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OTHER COMPREHENSIVE LOSS (Details Textual) $ in Millions	Dec. 31, 2009 USD ($)
Equity [Abstract]
Gain on interest rate swaps	$ 1.4

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

X

- References

No definition available.

+ Details

Name:	us-gaap_EquityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration