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Subsequent Event (Additional Information) (Details) - Subsequent Event [Member] $ / shares in Units, $ in Billions	Apr. 26, 2021 USD ($) State Branch Office $ / shares
Subsequent Event [Line Items]
Ownership percent expected to be owned	68.00%
Flagstar [Member]
Subsequent Event [Line Items]
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 | Branch	400
Number of retail home lending offices | Office	87
Number of state footprint | State	28
Ownership percent expected to be owned	32.00%
Number of states of traditional branches | State	9

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Business combination estimated total assets after merge

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- Definition

Implied total transaction value.

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- Definition

Number of retail home lending offices.

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- Definition

Number of state footprint

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- Definition

Number of states of traditional branches

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- Definition

Number of Traditional Branches

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- Definition

Ownership Percent expected to be owned

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- 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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- Definition

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

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- Definition

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

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-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.

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