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ACQUISITIONS (Details 1) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Nov. 15, 2013
Nov. 09, 2012
Business Acquisition [Line Items]          
Contractually required principal and interest payments receivable       $ 4,440us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition $ 47,548us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition [1]
Certain Loans Acquired in Transfer, Nonaccretable Difference       (1,296)us-gaap_CertainLoansAcquiredInTransferNonaccretableDifference (8,733)us-gaap_CertainLoansAcquiredInTransferNonaccretableDifference
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition       3,144us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition 38,815us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition [1]
Interest component of expected cash flows (2,974)us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAccretableYield (2,514)us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAccretableYield (2,464)us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAccretableYield (386)us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAccretableYield (3,095)us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAccretableYield
Less: fair value (initial carrying amount)       2,758us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValue 35,720us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValue
Mayflower Bankcorp, Inc. [Member]          
Business Acquisition [Line Items]          
Contractually required principal and interest payments receivable       4,440us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition
/ us-gaap_BusinessAcquisitionAxis
= indb_MayflowerBankcorpInc.Member		  
Net interest income after provision for loan losses 178,556indb_BusinessAcquisitionProFormaInterestIncomeExpenseAfterProvisionForLoanLoss
/ us-gaap_BusinessAcquisitionAxis
= indb_MayflowerBankcorpInc.Member		 162,781indb_BusinessAcquisitionProFormaInterestIncomeExpenseAfterProvisionForLoanLoss
/ us-gaap_BusinessAcquisitionAxis
= indb_MayflowerBankcorpInc.Member		      
Net income 55,103us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= indb_MayflowerBankcorpInc.Member		 44,133us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= indb_MayflowerBankcorpInc.Member		      
Certain Loans Acquired in Transfer, Nonaccretable Difference       (1,296)us-gaap_CertainLoansAcquiredInTransferNonaccretableDifference
/ us-gaap_BusinessAcquisitionAxis
= indb_MayflowerBankcorpInc.Member		  
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition       3,144us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition
/ us-gaap_BusinessAcquisitionAxis
= indb_MayflowerBankcorpInc.Member		  
Interest component of expected cash flows       (386)us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAccretableYield
/ us-gaap_BusinessAcquisitionAxis
= indb_MayflowerBankcorpInc.Member		  
Less: fair value (initial carrying amount)       2,758us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValue
/ us-gaap_BusinessAcquisitionAxis
= indb_MayflowerBankcorpInc.Member		  
Central Bankcorp, Inc. [Member]          
Business Acquisition [Line Items]          
Contractually required principal and interest payments receivable         47,548us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition
/ us-gaap_BusinessAcquisitionAxis
= indb_CentralBankcorpIncMember
Net interest income after provision for loan losses   165,860indb_BusinessAcquisitionProFormaInterestIncomeExpenseAfterProvisionForLoanLoss
/ us-gaap_BusinessAcquisitionAxis
= indb_CentralBankcorpIncMember		 170,514indb_BusinessAcquisitionProFormaInterestIncomeExpenseAfterProvisionForLoanLoss
/ us-gaap_BusinessAcquisitionAxis
= indb_CentralBankcorpIncMember		    
Net income   47,261us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= indb_CentralBankcorpIncMember		 46,477us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= indb_CentralBankcorpIncMember		    
Certain Loans Acquired in Transfer, Nonaccretable Difference         (8,733)us-gaap_CertainLoansAcquiredInTransferNonaccretableDifference
/ us-gaap_BusinessAcquisitionAxis
= indb_CentralBankcorpIncMember
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition         38,815us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition
/ us-gaap_BusinessAcquisitionAxis
= indb_CentralBankcorpIncMember
Interest component of expected cash flows         (3,095)us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAccretableYield
/ us-gaap_BusinessAcquisitionAxis
= indb_CentralBankcorpIncMember
Less: fair value (initial carrying amount)         $ 35,720us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValue
/ us-gaap_BusinessAcquisitionAxis
= indb_CentralBankcorpIncMember
[1] Reflective of anticipated prepayments.