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PLEDGED ASSETS - Assets Pledged to Counterparties (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Pledged Assets [Line Items]    
Financial Instruments, Owned and Pledged as Collateral, at Fair Value $ 6,506,372 $ 3,719,906
Accrued interest receivable 18,859 9,721
OtherReceivablesFromBrokerDealersAndClearingOrganizations 0 414
Restricted cash 65,299 79,363
Total Assets Pledged To Counterparties 6,620,228 3,808,905
Repurchase Agreement [Member]    
Pledged Assets [Line Items]    
Restricted cash 57,264 58,829
Total Assets Pledged To Counterparties 6,582,440 3,788,371
Derivative [Member]    
Pledged Assets [Line Items]    
Restricted cash 8,035 20,534
Total Assets Pledged To Counterparties 37,788 20,534
Residential Mortgage Backed Securities [Member]    
Pledged Assets [Line Items]    
Accrued interest receivable 18,817 9,636
Residential Mortgage Backed Securities [Member] | Pass Through Certificate [Member]    
Pledged Assets [Line Items]    
Financial Instruments, Owned and Pledged as Collateral, at Fair Value 6,294,102 3,692,811
Residential Mortgage Backed Securities [Member] | Structured Finance [Member]    
Pledged Assets [Line Items]    
Financial Instruments, Owned and Pledged as Collateral, at Fair Value 212,270 27,095
Residential Mortgage Backed Securities [Member] | Repurchase Agreement [Member]    
Pledged Assets [Line Items]    
Accrued interest receivable 18,804 9,636
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 6,294,102 3,692,811
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 212,270 27,095
Residential Mortgage Backed Securities [Member] | Derivative [Member]    
Pledged Assets [Line Items]    
Accrued interest receivable 13 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
US Treasury Notes    
Pledged Assets [Line Items]    
Financial Instruments, Owned and Pledged as Collateral, at Fair Value 29,740  
US Treasury Notes | Repurchase Agreement [Member]    
Pledged Assets [Line Items]    
Financial Instruments, Owned and Pledged as Collateral, at Fair Value 0  
US Treasury Notes | Derivative [Member]    
Pledged Assets [Line Items]    
Financial Instruments, Owned and Pledged as Collateral, at Fair Value $ 29,740