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PLEDGED ASSETS - Assets Pledged to Counterparties (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Pledged Assets [Line Items]    
Financial Instruments, Owned and Pledged as Collateral, at Fair Value $ 3,584,354,000 $ 2,991,586,000
Accrued interest receivable 12,404,000 13,241,000
OtherReceivablesFromBrokerDealersAndClearingOrganizations 0 221,746,000
Restricted cash 84,885,000 17,981,000
Repurchase Agreement [Member]    
Pledged Assets [Line Items]    
Accrued interest receivable 12,367,000 12,905,000
OtherReceivablesFromBrokerDealersAndClearingOrganizations 0 220,654,000
Restricted cash 65,851,000 7,034,000
Total Assets Pledged To Counterparties 3,662,572,000 3,221,403,000
Derivative [Member]    
Pledged Assets [Line Items]    
Accrued interest receivable 0 35,000
OtherReceivablesFromBrokerDealersAndClearingOrganizations 0 0
Restricted cash 19,034,000 10,947,000
Total Assets Pledged To Counterparties 19,034,000 21,758,000
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 3,500,394,000 2,854,540,000
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 83,960,000 126,270,000
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 0 10,776,000
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