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Reconciliation of Statutory Federal Income Tax (Benefit) Expense Reported in Net Income to Combined Actual Income Tax (Benefit) Expense (Parenthetical) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)
Reconciliation of Provision of Income Taxes [Line Items]
Income tax (benefit) expense, adjustment to deferred taxes	$ (1.4)

X

- Definition

Reconciliation of Provision of Income Taxes [Line Items]

+ References

No definition available.

+ Details

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Namespace Prefix:	nyb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319

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Balance Type:	debit
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