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Residential Mortgage Loans Held in Securitization Trusts, Net and Real Estate Owned - Narrative (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018 USD ($) loan	Dec. 31, 2017 USD ($) loan	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Mortgage Loans on Real Estate [Line Items]
Allowance for loan losses	$ 4,081	$ 4,191	$ 3,797	$ 3,782
Allowance for loan losses, basis points	5.48%	5.41%
CDOs outstanding	$ 4,600	$ 4,400
Residential Mortgage Loans Held in Securitization Trusts and Real Estate Owned Held in Residential Securitization
Mortgage Loans on Real Estate [Line Items]
Number of delinquent loans | loan	27	26
Principal amount of delinquent loans	$ 16,900	$ 16,500
Residential Mortgage Loans Held in Securitization Trusts and Real Estate Owned Held in Residential Securitization | Payment Deferral
Mortgage Loans on Real Estate [Line Items]
Principal amount of delinquent loans	$ 5,500	$ 10,200
Delinquent loans under modified payment, percent	33.00%	62.00%

X

- Definition

Represents Company’s net investment in the residential securitization trusts, which is the maximum amount of the Company’s investment that is at risk to loss and represents the difference between (i) the carrying amount of the mortgage loans and real estate owned held in residential securitization trusts and (ii) the amount of Residential CDOs outstanding.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

Represents allowance for loan losses expressed as basis points of the outstanding principal balance of residential loans held in securitization trusts.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Represents the percentage of delinquent loans that are currently under some form of modified payment plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	nymt_
Data Type:	num:percentItemType
Balance Type:	na
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X

- Definition

The aggregate number of delinquent loans.

+ References

No definition available.

+ Details

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Namespace Prefix:	nymt_
Data Type:	xbrli:integerItemType
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X

- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

Amount of principal due on loans that have been delinquent, which may exclude loans having interest delinquent for three months or less, as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29.10(a))
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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- Details

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