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STOCK OPTION AWARDS DURING PERIOD (Details 3) (Stock options [Member], USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares granted 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross    
Weighted average grant date fair value of options granted (per share) $ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 8.13us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
11/9/2013 | 2010 Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares granted 5,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardDateAxis
= indb_OptionsGrantedDateOneMember
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= indb_TwoThousandTenNonemployeeDirectorStockPlanMember
   
Vesting period 13 months [1]    
Expected volatility 31.23%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardDateAxis
= indb_OptionsGrantedDateOneMember
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= indb_TwoThousandTenNonemployeeDirectorStockPlanMember
   
Expected life (years) 5 years 6 months    
Expected dividend yield 2.64%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardDateAxis
= indb_OptionsGrantedDateOneMember
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= indb_TwoThousandTenNonemployeeDirectorStockPlanMember
   
Risk free interest rate 1.56%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardDateAxis
= indb_OptionsGrantedDateOneMember
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= indb_TwoThousandTenNonemployeeDirectorStockPlanMember
   
Weighted average grant date fair value of options granted (per share) $ 8.13us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardDateAxis
= indb_OptionsGrantedDateOneMember
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= indb_TwoThousandTenNonemployeeDirectorStockPlanMember
   
[1] Vesting periods begin on the grant date unless otherwise noted.