Agency and Non-Agency RMBS and IO MBS (Note 3), valuation of Agency MBS and Non-Agency RMBS (Notes 3 and 5), residential mortgage loans (Note 4 and 5), securitized debt (Note 5 and 7) and derivative instruments (Notes 5 and 9). Actual results could differ materially from those estimates.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Derivatives and Hedging (Topic 815): Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting Purposes (ASU No. 2018-16) In October 2018, the FASB issued ASU No. 2018-16, Derivatives and Hedging - Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting Purposes. The amendments in this update permit the OIS rate based on SOFR as a U.S. benchmark interest rate. Including the OIS rate based on SOFR as an eligible benchmark interest rate during the early stages of the marketplace transition will facilitate the LIBOR to SOFR transition and provide sufficient lead time for entities to prepare for changes to interest rate risk hedging strategies for both risk management and hedge accounting purposes. For entities that have not already adopted update 2017-12, the amendments in this update are required to be adopted concurrently with the amendments in update 2017-12, which is effective for the Company as of January 1, 2019. The amendments should be adopted on a prospective basis for qualifying new or redesignated hedging relationships entered into on or after the date of adoption. The Company has not early adopted the ASU 2017-12, therefore, this ASU is effective for the Company as of January 1, 2019. The Company currently does not have any derivative instruments linked to SOFR and the Company currently does not apply hedge accounting for GAAP reporting purposes. The adoption of this guidance is not expected to have any material impact on the Company's consolidated financial statements. Targeted improvements to Accounting for Hedging Activities (ASU No. 2017-12) In August 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging - Targeted improvements to Accounting for Hedging Activities. This update is issued with the objective of improving the financial reporting of hedging relationships to better portray the economic results of an entity’s risk management activities in its financial statements. In addition, the amendments in this update make certain targeted improvements to simplify the application of the hedge accounting guidance in current GAAP. The guidance in the ASU is effective for the Company as of January 1, 2019. The Company currently does not apply hedge accounting for GAAP reporting purposes, therefore, the adoption of this guidance is not expected to have any material impact on the Company's consolidated financial statements. Fair Value Measurement - Changes to the Disclosure Requirements for Fair Value Measurement (Topic 820) In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement - Changes to the Disclosure Requirements for Fair Value Measurement. The amendments in this update modify the disclosure requirements on fair value measurements in Topic 820, Fair Value Measurement. It eliminates disclosure requirements for transfers between Level 1 and Level 2 of the fair value hierarchy and policies related to valuation processes and the timing of transfers between levels of the fair value hierarchy. It adds the following disclosure requirements, but it exempts nonpublic entities from these requirements: i) The changes in unrealized gains and losses for the period included in other comprehensive income for recurring Level 3 fair value measurements of instruments held at the end of the reporting period and ii) For recurring and nonrecurring Level 3 fair value measurements, the range and weighted averages used to develop significant unobservable inputs and how the weighted average was calculated, with certain exceptions. The guidance in the ASU is effective for the Company as of January 1, 2019. The adoption of this guidance is not expected to have any impact on the Company's consolidated financial statements except disclosure changes suggested by the guidance. Income Statement - Reporting Comprehensive Income - (Topic 220) In February 2018, the FASB issued ASU No. 2018-02, Income Statement - Reporting Comprehensive Income - Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. The amendments in this update allow a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act. Consequently, the amendments eliminate the stranded tax effects resulting from the Tax Cuts and Jobs Act and will improve the usefulness of information reported to financial statement users. However, because the amendments only relate to the reclassification of the income tax effects of the Tax Cuts and Jobs Act, the underlying guidance that requires that the effect of a change in tax laws or rates be included in income from continuing operations is not affected. The amendments in this Update also require certain disclosures about stranded tax effects. The guidance in the ASU is effective for the Company as of January 1, 2019. As of December 31, 2018, the Company does not have any material stranded tax effects from the Tax Cuts and Jobs Act. The adoption of this guidance is not expected to have any material impact on the Company's consolidated financial statements. Financial Instruments - Credit Losses - (Topic 326) In June 2016, the FASB issued ASU No. 2016-13, Measurement of Credit Losses on Financial Instruments . This update replaces the current model for recognizing credit losses from an incurred credit loss model to a current expected credit loss (CECL) model for instruments measured at amortized cost and requires entities to record allowances for available-for-sale (AFS) debt securities for all expected (rather than incurred) credit losses of the asset rather than reduce the carrying amount, as the Company does under the current OTTI model. This update also simplifies the accounting model for purchased credit-impaired debt securities and loans. The changes in the allowances created in accordance with this update will be recorded in earnings. The update also expands the disclosure requirements regarding the Company's assumptions, models, and methods for estimating the expected credit losses. In addition, the Company will disclose the amortized cost balance for each class of financial asset by credit quality indicator, disaggregated by the year of origination. The guidance in the ASU is effective for the Company as of January 1, 2020. Early adoption is allowed, beginning January 1, 2019. The standard requires entities to record a cumulative-effect adjustment to the statement of financial position as of the beginning of the first reporting period in which the guidance is effective. The Company is not planning to early adopt and is currently evaluating what impact this update will have on the consolidated financial statements.

Mortgage-Backed Securities (Tab

Mortgage-Backed Securities (Tables)	12 Months Ended
	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Schedule of present amortized cost, fair value and unrealized gain/losses of Company's MBS investments	The tables below present amortized cost, fair value and unrealized gain/losses of Company's MBS investments as of December 31, 2018 and 2017 . December 31, 2018 (dollars in thousands) Principal or Notional Value Total Premium Total Discount Amortized Cost Fair Value Gross Unrealized Gains Gross Unrealized Losses Net Unrealized Gain/(Loss) Non-Agency RMBS Senior $ 2,386,049 $ 537 $ (1,112,368 ) $ 1,274,218 $ 1,943,124 $ 669,356 $ (450 ) $ 668,906 Senior, interest-only 5,667,198 286,942 — 286,942 254,890 31,123 (63,175 ) (32,052 ) Subordinated 394,037 8,642 (179,669 ) 223,010 276,467 53,702 (245 ) 53,457 Subordinated, interest-only 221,549 9,932 — 9,932 11,649 2,000 (283 ) 1,717 Agency MBS Residential 8,984,249 221,606 — 9,205,855 9,174,382 51,986 (83,459 ) (31,473 ) Commercial 2,895,679 61,727 (4,469 ) 2,952,937 2,881,222 6,303 (78,018 ) (71,715 ) Interest-only 3,028,572 136,026 — 136,026 133,346 1,986 (4,666 ) (2,680 ) Total $ 23,577,333 $ 725,412 $ (1,296,506 ) $ 14,088,920 $ 14,675,080 $ 816,456 $ (230,296 ) $ 586,160 December 31, 2017 (dollars in thousands) Principal or Notional Value Total Premium Total Discount Amortized Cost Fair Value Gross Unrealized Gains Gross Unrealized Losses Net Unrealized Gain/(Loss) Non-Agency RMBS Senior $ 2,733,926 $ 540 $ (1,257,103 ) $ 1,477,363 $ 2,231,415 $ 754,234 $ (182 ) $ 754,052 Senior, interest-only 4,862,461 262,996 — 262,996 210,850 15,761 (67,907 ) (52,146 ) Subordinated 501,455 10,571 (177,206 ) 334,820 401,225 66,704 (299 ) 66,405 Subordinated, interest-only 201,378 7,369 — 7,369 7,826 902 (445 ) 457 Agency MBS Residential 2,227,128 123,245 — 2,350,373 2,322,180 5,706 (33,899 ) (28,193 ) Commercial 1,894,594 47,430 (4,685 ) 1,937,339 1,938,281 17,041 (16,099 ) 942 Interest-only 3,021,840 111,277 — 111,277 104,367 834 (7,744 ) (6,910 ) Total $ 15,442,782 $ 563,428 $ (1,438,994 ) $ 6,481,537 $ 7,216,144 $ 861,182 $ (126,575 ) $ 734,607
Schedule of changes in accretable yield	The table below presents changes in accretable yield, or the excess of the security’s cash flows expected to be collected over the Company’s investment, solely as it pertains to the Company’s Non-Agency RMBS portfolio accounted for according to the provisions of ASC 310-30. For the Year Ended December 31, 2018 December 31, 2017 (dollars in thousands) Balance at beginning of period $ 1,303,589 $ 1,550,110 Purchases 43,866 20,962 Yield income earned (231,205 ) (266,214 ) Reclassification (to) from non-accretable difference 157,117 18,909 Sales and deconsolidation (25,058 ) (20,178 ) Balance at end of period $ 1,248,309 $ 1,303,589
Schedule of non-agency RMBS having deteriorated credit when acquired	The table below presents the outstanding principal balance and related amortized cost at December 31, 2018 and 2017 as it pertains to the Company’s Non-Agency RMBS portfolio accounted for according to the provisions of ASC 310-30. For the Year Ended December 31, 2018 December 31, 2017 (dollars in thousands) Outstanding principal balance: Beginning of period $ 2,673,350 $ 3,138,265 End of period $ 2,325,154 $ 2,673,350 Amortized cost: Beginning of period $ 1,381,839 $ 1,695,079 End of period $ 1,158,291 $ 1,381,839
Schedule of temporary impairment losses, investments	The following tables present the gross unrealized losses and estimated fair value of the Company’s RMBS by length of time that such securities have been in a continuous unrealized loss position at December 31, 2018 and 2017 . All securities in an unrealized loss position have been evaluated by the Company for OTTI as discussed in Note 2(d). December 31, 2018 (dollars in thousands) Unrealized Loss Position for Less than 12 Months Unrealized Loss Position for 12 Months or More Total Estimated Fair Value Unrealized Losses Number of Positions Estimated Fair Value Unrealized Losses Number of Positions Estimated Fair Value Unrealized Losses Number of Positions Non-Agency RMBS Senior $ — $ — — $ 33,303 $ (450 ) 1 $ 33,303 $ (450 ) 1 Senior, interest-only 34,236 (4,276 ) 29 95,108 (58,899 ) 91 129,344 (63,175 ) 120 Subordinated 13,404 (245 ) 7 — — 8 13,404 (245 ) 15 Subordinated, interest-only 2,104 (158 ) 2 303 (125 ) 1 2,407 (283 ) 3 Agency MBS Residential 779,322 (6,220 ) 17 1,809,566 (77,239 ) 114 2,588,888 (83,459 ) 131 Commercial 1,697,555 (56,382 ) 548 504,570 (21,636 ) 183 2,202,125 (78,018 ) 731 Interest-only 5,769 (48 ) 2 41,659 (4,618 ) 17 47,428 (4,666 ) 19 Total $ 2,532,390 $ (67,329 ) 605 $ 2,484,509 $ (162,967 ) 415 $ 5,016,899 $ (230,296 ) 1,020 December 31, 2017 (dollars in thousands) Unrealized Loss Position for Less than 12 Months Unrealized Loss Position for 12 Months or More Total Estimated Fair Value Unrealized Losses Number of Positions Estimated Fair Value Unrealized Losses Number of Positions Estimated Fair Value Unrealized Losses Number of Positions Non-Agency RMBS Senior $ 35,229 $ (182 ) 1 $ — $ — — $ 35,229 $ (182 ) 1 Senior, interest-only 28,129 (1,724 ) 27 120,120 (66,183 ) 120 148,249 (67,907 ) 147 Subordinated 235 (38 ) 7 6,261 (261 ) 5 6,496 (299 ) 12 Subordinated, interest-only — — — 945 (445 ) 3 945 (445 ) 3 Agency MBS Residential 660,103 (5,197 ) 21 1,471,464 (28,702 ) 93 2,131,567 (33,899 ) 114 Commercial 830,889 (11,695 ) 176 161,980 (4,404 ) 91 992,869 (16,099 ) 267 Interest-only 15,142 (641 ) 7 57,875 (7,103 ) 24 73,017 (7,744 ) 31 Total $ 1,569,727 $ (19,477 ) 239 $ 1,818,645 $ (107,098 ) 336 $ 3,388,372 $ (126,575 ) 575
Other than temporary impairment, credit losses recognized in earnings	A summary of the OTTI included in earnings for the years ended December 31, 2018 , 2017 and 2016 are presented below. For the Year Ended December 31, 2018 December 31, 2017 December 31, 2016 (dollars in thousands) Total other-than-temporary impairment losses $ (2,556 ) $ (5,169 ) $ (9,589 ) Portion of loss recognized in other comprehensive income (loss) (19,235 ) (56,687 ) (48,398 ) Net other-than-temporary credit impairment losses $ (21,791 ) $ (61,856 ) $ (57,987 ) The following table presents a roll forward of the credit loss component of OTTI on the Company’s Non-Agency RMBS for which a portion of loss was recognized in OCI. The table delineates between those securities that are recognizing OTTI for the first time as opposed to those that have previously recognized OTTI. For the Year Ended December 31, 2018 December 31, 2017 December 31, 2016 (dollars in thousands) Cumulative credit loss beginning balance $ 591,521 $ 556,485 $ 529,112 Additions: Other-than-temporary impairments not previously recognized 9,379 12,669 25,959 Reductions for securities sold or deconsolidated during the period (9,169 ) (12,405 ) (9,429 ) Increases related to other-than-temporary impairments on securities with previously recognized other-than-temporary impairments 12,412 47,211 32,027 Reductions for increases in cash flows expected to be collected over the remaining life of the securities (16,944 ) (12,439 ) (21,184 ) Cumulative credit impairment loss ending balance $ 587,199 $ 591,521 $ 556,485
Other than temporary impairment of investments recorded in earnings, significant inputs and assumptions	The significant inputs used to measure the component of OTTI recognized in earnings for the Company’s Non-Agency RMBS for the periods reported are summarized as follows: For the Year Ended December 31, 2018 December 31, 2017 Loss Severity Weighted Average 59% 64% Range 5% - 132% 28% - 89% 60+ days delinquent Weighted Average 13% 21% Range 0% - 30% 11% - 27% Credit Enhancement (1) Weighted Average 14% 16% Range 0% - 55% 0% - 50% 3 Month CPR Weighted Average 10% 10% Range 0% - 39% 0% - 24% 12 Month CPR Weighted Average 11% 11% Range 1% - 28% 1% - 19% (1) Calculated as the combined credit enhancement to the Re-REMIC and underlying from each of their respective capital structures.
Summary of unrealized gains and losses on MBS	The following tables present a summary of unrealized gains and losses at December 31, 2018 and 2017 . December 31, 2018 (dollars in thousands) Gross Unrealized Gain Included in Accumulated Other Comprehensive Income Gross Unrealized Gain Included in Cumulative Earnings Total Gross Unrealized Gain Gross Unrealized Loss Included in Accumulated Other Comprehensive Income Gross Unrealized Loss Included in Cumulative Earnings Total Gross Unrealized Loss Non-Agency RMBS Senior $ 669,356 $ — $ 669,356 $ (450 ) $ — $ (450 ) Senior, interest-only — 31,123 31,123 — (63,175 ) (63,175 ) Subordinated 50,235 3,467 53,702 (151 ) (94 ) (245 ) Subordinated, interest-only — 2,000 2,000 — (283 ) (283 ) Agency MBS Residential 1,708 50,278 51,986 (59,552 ) (23,907 ) (83,459 ) Commercial 811 5,492 6,303 (35,125 ) (42,893 ) (78,018 ) Interest-only — 1,986 1,986 — (4,666 ) (4,666 ) Total $ 722,110 $ 94,346 $ 816,456 $ (95,278 ) $ (135,018 ) $ (230,296 ) December 31, 2017 (dollars in thousands) Gross Unrealized Gain Included in Accumulated Other Comprehensive Income Gross Unrealized Gain Included in Cumulative Earnings Total Gross Unrealized Gain Gross Unrealized Loss Included in Accumulated Other Comprehensive Income Gross Unrealized Loss Included in Cumulative Earnings Total Gross Unrealized Loss Non-Agency RMBS Senior $ 754,234 $ — $ 754,234 $ (182 ) $ — $ (182 ) Senior, interest-only — 15,761 15,761 — (67,907 ) (67,907 ) Subordinated 62,989 3,715 66,704 (102 ) (197 ) (299 ) Subordinated, interest-only — 902 902 — (445 ) (445 ) Agency MBS Residential 5,706 — 5,706 (29,083 ) (4,816 ) (33,899 ) Commercial 15,462 1,579 17,041 (12,122 ) (3,977 ) (16,099 ) Interest-only — 834 834 — (7,744 ) (7,744 ) Total $ 838,391 $ 22,791 $ 861,182 $ (41,489 ) $ (85,086 ) $ (126,575 )
Residential mortgage backed securities collateral characteristics	The following tables provide a summary of the Company’s MBS portfolio at December 31, 2018 and 2017 . December 31, 2018 Principal or Notional Value Weighted Average Amortized Weighted Average Fair Value Weighted Average Weighted Average Yield at Period-End (1) Non-Agency RMBS Senior $ 2,386,049 $ 53.40 $ 81.44 5.0 % 19.5 % Senior, interest-only 5,667,198 5.06 4.50 1.2 % 8.4 % Subordinated 394,037 56.60 70.16 4.0 % 9.9 % Subordinated, interest-only 221,549 4.48 5.26 1.1 % 16.4 % Agency MBS Residential pass-through 8,984,249 102.47 102.12 4.0 % 3.6 % Commercial pass-through 2,895,679 101.98 99.50 3.6 % 3.4 % Interest-only 3,028,572 4.49 4.40 0.8 % 4.3 % (1) Bond Equivalent Yield at period end. December 31, 2017 Principal or Notional Value at Period-End Weighted Average Amortized Weighted Average Fair Value Weighted Average Weighted Average Yield at Period-End (1) Non-Agency RMBS Senior $ 2,733,926 $ 54.04 $ 81.62 4.6 % 16.7 % Senior, interest-only 4,862,461 5.41 4.34 1.3 % 8.0 % Subordinated 501,455 66.77 80.01 4.1 % 9.6 % Subordinated, interest-only 201,378 3.66 3.89 0.8 % 11.8 % Agency MBS Residential pass-through 2,227,128 105.53 104.27 3.8 % 2.9 % Commercial pass-through 1,894,594 102.26 102.31 3.6 % 3.2 % Interest-only 3,021,840 3.68 3.45 0.7 % 3.4 % (1) Bond Equivalent Yield at period end.
Credit ratings of residential MBS	The following table presents the weighted average credit rating of the Company’s Non-Agency RMBS portfolio at December 31, 2018 and December 31, 2017 based on fair value. We believe fair value provides an improved representation of the credit rating distribution of the Company's Non-Agency RMBS portfolio. December 31, 2018 December 31, 2017 AAA 0.5 % — % AA 0.1 % — % A 0.3 % — % BBB 0.4 % 0.5 % BB 3.6 % 0.7 % B 1.1 % 0.6 % Below B or not rated 94.0 % 98.2 % Total 100.0 % 100.0 %
Schedule of MBS by estimated weighted average life classification	The following tables provide a summary of the fair value and amortized cost of the Company’s MBS at December 31, 2018 and December 31, 2017 according to their estimated weighted-average life classifications. The weighted-average lives of the MBS in the tables below are based on lifetime expected prepayment rates using an industry prepayment model for the Agency MBS portfolio and the Company’s prepayment assumptions for the Non-Agency RMBS. The prepayment model considers current yield, forward yield, steepness of the interest rate curve, current mortgage rates, mortgage rates of the outstanding loan, loan age, margin, and volatility. December 31, 2018 (dollars in thousands) Weighted Average Life Less than one year Greater than one year and less than five years Greater than five years and less than ten years Greater than ten years Total Fair value Non-Agency RMBS Senior $ 7,611 $ 357,543 $ 946,536 $ 631,434 $ 1,943,124 Senior interest-only 1,189 38,407 96,401 118,893 254,890 Subordinated — 39,825 43,744 192,898 276,467 Subordinated interest-only — 303 9,321 2,025 11,649 Agency MBS Residential — 640,713 8,524,211 9,458 9,174,382 Commercial — 15,468 28,205 2,837,549 2,881,222 Interest-only 65,675 48,580 19,091 — 133,346 Total fair value $ 74,475 $ 1,140,839 $ 9,667,509 $ 3,792,257 $ 14,675,080 Amortized cost Non-Agency RMBS Senior $ 7,522 $ 277,025 $ 585,187 $ 404,484 $ 1,274,218 Senior interest-only 2,250 46,944 111,538 126,210 286,942 Subordinated — 29,487 26,036 167,487 223,010 Subordinated interest-only — 428 7,358 2,146 9,932 Agency MBS Residential — 645,368 8,550,766 9,721 9,205,855 Commercial — 15,543 29,447 2,907,947 2,952,937 Interest-only 64,185 53,076 18,765 — 136,026 Total amortized cost $ 73,957 $ 1,067,871 $ 9,329,097 $ 3,617,995 $ 14,088,920 December 31, 2017 (dollars in thousands) Weighted Average Life Less than one year Greater than one year and less than five years Greater than five years and less than ten years Greater than ten years Total Fair value Non-Agency RMBS Senior $ 2,179 $ 681,086 $ 910,234 $ 637,916 $ 2,231,415 Senior interest-only 19 54,107 72,702 84,022 210,850 Subordinated — 75,495 121,555 204,175 401,225 Subordinated interest-only — 7,165 661 — 7,826 Agency MBS Residential — 21,777 2,300,403 — 2,322,180 Commercial — 45,770 16,559 1,875,952 1,938,281 Interest-only — 74,490 25,271 4,606 104,367 Total fair value $ 2,198 $ 959,890 $ 3,447,385 $ 2,806,671 $ 7,216,144 Amortized cost Non-Agency RMBS Senior $ 2,124 $ 493,965 $ 569,458 $ 411,816 $ 1,477,363 Senior interest-only 1,271 73,758 94,145 93,822 262,996 Subordinated — 61,987 91,044 181,789 334,820 Subordinated interest-only — 6,355 1,014 — 7,369 Agency MBS Residential — 22,069 2,328,304 — 2,350,373 Commercial — 47,170 17,176 1,872,993 1,937,339 Interest-only — 79,356 27,582 4,339 111,277 Total amortized cost $ 3,395 $ 784,660 $ 3,128,723 $ 2,564,759 $ 6,481,537
Schedule of collateral characteristics of underlying Mortgages of Non-Agency RMBS portfolio	The Non-Agency RMBS in the Portfolio have the following collateral characteristics at December 31, 2018 and December 31, 2017 . December 31, 2018 December 31, 2017 Weighted average maturity (years) 21.3 20.7 Weighted average amortized loan to value (1) 62.9 % 64.4 % Weighted average FICO (2) 708 697 Weighted average loan balance (in thousands) $ 308 $ 314 Weighted average percentage owner occupied 85.7 % 84.4 % Weighted average percentage single family residence 63.8 % 66.3 % Weighted average current credit enhancement 1.4 % 2.2 % Weighted average geographic concentration of top four states CA 33.8 % CA 31.7 % FL 7.7 % NY 8.5 % NY 7.4 % FL 8.3 % NJ 2.1 % NJ 2.7 % (1) Value represents appraised value of the collateral at the time of loan origination. (2) FICO as determined at the time of loan origination.
Schedule of percentage of Non-Agency RMBS by year originated	The table below presents the origination year of the underlying loans related to the Company’s portfolio of Non-Agency RMBS at December 31, 2018 and December 31, 2017 based on fair value. We believe fair value provides an improved representation of the origination years of the Company's Non-Agency RMBS portfolio. Origination Year December 31, 2018 December 31, 2017 2003 and prior 1.3 % 1.6 % 2004 1.7 % 0.9 % 2005 12.9 % 12.5 % 2006 49.8 % 46.4 % 2007 31.0 % 36.5 % 2008 and later 3.3 % 2.1 % Total 100.0 % 100.0 %
Schedule of gains and losses from sales of investments	The proceeds and gross realized gains and gross realized losses from sales of investments for the year ended December 31, 2018 , 2017 and 2016 are as follows: For the Year Ended December 31, 2018 December 31, 2017 December 31, 2016 (dollars in thousands) Proceeds from sales $ 116,975 $ 812,005 $ 2,719,329 Gross realized gains 7,547 17,538 28,572 Gross realized losses (10,391 ) (8,415 ) (10,417 ) Net realized gain (loss) $ (2,844 ) $ 9,123 $ 18,155

