Related Party Transactions (Notes)	12 Months Ended
Dec. 31, 2018
Related Party Transactions [Abstract]
Related Party Transactions Disclosure [Text Block]	RELATED PARTY TRANSACTIONSAs noted in previous filings, DCI Commercial, Inc. (“DCI”), a former affiliate of the Company and formerly known as Dynex Commercial, Inc., was named a party to several lawsuits in 1999 and 2000 regarding the activities of DCI while it was an operating subsidiary of an affiliate of the Company. The Company was named a party to several of the lawsuits (the “DCI Litigation”) due to its affiliation with DCI. In December 2000, the Company and DCI entered into a Litigation Cost Sharing Agreement (the “Agreement”) whereby the Company agreed to advance DCI's portion of the costs of defending against the DCI Litigation. All matters related to the DCI Litigation have concluded. As discussed in Part 1, Item 3 of this Annual Report on Form 10-K, plaintiffs in one matter are seeking to enforce a judgment obtained against DCI against the Company under various legal theories including pursuant to the Agreement. The Company continues to fund the costs of defense for DCI under the Agreement. DCI costs advanced by the Company are loans and bear simple interest at the rate of Prime plus 8.0% per annum. The Company's advances to cover DCI's costs during the years ended December 31, 2018, 2017, and 2016 were $307, $30, and $173, respectively. The total amount due to the Company under the Litigation Cost Sharing Agreement including interest was $11,396 as of December 31, 2018 compared to $10,615 as of December 31, 2017. Because DCI does not currently have any assets, the amount due as of December 31, 2018 has been fully reserved for collectability by the Company. DCI is currently wholly owned by a company unaffiliated with the Company. An executive of the Company is the sole shareholder of this unaffiliated company.

Related Party Transactions (Notes)

12 Months Ended

Dec. 31, 2018

RELATED PARTY TRANSACTIONSAs noted in previous filings, DCI Commercial, Inc. (“DCI”), a former affiliate of the Company and formerly known as Dynex Commercial, Inc., was named a party to several lawsuits in 1999 and 2000 regarding the activities of DCI while it was an operating subsidiary of an affiliate of the Company. The Company was named a party to several of the lawsuits (the “DCI Litigation”) due to its affiliation with DCI. In December 2000, the Company and DCI entered into a Litigation Cost Sharing Agreement (the “Agreement”) whereby the Company agreed to advance DCI's portion of the costs of defending against the DCI Litigation. All matters related to the DCI Litigation have concluded. As discussed in Part 1, Item 3 of this Annual Report on Form 10-K, plaintiffs in one matter are seeking to enforce a judgment obtained against DCI against the Company under various legal theories including pursuant to the Agreement. The Company continues to fund the costs of defense for DCI under the Agreement. DCI costs advanced by the Company are loans and bear simple interest at the rate of Prime plus 8.0% per annum. The Company's advances to cover DCI's costs during the years ended December 31, 2018, 2017, and 2016 were $307, $30, and $173, respectively. The total amount due to the Company under the Litigation Cost Sharing Agreement including interest was $11,396 as of December 31, 2018 compared to $10,615 as of December 31, 2017. Because DCI does not currently have any assets, the amount due as of December 31, 2018 has been fully reserved for collectability by the Company. DCI is currently wholly owned by a company unaffiliated with the Company. An executive of the Company is the sole shareholder of this unaffiliated company.