THE FREMF TRUSTS - Condensed Consolidated Balance Sheets (Details) - USD ($)		Sep. 30, 2017	Dec. 31, 2016
Assets
Multi-family mortgage loans held in securitization trusts	[1]	$ 1,149,888,917	$ 1,222,905,433
Total assets	[1]	2,643,682,747	2,299,601,203
Liabilities and Equity
Multi-family securitized debt obligations	[1]	1,128,773,402	1,204,583,678
Total liabilities	[1]	2,493,144,083	2,157,134,338
Equity	[1]	150,538,664	142,466,865
Total liabilities and stockholders' equity	[1]	2,643,682,747	2,299,601,203
FREMF Trusts
Assets
Multi-family mortgage loans held in securitization trusts		1,149,888,917	1,222,905,433
Receivables		4,389,002	4,617,642
Total assets		1,154,277,919	1,227,523,075
Liabilities and Equity
Multi-family securitized debt obligations		1,128,773,402	1,204,583,678
Payables		4,365,218	4,597,357
Total liabilities		1,133,138,620	1,209,181,035
Equity		21,139,299	18,342,040
Total liabilities and stockholders' equity		$ 1,154,277,919	$ 1,227,523,075

[1] Our consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs") as the Company is the primary beneficiary of these VIEs. As of September 30, 2017 and December 31, 2016, assets of consolidated VIEs totaled $1,280,093,874 and $1,369,120,941 respectively, and the liabilities of consolidated VIEs totaled $1,253,353,428 and $1,344,404,080 respectively