Consolidated K-Series - Condensed Balance Sheet of Consolidated K-Series (Details) - USD ($) $ in Thousands		Jun. 30, 2017	Dec. 31, 2016
Assets
Multi-family loans held in securitization trusts		$ 8,468,104	$ 6,939,844
Total Assets	[1]	10,406,574	8,951,631
Liabilities and Equity
Total Liabilities	[1]	9,563,131	8,100,469
Equity		838,381	848,075
Total Liabilities and Stockholders' Equity		10,406,574	8,951,631
Consolidated K-Series
Assets
Multi-family loans held in securitization trusts		8,468,104	6,939,844
Receivables		28,268	24,098
Total Assets		8,496,372	6,963,942
Liabilities and Equity
Multi-family CDOs		8,069,938	6,624,896
Accrued expenses		27,947	24,003
Total Liabilities		8,097,885	6,648,899
Equity		398,487	315,043
Total Liabilities and Stockholders' Equity		$ 8,496,372	$ 6,963,942

[1] Our condensed 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 June 30, 2017 and December 31, 2016, assets of consolidated VIEs totaled $8,880,785 and $7,330,872, respectively, and the liabilities of consolidated VIEs totaled $8,349,762 and $6,902,536, respectively. See Note 9 for further discussion.