Credit Risk Management and ACL for Loans - Interest Lost On Non-accrual Loans (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Receivables [Abstract]
Income that would have been recognized if non-accrual loans had been on accrual	$ 2,097	$ 1,285	$ 1,083
Less income recognized	628	191	1,050
Reduction in interest income	$ 1,469	$ 1,094	$ 33

Reflects the net amount of additional interest income (less interest recognized) that would have been recorded if nonaccrual loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period).

No definition available.

Name:	ebtc_FinancingReceivableInterestLossOnNonaccrualLoansNet
Namespace Prefix:	ebtc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration