Quarterly report pursuant to Section 13 or 15(d)

REAL ESTATE AND OTHER SECURITIES - Summary of Real Estate Securities in an Unrealized Loss Position - Associated Intent to Sell (Details)

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REAL ESTATE AND OTHER SECURITIES - Summary of Real Estate Securities in an Unrealized Loss Position - Associated Intent to Sell (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Securities New Residential intends to sell    
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 0 $ 0
Amortized Cost Basis After Credit Impairment 0 0
Gross Unrealized Losses, Credit 0 0
Gross Unrealized Losses, Non-Credit 0 0
Securities New Residential is more likely than not to be required to sell    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 0 0
Amortized Cost Basis After Credit Impairment 0 0
Gross Unrealized Losses, Credit 0 0
Gross Unrealized Losses, Non-Credit 0  
Credit impaired securities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 8,501 21,326
Amortized Cost Basis After Credit Impairment 8,501 21,326
Gross Unrealized Losses, Credit (3,652) (8,672)
Gross Unrealized Losses, Non-Credit 0 0
Non-credit impaired securities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 4,314 270,821
Amortized Cost Basis After Credit Impairment 4,437 331,638
Gross Unrealized Losses, Credit 0 0
Gross Unrealized Losses, Non-Credit (123) (60,817)
Total debt securities in an unrealized loss position    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 12,815 292,147
Amortized Cost Basis After Credit Impairment 12,938 352,964
Gross Unrealized Losses, Credit (3,652) (8,672)
Gross Unrealized Losses, Non-Credit $ (123) $ (60,817)