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Revenue Recognition Contract with Customer, Asset (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Revenue from Contract with Customer [Abstract] |  |
Investment Management Income Receivable | $ 1,892 | $ 1,934

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_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration