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Investments in Equity Affiliates (Details 2) - USD ($)	1 Months Ended		3 Months Ended			6 Months Ended
	Jul. 31, 2014	May. 31, 2014	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Investment in Equity Affiliates
Income from equity affiliates			$ 1,534,025		$ 40,493	$ 4,629,938	$ 80,541
Investments in equity affiliates			24,368,379			24,368,379		$ 4,869,066
Mortgage Loans on Real Estate, Carrying Amount of Mortgages			1,595,706,784			1,595,706,784		1,587,429,498
Bridge Loans
Investment in Equity Affiliates
Mortgage Loans on Real Estate, Carrying Amount of Mortgages			1,346,226,583			1,346,226,583		1,273,439,238
Mezzanine Loans
Investment in Equity Affiliates
Mortgage Loans on Real Estate, Carrying Amount of Mortgages			61,952,792			$ 61,952,792		$ 76,392,650
Arbor Residential Investor LLC
Investment in Equity Affiliates
Equity investment				$ 100,000
Indirect ownership percentage				22.50%		20.00%
Income from equity affiliates			1,500,000			$ 4,600,000
Investments in equity affiliates			19,457,171			19,457,171
Arbor Residential Investor LLC | ACM
Investment in Equity Affiliates
Percentage of ownership interest of related party in the entity				50.00%
Promote (as a percent)				25.00%
Return on investment (as a percent)				10.00%
Arbor Residential Investor LLC | Non-qualified Residential Mortgages
Investment in Equity Affiliates
Equity investment				$ 1,700,000
Ownership percentage				50.00%
Arbor Residential Investor LLC | Non-qualified Residential Mortgages | ACM
Investment in Equity Affiliates
Percentage of ownership interest of related party in the entity				100.00%
Arbor Residential Investor LLC | Additional mortgage purchases
Investment in Equity Affiliates
Equity investment			1,700,000	$ 1,900,000		1,700,000
Arbor Residential Investor LLC | Non Qualified and Additional Residential Mortgages
Investment in Equity Affiliates
Equity investment			5,300,000			5,300,000
Income from equity affiliates			$ 100,000			$ 100,000
930 Flushing & 80 Evergreen
Investment in Equity Affiliates
Proceeds from sale of properties		$ 7,900,000
Debt repaid	$ 22,900,000
Investments in equity affiliates		$ 100,000

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

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The carrying amount of the outstanding balance due under the mortgage loan.

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The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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