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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Accounting Policies [Line Items]    
Reserve for unfunded loan commitments 813,000us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend 716,000us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend
Maximum [Member]    
Accounting Policies [Line Items]    
Lease option period 15 years  
Loans Receivable [Member] | Lender Concentration Risk [Member] | Residential Building [Member]    
Accounting Policies [Line Items]    
Loans of nonresidential buildings to total loan portfolio 16.40%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_LoansReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LenderConcentrationRiskMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= indb_ResidentialBuildingMember		 16.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_LoansReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LenderConcentrationRiskMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= indb_ResidentialBuildingMember
Full Service Retail Branch [Member] | Bank [Member]    
Accounting Policies [Line Items]    
Number of branches 75indb_NumberOfBranches
/ dei_LegalEntityAxis
= indb_RocklandTrustCompanyMember
/ indb_TypeOfOperationAxis
= indb_FullServiceRetailBranchMember		  
Limited Service Retail Branch [Member] | Bank [Member]    
Accounting Policies [Line Items]    
Number of branches 3indb_NumberOfBranches
/ dei_LegalEntityAxis
= indb_RocklandTrustCompanyMember
/ indb_TypeOfOperationAxis
= indb_LimitedServiceRetailBranchMember		  
Commercial Banking Center [Member] | Bank [Member]    
Accounting Policies [Line Items]    
Number of centers 11indb_NumberOfCenters
/ dei_LegalEntityAxis
= indb_RocklandTrustCompanyMember
/ indb_TypeOfOperationAxis
= indb_CommercialBankingCenterMember		  
Investment Management Office [Member] | Bank [Member]    
Accounting Policies [Line Items]    
Number of offices 5indb_NumberOfOffices
/ dei_LegalEntityAxis
= indb_RocklandTrustCompanyMember
/ indb_TypeOfOperationAxis
= indb_InvestmentManagementOfficeMember		  
Mortgage Lending Center [Member] | Bank [Member]    
Accounting Policies [Line Items]    
Number of centers 3indb_NumberOfCenters
/ dei_LegalEntityAxis
= indb_RocklandTrustCompanyMember
/ indb_TypeOfOperationAxis
= indb_MortgageLendingCenterMember