Cover Page - USD ($)
12 Months Ended
Dec. 31, 2020
Feb. 16, 2021
Jun. 30, 2020
Entity Information [Line Items]   
Document Type10-K  
Document Annual Reporttrue  
Document Period End DateDec. 31, 2020  
Document Transition Reportfalse  
Entity File Number001-34766  
Entity Registrant NameARMOUR RESIDENTIAL REIT, INC.  
Entity Incorporation, State or Country CodeMD  
Entity Tax Identification Number26-1908763  
Entity Address, Address Line One3001 Ocean Drive, Suite 201  
Entity Address, City or TownVero Beach  
Entity Address, State or ProvinceFL  
Entity Address, Postal Zip Code32963  
City Area Code772  
Local Phone Number617-4340  
Entity Well-known Seasoned IssuerYes  
Entity Voluntary FilersNo  
Entity Current Reporting StatusYes  
Entity Interactive Data CurrentYes  
Entity Filer CategoryLarge Accelerated Filer  
Entity Small Businessfalse  
Entity Emerging Growth Companyfalse  
ICFR Auditor Attestation Flagtrue  
Entity Shell Companyfalse  
Entity Public Float  $ 597,492,827
Entity Common Stock, Shares Outstanding (in shares) 65,290,733 
Documents Incorporated by ReferenceCertain portions of the registrant’s definitive proxy statement pursuant to Regulation 14A of the Securities Exchange Act of 1934 for its 2021 annual meeting of stockholders are incorporated by reference into Part III of this Form 10-K.  
Entity Central Index Key0001428205  
Current Fiscal Year End Date--12-31  
Document Fiscal Year Focus2020  
Document Fiscal Period FocusFY  
Amendment Flagfalse  
Series C Preferred Stock   
Entity Information [Line Items]   
Title of 12(b) SecurityPreferred Stock, 7.00% Series C Cumulative Redeemable  
Trading SymbolARR-PRC  
Security Exchange NameNYSE  
Common Stock   
Entity Information [Line Items]   
Title of 12(b) SecurityCommon Stock, $0.001 par value  
Trading SymbolARR  
Security Exchange NameNYSE  

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