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Organization and Basis of Presentation - Additional Information (Detail) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 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). |  |
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 | 225 |  |
New York Community Bank | Directly Operated Banks |  |  |
Organization and Basis Of Presentation [Line Items] |  |  |
Number of branches | 2 |  |
New York Community Bank | Seven Divisional Banks |  |  |
Organization and Basis Of Presentation [Line Items] |  |  |
Number of branches | 223 |  |
New York Commercial Bank |  |  |
Organization and Basis Of Presentation [Line Items] |  |  |
Number of branches | 30 |  |
New York Commercial Bank | Atlantic Bank |  |  |
Organization and Basis Of Presentation [Line Items] |  |  |
Number of branches | 18 |  |

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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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://www.xbrl.org/2003/role/presentationRef -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=27012166&loc=d3e187143-122770 + Details
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