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Derivative Instruments and Hedging Activities - Activity of Derivative Instruments Not Designated as Hedges (Details) - Trading - Interest Rate Swap $ in Thousands | 9 Months Ended
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Sep. 30, 2020 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Roll Forward] |
Beginning balance | $ 495,500
Additions | 0
Terminations | (495,500)
Ending balance | $ 0

X
- Definition Derivative Asset (Liability), Notional Amount + References No definition available. + Details
Name: | nymt_DerivativeAssetLiabilityNotionalAmount
Namespace Prefix: | nymt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Derivative Instruments and Hedging Activities Disclosures [Roll Forward] + References No definition available. + Details
Name: | nymt_DerivativeInstrumentsandHedgingActivitiesDisclosuresRollForward
Namespace Prefix: | nymt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Additions for notional amount of other derivatives.. + References No definition available. + Details
Name: | nymt_NotionalAmountOfOtherDerivativeAdditions
Namespace Prefix: | nymt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Settlement, expiration, or exercise for notional amount of other derivatives. + References No definition available. + Details
Name: | nymt_NotionalAmountOfOtherDerivativesSettlementExpirationOrExercise
Namespace Prefix: | nymt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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_InterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |