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Organization and Basis of Presentation - Additional Information (Detail) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 Location $ / shares | Dec. 31, 2017 $ / 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). |  |
Number of branches | Location | 30 |  |
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 | 252 |  |
New York Community Bank | Directly Operated Banks |  |  |
Organization and Basis Of Presentation [Line Items] |  |  |
Number of branches | 19 |  |
New York Community Bank | Eight Divisional Banks |  |  |
Organization and Basis Of Presentation [Line Items] |  |  |
Number of branches | Location | 233 |  |

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