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Cover
Feb. 13, 2020
Document Information [Line Items]  
Document Type 8-K
Amendment Flag false
Document Period End Date Feb. 13, 2020
Current Fiscal Year End Date --12-31
Entity File Number 1-9819
Entity Registrant Name DYNEX CAPITAL, INC.
Entity Central Index Key 0000826675
Entity Tax Identification Number 52-1549373
Entity Incorporation, State or Country Code VA
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
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  
Document Information [Line Items]  
Title of 12(b) Security Common Stock, $0.01 par value
Trading Symbol DX
Security Exchange Name NYSE
Series A Preferred Stock  
Document Information [Line Items]  
Title of 12(b) Security 8.50% Series A Cumulative Redeemable Preferred Stock, $0.01 par value
Trading Symbol DXPRA
Security Exchange Name NYSE
Series B Preferred Stock  
Document Information [Line Items]  
Title of 12(b) Security 7.625% Series B Cumulative Redeemable Preferred Stock, $0.01 par value
Trading Symbol DXPRB
Security Exchange Name NYSE