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PLEDGED ASSETS - Assets Pledged to Counterparties (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Pledged Assets [Line Items]    
Financial Instruments, Owned and Pledged as Collateral, at Fair Value $ 2,991,586,000 $ 3,712,561,000
Accrued interest receivable 13,241,000 14,444,000
OtherReceivablesFromBrokerDealersAndClearingOrganizations 221,746,000 0
Restricted cash 17,981,000 32,349,000
Repurchase Agreement [Member]    
Pledged Assets [Line Items]    
Accrued interest receivable 12,904,000 13,962,000
OtherReceivablesFromBrokerDealersAndClearingOrganizations 220,654,000 0
Restricted cash 7,034,000 25,296,000
Total Assets Pledged To Counterparties 3,221,402,000 3,751,819,000
Derivative [Member]    
Pledged Assets [Line Items]    
Accrued interest receivable 35,000 0
OtherReceivablesFromBrokerDealersAndClearingOrganizations 0 0
Restricted cash 10,947,000 7,053,000
Total Assets Pledged To Counterparties 21,758,000 7,053,000
Residential Mortgage Backed Securities [Member] | Repurchase Agreement [Member] | Pass Through Certificate [Member]    
Pledged Assets [Line Items]    
Financial Instruments, Owned and Pledged as Collateral, at Fair Value 2,854,540,000 3,612,244,000
Residential Mortgage Backed Securities [Member] | Repurchase Agreement [Member] | Structured Finance [Member]    
Pledged Assets [Line Items]    
Financial Instruments, Owned and Pledged as Collateral, at Fair Value 126,270,000 100,317,000
Residential Mortgage Backed Securities [Member] | Derivative [Member] | Pass Through Certificate [Member]    
Pledged Assets [Line Items]    
Financial Instruments, Owned and Pledged as Collateral, at Fair Value 10,776,000 0
Residential Mortgage Backed Securities [Member] | Derivative [Member] | Structured Finance [Member]    
Pledged Assets [Line Items]    
Financial Instruments, Owned and Pledged as Collateral, at Fair Value $ 0 $ 0