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BORROWINGS (Trust Preferred Securities) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Aug. 31, 2013
Debt Instrument [Line Items]      
Face Amount 71.0us-gaap_DebtInstrumentFaceAmount $ 71.0us-gaap_DebtInstrumentFaceAmount  
Junior Subordinated Debentures [Member] | Capital Trust V Preferred Securities Due in 2037 [Member]      
Debt Instrument [Line Items]      
Face Amount 50.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= indb_CapitalTrustVPreferredSecuritiesDueIn2037Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember		    
Fixed rate 6.52%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= indb_CapitalTrustVPreferredSecuritiesDueIn2037Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember		    
Junior Subordinated Debentures [Member] | Capital Trust V Preferred Securities Due in 2037 [Member] | LIBOR [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.48%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= indb_CapitalTrustVPreferredSecuritiesDueIn2037Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		    
Junior Subordinated Debentures [Member] | Slades Ferry Trust I Preferred Securities Due in 2034 [Member]      
Debt Instrument [Line Items]      
Face Amount 10.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= indb_SladesFerryTrustIPreferredSecuritiesDueIn2034Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember		    
Junior Subordinated Debentures [Member] | Slades Ferry Trust I Preferred Securities Due in 2034 [Member] | LIBOR [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 2.79%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= indb_SladesFerryTrustIPreferredSecuritiesDueIn2034Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		    
Junior Subordinated Debentures [Member] | Central Bancorp Capital Trust I Securities Due in 2034 [Member]      
Debt Instrument [Line Items]      
Face Amount 5.1us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= indb_CentralBancorpCapitalTrustISecuritiesDueIn2034Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember		    
Junior Subordinated Debentures [Member] | Central Bancorp Capital Trust I Securities Due in 2034 [Member] | LIBOR [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 2.44%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= indb_CentralBancorpCapitalTrustISecuritiesDueIn2034Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		    
Junior Subordinated Debentures [Member] | Central Bancorp Capital Trust II Securities Due in 2037 [Member]      
Debt Instrument [Line Items]      
Face Amount 5.9us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= indb_CentralBancorpCapitalTrustIiSecuritiesDueIn2037Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember		    
Fixed rate 7.015%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= indb_CentralBancorpCapitalTrustIiSecuritiesDueIn2037Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember		    
Junior Subordinated Debentures [Member] | Central Bancorp Capital Trust II Securities Due in 2037 [Member] | LIBOR [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.65%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= indb_CentralBancorpCapitalTrustIiSecuritiesDueIn2037Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		    
Subordinated Debt [Member] | LIBOR [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 3.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		    
Subordinated Debt [Member] | Subordinated Debentures Due in October 2019 [Member]      
Debt Instrument [Line Items]      
Fixed rate     7.02%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= indb_SubordinatedDebenturesDueinOctober2019Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember
Subordinated Debt [Member] | Subordinated Debentures Due in October 2019 [Member] | LIBOR [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 3.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= indb_SubordinatedDebenturesDueinOctober2019Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		    
Subordinated Debt [Member] | Subordinated Debentures Due in November 2019 [Member] [Domain] | LIBOR [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 2.98%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= indb_SubordinatedDebenturesDueinNovember2019MemberDomain
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember