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Derivative Instruments and Hedging Activities - Activity of Derivative Instruments Not Designated as Hedges (Details) - Trading $ in Thousands | 12 Months Ended
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Dec. 31, 2023 USD ($)
Interest rate caps |
Derivative Instruments and Hedging Activities Disclosures [Roll Forward] |
Beginning balance | $ 140,000
Additions and Transfers | 410,025
Terminations | 0
Ending balance | 550,025
Options |
Derivative Instruments and Hedging Activities Disclosures [Roll Forward] |
Beginning balance | 0
Additions and Transfers | 500,206
Terminations | (500,206)
Ending balance | 0
Interest rate swaps |
Derivative Instruments and Hedging Activities Disclosures [Roll Forward] |
Beginning balance | 0
Additions and Transfers | 2,778,015
Terminations | 0
Ending balance | $ 2,778,015

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- 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

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

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

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

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_StockOptionMember
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Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |