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PLEDGED ASSETS - Assets Pledged to Counterparties (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Pledged Assets [Line Items]    
Financial Instruments, Owned and Pledged as Collateral, at Fair Value $ 4,120,500,000 $ 3,719,906,000
Accrued interest receivable 10,852,000 9,721,000
OtherReceivablesFromBrokerDealersAndClearingOrganizations 154,977,000 414,000
Restricted cash 117,155,000 79,363,000
Total Assets Pledged To Counterparties 4,403,204,000 3,808,905,000
Repurchase Agreement [Member]    
Pledged Assets [Line Items]    
Accrued interest receivable 10,572,000 9,636,000
OtherReceivablesFromBrokerDealersAndClearingOrganizations 154,977,000 0
Restricted cash 102,575,000 58,829,000
Total Assets Pledged To Counterparties 4,388,624,000 3,788,371,000
Derivative [Member]    
Pledged Assets [Line Items]    
Accrued interest receivable 0 0
OtherReceivablesFromBrokerDealersAndClearingOrganizations 0 0
Restricted cash 14,580,000 20,534,000
Total Assets Pledged To Counterparties 14,580,000 20,534,000
Total Pledged [Member]    
Pledged Assets [Line Items]    
Accrued interest receivable 10,572,000 9,636,000
OtherReceivablesFromBrokerDealersAndClearingOrganizations 154,977,000 0
Restricted cash 117,155,000 79,363,000
Total Assets Pledged To Counterparties 4,403,204,000 3,808,905,000
Residential Mortgage Backed Securities [Member]    
Pledged Assets [Line Items]    
Financial Instruments, Owned and Pledged as Collateral, at Fair Value 4,120,500,000 3,719,906,000
Residential Mortgage Backed Securities [Member] | Pass Through Certificate [Member]    
Pledged Assets [Line Items]    
Financial Instruments, Owned and Pledged as Collateral, at Fair Value 4,081,596,000 3,692,811,000
Residential Mortgage Backed Securities [Member] | Structured Finance [Member]    
Pledged Assets [Line Items]    
Financial Instruments, Owned and Pledged as Collateral, at Fair Value 38,904,000 27,095,000
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 4,081,596,000 3,692,811,000
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 38,904,000 27,095,000
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 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
Residential Mortgage Backed Securities [Member] | Total Pledged [Member] | Pass Through Certificate [Member]    
Pledged Assets [Line Items]    
Financial Instruments, Owned and Pledged as Collateral, at Fair Value 4,081,596,000 3,692,811,000
Residential Mortgage Backed Securities [Member] | Total Pledged [Member] | Structured Finance [Member]    
Pledged Assets [Line Items]    
Financial Instruments, Owned and Pledged as Collateral, at Fair Value $ 38,904,000 $ 27,095,000