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Fair Value Measurements (Details 1) (Pooled trust preferred securities, Significant Unobservable Inputs (Level 3), USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Pooled trust preferred securities | Significant Unobservable Inputs (Level 3)
   
Reconciliation for all assets and liabilities measured at fair value on a recurring basis    
Beginning Balance $ 6,321us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= indb_PooledTrustPreferredSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
$ 3,841us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= indb_PooledTrustPreferredSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Included in Other Comprehensive Income (4)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= indb_PooledTrustPreferredSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
1,162us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= indb_PooledTrustPreferredSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
SETTLEMENTS (45)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= indb_PooledTrustPreferredSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
(36)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= indb_PooledTrustPreferredSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Ending Balance $ 6,272us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= indb_PooledTrustPreferredSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
$ 4,967us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= indb_PooledTrustPreferredSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member