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Organization, Basis of Presentation and Recently Adopted Accounting Standards - Additional Information (Detail) $ / shares in Units, $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 USD ($) Location $ / shares | Dec. 31, 2019 $ / shares | Nov. 23, 1993 $ / 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). |  |
Accounting Standards Update 2016-13 [Member] |  |  |
Organization and Basis Of Presentation [Line Items] |  |  |
Cumulative Effect on Retained Earnings, Net of Tax | $ | $ 10.5 |  |
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 |  |
New York Community Bank |  |  |
Organization and Basis Of Presentation [Line Items] |  |  |
Number of branches | Location | 237 |  |
New York Community Bank | Corporate Segment [Member] |  |  |
Organization and Basis Of Presentation [Line Items] |  |  |
Number of branches | Location | 19 |  |
New York Community Bank | Corporate and Other [Member] |  |  |
Organization and Basis Of Presentation [Line Items] |  |  |
Number of branches | Location | 218 |  |

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