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Internal Risk Rating Categories for Commercial Portfolio (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Internal risk-rating categories for the Company's commercial portfolio    
Total $ 3,559,403indb_FinancingReceivableWithDeterioratedCreditQuality $ 3,334,561indb_FinancingReceivableWithDeterioratedCreditQuality
Commercial and Industrial [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
Total 860,839indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_CommercialAndIndustrialMember		 784,202indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_CommercialAndIndustrialMember
Commercial Real Estate [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
Total 2,347,323indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember		 2,249,260indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
Commercial Construction [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
Total 265,994indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		 223,859indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
Small Business [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
Total 85,247indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_SmallBusinessMember		 77,240indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_SmallBusinessMember
Pass [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
Total 3,327,638indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 3,087,877indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass [Member] | Commercial and Industrial [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
Total 801,578indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_CommercialAndIndustrialMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 736,996indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_CommercialAndIndustrialMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass [Member] | Commercial Real Estate [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
Total 2,196,109indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 2,068,995indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass [Member] | Commercial Construction [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
Total 248,696indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 210,372indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass [Member] | Small Business [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
Total 81,255indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_SmallBusinessMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 71,514indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_SmallBusinessMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Potential weakness [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
Total 138,570indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_InternalCreditAssessmentAxis
= indb_PotentialWeaknessMember		 125,464indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_InternalCreditAssessmentAxis
= indb_PotentialWeaknessMember
Potential weakness [Member] | Commercial and Industrial [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
Total 37,802indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_CommercialAndIndustrialMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_PotentialWeaknessMember		 21,841indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_CommercialAndIndustrialMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_PotentialWeaknessMember
Potential weakness [Member] | Commercial Real Estate [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
Total 82,372indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_PotentialWeaknessMember		 91,984indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_PotentialWeaknessMember
Potential weakness [Member] | Commercial Construction [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
Total 15,464indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_PotentialWeaknessMember		 8,608indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_PotentialWeaknessMember
Potential weakness [Member] | Small Business [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
Total 2,932indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_SmallBusinessMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_PotentialWeaknessMember		 3,031indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_SmallBusinessMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_PotentialWeaknessMember
Definite weakness [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
Total 90,595indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_InternalCreditAssessmentAxis
= indb_DefiniteWeaknessLossUnlikelyMember		 117,507indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_InternalCreditAssessmentAxis
= indb_DefiniteWeaknessLossUnlikelyMember
Definite weakness [Member] | Commercial and Industrial [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
Total 20,241indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_CommercialAndIndustrialMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_DefiniteWeaknessLossUnlikelyMember		 24,409indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_CommercialAndIndustrialMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_DefiniteWeaknessLossUnlikelyMember
Definite weakness [Member] | Commercial Real Estate [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
Total 67,571indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_DefiniteWeaknessLossUnlikelyMember		 85,767indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_DefiniteWeaknessLossUnlikelyMember
Definite weakness [Member] | Commercial Construction [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
Total 1,834indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_DefiniteWeaknessLossUnlikelyMember		 4,779indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_DefiniteWeaknessLossUnlikelyMember
Definite weakness [Member] | Small Business [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
Total 949indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_SmallBusinessMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_DefiniteWeaknessLossUnlikelyMember		 2,552indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_SmallBusinessMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_DefiniteWeaknessLossUnlikelyMember
Parital loss probable [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
Total 2,600indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_InternalCreditAssessmentAxis
= indb_PartialLossProbableMember		 3,713indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_InternalCreditAssessmentAxis
= indb_PartialLossProbableMember
Parital loss probable [Member] | Commercial and Industrial [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
Total 1,218indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_CommercialAndIndustrialMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_PartialLossProbableMember		 956indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_CommercialAndIndustrialMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_PartialLossProbableMember
Parital loss probable [Member] | Commercial Real Estate [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
Total 1,271indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_PartialLossProbableMember		 2,514indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_PartialLossProbableMember
Parital loss probable [Member] | Commercial Construction [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
Total   100indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_PartialLossProbableMember
Parital loss probable [Member] | Small Business [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
Total 111indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_SmallBusinessMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_PartialLossProbableMember		 143indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_SmallBusinessMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_PartialLossProbableMember
Definite loss [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
Total 0indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_InternalCreditAssessmentAxis
= indb_DefiniteLossMember		 0indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_InternalCreditAssessmentAxis
= indb_DefiniteLossMember
Definite loss [Member] | Commercial and Industrial [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
Total 0indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_CommercialAndIndustrialMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_DefiniteLossMember		 0indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_CommercialAndIndustrialMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_DefiniteLossMember
Definite loss [Member] | Commercial Real Estate [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
Total 0indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_DefiniteLossMember		 0indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_DefiniteLossMember
Definite loss [Member] | Commercial Construction [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
Total 0indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_DefiniteLossMember		 0indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_DefiniteLossMember
Definite loss [Member] | Small Business [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
Total $ 0indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_SmallBusinessMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_DefiniteLossMember		 $ 0indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_SmallBusinessMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_DefiniteLossMember