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CUMULATIVELY GRANTED AWARDS (Details)
Dec. 31, 2014
1996 Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Authorized Stock Awards 300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= indb_NineteenNinetySixNonemployeeDirectorsStockOptionPlanMember
Cumulative Granted, Net of Forfeitures 190,000indb_ShareBasedCompensationArrangementByShareBasedPaymentAwardCumulativeGrantedNetOfForfeitures
/ us-gaap_PlanNameAxis
= indb_NineteenNinetySixNonemployeeDirectorsStockOptionPlanMember
1996 Plan [Member] | Stock options [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Authorized Stock Awards 300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= indb_NineteenNinetySixNonemployeeDirectorsStockOptionPlanMember
Cumulative Granted, Net of Forfeitures 190,000indb_ShareBasedCompensationArrangementByShareBasedPaymentAwardCumulativeGrantedNetOfForfeitures
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= indb_NineteenNinetySixNonemployeeDirectorsStockOptionPlanMember
1997 Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Authorized Stock Awards 1,100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= indb_NineteenNinetySevenEmployeeStockOptionPlanMember
Cumulative Granted, Net of Forfeitures 972,271indb_ShareBasedCompensationArrangementByShareBasedPaymentAwardCumulativeGrantedNetOfForfeitures
/ us-gaap_PlanNameAxis
= indb_NineteenNinetySevenEmployeeStockOptionPlanMember
1997 Plan [Member] | Stock options [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Authorized Stock Awards 1,100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= indb_NineteenNinetySevenEmployeeStockOptionPlanMember
Cumulative Granted, Net of Forfeitures 972,271indb_ShareBasedCompensationArrangementByShareBasedPaymentAwardCumulativeGrantedNetOfForfeitures
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= indb_NineteenNinetySevenEmployeeStockOptionPlanMember
2005 Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Authorized Stock Awards 1,650,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= indb_TwoThousandFiveAmendedAndRestatedEmployeeStockPlanMember
[1]
Cumulative Granted, Net of Forfeitures 1,088,984indb_ShareBasedCompensationArrangementByShareBasedPaymentAwardCumulativeGrantedNetOfForfeitures
/ us-gaap_PlanNameAxis
= indb_TwoThousandFiveAmendedAndRestatedEmployeeStockPlanMember
Authorized but Unissued 561,016us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= indb_TwoThousandFiveAmendedAndRestatedEmployeeStockPlanMember
2005 Plan [Member] | Stock options [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Cumulative Granted, Net of Forfeitures 537,941indb_ShareBasedCompensationArrangementByShareBasedPaymentAwardCumulativeGrantedNetOfForfeitures
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= indb_TwoThousandFiveAmendedAndRestatedEmployeeStockPlanMember
2005 Plan [Member] | Restricted stock awards [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Cumulative Granted, Net of Forfeitures 551,043indb_ShareBasedCompensationArrangementByShareBasedPaymentAwardCumulativeGrantedNetOfForfeitures
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= indb_TwoThousandFiveAmendedAndRestatedEmployeeStockPlanMember
2006 Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Authorized Stock Awards 35,400us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= indb_TwoThousandSixNonemployeeDirectorStockPlanMember
[2]
Cumulative Granted, Net of Forfeitures 35,400indb_ShareBasedCompensationArrangementByShareBasedPaymentAwardCumulativeGrantedNetOfForfeitures
/ us-gaap_PlanNameAxis
= indb_TwoThousandSixNonemployeeDirectorStockPlanMember
2006 Plan [Member] | Stock options [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Cumulative Granted, Net of Forfeitures 15,000indb_ShareBasedCompensationArrangementByShareBasedPaymentAwardCumulativeGrantedNetOfForfeitures
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= indb_TwoThousandSixNonemployeeDirectorStockPlanMember
2006 Plan [Member] | Restricted stock awards [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Cumulative Granted, Net of Forfeitures 20,400indb_ShareBasedCompensationArrangementByShareBasedPaymentAwardCumulativeGrantedNetOfForfeitures
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= indb_TwoThousandSixNonemployeeDirectorStockPlanMember
2010 Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Authorized Stock Awards 314,600us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= indb_TwoThousandTenNonemployeeDirectorStockPlanMember
[3]
Cumulative Granted, Net of Forfeitures 94,220indb_ShareBasedCompensationArrangementByShareBasedPaymentAwardCumulativeGrantedNetOfForfeitures
/ us-gaap_PlanNameAxis
= indb_TwoThousandTenNonemployeeDirectorStockPlanMember
Authorized but Unissued 220,380us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= indb_TwoThousandTenNonemployeeDirectorStockPlanMember
2010 Plan [Member] | Stock options [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Cumulative Granted, Net of Forfeitures 27,000indb_ShareBasedCompensationArrangementByShareBasedPaymentAwardCumulativeGrantedNetOfForfeitures
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= indb_TwoThousandTenNonemployeeDirectorStockPlanMember
2010 Plan [Member] | Restricted stock awards [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Cumulative Granted, Net of Forfeitures 67,220indb_ShareBasedCompensationArrangementByShareBasedPaymentAwardCumulativeGrantedNetOfForfeitures
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= indb_TwoThousandTenNonemployeeDirectorStockPlanMember
[1] The Company may award up to a total of 1,650,000 shares as stock options or restricted stock awards.
[2] The Company may award up to a total of 50,000 shares as stock options or restricted stock awards. During 2010, the remaining 14,600 shares were transferred and available for issue under the 2010 Plan.
[3] The Company may award up to a total of 314,600 shares as stock options or restricted stock awards, inclusive of 14,600 shares which were transferred from the 2006 Plan.