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Repurchase Agreements - Narrative (Details) $ in Thousands | Dec. 31, 2023 USD ($) counterparty | Dec. 31, 2022 USD ($)
--- | --- | ---
Disclosure of Repurchase Agreements [Abstract] |  |
Number of counterparties | counterparty | 28 |
Due to counterparties | $ | $ 95 | $ 4,159

X
- Definition Number of lending counterparties with whom the Company has amounts outstanding as of reporting period. + References No definition available. + Details
Name: | dx_NumberOfCounterpartiesBorrowingsOutstanding
Namespace Prefix: | dx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition Amount of other payables due to broker-dealers or clearing organizations. + References No definition available. + Details
Name: | us-gaap_OtherPayablesToBrokerDealersAndClearingOrganizations
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant