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REVENUE RECOGNITION CONTRACT WITH CUSTOMER (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract]
Investment Management Income Receivable	$ 5,261	$ 5,385

X

- Definition

Fees earned from investment management wealth and advisory services but not yet received as of the end of the reporting period.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	us-gaap_ContractWithCustomerAssetAndLiabilityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration