Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Legal Proceedings. From time to time, we may be involved in various claims and legal actions arising in the ordinary course of business. On June 28, 2018, AmBase Corporation, 111 West 57th Street Manager Funding LLC and 111 West 57th Investment LLC commenced an action captioned AmBase Corporation et al v. ACREFI Mortgage Lending, LLC et al (No 653251/2018) in New York Supreme Court (the "Apollo Action"). The complaint names as defendants (i) a wholly owned subsidiary of the Company ("Subsidiary"), (ii) the Company, and (iii) certain funds managed by Apollo, who are co-lenders on a mezzanine loan against the development of a residential condominium building in Manhattan, New York. The plaintiffs alleged that the defendants tortiously interfered with the contractual equity put right in the plaintiffs’ joint venture agreement with the developers of the project, and that the defendants aided and abetted breaches of fiduciary duty by the developers of the project. The plaintiffs alleged the loss of a $70.0 million investment as part of total damages of $700.0 million, which included punitive damages. The defendants' motion to dismiss was granted on October 23, 2019 and the Court entered judgment dismissing the complaint in its entirety on November 8, 2019. Plaintiffs filed a timely notice of appeal on December 6, 2019 and the parties fully briefed the appeal. In April 2021, Plaintiffs filed a motion for leave to amend the complaint in a separate action, 111 West 57th Investment LLC v. 111W57 Mezz Investor LLC (No. 655031/2017) in New York Supreme Court (the "April 2021 Action"). The April 2021 Action concerns the same condominium development project as the Apollo Action, and Plaintiffs now seek to name Apollo Global Management, Inc., the Company, and certain funds managed by Apollo as defendants. Plaintiffs then requested to withdraw the pending appeal in the Apollo Action and Apollo has consented, although the Court has not yet marked the appeal off the calendar. We believe the claims in this action are without merit. Because this action is in the early stages, no reasonable estimate of possible loss, if any, can be made at this time. Loan Commitments. As described in "Note 4 - Commercial Mortgage, Subordinate Loans and Other Lending Assets, Net" at March 31, 2021, we had $1.4 billion of unfunded commitments related to our commercial mortgage and subordinate loans. The timings and amounts of fundings are uncertain as these commitments relate to loans for construction costs, capital expenditures, leasing costs, interest and carry costs, among others. As such, the timings and amounts of future fundings depend on the progress and performance of the underlying assets of our loans. Certain of our lenders are contractually obligated to fund their ratable portion of these loan commitments over time, while other lenders have some degree of discretion over future loan funding obligations. The total unfunded commitment is expected to be funded over the remaining 4.0 years weighted average tenor of these loans. COVID-19. The COVID-19 global pandemic has brought forth uncertainty and disruption to the global economy. The magnitude and duration of the COVID-19 pandemic and its impact on our borrowers and their tenants, cash flows and future results of operations could be significant and will largely depend on future developments, which are highly uncertain and cannot be predicted, including new information which may emerge concerning the severity of the COVID-19 pandemic, the success of actions taken to contain or treat the pandemic, and reactions by consumers, companies, governmental entities and capital markets. The prolonged duration and impact of the COVID-19 pandemic could materially disrupt our business operations and impact our financial performance. As of March 31, 2021, we have not recorded any contingencies on our condensed consolidated balance sheet related to COVID-19. To the extent COVID-19 continues to cause dislocations in the global economy, our financial condition, results of operations, and cash flows may continue to be adversely impacted. Refer to “Note 2 - Summary of Significant Accounting Policies” for further discussion regarding COVID-19.