Name:	dx_AmountOutstandingWithCounterparty
Namespace Prefix:	dx_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	dx_CounterpartyInformationLineItems
Namespace Prefix:	dx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Number of counterparties with whom the Company has borrowing agreements.

No definition available.

Name:	dx_NumberOfCounterpartiesBorrowingAvailability
Namespace Prefix:	dx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Number of lending counterparties with whom the Company has amounts outstanding as of reporting period.

No definition available.

Name:	dx_NumberOfCounterpartiesBorrowingsOutstanding
Namespace Prefix:	dx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Represents the percentage of equity at risk under all repurchase agreements with a particular counterparty where equity at risk is defined as the excess of carrying amount (or market value, if higher than the carrying amount) of the securities or other assets pledged as collateral to secure the repurchase agreement borrowings over the amount of the repurchase liability outstanding.

No definition available.

Name:	dx_RepurchaseAgreementCounterpartyPercentOfEquityAtRisk
Namespace Prefix:	dx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Weighted average interest rate on all amounts outstanding with a particular counterparty for whom the amount of equity at risk exceeds 10% of the Company's shareholder's equity.

No definition available.

Name:	dx_WeightedAverageInterestRateAmountOutstandingWithCounterparty
Namespace Prefix:	dx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Amount borrowed under the credit facility as of the balance sheet date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

Name:	us-gaap_LineOfCreditFacilityAmountOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The effective interest rate at the end of the reporting period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5