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Cover - USD ($)
 12 Months Ended
Dec. 31, 2024
Feb. 28, 2025
Jun. 30, 2024
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2024    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-33912    
Entity Registrant Name Enterprise Bancorp, Inc.    
Entity Incorporation, State or Country Code MA    
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    
Title of 12(b) Security Common Stock, $0.01 par value per share    
Trading Symbol EBTC    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Entity Public Float     $ 244,831,574
Entity Common Stock, Shares Outstanding   12,458,981  
Documents Incorporated by Reference
Portions of the registrant’s definitive proxy statement for its annual meeting of shareholders to be held on May 6, 2025, are incorporated by reference in Part III of this Form 10-K.
    
Entity Central Index Key 0001018399    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Amendment Flag false