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Offsetting Assets and Liabilities Offsetting Assets and Liabilities (Notes) | 12 Months Ended
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Dec. 31, 2016
Offsetting [Abstract] |
Offsetting Assets and Liabilities [Text Block] | OFFSETTING ASSETS AND LIABILITIES The Company's repurchase agreements and derivatives are subject to underlying agreements with master netting or similar arrangements, which provide for the right of offset in the event of default or in the event of bankruptcy of either party to the transactions. The Company reports its assets and liabilities subject to these arrangements on a gross basis. The following tables present information regarding those assets and liabilities subject to such arrangements as if the Company had presented them on a net basis as of December 31, 2016 and December 31, 2015:
| Offsetting of Assets
| Gross Amount of Recognized Assets |  | Gross Amount Offset in the Balance Sheet |  | Net Amount of Assets Presented in the Balance Sheet |  | Gross Amount Not Offset in the Balance Sheet (1) |  | Net Amount
Financial Instruments Received as Collateral |  | Cash Received as Collateral
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |
Derivative assets | $ | 28,534 |  |  | $ | — |  |  | $ | 28,534 |  |  | $ | (6,449 | ) |  | $ | (22,085 | ) |  | $ | — |
December 31, 2015: |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative assets | $ | 7,835 |  |  | $ | — |  |  | $ | 7,835 |  |  | $ | (7,835 | ) |  | $ | — |  |  | $ | — |
| Offsetting of Liabilities
| Gross Amount of Recognized Liabilities |  | Gross Amount Offset in the Balance Sheet |  | Net Amount of Liabilities Presented in the Balance Sheet |  | Gross Amount Not Offset in the Balance Sheet (1) |  | Net Amount
Financial Instruments Posted as Collateral |  | Cash Posted as Collateral
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |
Derivative liabilities | $ | 6,922 |  |  | $ | — |  |  | $ | 6,922 |  |  | $ | (6,913 | ) |  | $ | — |  |  | $ | 9 |
Repurchase agreements | 2,898,952 |  |  | — |  |  | 2,898,952 |  |  | (2,898,952 | ) |  | — |  |  | — |
| $ | 2,905,874 |  |  | $ | — |  |  | $ | 2,905,874 |  |  | $ | (2,905,865 | ) |  | $ | — |  |  | $ | 9 |
December 31, 2015: |  |  |  |  |  |  |  |  |  |  |
Derivative liabilities | $ | 41,205 |  |  | $ | — |  |  | $ | 41,205 |  |  | $ | (9,079 | ) |  | $ | (32,111 | ) |  | $ | 15 |
Repurchase agreements | 2,589,420 |  |  | — |  |  | 2,589,420 |  |  | (2,589,420 | ) |  | — |  |  | — |
| $ | 2,630,625 |  |  | $ | — |  |  | $ | 2,630,625 |  |  | $ | (2,598,499 | ) |  | $ | (32,111 | ) |  | $ | 15 |
(1) | Amounts disclosed for collateral received by or posted to the same counterparty include cash and the fair value of MBS up to and not exceeding the net amount of the asset or liability presented in the balance sheet. The fair value of the actual collateral received by or posted to the same counterparty may exceed the amounts presented.

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- Definition The entire disclosure for financial assets and liabilities that are subject to offsetting, including master netting arrangements. + References No definition available. + Details
Name: | dx_OffsettingAssetsandLiabilitiesTextBlock
Namespace Prefix: | dx_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_OffsettingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration