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LOANS, ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY Foreclosed Residential Real Estate Property (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Foreclosed Residential Real Estate Property [Line Items] |  |
Foreclosed residential real estate property held by the creditor | $ 0 | $ 0
Mortgage Loans in Process of Foreclosure, Amount | $ 1,426 | $ 1,750

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- Definition [Line Items] for Foreclosed Residential Real Estate Property [Table] + References No definition available. + Details
Name: | indb_ForeclosedResidentialRealEstatePropertyLineItems
Namespace Prefix: | indb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Foreclosed residential real estate property held by the creditor + References No definition available. + Details
Name: | indb_Foreclosedresidentialrealestatepropertyheldbythecreditor
Namespace Prefix: | indb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL49126937-111524 + Details
Name: | us-gaap_MortgageLoansInProcessOfForeclosureAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant