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Loans and Leases - Summary of Interest Income on Non accrual loans (Details) - Non-Covered Loans - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income that would have been recorded	$ 4,491	$ 5,599	$ 4,145
Interest income actually recorded	(939)	(3,409)	(3,480)
Interest income foregone	$ 3,552	$ 2,190	$ 665

X

- Definition

Reflects the amount of interest income on impaired and nonperforming loans that would have been recorded during the reporting period.

+ References

No definition available.

+ Details

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

X

- Definition

Financing Receivable, Impaired, Interest Lost on Non Accrual Loans

+ References

No definition available.

+ Details

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Namespace Prefix:	nycb_
Data Type:	xbrli:monetaryItemType
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X

- Definition

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.

+ References

No definition available.

+ Details

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

- Definition

Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524

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- Details

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