| Document and Entity Information | Jan. 13, 2022 |
| Document And Entity Information [Line Items] | |
| Amendment Flag | false |
| Entity Central Index Key | 0000714310 |
| Document Type | 8-K |
| Document Period End Date | Jan. 13, 2022 |
| Entity Registrant Name | Valley National Bancorp |
| Entity Incorporation State 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 |
| Common Stock No Par Value [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Common Stock, no par value |
| Trading Symbol | VLY |
| Security Exchange Name | NASDAQ |
| Not Cumulative Perpetual Preferred Stock Series A No Par Value [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Non-Cumulative Perpetual Preferred Stock, Series A, no par value |
| Trading Symbol | VLYPP |
| Security Exchange Name | NASDAQ |
| Not Cumulative Perpetual Preferred Stock Series B No Par Value [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Non-Cumulative Perpetual Preferred Stock, Series B, no par value |
| Trading Symbol | VLYPO |
| Security Exchange Name | NASDAQ |
