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Organization, Basis of Presentation, and Impact of Recent Accounting Pronouncements - Additional Information (Details) | 9 Months Ended |
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Sep. 30, 2021 Branch $ / shares | Dec. 31, 2020 $ / shares
Organization and Basis of Presentation [Line Items] |  |
Common stock, par | $ / shares | $ 0.01 | $ 0.01
Description of nine stock splits | 0.93 per share on a split-adjusted basis, reflecting the impact of nine stock splits between 1994 and 2004 |
New York Community Bank |  |
Organization and Basis of Presentation [Line Items] |  |
Number of branches | Branch | 236 |
New York Community Bank | Corporate Segment |  |
Organization and Basis of Presentation [Line Items] |  |
Number of branches | Branch | 19 |
New York Community Bank | Corporate and Other |  |
Organization and Basis of Presentation [Line Items] |  |
Number of branches | Branch | 217 |
IPO |  |
Organization and Basis of Presentation [Line Items] |  |
Shares issued, price per share | $ / shares | $ 25.00 |
Shares issued, price per share, split adjusted basis | $ / shares | $ 0.93 |

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- Definition Description of the stock split arrangement. Also provide the retroactive effect given by a stock split that occurs after the balance date but before the release of financial statements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 4.C) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187143-122770 + Details
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