Document and Entity Information	3 Months Ended
	Mar. 31, 2014	May 02, 2014
Entity Information [Line Items]
Entity Registrant Name	DYNEX CAPITAL INC
Entity Central Index Key	0000826675
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2014
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q1
Amendment Flag	true
Amendment Description	Updated to reflect new XBRL data validations implemented since the Original Filing.
Entity Common Stock, Shares Outstanding		54,698,963
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes