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REAL ESTATE SECURITIES - Additional Information (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]    
Unrealized gain (loss) on equity securities $ 86,900  
Other than temporary impairment losses included in consolidated statements of income $ 0 $ (1,000,000)