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PLEDGED ASSETS - Assets Pledged to Counterparties (Details) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Pledged Assets [Line Items]    
Financial Instruments, Owned and Pledged as Collateral, at Fair Value $ 3,416,118,000 $ 3,584,354,000
Accrued interest receivable 10,378,000 12,404,000
OtherReceivablesFromBrokerDealersAndClearingOrganizations 0 0
Restricted cash 47,541,000 84,885,000
Total Assets Pledged To Counterparties 3,473,816,000 3,681,606,000
Repurchase Agreement [Member]    
Pledged Assets [Line Items]    
Restricted cash 24,767,000 65,851,000
Total Assets Pledged To Counterparties 3,451,042,000 3,662,572,000
Derivative [Member]    
Pledged Assets [Line Items]    
Restricted cash 22,774,000 19,034,000
Total Assets Pledged To Counterparties 22,774,000 19,034,000
Residential Mortgage Backed Securities [Member]    
Pledged Assets [Line Items]    
Financial Instruments, Owned and Pledged as Collateral, at Fair Value 3,416,118,000 3,584,354,000
Accrued interest receivable 10,157,000 12,367,000
Residential Mortgage Backed Securities [Member] | Pass Through Certificate [Member]    
Pledged Assets [Line Items]    
Financial Instruments, Owned and Pledged as Collateral, at Fair Value 3,387,253,000 3,500,394,000
Residential Mortgage Backed Securities [Member] | Structured Finance [Member]    
Pledged Assets [Line Items]    
Financial Instruments, Owned and Pledged as Collateral, at Fair Value 28,865,000 83,960,000
Residential Mortgage Backed Securities [Member] | Repurchase Agreement [Member]    
Pledged Assets [Line Items]    
Accrued interest receivable 10,157,000 12,367,000
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 3,387,253,000 3,500,394,000
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 28,865,000 83,960,000
Residential Mortgage Backed Securities [Member] | Derivative [Member]    
Pledged Assets [Line Items]    
Accrued interest receivable 0 0
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 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