Summary of Significant Accounting Policies - Narrative (Details)	12 Months Ended
	Dec. 31, 2024 payment segment branch property plan reportingUnit shares	Dec. 08, 2024 $ / shares	Jul. 31, 2000 branch
Summary of Significant Accounting Policies [Line Items]
Number of branches | branch	27
Number of strategic units | reportingUnit	1
Number of operating segments | segment	1
Number of reportable segments | segment	1
Number of days a loan must be paid current before accrual of interest is resumed	180 days
Number of offices related to the goodwill in acquisition | branch			2
Number of active individual stock incentive plans | plan	1
Shares remained available for future grants (in shares) | shares	270,474
Number of NMTC investments | property	1
NMTC investment, amortization period	7 years
Enterprise Bancorp Inc | Independent Bank Corp.
Summary of Significant Accounting Policies [Line Items]
Share conversion ratio		0.60
Share price (in dollars per share) | $ / shares		$ 2.00
Residential mortgages
Summary of Significant Accounting Policies [Line Items]
Early payment default period | payment	4
Lines of Credit and Demand Notes | Minimum
Summary of Significant Accounting Policies [Line Items]
Period that loan deferred income is amortized	3 years
Lines of Credit and Demand Notes | Maximum
Summary of Significant Accounting Policies [Line Items]
Period that loan deferred income is amortized	5 years