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ACQUISITIONS (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Nov. 09, 2012
Assets          
Goodwill $ 170,421us-gaap_Goodwill $ 170,421us-gaap_Goodwill $ 150,391us-gaap_Goodwill $ 130,074us-gaap_Goodwill  
Central Bankcorp, Inc. [Member]          
Assets          
Cash         12,683indb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCash
/ us-gaap_BusinessAcquisitionAxis
= indb_CentralBankcorpIncMember
Investments         28,268indb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInvestments
/ us-gaap_BusinessAcquisitionAxis
= indb_CentralBankcorpIncMember
Loans         450,671indb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansNet
/ us-gaap_BusinessAcquisitionAxis
= indb_CentralBankcorpIncMember
Premises and equipment         6,277us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= indb_CentralBankcorpIncMember
Goodwill         22,544us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= indb_CentralBankcorpIncMember
Core deposit intangible         2,150us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= indb_CentralBankcorpIncMember
Other assets         37,309indb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= indb_CentralBankcorpIncMember
Total assets acquired         559,902us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialAssets
/ us-gaap_BusinessAcquisitionAxis
= indb_CentralBankcorpIncMember
Liabilities          
Deposits         357,434indb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeposits
/ us-gaap_BusinessAcquisitionAxis
= indb_CentralBankcorpIncMember
Borrowings         144,920indb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBorrowings
/ us-gaap_BusinessAcquisitionAxis
= indb_CentralBankcorpIncMember
Other liabilities         5,511indb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherLiabilities
/ us-gaap_BusinessAcquisitionAxis
= indb_CentralBankcorpIncMember
Total liabilities assumed         507,865us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialLiabilities
/ us-gaap_BusinessAcquisitionAxis
= indb_CentralBankcorpIncMember
Purchase price         $ 52,037us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= indb_CentralBankcorpIncMember