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Loans, Allowance for Credit Losses and Credit Quality - Foreclosed Residential Real Estate Property (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
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Receivables [Abstract] |  |
Foreclosed residential real estate property held by the creditor | $ 110 | $ 0
Mortgage Loans in Process of Foreclosure, Amount | $ 2,425 | $ 1,615

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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 -Name Accounting Standards Codification -Section 50 -Paragraph 35 -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-35 + Details
Name: | us-gaap_MortgageLoansInProcessOfForeclosureAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration