XML 93 R75.htm IDEA: XBRL DOCUMENT
v3.5.0.2

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

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