| Cover | Oct. 22, 2020 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Oct. 22, 2020 |
| Entity Registrant Name | Valley National Bancorp |
| Entity Incorporation, State or Country Code | NJ |
| Entity File Number | 1-11277 |
| Entity Tax Identification Number | 22-2477875 |
| Entity Address, Address Line One | One Penn Plaza, |
| Entity Address, City or Town | New York, |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10119 |
| City Area Code | 973 |
| Local Phone Number | 305-8800 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000714310 |
| Amendment Flag | false |
| The Nasdaq Stock Market LLC | Common Stock, no par value | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Common Stock, no par value |
| Trading Symbol | VLY |
| Security Exchange Name | NASDAQ |
| The Nasdaq Stock Market LLC | Non-Cumulative Perpetual Preferred Stock, Series A, no par value | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Non-Cumulative Perpetual Preferred Stock, Series A, no par value |
| Trading Symbol | VLYPP |
| Security Exchange Name | NASDAQ |
| The Nasdaq Stock Market LLC | Non-Cumulative Perpetual Preferred Stock, Series B, no par value | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Non-Cumulative Perpetual Preferred Stock, Series B, no par value |
| Trading Symbol | VLYPO |
| Security Exchange Name | NASDAQ |
