| Document and Entity Information | Jan. 31, 2024 |
| Document And Entity Information [Line Items] | |
| Entity Registrant Name | NEW YORK COMMUNITY BANCORP INC |
| Amendment Flag | true |
| Entity Central Index Key | 0000910073 |
| Document Type | 8-K/A |
| Document Period End Date | Jan. 31, 2024 |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 1-31565 |
| Entity Tax Identification Number | 06-1377322 |
| Entity Address, Address Line One | 102 Duffy Avenue |
| Entity Address, City or Town | Hicksville |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 11801 |
| City Area Code | (516) |
| Local Phone Number | 683-4100 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Amendment Description | On January 31, 2024, New York Community Bancorp, Inc. (“NYCB” or the “Company”) filed a Current Report on Form 8-K furnishing under Items 2.02 and 9.01 the Company’s press release announcing its unaudited financial results for the fourth quarter and fiscal year ended December 31, 2023 (the “Original Filing”). The full text of the press release was included as Exhibit 99.1 to the Original Filing. This Amendment (this “Amendment”) to the Original Filing is being filed to reflect, among other things, (a) an adjustment related to a goodwill impairment, (b) certain measurement period adjustments impacting the Company’s bargain purchase gain and (c) an adjustment for a type 1 subsequent event, each as more fully described herein. Each of these adjustments were identified by NYCB’s management after the date of the Original Filing and as part of the Company’s customary procedures to finalize its financial statements for inclusion in its Annual Report on Form 10-K for the fiscal year ended December 31, 2023 (the “2023 Form 10-K”). |
| Common Stock [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Common stock, $0.01 par value per share |
| Trading Symbol | NYCB |
| Security Exchange Name | NYSE |
| Bifurcated Option Notes Unit Securities [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Bifurcated Option Note Unit Securities SM |
| Trading Symbol | NYCB PU |
| Security Exchange Name | NYSE |
| Fixed To Floating Rate Series A Noncumulative Perpetual Preferred Stock [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Fixed-to-Floating Rate Series A Noncumulative Perpetual Preferred Stock, $0.01 par value |
| Trading Symbol | NYCB PA |
| Security Exchange Name | NYSE |
