RELATED PARTY TRANSACTIONS - Management Agreement (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Related Party Transaction [Line Items]
Due to affiliates	$ 554,000		$ 554,000		$ 654,000
Bimini Advisors, LLC [Member]
Related Party Transaction [Line Items]
Termination Date	2/20/2020
Automatic Renewal Period Of Management Agreement	1 year
Management Fees And Allocated Expenses	$ 1,654,000	$ 1,967,000	$ 3,261,000	$ 4,060,000
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%