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Subsequent Event - Additional Information (Details) - Subsequent Event [Member] $ / shares in Units, $ in Billions	Apr. 26, 2021 USD ($) States Branches Office $ / shares
Subsequent Event [Line Items]
Ownership percent expected to be owned	68.00%
Flagstar [Member]
Subsequent Event [Line Items]
Ownership percent expected to be owned	32.00%
Percentage of stock transaction value	100.00%
Implied total transaction value | $	$ 2.6
Business acquisition, share price | $ / shares	$ 4.0151
Business combination, description	Following completion of the transaction, New York Community shareholders are expected to own 68% of the combined company, while Flagstar shareholders are expected to own 32% of the combined company.
Business combination estimated total assets after merge | $	$ 87.0
Number of traditional branches | Branches	400
Number of retail home lending offices | Office	87
Number of state footprint | States	28
Number of states of traditional branches | States	9

X

- Definition

Business combination estimated total assets after merge.

+ References

No definition available.

+ Details

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Namespace Prefix:	nycb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

Implied total transaction value.

+ References

No definition available.

+ Details

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Balance Type:	credit
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- Definition

Number of retail home lending offices.

+ References

No definition available.

+ Details

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Namespace Prefix:	nycb_
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Balance Type:	na
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- Definition

Number of state footprint.

+ References

No definition available.

+ Details

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Namespace Prefix:	nycb_
Data Type:	xbrli:integerItemType
Balance Type:	na
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X

- Definition

Number of states of traditional branches.

+ References

No definition available.

+ Details

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Namespace Prefix:	nycb_
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Balance Type:	na
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- Definition

Number of Traditional Branches.

+ References

No definition available.

+ Details

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Namespace Prefix:	nycb_
Data Type:	xbrli:integerItemType
Balance Type:	na
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X

- Definition

Ownership Percent expected to be owned

+ References

No definition available.

+ Details

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Namespace Prefix:	nycb_
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Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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Balance Type:	na
Period Type:	instant

X

- Definition

Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

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- Definition

This element represents a description of how the entity obtained control of the acquired entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

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- Details

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