Loans, Allowance for Credit Losses and Credit Quality - Troubled Debt Restructuring (Details)	Dec. 31, 2022 USD ($)
Receivables [Abstract]
TDRs on accrual status	$ 11,278,000
TDRs on nonaccrual	11,520,000
Total TDRs	$ 22,798,000

Troubled Debt Restructurings recorded investment that are on nonaccrual status as of the balance sheet date.

No definition available.

Name:	indb_TdrsRecordedInvestmentOnNonaccrualStatus
Namespace Prefix:	indb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant