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Secured Borrowings Counterparty Information (Details) $ in Thousands | Dec. 31, 2016 USD ($) Agreements
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Counterparty Information [Line Items] |
Number of Counterparties with Borrowings Outstanding | Agreements | 19
Available Repurchase Agreement Counterparties | Agreements | 32
Wells Fargo Bank, N. A. and affiliates |
Counterparty Information [Line Items] |
Repurchase Agreement Counterparty, Amount at Risk | $ | $ 62,041
Borrowings outstanding with counterparty | $ | $ 342,160
WAVG interest rate for amount outstanding with named counterparty | 1.64%

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- Definition Amount represents the total debt outstanding with named counterparty when the amount of equity at risk with that counterparty exceeds 10% of the Company's shareholders' equity. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition [Line Items] for Counterparty Information [Table] + References No definition available. + Details
Name: | dx_CounterpartyInformationLineItems
Namespace Prefix: | dx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of counterparties with whom the Company has borrowing agreements. + References No definition available. + Details
Name: | dx_NumberOfCounterpartiesBorrowingAvailability
Namespace Prefix: | dx_
Data Type: | xbrli:integerItemType
Balance Type: | na
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- Definition Number of lending counterparties with whom the Company has amounts outstanding as of reporting period. + References No definition available. + Details
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Namespace Prefix: | dx_
Data Type: | xbrli:integerItemType
Balance Type: | na
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- Definition Weighted average interest rate on amounts outstanding with a particular counterparty for whom the amount of equity at risk exceeds 10% of the Company's shareholders' equity. + References No definition available. + Details
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- Definition The amount at risk under repurchase agreements is defined as the excess of carrying amount (or market value, if higher than the carrying amount or if there is no carrying amount) of the securities or other assets sold under agreement to repurchase, including accrued interest plus any cash or other assets on deposit to secure the repurchase obligation, over the amount of the repurchase liability (adjusted for accrued interest). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)(B)(iii)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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Period Type: | instant

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- Details
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