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Document and Entity Information
Aug. 04, 2020
Document And Entity Information [Line Items]  
Entity Registrant Name DYNEX CAPITAL INC
Amendment Flag false
Entity Central Index Key 0000826675
Document Type 8-K
Document Period End Date Aug. 04, 2020
Entity Incorporation State Country Code VA
Entity File Number 1-9819
Entity Tax Identification Number 52-1549373
Entity Address, Address Line One 4991 Lake Brook Drive
Entity Address, Address Line Two Suite 100
Entity Address, City or Town Glen Allen
Entity Address, State or Province VA
Entity Address, Postal Zip Code 23060-9245
City Area Code (804)
Local Phone Number 217-5800
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Common Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Common Stock, par value $.01 per share
Trading Symbol DX
Security Exchange Name NYSE
Series B Preferred Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 7.625% Series B Cumulative Redeemable Preferred Stock, par value $0.01 per share
Trading Symbol DXPRB
Security Exchange Name NYSE
Series C Preferred Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 6.900% Series C Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock, par value $0.01 per share
Trading Symbol DXPRC
Security Exchange Name NYSE