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Comprehensive Income/Loss (Details Textual) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2009
--- | --- | --- | ---
Equity [Abstract] |  |  |
Gain on interest rate swaps | $ 78 | $ 137 | $ 1,400

X
- Definition Deferred gain or loss on cash flow hedge. + References No definition available. + Details
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Namespace Prefix: | indb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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