| Summary of Significant Accounting Policies | Summary of Significant Accounting Policies — The accompanying unaudited condensed consolidated financial statements and related notes of KREF are prepared in accordance with accounting principles generally accepted in the United States of America (" GAAP ") for interim financial information and instructions to Form 10-Q. The condensed consolidated financial statements, including these notes, are unaudited and exclude some of the disclosures required in annual financial statements. Accordingly, certain information and footnote disclosures normally included in the consolidated financial statements have been condensed or omitted. The condensed consolidated financial statements include the accounts of KREF and its consolidated subsidiaries, and all intercompany transactions and balances have been eliminated. In the opinion of management, all adjustments considered necessary for a fair presentation of KREF ’s financial position, results of operations and cash flows have been included and are of a normal and recurring nature. The operating results presented for interim periods are not necessarily indicative of the results that may be expected for any other interim period or for the entire year. These condensed consolidated financial statements should be read in conjunction with KREF Consolidation — KREF consolidates those entities for which (i) it controls significant operating, financial and investing decisions of the entity or (ii) management determines that KREF is the primary beneficiary of entities deemed to be variable interest entities (" VIE s"). Variable Interest Entities — VIE s are defined as entities in which equity investors do not have an interest with the characteristics of a controlling financial interest or do not have sufficient equity at risk for the entity to finance its activities without additional subordinated financial support from other parties. A VIE is required to be consolidated only by its primary beneficiary, which is defined as the party that has the power to direct the activities of the VIE that most significantly impact its economic performance and that has the obligation to absorb losses of, or the right to receive benefits from, the VIE that could be potentially significant to the VIE (Note 8 ). To assess whether KREF has the power to direct the activities of a VIE that most significantly impact the VIE ’s economic performance, KREF considers all the facts and circumstances, including its role in establishing the VIE and its ongoing rights and responsibilities. This assessment includes, first, identifying the activities that most significantly impact the VIE ’s economic performance; and second, identifying which party, if any, has power to direct those activities. To assess whether KREF has the obligation to absorb losses of, or the right to receive benefits from, the VIE that could potentially be significant to the VIE , KREF considers all of its economic interests and applies judgment in determining whether these interests, in the aggregate, are considered potentially significant to the VIE . Collateralized Loan Obligation — KREF consolidates a collateralized loan obligation that closed in November 2018 (“ KREF 2018-FL1” or “CLO”) (Note 5 ). Management determined that the CLO Issuers, wholly-owned subsidiaries of KREF , were VIEs and that KREF was the primary beneficiary. KREF is the primary beneficiary of the VIEs since it has the ability to control the most significant activities of the CLO Issuers through ownership of non-investment grade rated subordinated controlling tranches, has the obligation to absorb losses, and the right to receive benefits, that could potentially be significant to these entities. As a result, KREF consolidates the CLO Issuers. The collateral assets of the CLO, comprised of a pool of loan participations (Note 5 ) are included in “Commercial mortgage loans, held-for-investment, net” on the accompanying Condensed Consolidated Balance Sheets. The liabilities of KREF 's consolidated CLO Issuers consist solely of obligations to the senior CLO noteholders, excluding subordinated CLO tranches held by KREF as such interests are eliminated in consolidation, are presented in “Collateralized loan obligations, net” in the accompanying Condensed Consolidated Balance Sheets. The collateral assets of the CLO can only be used to settle the obligations of the consolidated CLO. The interest income from the CLO collateral assets and the interest expense on the CLO liabilities are presented on a gross basis in “Interest income” and “Interest expense”, respectively, in KREF 's Condensed Consolidated Statements of Income. CMBS — KREF consolidates those trusts that issue beneficial ownership interests in mortgage loans secured by commercial real estate (commonly known as CMBS ) when KREF holds a variable interest in, and management considers KREF to be the primary beneficiary of, those trusts. Management believes the performance of the assets that underlie CMBS issuances most significantly impacts the economic performance of the trust, and the primary beneficiary is generally the entity that conducts activities that most significantly impact the performance of the underlying assets. In particular, the most subordinate tranches of CMBS expose the holder to the greater variability of economic performance when compared to more senior tranches since the subordinate tranches absorb a disproportionately higher amount of the credit risk related to the underlying assets. Generally, a trust designates the most junior subordinate tranche outstanding as the controlling class, which entitles the holder of the controlling class to unilaterally appoint and remove the special servicer for the trust. The special servicer is responsible for the servicing and administration of delinquent and nonperforming loans as well as real estate owned (" REO ") properties held as collateral delivered on foreclosed loans. While the special servicer cannot prevent losses, its services to the trust are designed to mitigate credit losses to holders of the CMBS . For the trust that KREF consolidates, KREF holds non-investment grade rated and unrated tranches that represent the most subordinated tranches of the CMBS issued by that trust, which include the controlling class. As the holder of the most subordinate tranche, KREF is in a first loss position and has the right to receive benefits. As the holder of the controlling class, KREF has the ability to unilaterally appoint and remove the special servicer for the trust. In these cases, management considers KREF to be the primary beneficiary and consolidates the CMBS trust. For VIE s in which management determines KREF is the primary beneficiary, all of the underlying assets, liabilities and equity of the trusts are recorded on KREF 's books, and the initial investment, along with any associated unrealized holding gains and losses, are eliminated in consolidation. Similarly, the interest income earned from these trusts is eliminated in consolidation. Management elected the fair value option for KREF 's initial and subsequent recognition of the assets and liabilities of KREF 's consolidated CMBS VIE s in order to provide users of the financial statements with better information regarding the effects of credit risk and other market factors on the CMBS beneficially held by KREF 's stockholders. Since the changes in fair value include the interest income and interest expense associated with these CMBS VIE s, management does not consider the separate presentation of the components of fair value changes to be relevant. Management has elected to present these items in aggregate as " Other Income — Change in net assets related to CMBS consolidated variable interest entities " in the accompanying Condensed Consolidated Statements of Income; the residual difference between the fair value of the trust's assets and liabilities represents KREF 's beneficial interest in the CMBS VIE s. Management separately presents the assets and liabilities of KREF 's consolidated VIE s as individual line items on KREF 's Condensed Consolidated Balance Sheets for entities in which the VIE s assets can only be used to settle the VIE ’s obligations. The liabilities of KREF 's consolidated VIE s consist solely of obligations to the CMBS holders of the consolidated trust, excluding CMBS held by KREF as such interests are eliminated in consolidation, and the interest accrued thereon, presented as "Liabilities — Variable interest entity liabilities, at fair value ." The assets of KREF 's consolidated VIEs consist principally of commercial mortgage loans and the interest accrued thereon, and are likewise presented as a single line item entitled " Assets — Commercial mortgage loans held in variable interest entities, at fair value ." Assets of a CMBS trust, as a whole, can only be used to settle the obligations of the consolidated CMBS VIE . The assets of KREF 's CMBS VIE s are not individually accessible by, and obligations of the CMBS VIE s are not recourse to, the bondholders. REO assets generally represent a small percentage of the overall asset pool of a CMBS trust. No REO existed in KREF 's consolidated VIE assets as of March 31, 2019 . KREF derives the fair value of its Level 3 CMBS VIE assets from its Level 3 CMBS VIE liabilities, which management considers to possess more observable market value data than the CMBS VIE assets. See "— Fair Value — Valuation of CMBS Consolidated VIEs " for additional discussion regarding management's valuation of consolidated CMBS VIE s. Noncontrolling Interests — Noncontrolling interests represent the ownership interests in certain consolidated subsidiaries held by entities or persons other than KREF . Those noncontrolling interests that allow the holder to redeem before liquidation or termination of the entity that issued those interests are considered redeemable noncontrolling interests. The redeemable noncontrolling interests issued by subsidiaries of KREF are subject to certain restrictions and require KREF to transfer assets or issue equity to satisfy the redemption. As KREF does not control the circumstances under which the noncontrolling interests may redeem their interests, management considers these redeemable noncontrolling interests as temporary equity, presented as " Temporary Equity — Redeemable noncontrolling interests in equity of consolidated joint venture " in the accompanying Condensed Consolidated Balance Sheets and their share of " Net Income (Loss) " as " Redeemable Noncontrolling Interests in Income (Loss) of Consolidated Joint Venture " in the Condensed Consolidated Statements of Income. KREF recorded the redeemable noncontrolling interests at fair value upon issuance by subsidiaries of KREF , and adjusts the carrying value of such interests to equal their respective redemption values at each subsequent reporting period date if KREF determines the noncontrolling interests are redeemable or probable to become redeemable. Temporary Equity — KREF determined that the Special Non-Voting Preferred Stock (“SNVPS”) became redeemable in the second quarter of 2018. As a result, starting with the second quarter of 2018, KREF adjusts the carrying value of the SNVPS to its redemption value quarterly. Accordingly, KREF adjusted the carrying value of the SNVPS to its redemption value of $2.2 million as of March 31, 2019 and recorded a ($0.6) million non-cash redemption value adjustment to the SNVPS (“SNVPS Redemption Value Adjustment”) during the three months ended March 31, 2019 . Such adjustment is treated similar to a dividend on preferred stock for GAAP purposes, accordingly, the SNVPS Redemption Value Adjustment is therefore deducted from (or added back to) “Net Income (loss) Attributable to KKR Real Estate Finance Trust Inc. and Subsidiaries” to arrive at “Net Income (Loss) Attributable to Common Stockholders” on KREF 's Condensed Consolidated Statements of Income. Equity method investments, at fair value — Investments are accounted for under the equity method when KREF has significant influence over the operations of an investee, but KREF does not consolidate that investment. Equity method investments, for which management has not elected a fair value option, are initially recorded at cost and subsequently adjusted for KREF 's share of net income or loss and cash contributions and distributions each period. Management determined that KREF 's investment in the Manager is an interest in a VIE as KREF did not have substantive participating or kick-out rights. KREF does not have the power to direct activities and the obligation to absorb losses of the Manager that could be significant to the Manager . KREF accounts for its investment in the Manager using the equity method since KREF is not the primary beneficiary of the Manager (Note 8 ). Management determined that its investment in an aggregator vehicle alongside KKR Real Estate Credit Opportunity Partners L.P. (" RECOP ") is an interest in a VIE , however KREF is not the primary beneficiary and does not have substantive participating or kick-out rights. Management elected the fair value option for KREF 's investment in RECOP . KREF records its share of net asset value in RECOP as “ Equity method investments, at fair value ” in its Condensed Consolidated Balance Sheets and its share of unrealized gains or losses in " Income from equity method investments " in its Condensed Consolidated Statements of Income. Use of Estimates — The preparation of condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. Management makes subjective estimates to project cash flows KREF expects to receive on its investments in loans and securities as well as the related market discount rates, which significantly impacts the interest income, impairments, allowance for loan loss and fair values recorded or disclosed. Actual results could differ from those estimates. Fair Value — GAAP requires the categorization of the fair value of financial instruments into three broad levels that form a hierarchy based on the transparency of inputs to the valuation. Level 1 - Inputs are unadjusted, quoted prices in active markets for identical assets or liabilities at the measurement date. Level 2 - Inputs are other than quoted prices that are observable for the asset or liability, either directly or indirectly. Level 2 inputs include quoted prices for similar instruments in active markets, and inputs other than quoted prices that are observable for the asset or liability. Level 3 - Inputs are unobservable for the asset or liability, and include situations where there is little, if any, market activity for the asset or liability. KREF follows this hierarchy for its financial instruments. The classifications are based on the lowest level of input that is significant to the fair value measurement. Estimates of fair value for cash and cash equivalents, restricted cash, and convertible notes are measured using observable, quoted market prices, or Level 1 inputs. Valuation Process — The Manager reviews the valuation of Level 3 financial instruments as part of KKR 's quarterly process. As of March 31, 2019 , KKR’s valuation process for Level 3 measurements, as described below, subjected valuations to the review and oversight of various committees. KKR has a global valuation committee assisted by the asset class-specific valuation committees, including a real estate valuation committee that reviews and approves all preliminary Level 3 valuations for real estate assets, including the financial instruments held by KREF . The global valuation committee is responsible for coordinating and implementing KKR ’s valuation process to ensure consistency in the application of valuation principles across portfolio investments and between periods. All Level 3 valuations are also subject to approval by the global valuation committee. Valuation of Commercial Mortgage Loans and Participation Sold — Management generally considers KREF 's commercial mortgage loans Level 3 assets in the fair value hierarchy as such assets are illiquid, structured investments that are specific to the property and its operating performance. These loans are valued using a discounted cash flow model using discount rates derived from observable market data applied to the capital structure of the respective sponsor and estimated property value. On a quarterly basis, management engages an independent valuation firm to express an opinion on the fair value of each loan categorized as a Level 3 asset in the form of a range. Management selects a value within the range provided by the independent valuation firm to assess the reasonableness of the fair value as determined by management. In the event that management's estimate of fair value differs from the opinion of fair value provided by the independent valuation firm, KREF ultimately relies solely upon the valuation prepared by the investment personnel of the Manager. Valuation of CLO Consolidated VIEs — Management estimates the fair value of the CLO liabilities using prices obtained from an independent valuation firm. If prices received from the independent valuation firm are inconsistent with values determined in connection with management’s independent review, management makes inquiries to the independent valuation firm about the prices received and related methods. In the event management determines the price obtained from an independent valuation firm to be unreliable or an inaccurate representation of the fair value of the CLO liabilities (based on considerations given to observable market data), management then compiles evidence independently and presents the independent valuation firm with such evidence supporting a different value. As a result, the independent valuation firm may revise their price accordingly. However, if management continues to disagree with the price from the independent valuation firm, in light of evidence presented that management compiled independently and believes to be compelling, management considers the independent valuation firm's quotation unreliable or inaccurate representation of the fair value of the CLO liabilities. In the event that the quotation from the independent valuation firm is not available or determined to be unreliable or an inadequate representation of the fair value of the CLO liabilities, valuations are prepared using inputs based on non-binding broker quotes obtained from independent, well-known, major financial brokers that are CLO market makers. In validating any non-binding broker quote used in this circumstance, management compares the non-binding quote to the observable market data points at such time and used to validate prices received from the independent valuation firm in addition to understanding the valuation methodologies used by the market makers. These market participants utilize a similar methodology as the independent valuation firm to value the CLO liabilities, with the key input of expected yield determined independently based on both observable and unobservable factors (as described above). To avoid reliance on any single broker-dealer, management receives a minimum of two non-binding quotes, of which the average is used. Valuation of CMBS Consolidated VIEs — Management categorizes the financial assets and liabilities of the CMBS trusts that KREF consolidates as Level 3 assets and liabilities in the fair value hierarchy and has elected the fair value option for financial assets and liabilities of each CMBS trust. Management has adopted the measurement alternative included in Accounting Standards Update (" ASU ") No. 2014-13, Measuring the Financial Assets and the Financial Liabilities of a Consolidated Collateralized Financing Entity (" ASU 2014-13"). Pursuant to ASU 2014-13, management measures both the financial assets and financial liabilities of the CMBS trusts consolidated by KREF using the fair value of the financial liabilities, which management considers more observable than the fair value of the financial assets. As a result, KREF presents the CMBS issued by the consolidated trust, but not beneficially owned by KREF 's stockholders, as financial liabilities in KREF 's condensed consolidated financial statements, measured at their estimated fair value; KREF measures the financial assets as the total estimated fair value of the CMBS issued by the consolidated trust, regardless of whether such CMBS represent interests beneficially owned by KREF 's stockholders. Under the measurement alternative prescribed by ASU 2014-13, KREF 's " Net Income (Loss) " reflects the economic interests in the consolidated CMBS beneficially owned by KREF 's stockholders, presented as " Change in net assets related to CMBS consolidated variable interest entities " in the Condensed Consolidated Statements of Income, which includes applicable (i) changes in the fair value of CMBS beneficially owned by KREF , (ii) interest and servicing fees earned from the CMBS trust and (iii) other residual returns or losses of the CMBS trust, if any (Note 8 ). Other Valuation Matters — For Level 3 financial assets originated, or otherwise acquired, and financial liabilities assumed during the calendar month immediately preceding a quarter end that were conducted in an orderly transaction with an unrelated party, management generally believes that the transaction price provides the most observable indication of fair value given the illiquid nature of these financial instruments, unless management is aware of any circumstances that may cause a material change in the fair value through the remainder of the reporting period. For instance, significant changes to the underlying property or its planned operations may cause material changes in the fair value of commercial mortgage loans acquired, or originated, by KREF . KREF ’s determination of fair value is based upon the best information available for a given circumstance and may incorporate assumptions that are management’s best estimates after consideration of a variety of internal and external factors. When an independent valuation firm expresses an opinion on the fair value of a financial instrument in the form of a range, management selects a value within the range provided by the independent valuation firm, generally the midpoint, to assess the reasonableness of management’s estimated fair value for that financial instrument. See Note 13 for additional information regarding the valuation of KREF 's financial assets and liabilities. Sales of Financial Assets and Financing Agreements — KREF will, from time to time, sell loans, securities and other assets as well as finance assets in the form of secured borrowings. In each case, management evaluates whether the transaction constitutes a sale through legal isolation of the transferred financial asset from KREF , the ability of the transferee to pledge or exchange the transferred asset without constraint and the transfer of control of the transferred asset. For transfers that constitute sales, KREF (i) recognizes the financial assets it retains and liabilities it has incurred, if any, (ii) derecognizes the financial assets it has sold, and derecognizes liabilities when extinguished and (iii) recognizes a realized gain, or loss, based upon the excess, or deficient, proceeds received over the carrying value of the transferred asset. KREF does not recognize a gain, or loss, on interests retained, if any, where management elected the fair value option prior to sale. Balance Sheet Measurement Cash and Cash Equivalents and Restricted Cash — KREF considers cash equivalents as highly liquid short-term investments with maturities of 90 days or less when purchased. Substantially all amounts on deposit with major financial institutions exceed insured limits. KREF must also maintain sufficient cash and cash equivalents to satisfy liquidity covenants related to its secured financing agreements. However, such amounts are not restricted from use in KREF 's current operations, and KREF does not present these cash and cash equivalents as restricted. As of March 31, 2019 and December 31, 2018 , KREF was required to maintain unrestricted cash and cash equivalents of at least $27.4 million and $15.2 million , respectively, to satisfy its liquidity covenants (Note 4 ). Commercial Mortgage Loans Held‑For‑Investment and Provision for Loan Losses — KREF recognizes its investments in commercial mortgage loans based on management's intent, and KREF 's ability, to hold those investments through their contractual maturity. Management classifies those loans that management does not intend to sell in the foreseeable future, and KREF is able to hold until maturity, as held-for-investment. Loans that are held‑for‑investment are carried at their aggregate outstanding face amount, net of applicable (i) unamortized origination or acquisition premiums and discounts, (ii) unamortized deferred nonrefundable fees and other direct loan origination costs, (iii) allowance for loan losses and (iv) charge-offs or write-downs of impaired loans. If a loan is determined to be impaired, management writes down the loan through a charge to the provision for loan losses. See "— Expense Recognition — Loan Impairment — Commercial Mortgage Loans, Held-For-Investment " for additional discussion regarding management’s determination for loan losses. KREF applies the interest method to amortize origination or acquisition premiums and discounts and deferred nonrefundable fees or other direct loan origination costs, or on a straight line basis when it approximates the interest method. Loans for which management elects the fair value option at the time of origination, or acquisition, are carried at fair value on a recurring basis (Note 3 ). Commercial Mortgage Loans Held‑For‑Sale — Loans that KREF originates, or acquires, which KREF is unable to hold, or management intends to sell or otherwise dispose of, in the foreseeable future are classified as held‑for‑sale and are carried at the lower of amortized cost or fair value. Secured Financing Agreements — KREF 's secured financing agreements, including Asset Specific Financings and Term Loan Financings, are treated as collateralized financing transactions and consist of floating rate, uncommitted repurchase facilities, Asset Specific Financing and Term Loan Financing arrangements carried at their contractual amounts, net of unamortized debt issuance costs (Note 4 ). Included within KREF 's secured financing agreements is the corporate revolving credit facility ("Revolver"). Convertible Notes, Net — KREF accounts for its convertible debt with a cash conversion feature in accordance with ASC 470-20 “Debt with Conversion and Other Options” which requires the liability and equity components of convertible debt instruments that may be settled in cash upon conversion, including partial cash settlement, to be separately accounted for in a manner that reflects the issuer’s nonconvertible debt borrowing rate. The initial proceeds from the sale of convertible notes are allocated between a liability component and an equity component in a manner that reflects interest expense at the rate of similar nonconvertible debt that could have been issued at such time. The equity component represents the excess initial proceeds received over the fair value of the liability component of the notes as of the date of issuance. KREF measured the estimated fair value of the debt component of the convertible notes due May 15, 2023 (“Convertible Notes”) as of the issuance date based on KREF ’s nonconvertible debt borrowing rate. The equity component of the Convertible Notes is reflected within additional paid-in capital on our Condensed Consolidated Balance Sheets, and the resulting debt discount is amortized over the period during which such Convertible Notes are expected to be outstanding (through the maturity date) as additional non-cash interest expense using the interest method, or on a straight line basis when it approximates the interest method. The additional non-cash interest expense attributable to such convertible notes will increase in subsequent periods through the maturity date as the notes accrete to their par value over the same period (Note 6 ). Loan Participations Sold, Net — In connection with its investments in senior loans, KREF finances certain investments through the syndication of non-recourse, or limited-recourse, loan participation to unaffiliated third parties. KREF ’s presentation of the senior loan and related financing involved in the syndication depends upon whether GAAP recognized the transaction as a sale, though such differences in presentation do not generally impact KREF ’s net stockholders’ equity or net income aside from timing differences in the recognition of certain transaction costs. To the extent that GAAP recognizes a sale resulting from the syndication, KREF derecognizes the participation in the senior loan that KREF sold and continues to carry the retained portion of the loan as an investment. While KREF does not generally expect to recognize a material gain or loss on these sales, KREF would realize a gain or loss in an amount equal to the difference between the net proceeds received from the third party purchaser and its carrying value of the loan participation that KREF sold at time of sale. Furthermore, KREF recognizes interest income only on the portion of the senior loan that it retains as a result of the sale. To the extent that GAAP does not recognize a sale resulting from the syndication, KREF does not derecognize the participation in the senior loan that it sold. Instead, KREF recognizes a loan participation sold liability in an amount equal to the principal of the loan participation syndicated less any unamortized discounts or financing costs resulting from the syndication. KREF continues to recognize interest income on the entire senior loan, including the interest attributable to the loan participation sold, as well as interest expense on the loan participation sold liability (Note 7 ). Other Assets and Accounts Payable, Accrued Expenses and Other Liabilities — As of March 31, 2019 , other assets primarily consisted of $1.7 million of deferred financing costs related to KREF 's corporate revolving credit facility (Note 4 ). As of December 31, 2018 , other assets included $1.4 million of deferred financing costs related to KREF 's revolving credit facility and $1.3 million of collateralized loan obligations interest receivable on collateral assets held by a third-party servicer as of December 31, 2018. As of March 31, 2019 , accounts payable, accrued expenses and other liabilities mainly consisted of $1.9 million of good faith deposits and $2.4 million of accrued expenses. As of December 31, 2018 , accounts payable, accrued expenses and other liabilities included $2.0 million of accrued share buybacks and $1.0 million of accrued deferred financing costs and offering costs. Special Non-Voting Preferred Stock (" SNVPS ") — Equity instruments that are redeemable for cash or other assets are classified as temporary equity if the instrument is redeemable, at the option of the holder, at a fixed or determinable price on a fixed or determinable date or upon the occurrence of an event that is not solely within the control of the issuer. Redeemable equity instruments are initially carried at the fair value of the equity instrument at the issuance date, which is subsequently adjusted at each balance sheet date if the instrument is currently redeemable or probable of becoming redeemable. KREF accounted for the SNVPS as redeemable preferred stock since a third party holds a redemption option, exercisable after May 5, 2018, and such redemption is not solely within KREF 's control. The SNVPS became redeemable in the second quarter of 2018. As a result, starting with the second quarter of 2018, KREF adjusts the carrying value of the SNVPS to its redemption value quarterly. Accordingly, KREF adjusted the carrying value of the SNVPS to its redemption value of $2.2 million as of March 31, 2019 and recorded a ($0.6) million non-cash redemption value adjustment to the SNVPS (“SNVPS Redemption Value Adjustment”) during the three months ended March 31, 2019 . Income Recognition Interest Income — Loans where management expects to collect all contractually required principal and interest payments are considered per |
