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Comprehensive Income/Loss (Details Textual) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2013
Equity [Abstract]
Gain on interest rate swaps	$ 317	$ 463	$ 1,400

X

- Definition

Deferred gain or loss on cash flow hedge.

+ References

No definition available.

+ Details

Name:	indb_DeferredGainLossOnCashFlowHedge
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