Name:	nymt_CDOsOutstanding
Namespace Prefix:	nymt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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

No definition available.

Name:	nymt_FinancingReceivableAllowanceForCreditLossesBasisPoints
Namespace Prefix:	nymt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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

No definition available.

Name:	nymt_ModifiedPercent
Namespace Prefix:	nymt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The aggregate number of delinquent loans.

No definition available.

Name:	nymt_NumberOfDelinquentLoans
Namespace Prefix:	nymt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

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

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=49124121&loc=SL6953423-111524

Name:	us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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.

No definition available.

Name:	us-gaap_MortgageLoansOnRealEstateLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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.

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