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REVENUE RECOGNITION CONTRACT WITH CUSTOMER (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract] |  |
Investment Management Income Receivable | $ 5,385 | $ 4,636

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

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- References No definition available. + Details
Name: | us-gaap_ContractWithCustomerAssetAndLiabilityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration