THE FREMF TRUSTS - Condensed Consolidated Balance Sheets (Details) - USD ($)		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015	Dec. 31, 2014
Assets
Multi-family mortgage loans held in securitization trusts	[1]	$ 1,130,874,274		$ 1,222,905,433
Total assets	[1]	2,612,541,116		2,299,601,203
Liabilities and Equity
Multi-family securitized debt obligations	[1]	1,109,204,743		1,204,583,678
Total liabilities	[1]	2,466,749,839		2,157,134,338
Equity		145,791,277	[1]	142,466,865	[1]	$ 177,494,528	$ 212,798,130
Total liabilities and equity	[1]	2,612,541,116		2,299,601,203
FREMF Trusts
Assets
Multi-family mortgage loans held in securitization trusts		1,130,874,274		1,222,905,433
Receivables		4,377,606		4,617,642
Total assets		1,135,251,880		1,227,523,075
Liabilities and Equity
Multi-family securitized debt obligations		1,109,204,743		1,204,583,678
Payables		4,352,039		4,597,357
Total liabilities		1,113,556,782		1,209,181,035
Equity		21,695,098		18,342,040
Total liabilities and equity		$ 1,135,251,880		$ 1,227,523,075

[1] Our consolidated balance sheets include assets and liabilities of consolidated variable interest entities (“VIE's) as the Company is the primary beneficiary of these VIEs. As of December 31, 2017 and December 31, 2016, assets of consolidated VIEs totaled $1,255,404,335 and $1,369,120,941, respectively, and the liabilities of consolidated VIEs totaled $1,228,295,517 and $1,344,404,080, respectively