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DERIVATIVE FINANCIAL INTSTRUMENTS - Summary of Outstanding Swaptions (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Derivatives, Fair Value [Line Items]    
Assets, at Fair Value $ 13,199,000 $ 16,885,000
Payer Swaption [Member] | Less Than Or Equal To One Year [Member]    
Derivatives, Fair Value [Line Items]    
Swaption Cost 308,000 7,805,000
Assets, at Fair Value $ 53,000 $ 123,000
Derivative Instruments Average Months To Expiration 2 months 10 days 1 month 12 days
Notional Amount $ 100,000,000 $ 700,000,000
Derivative Average Fixed Interest Rate 2.71% 3.20%
Term (Years) 7 years 9 years