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Investments in Equity Affiliates, Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017
Investment in Equity Affiliates
(Loss) income from equity affiliates	$ 995,312	$ 4,929,375	$ 1,755,145	$ 11,193,918
Multifamily
Investment in Equity Affiliates
Basis of equity participation interest before redemption	$ 1,500,000		1,500,000		$ 0
Percentage of equity participation redeemed	25.00%
Arbor Residential Investor LLC | Non-qualified Residential Mortgages
Investment in Equity Affiliates
Amount funded	$ 600,000		600,000
Cash distributions classified as return of capital			900,000
Arbor Residential Investor LLC | Non Qualified and Additional Residential Mortgages
Investment in Equity Affiliates
(Loss) income from equity affiliates		300,000		400,000
Arbor Residential Investor LLC | Non Qualified and Additional Residential Mortgages | Maximum
Investment in Equity Affiliates
(Loss) income from equity affiliates	100,000		100,000
Arbor Residential Investor LLC | Residential Mortgage Banking Company
Investment in Equity Affiliates
(Loss) income from equity affiliates	(1,300,000)	3,900,000	1,900,000	8,500,000
Lexford Portfolio
Investment in Equity Affiliates
(Loss) income from equity affiliates	$ 700,000	$ 700,000	$ 2,000,000	$ 2,100,000

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This element represents the aggregate cost of investments accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(12))
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Topic 230
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-Section 45
-Paragraph 28
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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Amount of distribution received from equity method investee for return of investment, classified as investing activities. Excludes distribution for return on investment, classified as operating activities.

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-Topic 230
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-URI http://asc.fasb.org/extlink&oid=98514028&loc=SL94080555-108585

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