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v3.23.3

Derivative Instruments and Hedging Activities - Activity of Derivative Instruments Not Designated as Hedges (Details) - Trading - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2023
Options |  |
Derivative Instruments and Hedging Activities Disclosures [Roll Forward] |  |
Beginning balance | $ 81 | $ 0
Additions | 0 | 500,148
Terminations | (81) | (500,148)
Ending balance | 0 | 0
Interest rate swaps |  |
Derivative Instruments and Hedging Activities Disclosures [Roll Forward] |  |
Beginning balance | 900,925 | 0
Additions | 1,356,309 | 2,257,234
Terminations | 0 | 0
Ending balance | $ 2,257,234 | $ 2,257,234

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- Definition Derivative Asset (Liability), Notional Amount + References No definition available. + Details
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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_StockOptionMember
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: |