Commitments and Contingencies	9 Months Ended
Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Legal Proceedings. From time to time, the Company may be involved in various claims and legal actions arising in the ordinary course of business. After the announcement of the execution of the AMTG Merger Agreement, two putative class action lawsuits challenging the proposed First Merger (as defined in the AMTG Merger Agreement), captioned Aivasian v. Apollo Residential Mortgage, Inc., et al., No. 24-C-16-001532 and Wiener v. Apollo Residential Mortgage, Inc., et al., No. 24-C-16-001837, were filed in the Circuit Court for Baltimore City, (the “Court”). A putative class and derivative lawsuit was later filed in the Court captioned Crago v. Apollo Residential Mortgage, Inc., No. 24-C-16-002610. Following a hearing on May 6, 2016, the Court entered orders among other things, consolidating the three actions under the caption In Re Apollo Residential Mortgage, Inc. Shareholder Litigation, Case No.: 24-C-16-002610. The plaintiffs have designated the Crago complaint as the operative complaint. The operative complaint includes both direct and derivative claims, names as defendants AMTG, the board of directors of AMTG (the “AMTG Board”), ARI, Arrow Merger Sub Inc., Apollo and Athene Holding Ltd. and alleges, among other things, that the members of the AMTG Board breached their fiduciary duties to the AMTG stockholders and that the other corporate defendants aided and abetted such fiduciary breaches. The operative complaint further alleges, among other things, that the proposed First Merger involves inadequate consideration, was the result of an inadequate and conflicted sales process, and includes unreasonable deal protection devices that purportedly preclude competing offers. It also alleges that the transactions with Athene Holding Ltd. are unfair and that the registration statement on Form S-4 filed with the SEC on April 6, 2016 contains materially misleading disclosures and omits certain material information. The operative complaint seeks, among other things, certification of the proposed class, declaratory relief, preliminary and permanent injunctive relief, including enjoining or rescinding the First Merger, unspecified damages, and an award of other unspecified attorneys’ and other fees and costs. On May 6, 2016, counsel for the plaintiffs filed with the Court a stipulation seeking the appointment of interim co-lead counsel, which stipulation was approved by the Court on June 9, 2016. Defendants’ motions to dismiss have been fully briefed, and oral argument was held on December 8, 2016. On August 14, 2017, the Court issued an opinion dismissing the operative complaint in its entirety with prejudice. The time to appeal the order dismissing the lawsuit has expired, and no appeals have been filed. On January 4, 2017, the United States Department of Justice served a Request for Information and Documents (the “Request”) on the Company, in connection with a preliminary investigation into certain aspects of the Company's former residential real estate portfolio, which the Company acquired in connection with the AMTG Merger and subsequently sold in 2016. The Request seeks a range of information in connection with the residential real estate portfolio, including, among other things, information concerning policies, procedures, and practices related to advertising, marketing, identifying, or acquiring residential properties for sale or rent, and various data for all rental and sales contracts executed since January 1, 2012. The Company is cooperating with the Department of Justice and fully complying with the Request. Loan Commitments. As described in "Note 5 - Loans, Held for Investment", at September 30, 2017, the Company had $80,164 of unfunded commitments related to its commercial mortgage loan portfolio and subordinate loan portfolio.

Commitments and Contingencies

Legal Proceedings. From time to time, the Company may be involved in various claims and legal actions arising in the ordinary course of business.

After the announcement of the execution of the AMTG Merger Agreement, two putative class action lawsuits challenging the proposed First Merger (as defined in the AMTG Merger Agreement), captioned Aivasian v. Apollo Residential Mortgage, Inc., et al., No. 24-C-16-001532 and Wiener v. Apollo Residential Mortgage, Inc., et al., No. 24-C-16-001837, were filed in the Circuit Court for Baltimore City, (the “Court”). A putative class and derivative lawsuit was later filed in the Court captioned Crago v. Apollo Residential Mortgage, Inc., No. 24-C-16-002610. Following a hearing on May 6, 2016, the Court entered orders among other things, consolidating the three actions under the caption In Re Apollo Residential Mortgage, Inc. Shareholder Litigation, Case No.: 24-C-16-002610. The plaintiffs have designated the Crago complaint as the operative complaint. The operative complaint includes both direct and derivative claims, names as defendants AMTG, the board of directors of AMTG (the “AMTG Board”), ARI, Arrow Merger Sub Inc., Apollo and Athene Holding Ltd. and alleges, among other things, that the members of the AMTG Board breached their fiduciary duties to the AMTG stockholders and that the other corporate defendants aided and abetted such fiduciary breaches. The operative complaint further alleges, among other things, that the proposed First Merger involves inadequate consideration, was the result of an inadequate and conflicted sales process, and includes unreasonable deal protection devices that purportedly preclude competing offers. It also alleges that the transactions with Athene Holding Ltd. are unfair and that the registration statement on Form S-4 filed with the SEC on April 6, 2016 contains materially misleading disclosures and omits certain material information. The operative complaint seeks, among other things, certification of the proposed class, declaratory relief, preliminary and permanent injunctive relief, including enjoining or rescinding the First Merger, unspecified damages, and an award of other unspecified attorneys’ and other fees and costs. On May 6, 2016, counsel for the plaintiffs filed with the Court a stipulation seeking the appointment of interim co-lead counsel, which stipulation was approved by the Court on June 9, 2016. Defendants’ motions to dismiss have been fully briefed, and oral argument was held on December 8, 2016. On August 14, 2017, the Court issued an opinion dismissing the operative complaint in its entirety with prejudice. The time to appeal the order dismissing the lawsuit has expired, and no appeals have been filed.

On January 4, 2017, the United States Department of Justice served a Request for Information and Documents (the “Request”) on the Company, in connection with a preliminary investigation into certain aspects of the Company's former residential real estate portfolio, which the Company acquired in connection with the AMTG Merger and subsequently sold in 2016. The Request seeks a range of information in connection with the residential real estate portfolio, including, among other things, information concerning policies, procedures, and practices related to advertising, marketing, identifying, or acquiring residential properties for sale or rent, and various data for all rental and sales contracts executed since January 1, 2012. The Company is cooperating with the Department of Justice and fully complying with the Request.

Loan Commitments. As described in "Note 5 - Loans, Held for Investment", at September 30, 2017, the Company had $80,164 of unfunded commitments related to its commercial mortgage loan portfolio and subordinate loan portfolio.