Ellington Residential Mortgage REIT (EARN) 10-Q 6 Nov 19 2019 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information Document - shares	9 Months Ended
	Sep. 30, 2019	Nov. 01, 2019
Document and Entity Information [Abstract]
Entity Registrant Name	Ellington Residential Mortgage REIT
Entity Central Index Key	0001560672
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Document Type	10-Q
Document Period End Date	Sep. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		12,448,421
Entity Shell Company	false
Entity Current Reporting Status	Yes

CONSOLIDATED BALANCE SHEET

CONSOLIDATED BALANCE SHEET - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
ASSETS
Cash and cash equivalents	$ 50,188	$ 18,585
Mortgage-backed securities, at fair value	1,394,568	1,540,296
Due from brokers	56,734	24,051
Financial derivatives–assets, at fair value	475	11,839
Reverse repurchase agreements	43,008	379
Receivable for securities sold	123,594	74,197
Interest receivable	5,127	5,607
Other assets	708	612
Total Assets	1,674,402	1,675,566
LIABILITIES
Repurchase agreements	1,337,984	1,481,561
Payable for securities purchased	114,684	11,275
Due to brokers	294	1,325
Financial derivatives–liabilities, at fair value	19,886	16,559
U.S. Treasury securities sold short, at fair value	37,835	374
Dividend payable	3,485	4,252
Accrued expenses	681	838
Management fee payable to affiliate	582	579
Interest payable	4,400	4,981
Total Liabilities	1,519,831	1,521,744
SHAREHOLDERS' EQUITY
Preferred shares, par value $0.01 per share, 100,000,000 shares authorized; (0 shares issued and outstanding, respectively)	0	0
Common shares, par value $0.01 per share, 500,000,000 shares authorized; (12,448,421 and 12,507,213 shares issued and outstanding, respectively)	124	125
Additional paid-in-capital	230,303	230,888
Accumulated deficit	(75,856)	(77,191)
Total Shareholders' Equity	154,571	153,822
Total Liabilities and Shareholders' Equity	$ 1,674,402	$ 1,675,566

CONSOLIDATED BALANCE SHEET (Par

CONSOLIDATED BALANCE SHEET (Parenthetical) - $ / shares	Sep. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	12,448,421	12,507,213
Common stock, shares outstanding	12,448,421	12,507,213

CONSOLIDATED STATEMENT OF OPERA

CONSOLIDATED STATEMENT OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
INTEREST INCOME (EXPENSE)
Interest income	$ 10,485	$ 13,171	$ 35,237	$ 40,677
Interest expense	(8,820)	(8,519)	(28,038)	(23,434)
Total net interest income	1,665	4,652	7,199	17,243
EXPENSES
Management fees to affiliate	582	641	1,759	1,968
Professional fees	216	198	652	651
Compensation expense	132	136	394	511
Insurance expense	74	74	221	221
Other operating expenses	341	283	987	924
Total expenses	1,345	1,332	4,013	4,275
OTHER INCOME (LOSS)
Net realized gains (losses) on securities	1,564	(8,402)	1,308	(13,590)
Net realized gains (losses) on financial derivatives	(1,862)	4,058	(22,723)	16,311
Change in net unrealized gains (losses) on securities	9,058	(2,636)	45,540	(32,915)
Change in net unrealized gains (losses) on financial derivatives	(5,351)	4,606	(14,761)	16,005
Total other income (loss)	3,409	(2,374)	9,364	(14,189)
NET INCOME (LOSS)	$ 3,729	$ 946	$ 12,550	$ (1,221)
NET INCOME (LOSS) PER COMMON SHARE:
Basic and Diluted (in dollars per share)	$ 0.30	$ 0.07	$ 1.01	$ (0.09)

CONSOLIDATED STATEMENT OF SHARE

CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands		Total	Common Shares [Member]	Preferred Stock [Member]	Additional Paid-in Capital [Member]	Accumulated (Deficit) Earnings [Member]
Balance, in shares at Dec. 31, 2017			13,340,217	0
Balance at Dec. 31, 2017		$ 192,703	$ 134	$ 0	$ 240,062	$ (47,493)
Share based compensation		49			49
Repurchase of common shares, shares			(512,367)	0
Repurchase of common shares, Value		(5,741)	$ (6)	$ 0	(5,735)
Dividends declared		(4,746)				(4,746)
NET INCOME (LOSS)		(3,953)				(3,953)
Balance, in shares at Mar. 31, 2018			12,827,850	0
Balance at Mar. 31, 2018		178,312	$ 128	$ 0	234,376	(56,192)
Balance, in shares at Dec. 31, 2017			13,340,217	0
Balance at Dec. 31, 2017		$ 192,703	$ 134	$ 0	240,062	(47,493)
Stock Issued During Period, Shares, Restricted Stock Award, Gross		13,144
Repurchase of common shares, shares		(649,887)
Dividends declared	[1]	$ (14,200)
NET INCOME (LOSS)		(1,221)
Balance, in shares at Sep. 30, 2018			12,703,474	0
Balance at Sep. 30, 2018		170,230	$ 127	$ 0	232,967	(62,864)
Balance, in shares at Mar. 31, 2018			12,827,850	0
Balance at Mar. 31, 2018		178,312	$ 128	$ 0	234,376	(56,192)
Share based compensation		50			50
Repurchase of common shares, shares			(115,800)	0
Repurchase of common shares, Value		(1,275)	$ (1)	$ 0	(1,274)
Dividends declared	[1]	(4,704)				(4,704)
NET INCOME (LOSS)		1,786				1,786
Balance, in shares at Jun. 30, 2018			12,712,050	0
Balance at Jun. 30, 2018		$ 174,169	$ 127	$ 0	233,152	(59,110)
Stock Issued During Period, Shares, Restricted Stock Award, Gross		13,144	13,144	0
Stock Issued During Period, Value, Restricted Stock Award, Gross		$ 0	$ 0	$ 0	0
Share based compensation		$ 50			50
Repurchase of common shares, shares		(21,720)	(21,720)	0
Repurchase of common shares, Value		$ (235)	$ 0	$ 0	(235)
Dividends declared	[1]	(4,700)				(4,700)
NET INCOME (LOSS)		946				946
Balance, in shares at Sep. 30, 2018			12,703,474	0
Balance at Sep. 30, 2018		170,230	$ 127	$ 0	232,967	(62,864)
Balance, in shares at Dec. 31, 2018			12,507,213	0
Balance at Dec. 31, 2018		153,822	$ 125	$ 0	230,888	(77,191)
Share based compensation		53			53
Repurchase of common shares, shares			(40,110)	0
Repurchase of common shares, Value		(414)	$ 0	$ 0	(414)
Dividends declared		(4,239)				(4,239)
NET INCOME (LOSS)		8,928				8,928
Balance, in shares at Mar. 31, 2019			12,467,103	0
Balance at Mar. 31, 2019		158,150	$ 125	$ 0	230,527	(72,502)
Balance, in shares at Dec. 31, 2018			12,507,213	0
Balance at Dec. 31, 2018		$ 153,822	$ 125	$ 0	230,888	(77,191)
Stock Issued During Period, Shares, Restricted Stock Award, Gross		15,024
Repurchase of common shares, shares		(73,816)
Repurchase of common shares, Value		$ (747)
Dividends declared	[1]	(11,200)
NET INCOME (LOSS)		12,550
Balance, in shares at Sep. 30, 2019			12,488,421	0
Balance at Sep. 30, 2019		154,571	$ 124	$ 0	230,303	(75,856)
Balance, in shares at Mar. 31, 2019			12,467,103	0
Balance at Mar. 31, 2019		158,150	$ 125	$ 0	230,527	(72,502)
Share based compensation		53			53
Dividends declared	[1]	(3,491)				(3,491)
NET INCOME (LOSS)		(107)				(107)
Balance, in shares at Jun. 30, 2019			12,467,103	0
Balance at Jun. 30, 2019		$ 154,605	$ 125	$ 0	230,580	(76,100)
Stock Issued During Period, Shares, Restricted Stock Award, Gross		15,024	15,024	0
Stock Issued During Period, Value, Restricted Stock Award, Gross		$ 0	$ 0	$ 0	0
Share based compensation		$ 55			55
Repurchase of common shares, shares		(33,706)	(33,706)	0
Repurchase of common shares, Value		$ (333)	$ (1)	$ 0	(332)
Dividends declared	[1]	(3,485)				(3,485)
NET INCOME (LOSS)		3,729				3,729
Balance, in shares at Sep. 30, 2019			12,488,421	0
Balance at Sep. 30, 2019		$ 154,571	$ 124	$ 0	$ 230,303	$ (75,856)
[1]	For the three-month periods ended September 30, 2019 and 2018, dividends totaling $0.28 and $0.37, respectively, per common share outstanding, were declared. For the nine-month periods ended September 30, 2019 and 2018, dividends totaling $0.90 and $1.11, respectively, per common share outstanding, were declared.

CONSOLIDATED STATEMENT OF SHA_2

CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (PARENTHETICAL) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Stockholders' Equity [Abstract]
Dividends declared (in dollars per share)	$ 0.28	$ 0.37	$ 0.90	$ 1.11

CONSOLIDATED STATEMENT OF CASH

CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows provided by (used in) operating activities:
Net income (loss)	$ 12,550	$ (1,221)
Reconciliation of net income (loss) to net cash provided by (used in) operating activities:
Net realized (gains) losses on securities	(1,308)	13,590
Change in net unrealized (gains) losses on securities	(45,540)	32,915
Net realized (gains) losses on financial derivatives	22,723	(16,311)
Change in net unrealized (gains) losses on financial derivatives	14,761	(16,005)
Amortization of premiums and accretion of discounts, net	10,065	8,165
Share based compensation	161	149
(Increase) decrease in assets:
Interest receivable	480	109
Other assets	(96)	(142)
Increase (decrease) in liabilities:
Accrued expenses	(157)	(24)
Interest payable	(581)	1,022
Management fees payable to affiliate	3	(84)
Net cash provided by (used in) operating activities	13,061	22,163
Cash flows provided by (used in) investing activities:
Purchases of securities	(1,308,549)	(1,001,324)
Proceeds from sale of securities	1,400,018	917,962
Principal repayments of mortgage-backed securities	146,230	136,490
Proceeds from investments sold short	513,084	778,977
Repurchase of investments sold short	(476,800)	(829,897)
Proceeds from disposition of financial derivatives	13,928	28,395
Purchase of financial derivatives	(36,634)	(11,798)
Payments made on reverse repurchase agreements	(5,158,083)	(10,302,989)
Proceeds from reverse repurchase agreements	5,115,454	10,357,680
Due from brokers, net	(14,969)	6,217
Due to brokers, net	(182)	7,865
Net cash provided by (used in) investing activities	193,497	87,578
Cash flows provided by (used in) financing activities:
Repurchase of common shares	(747)	(7,251)
Dividends paid	(11,982)	(14,386)
Borrowings under repurchase agreements	1,256,876	1,270,533
Repayments of repurchase agreements	(1,400,453)	(1,367,107)
Due from brokers, net	(17,723)	(6,631)
Due to brokers, net	(926)	0
Cash provided by (used in) financing activities	(174,955)	(124,842)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	31,603	(15,101)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	18,585	56,117
CASH AND CASH EQUIVALENTS, END OF PERIOD	50,188	41,016
Supplemental disclosure of cash flow information:
Interest paid	28,619	22,412
Dividend payable	$ 3,485	$ 4,700

Organization and Investment Obj

Organization and Investment Objective	9 Months Ended
	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Investment Objective	Organization and Investment Objective Ellington Residential Mortgage REIT, or "EARN," was formed as a Maryland real estate investment trust, or "REIT," on August 2, 2012, and commenced operations on September 25, 2012. EARN conducts its business through its wholly owned subsidiaries, EARN OP GP LLC, or the "General Partner," and Ellington Residential Mortgage LP, or the "Operating Partnership," which were formed as a Delaware limited liability company and a Delaware limited partnership, respectively, on July 31, 2012 and commenced operations on September 25, 2012. The Operating Partnership conducts its business of acquiring, investing in, and managing residential mortgage- and real estate-related assets through its wholly owned subsidiaries. EARN, the General Partner, the Operating Partnership, and their consolidated subsidiaries are hereafter defined as the "Company." Ellington Residential Mortgage Management LLC, or the "Manager," serves as the Manager of the Company pursuant to the terms of the Fifth Amended and Restated Management Agreement, or the "Management Agreement." The Manager is an affiliate of Ellington Management Group, L.L.C., or "EMG," an investment management firm that is an SEC-registered investment adviser with a 24-year history of investing in a broad spectrum of mortgage-backed securities and related derivatives, with an emphasis on the residential mortgage-backed securities, or "RMBS," market. In accordance with the terms of the Management Agreement and the Services Agreement (as described in Note 9), the Manager is responsible for administering the Company's business activities and day-to-day operations, and performs certain services, subject to oversight by the Board of Trustees. See Note 9 for further information on the Management Agreement. The Company acquires and manages RMBS, for which the principal and interest payments are guaranteed by a U.S. government agency or a U.S. government-sponsored entity, or "Agency RMBS," and RMBS that do not carry such guarantees, or "non-Agency RMBS," such as RMBS backed by prime jumbo, Alternative A-paper, manufactured housing, and subprime residential mortgage loans. Agency RMBS include both Agency pools and Agency collateralized mortgage obligations, or "CMOs," and non-Agency RMBS primarily consist of non-Agency CMOs, both investment grade and non-investment grade. The Company may also acquire and manage mortgage servicing rights, credit risk transfer securities, residential mortgage loans, and other mortgage- and real estate-related assets. The Company may also invest in other instruments including, but not limited to, forward-settling To-Be-Announced Agency pass-through certificates, or "TBAs," interest rate swaps and swaptions, U.S. Treasury securities, Eurodollar and U.S. Treasury futures, other financial derivatives, and cash equivalents. The Company's targeted investments may range from unrated first loss securities to AAA senior securities. The Company has elected to be taxed as a REIT under the Internal Revenue Code of 1986, as amended, or "the Code," and intends to conduct its operations to be qualified and taxed as a REIT. As a REIT, the Company is required to distribute annually at least 90% of its taxable income. As long as the Company continues to qualify as a REIT, it will not be subject to U.S. federal corporate taxes on its taxable income to the extent that it distributes all of its annual taxable income to its shareholders within the time limits prescribed by the Code. It is the intention of the Company to distribute at least 100% of its taxable income, after application of available tax attributes, within the time limits prescribed by the Code, which may extend into the subsequent taxable year.

Significant Accounting Policies

Significant Accounting Policies	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Significant Accounting Policies	Significant Accounting Policies (A) Basis of Presentation: The Company's unaudited interim consolidated financial statements have been prepared in conformity with generally accepted accounting principles in the United States of America, or "U.S. GAAP." Entities in which the Company has a controlling financial interest, through ownership of the majority of the entities' voting equity interests, or through other contractual rights that give the Company control, are consolidated by the Company. All inter-company balances and transactions have been eliminated. The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates and those differences could be material. In management's opinion, all material adjustments considered necessary for a fair statement of the Company's interim consolidated financial statements have been included and are only of a normal recurring nature. Interim results are not necessarily indicative of the results that may be expected for the entire fiscal year. The information included in this Quarterly Report on Form 10-Q should be read in conjunction with the Company's Annual Report on Form 10-K for the year ended December 31, 2018. (B) Valuation: The Company applies ASC 820-10, Fair Value Measurement ("ASC 820-10"), to its holdings of financial instruments. ASC 820-10 establishes a three-level valuation hierarchy for disclosure of fair value measurements. The valuation hierarchy is based upon the observability of inputs to the valuation of an asset or liability as of the measurement date. The three levels are defined as follows: • Level 1—inputs to the valuation methodology are observable and reflect quoted prices (unadjusted) for identical assets or liabilities in active markets. Currently, the types of financial instruments the Company generally includes in this category are exchange-traded derivatives; • Level 2—inputs to the valuation methodology other than quoted prices included in Level 1 are observable for the asset or liability, either directly or indirectly. Currently, the types of financial instruments that the Company generally includes in this category are Agency RMBS, U.S. Treasury securities, certain non-Agency RMBS, and actively traded derivatives such as TBAs, interest rate swaps, and swaptions; and • Level 3—inputs to the valuation methodology are unobservable and significant to the fair value measurement. Currently, this category includes certain RMBS, such as certain non-Agency RMBS and certain Agency interest only securities, or "IOs," where there is less price transparency. For certain financial instruments, the various inputs that management uses to measure fair value may fall into different levels of the fair value hierarchy. For each such financial instrument, the determination of which category within the fair value hierarchy is appropriate is based on the lowest level of input that is significant to the fair value measurement. ASC 820 prioritizes the various inputs that management uses to measure fair value, with the highest priority given to inputs that are observable and reflect quoted prices (unadjusted) for identical assets or liabilities in active markets (Level 1), and the lowest priority given to inputs that are unobservable and significant to the fair value measurement (Level 3). The assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the financial instrument. The Company may use valuation techniques consistent with the market and income approaches to measure the fair value of its assets and liabilities. The market approach uses third-party valuations and information obtained from market transactions involving identical or similar assets or liabilities. The income approach uses projections of the future economic benefits of an instrument to determine its fair value, such as in the discounted cash flow methodology. The inputs or methodology used for valuing financial instruments are not necessarily an indication of the risk associated with investing in these financial instruments. The leveling of each financial instrument is reassessed at the end of each period. Transfers between levels of the fair value hierarchy are assumed to occur at the end of the reporting period. Summary Valuation Techniques For financial instruments that are traded in an "active market," the best measure of fair value is the quoted market price. However, many of the Company's financial instruments are not traded in an active market. Therefore, management generally uses third-party valuations when available. If third-party valuations are not available, management uses other valuation techniques, such as the discounted cash flow methodology. The following are summary descriptions, for the various categories of financial instruments, of the valuation methodologies management uses in determining fair value of the Company's financial instruments in such categories. Management utilizes such methodologies to assign a fair value (the estimated price that, in an orderly transaction at the valuation date, would be received to sell an asset, or paid to transfer a liability, as the case may be) to each such financial instrument. For the Company's RMBS investments and TBAs, management seeks to obtain at least one third-party valuation, and often obtains multiple valuations when available. Management has been able to obtain third-party valuations on the vast majority of these instruments and expects to continue to solicit third-party valuations in the future. Management generally values each financial instrument at the average of third-party valuations received and not rejected as described below. Third-party valuations are not binding, management may adjust the valuations it receives (e.g., downward adjustments for odd lots), and management may challenge or reject a valuation when, based on its validation criteria, management determines that such valuation is unreasonable or erroneous. Furthermore, based on its validation criteria, management may determine that the average of the third-party valuations received for a given instrument does not result in what management believes to be the fair value of such instrument, and in such circumstances management may override this average with its own good faith valuation. The validation criteria may take into account output from management's own models, recent trading activity in the same or similar instruments, and valuations received from third parties. The use of proprietary models requires the use of a significant amount of judgment and the application of various assumptions including, but not limited to, assumptions concerning future prepayment rates and default rates. Given their relatively high level of price transparency, Agency RMBS pass-throughs and TBAs are typically designated as Level 2 assets. Non-Agency RMBS and Agency interest only and inverse interest only RMBS are generally classified as either Level 2 or Level 3 based on the analysis of available market data and/or third-party valuations. Furthermore, the methodology used by the third-party valuation providers is reviewed at least annually by management, so as to ascertain whether such providers are utilizing observable market data to determine the valuations that they provide. Interest rate swaps and swaptions are typically valued based on internal models that use observable market data, including applicable interest rates in effect as of the measurement date; the model-generated valuations are then typically compared to counterparty valuations for reasonableness. These financial derivatives are generally designated as Level 2 instruments. In valuing its derivatives, the Company also considers the creditworthiness of both the Company and its counterparties, along with collateral provisions contained in each derivative agreement. The Company's repurchase and reverse repurchase agreements are carried at cost, which approximates fair value. Repurchase agreements and reverse repurchase agreements are classified as Level 2 assets and liabilities based on the adequacy of the collateral and their short term nature. The Company's valuation process, including the application of validation criteria, is overseen by the Manager's Valuation Committee ("Valuation Committee"). The Valuation Committee includes senior level executives from various departments within the Manager, and each quarter the Valuation Committee reviews and approves the valuations of the Company's investments. The valuation process also includes a monthly review by the Company's third party administrator. The goal of this review is to replicate various aspects of the Company's valuation process based on the Company's documented procedures. Because of the inherent uncertainty of valuation, the estimated fair value of the Company's financial instruments may differ significantly from the values that would have been used had a ready market for the financial instruments existed, and the differences could be material to the consolidated financial statements. (C) Accounting for Securities: Purchases and sales of securities are recorded on trade date and realized and unrealized gains and losses are calculated based on identified cost. The Company has chosen to make a fair value election pursuant to ASC 825-10, Financial Instruments , for its securities portfolio. Electing the fair value option allows the Company to record changes in fair value in the Consolidated Statement of Operations, which, in management's view, more appropriately reflects the results of operations for a particular reporting period as all securities activities will be recorded in a similar manner. As such, securities are recorded at fair value on the Consolidated Balance Sheet and the period change in fair value is recorded in current period earnings on the Consolidated Statement of Operations as a component of Change in net unrealized gains (losses) on securities. The Company evaluates the cost basis of its Agency IOs and non-Agency RMBS for other-than-temporary impairment, or "OTTI," on at least a quarterly basis. When the fair value of a security is less than its amortized cost basis as of the balance sheet date, the security is considered impaired, and the impairment is designated as either temporary or other-than-temporary. When a security's cost basis is impaired, an OTTI is considered to have occurred if (i) the Company intends to sell the security (i.e., a decision has been made as of the reporting date), (ii) it is more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis, or (iii) the Company does not expect to recover the security's amortized cost basis, even if the Company does not intend to sell the security and it is not more likely than not that the Company will be required to sell the security. If any of these conditions exist as of the financial reporting date, the entire amount of the impairment loss, if any, is recognized in earnings as a realized loss and the cost basis of the security is adjusted. Any resulting OTTI adjustments made to the amortized cost basis of the security are reflected in Net realized gains (losses) on securities, on the Consolidated Statement of Operations. (D) Interest Income: Coupon interest income on investment securities is accrued based on the outstanding principal balance or notional amount and the current coupon rate on each security. The Company amortizes purchase premiums and accretes purchase discounts on its fixed-income securities. For RMBS that are deemed to be of high credit quality at the time of purchase, premiums and discounts are generally amortized/accreted into interest income over the life of such securities using the effective interest method. For such RMBS whose cash flows vary depending on prepayments, an effective yield retroactive to the time of purchase is periodically recomputed based on actual prepayments and changes in projected prepayment activity, and a catch-up adjustment, or "Catch-up Premium Amortization Adjustment," is made to amortization to reflect the cumulative impact of the change in effective yield. For RMBS that are deemed not to be of high credit quality at the time of purchase, interest income is recognized based on the effective interest method. For purposes of determining the effective interest rate, management estimates the future expected cash flows of its investment holdings based on assumptions including, but not limited to, assumptions for future prepayment rates, default rates, and loss severities (each of which may in turn incorporate various macro-economic assumptions, such as future housing prices). These assumptions are re-evaluated not less than quarterly. Principal write-offs are generally treated as realized losses. Changes in projected cash flows, as applied to the current amortized cost of the security, may result in a prospective change in the yield/interest income recognized on such securities. The Company's accretion of discounts and amortization of premiums on securities for U.S. federal and other tax purposes is likely to differ from the accounting treatment under U.S. GAAP of these items as described above. (E) Cash and Cash Equivalents: Cash and cash equivalents include cash and short term investments with original maturities of three months or less at the date of acquisition. Cash and cash equivalents typically include amounts held in an interest bearing overnight account and amounts held in money market funds, and these balances generally exceed insured limits. The Company holds its cash at institutions that it believes to be highly creditworthy. (F) Due from brokers/Due to brokers: Due from brokers and Due to brokers accounts on the Consolidated Balance Sheet include collateral transferred to or received from counterparties, including clearinghouses, along with receivables and payables for open and/or closed derivative positions. (G) Financial Derivatives: The Company enters into various types of financial derivatives subject to its investment guidelines, which include restrictions associated with maintaining its qualification as a REIT. The Company's financial derivatives are predominantly subject to bilateral collateral arrangements or clearing in accordance with the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010. The Company may be required to deliver or may receive cash or securities as collateral upon entering into derivative transactions. In addition, changes in the relative value of financial derivative transactions may require the Company or the counterparty to post or receive additional collateral. In the case of cleared financial derivatives, the clearinghouse becomes the Company's counterparty and a futures commission merchant acts as intermediary between the Company and the clearinghouse with respect to all facets of the related transaction, including the posting and receipt of required collateral. Collateral received by the Company is reflected on the Consolidated Balance Sheet as "Due to Brokers." Conversely, collateral posted by the Company is reflected as "Due from Brokers" on the Consolidated Balance Sheet. The types of financial derivatives that have been utilized by the Company to date are interest rate swaps, TBAs, swaptions, and futures. Swaps: The Company enters into interest rate swaps. Interest rate swaps are contractual agreements whereby one party pays a floating interest rate on a notional principal amount and receives a fixed-rate payment on the same notional principal, or vice versa, for a fixed period of time. The Company enters into interest rate swap contracts primarily to mitigate interest rate risk. The Company is subject to interest rate risk exposure in the normal course of pursuing its investment objectives. Swaps change in value with movements in interest rates or total return of the reference securities. During the term of swap contracts, changes in value are recognized as unrealized gains or losses on the Consolidated Statement of Operations. When a contract is terminated, the Company realizes a gain or loss equal to the difference between the proceeds from (or cost of) the closing transaction and the Company's basis in the contract, if any. Periodic payments or receipts required by swap agreements are recorded as unrealized gains or losses when accrued and realized gains or losses when received or paid. Upfront payments paid and/or received by the Company to open swap contracts are recorded as an asset and/or liability on the Consolidated Balance Sheet and are recorded as a realized gain or loss on the termination date. TBA Securities: The Company transacts in the forward settling TBA market. A TBA position is a forward contract for the purchase ("long position") or sale ("short position") of Agency RMBS at a predetermined price, face amount, issuer, coupon, and maturity on an agreed-upon future delivery date. For each TBA contract and delivery month, a uniform settlement date for all market participants is determined by the Securities Industry and Financial Markets Association. The specific Agency RMBS to be delivered into the contract at the settlement date are not known at the time of the transaction. The Company typically does not take delivery of TBAs, but rather enters into offsetting transactions and settles the associated receivable and payable balances with its counterparties. The Company uses TBAs to mitigate interest rate risk, usually by taking short positions. The Company also invests in TBAs as a means of acquiring additional exposure to Agency RMBS, or for speculative purposes, including holding long positions. TBAs are accounted for by the Company as financial derivatives. The difference between the contract price and the fair value of the TBA position as of the reporting date is included in Change in net unrealized gains (losses) on financial derivatives in the Consolidated Statement of Operations. Upon settlement of the TBA contract, the realized gain (loss) on the TBA contract is equal to the net cash amount received (paid). Options : The Company enters into swaption contracts. It may purchase or write put, call, straddle, or other similar options contracts. The Company enters into options contracts primarily to help mitigate interest rate risk. When the Company purchases an options contract, the option asset is initially recorded at an amount equal to the premium paid, if any, and is subsequently marked-to-market. Premiums paid for purchasing options contracts that expire unexercised are recognized on the expiration date as realized losses. If an options contract is exercised, the premium paid is subtracted from the proceeds of the sale or added to the cost of the purchase to determine whether the Company has realized a gain or loss on the related investment transaction. When the Company writes an options contract, the option liability is initially recorded at an amount equal to the premium received, if any, and is subsequently marked-to-market. Premiums received for writing options contracts that expire unexercised are recognized on the expiration date as realized gains. If an options contract is exercised, the premium received is subtracted from the cost of the purchase or added to the proceeds of the sale to determine whether the Company has realized a gain or loss on the related investment transaction. When the Company enters into a closing transaction, the Company will realize a gain or loss depending upon whether the amount from the closing transaction is greater or less than the premiums paid or received. In general, the Company's options contracts contain forward-settling premiums. In this case, no money is exchanged upfront; instead, the agreed-upon premium is paid by the buyer upon expiration of the options contract, regardless of whether or not the options contract is exercised. Unrealized gains or (losses) resulting from the options contract being marked-to-market are included in Change in net unrealized gains (losses) on financial derivatives in the Consolidated Statement of Operations. Realized gains or (losses) are included in Realized gains (losses) on financial derivatives in the Consolidated Statement of Operations. Futures Contracts : The Company enters into Eurodollar futures contracts and U.S. Treasury futures contracts. A futures contract is an exchange-traded agreement to buy or sell an asset for a set price on a future date. Initial margin deposits are made upon entering into futures contracts and can be either in the form of cash or securities. During the period the futures contract is open, changes in the value of the contract are recognized as unrealized gains or losses by marking-to-market to reflect the current market value of the contract. Unrealized gains or (losses) are included in Change in net unrealized gains (losses) on financial derivatives in the Consolidated Statement of Operations. Variation margin payments are made or received periodically, depending upon whether unrealized losses or gains are incurred. When the contract is closed, the Company records a realized gain or loss equal to the difference between the proceeds of the closing transaction and the Company's basis in the contract. Realized gains or (losses) are included in Realized gains (losses) on financial derivatives in the Consolidated Statement of Operations. Financial derivative assets are included in Financial derivatives–assets, at fair value on the Consolidated Balance Sheet while financial derivative liabilities are included in Financial derivatives–liabilities, at fair value on the Consolidated Balance Sheet. (H) Repurchase Agreements: The Company enters into repurchase agreements with third-party broker-dealers, whereby it sells securities under agreements to repurchase at an agreed upon price and date. The Company accounts for repurchase agreements as collateralized borrowings, with the initial sale price representing the amount borrowed, and with the future repurchase price consisting of the amount borrowed plus interest, at the implied interest rate of the repurchase agreement, on the amount borrowed over the term of the repurchase agreement. The interest rate on a repurchase agreement is based on competitive market rates (or competitive market spreads, in the case of agreements with floating interest rates) at the time such agreement is entered into. When the Company enters into a repurchase agreement, the lender establishes and maintains an account containing cash and/or securities having a value not less than the repurchase price, including accrued interest, of the repurchase agreement. Repurchase agreements are carried at their contractual amounts, which approximate fair value due to their short-term nature. (I) Reverse Repurchase Agreements: The Company enters into reverse repurchase agreement transactions with third-party broker-dealers, whereby it purchases securities under agreements to resell at an agreed upon price and date. The interest rate on a reverse repurchase agreement is based on competitive market rates (or competitive market spreads, in the case of agreements with floating interest rates) at the time such agreement is entered into. Reverse repurchase agreements are carried at their contractual amounts, which approximate fair value due to their short-term nature. Repurchase and reverse repurchase agreements that are conducted with the same counterparty can be reported on a net basis if they meet the requirements of ASC 210-20, Balance Sheet Offsetting . There are currently no repurchase and reverse repurchase agreements reported on a net basis in the Company's consolidated financial statements. (J) Securities Sold Short: The Company may purchase or engage in short sales of U.S. Treasury securities to mitigate the potential impact of changes in interest rates on the performance of its portfolio. When the Company sells securities short, it typically satisfies its security delivery settlement obligation by borrowing or purchasing the security sold short from the same or a different counterparty. When borrowing a security sold short from a counterparty, the Company generally is required to deliver cash or securities to such counterparty as collateral for the Company's obligation to return the borrowed security. The Company has chosen to make the fair value election pursuant to ASC 825-10, Financial Instruments , for its securities sold short. Electing the fair value option allows the Company to record changes in fair value in the Consolidated Statement of Operations, which, in management's view, more appropriately reflects the results of operations for a particular reporting period as all securities activities will be recorded in a similar manner. As such, securities sold short are recorded at fair value on the Consolidated Balance Sheet and the period change in fair value is recorded in current period earnings on the Consolidated Statement of Operations as a component of Change in net unrealized gains (losses) on securities. A realized gain or loss will be recognized upon the termination of a short sale if the market price is less or greater than the original sale price. Such realized gain or loss is recorded on the Company's Consolidated Statement of Operations in Net realized gains (losses) on securities. (K) Offering Costs/Deferred Offering Costs/Underwriters' Discounts: Offering costs, underwriters' discounts and commissions and fees, are charged against shareholders' equity within Additional paid-in-capital. Offering costs typically include legal, accounting, and other fees associated with the cost of raising equity capital. (L) Share Based Compensation: The Company applies the provisions of ASC 718, Compensation—Stock Compensation ("ASC 718"), with regard to its equity incentive plan. ASC 718 covers a wide range of share-based compensation arrangements including share options, restricted share plans, performance-based awards, share appreciation rights, and employee share purchase plans. ASC 718 requires that compensation cost relating to share-based payment transactions be recognized in the financial statements. The cost is measured based on the fair value, at the grant date, of the equity or liability instruments issued and is amortized over the vesting period. Restricted shares issued to the Company's independent trustees and partially dedicated personnel are participating securities and receive dividends prior to vesting. Fair value for such awards is based on the closing stock price on the New York Stock Exchange at the grant date. The vesting period for restricted share awards is typically one to two years . Shares issued to the Company's independent trustees and partially dedicated personnel are subject to tax withholding upon vesting. The Company's independent trustees and partially dedicated personnel are permitted to forfeit a portion of their vested shares to pay such withholding tax. Forfeited shares decrease the total number of shares issued and outstanding and are immediately retired upon settlement. (M) Dividends: Dividends payable are recorded on the declaration date. (N) Expenses: Expenses are recognized as incurred on the Consolidated Statement of Operations. (O) Earnings Per Share: In accordance with the provisions of ASC 260, Earnings per Share , the Company calculates basic income (loss) per share by dividing net income (loss) for the period by the weighted average of the Company's common shares outstanding for that period. Diluted income (loss) per share takes into account the effect of dilutive instruments, such as share options and warrants, and uses the average share price for the period in determining the number of incremental shares that are to be added to the weighted average number of shares outstanding. (P) Share Repurchases: Common shares that are repurchased by the Company subsequent to issuance are immediately retired upon settlement and decrease the total number of shares issued and outstanding. The cost of such share repurchases is charged against Additional paid-in-capital on the Company's Consolidated Balance Sheet. (Q) Income Taxes: The Company has elected to be taxed as a REIT under Sections 856 through 860 of the Code. As a REIT, the Company is generally not subject to corporate-level federal and state income tax on net income it distributes to its shareholders within the prescribed timeframes. To qualify as a REIT, the Company must meet a number of organizational and operational requirements, including distributing at least 90% of its annual taxable income to shareholders. Even if the Company qualifies as a REIT, it may be subject to certain federal, state, local and foreign taxes on its income and property, and to federal income and excise taxes on its undistributed taxable income. If the Company fails to qualify as a REIT, and does not qualify for certain statutory relief provisions, it will be subject to U.S. federal, state, and local income taxes and may be precluded from qualifying as a REIT for the four taxable years following the year in which the Company fails to qualify as a REIT. The Company follows the authoritative guidance on accounting for and disclosure of uncertainty on tax positions, which requires management to determine whether a tax position of the Company is more likely than not to be sustained upon examination by the applicable taxing authority, including resolution of any related appeals or litigation processes, based on the technical merits of the position. For uncertain tax positions, the tax benefit to be recognized is measured as the largest amount of benefit that is greater than 50% likely of being realized upon ultimate settlement. The Company did not have any unrecognized tax benefits resulting from tax positions related to the current period or its open tax years. In the normal course of business, the Company may be subject to examination by federal, state, local, and foreign jurisdictions, where applicable, for the current period and its open tax years. The Company may take positions with respect to certain tax issues which depend on legal interpretation of facts or applicable tax regulations. Should the relevant tax regulators successfully challenge any of such positions, the Company might be found to have a tax liability that has not been recorded in the accompanying consolidated financial statements. Also, management's conclusions regarding the authoritative guidance may be subject to review and adjustment at a later date based on changing tax laws, regulations, and interpretations thereof. There were no amounts accrued for penalties or interest as of or during the periods presented in these consolidated financial statements. (R) Recent Accounting Pronouncements : In August 2018, the Financial Accounting Standards Board, or "FASB," issued ASU 2018-13, Fair Value Measurement—Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement ("ASU 2018-13"). This amends ASC 820, Fair Value Measurement , to remove or modify various current disclosure requirements related to fair value measurement. Additionally ASU 2018-13 requires certain additional disclosures around fair value measurement. ASU 2018-13 is effective for annual periods beginning after December 15, 2019 and interim periods within those years, with early adoption permitted. Entities are permitted to early adopt any removed or modified disclosures and delay adoption of the additional disclosures until their effective date. The Company has elected to early adopt the removal and modification of various disclosure requirements in accordance with ASU 2018-13; early adoption has not had a material impact on the Company's consolidated financial statements. The Company has elected not to early adopt the additional disclosure requirements. The adoption of the additional disclosure requirements, as required under ASU 2018-13, is not expected to have a material impact on the Company's consolidated financial statements. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows—Classification of Certain Cash Receipts and Cash Payments ("ASU 2016-15"). This amends ASC 230, Statement of Cash Flows , to clarify how certain cash receipts and payments should be classified on the statement of cash flows. The updates that most affect the Company relate t

Mortgage-Backed Securities

Mortgage-Backed Securities	9 Months Ended
	Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract]
Mortgage-Backed Securities	Mortgage-Backed Securities The following tables present details of the Company's mortgage-backed securities portfolio at September 30, 2019 and December 31, 2018, respectively. The Company's Agency RMBS include mortgage pass-through certificates and CMOs representing interests in or obligations backed by pools of residential mortgage loans issued or guaranteed by a U.S. government agency or government-sponsored enterprise, or "GSE." The non-Agency RMBS portfolio is not issued or guaranteed by the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation, or any agency of the U.S. Government and is therefore subject to greater credit risk. By RMBS Type September 30, 2019 : ($ in thousands) Gross Unrealized Weighted Average Current Principal Unamortized Premium (Discount) Amortized Cost Gains Losses Fair Value Coupon (1) Yield Life (2) Agency RMBS: 15-year fixed-rate mortgages $ 153,142 $ 2,771 $ 155,913 $ 4,193 $ (94 ) $ 160,012 3.46% 2.94% 4.11 20-year fixed-rate mortgages 17,251 742 17,993 355 — 18,348 4.54% 3.37% 4.04 30-year fixed-rate mortgages 996,703 47,996 1,044,699 17,757 (3,537 ) 1,058,919 4.21% 3.26% 5.89 Adjustable rate mortgages 36,681 1,193 37,874 339 (101 ) 38,112 3.85% 2.27% 2.83 Reverse mortgages 89,444 7,080 96,524 1,946 (34 ) 98,436 4.60% 2.85% 5.74 Interest only securities n/a n/a 12,144 54 (633 ) 11,565 3.03% 2.99% 3.31 Total Agency RMBS 1,293,221 59,782 1,365,147 24,644 (4,399 ) 1,385,392 4.03% 3.17% 5.32 Non-Agency RMBS 11,128 (4,084 ) 7,044 2,132 — 9,176 3.91% 11.38% 5.88 Total RMBS $ 1,304,349 $ 55,698 $ 1,372,191 $ 26,776 $ (4,399 ) $ 1,394,568 4.03% 3.21% 5.33 (1) Weighted average coupon represents the weighted average pass-through rates of the securities rather than the weighted average gross mortgage rates of the underlying collateral. (2) Average lives of RMBS are generally shorter than stated contractual maturities. Average lives are affected by the contractual maturities of the underlying mortgages, scheduled periodic payments of principal, and unscheduled prepayments of principal. December 31, 2018 : ($ in thousands) Gross Unrealized Weighted Average Current Principal Unamortized Premium (Discount) Amortized Cost Gains Losses Fair Value Coupon (1) Yield Life (Years) (2) Agency RMBS: 15-year fixed-rate mortgages $ 135,537 $ 3,307 $ 138,844 $ 655 $ (1,968 ) $ 137,531 3.56% 2.88% 4.90 20-year fixed-rate mortgages 7,267 575 7,842 — (337 ) 7,505 4.00% 2.53% 5.88 30-year fixed-rate mortgages 1,237,047 57,470 1,294,517 2,731 (23,734 ) 1,273,514 4.22% 3.48% 8.10 Adjustable rate mortgages 17,752 1,217 18,969 1 (727 ) 18,243 4.02% 2.63% 3.90 Reverse mortgages 70,991 6,331 77,322 5 (1,423 ) 75,904 4.61% 2.90% 5.58 Interest only securities n/a n/a 16,740 951 (1,325 ) 16,366 4.41% 9.00% 4.24 Total Agency RMBS 1,468,594 68,900 1,554,234 4,343 (29,514 ) 1,529,063 4.19% 3.45% 7.38 Non-Agency RMBS 13,755 (4,324 ) 9,431 1,806 (4 ) 11,233 4.38% 12.59% 5.69 Total RMBS $ 1,482,349 $ 64,576 $ 1,563,665 $ 6,149 $ (29,518 ) $ 1,540,296 4.19% 3.50% 7.37 (1) Weighted average coupon represents the weighted average pass-through rates of the securities rather than the weighted average gross mortgage rates of the underlying collateral. (2) Average lives of RMBS are generally shorter than stated contractual maturities. Average lives are affected by the contractual maturities of the underlying mortgages, scheduled periodic payments of principal, and unscheduled prepayments of principal. By Estimated Weighted Average Life As of September 30, 2019 : ($ in thousands) Agency RMBS Agency Interest Only Securities Non-Agency RMBS Estimated Weighted Average Life (1) Fair Value Amortized Cost Weighted Average Coupon (2) Fair Value Amortized Cost Weighted Average Coupon (2) Fair Value Amortized Cost Weighted Average Coupon (2) Less than three years $ 142,482 $ 140,888 4.78 % $ 4,824 $ 5,306 4.32 % $ 4,210 $ 4,022 5.47 % Greater than three years and less than seven years 842,206 827,820 4.17 % 6,741 6,838 2.17 % 823 282 4.05 % Greater than seven years and less than eleven years 387,146 382,390 3.87 % — — — % 4,143 2,740 2.52 % Greater than eleven years 1,993 1,905 3.50 % — — — % — — — % Total $ 1,373,827 $ 1,353,003 4.15 % $ 11,565 $ 12,144 3.03 % $ 9,176 $ 7,044 3.91 % (1) Average lives of RMBS are generally shorter than stated contractual maturities. (2) Weighted average coupon represents the weighted average pass-through rates of the securities rather than the weighted average gross mortgage rates of the underlying collateral. As of December 31, 2018: ($ in thousands) Agency RMBS Agency Interest Only Securities Non-Agency RMBS Estimated Weighted Average Life (1) Fair Value Amortized Cost Weighted Average Coupon (2) Fair Value Amortized Cost Weighted Average Coupon (2) Fair Value Amortized Cost Weighted Average Coupon (2) Less than three years $ 12,667 $ 12,796 4.69 % $ 1,129 $ 1,671 4.41 % $ 4,635 $ 3,975 4.96 % Greater than three years and less than seven years 394,733 399,895 4.26 % 15,237 15,069 4.41 % 2,500 2,366 5.89 % Greater than seven years and less than eleven years 1,086,032 1,105,538 4.14 % — — — % 4,098 3,090 2.99 % Greater than eleven years 19,265 19,265 4.10 % — — — % — — — % Total $ 1,512,697 $ 1,537,494 4.17 % $ 16,366 $ 16,740 4.41 % $ 11,233 $ 9,431 4.38 % (1) Average lives of RMBS are generally shorter than stated contractual maturities. (2) Weighted average coupon represents the weighted average pass-through rates of the securities rather than the weighted average gross mortgage rates of the underlying collateral. The following tables reflect the components of interest income on the Company's RMBS for the three- and nine-month periods ended September 30, 2019 and 2018: Three-Month Period Ended September 30, 2019 Nine-Month Period Ended September 30, 2019 ($ in thousands) Coupon Interest Net Amortization Interest Income Coupon Interest Net Amortization Interest Income Agency RMBS $ 14,941 $ (5,097 ) $ 9,844 $ 46,893 $ (13,452 ) $ 33,441 Non-Agency RMBS 110 81 191 331 344 675 Total $ 15,051 $ (5,016 ) $ 10,035 $ 47,224 $ (13,108 ) $ 34,116 Three-Month Period Ended Nine-Month Period Ended ($ in thousands) Coupon Interest Net Amortization Interest Income Coupon Interest Net Amortization Interest Income Agency RMBS $ 16,744 $ (4,029 ) $ 12,715 $ 50,341 $ (11,485 ) $ 38,856 Non-Agency RMBS 362 44 406 680 282 962 Total $ 17,106 $ (3,985 ) $ 13,121 $ 51,021 $ (11,203 ) $ 39,818 For the three-month periods ended September 30, 2019 and 2018, the Catch-up Premium Amortization Adjustment was $(1.6) million and $(0.4) million , respectively. For the nine-month periods ended September 30, 2019 and 2018, the Catch-up Premium Amortization Adjustment was $(3.4) million and $(0.1) million , respectively. For the three- and nine-month periods ended September 30, 2019 , the Company recognized a charge of $0.8 million and $4.0 million , respectively, on the cost basis of its Agency IOs, which is included in Net realized gains (losses) on securities, on the Consolidated Statement of Operations. This charge recorded was due to an adverse change in cash flows resulting from an increase in prepayments.

Valuation

Valuation	9 Months Ended
	Sep. 30, 2019
Fair Value Disclosures [Abstract]
Valuation	Valuation The following tables present the Company's financial instruments measured at fair value on: September 30, 2019 : (In thousands) Description Level 1 Level 2 Level 3 Total Assets: Mortgage-backed securities, at fair value: Agency RMBS: 15-year fixed-rate mortgages $ — $ 160,012 $ — $ 160,012 20-year fixed-rate mortgages — 18,348 — 18,348 30-year fixed-rate mortgages — 1,058,919 — 1,058,919 Adjustable rate mortgages — 38,112 — 38,112 Reverse mortgages — 98,436 — 98,436 Interest only securities — 5,150 6,415 11,565 Non-Agency RMBS — 6,882 2,294 9,176 Mortgage-backed securities, at fair value — 1,385,859 8,709 1,394,568 Financial derivatives–assets, at fair value: TBAs — 384 — 384 Interest rate swaps — 91 — 91 Total financial derivatives–assets, at fair value — 475 — 475 Total mortgage-backed securities and financial derivatives–assets, at fair value $ — $ 1,386,334 $ 8,709 $ 1,395,043 Liabilities: U.S. Treasury securities sold short, at fair value $ — $ (37,835 ) $ — $ (37,835 ) Financial derivatives–liabilities, at fair value: TBAs — (307 ) — (307 ) Interest rate swaps — (19,458 ) — (19,458 ) Futures (121 ) — — (121 ) Total financial derivatives–liabilities, at fair value (121 ) (19,765 ) — (19,886 ) Total U.S. Treasury securities sold short and financial derivatives–liabilities, at fair value $ (121 ) $ (57,600 ) $ — $ (57,721 ) December 31, 2018 : (In thousands) Description Level 1 Level 2 Level 3 Total Assets: Mortgage-backed securities, at fair value: Agency RMBS: 15-year fixed-rate mortgages $ — $ 137,531 $ — $ 137,531 20-year fixed-rate mortgages — 7,505 — 7,505 30-year fixed-rate mortgages — 1,273,514 — 1,273,514 Adjustable rate mortgages — 18,243 — 18,243 Reverse mortgages — 75,904 — 75,904 Interest only securities — 13,534 2,832 16,366 Non-Agency RMBS — 6,599 4,634 11,233 Mortgage-backed securities, at fair value — 1,532,830 7,466 1,540,296 Financial derivatives–assets, at fair value: TBAs — 794 — 794 Interest rate swaps — 11,045 — 11,045 Total financial derivatives–assets, at fair value — 11,839 — 11,839 Total mortgage-backed securities and financial derivatives–assets, at fair value $ — $ 1,544,669 $ 7,466 $ 1,552,135 Liabilities: U.S. Treasury securities sold short, at fair value $ — $ (374 ) $ — $ (374 ) Financial derivatives–liabilities, at fair value: TBAs — (2,536 ) — (2,536 ) Interest rate swaps — (6,193 ) — (6,193 ) Futures (7,830 ) — — (7,830 ) Total financial derivatives–liabilities, at fair value (7,830 ) (8,729 ) — (16,559 ) Total U.S. Treasury securities sold short and financial derivatives–liabilities, at fair value $ (7,830 ) $ (9,103 ) $ — $ (16,933 ) The following tables present additional information about the Company's investments which are measured at fair value for which the Company has utilized Level 3 inputs to determine fair value. Three-month period ended September 30, 2019 : (In thousands) Non-Agency RMBS Agency RMBS Beginning balance as of June 30, 2019 $ 2,360 $ 4,950 Purchases — 1,771 Proceeds from sales — — Principal repayments (101 ) — (Amortization)/accretion, net 85 (496 ) Net realized gains (losses) — (557 ) Change in net unrealized gains (losses) (50 ) (120 ) Transfers: Transfers into level 3 — 1,138 Transfers out of level 3 — (271 ) Ending balance as of September 30, 2019 $ 2,294 $ 6,415 All amounts of net realized and changes in net unrealized gains (losses) in the table above are reflected in the accompanying Consolidated Statement of Operations. The table above incorporates changes in net unrealized gains (losses) for both Level 3 financial instruments held by the Company at September 30, 2019 , as well as Level 3 financial instruments disposed of by the Company during the three-month period ended September 30, 2019 . For Level 3 financial instruments held by the Company as of September 30, 2019 , change in net unrealized gains (losses) of $(0.1) million and $(0.2) million , for the three-month period ended September 30, 2019 relate to non-Agency RMBS and Agency RMBS, respectively. At September 30, 2019 , the Company transferred $0.3 million of RMBS from Level 3 to Level 2 and $1.1 million of RMBS from Level 2 to Level 3. Transfers between hierarchy levels are based on the availability of sufficient observable inputs to meet Level 2 versus Level 3 criteria. The level designation of each financial instrument is reassessed at the end of each period, and is based on pricing information received from third party pricing sources. Three-month period ended September 30, 2018: (In thousands) Non-Agency RMBS Agency RMBS Beginning balance as of June 30, 2018 $ 6,993 $ 3,626 Purchases — — Proceeds from sales — — Principal repayments (369 ) — (Amortization)/accretion, net 62 (251 ) Net realized gains (losses) — (11 ) Change in net unrealized gains (losses) 289 62 Transfers: Transfers into level 3 658 1,598 Transfers out of level 3 — (916 ) Ending balance as of September 30, 2018 $ 7,633 $ 4,108 All amounts of net realized and changes in net unrealized gains (losses) in the table above are reflected in the accompanying Consolidated Statement of Operations. The table above incorporates changes in net unrealized gains (losses) for both Level 3 financial instruments held by the Company at September 30, 2018, as well as Level 3 financial instruments disposed of by the Company during the three-month period ended September 30, 2018. For Level 3 financial instruments held by the Company as of September 30, 2018, change in net unrealized gains (losses) of $0.3 million and $0.2 million , for the three-month period ended September 30, 2018 relate to non-Agency RMBS and Agency RMBS, respectively. At September 30, 2018, the Company transferred $0.9 million of RMBS from Level 3 to Level 2 and $2.3 million of RMBS from Level 2 to Level 3. Transfers between these hierarchy levels were based on the availability of sufficient observable inputs to meet Level 2 versus Level 3 criteria. The level designation of each financial instrument is reassessed at the end of each period, and is based on pricing information received from third party pricing sources. Nine-month period ended September 30, 2019 : (In thousands) Non-Agency RMBS Agency RMBS Beginning balance as of December 31, 2018 $ 4,634 $ 2,832 Purchases — 1,771 Proceeds from sales (1,372 ) — Principal repayments (704 ) — (Amortization)/accretion, net 257 (769 ) Net realized gains (losses) 55 (965 ) Change in net unrealized gains (losses) 160 534 Transfers: Transfers into level 3 — 3,680 Transfers out of level 3 (736 ) (668 ) Ending balance as of September 30, 2019 $ 2,294 $ 6,415 All amounts of net realized and changes in net unrealized gains (losses) in the table above are reflected in the accompanying Consolidated Statement of Operations. The table above incorporates changes in net unrealized gains (losses) for both Level 3 financial instruments held by the Company at September 30, 2019 , as well as Level 3 financial instruments disposed of by the Company during the nine-month period ended September 30, 2019 . For Level 3 financial instruments held by the Company as of September 30, 2019 , change in net unrealized gains (losses) of $0.2 million and $(0.3) million , for the nine-month period ended September 30, 2019 relate to non-Agency RMBS and Agency RMBS, respectively. At September 30, 2019 , the Company transferred $1.4 million of RMBS from Level 3 to Level 2 and $3.7 million of RMBS from Level 2 to Level 3. Transfers between hierarchy levels are based on the availability of sufficient observable inputs to meet Level 2 versus Level 3 criteria. The level designation of each financial instrument is reassessed at the end of each period, and is based on pricing information received from third party pricing sources. Nine-month period ended September 30, 2018 : (In thousands) Non-Agency RMBS Agency RMBS Beginning balance as of December 31, 2017 $ 8,832 $ 2,254 Purchases — 160 Proceeds from sales (3,638 ) — Principal repayments (593 ) — (Amortization)/accretion, net 197 (884 ) Net realized gains (losses) 1,254 (177 ) Change in net unrealized gains (losses) (660 ) 536 Transfers: Transfers into level 3 2,241 2,219 Transfers out of level 3 — — Ending balance as of September 30, 2018 $ 7,633 $ 4,108 All amounts of net realized and changes in net unrealized gains (losses) in the table above are reflected in the accompanying Consolidated Statement of Operations. The table above incorporates changes in net unrealized gains (losses) for both Level 3 financial instruments held by the Company as of September 30, 2018 , as well as Level 3 financial instruments disposed of by the Company during the nine-month period ended September 30, 2018 . For Level 3 financial instruments held by the Company as of September 30, 2018 , change in net unrealized gains (losses) of $0.3 million and $0.7 million , for the nine-month period ended September 30, 2018 relate to non-Agency RMBS and Agency RMBS, respectively. At September 30, 2018 , the Company transferred $4.5 million of RMBS from Level 2 to Level 3. Transfers between these hierarchy levels are based on the availability of sufficient observable inputs to meet Level 2 versus Level 3 criteria. The level designation of each financial instrument is reassessed at the end of each period, and is based on pricing information received from third party pricing sources. The following tables identify the significant unobservable inputs that affect the valuation of the Company's Level 3 assets and liabilities as of September 30, 2019 and December 31, 2018: September 30, 2019 : Range Description Fair Value Valuation Technique Significant Unobservable Input Min Max Weighted Average (1) (In thousands) Non-Agency RMBS $ 2,294 Market quotes Non-Binding Third-Party Valuation $ 62.56 $ 90.66 $ 77.12 Agency RMBS–Interest Only Securities 6,415 Option Adjusted Spread ("OAS") LIBOR OAS (2) 77 1,241 374 Projected Collateral Prepayments 46.9 % 87.9 % 80.2 % Projected Collateral Scheduled Amortization 12.1 % 53.1 % 19.8 % 100.0 % (1) Averages are weighted based on the fair value of the related instrument. (2) Shown in basis points. December 31, 2018: Range Description Fair Value Valuation Technique Significant Unobservable Input Min Max Weighted Average (1) (In thousands) Non-Agency RMBS $ 2,745 Market quotes Non-Binding Third-Party Valuation $ 83.59 $ 86.59 $ 85.65 Non-Agency RMBS 1,889 Discounted Cash Flows Yield 3.4 % 5.4 % 4.5 % Projected Collateral Prepayments 50.2 % 66.4 % 56.6 % Projected Collateral Losses 2.3 % 8.6 % 4.9 % Projected Collateral Recoveries 7.5 % 12.3 % 9.6 % Projected Collateral Scheduled Amortization 17.8 % 39.9 % 28.9 % 100.0 % Agency RMBS–Interest Only Securities 2,832 Option Adjusted Spread ("OAS") LIBOR OAS (2) 319 1,439 734 Projected Collateral Prepayments 33.9 % 79.5 % 59.4 % Projected Collateral Scheduled Amortization 20.5 % 66.1 % 40.6 % 100.0 % (1) Averages are weighted based on the fair value of the related instrument. (2) Shown in basis points. Third-party non-binding valuations are validated by comparing such valuations to internally generated prices based on the Company's models and, when available, to recent trading activity in the same or similar instruments. For those instruments valued using discounted cash flows, collateral prepayments, losses, recoveries, and scheduled amortization are projected over the remaining life of the collateral and expressed as a percentage of the collateral's current principal balance. For those assets valued using the LIBOR Option Adjusted Spread, or "OAS," valuation methodology, cash flows are projected using the Company's models over multiple interest rate scenarios, and these projected cash flows are then discounted using the LIBOR rates implied by each interest rate scenario. The LIBOR OAS of an asset is then computed as the unique constant yield spread that, when added to all LIBOR rates in each interest rate scenario generated by the model, will equate (a) the expected present value of the projected asset cash flows over all model scenarios to (b) the actual current market price of the asset. LIBOR OAS is therefore model-dependent. Generally speaking, LIBOR OAS measures the additional yield spread over LIBOR that an asset provides at its current market price after taking into account any interest rate options embedded in the asset. Material changes in any of the inputs above in isolation could result in a significant change to reported fair value measurements. Fair value measurements are impacted by the interrelationships of these inputs. For example, a higher expectation of collateral prepayments will generally result in a lower expectation of collateral losses. Conversely, higher losses will generally result in lower prepayments. The following table summarizes the estimated fair value of all other financial instruments not included in the disclosures above as of September 30, 2019 and December 31, 2018: September 30, 2019 December 31, 2018 (In thousands) Fair Value Carrying Value Fair Value Carrying Value Other financial instruments Assets: Cash and cash equivalents $ 50,188 $ 50,188 $ 18,585 $ 18,585 Due from brokers 56,734 56,734 24,051 24,051 Reverse repurchase agreements 43,008 43,008 379 379 Liabilities: Repurchase agreements 1,337,984 1,337,984 1,481,561 1,481,561 Due to brokers 294 294 1,325 1,325 Cash and cash equivalents includes cash held in an interest bearing overnight account, for which fair value equals the carrying value, and cash held in money market accounts, which are liquid in nature and for which fair value equals the carrying value; such assets are considered Level 1 assets. Due from brokers and Due to brokers include collateral transferred to or received from counterparties, along with receivables and payables for open and/or closed derivative positions. These receivables and payables are short term in nature and any collateral transferred consists primarily of cash; fair value of these items approximates carrying value and such items are considered Level 1 assets and liabilities. The Company's repurchase and reverse repurchase agreements are carried at cost, which approximates fair value due to their short term nature. Repurchase agreements and reverse repurchase agreements are classified as Level 2 assets and liabilities based on the adequacy of the collateral and their short term nature.

Derivative Instruments

Derivative Instruments	9 Months Ended
	Sep. 30, 2019
Derivative Instrument Detail [Abstract]
Derivative Instruments and Hedging Activities Disclosure [Text Block]	Financial Derivatives The Company is exposed to certain risks arising from both its business operations and economic conditions. Specifically, the Company's primary source of financing is repurchase agreements and the Company enters into financial derivative and other instruments to manage exposure to variable cash flows on portions of its borrowings under those repurchase agreements. Since the interest rates on repurchase agreements typically change with market interest rates such as LIBOR, the Company is exposed to constantly changing interest rates, which accordingly affects cash flows associated with the Company's borrowings. To mitigate the effect of changes in these interest rates and their related cash flows, the Company may enter into a variety of derivative contracts, including interest rate swaps, futures, swaptions, and TBAs. Additionally, from time to time, the Company may use short positions in U.S. Treasury securities to mitigate its interest rate risk. The following table details the fair value of the Company's holdings of financial derivatives as of September 30, 2019 and December 31, 2018: September 30, 2019 December 31, 2018 (In thousands) Financial derivatives–assets, at fair value: TBA securities purchase contracts $ 369 $ 794 TBA securities sale contracts 15 — Fixed payer interest rate swaps 86 10,201 Fixed receiver interest rate swaps 5 844 Total financial derivatives–assets, at fair value 475 11,839 Financial derivatives–liabilities, at fair value: TBA securities sale contracts (307 ) (2,536 ) Fixed payer interest rate swaps (19,449 ) (6,190 ) Fixed receiver interest rate swaps (9 ) (3 ) Futures (121 ) (7,830 ) Total financial derivatives–liabilities, at fair value (19,886 ) (16,559 ) Total, net $ (19,411 ) $ (4,720 ) Interest Rate Swaps The following tables provide information about the Company's fixed payer interest rate swaps as of September 30, 2019 and December 31, 2018: September 30, 2019 : Weighted Average Maturity Notional Amount Fair Value Pay Rate Receive Rate Remaining Years to Maturity (In thousands) 2020 $ 86,000 $ (31 ) 1.60 % 2.26 % 0.57 2021 151,606 (2,061 ) 2.11 2.20 1.79 2022 60,100 (857 ) 1.98 2.19 2.63 2023 115,523 (1,897 ) 1.96 2.15 3.85 2024 26,591 (306 ) 1.75 2.22 4.84 2025 105,300 (3,998 ) 2.05 2.10 6.26 2026 12,771 (404 ) 1.93 2.17 7.07 2027 30,000 (1,831 ) 2.29 2.29 7.59 2028 39,807 (4,142 ) 2.80 2.22 8.76 2029 3,849 (77 ) 1.80 2.27 9.82 2036 2,700 (256 ) 2.32 2.16 16.39 2043 12,380 (3,278 ) 2.99 2.18 23.63 2048 630 (225 ) 3.18 2.13 29.18 Total $ 647,257 $ (19,363 ) 2.04 % 2.19 % 4.28 December 31, 2018: Weighted Average Maturity Notional Amount Fair Value Pay Rate Receive Rate Remaining Years to Maturity (In thousands) 2020 $ 86,000 $ 1,390 1.60 % 2.50 % 1.32 2021 165,600 2,099 2.09 2.63 2.52 2022 68,480 1,289 2.00 2.60 3.43 2023 23,600 695 1.88 2.51 4.36 2024 8,900 269 1.99 2.40 5.26 2025 47,722 (202 ) 2.57 2.67 6.17 2026 40,885 2,841 1.63 2.63 7.71 2027 30,000 845 2.29 2.58 8.34 2028 150,563 (4,486 ) 2.97 2.55 9.61 2043 12,380 (338 ) 2.99 2.61 24.38 2048 5,500 (391 ) 3.18 2.69 29.93 Total $ 639,630 $ 4,011 2.26 % 2.58 % 5.77 The following tables provide information about the Company's fixed receiver interest rate swaps as of September 30, 2019 and December 31, 2018. September 30, 2019 : Weighted Average Maturity Notional Amount Fair Value Pay Rate Receive Rate Remaining Years to Maturity (In thousands) 2023 $ 9,940 $ 1 2.09 % 1.53 % 4.01 2024 7,000 4 2.10 1.52 5.01 2029 12,500 (9 ) 2.09 1.57 10.01 Total $ 29,440 $ (4 ) 2.09 % 1.54 % 6.80 December 31, 2018: Weighted Average Maturity Notional Amount Fair Value Pay Rate Receive Rate Remaining Years to Maturity (In thousands) 2023 $ 59,562 $ 406 2.79 % 2.72 % 4.98 2028 18,870 295 2.79 2.89 9.97 2029 9,750 (3 ) 2.81 2.71 10.02 2048 5,000 143 2.78 2.98 29.97 Total $ 93,182 $ 841 2.79 % 2.77 % 7.86 Futures The following tables provide information about the Company's futures as of September 30, 2019 and December 31, 2018. September 30, 2019 : Description Notional Amount Fair Value Remaining Months to Expiration ($ in thousands) U.S. Treasury Futures $ 19,800 $ (121 ) 3.04 December 31, 2018: Description Notional Amount Fair Value Remaining Months to Expiration ($ in thousands) U.S. Treasury Futures $ (301,300 ) $ (7,830 ) 2.76 TBAs The Company transacts in the forward settling TBA market. Pursuant to these TBA transactions, the Company agrees to purchase or sell, for future delivery, Agency RMBS with certain principal and interest terms and certain types of underlying collateral, but the particular Agency RMBS to be delivered is not identified until shortly before the TBA settlement date. TBAs are generally liquid, have quoted market prices, and represent the most actively traded class of MBS. The Company uses TBAs to mitigate interest rate risk, usually by taking short positions. The Company also invests in TBAs as a means of acquiring additional exposure to Agency RMBS, or for speculative purposes, including holding long positions. The Company does not generally take delivery of TBAs; rather, it settles the associated receivable and payable with its trading counterparties on a net basis. Transactions with the same counterparty for the same TBA that result in a reduction of the position are treated as extinguished. As of September 30, 2019 and December 31, 2018, the Company had outstanding contracts to purchase ("long positions") and sell ("short positions") TBA securities as follows: September 30, 2019 December 31, 2018 TBA Securities Notional Amount (1) Cost Basis (2) Market Value (3) Net Carrying Value (4) Notional Amount (1) Cost Basis (2) Market Value (3) Net Carrying Value (4) (In thousands) Purchase contracts: Assets $ 106,465 $ 110,326 $ 110,695 $ 369 $ 95,054 $ 95,967 $ 96,761 $ 794 106,465 110,326 110,695 369 95,054 95,967 96,761 794 Sale contracts: Assets (63,370 ) (65,317 ) (65,302 ) 15 — — — — Liabilities (237,853 ) (247,100 ) (247,407 ) (307 ) (289,012 ) (291,438 ) (293,974 ) (2,536 ) (301,223 ) (312,417 ) (312,709 ) (292 ) (289,012 ) (291,438 ) (293,974 ) (2,536 ) Total TBA securities, net $ (194,758 ) $ (202,091 ) $ (202,014 ) $ 77 $ (193,958 ) $ (195,471 ) $ (197,213 ) $ (1,742 ) (1) Notional amount represents the principal balance of the underlying Agency RMBS. (2) Cost basis represents the forward price to be paid (received) for the underlying Agency RMBS. (3) Market value represents the current market value of the underlying Agency RMBS (on a forward delivery basis) as of period end. (4) Net carrying value represents the difference between the market value of the TBA contract as of period end and the cost basis and is reported in Financial derivatives-assets at fair value and Financial derivatives-liabilities at fair value on the Consolidated Balance Sheet. The table below details the average notional values of the Company's financial derivatives, using absolute value of month end notional values, for the nine-month period ended September 30, 2019 and the year ended December 31, 2018: Derivative Type Nine-Month Period Ended Year Ended (In thousands) Interest rate swaps $ 659,379 $ 606,315 TBAs 519,242 577,864 Futures 138,150 255,538 Options 1,940 5,385 Gains and losses on the Company's financial derivatives for the three- and nine-month periods ended September 30, 2019 and 2018 are summarized in the tables below: Three-Month Period Ended September 30, 2019 Derivative Type Net Realized Gains (Losses) on Periodic Settlements of Interest Rate Swaps Net Realized Gains (Losses) on Financial Derivatives Other Than Periodic Settlements of Interest Rate Swaps Net Realized Gains (Losses) on Financial Derivatives Change in Net Unrealized Gains (Losses) on Accrued Periodic Settlements of Interest Rate Swaps Change in Net Unrealized Gains (Losses) on Financial Derivatives Other Than on Accrued Periodic Settlements of Interest Rate Swaps Change in Net Unrealized Gains (Losses) on Financial Derivatives (In thousands) Interest rate swaps $ 2,347 $ (2,930 ) $ (583 ) $ (1,815 ) $ (4,490 ) $ (6,305 ) TBAs (1,586 ) (1,586 ) 1,315 1,315 Futures 307 307 (361 ) (361 ) Total $ 2,347 $ (4,209 ) $ (1,862 ) $ (1,815 ) $ (3,536 ) $ (5,351 ) Three-Month Period Ended September 30, 2018 Derivative Type Net Realized Gains (Losses) on Periodic Settlements of Interest Rate Swaps Net Realized Gains (Losses) on Financial Derivatives Other Than Periodic Settlements of Interest Rate Swaps Net Realized Gains (Losses) on Financial Derivatives Change in Net Unrealized Gains (Losses) on Accrued Periodic Settlements of Interest Rate Swaps Change in Net Unrealized Gains (Losses) on Financial Derivatives Other Than on Accrued Periodic Settlements of Interest Rate Swaps Change in Net Unrealized Gains (Losses) on Financial Derivatives (In thousands) Interest rate swaps $ 1,281 $ 2,096 $ 3,377 $ (893 ) $ 2,383 $ 1,490 TBAs (692 ) (692 ) 2,100 2,100 Futures 1,622 1,622 1,237 1,237 Options (249 ) (249 ) (221 ) (221 ) Total $ 1,281 $ 2,777 $ 4,058 $ (893 ) $ 5,499 $ 4,606 Nine-Month Period Ended September 30, 2019 Derivative Type Net Realized Gains (Losses) on Periodic Settlements of Interest Rate Swaps Net Realized Gains (Losses) on Financial Derivatives Other Than Periodic Settlements of Interest Rate Swaps Net Realized Gains (Losses) on Financial Derivatives Change in Net Unrealized Gains (Losses) on Accrued Periodic Settlements of Interest Rate Swaps Change in Net Unrealized Gains (Losses) on Financial Derivatives Other Than on Accrued Periodic Settlements of Interest Rate Swaps Change in Net Unrealized Gains (Losses) on Financial Derivatives (In thousands) Interest rate swaps $ 2,978 $ (5,223 ) $ (2,245 ) $ (1,105 ) $ (23,184 ) $ (24,289 ) TBAs (6,578 ) (6,578 ) 1,819 1,819 Futures (13,800 ) (13,800 ) 7,709 7,709 Options (100 ) (100 ) — — Total $ 2,978 $ (25,701 ) $ (22,723 ) $ (1,105 ) $ (13,656 ) $ (14,761 ) Nine-Month Period Ended September 30, 2018 Derivative Type Net Realized Gains (Losses) on Periodic Settlements of Interest Rate Swaps Net Realized Gains (Losses) on Financial Derivatives Other Than Periodic Settlements of Interest Rate Swaps Net Realized Gains (Losses) on Financial Derivatives Change in Net Unrealized Gains (Losses) on Accrued Periodic Settlements of Interest Rate Swaps Change in Net Unrealized Gains (Losses) on Financial Derivatives Other Than on Accrued Periodic Settlements of Interest Rate Swaps Change in Net Unrealized Gains (Losses) on Financial Derivatives (In thousands) Interest rate swaps $ 1,072 $ 5,065 $ 6,137 $ (932 ) $ 12,167 $ 11,235 TBAs 10,151 10,151 1,460 1,460 Futures 272 272 3,242 3,242 Options (249 ) (249 ) 68 68 Total $ 1,072 $ 15,239 $ 16,311 $ (932 ) $ 16,937 $ 16,005 From time to time, the Company uses short positions in U.S. Treasury positions as a component of its interest rate hedging portfolio. As of September 30, 2019 , the Company held short positions in U.S. Treasury securities, with a principal amount of $37.4 million and a fair value of $37.8 million . As of December 31, 2018, the Company held short positions in U.S. Treasury securities, with a principal amount of $0.4 million and a fair value of $0.4 million . Such securities are included on the Company's Consolidated Balance Sheet under the caption U.S. Treasury securities sold short, at fair value.

Borrowings under Repurchase Agr

Borrowings under Repurchase Agreements	9 Months Ended
	Sep. 30, 2019
Disclosure of Repurchase Agreements [Abstract]
Repurchase Agreements Disclosure [Text Block]	Borrowings under Repurchase Agreements The Company enters into repurchase agreements. A repurchase agreement involves the sale of an asset to a counterparty together with a simultaneous agreement to repurchase the transferred asset or similar asset from such counterparty at a future date. The Company accounts for its repurchase agreements as collateralized borrowings, with the transferred assets effectively serving as collateral for the related borrowing. The Company's repurchase agreements typically range in term from 30 to 180 days. The principal economic terms of each repurchase agreement—such as loan amount, interest rate, and maturity date—are typically negotiated on a transaction-by-transaction basis. Other terms and conditions, such as relating to events of default, are typically governed under the Company's master repurchase agreements. Absent an event of default, the Company maintains beneficial ownership of the transferred securities during the term of the repurchase agreement and receives the related principal and interest payments. Interest rates on these borrowings are generally fixed based on prevailing rates corresponding to the terms of the borrowings, and interest is paid at the termination of the repurchase agreement at which time the Company may enter into a new repurchase agreement at prevailing market rates with the same counterparty, repay that counterparty and possibly negotiate financing terms with a different counterparty, or choose to no longer finance the related asset. In response to a decline in the fair value of the transferred securities, whether as a result of changes in market conditions, security paydowns, or other factors, repurchase agreement counterparties will typically make a margin call, whereby the Company will be required to post additional securities and/or cash as collateral with the counterparty in order to re-establish the agreed-upon collateralization requirements. In the event of increases in fair value of the transferred securities, the Company generally can require the counterparty to post collateral with it in the form of cash or securities. The Company is generally permitted to sell or re-pledge any securities posted by the counterparty as collateral; however, upon termination of the repurchase agreement, or other circumstance in which the counterparty is no longer required to post such margin, the Company must return to the counterparty the same security that had been posted. The contractual amount (loan amount) of the Company's repurchase agreements approximates fair value, based on the short-term nature of the debt and the adequacy of the collateral. At any given time, the Company seeks to have its outstanding borrowings under repurchase agreements with several different counterparties in order to reduce the exposure to any single counterparty. As of September 30, 2019 and December 31, 2018, the Company had outstanding borrowings under repurchase agreements with 14 and 12 counterparties, respectively. The following table details the Company's outstanding borrowings under repurchase agreements as of September 30, 2019 and December 31, 2018: September 30, 2019 December 31, 2018 Weighted Average Weighted Average Remaining Days to Maturity Borrowings Outstanding Interest Rate Remaining Days to Maturity Borrowings Outstanding Interest Rate Remaining Days to Maturity (In thousands) 30 days or less $ 436,356 2.44 % 14 $ 512,505 2.45 % 16 31-60 days 589,760 2.27 46 594,199 2.56 46 61-90 days 273,218 2.21 74 359,861 2.71 75 91-120 days 20,881 2.39 94 — — — 121-150 days — — — — — — 151-180 days 17,769 2.15 169 14,996 2.72 177 Total $ 1,337,984 2.31 % 44 $ 1,481,561 2.56 % 44 Repurchase agreements involving underlying investments that the Company sold prior to period end, for settlement following period end, are shown using their original maturity dates even though such repurchase agreements may be expected to be terminated early upon settlement of the sale of the underlying investment. As of September 30, 2019 and December 31, 2018, the fair value of RMBS transferred as collateral under outstanding borrowings under repurchase agreements was $1.4 billion and $1.6 billion , respectively. Collateral transferred under outstanding borrowings as of September 30, 2019 includes RMBS in the amount of $91.5 million that were sold prior to period end but for which such sale had not yet settled. Collateral transferred under outstanding borrowings as of December 31, 2018 includes RMBS in the amount of $74.4 million that were sold prior to year end but for which such sale had not yet settled. In addition as of September 30, 2019 , the Company was posting to repurchase agreement counterparties net cash collateral of $22.5 million as a result of margin calls with various repurchase agreement counterparties. As of December 31, 2018, the Company was posting to repurchase agreement counterparties net cash collateral of $3.8 million and additional securities with a fair value of $1.1 million as a result of margin calls with various repurchase agreement counterparties. Amount at risk represents the excess, if any, for each counterparty of the fair value of collateral held by such counterparty over the amounts outstanding under repurchase agreements. The following table reflects counterparties for which the amounts at risk relating to our repurchase agreements were greater than 10% of shareholders' equity as of December, 31, 2018. There was no counterparty for which the amount at risk was greater than 10% of shareholders' equity as of September 30, 2019. December 31, 2018: Counterparty Amount at Risk (1) Weighted Average Remaining Days to Maturity Percentage of Shareholders' Equity (In thousands) Wells Fargo Bank, N.A. $ 20,214 41 13.1 % Royal Bank of Canada 16,563 43 10.8 % J.P. Morgan Securities LLC 16,057 39 10.4 % (1) Amounts at risk exclude, in aggregate, $(43) thousand of net accrued interest, defined as accrued interest on securities held as collateral less interest payable on cash borrowed.

Offsetting of Assets and Liabil

Offsetting of Assets and Liabilities	9 Months Ended
	Sep. 30, 2019
Offsetting of Assets and Liabilities [Abstract]
OffsettingOfAssetsAndLiabilities [Text Block]	Offsetting of Assets and Liabilities The Company records certain financial instruments at fair value as described in Note 2. All financial instruments are recorded on a gross basis on the Consolidated Balance Sheet. In connection with its financial derivatives, repurchase agreements, and related trading agreements, the Company and its counterparties are required to pledge collateral. Cash or other collateral is exchanged as required with each of the Company's counterparties in connection with open derivative positions and repurchase agreements. The following tables present information about certain assets and liabilities representing financial instruments as of September 30, 2019 and December 31, 2018. The Company has not previously entered into master netting agreements with any of its counterparties. Certain of the Company's repurchase and reverse repurchase agreements and financial derivative transactions are governed by underlying agreements that generally provide a right of offset in the event of default or in the event of a bankruptcy of either party to the transaction. September 30, 2019 : Description Amount of Assets (Liabilities) Presented in the Consolidated Balance Sheet (1) Financial Instruments Available for Offset Financial Instruments Transferred or Pledged as Collateral (2)(3) Cash Collateral (Received) Pledged (2)(3) Net Amount (In thousands) Assets: Financial derivatives–assets $ 475 $ (312 ) $ — $ — $ 163 Reverse repurchase agreements 43,008 (43,008 ) — — — Liabilities: Financial derivatives–liabilities (19,886 ) 312 — 19,341 (233 ) Repurchase agreements (1,337,984 ) 43,008 1,272,522 22,454 — (1) In the Company's Consolidated Balance Sheet, all balances associated with the repurchase agreements and financial derivatives are presented on a gross basis. (2) For the purpose of this presentation, for each row the total amount of financial instruments transferred or pledged and cash collateral (received) or pledged may not exceed the applicable gross amount of assets or (liabilities) as presented here. Therefore, the Company has reduced the amount of financial instruments transferred or pledged as collateral related to the Company's repurchase agreements and cash collateral pledged on the Company's financial derivative assets and liabilities. Total financial instruments transferred or pledged as collateral on the Company's repurchase agreements as of September 30, 2019 were $1.39 billion . As of September 30, 2019 total cash collateral (received) pledged on financial derivative assets and liabilities excludes $1.1 million and $13.6 million respectively of net excess cash collateral. (3) When collateral is pledged to or pledged by a counterparty, it is often pledged or posted with respect to all positions with such counterparty, and in such cases such collateral cannot be specifically identified as relating to a specific asset or liability. As a result, in preparing the above table, the Company has made assumptions in allocating pledged or posted collateral among the various rows. December 31, 2018: Description Amount of Assets (Liabilities) Presented in the Consolidated Balance Sheet (1) Financial Instruments Available for Offset Financial Instruments Transferred or Pledged as Collateral (2)(3) Cash Collateral (Received) Pledged (2)(3) Net Amount (In thousands) Assets: Financial derivatives–assets $ 11,839 $ (7,016 ) $ — $ (151 ) $ 4,672 Reverse repurchase agreements 379 (379 ) — — — Liabilities: Financial derivatives–liabilities (16,559 ) 7,016 — 9,321 (222 ) Repurchase agreements (1,481,561 ) 379 1,477,377 3,805 — (1) In the Company's Consolidated Balance Sheet, all balances associated with the repurchase agreements and financial derivatives are presented on a gross basis. (2) For the purpose of this presentation, for each row the total amount of financial instruments transferred or pledged and cash collateral (received) or pledged may not exceed the applicable gross amount of assets or (liabilities) as presented here. Therefore the Company has reduced the amount of financial instruments transferred or pledged as collateral related to the Company's repurchase agreements and cash collateral pledged on the Company's financial derivative assets and liabilities. Total financial instruments transferred or pledged as collateral on the Company's repurchase agreements as of December 31, 2018 were $1.57 billion . As of December 31, 2018 total cash collateral on financial derivative assets and liabilities excludes $5.1 million and $4.6 million , respectively of net excess cash collateral. (3) When collateral is pledged to or pledged by a counterparty, it is often pledged or posted with respect to all positions with such counterparty, and in such cases such collateral cannot be specifically identified as relating to a specific asset or liability. As a result, in preparing the above table, the Company has made assumptions in allocating pledged or posted collateral among the various rows.

Earnings per Share

Earnings per Share	9 Months Ended
	Sep. 30, 2019
Earnings Per Share [Abstract]
Earnings per Share	Earnings Per Share Basic earnings per share, or "EPS," is calculated by dividing net income (loss) for the period by the weighted average of the Company's common shares outstanding for the period. Diluted EPS takes into account the effect of outstanding dilutive instruments, such as share options and warrants, if any, and uses the average share price for the period in determining the number of incremental shares that are to be added to the weighted average number of shares outstanding. As of September 30, 2019 and 2018, the Company did not have any dilutive instruments outstanding. The following table presents a reconciliation of the earnings/(losses) and shares used in calculating basic EPS for the three- and nine-month periods ended September 30, 2019 and 2018: Three-Month Period Ended September 30, Nine-Month Period Ended September 30, (In thousands except for share amounts) 2019 2018 2019 2018 Numerator: Net income (loss) $ 3,729 $ 946 $ 12,550 $ (1,221 ) Denominator: Basic and diluted weighted average shares outstanding 12,459,478 12,693,989 12,464,800 12,875,884 Basic and diluted earnings per share $ 0.30 $ 0.07 $ 1.01 $ (0.09 )

Related Party Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2019
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Management Agreement The Company is party to the Management Agreement, which has a current term that expires on September 24, 2020, and has been, and is expected to be, renewed automatically each year thereafter for an additional one -year period, subject to certain termination rights. The Company is externally managed and advised by the Manager. Pursuant to the terms of the Management Agreement, the Manager provides the Company with its management team, including its officers, and appropriate support personnel. The Company does not have any employees. The Manager is responsible for the day-to-day operations of the Company. The Manager receives an annual management fee in an amount equal to 1.50% per annum of shareholders' equity (as defined in the Management Agreement) as of the end of each fiscal quarter (before deductions for any management fee with respect to such fiscal period). The management fee is payable quarterly in arrears. For each of the three-month periods ended September 30, 2019 and 2018, the total management fee incurred was $0.6 million . For the nine-month periods ended September 30, 2019 and 2018, the total management fee incurred was $1.8 million and $2.0 million , respectively. Services Agreement The Manager and EMG are parties to a services agreement, pursuant to which EMG is required to provide to the Manager sufficient personnel, services, and resources to enable the Manager to carry out its obligations and responsibilities under the Management Agreement. The Company is a named third-party beneficiary to the services agreement and, as a result, has, as a non-exclusive remedy, a direct right of action against EMG in the event of any breach by the Manager of any of its duties, obligations, or agreements under the Management Agreement that arise out of or result from any breach by EMG of its obligations under the services agreement. The services agreement will terminate upon the termination of the Management Agreement. Pursuant to the services agreement, the Manager makes certain payments to EMG in connection with the services provided. The Manager and EMG have overlapping ownership and are under common control. Expense Reimbursement Under the terms of the Management Agreement, the Company is required to reimburse the Manager for operating expenses related to the Company that are incurred by the Manager, including expenses relating to legal, accounting, due diligence, other services, and all other costs and expenses. The Company's reimbursement obligation is not subject to any dollar limitation. Expenses will be reimbursed in cash within 60 days following delivery of the expense statement by the Manager; provided, however, that such reimbursement may be offset by the Manager against amounts due to the Company from the Manager. The Company will not reimburse the Manager for the salaries and other compensation of the Manager's personnel except that the Company will be responsible for expenses incurred by the Manager in employing certain dedicated or partially dedicated personnel as further described below. The Company reimburses the Manager for the allocable share of the compensation, including, without limitation, wages, salaries, and employee benefits paid or reimbursed, as approved by the Compensation Committee of the Board of Trustees, to certain dedicated or partially dedicated personnel who spend all or a portion of their time managing the Company's affairs, based upon the percentage of time devoted by such personnel to the Company's affairs. In their capacities as officers or personnel of the Manager or its affiliates, such personnel will devote such portion of their time to the Company's affairs as is necessary to enable the Company to operate its business. For the nine-month periods ended September 30, 2019 and 2018, the Company reimbursed the Manager $1.7 million and $1.8 million , respectively, for previously incurred operating and compensation expenses. As of September 30, 2019 and December 31, 2018, the outstanding payable to the Manager for operating and compensation expenses was $0.3 million and $0.6 million , respectively, which are included in Accrued expenses on the Consolidated Balance Sheet. Termination Fee The Management Agreement requires the Company to pay a termination fee to the Manager in the event of (1) the Company's termination or non-renewal of the Management Agreement without cause or (2) the Manager's termination of the Management Agreement upon a default by the Company in the performance of any material term of the Management Agreement. Such termination fee will be equal to 5% of Shareholders' Equity, as defined in the Management Agreement as of the month-end preceding the date of the notice of termination or non-renewal of the Management Agreement. Registration Rights Agreement The Company is a party to a registration rights agreement with an affiliate of EMG and with the Blackstone Tactical Opportunities Funds (the "Blackstone Funds") pursuant to which the Company has granted its initial investors and each of their permitted transferees and other holders of the Company's "registrable common shares" (as such term is defined in the registration rights agreement) who become parties to the registration rights agreement with certain demand and/or piggy-back registration and shelf takedown rights .

Capital

Capital	9 Months Ended
	Sep. 30, 2019
Equity [Abstract]
Capital	Capital The Company has authorized 500,000,000 common shares, $0.01 par value per share, and 100,000,000 preferred shares, $0.01 par value per share. The Board of Trustees may authorize the issuance of additional shares of either class. As of September 30, 2019 and December 31, 2018, there were 12,448,421 and 12,507,213 common shares outstanding, respectively. No preferred shares have been issued. During the three-month periods ended September 30, 2019 and 2018, the Board of Trustees authorized dividends totaling $0.28 per share and $0.37 per share, respectively. Total dividends declared during the three-month periods ended September 30, 2019 and 2018 were $3.5 million and $4.7 million , respectively. During the nine-month periods ended September 30, 2019 and 2018, the Board of Trustees authorized dividends totaling $0.90 per share and $1.11 per share, respectively. Total dividends declared during the nine-month periods ended September 30, 2019 and 2018 were $11.2 million and $14.2 million , respectively. On September 11, 2019, the Company's Board of Trustees authorized the issuance of 15,024 shares to its independent trustees pursuant to trustee share award agreements. Such shares will vest and become non-forfeitable on September 10, 2020. Detailed below is a roll forward of the Company's common shares outstanding for the three- and nine-month periods ended September 30, 2019 and 2018: Three-Month Period Ended September 30, Nine-Month Period Ended September 30, 2019 2018 2019 2018 Common Shares Outstanding (6/30/2019, 6/30/2018, 12/31/2018, and 12/31/2017, respectively) 12,467,103 12,712,050 12,507,213 13,340,217 Share Activity: Restricted shares issued 15,024 13,144 15,024 13,144 Shares repurchased (33,706 ) (21,720 ) (73,816 ) (649,887 ) Common Shares Outstanding (9/30/2019, 9/30/2018, 9/30/2019, and 9/30/2018, respectively) 12,448,421 12,703,474 12,448,421 12,703,474 Unvested restricted shares outstanding (9/30/2019, 9/30/2018, 9/30/2019, and 9/30/2018, respectively) 23,039 19,113 23,039 19,113 The below table provides details on the Company's restricted shares granted pursuant to share award agreements which are unvested at September 30, 2019 : Grant Recipient Number of Restricted Shares Granted Grant Date Vesting Date (1) Independent trustees: 15,024 September 11, 2019 September 10, 2020 Partially dedicated employees: 3,117 December 11, 2018 December 11, 2019 3,115 December 11, 2018 December 11, 2020 1,783 December 12, 2017 December 12, 2019 (1) Date at which such restricted shares will vest and become non-forfeitable. As of September 30, 2019 , there were 306,061 shares available for future issuance under the Company's 2013 Equity Incentive Plan. On June 13, 2018, the Company's Board of Trustees approved the adoption of a share repurchase program under which the Company is authorized to repurchase up to 1.2 million common shares. The program, which is open-ended in duration, allows the Company to make repurchases from time to time on the open market or in negotiated transactions, including through Rule 10b5-1 plans. Repurchases are at the Company's discretion, subject to applicable law, share availability, price and its financial performance, among other considerations. During the three-month period ended September 30, 2019 , the Company repurchased 33,706 of its common shares at an aggregate cost of $0.3 million , and an average price per share of $9.87 . During the nine-month period ended September 30, 2019 , the Company repurchased 73,816 of its common shares at an aggregate cost of $0.7 million , and an average price per share of $10.12 . From inception of the current share repurchase program adopted on June 13, 2018 through September 30, 2019 , the Company repurchased 298,029 of its common shares at an aggregate cost of $3.1 million , and an average price per share of $10.46 . Distribution Policy The timing and frequency of distributions will be determined by the Board of Trustees based upon a variety of factors deemed relevant by the Company's trustees, including restrictions under applicable law, capital requirements of the Company, and the REIT requirements of the Code. Distributions to shareholders generally will be taxable as ordinary income, although a portion of such distributions may be designated as long-term capital gain or qualified dividend income, or may constitute a return of capital. The Company will furnish annually to each shareholder a statement setting forth distributions paid or deemed paid during the preceding year and their U.S. federal income tax treatment. It is the intention of the Company to distribute at least 100% of its taxable income, after application of available tax attributes, within the time limits prescribed by the Internal Revenue Code, which may extend into the subsequent taxable year.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2019
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. The Company provides current trustees and officers with a limited indemnification against liabilities arising in connection with the performance of their duties to the Company. In the normal course of business the Company may also enter into contracts that contain a variety of representations, warranties, and general indemnifications. The Company's maximum exposure under these arrangements, including future claims that may be made against the Company that have not yet occurred, is unknown. The Company has not incurred any costs to defend lawsuits or settle claims related to these indemnification agreements. The Company has no liabilities recorded for these agreements as of September 30, 2019 and December 31, 2018 and management is not aware of any significant contingencies at September 30, 2019 .

Significant Accounting Polici_2

Significant Accounting Policies Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation: The Company's unaudited interim consolidated financial statements have been prepared in conformity with generally accepted accounting principles in the United States of America, or "U.S. GAAP." Entities in which the Company has a controlling financial interest, through ownership of the majority of the entities' voting equity interests, or through other contractual rights that give the Company control, are consolidated by the Company. All inter-company balances and transactions have been eliminated. The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates and those differences could be material. In management's opinion, all material adjustments considered necessary for a fair statement of the Company's interim consolidated financial statements have been included and are only of a normal recurring nature. Interim results are not necessarily indicative of the results that may be expected for the entire fiscal year. The information included in this Quarterly Report on Form 10-Q should be read in conjunction with the Company's Annual Report on Form 10-K for the year ended December 31, 2018.
Valuation	Valuation: The Company applies ASC 820-10, Fair Value Measurement ("ASC 820-10"), to its holdings of financial instruments. ASC 820-10 establishes a three-level valuation hierarchy for disclosure of fair value measurements. The valuation hierarchy is based upon the observability of inputs to the valuation of an asset or liability as of the measurement date. The three levels are defined as follows: • Level 1—inputs to the valuation methodology are observable and reflect quoted prices (unadjusted) for identical assets or liabilities in active markets. Currently, the types of financial instruments the Company generally includes in this category are exchange-traded derivatives; • Level 2—inputs to the valuation methodology other than quoted prices included in Level 1 are observable for the asset or liability, either directly or indirectly. Currently, the types of financial instruments that the Company generally includes in this category are Agency RMBS, U.S. Treasury securities, certain non-Agency RMBS, and actively traded derivatives such as TBAs, interest rate swaps, and swaptions; and • Level 3—inputs to the valuation methodology are unobservable and significant to the fair value measurement. Currently, this category includes certain RMBS, such as certain non-Agency RMBS and certain Agency interest only securities, or "IOs," where there is less price transparency. For certain financial instruments, the various inputs that management uses to measure fair value may fall into different levels of the fair value hierarchy. For each such financial instrument, the determination of which category within the fair value hierarchy is appropriate is based on the lowest level of input that is significant to the fair value measurement. ASC 820 prioritizes the various inputs that management uses to measure fair value, with the highest priority given to inputs that are observable and reflect quoted prices (unadjusted) for identical assets or liabilities in active markets (Level 1), and the lowest priority given to inputs that are unobservable and significant to the fair value measurement (Level 3). The assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the financial instrument. The Company may use valuation techniques consistent with the market and income approaches to measure the fair value of its assets and liabilities. The market approach uses third-party valuations and information obtained from market transactions involving identical or similar assets or liabilities. The income approach uses projections of the future economic benefits of an instrument to determine its fair value, such as in the discounted cash flow methodology. The inputs or methodology used for valuing financial instruments are not necessarily an indication of the risk associated with investing in these financial instruments. The leveling of each financial instrument is reassessed at the end of each period. Transfers between levels of the fair value hierarchy are assumed to occur at the end of the reporting period. Summary Valuation Techniques For financial instruments that are traded in an "active market," the best measure of fair value is the quoted market price. However, many of the Company's financial instruments are not traded in an active market. Therefore, management generally uses third-party valuations when available. If third-party valuations are not available, management uses other valuation techniques, such as the discounted cash flow methodology. The following are summary descriptions, for the various categories of financial instruments, of the valuation methodologies management uses in determining fair value of the Company's financial instruments in such categories. Management utilizes such methodologies to assign a fair value (the estimated price that, in an orderly transaction at the valuation date, would be received to sell an asset, or paid to transfer a liability, as the case may be) to each such financial instrument. For the Company's RMBS investments and TBAs, management seeks to obtain at least one third-party valuation, and often obtains multiple valuations when available. Management has been able to obtain third-party valuations on the vast majority of these instruments and expects to continue to solicit third-party valuations in the future. Management generally values each financial instrument at the average of third-party valuations received and not rejected as described below. Third-party valuations are not binding, management may adjust the valuations it receives (e.g., downward adjustments for odd lots), and management may challenge or reject a valuation when, based on its validation criteria, management determines that such valuation is unreasonable or erroneous. Furthermore, based on its validation criteria, management may determine that the average of the third-party valuations received for a given instrument does not result in what management believes to be the fair value of such instrument, and in such circumstances management may override this average with its own good faith valuation. The validation criteria may take into account output from management's own models, recent trading activity in the same or similar instruments, and valuations received from third parties. The use of proprietary models requires the use of a significant amount of judgment and the application of various assumptions including, but not limited to, assumptions concerning future prepayment rates and default rates. Given their relatively high level of price transparency, Agency RMBS pass-throughs and TBAs are typically designated as Level 2 assets. Non-Agency RMBS and Agency interest only and inverse interest only RMBS are generally classified as either Level 2 or Level 3 based on the analysis of available market data and/or third-party valuations. Furthermore, the methodology used by the third-party valuation providers is reviewed at least annually by management, so as to ascertain whether such providers are utilizing observable market data to determine the valuations that they provide. Interest rate swaps and swaptions are typically valued based on internal models that use observable market data, including applicable interest rates in effect as of the measurement date; the model-generated valuations are then typically compared to counterparty valuations for reasonableness. These financial derivatives are generally designated as Level 2 instruments. In valuing its derivatives, the Company also considers the creditworthiness of both the Company and its counterparties, along with collateral provisions contained in each derivative agreement. The Company's repurchase and reverse repurchase agreements are carried at cost, which approximates fair value. Repurchase agreements and reverse repurchase agreements are classified as Level 2 assets and liabilities based on the adequacy of the collateral and their short term nature. The Company's valuation process, including the application of validation criteria, is overseen by the Manager's Valuation Committee ("Valuation Committee"). The Valuation Committee includes senior level executives from various departments within the Manager, and each quarter the Valuation Committee reviews and approves the valuations of the Company's investments. The valuation process also includes a monthly review by the Company's third party administrator. The goal of this review is to replicate various aspects of the Company's valuation process based on the Company's documented procedures. Because of the inherent uncertainty of valuation, the estimated fair value of the Company's financial instruments may differ significantly from the values that would have been used had a ready market for the financial instruments existed, and the differences could be material to the consolidated financial statements.
Accounting for Securities	Accounting for Securities: Purchases and sales of securities are recorded on trade date and realized and unrealized gains and losses are calculated based on identified cost. The Company has chosen to make a fair value election pursuant to ASC 825-10, Financial Instruments , for its securities portfolio. Electing the fair value option allows the Company to record changes in fair value in the Consolidated Statement of Operations, which, in management's view, more appropriately reflects the results of operations for a particular reporting period as all securities activities will be recorded in a similar manner. As such, securities are recorded at fair value on the Consolidated Balance Sheet and the period change in fair value is recorded in current period earnings on the Consolidated Statement of Operations as a component of Change in net unrealized gains (losses) on securities. The Company evaluates the cost basis of its Agency IOs and non-Agency RMBS for other-than-temporary impairment, or "OTTI," on at least a quarterly basis. When the fair value of a security is less than its amortized cost basis as of the balance sheet date, the security is considered impaired, and the impairment is designated as either temporary or other-than-temporary. When a security's cost basis is impaired, an OTTI is considered to have occurred if (i) the Company intends to sell the security (i.e., a decision has been made as of the reporting date), (ii) it is more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis, or (iii) the Company does not expect to recover the security's amortized cost basis, even if the Company does not intend to sell the security and it is not more likely than not that the Company will be required to sell the security. If any of these conditions exist as of the financial reporting date, the entire amount of the impairment loss, if any, is recognized in earnings as a realized loss and the cost basis of the security is adjusted. Any resulting OTTI adjustments made to the amortized cost basis of the security are reflected in Net realized gains (losses) on securities, on the Consolidated Statement of Operations.
Interest Income	Interest Income: Coupon interest income on investment securities is accrued based on the outstanding principal balance or notional amount and the current coupon rate on each security. The Company amortizes purchase premiums and accretes purchase discounts on its fixed-income securities. For RMBS that are deemed to be of high credit quality at the time of purchase, premiums and discounts are generally amortized/accreted into interest income over the life of such securities using the effective interest method. For such RMBS whose cash flows vary depending on prepayments, an effective yield retroactive to the time of purchase is periodically recomputed based on actual prepayments and changes in projected prepayment activity, and a catch-up adjustment, or "Catch-up Premium Amortization Adjustment," is made to amortization to reflect the cumulative impact of the change in effective yield. For RMBS that are deemed not to be of high credit quality at the time of purchase, interest income is recognized based on the effective interest method. For purposes of determining the effective interest rate, management estimates the future expected cash flows of its investment holdings based on assumptions including, but not limited to, assumptions for future prepayment rates, default rates, and loss severities (each of which may in turn incorporate various macro-economic assumptions, such as future housing prices). These assumptions are re-evaluated not less than quarterly. Principal write-offs are generally treated as realized losses. Changes in projected cash flows, as applied to the current amortized cost of the security, may result in a prospective change in the yield/interest income recognized on such securities. The Company's accretion of discounts and amortization of premiums on securities for U.S. federal and other tax purposes is likely to differ from the accounting treatment under U.S. GAAP of these items as described above.
Cash and Cash Equivalents	Cash and Cash Equivalents: Cash and cash equivalents include cash and short term investments with original maturities of three months or less at the date of acquisition. Cash and cash equivalents typically include amounts held in an interest bearing overnight account and amounts held in money market funds, and these balances generally exceed insured limits. The Company holds its cash at institutions that it believes to be highly creditworthy.
Deposits with Dealers Held as Collateral/Due to Brokers	Due from brokers/Due to brokers: Due from brokers and Due to brokers accounts on the Consolidated Balance Sheet include collateral transferred to or received from counterparties, including clearinghouses, along with receivables and payables for open and/or closed derivative positions.
Financial Derivatives	Financial Derivatives: The Company enters into various types of financial derivatives subject to its investment guidelines, which include restrictions associated with maintaining its qualification as a REIT. The Company's financial derivatives are predominantly subject to bilateral collateral arrangements or clearing in accordance with the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010. The Company may be required to deliver or may receive cash or securities as collateral upon entering into derivative transactions. In addition, changes in the relative value of financial derivative transactions may require the Company or the counterparty to post or receive additional collateral. In the case of cleared financial derivatives, the clearinghouse becomes the Company's counterparty and a futures commission merchant acts as intermediary between the Company and the clearinghouse with respect to all facets of the related transaction, including the posting and receipt of required collateral. Collateral received by the Company is reflected on the Consolidated Balance Sheet as "Due to Brokers." Conversely, collateral posted by the Company is reflected as "Due from Brokers" on the Consolidated Balance Sheet. The types of financial derivatives that have been utilized by the Company to date are interest rate swaps, TBAs, swaptions, and futures. Swaps: The Company enters into interest rate swaps. Interest rate swaps are contractual agreements whereby one party pays a floating interest rate on a notional principal amount and receives a fixed-rate payment on the same notional principal, or vice versa, for a fixed period of time. The Company enters into interest rate swap contracts primarily to mitigate interest rate risk. The Company is subject to interest rate risk exposure in the normal course of pursuing its investment objectives. Swaps change in value with movements in interest rates or total return of the reference securities. During the term of swap contracts, changes in value are recognized as unrealized gains or losses on the Consolidated Statement of Operations. When a contract is terminated, the Company realizes a gain or loss equal to the difference between the proceeds from (or cost of) the closing transaction and the Company's basis in the contract, if any. Periodic payments or receipts required by swap agreements are recorded as unrealized gains or losses when accrued and realized gains or losses when received or paid. Upfront payments paid and/or received by the Company to open swap contracts are recorded as an asset and/or liability on the Consolidated Balance Sheet and are recorded as a realized gain or loss on the termination date. TBA Securities: The Company transacts in the forward settling TBA market. A TBA position is a forward contract for the purchase ("long position") or sale ("short position") of Agency RMBS at a predetermined price, face amount, issuer, coupon, and maturity on an agreed-upon future delivery date. For each TBA contract and delivery month, a uniform settlement date for all market participants is determined by the Securities Industry and Financial Markets Association. The specific Agency RMBS to be delivered into the contract at the settlement date are not known at the time of the transaction. The Company typically does not take delivery of TBAs, but rather enters into offsetting transactions and settles the associated receivable and payable balances with its counterparties. The Company uses TBAs to mitigate interest rate risk, usually by taking short positions. The Company also invests in TBAs as a means of acquiring additional exposure to Agency RMBS, or for speculative purposes, including holding long positions. TBAs are accounted for by the Company as financial derivatives. The difference between the contract price and the fair value of the TBA position as of the reporting date is included in Change in net unrealized gains (losses) on financial derivatives in the Consolidated Statement of Operations. Upon settlement of the TBA contract, the realized gain (loss) on the TBA contract is equal to the net cash amount received (paid). Options : The Company enters into swaption contracts. It may purchase or write put, call, straddle, or other similar options contracts. The Company enters into options contracts primarily to help mitigate interest rate risk. When the Company purchases an options contract, the option asset is initially recorded at an amount equal to the premium paid, if any, and is subsequently marked-to-market. Premiums paid for purchasing options contracts that expire unexercised are recognized on the expiration date as realized losses. If an options contract is exercised, the premium paid is subtracted from the proceeds of the sale or added to the cost of the purchase to determine whether the Company has realized a gain or loss on the related investment transaction. When the Company writes an options contract, the option liability is initially recorded at an amount equal to the premium received, if any, and is subsequently marked-to-market. Premiums received for writing options contracts that expire unexercised are recognized on the expiration date as realized gains. If an options contract is exercised, the premium received is subtracted from the cost of the purchase or added to the proceeds of the sale to determine whether the Company has realized a gain or loss on the related investment transaction. When the Company enters into a closing transaction, the Company will realize a gain or loss depending upon whether the amount from the closing transaction is greater or less than the premiums paid or received. In general, the Company's options contracts contain forward-settling premiums. In this case, no money is exchanged upfront; instead, the agreed-upon premium is paid by the buyer upon expiration of the options contract, regardless of whether or not the options contract is exercised. Unrealized gains or (losses) resulting from the options contract being marked-to-market are included in Change in net unrealized gains (losses) on financial derivatives in the Consolidated Statement of Operations. Realized gains or (losses) are included in Realized gains (losses) on financial derivatives in the Consolidated Statement of Operations. Futures Contracts : The Company enters into Eurodollar futures contracts and U.S. Treasury futures contracts. A futures contract is an exchange-traded agreement to buy or sell an asset for a set price on a future date. Initial margin deposits are made upon entering into futures contracts and can be either in the form of cash or securities. During the period the futures contract is open, changes in the value of the contract are recognized as unrealized gains or losses by marking-to-market to reflect the current market value of the contract. Unrealized gains or (losses) are included in Change in net unrealized gains (losses) on financial derivatives in the Consolidated Statement of Operations. Variation margin payments are made or received periodically, depending upon whether unrealized losses or gains are incurred. When the contract is closed, the Company records a realized gain or loss equal to the difference between the proceeds of the closing transaction and the Company's basis in the contract. Realized gains or (losses) are included in Realized gains (losses) on financial derivatives in the Consolidated Statement of Operations. Financial derivative assets are included in Financial derivatives–assets, at fair value on the Consolidated Balance Sheet while financial derivative liabilities are included in Financial derivatives–liabilities, at fair value on the Consolidated Balance Sheet.
Repurchase Agreements	Repurchase Agreements: The Company enters into repurchase agreements with third-party broker-dealers, whereby it sells securities under agreements to repurchase at an agreed upon price and date. The Company accounts for repurchase agreements as collateralized borrowings, with the initial sale price representing the amount borrowed, and with the future repurchase price consisting of the amount borrowed plus interest, at the implied interest rate of the repurchase agreement, on the amount borrowed over the term of the repurchase agreement. The interest rate on a repurchase agreement is based on competitive market rates (or competitive market spreads, in the case of agreements with floating interest rates) at the time such agreement is entered into. When the Company enters into a repurchase agreement, the lender establishes and maintains an account containing cash and/or securities having a value not less than the repurchase price, including accrued interest, of the repurchase agreement. Repurchase agreements are carried at their contractual amounts, which approximate fair value due to their short-term nature.
Reverse Repurchase Agreements	Reverse Repurchase Agreements: The Company enters into reverse repurchase agreement transactions with third-party broker-dealers, whereby it purchases securities under agreements to resell at an agreed upon price and date. The interest rate on a reverse repurchase agreement is based on competitive market rates (or competitive market spreads, in the case of agreements with floating interest rates) at the time such agreement is entered into. Reverse repurchase agreements are carried at their contractual amounts, which approximate fair value due to their short-term nature. Repurchase and reverse repurchase agreements that are conducted with the same counterparty can be reported on a net basis if they meet the requirements of ASC 210-20, Balance Sheet Offsetting . There are currently no repurchase and reverse repurchase agreements reported on a net basis in the Company's consolidated financial statements.
Securities Sold Short	Securities Sold Short: The Company may purchase or engage in short sales of U.S. Treasury securities to mitigate the potential impact of changes in interest rates on the performance of its portfolio. When the Company sells securities short, it typically satisfies its security delivery settlement obligation by borrowing or purchasing the security sold short from the same or a different counterparty. When borrowing a security sold short from a counterparty, the Company generally is required to deliver cash or securities to such counterparty as collateral for the Company's obligation to return the borrowed security. The Company has chosen to make the fair value election pursuant to ASC 825-10, Financial Instruments , for its securities sold short. Electing the fair value option allows the Company to record changes in fair value in the Consolidated Statement of Operations, which, in management's view, more appropriately reflects the results of operations for a particular reporting period as all securities activities will be recorded in a similar manner. As such, securities sold short are recorded at fair value on the Consolidated Balance Sheet and the period change in fair value is recorded in current period earnings on the Consolidated Statement of Operations as a component of Change in net unrealized gains (losses) on securities. A realized gain or loss will be recognized upon the termination of a short sale if the market price is less or greater than the original sale price. Such realized gain or loss is recorded on the Company's Consolidated Statement of Operations in Net realized gains (losses) on securities.
Offering Costs/Deferred Offering Costs/Underwriters' Discounts	Offering Costs/Deferred Offering Costs/Underwriters' Discounts: Offering costs, underwriters' discounts and commissions and fees, are charged against shareholders' equity within Additional paid-in-capital. Offering costs typically include legal, accounting, and other fees associated with the cost of raising equity capital.
Share Based Compensation	Share Based Compensation: The Company applies the provisions of ASC 718, Compensation—Stock Compensation ("ASC 718"), with regard to its equity incentive plan. ASC 718 covers a wide range of share-based compensation arrangements including share options, restricted share plans, performance-based awards, share appreciation rights, and employee share purchase plans. ASC 718 requires that compensation cost relating to share-based payment transactions be recognized in the financial statements. The cost is measured based on the fair value, at the grant date, of the equity or liability instruments issued and is amortized over the vesting period. Restricted shares issued to the Company's independent trustees and partially dedicated personnel are participating securities and receive dividends prior to vesting. Fair value for such awards is based on the closing stock price on the New York Stock Exchange at the grant date. The vesting period for restricted share awards is typically one to two years . Shares issued to the Company's independent trustees and partially dedicated personnel are subject to tax withholding upon vesting. The Company's independent trustees and partially dedicated personnel are permitted to forfeit a portion of their vested shares to pay such withholding tax. Forfeited shares decrease the total number of shares issued and outstanding and are immediately retired upon settlement.
Dividends	Dividends: Dividends payable are recorded on the declaration date.
Expenses	Expenses: Expenses are recognized as incurred on the Consolidated Statement of Operations.
Earnings Per Share	Earnings Per Share: In accordance with the provisions of ASC 260, Earnings per Share , the Company calculates basic income (loss) per share by dividing net income (loss) for the period by the weighted average of the Company's common shares outstanding for that period. Diluted income (loss) per share takes into account the effect of dilutive instruments, such as share options and warrants, and uses the average share price for the period in determining the number of incremental shares that are to be added to the weighted average number of shares outstanding.
Share Repurchases	Share Repurchases: Common shares that are repurchased by the Company subsequent to issuance are immediately retired upon settlement and decrease the total number of shares issued and outstanding. The cost of such share repurchases is charged against Additional paid-in-capital on the Company's Consolidated Balance Sheet.
Income Taxes	Income Taxes: The Company has elected to be taxed as a REIT under Sections 856 through 860 of the Code. As a REIT, the Company is generally not subject to corporate-level federal and state income tax on net income it distributes to its shareholders within the prescribed timeframes. To qualify as a REIT, the Company must meet a number of organizational and operational requirements, including distributing at least 90% of its annual taxable income to shareholders. Even if the Company qualifies as a REIT, it may be subject to certain federal, state, local and foreign taxes on its income and property, and to federal income and excise taxes on its undistributed taxable income. If the Company fails to qualify as a REIT, and does not qualify for certain statutory relief provisions, it will be subject to U.S. federal, state, and local income taxes and may be precluded from qualifying as a REIT for the four taxable years following the year in which the Company fails to qualify as a REIT. The Company follows the authoritative guidance on accounting for and disclosure of uncertainty on tax positions, which requires management to determine whether a tax position of the Company is more likely than not to be sustained upon examination by the applicable taxing authority, including resolution of any related appeals or litigation processes, based on the technical merits of the position. For uncertain tax positions, the tax benefit to be recognized is measured as the largest amount of benefit that is greater than 50% likely of being realized upon ultimate settlement. The Company did not have any unrecognized tax benefits resulting from tax positions related to the current period or its open tax years. In the normal course of business, the Company may be subject to examination by federal, state, local, and foreign jurisdictions, where applicable, for the current period and its open tax years. The Company may take positions with respect to certain tax issues which depend on legal interpretation of facts or applicable tax regulations. Should the relevant tax regulators successfully challenge any of such positions, the Company might be found to have a tax liability that has not been recorded in the accompanying consolidated financial statements. Also, management's conclusions regarding the authoritative guidance may be subject to review and adjustment at a later date based on changing tax laws, regulations, and interpretations thereof. There were no amounts accrued for penalties or interest as of or during the periods presented in these consolidated financial statements.
Recent Accounting Pronouncements	Recent Accounting Pronouncements : In August 2018, the Financial Accounting Standards Board, or "FASB," issued ASU 2018-13, Fair Value Measurement—Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement ("ASU 2018-13"). This amends ASC 820, Fair Value Measurement , to remove or modify various current disclosure requirements related to fair value measurement. Additionally ASU 2018-13 requires certain additional disclosures around fair value measurement. ASU 2018-13 is effective for annual periods beginning after December 15, 2019 and interim periods within those years, with early adoption permitted. Entities are permitted to early adopt any removed or modified disclosures and delay adoption of the additional disclosures until their effective date. The Company has elected to early adopt the removal and modification of various disclosure requirements in accordance with ASU 2018-13; early adoption has not had a material impact on the Company's consolidated financial statements. The Company has elected not to early adopt the additional disclosure requirements. The adoption of the additional disclosure requirements, as required under ASU 2018-13, is not expected to have a material impact on the Company's consolidated financial statements. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows—Classification of Certain Cash Receipts and Cash Payments ("ASU 2016-15"). This amends ASC 230, Statement of Cash Flows , to clarify how certain cash receipts and payments should be classified on the statement of cash flows. The updates that most affect the Company relate to classifying each separately identifiable source or use within the cash receipts and cash payments on the basis of the nature of the underlying cash flows and identifying such receipts and payments as operating, investing, or financing activities. The adoption of ASU 2016-15 did not have a material impact on the Company's consolidated financial statements and has been retrospectively applied.

Mortgage-Backed Securities (Tab

Mortgage-Backed Securities (Tables)	9 Months Ended
	Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract]
Mortgage-backed securities [Table Text Block]	The following tables present details of the Company's mortgage-backed securities portfolio at September 30, 2019 and December 31, 2018, respectively. The Company's Agency RMBS include mortgage pass-through certificates and CMOs representing interests in or obligations backed by pools of residential mortgage loans issued or guaranteed by a U.S. government agency or government-sponsored enterprise, or "GSE." The non-Agency RMBS portfolio is not issued or guaranteed by the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation, or any agency of the U.S. Government and is therefore subject to greater credit risk. By RMBS Type September 30, 2019 : ($ in thousands) Gross Unrealized Weighted Average Current Principal Unamortized Premium (Discount) Amortized Cost Gains Losses Fair Value Coupon (1) Yield Life (2) Agency RMBS: 15-year fixed-rate mortgages $ 153,142 $ 2,771 $ 155,913 $ 4,193 $ (94 ) $ 160,012 3.46% 2.94% 4.11 20-year fixed-rate mortgages 17,251 742 17,993 355 — 18,348 4.54% 3.37% 4.04 30-year fixed-rate mortgages 996,703 47,996 1,044,699 17,757 (3,537 ) 1,058,919 4.21% 3.26% 5.89 Adjustable rate mortgages 36,681 1,193 37,874 339 (101 ) 38,112 3.85% 2.27% 2.83 Reverse mortgages 89,444 7,080 96,524 1,946 (34 ) 98,436 4.60% 2.85% 5.74 Interest only securities n/a n/a 12,144 54 (633 ) 11,565 3.03% 2.99% 3.31 Total Agency RMBS 1,293,221 59,782 1,365,147 24,644 (4,399 ) 1,385,392 4.03% 3.17% 5.32 Non-Agency RMBS 11,128 (4,084 ) 7,044 2,132 — 9,176 3.91% 11.38% 5.88 Total RMBS $ 1,304,349 $ 55,698 $ 1,372,191 $ 26,776 $ (4,399 ) $ 1,394,568 4.03% 3.21% 5.33 (1) Weighted average coupon represents the weighted average pass-through rates of the securities rather than the weighted average gross mortgage rates of the underlying collateral. (2) Average lives of RMBS are generally shorter than stated contractual maturities. Average lives are affected by the contractual maturities of the underlying mortgages, scheduled periodic payments of principal, and unscheduled prepayments of principal. December 31, 2018 : ($ in thousands) Gross Unrealized Weighted Average Current Principal Unamortized Premium (Discount) Amortized Cost Gains Losses Fair Value Coupon (1) Yield Life (Years) (2) Agency RMBS: 15-year fixed-rate mortgages $ 135,537 $ 3,307 $ 138,844 $ 655 $ (1,968 ) $ 137,531 3.56% 2.88% 4.90 20-year fixed-rate mortgages 7,267 575 7,842 — (337 ) 7,505 4.00% 2.53% 5.88 30-year fixed-rate mortgages 1,237,047 57,470 1,294,517 2,731 (23,734 ) 1,273,514 4.22% 3.48% 8.10 Adjustable rate mortgages 17,752 1,217 18,969 1 (727 ) 18,243 4.02% 2.63% 3.90 Reverse mortgages 70,991 6,331 77,322 5 (1,423 ) 75,904 4.61% 2.90% 5.58 Interest only securities n/a n/a 16,740 951 (1,325 ) 16,366 4.41% 9.00% 4.24 Total Agency RMBS 1,468,594 68,900 1,554,234 4,343 (29,514 ) 1,529,063 4.19% 3.45% 7.38 Non-Agency RMBS 13,755 (4,324 ) 9,431 1,806 (4 ) 11,233 4.38% 12.59% 5.69 Total RMBS $ 1,482,349 $ 64,576 $ 1,563,665 $ 6,149 $ (29,518 ) $ 1,540,296 4.19% 3.50% 7.37 (1) Weighted average coupon represents the weighted average pass-through rates of the securities rather than the weighted average gross mortgage rates of the underlying collateral. (2) Average lives of RMBS are generally shorter than stated contractual maturities. Average lives are affected by the contractual maturities of the underlying mortgages, scheduled periodic payments of principal, and unscheduled prepayments of principal.
Weighted Average Life Classifications [Table Text Block]	By Estimated Weighted Average Life As of September 30, 2019 : ($ in thousands) Agency RMBS Agency Interest Only Securities Non-Agency RMBS Estimated Weighted Average Life (1) Fair Value Amortized Cost Weighted Average Coupon (2) Fair Value Amortized Cost Weighted Average Coupon (2) Fair Value Amortized Cost Weighted Average Coupon (2) Less than three years $ 142,482 $ 140,888 4.78 % $ 4,824 $ 5,306 4.32 % $ 4,210 $ 4,022 5.47 % Greater than three years and less than seven years 842,206 827,820 4.17 % 6,741 6,838 2.17 % 823 282 4.05 % Greater than seven years and less than eleven years 387,146 382,390 3.87 % — — — % 4,143 2,740 2.52 % Greater than eleven years 1,993 1,905 3.50 % — — — % — — — % Total $ 1,373,827 $ 1,353,003 4.15 % $ 11,565 $ 12,144 3.03 % $ 9,176 $ 7,044 3.91 % (1) Average lives of RMBS are generally shorter than stated contractual maturities. (2) Weighted average coupon represents the weighted average pass-through rates of the securities rather than the weighted average gross mortgage rates of the underlying collateral. As of December 31, 2018: ($ in thousands) Agency RMBS Agency Interest Only Securities Non-Agency RMBS Estimated Weighted Average Life (1) Fair Value Amortized Cost Weighted Average Coupon (2) Fair Value Amortized Cost Weighted Average Coupon (2) Fair Value Amortized Cost Weighted Average Coupon (2) Less than three years $ 12,667 $ 12,796 4.69 % $ 1,129 $ 1,671 4.41 % $ 4,635 $ 3,975 4.96 % Greater than three years and less than seven years 394,733 399,895 4.26 % 15,237 15,069 4.41 % 2,500 2,366 5.89 % Greater than seven years and less than eleven years 1,086,032 1,105,538 4.14 % — — — % 4,098 3,090 2.99 % Greater than eleven years 19,265 19,265 4.10 % — — — % — — — % Total $ 1,512,697 $ 1,537,494 4.17 % $ 16,366 $ 16,740 4.41 % $ 11,233 $ 9,431 4.38 % (1) Average lives of RMBS are generally shorter than stated contractual maturities. (2) Weighted average coupon represents the weighted average pass-through rates of the securities rather than the weighted average gross mortgage rates of the underlying collateral.
Interest Income Components - Investments [Table Text Block]	The following tables reflect the components of interest income on the Company's RMBS for the three- and nine-month periods ended September 30, 2019 and 2018: Three-Month Period Ended September 30, 2019 Nine-Month Period Ended September 30, 2019 ($ in thousands) Coupon Interest Net Amortization Interest Income Coupon Interest Net Amortization Interest Income Agency RMBS $ 14,941 $ (5,097 ) $ 9,844 $ 46,893 $ (13,452 ) $ 33,441 Non-Agency RMBS 110 81 191 331 344 675 Total $ 15,051 $ (5,016 ) $ 10,035 $ 47,224 $ (13,108 ) $ 34,116 Three-Month Period Ended Nine-Month Period Ended ($ in thousands) Coupon Interest Net Amortization Interest Income Coupon Interest Net Amortization Interest Income Agency RMBS $ 16,744 $ (4,029 ) $ 12,715 $ 50,341 $ (11,485 ) $ 38,856 Non-Agency RMBS 362 44 406 680 282 962 Total $ 17,106 $ (3,985 ) $ 13,121 $ 51,021 $ (11,203 ) $ 39,818

Valuation (Tables)

Valuation (Tables)	9 Months Ended
	Sep. 30, 2019
Fair Value Disclosures [Abstract]
Schedule of Fair Value Measurements	The following tables present the Company's financial instruments measured at fair value on: September 30, 2019 : (In thousands) Description Level 1 Level 2 Level 3 Total Assets: Mortgage-backed securities, at fair value: Agency RMBS: 15-year fixed-rate mortgages $ — $ 160,012 $ — $ 160,012 20-year fixed-rate mortgages — 18,348 — 18,348 30-year fixed-rate mortgages — 1,058,919 — 1,058,919 Adjustable rate mortgages — 38,112 — 38,112 Reverse mortgages — 98,436 — 98,436 Interest only securities — 5,150 6,415 11,565 Non-Agency RMBS — 6,882 2,294 9,176 Mortgage-backed securities, at fair value — 1,385,859 8,709 1,394,568 Financial derivatives–assets, at fair value: TBAs — 384 — 384 Interest rate swaps — 91 — 91 Total financial derivatives–assets, at fair value — 475 — 475 Total mortgage-backed securities and financial derivatives–assets, at fair value $ — $ 1,386,334 $ 8,709 $ 1,395,043 Liabilities: U.S. Treasury securities sold short, at fair value $ — $ (37,835 ) $ — $ (37,835 ) Financial derivatives–liabilities, at fair value: TBAs — (307 ) — (307 ) Interest rate swaps — (19,458 ) — (19,458 ) Futures (121 ) — — (121 ) Total financial derivatives–liabilities, at fair value (121 ) (19,765 ) — (19,886 ) Total U.S. Treasury securities sold short and financial derivatives–liabilities, at fair value $ (121 ) $ (57,600 ) $ — $ (57,721 ) December 31, 2018 : (In thousands) Description Level 1 Level 2 Level 3 Total Assets: Mortgage-backed securities, at fair value: Agency RMBS: 15-year fixed-rate mortgages $ — $ 137,531 $ — $ 137,531 20-year fixed-rate mortgages — 7,505 — 7,505 30-year fixed-rate mortgages — 1,273,514 — 1,273,514 Adjustable rate mortgages — 18,243 — 18,243 Reverse mortgages — 75,904 — 75,904 Interest only securities — 13,534 2,832 16,366 Non-Agency RMBS — 6,599 4,634 11,233 Mortgage-backed securities, at fair value — 1,532,830 7,466 1,540,296 Financial derivatives–assets, at fair value: TBAs — 794 — 794 Interest rate swaps — 11,045 — 11,045 Total financial derivatives–assets, at fair value — 11,839 — 11,839 Total mortgage-backed securities and financial derivatives–assets, at fair value $ — $ 1,544,669 $ 7,466 $ 1,552,135 Liabilities: U.S. Treasury securities sold short, at fair value $ — $ (374 ) $ — $ (374 ) Financial derivatives–liabilities, at fair value: TBAs — (2,536 ) — (2,536 ) Interest rate swaps — (6,193 ) — (6,193 ) Futures (7,830 ) — — (7,830 ) Total financial derivatives–liabilities, at fair value (7,830 ) (8,729 ) — (16,559 ) Total U.S. Treasury securities sold short and financial derivatives–liabilities, at fair value $ (7,830 ) $ (9,103 ) $ — $ (16,933 )
Unobservable Input Reconciliation	The following tables present additional information about the Company's investments which are measured at fair value for which the Company has utilized Level 3 inputs to determine fair value. Three-month period ended September 30, 2019 : (In thousands) Non-Agency RMBS Agency RMBS Beginning balance as of June 30, 2019 $ 2,360 $ 4,950 Purchases — 1,771 Proceeds from sales — — Principal repayments (101 ) — (Amortization)/accretion, net 85 (496 ) Net realized gains (losses) — (557 ) Change in net unrealized gains (losses) (50 ) (120 ) Transfers: Transfers into level 3 — 1,138 Transfers out of level 3 — (271 ) Ending balance as of September 30, 2019 $ 2,294 $ 6,415 All amounts of net realized and changes in net unrealized gains (losses) in the table above are reflected in the accompanying Consolidated Statement of Operations. The table above incorporates changes in net unrealized gains (losses) for both Level 3 financial instruments held by the Company at September 30, 2019 , as well as Level 3 financial instruments disposed of by the Company during the three-month period ended September 30, 2019 . For Level 3 financial instruments held by the Company as of September 30, 2019 , change in net unrealized gains (losses) of $(0.1) million and $(0.2) million , for the three-month period ended September 30, 2019 relate to non-Agency RMBS and Agency RMBS, respectively. At September 30, 2019 , the Company transferred $0.3 million of RMBS from Level 3 to Level 2 and $1.1 million of RMBS from Level 2 to Level 3. Transfers between hierarchy levels are based on the availability of sufficient observable inputs to meet Level 2 versus Level 3 criteria. The level designation of each financial instrument is reassessed at the end of each period, and is based on pricing information received from third party pricing sources. Three-month period ended September 30, 2018: (In thousands) Non-Agency RMBS Agency RMBS Beginning balance as of June 30, 2018 $ 6,993 $ 3,626 Purchases — — Proceeds from sales — — Principal repayments (369 ) — (Amortization)/accretion, net 62 (251 ) Net realized gains (losses) — (11 ) Change in net unrealized gains (losses) 289 62 Transfers: Transfers into level 3 658 1,598 Transfers out of level 3 — (916 ) Ending balance as of September 30, 2018 $ 7,633 $ 4,108 All amounts of net realized and changes in net unrealized gains (losses) in the table above are reflected in the accompanying Consolidated Statement of Operations. The table above incorporates changes in net unrealized gains (losses) for both Level 3 financial instruments held by the Company at September 30, 2018, as well as Level 3 financial instruments disposed of by the Company during the three-month period ended September 30, 2018. For Level 3 financial instruments held by the Company as of September 30, 2018, change in net unrealized gains (losses) of $0.3 million and $0.2 million , for the three-month period ended September 30, 2018 relate to non-Agency RMBS and Agency RMBS, respectively. At September 30, 2018, the Company transferred $0.9 million of RMBS from Level 3 to Level 2 and $2.3 million of RMBS from Level 2 to Level 3. Transfers between these hierarchy levels were based on the availability of sufficient observable inputs to meet Level 2 versus Level 3 criteria. The level designation of each financial instrument is reassessed at the end of each period, and is based on pricing information received from third party pricing sources. Nine-month period ended September 30, 2019 : (In thousands) Non-Agency RMBS Agency RMBS Beginning balance as of December 31, 2018 $ 4,634 $ 2,832 Purchases — 1,771 Proceeds from sales (1,372 ) — Principal repayments (704 ) — (Amortization)/accretion, net 257 (769 ) Net realized gains (losses) 55 (965 ) Change in net unrealized gains (losses) 160 534 Transfers: Transfers into level 3 — 3,680 Transfers out of level 3 (736 ) (668 ) Ending balance as of September 30, 2019 $ 2,294 $ 6,415 All amounts of net realized and changes in net unrealized gains (losses) in the table above are reflected in the accompanying Consolidated Statement of Operations. The table above incorporates changes in net unrealized gains (losses) for both Level 3 financial instruments held by the Company at September 30, 2019 , as well as Level 3 financial instruments disposed of by the Company during the nine-month period ended September 30, 2019 . For Level 3 financial instruments held by the Company as of September 30, 2019 , change in net unrealized gains (losses) of $0.2 million and $(0.3) million , for the nine-month period ended September 30, 2019 relate to non-Agency RMBS and Agency RMBS, respectively. At September 30, 2019 , the Company transferred $1.4 million of RMBS from Level 3 to Level 2 and $3.7 million of RMBS from Level 2 to Level 3. Transfers between hierarchy levels are based on the availability of sufficient observable inputs to meet Level 2 versus Level 3 criteria. The level designation of each financial instrument is reassessed at the end of each period, and is based on pricing information received from third party pricing sources. Nine-month period ended September 30, 2018 : (In thousands) Non-Agency RMBS Agency RMBS Beginning balance as of December 31, 2017 $ 8,832 $ 2,254 Purchases — 160 Proceeds from sales (3,638 ) — Principal repayments (593 ) — (Amortization)/accretion, net 197 (884 ) Net realized gains (losses) 1,254 (177 ) Change in net unrealized gains (losses) (660 ) 536 Transfers: Transfers into level 3 2,241 2,219 Transfers out of level 3 — — Ending balance as of September 30, 2018 $ 7,633 $ 4,108 All amounts of net realized and changes in net unrealized gains (losses) in the table above are reflected in the accompanying Consolidated Statement of Operations. The table above incorporates changes in net unrealized gains (losses) for both Level 3 financial instruments held by the Company as of September 30, 2018 , as well as Level 3 financial instruments disposed of by the Company during the nine-month period ended September 30, 2018 . For Level 3 financial instruments held by the Company as of September 30, 2018 , change in net unrealized gains (losses) of $0.3 million and $0.7 million , for the nine-month period ended September 30, 2018 relate to non-Agency RMBS and Agency RMBS, respectively. At September 30, 2018 , the Company transferred $4.5 million of RMBS from Level 2 to Level 3. Transfers between these hierarchy levels are based on the availability of sufficient observable inputs to meet Level 2 versus Level 3 criteria. The level designation of each financial instrument is reassessed at the end of each period, and is based on pricing information received from third party pricing sources.
Quantitative Information	The following tables identify the significant unobservable inputs that affect the valuation of the Company's Level 3 assets and liabilities as of September 30, 2019 and December 31, 2018: September 30, 2019 : Range Description Fair Value Valuation Technique Significant Unobservable Input Min Max Weighted Average (1) (In thousands) Non-Agency RMBS $ 2,294 Market quotes Non-Binding Third-Party Valuation $ 62.56 $ 90.66 $ 77.12 Agency RMBS–Interest Only Securities 6,415 Option Adjusted Spread ("OAS") LIBOR OAS (2) 77 1,241 374 Projected Collateral Prepayments 46.9 % 87.9 % 80.2 % Projected Collateral Scheduled Amortization 12.1 % 53.1 % 19.8 % 100.0 % (1) Averages are weighted based on the fair value of the related instrument. (2) Shown in basis points. December 31, 2018: Range Description Fair Value Valuation Technique Significant Unobservable Input Min Max Weighted Average (1) (In thousands) Non-Agency RMBS $ 2,745 Market quotes Non-Binding Third-Party Valuation $ 83.59 $ 86.59 $ 85.65 Non-Agency RMBS 1,889 Discounted Cash Flows Yield 3.4 % 5.4 % 4.5 % Projected Collateral Prepayments 50.2 % 66.4 % 56.6 % Projected Collateral Losses 2.3 % 8.6 % 4.9 % Projected Collateral Recoveries 7.5 % 12.3 % 9.6 % Projected Collateral Scheduled Amortization 17.8 % 39.9 % 28.9 % 100.0 % Agency RMBS–Interest Only Securities 2,832 Option Adjusted Spread ("OAS") LIBOR OAS (2) 319 1,439 734 Projected Collateral Prepayments 33.9 % 79.5 % 59.4 % Projected Collateral Scheduled Amortization 20.5 % 66.1 % 40.6 % 100.0 % (1) Averages are weighted based on the fair value of the related instrument. (2) Shown in basis points.
Fair Value, Other Financial Instruments	The following table summarizes the estimated fair value of all other financial instruments not included in the disclosures above as of September 30, 2019 and December 31, 2018: September 30, 2019 December 31, 2018 (In thousands) Fair Value Carrying Value Fair Value Carrying Value Other financial instruments Assets: Cash and cash equivalents $ 50,188 $ 50,188 $ 18,585 $ 18,585 Due from brokers 56,734 56,734 24,051 24,051 Reverse repurchase agreements 43,008 43,008 379 379 Liabilities: Repurchase agreements 1,337,984 1,337,984 1,481,561 1,481,561 Due to brokers 294 294 1,325 1,325 Cash and cash equivalents includes cash held in an interest bearing overnight account, for which fair value equals the carrying value, and cash held in money market accounts, which are liquid in nature and for which fair value equals the carrying value; such assets are considered Level 1 assets. Due from brokers and Due to brokers include collateral transferred to or received from counterparties, along with receivables and payables for open and/or closed derivative positions. These receivables and payables are short term in nature and any collateral transferred consists primarily of cash; fair value of these items approximates carrying value and such items are considered Level 1 assets and liabilities. The Company's repurchase and reverse repurchase agreements are carried at cost, which approximates fair value due to their short term nature. Repurchase agreements and reverse repurchase agreements are classified as Level 2 assets and liabilities based on the adequacy of the collateral and their short term nature.

Derivative Instruments (Tables)

Derivative Instruments (Tables)	9 Months Ended
	Sep. 30, 2019
Derivative Instrument Detail [Abstract]
Schedule of Derivative Instruments [Table Text Block]	The following table details the fair value of the Company's holdings of financial derivatives as of September 30, 2019 and December 31, 2018: September 30, 2019 December 31, 2018 (In thousands) Financial derivatives–assets, at fair value: TBA securities purchase contracts $ 369 $ 794 TBA securities sale contracts 15 — Fixed payer interest rate swaps 86 10,201 Fixed receiver interest rate swaps 5 844 Total financial derivatives–assets, at fair value 475 11,839 Financial derivatives–liabilities, at fair value: TBA securities sale contracts (307 ) (2,536 ) Fixed payer interest rate swaps (19,449 ) (6,190 ) Fixed receiver interest rate swaps (9 ) (3 ) Futures (121 ) (7,830 ) Total financial derivatives–liabilities, at fair value (19,886 ) (16,559 ) Total, net $ (19,411 ) $ (4,720 )
Interest Rate Swaps By Remaining Maturity [Table Text Block]	The following tables provide information about the Company's fixed payer interest rate swaps as of September 30, 2019 and December 31, 2018: September 30, 2019 : Weighted Average Maturity Notional Amount Fair Value Pay Rate Receive Rate Remaining Years to Maturity (In thousands) 2020 $ 86,000 $ (31 ) 1.60 % 2.26 % 0.57 2021 151,606 (2,061 ) 2.11 2.20 1.79 2022 60,100 (857 ) 1.98 2.19 2.63 2023 115,523 (1,897 ) 1.96 2.15 3.85 2024 26,591 (306 ) 1.75 2.22 4.84 2025 105,300 (3,998 ) 2.05 2.10 6.26 2026 12,771 (404 ) 1.93 2.17 7.07 2027 30,000 (1,831 ) 2.29 2.29 7.59 2028 39,807 (4,142 ) 2.80 2.22 8.76 2029 3,849 (77 ) 1.80 2.27 9.82 2036 2,700 (256 ) 2.32 2.16 16.39 2043 12,380 (3,278 ) 2.99 2.18 23.63 2048 630 (225 ) 3.18 2.13 29.18 Total $ 647,257 $ (19,363 ) 2.04 % 2.19 % 4.28 December 31, 2018: Weighted Average Maturity Notional Amount Fair Value Pay Rate Receive Rate Remaining Years to Maturity (In thousands) 2020 $ 86,000 $ 1,390 1.60 % 2.50 % 1.32 2021 165,600 2,099 2.09 2.63 2.52 2022 68,480 1,289 2.00 2.60 3.43 2023 23,600 695 1.88 2.51 4.36 2024 8,900 269 1.99 2.40 5.26 2025 47,722 (202 ) 2.57 2.67 6.17 2026 40,885 2,841 1.63 2.63 7.71 2027 30,000 845 2.29 2.58 8.34 2028 150,563 (4,486 ) 2.97 2.55 9.61 2043 12,380 (338 ) 2.99 2.61 24.38 2048 5,500 (391 ) 3.18 2.69 29.93 Total $ 639,630 $ 4,011 2.26 % 2.58 % 5.77 The following tables provide information about the Company's fixed receiver interest rate swaps as of September 30, 2019 and December 31, 2018. September 30, 2019 : Weighted Average Maturity Notional Amount Fair Value Pay Rate Receive Rate Remaining Years to Maturity (In thousands) 2023 $ 9,940 $ 1 2.09 % 1.53 % 4.01 2024 7,000 4 2.10 1.52 5.01 2029 12,500 (9 ) 2.09 1.57 10.01 Total $ 29,440 $ (4 ) 2.09 % 1.54 % 6.80 December 31, 2018: Weighted Average Maturity Notional Amount Fair Value Pay Rate Receive Rate Remaining Years to Maturity (In thousands) 2023 $ 59,562 $ 406 2.79 % 2.72 % 4.98 2028 18,870 295 2.79 2.89 9.97 2029 9,750 (3 ) 2.81 2.71 10.02 2048 5,000 143 2.78 2.98 29.97 Total $ 93,182 $ 841 2.79 % 2.77 % 7.86
Futures [Table Text Block]	The following tables provide information about the Company's futures as of September 30, 2019 and December 31, 2018. September 30, 2019 : Description Notional Amount Fair Value Remaining Months to Expiration ($ in thousands) U.S. Treasury Futures $ 19,800 $ (121 ) 3.04 December 31, 2018: Description Notional Amount Fair Value Remaining Months to Expiration ($ in thousands) U.S. Treasury Futures $ (301,300 ) $ (7,830 ) 2.76
Schedule of To-be-announced securities (TBAs) [Table Text Block]	As of September 30, 2019 and December 31, 2018, the Company had outstanding contracts to purchase ("long positions") and sell ("short positions") TBA securities as follows: September 30, 2019 December 31, 2018 TBA Securities Notional Amount (1) Cost Basis (2) Market Value (3) Net Carrying Value (4) Notional Amount (1) Cost Basis (2) Market Value (3) Net Carrying Value (4) (In thousands) Purchase contracts: Assets $ 106,465 $ 110,326 $ 110,695 $ 369 $ 95,054 $ 95,967 $ 96,761 $ 794 106,465 110,326 110,695 369 95,054 95,967 96,761 794 Sale contracts: Assets (63,370 ) (65,317 ) (65,302 ) 15 — — — — Liabilities (237,853 ) (247,100 ) (247,407 ) (307 ) (289,012 ) (291,438 ) (293,974 ) (2,536 ) (301,223 ) (312,417 ) (312,709 ) (292 ) (289,012 ) (291,438 ) (293,974 ) (2,536 ) Total TBA securities, net $ (194,758 ) $ (202,091 ) $ (202,014 ) $ 77 $ (193,958 ) $ (195,471 ) $ (197,213 ) $ (1,742 ) (1) Notional amount represents the principal balance of the underlying Agency RMBS. (2) Cost basis represents the forward price to be paid (received) for the underlying Agency RMBS. (3) Market value represents the current market value of the underlying Agency RMBS (on a forward delivery basis) as of period end. (4) Net carrying value represents the difference between the market value of the TBA contract as of period end and the cost basis and is reported in Financial derivatives-assets at fair value and Financial derivatives-liabilities at fair value on the Consolidated Balance Sheet.
Derivative Activity, Volume [Table Text Block]	The table below details the average notional values of the Company's financial derivatives, using absolute value of month end notional values, for the nine-month period ended September 30, 2019 and the year ended December 31, 2018: Derivative Type Nine-Month Period Ended Year Ended (In thousands) Interest rate swaps $ 659,379 $ 606,315 TBAs 519,242 577,864 Futures 138,150 255,538 Options 1,940 5,385
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Table Text Block]	Gains and losses on the Company's financial derivatives for the three- and nine-month periods ended September 30, 2019 and 2018 are summarized in the tables below: Three-Month Period Ended September 30, 2019 Derivative Type Net Realized Gains (Losses) on Periodic Settlements of Interest Rate Swaps Net Realized Gains (Losses) on Financial Derivatives Other Than Periodic Settlements of Interest Rate Swaps Net Realized Gains (Losses) on Financial Derivatives Change in Net Unrealized Gains (Losses) on Accrued Periodic Settlements of Interest Rate Swaps Change in Net Unrealized Gains (Losses) on Financial Derivatives Other Than on Accrued Periodic Settlements of Interest Rate Swaps Change in Net Unrealized Gains (Losses) on Financial Derivatives (In thousands) Interest rate swaps $ 2,347 $ (2,930 ) $ (583 ) $ (1,815 ) $ (4,490 ) $ (6,305 ) TBAs (1,586 ) (1,586 ) 1,315 1,315 Futures 307 307 (361 ) (361 ) Total $ 2,347 $ (4,209 ) $ (1,862 ) $ (1,815 ) $ (3,536 ) $ (5,351 ) Three-Month Period Ended September 30, 2018 Derivative Type Net Realized Gains (Losses) on Periodic Settlements of Interest Rate Swaps Net Realized Gains (Losses) on Financial Derivatives Other Than Periodic Settlements of Interest Rate Swaps Net Realized Gains (Losses) on Financial Derivatives Change in Net Unrealized Gains (Losses) on Accrued Periodic Settlements of Interest Rate Swaps Change in Net Unrealized Gains (Losses) on Financial Derivatives Other Than on Accrued Periodic Settlements of Interest Rate Swaps Change in Net Unrealized Gains (Losses) on Financial Derivatives (In thousands) Interest rate swaps $ 1,281 $ 2,096 $ 3,377 $ (893 ) $ 2,383 $ 1,490 TBAs (692 ) (692 ) 2,100 2,100 Futures 1,622 1,622 1,237 1,237 Options (249 ) (249 ) (221 ) (221 ) Total $ 1,281 $ 2,777 $ 4,058 $ (893 ) $ 5,499 $ 4,606 Nine-Month Period Ended September 30, 2019 Derivative Type Net Realized Gains (Losses) on Periodic Settlements of Interest Rate Swaps Net Realized Gains (Losses) on Financial Derivatives Other Than Periodic Settlements of Interest Rate Swaps Net Realized Gains (Losses) on Financial Derivatives Change in Net Unrealized Gains (Losses) on Accrued Periodic Settlements of Interest Rate Swaps Change in Net Unrealized Gains (Losses) on Financial Derivatives Other Than on Accrued Periodic Settlements of Interest Rate Swaps Change in Net Unrealized Gains (Losses) on Financial Derivatives (In thousands) Interest rate swaps $ 2,978 $ (5,223 ) $ (2,245 ) $ (1,105 ) $ (23,184 ) $ (24,289 ) TBAs (6,578 ) (6,578 ) 1,819 1,819 Futures (13,800 ) (13,800 ) 7,709 7,709 Options (100 ) (100 ) — — Total $ 2,978 $ (25,701 ) $ (22,723 ) $ (1,105 ) $ (13,656 ) $ (14,761 ) Nine-Month Period Ended September 30, 2018 Derivative Type Net Realized Gains (Losses) on Periodic Settlements of Interest Rate Swaps Net Realized Gains (Losses) on Financial Derivatives Other Than Periodic Settlements of Interest Rate Swaps Net Realized Gains (Losses) on Financial Derivatives Change in Net Unrealized Gains (Losses) on Accrued Periodic Settlements of Interest Rate Swaps Change in Net Unrealized Gains (Losses) on Financial Derivatives Other Than on Accrued Periodic Settlements of Interest Rate Swaps Change in Net Unrealized Gains (Losses) on Financial Derivatives (In thousands) Interest rate swaps $ 1,072 $ 5,065 $ 6,137 $ (932 ) $ 12,167 $ 11,235 TBAs 10,151 10,151 1,460 1,460 Futures 272 272 3,242 3,242 Options (249 ) (249 ) 68 68 Total $ 1,072 $ 15,239 $ 16,311 $ (932 ) $ 16,937 $ 16,005

Borrowings under Repurchase A_2

Borrowings under Repurchase Agreements (Tables)	9 Months Ended
	Sep. 30, 2019
Disclosure of Repurchase Agreements [Abstract]
Schedule of Repurchase Agreements [Table Text Block]	The following table details the Company's outstanding borrowings under repurchase agreements as of September 30, 2019 and December 31, 2018: September 30, 2019 December 31, 2018 Weighted Average Weighted Average Remaining Days to Maturity Borrowings Outstanding Interest Rate Remaining Days to Maturity Borrowings Outstanding Interest Rate Remaining Days to Maturity (In thousands) 30 days or less $ 436,356 2.44 % 14 $ 512,505 2.45 % 16 31-60 days 589,760 2.27 46 594,199 2.56 46 61-90 days 273,218 2.21 74 359,861 2.71 75 91-120 days 20,881 2.39 94 — — — 121-150 days — — — — — — 151-180 days 17,769 2.15 169 14,996 2.72 177 Total $ 1,337,984 2.31 % 44 $ 1,481,561 2.56 % 44
Schedule of Repurchase Agreement Counterparties with Whom Repurchase Agreements Exceed 10 Percent of Stockholders' Equity [Table Text Block]	Amount at risk represents the excess, if any, for each counterparty of the fair value of collateral held by such counterparty over the amounts outstanding under repurchase agreements. The following table reflects counterparties for which the amounts at risk relating to our repurchase agreements were greater than 10% of shareholders' equity as of December, 31, 2018. There was no counterparty for which the amount at risk was greater than 10% of shareholders' equity as of September 30, 2019. December 31, 2018: Counterparty Amount at Risk (1) Weighted Average Remaining Days to Maturity Percentage of Shareholders' Equity (In thousands) Wells Fargo Bank, N.A. $ 20,214 41 13.1 % Royal Bank of Canada 16,563 43 10.8 % J.P. Morgan Securities LLC 16,057 39 10.4 % (1) Amounts at risk exclude, in aggregate, $(43) thousand of net accrued interest, defined as accrued interest on securities held as collateral less interest payable on cash borrowed.

Offsetting of Assets and Liab_2

Offsetting of Assets and Liabilities (Tables)	9 Months Ended
	Sep. 30, 2019
Offsetting of Assets and Liabilities [Abstract]
Offsetting of Assets and Liabilities [Table Text Block]	The following tables present information about certain assets and liabilities representing financial instruments as of September 30, 2019 and December 31, 2018. The Company has not previously entered into master netting agreements with any of its counterparties. Certain of the Company's repurchase and reverse repurchase agreements and financial derivative transactions are governed by underlying agreements that generally provide a right of offset in the event of default or in the event of a bankruptcy of either party to the transaction. September 30, 2019 : Description Amount of Assets (Liabilities) Presented in the Consolidated Balance Sheet (1) Financial Instruments Available for Offset Financial Instruments Transferred or Pledged as Collateral (2)(3) Cash Collateral (Received) Pledged (2)(3) Net Amount (In thousands) Assets: Financial derivatives–assets $ 475 $ (312 ) $ — $ — $ 163 Reverse repurchase agreements 43,008 (43,008 ) — — — Liabilities: Financial derivatives–liabilities (19,886 ) 312 — 19,341 (233 ) Repurchase agreements (1,337,984 ) 43,008 1,272,522 22,454 — (1) In the Company's Consolidated Balance Sheet, all balances associated with the repurchase agreements and financial derivatives are presented on a gross basis. (2) For the purpose of this presentation, for each row the total amount of financial instruments transferred or pledged and cash collateral (received) or pledged may not exceed the applicable gross amount of assets or (liabilities) as presented here. Therefore, the Company has reduced the amount of financial instruments transferred or pledged as collateral related to the Company's repurchase agreements and cash collateral pledged on the Company's financial derivative assets and liabilities. Total financial instruments transferred or pledged as collateral on the Company's repurchase agreements as of September 30, 2019 were $1.39 billion . As of September 30, 2019 total cash collateral (received) pledged on financial derivative assets and liabilities excludes $1.1 million and $13.6 million respectively of net excess cash collateral. (3) When collateral is pledged to or pledged by a counterparty, it is often pledged or posted with respect to all positions with such counterparty, and in such cases such collateral cannot be specifically identified as relating to a specific asset or liability. As a result, in preparing the above table, the Company has made assumptions in allocating pledged or posted collateral among the various rows. December 31, 2018: Description Amount of Assets (Liabilities) Presented in the Consolidated Balance Sheet (1) Financial Instruments Available for Offset Financial Instruments Transferred or Pledged as Collateral (2)(3) Cash Collateral (Received) Pledged (2)(3) Net Amount (In thousands) Assets: Financial derivatives–assets $ 11,839 $ (7,016 ) $ — $ (151 ) $ 4,672 Reverse repurchase agreements 379 (379 ) — — — Liabilities: Financial derivatives–liabilities (16,559 ) 7,016 — 9,321 (222 ) Repurchase agreements (1,481,561 ) 379 1,477,377 3,805 — (1) In the Company's Consolidated Balance Sheet, all balances associated with the repurchase agreements and financial derivatives are presented on a gross basis. (2) For the purpose of this presentation, for each row the total amount of financial instruments transferred or pledged and cash collateral (received) or pledged may not exceed the applicable gross amount of assets or (liabilities) as presented here. Therefore the Company has reduced the amount of financial instruments transferred or pledged as collateral related to the Company's repurchase agreements and cash collateral pledged on the Company's financial derivative assets and liabilities. Total financial instruments transferred or pledged as collateral on the Company's repurchase agreements as of December 31, 2018 were $1.57 billion . As of December 31, 2018 total cash collateral on financial derivative assets and liabilities excludes $5.1 million and $4.6 million , respectively of net excess cash collateral. (3) When collateral is pledged to or pledged by a counterparty, it is often pledged or posted with respect to all positions with such counterparty, and in such cases such collateral cannot be specifically identified as relating to a specific asset or liability. As a result, in preparing the above table, the Company has made assumptions in allocating pledged or posted collateral among the various rows.

Earnings per Share (Tables)

Earnings per Share (Tables)	9 Months Ended
	Sep. 30, 2019
Earnings Per Share [Abstract]
Schedule of Earnings Per Share Reconciliation	The following table presents a reconciliation of the earnings/(losses) and shares used in calculating basic EPS for the three- and nine-month periods ended September 30, 2019 and 2018: Three-Month Period Ended September 30, Nine-Month Period Ended September 30, (In thousands except for share amounts) 2019 2018 2019 2018 Numerator: Net income (loss) $ 3,729 $ 946 $ 12,550 $ (1,221 ) Denominator: Basic and diluted weighted average shares outstanding 12,459,478 12,693,989 12,464,800 12,875,884 Basic and diluted earnings per share $ 0.30 $ 0.07 $ 1.01 $ (0.09 )

Capital (Tables)

Capital (Tables)	9 Months Ended
	Sep. 30, 2019
Equity [Abstract]
Summary of Common Shares Outstanding [Table Text Block]	Detailed below is a roll forward of the Company's common shares outstanding for the three- and nine-month periods ended September 30, 2019 and 2018: Three-Month Period Ended September 30, Nine-Month Period Ended September 30, 2019 2018 2019 2018 Common Shares Outstanding (6/30/2019, 6/30/2018, 12/31/2018, and 12/31/2017, respectively) 12,467,103 12,712,050 12,507,213 13,340,217 Share Activity: Restricted shares issued 15,024 13,144 15,024 13,144 Shares repurchased (33,706 ) (21,720 ) (73,816 ) (649,887 ) Common Shares Outstanding (9/30/2019, 9/30/2018, 9/30/2019, and 9/30/2018, respectively) 12,448,421 12,703,474 12,448,421 12,703,474 Unvested restricted shares outstanding (9/30/2019, 9/30/2018, 9/30/2019, and 9/30/2018, respectively) 23,039 19,113 23,039 19,113
Vesting schedule for restricted shares [Table Text Block]	The below table provides details on the Company's restricted shares granted pursuant to share award agreements which are unvested at September 30, 2019 : Grant Recipient Number of Restricted Shares Granted Grant Date Vesting Date (1) Independent trustees: 15,024 September 11, 2019 September 10, 2020 Partially dedicated employees: 3,117 December 11, 2018 December 11, 2019 3,115 December 11, 2018 December 11, 2020 1,783 December 12, 2017 December 12, 2019 (1) Date at which such restricted shares will vest and become non-forfeitable.

Organization and Investment O_2

Organization and Investment Objective (Details)	9 Months Ended
	Sep. 30, 2019
Organization and Investment Objective [Line Items]
Required Distribution of Taxable Net Income, Percentage on Annual Basis	90.00%
Intended Distribution of Taxable Net Income, Percentage on Annual Basis	100.00%

Significant Accounting Polici_3

Significant Accounting Policies (Details)	9 Months Ended
	Sep. 30, 2019
Significant Accounting Policies [Line Items]
Required Distribution of Taxable Net Income, Percentage on Annual Basis	90.00%
Minimum [Member]
Significant Accounting Policies [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	1 year
Maximum [Member]
Significant Accounting Policies [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	2 years

Schedule of Mortgage-Backed Sec

Schedule of Mortgage-Backed Securities (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 1,394,568	$ 1,540,296
Residential Mortgage Backed Securities [Member]
Mortgage-Backed Securities [Line Items]
Current Principal	1,304,349	1,482,349
Unamortized Premium (Discount)	55,698	64,576
Amortized Cost	1,372,191	1,563,665
Gross Unrealized Gain on Securities	26,776	6,149
Gross Unrealized Losses on Securities	(4,399)	(29,518)
Mortgage-backed securities, at fair value	$ 1,394,568	$ 1,540,296
Weighted Average Coupon	4.03%	4.19%
Weighted Average Yield	3.21%	3.50%
Weighted Average Life (Years)	5 years 120 days	7 years 135 days
Non-Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Current Principal	$ 11,128	$ 13,755
Unamortized Premium (Discount)	(4,084)	(4,324)
Amortized Cost	7,044	9,431
Gross Unrealized Gain on Securities	2,132	1,806
Gross Unrealized Losses on Securities	0	(4)
Mortgage-backed securities, at fair value	$ 9,176	$ 11,233
Weighted Average Coupon	3.91%	4.38%
Weighted Average Yield	11.38%	12.59%
Weighted Average Life (Years)	5 years 321 days	5 years 252 days
15-year fixed rate mortgages [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Current Principal	$ 153,142	$ 135,537
Unamortized Premium (Discount)	2,771	3,307
Amortized Cost	155,913	138,844
Gross Unrealized Gain on Securities	4,193	655
Gross Unrealized Losses on Securities	(94)	(1,968)
Mortgage-backed securities, at fair value	$ 160,012	$ 137,531
Weighted Average Coupon	3.46%	3.56%
Weighted Average Yield	2.94%	2.88%
Weighted Average Life (Years)	4 years 40 days	4 years 330 days
20-year fixed rate mortgages [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Current Principal	$ 17,251	$ 7,267
Unamortized Premium (Discount)	742	575
Amortized Cost	17,993	7,842
Gross Unrealized Gain on Securities	355	0
Gross Unrealized Losses on Securities	0	(337)
Mortgage-backed securities, at fair value	$ 18,348	$ 7,505
Weighted Average Coupon	4.54%	4.00%
Weighted Average Yield	3.37%	2.53%
Weighted Average Life (Years)	4 years 15 days	5 years 321 days
30-year fixed rate mortgages [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Current Principal	$ 996,703	$ 1,237,047
Unamortized Premium (Discount)	47,996	57,470
Amortized Cost	1,044,699	1,294,517
Gross Unrealized Gain on Securities	17,757	2,731
Gross Unrealized Losses on Securities	(3,537)	(23,734)
Mortgage-backed securities, at fair value	$ 1,058,919	$ 1,273,514
Weighted Average Coupon	4.21%	4.22%
Weighted Average Yield	3.26%	3.48%
Weighted Average Life (Years)	5 years 325 days	8 years 37 days
Adjustable Rate Mortgages | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Current Principal	$ 36,681	$ 17,752
Unamortized Premium (Discount)	1,193	1,217
Amortized Cost	37,874	18,969
Gross Unrealized Gain on Securities	339	1
Gross Unrealized Losses on Securities	(101)	(727)
Mortgage-backed securities, at fair value	$ 38,112	$ 18,243
Weighted Average Coupon	3.85%	4.02%
Weighted Average Yield	2.27%	2.63%
Weighted Average Life (Years)	2 years 303 days	3 years 330 days
Reverse mortgages [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Current Principal	$ 89,444	$ 70,991
Unamortized Premium (Discount)	7,080	6,331
Amortized Cost	96,524	77,322
Gross Unrealized Gain on Securities	1,946	5
Gross Unrealized Losses on Securities	(34)	(1,423)
Mortgage-backed securities, at fair value	$ 98,436	$ 75,904
Weighted Average Coupon	4.60%	4.61%
Weighted Average Yield	2.85%	2.90%
Weighted Average Life (Years)	5 years 270 days	5 years 212 days
Interest-Only [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Amortized Cost	$ 12,144	$ 16,740
Gross Unrealized Gain on Securities	54	951
Gross Unrealized Losses on Securities	(633)	(1,325)
Mortgage-backed securities, at fair value	$ 11,565	$ 16,366
Weighted Average Coupon	3.03%	4.41%
Weighted Average Yield	2.99%	9.00%
Weighted Average Life (Years)	3 years 113 days	4 years 88 days
Agency Securities [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Current Principal	$ 1,293,221	$ 1,468,594
Unamortized Premium (Discount)	59,782	68,900
Amortized Cost	1,365,147	1,554,234
Gross Unrealized Gain on Securities	24,644	4,343
Gross Unrealized Losses on Securities	(4,399)	(29,514)
Mortgage-backed securities, at fair value	$ 1,385,392	$ 1,529,063
Weighted Average Coupon	4.03%	4.19%
Weighted Average Yield	3.17%	3.45%
Weighted Average Life (Years)	5 years 117 days	7 years 139 days

Schedule of Mortgage-Backed S_2

Schedule of Mortgage-Backed Securities by Weighted Average Life (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 1,394,568	$ 1,540,296
Non-Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	9,176	11,233
Amortized Cost	$ 7,044	$ 9,431
Weighted Average Coupon Rate, Percent	3.91%	4.38%
Less than three years [Member] | Non-Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 4,210	$ 4,635
Amortized Cost	$ 4,022	$ 3,975
Weighted Average Coupon Rate, Percent	5.47%	4.96%
Greater than three years and less than seven years [Member] | Non-Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 823	$ 2,500
Amortized Cost	$ 282	$ 2,366
Weighted Average Coupon Rate, Percent	4.05%	5.89%
Greater than seven years and less than eleven years [Member] | Non-Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 4,143	$ 4,098
Amortized Cost	$ 2,740	$ 3,090
Weighted Average Coupon Rate, Percent	2.52%	2.99%
Greater than eleven years [Member] | Non-Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 0	$ 0
Amortized Cost	$ 0	$ 0
Weighted Average Coupon Rate, Percent	0.00%	0.00%
Fixed Rate [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 1,373,827	$ 1,512,697
Amortized Cost	$ 1,353,003	$ 1,537,494
Weighted Average Coupon Rate, Percent	4.15%	4.17%
Fixed Rate [Member] | Less than three years [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 142,482	$ 12,667
Amortized Cost	$ 140,888	$ 12,796
Weighted Average Coupon Rate, Percent	4.78%	4.69%
Fixed Rate [Member] | Greater than three years and less than seven years [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 842,206	$ 394,733
Amortized Cost	$ 827,820	$ 399,895
Weighted Average Coupon Rate, Percent	4.17%	4.26%
Fixed Rate [Member] | Greater than seven years and less than eleven years [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 387,146	$ 1,086,032
Amortized Cost	$ 382,390	$ 1,105,538
Weighted Average Coupon Rate, Percent	3.87%	4.14%
Fixed Rate [Member] | Greater than eleven years [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 1,993	$ 19,265
Amortized Cost	$ 1,905	$ 19,265
Weighted Average Coupon Rate, Percent	3.50%	4.10%
Interest-Only [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 11,565	$ 16,366
Amortized Cost	$ 12,144	$ 16,740
Weighted Average Coupon Rate, Percent	3.03%	4.41%
Interest-Only [Member] | Less than three years [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 4,824	$ 1,129
Amortized Cost	$ 5,306	$ 1,671
Weighted Average Coupon Rate, Percent	4.32%	4.41%
Interest-Only [Member] | Greater than three years and less than seven years [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 6,741	$ 15,237
Amortized Cost	$ 6,838	$ 15,069
Weighted Average Coupon Rate, Percent	2.17%	4.41%
Interest-Only [Member] | Greater than seven years and less than eleven years [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 0	$ 0
Amortized Cost	$ 0	$ 0
Weighted Average Coupon Rate, Percent	0.00%	0.00%
Interest-Only [Member] | Greater than eleven years [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 0	$ 0
Amortized Cost	$ 0	$ 0
Weighted Average Coupon Rate, Percent	0.00%	0.00%

Mortgage-Backed Securities Inte

Mortgage-Backed Securities Interest Income Components (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Interest Income Components [Line Items]
Net Amortization			$ (10,065)	$ (8,165)
Interest income	$ 10,485	$ 13,171	35,237	40,677
Agency RMBS [Member]
Interest Income Components [Line Items]
Coupon Interest	14,941	16,744	46,893	50,341
Net Amortization	(5,097)	(4,029)	(13,452)	(11,485)
Interest income	9,844	12,715	33,441	38,856
Non-Agency RMBS [Member]
Interest Income Components [Line Items]
Coupon Interest	110	362	331	680
Net Amortization	81	44	344	282
Interest income	191	406	675	962
Residential Mortgage Backed Securities [Member]
Interest Income Components [Line Items]
Coupon Interest	15,051	17,106	47,224	51,021
Net Amortization	(5,016)	(3,985)	(13,108)	(11,203)
Interest income	$ 10,035	$ 13,121	$ 34,116	$ 39,818

Mortgage-Backed Securities Narr

Mortgage-Backed Securities Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Catch-up Premium Amortization Adjustment	$ (1.6)	$ (0.4)	$ (3.4)	$ (0.1)
Other-than-temporary Impairment Loss, Debt Securities, Portion Recognized in Earnings	$ 0.8		$ 4

Valuation Schedule of Fair Valu

Valuation Schedule of Fair Value Measurements (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives-assets, at fair value	$ 475	$ 11,839
Financial derivatives–liabilities, at fair value	(19,886)	(16,559)
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	1,394,568	1,540,296
Financial derivatives-assets, at fair value	475	11,839
Total mortgage-backed securities and financial derivatives–assets, at fair value	1,395,043	1,552,135
Financial derivatives–liabilities, at fair value	(19,886)	(16,559)
Total U.S. Treasury securities and financial derivatives-liabilities, at fair value	(57,721)	(16,933)
Fair Value, Measurements, Recurring [Member] | TBA securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives-assets, at fair value	384	794
Financial derivatives–liabilities, at fair value	(307)	(2,536)
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives-assets, at fair value	91	11,045
Financial derivatives–liabilities, at fair value	(19,458)	(6,193)
Fair Value, Measurements, Recurring [Member] | Futures [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value	(121)	(7,830)
Fair Value, Measurements, Recurring [Member] | Agency RMBS [Member] | 15-year fixed rate mortgages [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	160,012	137,531
Fair Value, Measurements, Recurring [Member] | Agency RMBS [Member] | 20-year fixed rate mortgages [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	18,348	7,505
Fair Value, Measurements, Recurring [Member] | Agency RMBS [Member] | 30-year fixed rate mortgages [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	1,058,919	1,273,514
Fair Value, Measurements, Recurring [Member] | Agency RMBS [Member] | Adjustable Rate Mortgages
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	38,112	18,243
Fair Value, Measurements, Recurring [Member] | Agency RMBS [Member] | Reverse mortgages [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	98,436	75,904
Fair Value, Measurements, Recurring [Member] | Agency RMBS [Member] | Interest-Only [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	11,565	16,366
Fair Value, Measurements, Recurring [Member] | Non-Agency RMBS [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	9,176	11,233
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
U.S. Treasury securities sold short, at fair value	(37,835)	(374)
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	0	0
Financial derivatives-assets, at fair value	0	0
Total mortgage-backed securities and financial derivatives–assets, at fair value	0	0
Financial derivatives–liabilities, at fair value	(121)	(7,830)
Total U.S. Treasury securities and financial derivatives-liabilities, at fair value	(121)	(7,830)
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | TBA securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives-assets, at fair value	0	0
Financial derivatives–liabilities, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives-assets, at fair value	0	0
Financial derivatives–liabilities, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Futures [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value	(121)	(7,830)
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Agency RMBS [Member] | 15-year fixed rate mortgages [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Agency RMBS [Member] | 20-year fixed rate mortgages [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Agency RMBS [Member] | 30-year fixed rate mortgages [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Agency RMBS [Member] | Adjustable Rate Mortgages
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Agency RMBS [Member] | Reverse mortgages [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Agency RMBS [Member] | Interest-Only [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Non-Agency RMBS [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
U.S. Treasury securities sold short, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	1,385,859	1,532,830
Financial derivatives-assets, at fair value	475	11,839
Total mortgage-backed securities and financial derivatives–assets, at fair value	1,386,334	1,544,669
Financial derivatives–liabilities, at fair value	(19,765)	(8,729)
Total U.S. Treasury securities and financial derivatives-liabilities, at fair value	(57,600)	(9,103)
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | TBA securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives-assets, at fair value	384	794
Financial derivatives–liabilities, at fair value	(307)	(2,536)
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives-assets, at fair value	91	11,045
Financial derivatives–liabilities, at fair value	(19,458)	(6,193)
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Futures [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Agency RMBS [Member] | 15-year fixed rate mortgages [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	160,012	137,531
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Agency RMBS [Member] | 20-year fixed rate mortgages [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	18,348	7,505
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Agency RMBS [Member] | 30-year fixed rate mortgages [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	1,058,919	1,273,514
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Agency RMBS [Member] | Adjustable Rate Mortgages
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	38,112	18,243
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Agency RMBS [Member] | Reverse mortgages [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	98,436	75,904
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Agency RMBS [Member] | Interest-Only [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	5,150	13,534
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Non-Agency RMBS [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	6,882	6,599
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
U.S. Treasury securities sold short, at fair value	(37,835)	(374)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	8,709	7,466
Financial derivatives-assets, at fair value	0	0
Total mortgage-backed securities and financial derivatives–assets, at fair value	8,709	7,466
Financial derivatives–liabilities, at fair value	0	0
Total U.S. Treasury securities and financial derivatives-liabilities, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | TBA securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives-assets, at fair value	0	0
Financial derivatives–liabilities, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives-assets, at fair value	0	0
Financial derivatives–liabilities, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Futures [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Agency RMBS [Member] | 15-year fixed rate mortgages [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Agency RMBS [Member] | 20-year fixed rate mortgages [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Agency RMBS [Member] | 30-year fixed rate mortgages [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Agency RMBS [Member] | Adjustable Rate Mortgages
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Agency RMBS [Member] | Reverse mortgages [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Agency RMBS [Member] | Interest-Only [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	6,415	2,832
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Non-Agency RMBS [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	2,294	4,634
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
U.S. Treasury securities sold short, at fair value	$ 0	$ 0

Valuation Unobservable Input Re

Valuation Unobservable Input Reconciliation (Details) - Level 3 [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Agency RMBS [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 4,950	$ 3,626	$ 2,832	$ 2,254
Purchases	1,771	0	1,771	160
Proceeds from sales	0	0	0	0
Principal repayments	0	0	0	0
(Amortization)/accretion, net	(496)	(251)	(769)	(884)
Net realized gains (losses)	(557)	(11)	(965)	(177)
Change in net unrealized gains (losses)	(120)	62	534	536
Transfers
Transfers into level 3	1,138	1,598	3,680	2,219
Transfers out of level 3	(271)	(916)	(668)	0
Ending balance	6,415	4,108	6,415	4,108
Change in net unrealized gains (losses) for level 3 assets still held	(200)	200	(300)	700
Non-Agency RMBS [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	2,360	6,993	4,634	8,832
Purchases	0	0	0	0
Proceeds from sales	0	0	(1,372)	(3,638)
Principal repayments	(101)	(369)	(704)	(593)
(Amortization)/accretion, net	85	62	257	197
Net realized gains (losses)	0	0	55	1,254
Change in net unrealized gains (losses)	(50)	289	160	(660)
Transfers
Transfers into level 3	0	658	0	2,241
Transfers out of level 3	0	0	(736)	0
Ending balance	2,294	7,633	2,294	7,633
Change in net unrealized gains (losses) for level 3 assets still held	(100)	300	200	300
Residential Mortgage Backed Securities [Member]
Transfers
Transfers into level 3	1,100	2,300	3,700	$ 4,500
Transfers out of level 3	$ (300)	$ (900)	$ (1,400)

Valuation Qualtitative Informat

Valuation Qualtitative Information (Details) - Level 3 [Member] - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Non-Agency RMBS [Member] | Market Quotes [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 2,294,000	$ 2,745,000
Non-Agency RMBS [Member] | Market Quotes [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-Binding Third-Party Valuation	62.56	83.59
Non-Agency RMBS [Member] | Market Quotes [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-Binding Third-Party Valuation	90.66	86.59
Non-Agency RMBS [Member] | Market Quotes [Member] | Weighted Average [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-Binding Third-Party Valuation	77.12	85.65
Non-Agency RMBS [Member] | Discounted Cash Flows [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value		$ 1,889,000
Non-Agency RMBS [Member] | Discounted Cash Flows [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield		3.40%
Projected Collateral Prepayments		50.20%
Projected Collateral Losses		2.30%
Projected Collateral Recoveries		7.50%
Projected Collateral Scheduled Amortization		17.80%
Non-Agency RMBS [Member] | Discounted Cash Flows [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield		5.40%
Projected Collateral Prepayments		66.40%
Projected Collateral Losses		8.60%
Projected Collateral Recoveries		12.30%
Projected Collateral Scheduled Amortization		39.90%
Non-Agency RMBS [Member] | Discounted Cash Flows [Member] | Weighted Average [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield		4.50%
Projected Collateral Prepayments		56.60%
Projected Collateral Losses		4.90%
Projected Collateral Recoveries		9.60%
Projected Collateral Scheduled Amortization		28.90%
Projected Total		100.00%
Interest-Only [Member] | Agency RMBS [Member] | Valuation, Income Approach [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 6,415,000	$ 2,832,000
Interest-Only [Member] | Agency RMBS [Member] | Valuation, Income Approach [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Projected Collateral Prepayments	46.90%	33.90%
Projected Collateral Scheduled Amortization	12.10%	20.50%
LIBOR OAS	0.77%	3.19%
Interest-Only [Member] | Agency RMBS [Member] | Valuation, Income Approach [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Projected Collateral Prepayments	87.90%	79.50%
Projected Collateral Scheduled Amortization	53.10%	66.10%
LIBOR OAS	12.41%	14.39%
Interest-Only [Member] | Agency RMBS [Member] | Valuation, Income Approach [Member] | Weighted Average [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Projected Collateral Prepayments	80.20%	59.40%
Projected Collateral Scheduled Amortization	19.80%	40.60%
Projected Total	100.00%	100.00%
LIBOR OAS	3.74%	7.34%

Valuation Fair Value, Other Fin

Valuation Fair Value, Other Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 50,188	$ 18,585	$ 41,016	$ 56,117
Due from brokers	56,734	24,051
Reverse repurchase agreements	43,008	379
Repurchase agreements	1,337,984	1,481,561
Due to brokers	294	1,325
Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	50,188	18,585
Due from brokers	56,734	24,051
Reverse repurchase agreements	43,008	379
Repurchase agreements	1,337,984	1,481,561
Due to brokers	294	1,325
Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	50,188	18,585
Due from brokers	56,734	24,051
Reverse repurchase agreements	43,008	379
Repurchase agreements	1,337,984	1,481,561
Due to brokers	$ 294	$ 1,325

Derivative Instruments Schedule

Derivative Instruments Schedule of Derivatves (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Financial derivatives–assets, at fair value	$ 475	$ 11,839
Financial derivatives–liabilities, at fair value	(19,886)	(16,559)
Derivative, Fair Value, Net	(19,411)	(4,720)
TBA securities- purchase contracts [Member]
Derivative [Line Items]
Derivative, Fair Value, Net	369	794
TBA securities- sale contracts [Member]
Derivative [Line Items]
Derivative, Fair Value, Net	(292)	(2,536)
Derivative Financial Instruments, Assets [Member] | TBA securities- purchase contracts [Member]
Derivative [Line Items]
Financial derivatives–assets, at fair value	369	794
Derivative Financial Instruments, Assets [Member] | TBA securities- sale contracts [Member]
Derivative [Line Items]
Financial derivatives–assets, at fair value	15	0
Derivative Financial Instruments, Liabilities [Member] | TBA securities- sale contracts [Member]
Derivative [Line Items]
Financial derivatives–liabilities, at fair value	(307)	(2,536)
Derivative Financial Instruments, Liabilities [Member] | Futures [Member]
Derivative [Line Items]
Financial derivatives–liabilities, at fair value	(121)	(7,830)
Short [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Fair Value, Net	(19,363)	4,011
Short [Member] | Derivative Financial Instruments, Assets [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Financial derivatives–assets, at fair value	86	10,201
Short [Member] | Derivative Financial Instruments, Liabilities [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Financial derivatives–liabilities, at fair value	(19,449)	(6,190)
Long [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Fair Value, Net	(4)	841
Long [Member] | Derivative Financial Instruments, Assets [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Financial derivatives–assets, at fair value	5	844
Long [Member] | Derivative Financial Instruments, Liabilities [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Financial derivatives–liabilities, at fair value	$ (9)	$ (3)

Derivative Instruments Schedu_2

Derivative Instruments Schedule of Interest Rate Swaps by Maturity (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Derivative, Fair Value, Net	$ (19,411)	$ (4,720)
Short [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount	647,257	639,630
Derivative, Fair Value, Net	$ (19,363)	$ 4,011
Weighted Average Pay Rate	2.04%	2.26%
Weighted Average Receive Rate	2.19%	2.58%
Derivative, Average Remaining Maturity	4 years 103 days	5 years 281 days
Short [Member] | Year 2020 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 86,000	$ 86,000
Derivative, Fair Value, Net	$ (31)	$ 1,390
Weighted Average Pay Rate	1.60%	1.60%
Weighted Average Receive Rate	2.26%	2.50%
Derivative, Average Remaining Maturity	209 days	1 year 118 days
Short [Member] | Year 2021 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 151,606	$ 165,600
Derivative, Fair Value, Net	$ (2,061)	$ 2,099
Weighted Average Pay Rate	2.11%	2.09%
Weighted Average Receive Rate	2.20%	2.63%
Derivative, Average Remaining Maturity	1 year 288 days	2 years 190 days
Short [Member] | Year 2022 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 60,100	$ 68,480
Derivative, Fair Value, Net	$ (857)	$ 1,289
Weighted Average Pay Rate	1.98%	2.00%
Weighted Average Receive Rate	2.19%	2.60%
Derivative, Average Remaining Maturity	2 years 231 days	3 years 157 days
Short [Member] | Year 2023 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 115,523	$ 23,600
Derivative, Fair Value, Net	$ (1,897)	$ 695
Weighted Average Pay Rate	1.96%	1.88%
Weighted Average Receive Rate	2.15%	2.51%
Derivative, Average Remaining Maturity	3 years 312 days	4 years 131 days
Short [Member] | Year 2024 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 26,591	$ 8,900
Derivative, Fair Value, Net	$ (306)	$ 269
Weighted Average Pay Rate	1.75%	1.99%
Weighted Average Receive Rate	2.22%	2.40%
Derivative, Average Remaining Maturity	4 years 308 days	5 years 95 days
Short [Member] | Year 2025 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 105,300	$ 47,722
Derivative, Fair Value, Net	$ (3,998)	$ (202)
Weighted Average Pay Rate	2.05%	2.57%
Weighted Average Receive Rate	2.10%	2.67%
Derivative, Average Remaining Maturity	6 years 94 days	6 years 62 days
Short [Member] | Year 2026 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 12,771	$ 40,885
Derivative, Fair Value, Net	$ (404)	$ 2,841
Weighted Average Pay Rate	1.93%	1.63%
Weighted Average Receive Rate	2.17%	2.63%
Derivative, Average Remaining Maturity	7 years 26 days	7 years 259 days
Short [Member] | Year 2027 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 30,000	$ 30,000
Derivative, Fair Value, Net	$ (1,831)	$ 845
Weighted Average Pay Rate	2.29%	2.29%
Weighted Average Receive Rate	2.29%	2.58%
Derivative, Average Remaining Maturity	7 years 217 days	8 years 124 days
Short [Member] | Year 2028 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 39,807	$ 150,563
Derivative, Fair Value, Net	$ (4,142)	$ (4,486)
Weighted Average Pay Rate	2.80%	2.97%
Weighted Average Receive Rate	2.22%	2.55%
Derivative, Average Remaining Maturity	8 years 278 days	9 years 223 days
Short [Member] | Year 2029 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 3,849
Derivative, Fair Value, Net	$ (77)
Weighted Average Pay Rate	1.80%
Weighted Average Receive Rate	2.27%
Derivative, Average Remaining Maturity	9 years 300 days
Short [Member] | Year 2036 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 2,700
Derivative, Fair Value, Net	$ (256)
Weighted Average Pay Rate	2.32%
Weighted Average Receive Rate	2.16%
Derivative, Average Remaining Maturity	16 years 142 days
Short [Member] | Year 2043 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 12,380	$ 12,380
Derivative, Fair Value, Net	$ (3,278)	$ (338)
Weighted Average Pay Rate	2.99%	2.99%
Weighted Average Receive Rate	2.18%	2.61%
Derivative, Average Remaining Maturity	23 years 231 days	24 years 139 days
Short [Member] | Year 2048 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 630	$ 5,500
Derivative, Fair Value, Net	$ (225)	$ (391)
Weighted Average Pay Rate	3.18%	3.18%
Weighted Average Receive Rate	2.13%	2.69%
Derivative, Average Remaining Maturity	29 years 66 days	29 years 339 days
Long [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 29,440	$ 93,182
Derivative, Fair Value, Net	$ (4)	$ 841
Weighted Average Pay Rate	2.09%	2.79%
Weighted Average Receive Rate	1.54%	2.77%
Derivative, Average Remaining Maturity	6 years 292 days	7 years 314 days
Long [Member] | Year 2023 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 9,940	$ 59,562
Derivative, Fair Value, Net	$ 1	$ 406
Weighted Average Pay Rate	2.09%	2.79%
Weighted Average Receive Rate	1.53%	2.72%
Derivative, Average Remaining Maturity	4 years 4 days	4 years 358 days
Long [Member] | Year 2024 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 7,000
Derivative, Fair Value, Net	$ 4
Weighted Average Pay Rate	2.10%
Weighted Average Receive Rate	1.52%
Derivative, Average Remaining Maturity	5 years 4 days
Long [Member] | Year 2028 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount		$ 18,870
Derivative, Fair Value, Net		$ 295
Weighted Average Pay Rate		2.79%
Weighted Average Receive Rate		2.89%
Derivative, Average Remaining Maturity		9 years 354 days
Long [Member] | Year 2029 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 12,500	$ 9,750
Derivative, Fair Value, Net	$ (9)	$ (3)
Weighted Average Pay Rate	2.09%	2.81%
Weighted Average Receive Rate	1.57%	2.71%
Derivative, Average Remaining Maturity	10 years 4 days	10 years 7 days
Long [Member] | Year 2048 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount		$ 5,000
Derivative, Fair Value, Net		$ 143
Weighted Average Pay Rate		2.78%
Weighted Average Receive Rate		2.98%
Derivative, Average Remaining Maturity		29 years 354 days

Derivative Instruments Schedu_3

Derivative Instruments Schedule of Futures (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Derivative, Fair Value, Net	$ (19,411)	$ (4,720)
US Treasury Note Futures [Member] | Futures [Member] | Short [Member]
Derivative [Line Items]
Derivative, Notional Amount		(301,300)
Derivative, Fair Value, Net		$ (7,830)
Derivative, Average Remaining Maturity		2 months 23 days
US Treasury Note Futures [Member] | Futures [Member] | Long [Member]
Derivative [Line Items]
Derivative, Notional Amount	(19,800)
Derivative, Fair Value, Net	$ (121)
Derivative, Average Remaining Maturity	3 months 1 day

Derivative Instruments Schedu_4

Derivative Instruments Schedule of TBA Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Financial derivatives–assets, at fair value	$ 475	$ 11,839
Financial derivatives–liabilities, at fair value	(19,886)	(16,559)
Derivative, Fair Value, Net	(19,411)	(4,720)
TBA securities- purchase contracts [Member]
Derivative [Line Items]
Derivative notional	106,465	95,054
Derivative cost basis	110,326	95,967
Market Value, Underyling	110,695	96,761
Derivative, Fair Value, Net	369	794
TBA securities- sale contracts [Member]
Derivative [Line Items]
Derivative notional	(301,223)	(289,012)
Derivative cost basis	(312,417)	(291,438)
Market Value, Underyling	(312,709)	(293,974)
Derivative, Fair Value, Net	(292)	(2,536)
TBA securities [Member]
Derivative [Line Items]
Derivative notional, net	(194,758)	(193,958)
Derivative cost basis	(202,091)	(195,471)
Market Value, Underyling	(202,014)	(197,213)
Derivative, Fair Value, Net	77	(1,742)
Derivative Financial Instruments, Assets [Member] | TBA securities- purchase contracts [Member]
Derivative [Line Items]
Derivative notional	106,465	95,054
Derivative cost basis	110,326	95,967
Market Value, Underyling	110,695	96,761
Financial derivatives–assets, at fair value	369	794
Derivative Financial Instruments, Assets [Member] | TBA securities- sale contracts [Member]
Derivative [Line Items]
Derivative notional	(63,370)	0
Derivative cost basis	(65,317)	0
Market Value, Underyling	(65,302)	0
Financial derivatives–assets, at fair value	15	0
Derivative Financial Instruments, Liabilities [Member] | TBA securities- sale contracts [Member]
Derivative [Line Items]
Derivative notional	(237,853)	(289,012)
Derivative cost basis	(247,100)	(291,438)
Market Value, Underyling	(247,407)	(293,974)
Financial derivatives–liabilities, at fair value	$ (307)	$ (2,536)

Schedule of Derivative Activity

Schedule of Derivative Activity (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Interest Rate Swap [Member]
Derivative [Line Items]
Financial derivative average monthly notional	$ 659,379	$ 606,315
TBA securities [Member]
Derivative [Line Items]
Financial derivative average monthly notional	519,242	577,864
Futures [Member]
Derivative [Line Items]
Financial derivative average monthly notional	138,150	255,538
Options Held [Member]
Derivative [Line Items]
Financial derivative average monthly notional	$ 1,940	$ 5,385

Derivative Instruments Schedu_5

Derivative Instruments Schedule of Gains and Losses on Derivative Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Derivative [Line Items]
Net realized gains (losses) on periodic settements of interest rate swaps	$ 2,347	$ 1,281	$ 2,978	$ 1,072
Net realized gains (losses) other than on periodic settements of interest rate swaps	(4,209)	2,777	(25,701)	15,239
Net realized gains (losses) on financial derivatives	(1,862)	4,058	(22,723)	16,311
Change in net unrealized gains (losses) on accrued periodic settlements on interest rate swaps	(1,815)	(893)	(1,105)	(932)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	(3,536)	5,499	(13,656)	16,937
Change in net unrealized gains (losses) on financial derivatives	(5,351)	4,606	(14,761)	16,005
Interest Rate Swap [Member]
Derivative [Line Items]
Net realized gains (losses) on periodic settements of interest rate swaps	2,347	1,281	2,978	1,072
Net realized gains (losses) other than on periodic settements of interest rate swaps	(2,930)	2,096	(5,223)	5,065
Net realized gains (losses) on financial derivatives	(583)	3,377	(2,245)	6,137
Change in net unrealized gains (losses) on accrued periodic settlements on interest rate swaps	(1,815)	(893)	(1,105)	(932)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	(4,490)	2,383	(23,184)	12,167
Change in net unrealized gains (losses) on financial derivatives	(6,305)	1,490	(24,289)	11,235
TBA securities [Member]
Derivative [Line Items]
Net realized gains (losses) other than on periodic settements of interest rate swaps	(1,586)	(692)	(6,578)	10,151
Net realized gains (losses) on financial derivatives	(1,586)	(692)	(6,578)	10,151
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	1,315	2,100	1,819	1,460
Change in net unrealized gains (losses) on financial derivatives	1,315	2,100	1,819	1,460
Futures [Member]
Derivative [Line Items]
Net realized gains (losses) other than on periodic settements of interest rate swaps	307	1,622	(13,800)	272
Net realized gains (losses) on financial derivatives	307	1,622	(13,800)	272
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	(361)	1,237	7,709	3,242
Change in net unrealized gains (losses) on financial derivatives	(361)	1,237	7,709	3,242
Options Held [Member]
Derivative [Line Items]
Net realized gains (losses) other than on periodic settements of interest rate swaps		(249)	(100)	(249)
Net realized gains (losses) on financial derivatives		(249)	(100)	(249)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps		(221)	0	68
Change in net unrealized gains (losses) on financial derivatives		$ (221)	0	$ 68
Short [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 647,257		$ 647,257		$ 639,630

Financial Derivatives Narrative

Financial Derivatives Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
U.S. Treasury securities sold short, at fair value	$ 37,835	$ 374
US Treasury Securities [Member]
Derivative [Line Items]
U.S. Treasury securities sold short, at fair value	37,834	400
Investment Sold, Not yet Purchased, Balance, Principal Amount	$ 37,400	$ 400

Borrowings under Repurchase A_3

Borrowings under Repurchase Agreements Schedule of Repurchase Agreements by Maturity (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Repurchase Agreements [Line Items]
Repurchase agreements	$ 1,337,984	$ 1,481,561
Debt, Weighted Average Interest Rate	2.31%	2.56%
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements	44 days	44 days
Maturity up to 30 days [Member]
Repurchase Agreements [Line Items]
Repurchase agreements	$ 436,356	$ 512,505
Debt, Weighted Average Interest Rate	2.44%	2.45%
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements	14 days	16 days
Maturity 31 to 60 days [Member]
Repurchase Agreements [Line Items]
Repurchase agreements	$ 589,760	$ 594,199
Debt, Weighted Average Interest Rate	2.27%	2.56%
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements	46 days	46 days
Maturity 61 to 90 days [Member]
Repurchase Agreements [Line Items]
Repurchase agreements	$ 273,218	$ 359,861
Debt, Weighted Average Interest Rate	2.21%	2.71%
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements	74 days	75 days
Maturity 91 to 120 days [Member]
Repurchase Agreements [Line Items]
Repurchase agreements	$ 20,881	$ 0
Debt, Weighted Average Interest Rate	2.39%	0.00%
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements	94 days	0 days
Maturity 121 to 150 days [Member] [Member]
Repurchase Agreements [Line Items]
Repurchase agreements	$ 0	$ 0
Debt, Weighted Average Interest Rate	0.00%	0.00%
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements	0 days	0 days
Maturity 151 to 180 days [Member] [Member]
Repurchase Agreements [Line Items]
Repurchase agreements	$ 17,769	$ 14,996
Debt, Weighted Average Interest Rate	2.15%	2.72%
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements	169 days	177 days

Borrowings under Repurchase A_4

Borrowings under Repurchase Agreements Borrowings under Repurchase Agreements Schedule of Repurchase Agreement by Counterparty (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Repurchase Agreement Counterparty [Line Items]
Repurchase Agreement Counterparty Concentration Risk Threshold	10.00%
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements	44 days	44 days
Net Accrued Interest		$ (43)
Wells Fargo Bank, N.A. [Member]
Repurchase Agreement Counterparty [Line Items]
Repurchase Agreement Counterparty, Amount at Risk		$ 20,214
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements		41 days
Repurchase Agreement Counterparty, Amount at Risk as a Percentage of Shareholders' Equity		13.10%
Royal Bank of Canada [Member]
Repurchase Agreement Counterparty [Line Items]
Repurchase Agreement Counterparty, Amount at Risk		$ 16,563
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements		43 days
Repurchase Agreement Counterparty, Amount at Risk as a Percentage of Shareholders' Equity		10.80%
J.P. Morgan Securities LLC [Member]
Repurchase Agreement Counterparty [Line Items]
Repurchase Agreement Counterparty, Amount at Risk		$ 16,057
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements		39 days
Repurchase Agreement Counterparty, Amount at Risk as a Percentage of Shareholders' Equity		10.40%

Borrowings under Repurchase A_5

Borrowings under Repurchase Agreements (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019USD ($)counterparties	Dec. 31, 2018USD ($)counterparties
Repurchase Agreements [Line Items]
Number of Counterparties with Outstanding Repurchase Agreements | counterparties	14	12
Repurchase Agreements, collateral amount	$ 1,400,000	$ 1,600,000
Minimum [Member]
Repurchase Agreements [Line Items]
Repurchase Agreements Maturity	30 days
Maximum [Member]
Repurchase Agreements [Line Items]
Repurchase Agreements Maturity	180 days
Repurchase Agreements [Member]
Repurchase Agreements [Line Items]
Pledged Assets, Unsettled	$ 91,500	74,400
Cash Collateral (Received) Pledged	$ 22,454	3,805
Security Owned and Pledged as Collateral, Fair Value		$ 1,100

Offsetting of Assets and Liab_3

Offsetting of Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Offsetting Assets and Liabilities [Line Items]
Financial derivatives–assets, at fair value	$ 475	$ 11,839
Reverse repurchase agreements	43,008	379
Financial derivatives–liabilities, at fair value	(19,886)	(16,559)
Repurchase agreements	(1,337,984)	(1,481,561)
Derivative Liability, Fair Value, Amount Offset Against Collateral	(312)	(7,016)
Securities sold under agreements to repurchase available for offset	(43,008)	(379)
Derivative Asset, Fair Value, Amount Offset Against Collateral	312	7,016
Securities purchased under agreements to resell available for offset	43,008	379
Derivative, Collateral, Obligation to Return Cash	0	(151)
Cash collateral received	0	0
Derivative, Collateral, Right to Reclaim Cash	19,341	9,321
Cash Collateral Pledged	22,454	3,805
Derivative Asset, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election	163	4,672
Reverse Repurchase Agreements and Related Collateral Net	0	0
Derivatives and related collateral, net	(233)	(222)
Repurchase agreements and related collateral, net	0	0
Securities Sold under Agreements to Repurchase, Fair Value of Collateral	1,390,000	1,570,000
Derivative Financial Instruments, Assets [Member]
Offsetting Assets and Liabilities [Line Items]
Excess cash collateral	1,100	5,100
Derivative Financial Instruments, Liabilities [Member]
Offsetting Assets and Liabilities [Line Items]
Excess cash collateral	13,600	4,600
Repurchase Agreements [Member]
Offsetting Assets and Liabilities [Line Items]
Financial Instruments Pledged as Collateral	1,272,522	1,477,377
Reverse Repurchase Agreements [Member]
Offsetting Assets and Liabilities [Line Items]
Financial Instruments Pledged as Collateral	0	0
Derivative Financial Instruments, Assets [Member]
Offsetting Assets and Liabilities [Line Items]
Financial Instruments Pledged as Collateral	0	0
Derivative Financial Instruments, Liabilities [Member]
Offsetting Assets and Liabilities [Line Items]
Financial Instruments Pledged as Collateral	$ 0	$ 0

Earnings per Share (Details)

Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Net income (loss)	$ 3,729	$ (107)	$ 8,928	$ 946	$ 1,786	$ (3,953)	$ 12,550	$ (1,221)
Basic and diluted weighted average shares outstanding	12,459,478			12,693,989			12,464,800	12,875,884
Basic and Diluted Earnings Per Share (in dollars per share)	$ 0.30			$ 0.07			$ 1.01	$ (0.09)

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Related Party Transaction [Line Items]
Accrued expenses	$ 681		$ 681		$ 838
Management Fee, Description			The Manager receives an annual management fee in an amount equal to 1.50% per annum of shareholders' equity (as defined in the Management Agreement) as of the end of each fiscal quarter (before deductions for any management fee with respect to such fiscal period). The management fee is payable quarterly in arrears.
Management agreement renewal period			1 year
Annual Base Management Fee, Percent	1.50%		1.50%
Management fees to affiliate	$ 582	$ 641	$ 1,759	$ 1,968
Expense reimbursement period			60 days
Expenses Reimbursed to Related Party			$ 1,700	$ 1,800
Termination fee percentage			5.00%
Termination Fee, Description			The Management Agreement requires the Company to pay a termination fee to the Manager in the event of (1) the Company's termination or non-renewal of the Management Agreement without cause or (2) the Manager's termination of the Management Agreement upon a default by the Company in the performance of any material term of the Management Agreement. Such termination fee will be equal to 5% of Shareholders' Equity, as defined in the Management Agreement as of the month-end preceding the date of the notice of termination or non-renewal of the Management Agreement.
Affiliated Entity [Member]
Related Party Transaction [Line Items]
Accrued expenses	$ 300		$ 300		$ 600

Capital Summary of Common Share

Capital Summary of Common Shares Outstanding (Details) - shares	3 Months Ended		9 Months Ended		16 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019
Equity [Abstract]
Common Shares Outstanding, beginning of period	12,467,103	12,712,050	12,507,213	13,340,217
Stock Issued During Period, Shares, Restricted Stock Award, Gross	15,024	13,144	15,024	13,144
Shares repurchased	(33,706)	(21,720)	(73,816)	(649,887)	(298,029)
Common Shares Outstanding, end of period	12,448,421	12,703,474	12,448,421	12,703,474	12,448,421
Unvested restricted shares outstanding	23,039	19,113	23,039	19,113	23,039

Capital Vesting Schedule for re

Capital Vesting Schedule for restricted shares (Details) - shares		Sep. 11, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares issued			15,024	13,144	15,024	13,144
Independent Trustees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares issued		15,024
Vest September 11, 2018 [Member] | Independent Trustees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares issued					15,024
Restricted share grant date					Sep. 11, 2019
Restricted share vesting date	[1]				Sep. 10, 2020
Vest December 11, 2019 [Member] | Partially dedicated employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares issued					3,117
Restricted share grant date					Dec. 11, 2018
Restricted share vesting date	[1]				Dec. 11, 2019
Vest December 11, 2020 [Member] | Partially dedicated employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares issued					3,115
Restricted share grant date					Dec. 11, 2018
Restricted share vesting date	[1]				Dec. 11, 2020
Vest December 12, 2019 [Member] | Partially dedicated employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares issued					1,783
Restricted share grant date					Dec. 12, 2017
Restricted share vesting date	[1]				Dec. 12, 2019
[1]	Date at which such restricted shares will vest and become non-forfeitable.

Capital (Details)

Capital (Details) - USD ($) $ / shares in Units, $ in Thousands	Sep. 11, 2019	Sep. 30, 2019		Jun. 30, 2019	[1]	Mar. 31, 2019	Sep. 30, 2018		Jun. 30, 2018		Mar. 31, 2018	Sep. 30, 2019		Sep. 30, 2018		Sep. 30, 2019	Dec. 31, 2018	Jun. 13, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock authorized		500,000,000										500,000,000				500,000,000	500,000,000
Common stock par value		$ 0.01										$ 0.01				$ 0.01	$ 0.01
Preferred stock authorized		100,000,000										100,000,000				100,000,000	100,000,000
Preferred stock par value		$ 0.01										$ 0.01				$ 0.01	$ 0.01
Common stock, shares issued		12,448,421										12,448,421				12,448,421	12,507,213
Preferred shares issued		0										0				0	0
Dividends declared (in dollars per share)		$ 0.28					$ 0.37					$ 0.90		$ 1.11
Dividends		$ (3,485)	[1]	$ (3,491)		$ (4,239)	$ (4,700)	[1]	$ (4,704)	[1]	$ (4,746)	$ (11,200)	[1]	$ (14,200)	[1]
Stock Issued During Period, Shares, Restricted Stock Award, Gross		15,024					13,144					15,024		13,144
Common Stock, Capital Shares Reserved for Future Issuance		306,061										306,061				306,061
Stock Repurchase Program, Authorized Amount																		1,200,000
Repurchase of common shares, shares		(33,706)					(21,720)					(73,816)		(649,887)		(298,029)
Repurchase of common shares, Value		$ (333)				$ (414)	$ (235)		$ (1,275)		$ (5,741)	$ (747)				$ (3,100)
Stock Repurchases Average Price Per Share		$ 9.87										$ 10.12				$ 10.46
Intended Distribution of Taxable Net Income, Percentage on Annual Basis												100.00%
Independent Trustees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Gross	15,024
[1]	For the three-month periods ended September 30, 2019 and 2018, dividends totaling $0.28 and $0.37, respectively, per common share outstanding, were declared. For the nine-month periods ended September 30, 2019 and 2018, dividends totaling $0.90 and $1.11, respectively, per common share outstanding, were declared.