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v3.23.2

Derivative Instruments and Hedging Activities - Activity of Derivative Instruments Not Designated as Hedges (Details) - Trading - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2023
Options |  |
Derivative Instruments and Hedging Activities Disclosures [Roll Forward] |  |
Beginning balance | $ 500,053 | $ 0
Additions | 95 | 500,148
Terminations | (500,067) | (500,067)
Ending balance | 81 | 81
Interest rate swaps |  |
Derivative Instruments and Hedging Activities Disclosures [Roll Forward] |  |
Beginning balance | 341,300 | 0
Additions | 559,625 | 900,925
Terminations | 0 | 0
Ending balance | $ 900,925 | $ 900,925

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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
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- Definition Additions for notional amount of other derivatives.. + References No definition available. + Details
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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
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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: |