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Cover - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2023
Feb. 15, 2024
Jun. 30, 2023
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 1-13991    
Entity Registrant Name MFA FINANCIAL, INC.    
Entity Incorporation, State or Country Code MD    
Entity Tax Identification Number 13-3974868    
Entity Address, Address Line One One Vanderbilt Ave., 48th Floor    
Entity Address, City or Town New York    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 10017    
City Area Code 212    
Local Phone Number 207-6400    
Title of 12(g) Security None    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Entity Public Float     $ 1.1
Entity Common Stock, Shares Outstanding   102,082,499  
Documents Incorporated by Reference
Portions of the registrant’s proxy statement to be filed with the Securities and Exchange Commission in connection with the Annual Meeting of Stockholders scheduled to be held on or about June 4, 2024, are incorporated by reference into Part III of this Annual Report on Form 10-K.
    
Entity Central Index Key 0001055160    
Amendment Flag false    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
8.875% Senior Notes Due 2029      
Entity Information [Line Items]      
Title of 12(b) Security 8.875% Senior Notes due 2029    
Trading Symbol MFAN    
Security Exchange Name NYSE    
Common Stock      
Entity Information [Line Items]      
Title of 12(b) Security Common Stock, par value $0.01 per share    
Trading Symbol MFA    
Security Exchange Name NYSE    
Series B Preferred Stock      
Entity Information [Line Items]      
Title of 12(b) Security 7.50% Series B Cumulative RedeemablePreferred Stock, par value $0.01 per share    
Trading Symbol MFA/PB    
Security Exchange Name NYSE    
Series C Preferred Stock      
Entity Information [Line Items]      
Title of 12(b) Security 6.50% Series C Fixed-to-Floating Rate Cumulative RedeemablePreferred Stock, par value $0.01 per share    
Trading Symbol MFA/PC    
Security Exchange Name NYSE