ACL for Loans - Impaired Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	$ 31,374	$ 30,112
Total Recorded Investment in Collateral Dependent Loans	28,695	26,923
Recorded Investment without a Specific Reserve	16,655	8,096
Recorded Investment with a Specific Reserve	12,040	18,827
Related Specific Reserve	5,448	6,180
Commercial real estate owner-occupied
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	3,351	2,921
Total Recorded Investment in Collateral Dependent Loans	2,811	2,374
Recorded Investment without a Specific Reserve	2,811	2,374
Recorded Investment with a Specific Reserve	0	0
Related Specific Reserve	0	0
Commercial real estate non owner-occupied
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	3,634	4,368
Total Recorded Investment in Collateral Dependent Loans	3,032	3,457
Recorded Investment without a Specific Reserve	2,133	2,532
Recorded Investment with a Specific Reserve	899	925
Related Specific Reserve	340	185
Commercial and industrial
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	6,411	5,507
Total Recorded Investment in Collateral Dependent Loans	5,311	4,184
Recorded Investment without a Specific Reserve	950	921
Recorded Investment with a Specific Reserve	4,361	3,263
Related Specific Reserve	1,753	2,346
Commercial construction
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	15,433	14,824
Total Recorded Investment in Collateral Dependent Loans	15,183	14,639
Recorded Investment without a Specific Reserve	8,403	0
Recorded Investment with a Specific Reserve	6,780	14,639
Related Specific Reserve	3,355	3,649
Residential mortgages
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	2,244	2,347
Total Recorded Investment in Collateral Dependent Loans	2,105	2,161
Recorded Investment without a Specific Reserve	2,105	2,161
Recorded Investment with a Specific Reserve	0	0
Related Specific Reserve	0	0
Home equity
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	301	145
Total Recorded Investment in Collateral Dependent Loans	253	108
Recorded Investment without a Specific Reserve	253	108
Recorded Investment with a Specific Reserve	0	0
Related Specific Reserve	0	0
Consumer
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	0	0
Total Recorded Investment in Collateral Dependent Loans	0	0
Recorded Investment without a Specific Reserve	0	0
Recorded Investment with a Specific Reserve	0	0
Related Specific Reserve	$ 0	$ 0

ENTERPRISE BANCORP INC /MA/ 10-Q