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REVENUE RECOGNITION CONTRACT WITH CUSTOMER (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Contract with Customer, Asset and Liability [Abstract] |  |
Investment Management Income Receivable | $ 2,341 | $ 1,893

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