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STOCK BASED COMPENSATION (Details Textual) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2012
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 254,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber   268,290us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Share Based Compensation Arrangement By Share Based Payment Award Options Price Per Share Common Stock Average High And Low Price Intrinsic Value 43.11indb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsPricePerShareCommonStockAverageHighAndLowPriceIntrinsicValue    
Stock options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options outstanding and expected to vest at December 31, 2014 330,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
[1]    
Annualized estimated forfeitures 3.50%indb_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAnnualizedEstimatedForfeitures
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Options exercisable at December 31, 2014 329,085us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
[2]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares 1,666us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
[3]   33,487us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 276,527us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
[4]   271,927us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Director [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options outstanding and expected to vest at December 31, 2014 28,999us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
   
Options exercisable at December 31, 2014 27,334us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
   
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares 1,666us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
   
Director [Member] | Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 34,600us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
   
Two Thousand Five Amended and Restated Employee Stock Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 1,650,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= indb_TwoThousandFiveAmendedAndRestatedEmployeeStockPlanMember
[5]    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 561,016us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= indb_TwoThousandFiveAmendedAndRestatedEmployeeStockPlanMember
   
Two Thousand Five Amended and Restated Employee Stock Plan [Member] | Stock Options or Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 1,650,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= indb_StockOptionsOrRestrictedStockMember
/ us-gaap_PlanNameAxis
= indb_TwoThousandFiveAmendedAndRestatedEmployeeStockPlanMember
   
Two Thousand Six Nonemployee Director Stock Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 35,400us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= indb_TwoThousandSixNonemployeeDirectorStockPlanMember
[6]    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Transferred From (To) Another Plan   (14,600)indb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedTransferredFromToAnotherPlan
/ us-gaap_PlanNameAxis
= indb_TwoThousandSixNonemployeeDirectorStockPlanMember
 
Two Thousand Six Nonemployee Director Stock Plan [Member] | Stock Options or Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 50,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= indb_StockOptionsOrRestrictedStockMember
/ us-gaap_PlanNameAxis
= indb_TwoThousandSixNonemployeeDirectorStockPlanMember
   
Nineteen Ninety-Six Nonemployee Directors' Stock Option Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= indb_NineteenNinetySixNonemployeeDirectorsStockOptionPlanMember
   
Nineteen Ninety-Six Nonemployee Directors' Stock Option Plan [Member] | Stock options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= indb_NineteenNinetySixNonemployeeDirectorsStockOptionPlanMember
   
Two Thousand Ten Nonemployee Director Stock Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 314,600us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= indb_TwoThousandTenNonemployeeDirectorStockPlanMember
[7]    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 220,380us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= indb_TwoThousandTenNonemployeeDirectorStockPlanMember
   
Two Thousand Ten Nonemployee Director Stock Plan [Member] | Stock Options or Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 314,600us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= indb_StockOptionsOrRestrictedStockMember
/ us-gaap_PlanNameAxis
= indb_TwoThousandTenNonemployeeDirectorStockPlanMember
   
Two Thousand Ten Nonemployee Director Stock Plan [Member] | Maximum [Member] | Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years    
[1] Inclusive of 28,999 stock options outstanding and expected to vest to Directors.
[2] Inclusive of 27,334 vested stock options outstanding to Directors.
[3] Inclusive of 1,666 nonvested stock options outstanding to Directors.
[4] Inclusive of 34,600 restricted stock awards outstanding to Directors.
[5] The Company may award up to a total of 1,650,000 shares as stock options or restricted stock awards.
[6] The Company may award up to a total of 50,000 shares as stock options or restricted stock awards. During 2010, the remaining 14,600 shares were transferred and available for issue under the 2010 Plan.
[7] The Company may award up to a total of 314,600 shares as stock options or restricted stock awards, inclusive of 14,600 shares which were transferred from the 2006 Plan.