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SECURITIES (Details Textual) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]      
Available-For-Sale Securities, Other-Than-Temporary Impairment Unrealized Losses, Portion Recognized In Other Comprehensive Income   $ 230,000indb_AvailableForSaleSecuritiesOtherThanTemporaryImpairmentUnrealizedLossesPortionRecognizedInOtherComprehensiveIncome $ 2,300,000indb_AvailableForSaleSecuritiesOtherThanTemporaryImpairmentUnrealizedLossesPortionRecognizedInOtherComprehensiveIncome
Trading securities realized gain 285,000us-gaap_TradingSecuritiesRealizedGain    
Callable securities in investment portfolio   34,800,000indb_CallableSecuritiesInInvestmentPortfolio  
Investment securities pledged   $ 340,000,000us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged $ 360,100,000us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged