RELATED PARTY TRANSACTIONS - Management Agreement (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Related Party Transaction [Line Items]
Due to affiliates	$ 797,000	$ 566,000
Bimini Advisors, LLC [Member]
Related Party Transaction [Line Items]
Termination Date	2/20/2018
Automatic Renewal Period Of Management Agreement	1 year
Management Fees And Allocated Expenses	$ 7,431,000	$ 5,488,000	$ 5,042,000
Bimini Advisors, LLC [Member] | First $250 million of Equity [Member]
Related Party Transaction [Line Items]
Annual management fee as a percent of equity	1.50%
Bimini Advisors, LLC [Member] | Greater than $250 million but less than or equal to $500 million Equity [Member]
Related Party Transaction [Line Items]
Annual management fee as a percent of equity	1.25%
Bimini Advisors, LLC [Member] | Greater than $500 million of Equity [Member]
Related Party Transaction [Line Items]
Annual management fee as a percent of equity	1.00%