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Organization, Basis of Presentation, and Impact of Recent Accounting Pronouncements - Additional Information (Details) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 USD ($) Branch $ / shares | Dec. 31, 2020 Branch $ / shares | Dec. 31, 2019 $ / shares | Nov. 23, 1993 $ / shares
Organization and Basis of Presentation [Line Items] |  |  |  |
Common stock, par | $ / shares | $ 0.01 | $ 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) | ($0.93 per share on a split-adjusted basis, reflecting the impact of nine stock splits between 1994 and 2004). |  |
Cumulative effect on retained earnings, reduction in tax | $ | $ 10.5 |  |  |
Accounting Standards Update [Extensible List] | Accounting Standards Update 2016-13 | Accounting Standards Update 2016-13 |  |
New York Community Bank |  |  |  |
Organization and Basis of Presentation [Line Items] |  |  |  |
Number of branches | Branch | 237 | 237 |  |
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 | 218 |  |  |
IPO |  |  |  |
Organization and Basis of Presentation [Line Items] |  |  |  |
Shares issued, price per share | $ / shares | $ 25.00 |  |  | $ 25.00
Shares issued, price per share, split adjusted basis | $ / shares | $ 0.93 | $ 0.93 |  |

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