Loans Held for Investment (Tabl

Loans Held for Investment (Tables)	12 Months Ended
	Dec. 31, 2018
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Summary of changes in carrying value of securitized loans held for investment carried at fair value	The following table provides a summary of the changes in the carrying value of Loans held for investment at fair value at December 31, 2018 and December 31, 2017 : For the Year Ended December 31, 2018 December 31, 2017 (dollars in thousands) Balance, beginning of period $ 13,678,263 $ 8,753,653 Purchases 1,671,330 6,539,765 Principal paydowns (1,859,155 ) (1,788,409 ) Sales and settlements (807,364 ) 2,876 Net periodic accretion (amortization) (83,393 ) (35,803 ) Realized gains (losses) on sales and settlements 101 — Change in fair value (27,201 ) 206,181 Balance, end of period $ 12,572,581 $ 13,678,263
Schedule of percentage of securitized loans held for investment carried at fair value by year originated	The loan portfolio for all residential mortgages were originated during the following years: Origination Year December 31, 2018 December 31, 2017 2002 and prior 7.3 % 7.5 % 2003 6.6 % 6.7 % 2004 13.6 % 14.6 % 2005 19.5 % 20.4 % 2006 22.7 % 23.1 % 2007 19.5 % 19.0 % 2008 6.2 % 6.0 % 2009 1.0 % 0.7 % 2010 and later 3.6 % 2.0 % Total 100.0 % 100.0 %
Schedule of securitized loans held for investment types and characteristics of underlying collateral	The following tables show various characteristics of our residential loan portfolio and outstanding principal balance of the loans that are 30 days delinquent and greater for the year ended December 31, 2018 and 2017 , respectively. December 31, 2018 (dollars in thousands) Loan Balance Number of Loans Interest Rate Maturity Date Total Principal 30-89 Days Delinquent 90+ Days Delinquent Held-for-Investment at fair value: Adjustable rate loans: $1 to $250 8,258 1.00% to 19.49% 6/1/1983 - 6/1/2058 $ 713,392 $ 80,781 $ 48,235 $250 to $500 456 2.00% to 12.75% 3/1/2023 - 2/1/2057 148,867 17,722 10,779 $500 to $750 65 2.00% to 10.00% 1/1/2034 - 8/1/2047 38,148 2,979 2,762 $750 to $1,000 7 4.13% to 5.13% 4/1/2035 - 4/1/2038 6,008 784 — Over $1,000 7 4.00% to 5.00% 7/1/2037 - 8/1/2039 12,195 — 1,164 8,793 $ 918,610 $ 102,266 $ 62,940 Fixed loans: $1 to $250 126,085 0.00% to 24.00% 6/1/1989 - 5/1/2062 $ 9,566,517 $ 894,574 $ 591,283 $250 to $500 4,942 0.00% to 12.52% 4/1/2018 - 11/1/2061 1,595,673 160,015 128,876 $500 to $750 406 2.00% to 10.69% 7/1/2031 - 5/1/2058 238,292 12,239 10,600 $750 to $1,000 88 2.00% to 7.98% 3/1/2013 - 12/1/2055 75,289 2,677 1,805 Over $1,000 31 3.00% to 6.38% 6/1/2037 - 6/1/2057 38,200 — — 131,552 $ 11,513,971 $ 1,069,505 $ 732,564 Total 140,345 $ 12,432,581 $ 1,171,771 $ 795,504 The foreclosure, bankruptcy, and REO principal balances on our loans were $ 292 million , $ 266 million and $ 47 million , respectively, as of December 31, 2018 , which are included in the table above. December 31, 2017 (dollars in thousands) Loan Balance Number of Loans Interest Rate Maturity Date Total Principal 30-89 Days Delinquent 90+ Days Delinquent Held-for-Investment at fair value: Adjustable rate loans: $1 to $250 9,227 1.00% to 18.74% 9/1/1992 - 6/1/2057 $ 827,020 $ 95,952 $ 46,343 $250 to $500 529 2.00% to 11.88% 11/1/2028 - 12/1/2056 171,266 19,289 11,855 $500 to $750 67 2.00% to 9.25% 1/1/2034 - 9/1/2046 39,212 3,041 2,382 $750 to $1,000 9 3.88% to 5.55% 1/1/2035 - 12/1/2045 7,663 757 — Over $1,000 8 3.88% to 4.00% 7/1/2037 - 8/1/2039 13,702 2,705 1,164 9,840 $ 1,058,863 $ 121,744 $ 61,744 Hybrid loans: $500 to $750 1 6.88% to 6.88% 1/1/2038 - 1/1/2038 $ 702 $ — $ — 1 $ 702 $ — $ — Fixed loans: $1 to $250 133,437 0.00% to 24.00% 9/1/1994 - 5/1/2062 $ 10,371,829 $ 960,564 $ 562,271 $250 to $500 5,324 0.00% to 12.52% 4/1/2018 - 11/1/2065 1,713,839 188,257 114,616 $500 to $750 440 2.00% to 10.69% 7/1/2031 - 9/1/2057 258,058 12,789 13,459 $750 to $1,000 99 2.00% to 7.69% 3/1/2013 - 12/1/2055 84,701 1,706 877 Over $1,000 31 3.00% to 5.75% 12/1/2040 - 7/1/2056 37,828 1,155 — 139,331 $ 12,466,255 $ 1,164,471 $ 691,223 Total 149,172 $ 13,525,820 $ 1,286,215 $ 752,967
Seasoned Subprime Residential Mortgage Loans
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Schedule of securitized loans held for investment carried at fair value key characteristics of underlying collateral	The following table presents a summary of key characteristics of the residential loan portfolio at December 31, 2018 and December 31, 2017 : December 31, 2018 December 31, 2017 Number of loans 140,345 149,172 Weighted average maturity (years) 18.6 18.8 Weighted average loan to value (1) 87.5 % 88.0 % Weighted average FICO (1) 629 631 Weighted average loan balance (in thousands) $ 89 $ 91 Weighted average percentage owner occupied 90.1 % 95.0 % Weighted average percentage single family residence 86.3 % 86.0 % Weighted average geographic concentration of top five states CA 9.0 % CA 9.0 % FL 7.3 % FL 7.2 % OH 5.9 % OH 6.1 % NY 5.7 % PA 5.6 % PA 5.6 % VA 5.5 % (1) As provided by the Trustee.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Schedule of unpaid principal, fair value and impact of change in fair value	The table below shows the unpaid principal, fair value and impact of change in fair value on each of the financial instruments carried with fair value option as of December 31, 2018 and 2017 , respectively: December 31, 2018 (dollars in thousands) Unpaid Fair Value Year to Date Gain/(Loss) on Change in Fair Value Assets: Non-agency RMBS Subordinated N/A $ 12,014 $ (145 ) Senior, interest-only 5,667,198 254,890 20,095 Subordinated, interest-only 221,549 11,649 1,261 Agency MBS Residential Pass-through 7,573,835 7,739,382 31,185 Commercial Pass-through 1,607,626 1,595,681 (35,002 ) Interest-only 3,028,572 133,346 4,230 Loans held for investment, at fair value 12,432,582 12,572,581 (27,201 ) Liabilities: Securitized debt at fair value, collateralized by loans held for investment 8,561,319 8,455,376 52,209 December 31, 2017 (dollars in thousands) Unpaid Fair Value Year to Date Gain/(Loss) on Change in Fair Value Assets: Non-agency RMBS Subordinated N/A $ 13,993 $ 1,246 Senior, interest-only 4,862,461 210,850 (13,290 ) Subordinated, interest-only 201,378 7,826 2,311 Agency MBS Residential Pass-through 577,522 602,829 (4,816 ) Commercial Pass-through 564,379 570,105 (2,398 ) Interest-only 3,021,840 104,367 465 Loans held for investment, at fair value 13,525,820 13,678,263 206,181 Liabilities: Securitized debt at fair value, collateralized by loans held for investment 9,395,854 9,388,657 (78,289 )
Schedule of financial assets and liabilities carried at fair value on a recurring basis	The Company’s financial assets and liabilities carried at fair value on a recurring basis, including the level in the fair value hierarchy, at December 31, 2018 and December 31, 2017 are presented below. December 31, 2018 (dollars in thousands) Level 1 Level 2 Level 3 Counterparty and Cash Collateral, netting Total Assets: Non-Agency RMBS, at fair value $ — $ — $ 2,486,130 $ — $ 2,486,130 Agency MBS, at fair value — 12,188,950 — — 12,188,950 Loans held for investment, at fair value — — 12,572,581 — 12,572,581 Derivatives — 89,121 — (51,653 ) 37,468 Liabilities: Securitized debt at fair value, collateralized by loans held for investment — — 8,455,376 — 8,455,376 Derivatives 13,375 169,790 — (183,165 ) — December 31, 2017 (dollars in thousands) Level 1 Level 2 Level 3 Counterparty and Cash Collateral, netting Total Assets: Non-Agency RMBS, at fair value $ — $ — 2,851,316 $ — $ 2,851,316 Agency MBS, at fair value — 4,364,828 — — 4,364,828 Loans held for investment, at fair value — — 13,678,263 — 13,678,263 Derivatives 3,553 46,978 — (1,617 ) 48,914 Liabilities: Securitized debt at fair value, collateralized by loans held for investment — — 9,388,657 — 9,388,657 Derivatives — 1,937 — (1,617 ) 320
Summary of the changes in the fair value of securities classified as Level 3	The table below provides a summary of the changes in the fair value of securities classified as Level 3 at December 31, 2018 and December 31, 2017 . Fair Value Reconciliation, Level 3 For the Year Ended, December 31, 2018 (dollars in thousands) Non-Agency RMBS Loans held for investment Securitized Debt Beginning balance Level 3 $ 2,851,316 $ 13,678,263 $ 9,388,657 Transfers in to Level 3 — — — Transfers out of Level 3 — — — Purchases of assets/ issuance of debt 253,952 1,671,330 1,769,539 Principal payments (521,109 ) (1,859,155 ) (1,778,625 ) Sales and Settlements (100,786 ) (807,364 ) (834,414 ) Net accretion (amortization) 101,088 (83,393 ) (11,197 ) Gains (losses) included in net income Other than temporary credit impairment losses (21,791 ) — — Realized gains (losses) on sales and settlements 201 101 (26,375 ) Net unrealized gains (losses) included in income 21,208 (27,201 ) (52,209 ) Gains (losses) included in other comprehensive income Total unrealized gains (losses) for the period (97,949 ) — — Ending balance Level 3 $ 2,486,130 $ 12,572,581 $ 8,455,376 Fair Value Reconciliation, Level 3 For the Year Ended, December 31, 2017 (dollars in thousands) Non-Agency RMBS Loans held for investment Securitized Debt Beginning balance Level 3 $ 3,330,063 $ 8,753,653 $ 6,941,097 Transfers in to Level 3 6,112 — — Transfers out of Level 3 — — — Purchases of assets/ issuance of debt 78,400 6,539,765 5,173,430 Principal payments (568,339 ) (1,788,409 ) (1,787,368 ) Sales and Settlements (68,162 ) 2,876 (1,056,765 ) Net accretion (amortization) 120,119 (35,803 ) 4,701 Gains (losses) included in net income Other than temporary credit impairment losses (59,881 ) — — Realized gains (losses) on sales and settlements 12,031 — 35,273 Net unrealized gains (losses) included in income (9,733 ) 206,181 78,289 Gains (losses) included in other comprehensive income Total unrealized gains (losses) for the period 10,706 — — Ending balance Level 3 $ 2,851,316 $ 13,678,263 $ 9,388,657
A summary of the significant inputs used to estimate the fair value of securitized debt at fair value, collateralized by loans held for investment	A summary of the significant inputs used to estimate the fair value of securitized debt at fair value, collateralized by loans held for investment, as of December 31, 2018 and December 31, 2017 follows: December 31, 2018 December 31, 2017 Significant Inputs Significant Inputs Weighted Average Discount Rate CPR Range CDR Range Loss Severity Range Weighted Average Discount Rate CPR Range CDR Range Loss Severity Range Securitized debt at fair value, collateralized by loans held for investment 4.3% 6% - 18% 0% - 23% 30% - 65% 4.1% 6% - 15% 0% - 6% 35% - 60%
Schedule of carrying value and fair value of financial instruments not carried at fair value on a recurring basis	The following table presents the carrying value and fair value, as described above, of the Company’s financial instruments not carried at fair value on a recurring basis at December 31, 2018 and December 31, 2017 . December 31, 2018 (dollars in thousands) Level in Fair Value Hierarchy Carrying Amount Fair Value Repurchase agreements 2 14,030,465 14,085,164 Securitized debt, collateralized by Non-Agency RMBS 3 159,955 140,711 December 31, 2017 (dollars in thousands) Level in Fair Value Hierarchy Carrying Amount Fair Value Repurchase agreements 2 7,250,452 7,269,193 Securitized debt, collateralized by Non-Agency RMBS 3 205,780 192,259
Non-agency MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
A summary of the significant inputs used to estimate the fair value of securitized debt at fair value, collateralized by loans held for investment	A summary of the significant inputs used to estimate the fair value of Non-Agency RMBS held for investment at fair value as of December 31, 2018 and December 31, 2017 follows: December 31, 2018 December 31, 2017 Significant Inputs Significant Inputs Weighted Average Discount Rate CPR CDR Loss Severity Weighted Average Discount Rate CPR CDR Loss Severity Range Range Non-Agency RMBS Senior 4.5% 1% -25% 0% -60% 35% -95% 4.4% 1% -45% 0% -55% 35% -89% Senior interest-only 11.1% 3% -32% 0% -60% 30% -95% 11.2% 3% -25% 0% -50% 35% -95% Subordinated 5.8% 1% -19% 0% -34% 10% -70% 5.8% 1% -20% 0% -33% 35% -69% Subordinated interest-only 12.0% 4% -25% 0% -24% 35% -68% 12.0% 6% -22% 0% -9% 35% -63%
Loans Held for Investment at Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
A summary of the significant inputs used to estimate the fair value of securitized debt at fair value, collateralized by loans held for investment	A summary of the significant inputs used to estimate the fair value of Loans held for investment collateralized by seasoned subprime mortgages at fair value as of December 31, 2018 and December 31, 2017 follows: December 31, 2018 December 31, 2017 Factor: Coupon Base Rate 5.2% 4.8% Actual 6.9% 6.9% FICO Base Rate 638 636 Actual 626 627 Loan-to-value (LTV) Base Rate 88% 89% Actual 88% 88% Loan Characteristics: Occupancy Owner Occupied 90% 95% Investor 1% 1% Secondary 9% 4% Property Type Single family 86% 87% Manufactured housing 4% 4% Multi-family/mixed use/other 10% 9%

Repurchase Agreements (Tables)

Repurchase Agreements (Tables)	12 Months Ended
	Dec. 31, 2018
Banking and Thrift [Abstract]
Schedule of repurchase agreements	The repurchase agreements outstanding, weighted average borrowing rates, weighted average remaining maturities, average daily balances and the fair value of collateral pledged as of December 31, 2018 and December 31, 2017 were: December 31, 2018 December 31, 2017 Repurchase agreements outstanding secured by: Agency MBS (in thousands) $ 10,193,272 $ 3,202,056 Non-agency MBS and Loans held for investment (in thousands) 3,837,193 4,048,396 Total: $ 14,030,465 $ 7,250,452 Average balance of Repurchase agreements secured by: Agency MBS (in thousands) $ 6,085,643 $ 3,120,474 Non-agency MBS and Loans held for investment (in thousands) 3,730,527 3,203,700 Total: $ 9,816,170 $ 6,324,174 Average borrowing rate of Repurchase agreements secured by: Agency MBS 2.55 % 1.47 % Non-agency MBS and Loans held for investment 4.04 % 3.41 % Average remaining maturity of Repurchase agreements secured by: Agency MBS 30 Days 28 Days Non-agency MBS and Loans held for investment 231 Days 93 Days Average original maturity of Repurchase agreements secured by: Agency MBS 88 Days 87 Days Non-agency MBS and Loans held for investment 259 Days 123 Days MBS pledged as collateral at fair value on Repurchase agreements: Agency MBS (in thousands) $ 10,832,018 $ 3,450,123 Non-agency MBS and Loans held for investment (in thousands) 4,998,990 5,338,557 Total: $ 15,831,008 $ 8,788,680 At December 31, 2018 and December 31, 2017 , the repurchase agreements collateralized by MBS and Loans held for investment had the following remaining maturities. December 31, 2018 December 31, 2017 (dollars in thousands) Overnight $ — $ — 1 to 29 days 6,326,232 4,745,342 30 to 59 days 4,620,656 1,206,769 60 to 89 days 1,504,695 592,865 90 to 119 days 169,244 — Greater than or equal to 120 days 1,409,638 705,476 Total $ 14,030,465 $ 7,250,452

Securitized Debt (Tables)

Securitized Debt (Tables)	12 Months Ended
	Dec. 31, 2018
Debt Instrument [Line Items]
Schedule of callable debt	The following table presents the par value of the callable debt by year at December 31, 2018 . December 31, 2018 (dollars in thousands) Year Principal 2019 $ 324,966 2020 4,188,854 2021 3,457,006 2022 274,152 2023 130,811 Total $ 8,375,789
Non-agency MBS
Debt Instrument [Line Items]
Schedule of maturities of long-term debt	The following table presents the estimated principal repayment schedule of the securitized debt collateralized by Non-Agency RMBS at December 31, 2018 and December 31, 2017 , based on expected cash flows of the residential mortgage loans or RMBS, as adjusted for projected losses on the underlying collateral of the debt. All of the securitized debt recorded in the Company’s Consolidated Statements of Financial Condition is non-recourse to the Company. December 31, 2018 December 31, 2017 (dollars in thousands) Within One Year $ 23,602 $ 42,217 One to Three Years 30,803 45,916 Three to Five Years 8,047 16,524 Greater Than Five Years 3,605 4,867 Total $ 66,057 $ 109,524
Loans held for investment
Debt Instrument [Line Items]
Schedule of maturities of long-term debt	The following table presents the estimated principal repayment schedule of the securitized debt collateralized by loans held for investment at December 31, 2018 and December 31, 2017 , based on expected cash flows of the residential mortgage loans or RMBS, as adjusted for projected losses on the underlying collateral of the debt. All of the securitized debt recorded in the Company’s Consolidated Statements of Financial Condition is non-recourse to the Company. December 31, 2018 December 31, 2017 (dollars in thousands) Within One Year $ 1,608,381 $ 1,819,018 One to Three Years 2,587,635 2,872,572 Three to Five Years 1,949,060 2,140,434 Greater Than Five Years 2,237,259 2,439,872 Total $ 8,382,335 $ 9,271,896

Consolidated Securitization V_2

Consolidated Securitization Vehicles and Other Variable Interest Entities (Tables)	12 Months Ended
	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of assets and liabilities related to the consolidated VIEs	The table below reflects the assets and liabilities recorded in the Consolidated Statements of Financial Condition related to the consolidated VIEs as of December 31, 2018 and December 31, 2017 . December 31, 2018 December 31, 2017 (dollars in thousands) Assets: Non-Agency RMBS, at fair value $ 1,017,442 $ 1,579,793 Loans held for investment, at fair value 12,263,265 13,263,338 Accrued interest receivable 72,389 75,489 Other assets 39,855 68,844 Liabilities: Securitized debt, collateralized by Non-Agency RMBS $ 159,955 $ 205,780 Securitized debt at fair value, collateralized by loans held for investment 8,455,376 9,388,657 Accrued interest payable 33,541 33,870 Other liabilities 3,286 3,513
Schedule of Income, OTTI and expense amounts related to consolidated VIEs	Income, OTTI and expense amounts related to consolidated VIEs recorded in the Consolidated Statements of Operations is presented in the tables below. For the Year Ended December 31, 2018 December 31, 2017 December 31, 2016 (dollars in thousands) Interest income, Assets of consolidated VIEs $ 904,830 $ 914,022 $ 678,623 Interest expense, Non-recourse liabilities of VIEs 395,255 390,858 249,708 Net interest income $ 509,575 $ 523,164 $ 428,915 Total other-than-temporary impairment losses $ (1,026 ) $ (2,174 ) $ (1,274 ) Portion of loss recognized in other comprehensive income (loss) (17,820 ) (51,118 ) (37,475 ) Net other-than-temporary credit impairment losses $ (18,845 ) $ (53,292 ) $ (38,749 ) Servicing fees $ 39,313 $ 41,493 $ 31,178

Derivative Instruments (Tables)

Derivative Instruments (Tables)	12 Months Ended
	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of location and fair value of the derivatives	The table below summarizes the location and fair value of the derivatives reported in the Consolidated Statements of Financial Condition after counterparty netting and posting of cash collateral as of December 31, 2018 and December 31, 2017 . December 31, 2018 Derivative Assets Derivative Liabilities Derivative Instruments Notional Amount Outstanding Location on Consolidated Statements of Financial Condition Net Estimated Fair Value/Carrying Value Location on Consolidated Statements of Financial Condition Net Estimated Fair Value/Carrying Value (dollars in thousands) Interest Rate Swaps $ 10,906,700 Derivatives, at fair value, net $ 35,798 Derivatives, at fair value, net $ — Swaptions 53,000 Derivatives, at fair value, net 1,670 Derivatives, at fair value, net — Treasury Futures 619,700 Derivatives, at fair value, net — Derivatives, at fair value, net — Total $ 11,579,400 $ 37,468 $ — December 31, 2017 Derivative Assets Derivative Liabilities Derivative Instruments Notional Amount Outstanding Location on Consolidated Statements of Financial Condition Net Estimated Fair Value/Carrying Value Location on Consolidated Statements of Financial Condition Net Estimated Fair Value/Carrying Value (dollars in thousands) Interest Rate Swaps $ 3,816,400 Derivatives, at fair value, net $ 43,257 Derivatives, at fair value, net $ — Swaptions 391,000 Derivatives, at fair value, net 2,105 Derivatives, at fair value, net 320 Treasury Futures 619,700 Derivatives, at fair value, net 3,552 Derivatives, at fair value, net — Total $ 4,827,100 $ 48,914 $ 320
Schedule of derivative instruments effects on operating results	The effect of the Company’s derivatives on the Consolidated Statements of Operations is presented below. Net gains (losses) on derivatives Derivative Instruments Location on Consolidated Statements of December 31, 2018 December 31, 2017 December 31, 2016 (dollars in thousands) Interest Rate Swaps Net unrealized gains (losses) on derivatives $ (125,595 ) $ 43,697 $ 47,170 Interest Rate Swaps Net realized gains (losses) on derivatives (1) (1,488 ) (31,593 ) (88,722 ) Treasury Futures Net unrealized gains (losses) on derivatives (16,928 ) 1,768 378 Treasury Futures Net realized gains (losses) on derivatives 21,333 (4,061 ) (9,170 ) Swaptions Net unrealized gains (losses) on derivatives 1,361 2,511 2,545 Swaptions Net realized gains (losses) on derivatives (1,476 ) (6,134 ) (7,044 ) Other Derivative Assets Net unrealized gains (losses) on derivatives — — — Other Derivative Assets Net realized gains (losses) on derivatives — — (566 ) Total $ (122,793 ) $ 6,188 $ (55,409 ) (1) Includes loss on terminations of interest rate swaps of $16 million and $ 61 million for the years ended December 31, 2017 and 2016 , respectively. There were no swaps terminations during the year ended December 31, 2018 .

Capital Stock (Tables)

Capital Stock (Tables)	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Schedule of earnings per share	Earnings per share for the years ended December 31, 2018 , 2017 and 2016 respectively, are computed as follows: For the Year Ended December 31, 2018 December 31, 2017 December 31, 2016 (dollars in thousands) Numerator: Net income available to common shareholders $ 368,440 $ 491,184 $ 549,494 Effect of dilutive securities: — — — Dilutive net income available to common shareholders $ 368,440 $ 491,184 $ 549,494 Denominator: Weighted average basic shares 187,146,170 187,780,355 187,728,634 Effect of dilutive securities 602,692 506,965 296,204 Weighted average dilutive shares 187,748,862 188,287,320 188,024,838 Net income per average share attributable to common stockholders - Basic $ 1.97 $ 2.62 $ 2.93 Net income per average share attributable to common stockholders - Diluted $ 1.96 $ 2.61 $ 2.92

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Schedule of components of AOCI	The following table presents the changes in the components of Accumulated Other Comprehensive Income, or the AOCI, for the year ended December 31, 2018 and 2017 : December 31, 2018 (dollars in thousands) Unrealized gains (losses) on available-for-sale securities, net Total Accumulated OCI Balance Balance as of December 31, 2017 $ 796,902 $ 796,902 OCI before reclassifications (185,570 ) (185,570 ) Amounts reclassified from AOCI 15,500 15,500 Net current period OCI (170,070 ) (170,070 ) Balance as of December 31, 2018 $ 626,832 $ 626,832 December 31, 2017 (dollars in thousands) Unrealized gains (losses) on available-for-sale securities, net Total Accumulated OCI Balance Balance as of December 31, 2016 $ 718,106 $ 718,106 OCI before reclassifications 24,218 24,218 Amounts reclassified from AOCI 54,578 54,578 Net current period OCI 78,796 78,796 Balance as of December 31, 2017 $ 796,902 $ 796,902
Schedule of reclassifications from AOCI	The following table presents the details of the reclassifications from AOCI for the year ended December 31, 2018 and 2017 : December 31, 2018 December 31, 2017 Details about Accumulated OCI Components Amounts Reclassified from Accumulated OCI Amounts Reclassified from Accumulated OCI Affected Line on the Consolidated Statements Of Operations Unrealized gains and losses on available-for-sale securities $ 6,291 $ 7,278 Net realized gains (losses) on sales of investments (21,791 ) (61,856 ) Net other-than-temporary credit impairment losses $ (15,500 ) $ (54,578 ) Income before income taxes — — Income taxes $ (15,500 ) $ (54,578 ) Net of tax

Equity Compensation, Employme_2

Equity Compensation, Employment Agreements and other Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2018
Compensation Related Costs [Abstract]
Share-based Compensation, Performance Shares Award Nonvested Activity	The following table presents information with respect to the Company's stock awards during the years ended December 31, 2018 and 2017 . For the Year Ended December 31, 2018 December 31, 2017 Number of Shares Weighted Average Grant Date Fair Value Number of Shares Weighted Average Grant Date Fair Value Unvested shares outstanding - beginning of period 769,815 25.58 577,547 14.53 Granted 467,657 17.90 348,244 18.68 Vested (69,303 ) 15.99 (155,976 ) 30.74 Forfeited (8,986 ) 18.40 — — Unvested shares outstanding - end of period 1,159,183 16.51 769,815 25.58

Credit Risk and Interest Rate_2

Credit Risk and Interest Rate Risk (Tables)	12 Months Ended
	Dec. 31, 2018
Offsetting [Abstract]
Schedule of assets and liabilities subject to netting arrangements	The following table presents information about our liabilities that are subject to such arrangements and can potentially be offset on our consolidated statements of financial condition as of December 31, 2018 and December 31, 2017 . December 31, 2018 (dollars in thousands) Gross Amounts of Recognized Assets (Liabilities) Gross Amounts Offset in the Consolidated Statements of Financial Position Net Amounts Offset in the Consolidated Statements of Financial Position Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position Financial Instruments Cash Collateral (Received) Pledged (1) Net Amount Repurchase Agreements $ (14,030,465 ) $ — $ (14,030,465 ) $ 15,831,008 $ — $ 1,800,543 Interest Rate Swaps - Gross Assets 87,451 (51,653 ) 35,798 — 198,112 233,910 Interest Rate Swaps - Gross Liabilities (169,790 ) 169,790 — — — — Treasury Futures - Gross Assets — — — — 3,220 3,220 Treasury Futures - Gross Liabilities (13,375 ) 13,375 — — — — Swaptions - Gross Assets 1,670 — 1,670 — — 1,670 Swaptions - Gross Liabilities — — — — — — Total Liabilities $ (14,124,509 ) $ 131,512 $ (13,992,997 ) $ 15,831,008 $ 201,332 $ 2,039,343 (1) Included in other assets December 31, 2017 (dollars in thousands) Gross Amounts of Recognized Assets (Liabilities) Gross Amounts Offset in the Consolidated Statements of Financial Position Net Amounts Offset in the Consolidated Statements of Financial Position Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position Financial Instruments Cash Collateral (Received) Pledged (1) Net Amount Repurchase Agreements $ (7,250,452 ) $ — $ (7,250,452 ) $ 8,788,680 $ 1,156 $ 1,539,384 Interest Rate Swaps - Gross Assets 44,874 (1,617 ) 43,257 — 11,570 54,827 Interest Rate Swaps - Gross Liabilities (1,617 ) 1,617 — — — — Treasury Futures - Gross Assets 3,552 — 3,552 — 376 3,928 Treasury Futures - Gross Liabilities — — — — — — Swaptions - Gross Assets 2,105 — 2,105 — — 2,105 Swaptions - Gross Liabilities (320 ) — (320 ) — — (320 ) Total Liabilities $ (7,201,858 ) $ — $ (7,201,858 ) $ 8,788,680 $ 13,102 $ 1,599,924 (1) Included in other assets

Summarized Quarterly Results _2

Summarized Quarterly Results (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information	The following is a presentation of the results of operations for the quarters ended December 31, 2018, September 30, 2018, June 30, 2018 and March 31, 2018. For the Quarter Ended December 31, 2018 September 30, 2018 June 30, 2018 March 31, 2018 (dollars in thousands, except per share data) Net Interest Income: Interest income $ 348,033 $ 321,715 $ 306,436 $ 297,132 Interest expense 193,920 174,671 161,266 149,251 Net interest income 154,113 147,044 145,170 147,881 Net other-than-temporary credit impairment losses (4,269 ) (7,233 ) (9,131 ) (1,158 ) Net gains (losses) on derivatives (315,877 ) 74,078 24,502 94,504 Net unrealized gains (losses) on financial instruments at fair value 84,836 (34,306 ) (18,364 ) 14,466 Net realized gains (losses) on sales of investments 1,213 (6,123 ) 2,167 — Gain (loss) on Extinguishment of Debt 7,055 9,263 387 9,670 Total other expenses 29,855 25,395 26,587 26,322 Net income (loss) $ (102,798 ) $ 157,321 $ 118,108 $ 239,007 Dividend on preferred stock $ 14,437 $ 9,960 $ 9,400 $ 9,400 Net income (loss) available to common shareholders $ (117,235 ) $ 147,361 $ 108,708 $ 229,607 Net income per common share-basic $ (0.63 ) $ 0.79 $ 0.58 $ 1.22 The following is a presentation of the results of operations for the quarters ended December 31, 2017, September 30, 2017, June 30, 2017 and March 31, 2017. For the Quarter Ended December 31, 2017 September 30, 2017 June 30, 2017 March 31, 2017 (dollars in thousands, except per share data) Net Interest Income: Interest income $ 301,957 $ 296,813 $ 288,644 $ 251,344 Interest expense 144,204 140,358 137,955 110,231 Net interest income 157,753 156,455 150,689 141,113 Net other-than-temporary credit impairment losses (18,179 ) (11,468 ) (13,509 ) (18,701 ) Net gains (losses) on derivatives 31,108 1,363 (21,822 ) (4,462 ) Net unrealized gains (losses) on financial instruments at fair value (47,637 ) 19,042 67,762 72,243 Net realized gains (losses) on sales of investments (586 ) 1 4,541 5,167 Gain (loss) on Extinguishment of Debt 12,742 (1 ) (48,014 ) — Total other expenses 27,657 26,142 24,491 32,537 Net income (loss) $ 107,608 $ 139,232 $ 115,017 $ 162,807 Dividend on preferred stock $ 9,400 $ 9,400 $ 9,400 $ 5,283 Net income (loss) available to common shareholders $ 98,208 $ 129,832 $ 105,617 $ 157,524 Net income per common share-basic $ 0.52 $ 0.69 $ 0.56 $ 0.84

Organization - Narrative (Detai

Organization - Narrative (Detail)	12 Months Ended
	Dec. 31, 2018subsidiary
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of wholly owned direct subsidiaries	9

Summary of the Significant Ac_3

Summary of the Significant Accounting Policies (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016	[1]
Investment [Line Items]
Non-Agency RMBS, at fair value	$ 2,486,130,000				$ 2,851,316,000				$ 2,486,130,000		$ 2,851,316,000
Agency MBS, at fair value	12,188,950,000				4,364,828,000				12,188,950,000		4,364,828,000
Interest income	348,033,000	$ 321,715,000	$ 306,436,000	$ 297,132,000	301,957,000	$ 296,813,000	$ 288,644,000	$ 251,344,000	1,273,316,000	[1]	1,138,758,000	[1]	$ 934,068,000
Penalties and interest accrued	0				0				0		0
Loans Held for Investment at Fair Value | Seasoned Subprime Residential Mortgage Loans
Investment [Line Items]
Real estate acquired through foreclosure	17,000,000				10,000,000				17,000,000		10,000,000
Non Agency Residential Mortgage Backed Securities Fair Value Option
Investment [Line Items]
Non-Agency RMBS, at fair value	12,000,000				14,000,000				12,000,000		14,000,000
Interest-only | Residential Mortgage-Backed Securities
Investment [Line Items]
Interest income									25,000,000		31,000,000
Non Agency Senior And Subordinated Mortgage Backed Securities Interest Only Available For Sale | Interest-only | Residential Mortgage-Backed Securities
Investment [Line Items]
Non-Agency RMBS, at fair value	267,000,000				219,000,000				267,000,000		219,000,000
Agency MBS - Interest-only | Interest-only | Residential Mortgage-Backed Securities
Investment [Line Items]
Agency MBS, at fair value	$ 133,000,000				$ 104,000,000				$ 133,000,000		$ 104,000,000
[1]	Includes interest income of consolidated VIEs of $904,830, $914,022 and $678,623 for the years ended December 31, 2018, 2017 and 2016 respectively. See Note 8 to consolidated financial statements for further discussion.

Mortgage-Backed Securities - Su

Mortgage-Backed Securities - Summary (Detail) - Residential Mortgage-Backed Securities - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Investment Holdings [Line Items]
Principal or Notional Value	$ 23,577,333	$ 15,442,782
Total Premium	725,412	563,428
Total Discount	(1,296,506)	(1,438,994)
Amortized Cost	14,088,920	6,481,537
Fair Value	14,675,080	7,216,144
Gross Unrealized Gains	816,456	861,182
Gross Unrealized Losses	(230,296)	(126,575)
Net Unrealized Gain/(Loss)	586,160	734,607
Non-Agency RMBS - Senior
Investment Holdings [Line Items]
Principal or Notional Value	2,386,049	2,733,926
Total Premium	537	540
Total Discount	(1,112,368)	(1,257,103)
Amortized Cost	1,274,218	1,477,363
Fair Value	1,943,124	2,231,415
Gross Unrealized Gains	669,356	754,234
Gross Unrealized Losses	(450)	(182)
Net Unrealized Gain/(Loss)	668,906	754,052
Non-Agency RMBS - Senior interest-only
Investment Holdings [Line Items]
Principal or Notional Value	5,667,198	4,862,461
Total Premium	286,942	262,996
Total Discount	0	0
Amortized Cost	286,942	262,996
Fair Value	254,890	210,850
Gross Unrealized Gains	31,123	15,761
Gross Unrealized Losses	(63,175)	(67,907)
Net Unrealized Gain/(Loss)	(32,052)	(52,146)
Non-Agency RMBS - Subordinated
Investment Holdings [Line Items]
Principal or Notional Value	394,037	501,455
Total Premium	8,642	10,571
Total Discount	(179,669)	(177,206)
Amortized Cost	223,010	334,820
Fair Value	276,467	401,225
Gross Unrealized Gains	53,702	66,704
Gross Unrealized Losses	(245)	(299)
Net Unrealized Gain/(Loss)	53,457	66,405
Non-Agency RMBS - Subordinated interest-only
Investment Holdings [Line Items]
Principal or Notional Value	221,549	201,378
Total Premium	9,932	7,369
Total Discount	0	0
Amortized Cost	9,932	7,369
Fair Value	11,649	7,826
Gross Unrealized Gains	2,000	902
Gross Unrealized Losses	(283)	(445)
Net Unrealized Gain/(Loss)	1,717	457
Agency MBS - Residential
Investment Holdings [Line Items]
Principal or Notional Value	8,984,249	2,227,128
Total Premium	221,606	123,245
Total Discount	0	0
Amortized Cost	9,205,855	2,350,373
Fair Value	9,174,382	2,322,180
Gross Unrealized Gains	51,986	5,706
Gross Unrealized Losses	(83,459)	(33,899)
Net Unrealized Gain/(Loss)	(31,473)	(28,193)
Agency MBS - Commercial
Investment Holdings [Line Items]
Principal or Notional Value	2,895,679	1,894,594
Total Premium	61,727	47,430
Total Discount	(4,469)	(4,685)
Amortized Cost	2,952,937	1,937,339
Fair Value	2,881,222	1,938,281
Gross Unrealized Gains	6,303	17,041
Gross Unrealized Losses	(78,018)	(16,099)
Net Unrealized Gain/(Loss)	(71,715)	942
Agency MBS - Interest-only
Investment Holdings [Line Items]
Principal or Notional Value	3,028,572	3,021,840
Total Premium	136,026	111,277
Total Discount	0	0
Amortized Cost	136,026	111,277
Fair Value	133,346	104,367
Gross Unrealized Gains	1,986	834
Gross Unrealized Losses	(4,666)	(7,744)
Net Unrealized Gain/(Loss)	$ (2,680)	$ (6,910)

Mortgage-Backed Securities - Ac

Mortgage-Backed Securities - Accretable Yield (Detail) - Available-for-sale Securities - Non-Agency RMBS Having Deteriorated Credit When Acquired - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	$ 1,303,589	$ 1,550,110
Purchases	43,866	20,962
Yield income earned	(231,205)	(266,214)
Reclassification (to) from non-accretable difference	157,117	18,909
Sales and deconsolidation	(25,058)	(20,178)
Balance at end of period	$ 1,248,309	$ 1,303,589

Mortgage-Backed Securities - No

Mortgage-Backed Securities - Non-Agency Securities Having Deteriorated Credit When Acquired (Detail) - Non-Agency RMBS Having Deteriorated Credit When Acquired - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Outstanding principal balance:
Beginning of period	$ 2,673,350	$ 3,138,265
End of period	2,325,154	2,673,350
Amortized cost:
Beginning of period	1,381,839	1,695,079
End of period	$ 1,158,291	$ 1,381,839

Mortgage-Backed Securities - Un

Mortgage-Backed Securities - Unrealized Loss Positions (Detail) - Residential Mortgage-Backed Securities $ in Thousands	Dec. 31, 2018USD ($)security	Dec. 31, 2017USD ($)security
Estimated Fair Value
Unrealized Loss Position for Less than 12 Months	$ 2,532,390	$ 1,569,727
Unrealized Loss Position for 12 Months or More	2,484,509	1,818,645
Total	5,016,899	3,388,372
Unrealized Losses
Unrealized Loss Position for Less than 12 Months	(67,329)	(19,477)
Unrealized Loss Position for 12 Months or More	(162,967)	(107,098)
Total	$ (230,296)	$ (126,575)
Number of Positions
Unrealized Loss Position for Less than 12 Months | security	605	239
Unrealized Loss Position for 12 Months or More | security	415	336
Total | security	1,020	575
Non-Agency RMBS - Senior
Estimated Fair Value
Unrealized Loss Position for Less than 12 Months	$ 0	$ 35,229
Unrealized Loss Position for 12 Months or More	33,303	0
Total	33,303	35,229
Unrealized Losses
Unrealized Loss Position for Less than 12 Months	0	(182)
Unrealized Loss Position for 12 Months or More	(450)	0
Total	$ (450)	$ (182)
Number of Positions
Unrealized Loss Position for Less than 12 Months | security	0	1
Unrealized Loss Position for 12 Months or More | security	1	0
Total | security	1	1
Non-Agency RMBS - Senior interest-only
Estimated Fair Value
Unrealized Loss Position for Less than 12 Months	$ 34,236	$ 28,129
Unrealized Loss Position for 12 Months or More	95,108	120,120
Total	129,344	148,249
Unrealized Losses
Unrealized Loss Position for Less than 12 Months	(4,276)	(1,724)
Unrealized Loss Position for 12 Months or More	(58,899)	(66,183)
Total	$ (63,175)	$ (67,907)
Number of Positions
Unrealized Loss Position for Less than 12 Months | security	29	27
Unrealized Loss Position for 12 Months or More | security	91	120
Total | security	120	147
Non-Agency RMBS - Subordinated
Estimated Fair Value
Unrealized Loss Position for Less than 12 Months	$ 13,404	$ 235
Unrealized Loss Position for 12 Months or More	0	6,261
Total	13,404	6,496
Unrealized Losses
Unrealized Loss Position for Less than 12 Months	(245)	(38)
Unrealized Loss Position for 12 Months or More	0	(261)
Total	$ (245)	$ (299)
Number of Positions
Unrealized Loss Position for Less than 12 Months | security	7	7
Unrealized Loss Position for 12 Months or More | security	8	5
Total | security	15	12
Non-Agency RMBS - Subordinated interest-only
Estimated Fair Value
Unrealized Loss Position for Less than 12 Months	$ 2,104	$ 0
Unrealized Loss Position for 12 Months or More	303	945
Total	2,407	945
Unrealized Losses
Unrealized Loss Position for Less than 12 Months	(158)	0
Unrealized Loss Position for 12 Months or More	(125)	(445)
Total	$ (283)	$ (445)
Number of Positions
Unrealized Loss Position for Less than 12 Months | security	2	0
Unrealized Loss Position for 12 Months or More | security	1	3
Total | security	3	3
Agency MBS - Residential
Estimated Fair Value
Unrealized Loss Position for Less than 12 Months	$ 779,322	$ 660,103
Unrealized Loss Position for 12 Months or More	1,809,566	1,471,464
Total	2,588,888	2,131,567
Unrealized Losses
Unrealized Loss Position for Less than 12 Months	(6,220)	(5,197)
Unrealized Loss Position for 12 Months or More	(77,239)	(28,702)
Total	$ (83,459)	$ (33,899)
Number of Positions
Unrealized Loss Position for Less than 12 Months | security	17	21
Unrealized Loss Position for 12 Months or More | security	114	93
Total | security	131	114
Agency MBS - Commercial
Estimated Fair Value
Unrealized Loss Position for Less than 12 Months	$ 1,697,555	$ 830,889
Unrealized Loss Position for 12 Months or More	504,570	161,980
Total	2,202,125	992,869
Unrealized Losses
Unrealized Loss Position for Less than 12 Months	(56,382)	(11,695)
Unrealized Loss Position for 12 Months or More	(21,636)	(4,404)
Total	$ (78,018)	$ (16,099)
Number of Positions
Unrealized Loss Position for Less than 12 Months | security	548	176
Unrealized Loss Position for 12 Months or More | security	183	91
Total | security	731	267
Agency MBS - Interest-only
Estimated Fair Value
Unrealized Loss Position for Less than 12 Months	$ 5,769	$ 15,142
Unrealized Loss Position for 12 Months or More	41,659	57,875
Total	47,428	73,017
Unrealized Losses
Unrealized Loss Position for Less than 12 Months	(48)	(641)
Unrealized Loss Position for 12 Months or More	(4,618)	(7,103)
Total	$ (4,666)	$ (7,744)
Number of Positions
Unrealized Loss Position for Less than 12 Months | security	2	7
Unrealized Loss Position for 12 Months or More | security	17	24
Total | security	19	31

Mortgage-Backed Securities - In

Mortgage-Backed Securities - Investment Holdings - Narrative (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Agency RMBS - Pass-through
Investment Holdings [Line Items]
Gross unrealized loss	$ 95,000	$ 41,000
Non-agency MBS
Investment Holdings [Line Items]
Gross unrealized loss	$ 601	$ 283
Non-Agency RMBS Deemed To Be Equivalent To Alt-A Quality
Investment Holdings [Line Items]
Percentage in Alt-A collateral	71.00%	66.00%
Non Agency Residential MBS Deemed To Be Equivalent To Prime Quality
Investment Holdings [Line Items]
Percentage in prime collateral	12.00%	13.00%
Re-REMIC Security
Investment Holdings [Line Items]
Fair value of securities exchanged	$ 81,000	$ 63,000
Gain (loss) on sale of investments	$ 3,000	$ 9,000
Minimum | Alt-A
Investment Holdings [Line Items]
FICO Score	680
Maximum | Alt-A
Investment Holdings [Line Items]
FICO Score	720
Alt-A securities underlying collateral of full documented loans	30.00%

Mortgage-Backed Securities - Ag

Mortgage-Backed Securities - Aggregate Other Than Temporary Impairments (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Total other-than-temporary impairment losses									$ (2,556)	$ (5,169)	$ (9,589)
Portion of loss recognized in other comprehensive income (loss)	$ (4,269)	$ (7,233)	$ (9,131)	$ (1,158)	$ (18,179)	$ (11,468)	$ (13,509)	$ (18,701)	(19,235)	(56,687)	(48,398)
Net other-than-temporary credit impairment losses									(21,791)	(61,856)	(57,987)
Residential Mortgage-Backed Securities
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Total other-than-temporary impairment losses									(2,556)	(5,169)	(9,589)
Portion of loss recognized in other comprehensive income (loss)									(19,235)	(56,687)	(48,398)
Net other-than-temporary credit impairment losses									$ (21,791)	$ (61,856)	$ (57,987)

Mortgage-Backed Securities - _2

Mortgage-Backed Securities - Non-Agency Securities Credit Losses (Detail) - Non-agency MBS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Cumulative credit loss beginning balance	$ 591,521	$ 556,485	$ 529,112
Additions:
Other-than-temporary impairments not previously recognized	9,379	12,669	25,959
Reductions for securities sold or deconsolidated during the period	(9,169)	(12,405)	(9,429)
Increases related to other-than-temporary impairments on securities with previously recognized other-than-temporary impairments	12,412	47,211	32,027
Reductions for increases in cash flows expected to be collected over the remaining life of the securities	(16,944)	(12,439)	(21,184)
Cumulative credit impairment loss ending balance	$ 587,199	$ 591,521	$ 556,485

Mortgage-Backed Securities - OT

Mortgage-Backed Securities - OTTI - Significant Inputs and Assumptions (Detail) - Non-agency MBS	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Weighted Average
Investment Holdings [Line Items]
Loss Severity	59.00%	64.00%
60 days delinquent	13.00%	21.00%
Credit Enhancement	14.00%	16.00%
3 Month CPR	10.00%	10.00%
12 Month CPR	11.00%	11.00%
Minimum
Investment Holdings [Line Items]
Loss Severity	5.00%	28.00%
60 days delinquent	0.00%	11.00%
Credit Enhancement	0.00%	0.00%
3 Month CPR	0.00%	0.00%
12 Month CPR	1.00%	1.00%
Maximum
Investment Holdings [Line Items]
Loss Severity	132.00%	89.00%
60 days delinquent	30.00%	27.00%
Credit Enhancement	55.00%	50.00%
3 Month CPR	39.00%	24.00%
12 Month CPR	28.00%	19.00%

Mortgage-Backed Securities - Gr

Mortgage-Backed Securities - Gross Unrealized Gains (Losses) (Detail) - Residential Mortgage-Backed Securities - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Investment Holdings [Line Items]
Gross Unrealized Gain Included in Accumulated Other Comprehensive Income	$ 722,110	$ 838,391
Gross Unrealized Gain Included in Cumulative Earnings	94,346	22,791
Total Gross Unrealized Gain	816,456	861,182
Gross Unrealized Loss Included in Accumulated Other Comprehensive Income	(95,278)	(41,489)
Gross Unrealized Loss Included in Cumulative Earnings	(135,018)	(85,086)
Total Gross Unrealized Loss	(230,296)	(126,575)
Non-Agency RMBS - Senior
Investment Holdings [Line Items]
Gross Unrealized Gain Included in Accumulated Other Comprehensive Income	669,356	754,234
Gross Unrealized Gain Included in Cumulative Earnings	0	0
Total Gross Unrealized Gain	669,356	754,234
Gross Unrealized Loss Included in Accumulated Other Comprehensive Income	(450)	(182)
Gross Unrealized Loss Included in Cumulative Earnings	0	0
Total Gross Unrealized Loss	(450)	(182)
Non-Agency RMBS - Senior interest-only
Investment Holdings [Line Items]
Gross Unrealized Gain Included in Accumulated Other Comprehensive Income	0	0
Gross Unrealized Gain Included in Cumulative Earnings	31,123	15,761
Total Gross Unrealized Gain	31,123	15,761
Gross Unrealized Loss Included in Accumulated Other Comprehensive Income	0	0
Gross Unrealized Loss Included in Cumulative Earnings	(63,175)	(67,907)
Total Gross Unrealized Loss	(63,175)	(67,907)
Non-Agency RMBS - Subordinated
Investment Holdings [Line Items]
Gross Unrealized Gain Included in Accumulated Other Comprehensive Income	50,235	62,989
Gross Unrealized Gain Included in Cumulative Earnings	3,467	3,715
Total Gross Unrealized Gain	53,702	66,704
Gross Unrealized Loss Included in Accumulated Other Comprehensive Income	(151)	(102)
Gross Unrealized Loss Included in Cumulative Earnings	(94)	(197)
Total Gross Unrealized Loss	(245)	(299)
Non-Agency RMBS - Subordinated interest-only
Investment Holdings [Line Items]
Gross Unrealized Gain Included in Accumulated Other Comprehensive Income	0	0
Gross Unrealized Gain Included in Cumulative Earnings	2,000	902
Total Gross Unrealized Gain	2,000	902
Gross Unrealized Loss Included in Accumulated Other Comprehensive Income	0	0
Gross Unrealized Loss Included in Cumulative Earnings	(283)	(445)
Total Gross Unrealized Loss	(283)	(445)
Agency MBS - Residential
Investment Holdings [Line Items]
Gross Unrealized Gain Included in Accumulated Other Comprehensive Income	1,708	5,706
Gross Unrealized Gain Included in Cumulative Earnings	50,278	0
Total Gross Unrealized Gain	51,986	5,706
Gross Unrealized Loss Included in Accumulated Other Comprehensive Income	(59,552)	(29,083)
Gross Unrealized Loss Included in Cumulative Earnings	(23,907)	(4,816)
Total Gross Unrealized Loss	(83,459)	(33,899)
Agency MBS - Commercial
Investment Holdings [Line Items]
Gross Unrealized Gain Included in Accumulated Other Comprehensive Income	811	15,462
Gross Unrealized Gain Included in Cumulative Earnings	5,492	1,579
Total Gross Unrealized Gain	6,303	17,041
Gross Unrealized Loss Included in Accumulated Other Comprehensive Income	(35,125)	(12,122)
Gross Unrealized Loss Included in Cumulative Earnings	(42,893)	(3,977)
Total Gross Unrealized Loss	(78,018)	(16,099)
Agency MBS - Interest-only
Investment Holdings [Line Items]
Gross Unrealized Gain Included in Accumulated Other Comprehensive Income	0	0
Gross Unrealized Gain Included in Cumulative Earnings	1,986	834
Total Gross Unrealized Gain	1,986	834
Gross Unrealized Loss Included in Accumulated Other Comprehensive Income	0	0
Gross Unrealized Loss Included in Cumulative Earnings	(4,666)	(7,744)
Total Gross Unrealized Loss	$ (4,666)	$ (7,744)

Mortgage-Backed Securities - Co

Mortgage-Backed Securities - Collateral Characteristics (Detail) - Residential Mortgage-Backed Securities $ in Thousands	Dec. 31, 2018USD ($)$ / security	Dec. 31, 2017USD ($)$ / security
Investment Holdings [Line Items]
Principal or Notional Value at Period-End (dollars in thousands) | $	$ 23,577,333	$ 15,442,782
Non-Agency RMBS - Senior
Investment Holdings [Line Items]
Principal or Notional Value at Period-End (dollars in thousands) | $	$ 2,386,049	$ 2,733,926
Weighted Average Amortized Cost Basis	53.40	54.04
Weighted Average Fair Value	81.44	81.62
Weighted Average Coupon	5.00%	4.60%
Weighted Average Yield at Period-End	19.50%	16.70%
Non-Agency RMBS - Senior interest-only
Investment Holdings [Line Items]
Principal or Notional Value at Period-End (dollars in thousands) | $	$ 5,667,198	$ 4,862,461
Weighted Average Amortized Cost Basis	5.06	5.41
Weighted Average Fair Value	4.50	4.34
Weighted Average Coupon	1.20%	1.30%
Weighted Average Yield at Period-End	8.40%	8.00%
Non-Agency RMBS - Subordinated
Investment Holdings [Line Items]
Principal or Notional Value at Period-End (dollars in thousands) | $	$ 394,037	$ 501,455
Weighted Average Amortized Cost Basis	56.60	66.77
Weighted Average Fair Value	70.16	80.01
Weighted Average Coupon	4.00%	4.10%
Weighted Average Yield at Period-End	9.90%	9.60%
Non-Agency RMBS - Subordinated interest-only
Investment Holdings [Line Items]
Principal or Notional Value at Period-End (dollars in thousands) | $	$ 221,549	$ 201,378
Weighted Average Amortized Cost Basis	4.48	3.66
Weighted Average Fair Value	5.26	3.89
Weighted Average Coupon	1.10%	0.80%
Weighted Average Yield at Period-End	16.40%	11.80%
Agency MBS - Residential
Investment Holdings [Line Items]
Principal or Notional Value at Period-End (dollars in thousands) | $	$ 8,984,249	$ 2,227,128
Weighted Average Amortized Cost Basis	102.47	105.53
Weighted Average Fair Value	102.12	104.27
Weighted Average Coupon	4.00%	3.80%
Weighted Average Yield at Period-End	3.60%	2.90%
Agency MBS - Commercial
Investment Holdings [Line Items]
Principal or Notional Value at Period-End (dollars in thousands) | $	$ 2,895,679	$ 1,894,594
Weighted Average Amortized Cost Basis	101.98	102.26
Weighted Average Fair Value	99.50	102.31
Weighted Average Coupon	3.60%	3.60%
Weighted Average Yield at Period-End	3.40%	3.20%
Agency MBS - Interest-only
Investment Holdings [Line Items]
Principal or Notional Value at Period-End (dollars in thousands) | $	$ 3,028,572	$ 3,021,840
Weighted Average Amortized Cost Basis	4.49	3.68
Weighted Average Fair Value	4.40	3.45
Weighted Average Coupon	0.80%	0.70%
Weighted Average Yield at Period-End	4.30%	3.40%

Mortgage-Backed Securities - Cr

Mortgage-Backed Securities - Credit Ratings (Detail) - Non-agency MBS	Dec. 31, 2018	Dec. 31, 2017
Credit Derivatives [Line Items]
Percentage of RMBS portfolio at fair value, by credit rating	100.00%	100.00%
AAA
Credit Derivatives [Line Items]
Percentage of RMBS portfolio at fair value, by credit rating	0.50%	0.00%
AA
Credit Derivatives [Line Items]
Percentage of RMBS portfolio at fair value, by credit rating	0.10%	0.00%
A
Credit Derivatives [Line Items]
Percentage of RMBS portfolio at fair value, by credit rating	0.30%	0.00%
BBB
Credit Derivatives [Line Items]
Percentage of RMBS portfolio at fair value, by credit rating	0.40%	0.50%
BB
Credit Derivatives [Line Items]
Percentage of RMBS portfolio at fair value, by credit rating	3.60%	0.70%
B
Credit Derivatives [Line Items]
Percentage of RMBS portfolio at fair value, by credit rating	1.10%	0.60%
Below B or not rated
Credit Derivatives [Line Items]
Percentage of RMBS portfolio at fair value, by credit rating	94.00%	98.20%

Mortgage-Backed Securities - Ma

Mortgage-Backed Securities - Maturities (Detail) - Residential Mortgage-Backed Securities - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair value
Less than one year, at fair value	$ 74,475	$ 2,198
Greater than one year and less than five years, at fair value	1,140,839	959,890
Greater than five years and less than ten years, at fair value	9,667,509	3,447,385
Greater than ten years, at fair value	3,792,257	2,806,671
Total maturities, at fair value	14,675,080	7,216,144
Amortized cost
Less than one year, at amortized cost	73,957	3,395
Greater than one year and less than five years, at amortized cost	1,067,871	784,660
Greater than five years and less than ten years, at amortized cost	9,329,097	3,128,723
Greater than ten years, at amortized cost	3,617,995	2,564,759
Amortized Cost	14,088,920	6,481,537
Non-Agency RMBS - Senior
Fair value
Less than one year, at fair value	7,611	2,179
Greater than one year and less than five years, at fair value	357,543	681,086
Greater than five years and less than ten years, at fair value	946,536	910,234
Greater than ten years, at fair value	631,434	637,916
Total maturities, at fair value	1,943,124	2,231,415
Amortized cost
Less than one year, at amortized cost	7,522	2,124
Greater than one year and less than five years, at amortized cost	277,025	493,965
Greater than five years and less than ten years, at amortized cost	585,187	569,458
Greater than ten years, at amortized cost	404,484	411,816
Amortized Cost	1,274,218	1,477,363
Non-Agency RMBS - Senior interest-only
Fair value
Less than one year, at fair value	1,189	19
Greater than one year and less than five years, at fair value	38,407	54,107
Greater than five years and less than ten years, at fair value	96,401	72,702
Greater than ten years, at fair value	118,893	84,022
Total maturities, at fair value	254,890	210,850
Amortized cost
Less than one year, at amortized cost	2,250	1,271
Greater than one year and less than five years, at amortized cost	46,944	73,758
Greater than five years and less than ten years, at amortized cost	111,538	94,145
Greater than ten years, at amortized cost	126,210	93,822
Amortized Cost	286,942	262,996
Non-Agency RMBS - Subordinated
Fair value
Less than one year, at fair value	0	0
Greater than one year and less than five years, at fair value	39,825	75,495
Greater than five years and less than ten years, at fair value	43,744	121,555
Greater than ten years, at fair value	192,898	204,175
Total maturities, at fair value	276,467	401,225
Amortized cost
Less than one year, at amortized cost	0	0
Greater than one year and less than five years, at amortized cost	29,487	61,987
Greater than five years and less than ten years, at amortized cost	26,036	91,044
Greater than ten years, at amortized cost	167,487	181,789
Amortized Cost	223,010	334,820
Non-Agency RMBS - Subordinated interest-only
Fair value
Less than one year, at fair value	0	0
Greater than one year and less than five years, at fair value	303	7,165
Greater than five years and less than ten years, at fair value	9,321	661
Greater than ten years, at fair value	2,025	0
Total maturities, at fair value	11,649	7,826
Amortized cost
Less than one year, at amortized cost	0	0
Greater than one year and less than five years, at amortized cost	428	6,355
Greater than five years and less than ten years, at amortized cost	7,358	1,014
Greater than ten years, at amortized cost	2,146	0
Amortized Cost	9,932	7,369
Agency MBS - Residential
Fair value
Less than one year, at fair value	0	0
Greater than one year and less than five years, at fair value	640,713	21,777
Greater than five years and less than ten years, at fair value	8,524,211	2,300,403
Greater than ten years, at fair value	9,458	0
Total maturities, at fair value	9,174,382	2,322,180
Amortized cost
Less than one year, at amortized cost	0	0
Greater than one year and less than five years, at amortized cost	645,368	22,069
Greater than five years and less than ten years, at amortized cost	8,550,766	2,328,304
Greater than ten years, at amortized cost	9,721	0
Amortized Cost	9,205,855	2,350,373
Agency MBS - Commercial
Fair value
Less than one year, at fair value	0	0
Greater than one year and less than five years, at fair value	15,468	45,770
Greater than five years and less than ten years, at fair value	28,205	16,559
Greater than ten years, at fair value	2,837,549	1,875,952
Total maturities, at fair value	2,881,222	1,938,281
Amortized cost
Less than one year, at amortized cost	0	0
Greater than one year and less than five years, at amortized cost	15,543	47,170
Greater than five years and less than ten years, at amortized cost	29,447	17,176
Greater than ten years, at amortized cost	2,907,947	1,872,993
Amortized Cost	2,952,937	1,937,339
Agency MBS - Interest-only
Fair value
Less than one year, at fair value	65,675	0
Greater than one year and less than five years, at fair value	48,580	74,490
Greater than five years and less than ten years, at fair value	19,091	25,271
Greater than ten years, at fair value	0	4,606
Total maturities, at fair value	133,346	104,367
Amortized cost
Less than one year, at amortized cost	64,185	0
Greater than one year and less than five years, at amortized cost	53,076	79,356
Greater than five years and less than ten years, at amortized cost	18,765	27,582
Greater than ten years, at amortized cost	0	4,339
Amortized Cost	$ 136,026	$ 111,277

Mortgage-Backed Securities - Ge

Mortgage-Backed Securities - Geographical and Other Statistics (Detail) - Non-agency MBS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Investment Holdings [Line Items]
Weighted average maturity (years)	21 years 3 months 24 days	20 years 8 months 12 days
Weighted average amortized loan to value	62.90%	64.40%
Weighted average FICO	708	697
Weighted average loan balance (in thousands)	$ 308	$ 314
Weighted average percentage owner occupied	85.70%	84.40%
Weighted average percentage single family residence	63.80%	66.30%
Weighted average current credit enhancement	1.40%	2.20%
CA
Investment Holdings [Line Items]
Weighted average geographic concentration of top four states	33.80%	31.70%
NY
Investment Holdings [Line Items]
Weighted average geographic concentration of top four states	7.40%	8.50%
FL
Investment Holdings [Line Items]
Weighted average geographic concentration of top four states	7.70%	8.30%
NJ
Investment Holdings [Line Items]
Weighted average geographic concentration of top four states	2.10%	2.70%

Mortgage-Backed Securities - Ye

Mortgage-Backed Securities - Year Originated (Detail) - Non-agency MBS	Dec. 31, 2018	Dec. 31, 2017
Origination Year as a Percentage of Outstanding Principal Balance:
2003 (and prior)	1.30%	1.60%
2,004	1.70%	0.90%
2,005	12.90%	12.50%
2,006	49.80%	46.40%
2,007	31.00%	36.50%
2008 and later	3.30%	2.10%
Total	100.00%	100.00%

Mortgage-Backed Securities - Ga

Mortgage-Backed Securities - Gains and Losses from Sales of Investments (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investment Holdings [Line Items]
Net realized gain (loss)	$ 1,213	$ (6,123)	$ 2,167	$ 0	$ (586)	$ 1	$ 4,541	$ 5,167	$ (2,743)	$ 9,123	$ 18,155
Residential Mortgage-Backed Securities
Investment Holdings [Line Items]
Proceeds from sales									116,975	812,005	2,719,329
Gross realized gains									7,547	17,538	28,572
Gross realized losses									(10,391)	(8,415)	(10,417)
Net realized gain (loss)									$ (2,844)	$ 9,123	$ 18,155

Loans Held for Investment - Nar

Loans Held for Investment - Narrative (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Securitized debt loans held for investment at cost	$ 12,200,000,000	$ 13,300,000,000
90 and over days delinquent	795,504,000	752,967,000
Fair Value | Seasoned Subprime Residential Mortgage Loans
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
90 and over days delinquent	606,000,000	577,000,000
Loans Held for Investment at Fair Value
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Purchases	415,000,000
Retained balance	40,000,000
Realized gains (losses) on sales and settlements	0
Loans Held for Investment at Fair Value | Seasoned Subprime Residential Mortgage Loans
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Loans in foreclosure proceedings	292,000,000	200,000,000
Loans subject to bankruptcy protection	266,000,000	273,000,000
Real estate acquired, loan value	$ 47,000,000	$ 31,000,000

Loans Held for Investment - Rol

Loans Held for Investment - Roll-Forward (Detail) - Variable Interest Entities, Primary Beneficiary, Aggregated Disclosure - Loans Held for Investment at Fair Value - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance, beginning of period	$ 13,678,263	$ 8,753,653
Purchases	1,671,330	6,539,765
Principal paydowns	(1,859,155)	(1,788,409)
Sales and settlements	(807,364)	2,876
Net periodic accretion (amortization)	(83,393)	(35,803)
Realized gains (losses) on sales and settlements	101	0
Change in fair value	(27,201)	206,181
Balance, end of period	$ 12,572,581	$ 13,678,263

Loans Held for Investment - Yea

Loans Held for Investment - Year Originated (Detail) - Loans Held for Investment at Fair Value - Seasoned Subprime Residential Mortgage Loans	Dec. 31, 2018	Dec. 31, 2017
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
2002 and prior	7.30%	7.50%
2,003	6.60%	6.70%
2,004	13.60%	14.60%
2,005	19.50%	20.40%
2,006	22.70%	23.10%
2,007	19.50%	19.00%
2,008	6.20%	6.00%
2,009	1.00%	0.70%
2010 and later	3.60%	2.00%
Total	100.00%	100.00%

Loans Held for Investment - Col

Loans Held for Investment - Collateral Characteristics (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)loan	Dec. 31, 2017USD ($)loan
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Number of loans	140,345	149,172
Loans Held for Investment at Fair Value | Seasoned Subprime Residential Mortgage Loans
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Number of loans	140,345	149,172
Weighted average maturity (years)	18 years 7 months 24 days	18 years 9 months 18 days
Weighted average loan to value	87.50%	88.00%
Weighted average FICO	629	631
Weighted average loan balance (in thousands) | $	$ 89	$ 91
Weighted average percentage owner occupied	90.10%	95.00%
Weighted average percentage single family residence	86.30%	86.00%
Loans Held for Investment at Fair Value | CA | Seasoned Subprime Residential Mortgage Loans
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Weighted average geographic concentration of top four states	9.00%	9.00%
Loans Held for Investment at Fair Value | FL | Seasoned Subprime Residential Mortgage Loans
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Weighted average geographic concentration of top four states	7.30%	7.20%
Loans Held for Investment at Fair Value | OH | Seasoned Subprime Residential Mortgage Loans
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Weighted average geographic concentration of top four states	5.90%	6.10%
Loans Held for Investment at Fair Value | NY | Seasoned Subprime Residential Mortgage Loans
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Weighted average geographic concentration of top four states	5.70%
Loans Held for Investment at Fair Value | PA | Seasoned Subprime Residential Mortgage Loans
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Weighted average geographic concentration of top four states	5.60%	5.60%
Loans Held for Investment at Fair Value | VA | Seasoned Subprime Residential Mortgage Loans
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Weighted average geographic concentration of top four states		5.50%

Loans Held for Investment - Loa

Loans Held for Investment - Loan Products Type and Characteristics (Details) $ in Thousands	Dec. 31, 2018USD ($)loan	Dec. 31, 2017USD ($)loan
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Number of loans | loan	140,345	149,172
Total Principal	$ 12,432,581	$ 13,525,820
30-89 Days Delinquent	1,171,771	1,286,215
90 Days Delinquent	$ 795,504	$ 752,967
Adjustable Rate Loans
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Number of loans | loan	8,793	9,840
Total Principal	$ 918,610	$ 1,058,863
30-89 Days Delinquent	102,266	121,744
90 Days Delinquent	$ 62,940	$ 61,744
Adjustable Rate Loans | $1 to $250
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Number of loans | loan	8,258	9,227
Total Principal	$ 713,392	$ 827,020
30-89 Days Delinquent	80,781	95,952
90 Days Delinquent	$ 48,235	$ 46,343
Adjustable Rate Loans | $250 to $500
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Number of loans | loan	456	529
Total Principal	$ 148,867	$ 171,266
30-89 Days Delinquent	17,722	19,289
90 Days Delinquent	$ 10,779	$ 11,855
Adjustable Rate Loans | $500 to $750
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Number of loans | loan	65	67
Total Principal	$ 38,148	$ 39,212
30-89 Days Delinquent	2,979	3,041
90 Days Delinquent	$ 2,762	$ 2,382
Adjustable Rate Loans | $750 to $1,000
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Number of loans | loan	7	9
Total Principal	$ 6,008	$ 7,663
30-89 Days Delinquent	784	757
90 Days Delinquent	$ 0	$ 0
Adjustable Rate Loans | Over $1,000
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Number of loans | loan	7	8
Total Principal	$ 12,195	$ 13,702
30-89 Days Delinquent	0	2,705
90 Days Delinquent	$ 1,164	$ 1,164
Fixed Rate Loans
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Number of loans | loan	131,552	139,331
Total Principal	$ 11,513,971	$ 12,466,255
30-89 Days Delinquent	1,069,505	1,164,471
90 Days Delinquent	$ 732,564	$ 691,223
Fixed Rate Loans | $1 to $250
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Number of loans | loan	126,085	133,437
Total Principal	$ 9,566,517	$ 10,371,829
30-89 Days Delinquent	894,574	960,564
90 Days Delinquent	$ 591,283	$ 562,271
Fixed Rate Loans | $250 to $500
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Number of loans | loan	4,942	5,324
Total Principal	$ 1,595,673	$ 1,713,839
30-89 Days Delinquent	160,015	188,257
90 Days Delinquent	$ 128,876	$ 114,616
Fixed Rate Loans | $500 to $750
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Number of loans | loan	406	440
Total Principal	$ 238,292	$ 258,058
30-89 Days Delinquent	12,239	12,789
90 Days Delinquent	$ 10,600	$ 13,459
Fixed Rate Loans | $750 to $1,000
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Number of loans | loan	88	99
Total Principal	$ 75,289	$ 84,701
30-89 Days Delinquent	2,677	1,706
90 Days Delinquent	$ 1,805	$ 877
Fixed Rate Loans | Over $1,000
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Number of loans | loan	31	31
Total Principal	$ 38,200	$ 37,828
30-89 Days Delinquent	0	1,155
90 Days Delinquent	$ 0	$ 0
Hybrid Loans
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Number of loans | loan		1
Total Principal		$ 702
30-89 Days Delinquent		0
90 Days Delinquent		$ 0
Hybrid Loans | $500 to $750
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Number of loans | loan		1
Total Principal		$ 702
30-89 Days Delinquent		0
90 Days Delinquent		$ 0
Minimum | Adjustable Rate Loans | $1 to $250
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Interest Rate	1.00%	1.00%
Minimum | Adjustable Rate Loans | $250 to $500
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Interest Rate	2.00%	2.00%
Minimum | Adjustable Rate Loans | $500 to $750
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Interest Rate	2.00%	2.00%
Minimum | Adjustable Rate Loans | $750 to $1,000
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Interest Rate	4.13%	3.88%
Minimum | Adjustable Rate Loans | Over $1,000
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Interest Rate	4.00%	3.88%
Minimum | Fixed Rate Loans | $1 to $250
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Interest Rate	0.00%	0.00%
Minimum | Fixed Rate Loans | $250 to $500
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Interest Rate	0.00%	0.00%
Minimum | Fixed Rate Loans | $500 to $750
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Interest Rate	2.00%	2.00%
Minimum | Fixed Rate Loans | $750 to $1,000
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Interest Rate	2.00%	2.00%
Minimum | Fixed Rate Loans | Over $1,000
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Interest Rate	3.00%	3.00%
Minimum | Hybrid Loans | $500 to $750
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Interest Rate		6.88%
Maximum | Adjustable Rate Loans | $1 to $250
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Interest Rate	19.49%	18.74%
Maximum | Adjustable Rate Loans | $250 to $500
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Interest Rate	12.75%	11.88%
Maximum | Adjustable Rate Loans | $500 to $750
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Interest Rate	10.00%	9.25%
Maximum | Adjustable Rate Loans | $750 to $1,000
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Interest Rate	5.13%	5.55%
Maximum | Adjustable Rate Loans | Over $1,000
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Interest Rate	5.00%	4.00%
Maximum | Fixed Rate Loans | $1 to $250
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Interest Rate	24.00%	24.00%
Maximum | Fixed Rate Loans | $250 to $500
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Interest Rate	12.52%	12.52%
Maximum | Fixed Rate Loans | $500 to $750
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Interest Rate	10.69%	10.69%
Maximum | Fixed Rate Loans | $750 to $1,000
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Interest Rate	7.98%	7.69%
Maximum | Fixed Rate Loans | Over $1,000
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Interest Rate	6.38%	5.75%
Maximum | Hybrid Loans | $500 to $750
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Interest Rate		6.88%

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Details)	12 Months Ended
	Dec. 31, 2018USD ($)loan	Dec. 31, 2017USD ($)loan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of loans | loan	140,345	149,172
Transfers in to Level 3	$ 0
Transfers out of Level 3 assets	$ 0	$ 0
Investments with Difference Between Model Price and Third-Party Price | Mortgage Backed Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans internally valued lower than third party prices | loan	19	4
Excess (deficit) of third party prices over internally developed price	$ 4,000,000	$ (3,000,000)
Investments with Difference Between Model Price and Third-Party Price | Securitized Loans Held For Investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Excess (deficit) of third party prices over internally developed price	3,000,000
Internal Assessment | Investments with Difference Between Model Price and Third-Party Price | Mortgage Backed Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	127,000,000	25,000,000
Internal Assessment | Investments with Difference Between Model Price and Third-Party Price | Securitized Loans Held For Investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	$ 489,000,000	0
Number of loans	0
Third Party Assessment | Investments with Difference Between Model Price and Third-Party Price | Mortgage Backed Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	$ 123,000,000	$ 28,000,000
Third Party Assessment | Investments with Difference Between Model Price and Third-Party Price | Securitized Loans Held For Investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Excess (deficit) of third party prices over internally developed price	$ 486,000,000

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Unpaid Principal, Fair Value and Impact of Changes in Fair Value on Financial Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Assets:
Loans held for investment, at fair value	$ 12,572,581	$ 13,678,263
Liabilities:
Securitized debt at fair value, collateralized by loans held for investment, fair value	8,455,376	9,388,657
Non-agency RMBS | Subordinated
Assets:
Fair Value	12,014	13,993
Gain (Loss) on Change in Fair Value	(145)	1,246
Non-agency RMBS | Senior, interest-only
Assets:
Unpaid Principal/ Notional	5,667,198	4,862,461
Fair Value	254,890	210,850
Gain (Loss) on Change in Fair Value	20,095	(13,290)
Non-agency RMBS | Subordinated, interest-only
Assets:
Unpaid Principal/ Notional	221,549	201,378
Fair Value	11,649	7,826
Gain (Loss) on Change in Fair Value	1,261	2,311
Agency MBS | Residential Pass-through
Assets:
Unpaid Principal/ Notional	7,573,835	577,522
Fair Value	7,739,382	602,829
Gain (Loss) on Change in Fair Value	31,185	(4,816)
Agency MBS | Commercial Pass-through
Assets:
Unpaid Principal/ Notional	1,607,626	564,379
Fair Value	1,595,681	570,105
Gain (Loss) on Change in Fair Value	(35,002)	(2,398)
Agency MBS | Interest-only
Assets:
Unpaid Principal/ Notional	3,028,572	3,021,840
Fair Value	133,346	104,367
Gain (Loss) on Change in Fair Value	4,230	465
Loans held for investment
Assets:
Gain (Loss) on Change in Fair Value	(27,201)	206,181
Loans held for investment, Unpaid Principal/Notional	12,432,582	13,525,820
Loans held for investment, at fair value	12,572,581	13,678,263
Securitized debt
Assets:
Gain (Loss) on Change in Fair Value	52,209	(78,289)
Liabilities:
Securitized debt at fair value, collateralized by loans held for investment, Unpaid Principal/Notional	8,561,319	9,395,854
Securitized debt at fair value, collateralized by loans held for investment, fair value	$ 8,455,376	$ 9,388,657

Fair Value Measurements - Level

Fair Value Measurements - Level of Fair Value (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets:
Non-Agency RMBS, at fair value	$ 2,486,130	$ 2,851,316
Agency MBS, at fair value	12,188,950	4,364,828
Loans held for investment, at fair value	12,572,581	13,678,263
Net Amounts Offset in the Consolidated Statements of Financial Position	37,468	48,914
Liabilities:
Securitized debt at fair value, collateralized by loans held for investment	8,455,376	9,388,657
Net Amounts Offset in the Consolidated Statements of Financial Position	0	320
Fair Value, Measurements, Recurring
Assets:
Non-Agency RMBS, at fair value	2,486,130	2,851,316
Agency MBS, at fair value	12,188,950	4,364,828
Loans held for investment, at fair value	12,572,581	13,678,263
Counterparty and Cash Collateral, netting	(51,653)	(1,617)
Net Amounts Offset in the Consolidated Statements of Financial Position	37,468	48,914
Liabilities:
Securitized debt at fair value, collateralized by loans held for investment	8,455,376	9,388,657
Counterparty and Cash Collateral, netting	(183,165)	(1,617)
Net Amounts Offset in the Consolidated Statements of Financial Position	0	320
Fair Value, Measurements, Recurring | Level 1
Assets:
Non-Agency RMBS, at fair value	0	0
Agency MBS, at fair value	0	0
Loans held for investment, at fair value	0	0
Derivatives	0	3,553
Liabilities:
Securitized debt at fair value, collateralized by loans held for investment	0	0
Derivatives	13,375	0
Fair Value, Measurements, Recurring | Level 2
Assets:
Non-Agency RMBS, at fair value	0	0
Agency MBS, at fair value	12,188,950	4,364,828
Loans held for investment, at fair value	0	0
Derivatives	89,121	46,978
Liabilities:
Securitized debt at fair value, collateralized by loans held for investment	0	0
Derivatives	169,790	1,937
Fair Value, Measurements, Recurring | Level 3
Assets:
Non-Agency RMBS, at fair value	2,486,130	2,851,316
Agency MBS, at fair value	0	0
Loans held for investment, at fair value	12,572,581	13,678,263
Derivatives	0	0
Liabilities:
Securitized debt at fair value, collateralized by loans held for investment	8,455,376	9,388,657
Derivatives	$ 0	$ 0

Fair Value Measurements - Unobs

Fair Value Measurements - Unobservable Input Reconciliation (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets Measured on Recurring Basis [Roll Forward]
Transfers in to Level 3	$ 0
Transfers out of Level 3	0	$ 0
Securitized Debt | Variable Interest Entities, Primary Beneficiary, Aggregated Disclosure
Fair Value, Assets Measured on Recurring Basis [Roll Forward]
Other than temporary credit impairment losses	0	0
Realized gains (losses) on sales and settlements	(26,375,000)	35,273,000
Net unrealized gains (losses) included in income	(52,209,000)	78,289,000
Fair Value, Liabilities Measured on Recurring Basis [Roll Forward]
Securitized Debt, Beginning balance, Level 3	9,388,657,000	6,941,097,000
Securitized Debt, Transfers in to Level 3 assets	0	0
Securitized Debt, Transfers out of Level 3 assets	0	0
Securitized Debt, Purchases	1,769,539,000	5,173,430,000
Securitized Debt, Principal payments	(1,778,625,000)	(1,787,368,000)
Securitized Debt, Sales and Settlements	(834,414,000)	(1,056,765,000)
Securitized Debt, Net accretion (amortization)	(11,197,000)	4,701,000
Securitized Debt, Gains (losses) included in other comprehensive income	0	0
Securitized Debt, Ending balance, Level 3	8,455,376,000	9,388,657,000
Non-agency MBS
Fair Value, Assets Measured on Recurring Basis [Roll Forward]
Beginning balance Level 3	2,851,316,000	3,330,063,000
Transfers in to Level 3	0	6,112,000
Transfers out of Level 3	0	0
Purchases of assets/ issuance of debt	253,952,000	78,400,000
Principal payments	(521,109,000)	(568,339,000)
Sales and settlements	(100,786,000)	(68,162,000)
Net accretion (amortization)	101,088,000	120,119,000
Other than temporary credit impairment losses	(21,791,000)	(59,881,000)
Realized gains (losses) on sales and settlements	201,000	12,031,000
Net unrealized gains (losses) included in income	21,208,000	(9,733,000)
Total unrealized gains (losses) for the period	(97,949,000)	10,706,000
Ending balance Level 3	2,486,130,000	2,851,316,000
Loans held for investment | Variable Interest Entities, Primary Beneficiary, Aggregated Disclosure
Fair Value, Assets Measured on Recurring Basis [Roll Forward]
Beginning balance Level 3	13,678,263,000	8,753,653,000
Transfers in to Level 3	0	0
Transfers out of Level 3	0	0
Purchases of assets/ issuance of debt	1,671,330,000	6,539,765,000
Principal payments	(1,859,155,000)	(1,788,409,000)
Sales and settlements	(807,364,000)	2,876,000
Net accretion (amortization)	(83,393,000)	(35,803,000)
Other than temporary credit impairment losses	0	0
Realized gains (losses) on sales and settlements	101,000	0
Net unrealized gains (losses) included in income	(27,201,000)	206,181,000
Total unrealized gains (losses) for the period	0	0
Ending balance Level 3	$ 12,572,581,000	$ 13,678,263,000

Fair Value Measurements - Uno_2

Fair Value Measurements - Unobservable Inputs Assumptions - Non-Agency RMBS Held for Investment (Detail) - Level 3	Dec. 31, 2018	Dec. 31, 2017
Weighted Average Discount Rate | Non-Agency RMBS - Senior
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.045	0.044
Weighted Average Discount Rate | Non-Agency RMBS - Senior interest-only
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.111	0.112
Weighted Average Discount Rate | Non-Agency RMBS - Subordinated
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.058	0.058
Weighted Average Discount Rate | Non-Agency RMBS - Subordinated interest-only
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.120	0.120
CPR | Minimum | Non-Agency RMBS - Senior
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.01	0.01
CPR | Minimum | Non-Agency RMBS - Senior interest-only
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.03	0.03
CPR | Minimum | Non-Agency RMBS - Subordinated
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.01	0.01
CPR | Minimum | Non-Agency RMBS - Subordinated interest-only
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.04	0.06
CPR | Maximum | Non-Agency RMBS - Senior
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.25	0.45
CPR | Maximum | Non-Agency RMBS - Senior interest-only
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.32	0.25
CPR | Maximum | Non-Agency RMBS - Subordinated
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.19	0.20
CPR | Maximum | Non-Agency RMBS - Subordinated interest-only
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.25	0.22
CDR | Minimum | Non-Agency RMBS - Senior
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0	0
CDR | Minimum | Non-Agency RMBS - Senior interest-only
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0	0
CDR | Minimum | Non-Agency RMBS - Subordinated
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0	0
CDR | Minimum | Non-Agency RMBS - Subordinated interest-only
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0	0
CDR | Maximum | Non-Agency RMBS - Senior
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.60	0.55
CDR | Maximum | Non-Agency RMBS - Senior interest-only
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.60	0.50
CDR | Maximum | Non-Agency RMBS - Subordinated
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.34	0.33
CDR | Maximum | Non-Agency RMBS - Subordinated interest-only
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.24	0.09
Loss Severity | Minimum | Non-Agency RMBS - Senior
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.35	0.35
Loss Severity | Minimum | Non-Agency RMBS - Senior interest-only
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.30	0.35
Loss Severity | Minimum | Non-Agency RMBS - Subordinated
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.10	0.35
Loss Severity | Minimum | Non-Agency RMBS - Subordinated interest-only
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.35	0.35
Loss Severity | Maximum | Non-Agency RMBS - Senior
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.95	0.89
Loss Severity | Maximum | Non-Agency RMBS - Senior interest-only
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.95	0.95
Loss Severity | Maximum | Non-Agency RMBS - Subordinated
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.70	0.69
Loss Severity | Maximum | Non-Agency RMBS - Subordinated interest-only
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.68	0.63

Fair Value Measurements - Uno_3

Fair Value Measurements - Unobservable Inputs Assumptions - Securitized Debt (Detail) - Loans held for investment - Variable Interest Entities, Primary Beneficiary, Aggregated Disclosure	Dec. 31, 2018	Dec. 31, 2017
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.043	0.041
CPR | Minimum | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.06	0.06
CPR | Maximum | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.18	0.15
CDR | Minimum | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0	0
CDR | Maximum | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.23	0.06
Loss Severity | Minimum | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.30	0.35
Loss Severity | Maximum | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.65	0.60

Fair Value Measurements - Uno_4

Fair Value Measurements - Unobservable Inputs Assumptions - Loans Held for Investment (Detail) - Loans Held for Investment at Fair Value - Level 3	Dec. 31, 2018	Dec. 31, 2017
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Coupon	6.90%	6.90%
FICO	626	627
Loan-to-value (LTV)	88.00%	88.00%
Single family
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Weighted average percent	86.00%	87.00%
Manufactured housing
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Weighted average percent	4.00%	4.00%
Multi-family/mixed use/other
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Weighted average percent	10.00%	9.00%
Owner Occupied
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Weighted average percent	90.00%	95.00%
Investor
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Weighted average percent	1.00%	1.00%
Secondary
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Weighted average percent	9.00%	4.00%
Base Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Coupon	5.20%	4.80%
FICO	638	636
Loan-to-value (LTV)	88.00%	89.00%

Fair Value Measurements - Carry

Fair Value Measurements - Carrying and Fair Values (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securitized debt, collateralized by Non-Agency RMBS	$ 159,955	$ 205,780
Carrying Amount | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Repurchase agreements	14,030,465	7,250,452
Carrying Amount | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securitized debt, collateralized by Non-Agency RMBS	159,955	205,780
Fair Value | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Repurchase agreements	14,085,164	7,269,193
Fair Value | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securitized debt, collateralized by Non-Agency RMBS	$ 140,711	$ 192,259

Repurchase Agreements - Outstan

Repurchase Agreements - Outstanding, Weighted Average Borrowing Rates, Weighted Average Remaining Maturities, Average Daily Balances and the Fair Value of Collateral Pledged (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements outstanding secured by:	$ 14,030,465	$ 7,250,452
Repurchase Agreements | Agency MBS - Residential
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements outstanding secured by:	10,193,272	3,202,056
Average balance of Repurchase agreements secured by:	$ 6,085,643	$ 3,120,474
Average borrowing rate of Repurchase agreements secured by:	2.55%	1.47%
Average remaining maturity of Repurchase agreements secured by:	30 days	28 days
Average original maturity of Repurchase agreements secured by:	88 days	87 days
MBS pledged as collateral at fair value on Repurchase agreements:	$ 10,832,018	$ 3,450,123
Repurchase Agreements | Non-agency MBS and Loans held for investment (in thousands)
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements outstanding secured by:	3,837,193	4,048,396
Average balance of Repurchase agreements secured by:	$ 3,730,527	$ 3,203,700
Average borrowing rate of Repurchase agreements secured by:	4.04%	3.41%
Average remaining maturity of Repurchase agreements secured by:	231 days	93 days
Average original maturity of Repurchase agreements secured by:	259 days	123 days
MBS pledged as collateral at fair value on Repurchase agreements:	$ 4,998,990	$ 5,338,557
Repurchase Agreements | Residential Mortgage-Backed Securities
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements outstanding secured by:	14,030,465	7,250,452
Average balance of Repurchase agreements secured by:	9,816,170	6,324,174
MBS pledged as collateral at fair value on Repurchase agreements:	$ 15,800,000	$ 8,788,680

Repurchase Agreements - Maturit

Repurchase Agreements - Maturities (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements outstanding	$ 14,030,465	$ 7,250,452
Overnight
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements outstanding	0	0
1 to 29 days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements outstanding	6,326,232	4,745,342
30 to 59 days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements outstanding	4,620,656	1,206,769
60 to 89 days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements outstanding	1,504,695	592,865
90 to 119 days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements outstanding	169,244	0
Greater than or equal to 120 days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements outstanding	$ 1,409,638	$ 705,476

Repurchase Agreements - Narrati

Repurchase Agreements - Narrative (Detail) - Repurchase Agreements - Credit Suisse First Boston $ in Millions	Dec. 31, 2017USD ($)
Short-term Debt [Line Items]
Amount at risk	$ 451
Securities Pledged as Collateral | Credit Concentration Risk | Stockholders' Equity, Total
Short-term Debt [Line Items]
Collateral posted on repurchase agreements, percentage of equity	12.00%
Weighted average maturity	25 days

Securitized Debt - Narrative (D

Securitized Debt - Narrative (Detail) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Gains (losses) on extinguishment of debt	$ 7,055,000	$ 9,263,000	$ 387,000	$ 9,670,000	$ 12,742,000	$ (1,000)	$ (48,014,000)	$ 0	$ 26,376,000	$ (35,274,000)	$ (477,000)
Variable Interest Entities, Primary Beneficiary, Aggregated Disclosure | Securitized debt
Debt Instrument [Line Items]
Principal balance of debt	$ 8,600,000,000				$ 9,400,000,000				$ 8,600,000,000	$ 9,400,000,000
Weighted average cost of financing	4.50%				4.20%				4.50%	4.20%
Variable Interest Entities, Primary Beneficiary | Securitized debt
Debt Instrument [Line Items]
Acquired securitized debt collateral outstanding principal balance									$ 861,000,000	$ 1,000,000,000
Repurchase of securitized debt borrowings, collateralized by Non-Agency RMBS									835,000,000	1,100,000,000
Gains (losses) on extinguishment of debt									26,000,000	(1,000)
Securitized Loans | Non-agency MBS
Debt Instrument [Line Items]
Acquired securitized debt collateral outstanding principal balance									0	166,000
Repurchase of securitized debt borrowings, collateralized by Non-Agency RMBS										167,000
Gains (losses) on extinguishment of debt										(35,000,000)
Securitized Loans | Variable Interest Entities, Primary Beneficiary, Aggregated Disclosure | Non-agency MBS
Debt Instrument [Line Items]
Principal balance of debt	$ 175,000,000				$ 219,000,000				$ 175,000,000	$ 219,000,000
Weighted average cost of financing	6.40%				6.20%				6.40%	6.20%

Securitized Debt - Maturities (

Securitized Debt - Maturities (Detail) - Variable Interest Entities, Primary Beneficiary, Aggregated Disclosure - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Securitized debt
Debt Instrument [Line Items]
Within One Year	$ 1,608,381	$ 1,819,018
One to Three Years	2,587,635	2,872,572
Three to Five Years	1,949,060	2,140,434
Greater Than Five Years	2,237,259	2,439,872
Total	8,382,335	9,271,896
Securitized Loans | Non-agency MBS
Debt Instrument [Line Items]
Within One Year	23,602	42,217
One to Three Years	30,803	45,916
Three to Five Years	8,047	16,524
Greater Than Five Years	3,605	4,867
Total	$ 66,057	$ 109,524

Securitized Debt - Callable Deb

Securitized Debt - Callable Debt (Detail) - Securitized Loans $ in Thousands	Dec. 31, 2018USD ($)
Debt Instrument, Redemption [Line Items]
2,019	$ 324,966
2,020	4,188,854
2,021	3,457,006
2,022	274,152
2,023	130,811
Total	$ 8,375,789

Consolidated Securitization V_3

Consolidated Securitization Vehicles and Other Variable Interest Entities - Narrative (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Non-agency MBS
Variable Interest Entity [Line Items]
Unconsolidated VIEs, aggregate investment	$ 1,500,000	$ 1,300,000
Non-agency MBS | Minimum
Variable Interest Entity [Line Items]
Unconsolidated VIEs, individual investments (Less than $1 million minimum)	1,000	1,000
Non-agency MBS | Maximum
Variable Interest Entity [Line Items]
Unconsolidated VIEs, individual investments (Less than $1 million minimum)	52,000	52,000
Variable Interest Entities, Primary Beneficiary, Aggregated Disclosure
Variable Interest Entity [Line Items]
Assets	13,392,951	14,987,464
Liabilities	8,652,158	9,631,820
Variable Interest Entities, Not Primary Beneficiary, Aggregated Disclosure
Variable Interest Entity [Line Items]
Variable interest entity, reporting entity involvement, maximum loss exposure, amount	1,200,000	1,200,000
Subprime | Residential Mortgage
Variable Interest Entity [Line Items]
Financing receivable, significant purchases	$ 2,200,000	$ 1,300,000

Consolidated Securitization V_4

Consolidated Securitization Vehicles and Other Variable Interest Entities - Effect on Consolidated Financial Condition (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets:
Non-Agency RMBS, at fair value	$ 2,486,130	$ 2,851,316
Loans held for investment, at fair value	12,572,581	13,678,263
Accrued interest receivable	123,442	100,789
Other Assets	252,582	114,391
Liabilities:
Securitized debt, collateralized by Non-Agency RMBS	159,955	205,780
Securitized debt at fair value, collateralized by loans held for investment	8,455,376	9,388,657
Accrued interest payable	110,402	61,888
Other liabilities	16,469	17,191
Variable Interest Entities, Primary Beneficiary
Assets:
Non-Agency RMBS, at fair value	1,017,442	1,579,793
Loans held for investment, at fair value	12,263,265	13,263,338
Accrued interest receivable	72,389	75,489
Other Assets	39,855	68,844
Liabilities:
Securitized debt, collateralized by Non-Agency RMBS	159,955	205,780
Securitized debt at fair value, collateralized by loans held for investment	8,455,376	9,388,657
Accrued interest payable	33,541	33,870
Other liabilities	$ 3,286	$ 3,513

Consolidated Securitization V_5

Consolidated Securitization Vehicles and Other Variable Interest Entities - Effect on Consolidated Results (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Variable Interest Entity [Line Items]
Net interest income	$ 154,113	$ 147,044	$ 145,170	$ 147,881	$ 157,753	$ 156,455	$ 150,689	$ 141,113	$ 594,208	$ 606,010	$ 586,211
Total other-than-temporary impairment losses									(2,556)	(5,169)	(9,589)
Portion of loss recognized in other comprehensive income (loss)	(4,269)	$ (7,233)	$ (9,131)	$ (1,158)	$ (18,179)	$ (11,468)	$ (13,509)	$ (18,701)	(19,235)	(56,687)	(48,398)
Net other-than-temporary credit impairment losses									(21,791)	(61,856)	(57,987)
Servicing fees									40,773	41,690	31,178
Variable Interest Entities, Primary Beneficiary
Variable Interest Entity [Line Items]
Total other-than-temporary impairment losses									(1,026)	(2,174)	(1,274)
Portion of loss recognized in other comprehensive income (loss)									(17,820)	(51,118)	(37,475)
Net other-than-temporary credit impairment losses									(18,845)	(53,292)	(38,749)
Servicing fees									39,313	41,493	31,178
Non Agency Residential Mortgage Backed Securities And Securitized Loans | Variable Interest Entities, Primary Beneficiary
Variable Interest Entity [Line Items]
Interest income, Assets of consolidated VIEs	904,830								904,830	914,022	678,623
Interest expense, Non-recourse liabilities of VIEs	$ 395,255								395,255	390,858	249,708
Net interest income									$ 509,575	$ 523,164	$ 428,915

Derivative Instruments - Effect

Derivative Instruments - Effect on Consolidated Financial Condition (Detail) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Notional Amount Outstanding	$ 11,579,400,000	$ 4,827,100,000
Derivative Assets, Net Estimated Fair Value/Carrying Value	37,468,000	48,914,000
Derivative Liabilities, Net Estimated Fair Value/Carrying Value	0	(320,000)
Interest Rate Swaps
Derivatives, Fair Value [Line Items]
Notional Amount Outstanding	10,906,700,000	3,816,400,000
Derivative Assets, Net Estimated Fair Value/Carrying Value	35,798,000	43,257,000
Derivative Liabilities, Net Estimated Fair Value/Carrying Value	0	0
Swaptions
Derivatives, Fair Value [Line Items]
Notional Amount Outstanding	53,000,000	391,000,000
Derivative Assets, Net Estimated Fair Value/Carrying Value	1,670,000	2,105,000
Derivative Liabilities, Net Estimated Fair Value/Carrying Value	0	(320,000)
Treasury Futures
Derivatives, Fair Value [Line Items]
Notional Amount Outstanding	619,700,000	619,700,000
Derivative Assets, Net Estimated Fair Value/Carrying Value	0	3,552,000
Derivative Liabilities, Net Estimated Fair Value/Carrying Value	$ 0	$ 0

Derivative Instruments - Effe_2

Derivative Instruments - Effect on Consolidated Results (Detail) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Net unrealized gains (losses) on derivatives									$ (141,162,000)	$ 47,976,000	$ 50,093,000
Net gains (losses) on derivatives	$ (315,877,000)	$ 74,078,000	$ 24,502,000	$ 94,504,000	$ 31,108,000	$ 1,363,000	$ (21,822,000)	$ (4,462,000)	(122,793,000)	6,188,000	(55,409,000)
Realized gains (losses) on terminations of interest rate swaps									0	16,143,000	60,616,000
Interest Rate Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Net unrealized gains (losses) on derivatives									(125,595,000)	43,697,000	47,170,000
Net realized gains (losses) on derivatives									(1,488,000)	(31,593,000)	(88,722,000)
Treasury Futures
Derivative Instruments, Gain (Loss) [Line Items]
Net unrealized gains (losses) on derivatives									(16,928,000)	1,768,000	378,000
Net realized gains (losses) on derivatives									21,333,000	(4,061,000)	(9,170,000)
Swaptions
Derivative Instruments, Gain (Loss) [Line Items]
Net unrealized gains (losses) on derivatives									1,361,000	2,511,000	2,545,000
Net realized gains (losses) on derivatives									(1,476,000)	(6,134,000)	(7,044,000)
Other Derivative Assets
Derivative Instruments, Gain (Loss) [Line Items]
Net unrealized gains (losses) on derivatives									0	0	0
Net realized gains (losses) on derivatives									$ 0	$ 0	$ (566,000)

Derivative Instruments - Narrat

Derivative Instruments - Narrative (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
The weighted average pay rate on the Company's interest rate swaps	2.58%	1.93%
The weighted average receive rate on the Company's interest rate swaps	2.69%	1.53%
The weighted average maturity on the Company's interest rate swaps	7 years	5 years
Fair value of credit risk derivative instruments in a net asset (liability) position	$ (99)

Capital Stock - Preferred Stock

Capital Stock - Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Preferred stock, par value (usd per share)		$ 0.01				$ 0.01				$ 0.01	$ 0.01
Issuance of preferred stock										$ 251,536	$ 314,429	$ 140,065
Dividends on preferred stock		$ 14,437	$ 9,960	$ 9,400	$ 9,400	$ 9,400	$ 9,400	$ 9,400	$ 5,283	$ 43,197	$ 33,484	$ 2,449
Series C Preferred Stock Par Value
Class of Stock [Line Items]
Shares issued (new shares)	10,400,000
Preferred stock, dividend rate (percent)	7.75%									7.75%	7.75%
Preferred stock, par value (usd per share)		$ 0.01								$ 0.01
Preferred stock, offering price per share (in USD per share)		25								$ 25
Issuance of preferred stock										$ 252,000
Preferred stock, redemption price per share (in USD per share)		25								$ 25
Preferred stock, liquidation preference per share (in USD per share)		$ 25								25
Fixed annual rate (in USD per share)	$ 1.9375
Preferred stock dividends declared (in USD per share)										$ 0.53819
Dividends on preferred stock										$ 6,000
Preferred Class A
Class of Stock [Line Items]
Preferred stock, dividend rate (percent)										8.00%	8.00%
Preferred stock dividends declared (in USD per share)										$ 2
Dividends on preferred stock										$ 12,000
Preferred Class B
Class of Stock [Line Items]
Preferred stock, dividend rate (percent)										8.00%	8.00%
Preferred stock dividends declared (in USD per share)										$ 1.9999910769	$ 1.6833478462
Dividends on preferred stock										$ 26,000	$ 22,000
Series A [Member]
Class of Stock [Line Items]
Preferred stock dividends declared (in USD per share)											$ 2
Dividends on preferred stock											$ 12,000
LIBOR | Series C Preferred Stock Par Value
Class of Stock [Line Items]
Preferred stock, basis spread on variable rate	4.743%

Capital Stock - Common Stock (D

Capital Stock - Common Stock (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Feb. 28, 2018
Class of Stock [Line Items]
Stock repurchase program, authorized amount				$ 100,000,000
Stock repurchased during period (in shares)	883,000	0
Stock repurchased during period, average price (in dollars per share)	$ 16.81
Stock repurchased during period	$ 14,834,000	$ 0	$ 0
Common dividends declared	$ 375,017,000	$ 376,579,000	$ 458,735,000
Dividends declared per share of common stock (usd per share)	$ 2	$ 2
Regular Dividend
Class of Stock [Line Items]
Common dividends declared	$ 375,000,000	$ 377,000,000

Capital Stock - Earnings Per Sh

Capital Stock - Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Numerator:
Net income available to common shareholders	$ (117,235)	$ 147,361	$ 108,708	$ 229,607	$ 98,208	$ 129,832	$ 105,617	$ 157,524	$ 368,440	$ 491,184	$ 549,494
Effect of dilutive securities:									0	0	0
Dilutive net income available to common shareholders									$ 368,440	$ 491,184	$ 549,494
Denominator:
Weighted average basic shares (shares)									187,146,170	187,780,355	187,728,634
Effect of dilutive securities (shares)									602,692	506,965	296,204
Weighted average dilutive shares (shares)									187,748,862	188,287,320	188,024,838
Net income per average share attributable to common stockholders - Basic (usd per share)	$ (0.63)	$ 0.79	$ 0.58	$ 1.22	$ 0.52	$ 0.69	$ 0.56	$ 0.84	$ 1.97	$ 2.62	$ 2.93
Net income per average share attributable to common stockholders - Diluted (usd per share)									$ 1.96	$ 2.61	$ 2.92

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income - Components of AOCI (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
AOCI [Roll Forward]
Beginning Balance	$ 3,634,977	$ 3,123,533
OCI before reclassifications	(185,570)	24,218
Amounts reclassified from AOCI	15,500	54,578
Net current period OCI	(170,070)	78,796
Ending Balance	3,703,829	3,634,977
Unrealized gains (losses) on available-for-sale securities, net
AOCI [Roll Forward]
Beginning Balance	796,902	718,106
OCI before reclassifications	(185,570)	24,218
Amounts reclassified from AOCI	15,500	54,578
Net current period OCI	(170,070)	78,796
Ending Balance	626,832	796,902
Total Accumulated OCI Balance
AOCI [Roll Forward]
Beginning Balance	796,902	718,106
Ending Balance	$ 626,832	$ 796,902

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income - Reclassifications from AOCI (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains (losses) on sales of investments	$ 1,213	$ (6,123)	$ 2,167	$ 0	$ (586)	$ 1	$ 4,541	$ 5,167	$ (2,743)	$ 9,123	$ 18,155
Net other-than-temporary credit impairment losses									(21,791)	(61,856)	(57,987)
Income before income taxes									411,728	524,776	552,026
Income taxes									(91)	(108)	(83)
Net income (loss)	$ (102,798)	$ 157,321	$ 118,108	$ 239,007	$ 107,608	$ 139,232	$ 115,017	$ 162,807	411,637	524,668	$ 551,943
Amounts Reclassified from Accumulated OCI | Unrealized gains (losses) on available-for-sale securities, net
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains (losses) on sales of investments									6,291	7,278
Net other-than-temporary credit impairment losses									(21,791)	(61,856)
Income before income taxes									(15,500)	(54,578)
Income taxes									0	0
Net income (loss)									$ (15,500)	$ (54,578)

Equity Compensation, Employme_3

Equity Compensation, Employment Agreements and other Benefit Plans - Narrative (Detail)	3 Months Ended	12 Months Ended
	Mar. 31, 2017installment	Dec. 31, 2018USD ($)shares	Dec. 31, 2017USD ($)shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Forfeitures (shares) | shares		(8,986)	0
Granted shares (shares) | shares		467,657	348,244
Common dividends declared		$ 8,000,000	$ 4,000,000
401(k) Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum annual contributions per employee, amount		18,500
Maximum annual contribution per employee, additional contribution per employee over certain age		6,000
Expense related to qualified plan		$ 434,000	376,000
Maximum | 401(k) Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer matching contribution, percent of match		100.00%
Employer matching contribution, percent of employees' gross pay		6.00%
Stock Award Deferral Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of installments | installment	5
Restricted Stock | 2007 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		3 years
Shares available for future grants (shares) | shares		5,000,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		3 years
Grant date fair value		$ 6,000,000	$ 4,000,000
Granted shares (shares) | shares		335,000	204,000
Restricted Stock Units (RSUs) | One year from grant date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		33.33%
Restricted Stock Units (RSUs) | Two years from grant date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		33.33%
Restricted Stock Units (RSUs) | Three years from grant date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		33.33%
Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		3 years
Grant date fair value		$ 2,000,000	$ 3,000,000
Granted shares (shares) | shares		133,000	144,000
Performance period		3 years
Performance Share Units | One year from grant date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		33.33%
Performance Share Units | Two years from grant date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		33.33%
Performance Share Units | Three years from grant date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		33.33%
Performance Share Units | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		0.00%
Performance Share Units | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		150.00%

Equity Compensation, Employme_4

Equity Compensation, Employment Agreements and other Benefit Plans - Schedule of Unvested Shares Outstanding (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested shares outstanding - beginning of period (in shares)	769,815	577,547
Granted (shares)	467,657	348,244
Vested (shares)	69,303	155,976
Forfeitures (shares)	(8,986)	0
Unvested shares outstanding - end of period (in shares)	1,159,183	769,815
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Unvested shares outstanding - beginning of period (in USD per share)	$ 25.58	$ 14.53
Granted (in USD per share)	17.90	18.68
Vested (in USD per share)	15.99	30.74
Forfeited (in USD per share)	18.40	0
Unvested shares outstanding - end of period (in USD per share)	$ 16.51	$ 25.58

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income tax expense	$ 91	$ 108	$ 83
Deferred tax assets, gross	7,000	4,000
Deferred tax assets, operating loss carryforwards	550	1,000
Deferred tax assets, other loss carryforwards	7,000	3,000
Deferred tax assets, valuation allowance	$ 7,000	$ 4,000

Credit Risk and Interest Rate_3

Credit Risk and Interest Rate Risk - Offsetting Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Repurchase Agreements
Gross Amounts of Recognized Assets (Liabilities)	$ (14,030,465)	$ (7,250,452)
Gross Amounts Offset in the Consolidated Statements of Financial Position	0	0
Net Amounts Offset in the Consolidated Statements of Financial Position	(14,030,465)	(7,250,452)
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Financial Instruments	15,831,008	8,788,680
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Cash Collateral (Received) Pledged	0	1,156
Net Amount	1,800,543	1,539,384
Derivative Asset
Net Amounts Offset in the Consolidated Statements of Financial Position	37,468	48,914
Derivative Liability
Net Amounts Offset in the Consolidated Statements of Financial Position	0	(320)
Total Liabilities
Gross Amounts of Recognized Assets (Liabilities)	(14,124,509)	(7,201,858)
Gross Amounts Offset in the Consolidated Statements of Financial Position	131,512	0
Net Amounts Offset in the Consolidated Statements of Financial Position	(13,992,997)	(7,201,858)
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Financial Instruments	15,831,008	8,788,680
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Cash Collateral (Received) Pledged	201,332	13,102
Net Amount	2,039,343	1,599,924
Interest Rate Swaps
Derivative Asset
Gross Amounts of Recognized Assets (Liabilities)	87,451	44,874
Gross Amounts Offset in the Consolidated Statements of Financial Position	(51,653)	(1,617)
Net Amounts Offset in the Consolidated Statements of Financial Position	35,798	43,257
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Financial Instruments	0	0
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Cash Collateral (Received) Pledged	198,112	11,570
Net Amount	233,910	54,827
Derivative Liability
Derivatives	(169,790)	(1,617)
Gross Amounts Offset in the Consolidated Statements of Financial Position	169,790	1,617
Net Amounts Offset in the Consolidated Statements of Financial Position	0	0
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Financial Instruments	0	0
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Cash Collateral (Received) Pledged	0	0
Net Amount	0	0
Treasury Futures
Derivative Asset
Gross Amounts of Recognized Assets (Liabilities)	0	3,552
Gross Amounts Offset in the Consolidated Statements of Financial Position	0	0
Net Amounts Offset in the Consolidated Statements of Financial Position	0	3,552
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Financial Instruments	0	0
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Cash Collateral (Received) Pledged	3,220	376
Net Amount	3,220	3,928
Derivative Liability
Derivatives	(13,375)	0
Gross Amounts Offset in the Consolidated Statements of Financial Position	13,375	0
Net Amounts Offset in the Consolidated Statements of Financial Position	0	0
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Financial Instruments	0	0
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Cash Collateral (Received) Pledged	0	0
Net Amount	0	0
Swaptions
Derivative Asset
Gross Amounts of Recognized Assets (Liabilities)	1,670	2,105
Gross Amounts Offset in the Consolidated Statements of Financial Position	0	0
Net Amounts Offset in the Consolidated Statements of Financial Position	1,670	2,105
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Financial Instruments	0	0
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Cash Collateral (Received) Pledged	0	0
Net Amount	1,670	2,105
Derivative Liability
Derivatives	0	(320)
Gross Amounts Offset in the Consolidated Statements of Financial Position	0	0
Net Amounts Offset in the Consolidated Statements of Financial Position	0	(320)
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Financial Instruments	0	0
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Cash Collateral (Received) Pledged	0	0
Net Amount	$ 0	$ (320)

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2018
Loss Contingencies [Line Items]
Investment company, committed capital, funded		$ 2,000
Anacostia LLC | Kah Capital Management LLC (KAH Capital)
Loss Contingencies [Line Items]
Ownership percentage acquired	24.90%
Payment to acquire investment	$ 25
Kah Capital Management LLC (KAH Capital) | Hains Point
Loss Contingencies [Line Items]
Capital commitment	$ 150,000
Investment Advisory Services | Kah Capital Management LLC (KAH Capital)
Loss Contingencies [Line Items]
Revenue		$ 6,500

Commitments and Contingencies -

Commitments and Contingencies - Performance Obligation (Details)	12 Months Ended
	Dec. 31, 2018
Kah Capital Management LLC (KAH Capital) | Investment Advisory Services
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	P3Y

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Jan. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Subsequent Event [Line Items]
Preferred stock, par value (usd per share)		$ 0.01	$ 0.01
Net proceeds from preferred stock offerings		$ 251,536	$ 314,429	$ 140,065
Series D Preferred Stock | Subsequent Event
Subsequent Event [Line Items]
Number of shares issued in transaction (in shares)	8,000,000
Preferred stock, dividend rate (percent)	8.00%
Preferred stock, par value (usd per share)	$ 0.01
Offering price (in usd per share)	25
Preferred stock, redemption price per share (in USD per share)	25
Preferred stock, liquidation preference per share (in USD per share)	$ 25
Net proceeds from preferred stock offerings	$ 194,000

Summarized Quarterly Results _3

Summarized Quarterly Results (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Net interest income:
Interest income	$ 348,033	$ 321,715	$ 306,436	$ 297,132	$ 301,957	$ 296,813	$ 288,644	$ 251,344	$ 1,273,316	[1]	$ 1,138,758	[1]	$ 934,068	[1]
Interest expense	193,920	174,671	161,266	149,251	144,204	140,358	137,955	110,231	679,108	[2]	532,748	[2]	347,857	[2]
Net interest income	154,113	147,044	145,170	147,881	157,753	156,455	150,689	141,113	594,208		606,010		586,211
Net other-than-temporary credit impairment losses	(4,269)	(7,233)	(9,131)	(1,158)	(18,179)	(11,468)	(13,509)	(18,701)	(19,235)		(56,687)		(48,398)
Net gains (losses) on derivatives	(315,877)	74,078	24,502	94,504	31,108	1,363	(21,822)	(4,462)	(122,793)		6,188		(55,409)
Net unrealized gains (losses) on financial instruments at fair value	84,836	(34,306)	(18,364)	14,466	(47,637)	19,042	67,762	72,243	46,632		111,410		59,552
Net realized gains (losses) on sales of investments	1,213	(6,123)	2,167	0	(586)	1	4,541	5,167	(2,743)		9,123		18,155
Gain (loss) on Extinguishment of Debt	7,055	9,263	387	9,670	12,742	(1)	(48,014)	0	26,376		(35,274)		(477)
Total other expenses	29,855	25,395	26,587	26,322	27,657	26,142	24,491	32,537	108,161		110,825		93,019
Net income (loss)	(102,798)	157,321	118,108	239,007	107,608	139,232	115,017	162,807	411,637		524,668		551,943
Dividends on preferred stock	14,437	9,960	9,400	9,400	9,400	9,400	9,400	5,283	43,197		33,484		2,449
Net income (loss) available to common shareholders	$ (117,235)	$ 147,361	$ 108,708	$ 229,607	$ 98,208	$ 129,832	$ 105,617	$ 157,524	$ 368,440		$ 491,184		$ 549,494
Net income per common share-basic (usd per share)	$ (0.63)	$ 0.79	$ 0.58	$ 1.22	$ 0.52	$ 0.69	$ 0.56	$ 0.84	$ 1.97		$ 2.62		$ 2.93
[1]	Includes interest income of consolidated VIEs of $904,830, $914,022 and $678,623 for the years ended December 31, 2018, 2017 and 2016 respectively. See Note 8 to consolidated financial statements for further discussion.
[2]	Includes interest expense of consolidated VIEs of $395,255, $390,858 and $249,708 for the years ended December 31, 2018, 2017 and 2016, respectively . See Note 8 to consolidated financial statements for further discussion.