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Loans, Allowance for Loan Losses and Credit Quality (Internal Risk-Rating Categories for the Commercial Portfolio) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Internal risk-rating categories for the Company's commercial portfolio    
TOTAL $ 3,815,199indb_FinancingReceivableWithDeterioratedCreditQuality $ 3,559,403indb_FinancingReceivableWithDeterioratedCreditQuality
Commercial and Industrial [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
TOTAL 829,380indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_CommercialAndIndustrialMember		 860,839indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_CommercialAndIndustrialMember
Commercial Real Estate [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
TOTAL 2,606,444indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember		 2,347,323indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
Commercial Construction [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
TOTAL 291,666indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		 265,994indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
Small Business [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
TOTAL 87,709indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_SmallBusinessMember		 85,247indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_SmallBusinessMember
PASS [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
TOTAL 3,570,484indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 3,327,638indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
PASS [Member] | Commercial and Industrial [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
TOTAL 760,872indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_CommercialAndIndustrialMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 801,578indb_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 2,452,783indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 2,196,109indb_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 272,974indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 248,696indb_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 83,855indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_SmallBusinessMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 81,255indb_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 147,891indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_InternalCreditAssessmentAxis
= indb_PotentialWeaknessMember		 138,570indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_InternalCreditAssessmentAxis
= indb_PotentialWeaknessMember
POTENTIAL WEAKNESS [Member] | Commercial and Industrial [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
TOTAL 43,159indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_CommercialAndIndustrialMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_PotentialWeaknessMember		 37,802indb_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 83,746indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_PotentialWeaknessMember		 82,372indb_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 18,154indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_PotentialWeaknessMember		 15,464indb_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 2,832indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_SmallBusinessMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_PotentialWeaknessMember		 2,932indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_SmallBusinessMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_PotentialWeaknessMember
DEFINITE WEAKNESS-LOSS UNLIKELY [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
TOTAL 95,075indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_InternalCreditAssessmentAxis
= indb_DefiniteWeaknessLossUnlikelyMember		 90,595indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_InternalCreditAssessmentAxis
= indb_DefiniteWeaknessLossUnlikelyMember
DEFINITE WEAKNESS-LOSS UNLIKELY [Member] | Commercial and Industrial [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
TOTAL 24,950indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_CommercialAndIndustrialMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_DefiniteWeaknessLossUnlikelyMember		 20,241indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_CommercialAndIndustrialMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_DefiniteWeaknessLossUnlikelyMember
DEFINITE WEAKNESS-LOSS UNLIKELY [Member] | Commercial Real Estate [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
TOTAL 68,669indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_DefiniteWeaknessLossUnlikelyMember		 67,571indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_DefiniteWeaknessLossUnlikelyMember
DEFINITE WEAKNESS-LOSS UNLIKELY [Member] | Commercial Construction [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
TOTAL 538indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_DefiniteWeaknessLossUnlikelyMember		 1,834indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_DefiniteWeaknessLossUnlikelyMember
DEFINITE WEAKNESS-LOSS UNLIKELY [Member] | Small Business [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
TOTAL 918indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_SmallBusinessMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_DefiniteWeaknessLossUnlikelyMember		 949indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_SmallBusinessMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_DefiniteWeaknessLossUnlikelyMember
PARTIAL LOSS PROBABLE [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
TOTAL 1,749indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_InternalCreditAssessmentAxis
= indb_PartialLossProbableMember		 2,600indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_InternalCreditAssessmentAxis
= indb_PartialLossProbableMember
PARTIAL LOSS PROBABLE [Member] | Commercial and Industrial [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
TOTAL 399indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_CommercialAndIndustrialMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_PartialLossProbableMember		 1,218indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_CommercialAndIndustrialMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_PartialLossProbableMember
PARTIAL LOSS PROBABLE [Member] | Commercial Real Estate [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
TOTAL 1,246indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_PartialLossProbableMember		 1,271indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_PartialLossProbableMember
PARTIAL LOSS PROBABLE [Member] | Small Business [Member]    
Internal risk-rating categories for the Company's commercial portfolio    
TOTAL 104indb_FinancingReceivableWithDeterioratedCreditQuality
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= indb_SmallBusinessMember
/ us-gaap_InternalCreditAssessmentAxis
= indb_PartialLossProbableMember		 111indb_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