XML 49 R36.htm IDEA: XBRL DOCUMENT
v3.23.2

Derivatives Volume of Activity (Details) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2023 USD ($)
Not Designated as Hedging Instrument, Economic Hedge | U.S. Treasury futures | Short position |
Derivatives [Roll Forward] |
Derivative, Notional Amount | $ 4,920,000
Derivative, Notional Amount, Derivative Instruments Added | 10,440,000
Derivative, Notional Amount, Derivative Instruments Maturing, Settled, Terminated, or Paired-Off | (10,460,000)
Derivative, Notional Amount | 4,900,000
Not Designated as Hedging Instrument, Economic Hedge | Options on U.S. Treasury futures |
Derivatives [Roll Forward] |
Derivative, Notional Amount | 250,000
Derivative, Notional Amount, Derivative Instruments Added | 250,000
Derivative, Notional Amount, Derivative Instruments Maturing, Settled, Terminated, or Paired-Off | (500,000)
Derivative, Notional Amount | 0
Not Designated as Hedging Instrument, Trading | TBA securities | Long position |
Derivatives [Roll Forward] |
Derivative, Notional Amount | 2,869,000
Derivative, Notional Amount, Derivative Instruments Added | 19,045,000
Derivative, Notional Amount, Derivative Instruments Maturing, Settled, Terminated, or Paired-Off | (19,738,000)
Derivative, Notional Amount | $ 2,176,000

X
- Definition Aggregate notional amount entered into in the period specified by the derivative(s). Expressed as an absolute value. + References No definition available. + Details
Name: | dx_DerivativeNotionalAmountDerivativeInstrumentsAdded
Namespace Prefix: | dx_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition Notional amount of derivative instrument maturing, settled, terminated, or paired-off during the period. + References No definition available. + Details
Name: | dx_DerivativeNotionalAmountDerivativeInstrumentsMaturingSettledTerminatedOrPairedOff
Namespace Prefix: | dx_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition Derivatives + References No definition available. + Details
Name: | dx_DerivativesRollForward
Namespace Prefix: | dx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-1B Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-1A + Details
Name: | us-gaap_DerivativeNotionalAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_NotDesignatedAsHedgingInstrumentEconomicHedgeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_FutureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PositionAxis=us-gaap_ShortMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ExchangeTradedOptionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_NotDesignatedAsHedgingInstrumentTradingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForwardContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PositionAxis=us-gaap_LongMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |