THE FREMF TRUSTS - Condensed Consolidated Balance Sheets (Details) - USD ($)		Mar. 31, 2018	Dec. 31, 2017
Assets
Multi-family mortgage loans held in securitization trusts	[1]	$ 1,106,592,612	$ 1,130,874,274
Total assets	[1]	2,541,970,671	2,612,541,116
Liabilities and Equity
Multi-family securitized debt obligations	[1]	1,086,279,589	1,109,204,743
Total liabilities	[1]	2,391,609,548	2,466,749,839
Equity	[1]	150,361,123	145,791,277
Total liabilities and stockholders' equity	[1]	2,541,970,671	2,612,541,116
FREMF Trusts
Assets
Multi-family mortgage loans held in securitization trusts		1,106,592,612	1,130,874,274
Receivables		4,499,779	4,377,606
Total assets		1,111,092,391	1,135,251,880
Liabilities and Equity
Multi-family securitized debt obligations		1,086,279,589	1,109,204,743
Payables		4,473,478	4,352,039
Total liabilities		1,090,753,067	1,113,556,782
Equity		20,339,324	21,695,098
Total liabilities and stockholders' equity		$ 1,111,092,391	$ 1,135,251,880

[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 March 31, 2018 and December 31, 2017, assets of consolidated VIEs totaled $1,223,232,702 and $1,255,404,335 respectively, and the liabilities of consolidated VIEs totaled $1,197,735,060 and $1,228,295,517 respectively