| Cover | Oct. 21, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K/A |
| Document Period End Date | Oct. 21, 2021 |
| Entity Registrant Name | ENTERPRISE BANCORP, INC. |
| Entity Incorporation, State or Country Code | MA |
| Entity File Number | 001-33912 |
| Entity Tax Identification Number | 04-3308902 |
| Entity Address, Address Line One | 222 Merrimack Street |
| Entity Address, City or Town | Lowell, |
| Entity Address, State or Province | MA |
| Entity Address, Postal Zip Code | 01852 |
| City Area Code | (978) |
| Local Phone Number | 459-9000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Title of 12(b) Security | Common Stock, $0.01 par value per share |
| Trading Symbol | EBTC |
| Security Exchange Name | NASDAQ |
| Amendment Flag | true |
| Entity Central Index Key | 0001018399 |
| Amendment Description | This Current Report on Form 8-K/A (this “Amended Form 8-K”) amends and restates in its entirety the Current Report on Form 8-K (the “Original Form 8-K”) filed by Enterprise Bancorp, Inc. on October 21, 2021. The sole purpose of this Amended Form 8-K is to correct a typographical submission error in the first Item number referenced in the Original Form 8-K (Item 2.01) and re-submit the Original Form 8-K under the corrected Item number (Item 2.02, as noted in the original form itself).Other than as set forth in this Explanatory Note, no changes have been made to the Original Form 8-K. This Amended Form 8-K speaks as of the original filing date of the Original Form 8-K and does not reflect events that may have occurred after the date and time of the filing of the Original Form 8-K. |
