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Securities (Details Textual) (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Securities (Textual) [Abstract]      
Available-For-Sale Securities, Other-Than-Temporary Impairment Unrealized Losses, Portion Recognized In Other Comprehensive Income $ 146,000indb_AvailableForSaleSecuritiesOtherThanTemporaryImpairmentUnrealizedLossesPortionRecognizedInOtherComprehensiveIncome   $ 230,000indb_AvailableForSaleSecuritiesOtherThanTemporaryImpairmentUnrealizedLossesPortionRecognizedInOtherComprehensiveIncome
Callable Securities in Investment Portfolio 39,100,000indb_CallableSecuritiesInInvestmentPortfolio    
Pledged Financial Instruments, Not Separately Reported, Securities 327,400,000us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged   340,000,000us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged
Gain (Loss) on Sale of Equity Investments 0us-gaap_GainLossOnSaleOfEquityInvestments 91,000us-gaap_GainLossOnSaleOfEquityInvestments  
Trading Securities $ 494,000us-gaap_TradingSecurities