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Leases - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2019 USD ($)
Operating Lease, Weighted Average Remaining Lease Term	17 years 4 months 24 days
Lessee, Operating Lease, Option to Extend	The vast majority of which include one or more options to extend the leases for up to five years resulting in lease terms up to 40 years.
Amortization Of ROU assets	$ 11,700
Discontinued Operations [Member]
Amortization Of ROU assets	$ 7,300,000
Minimum [Member]
Operating Lease, Weighted Average Remaining Lease Term	1 year
Maximum [Member]
Operating Lease, Weighted Average Remaining Lease Term	25 years

X

- Definition

Amount of amortization expense attributable to right-of-use asset from operating lease right-of-use asset.

+ References

No definition available.

+ Details

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Namespace Prefix:	nycb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Description of terms and conditions of option to extend lessee's operating lease. Includes, but is not limited to, information about option recognized as part of right-of-use asset and lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

+ Details

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

X

- Definition

Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 55
-Paragraph 53
-URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	instant

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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- Details

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Namespace Prefix:
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