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Loans, Allowance for Credit Losses and Credit Quality Troubled Debt Restructurings (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Tdrs Recorded Investment On Accrual Status | $ 18,129 | $ 19,599
Tdrs Recorded Investment On Nonaccrual Status | 23,842 | 24,766
Financing Receivable Recorded Investment Trouble Debt Restructuring | 41,971 | 44,365
Amount Of Specific Reserves Included In Allowance For Loan Losses Associated With Trouble Debt Restructuring |  | 855
Additional Commitments To Lend To Borrower For Trouble Debt Restructuring | $ 163 | $ 63

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- Definition Additional commitments to lend to a borrower for trouble debt restructuring. + References No definition available. + Details
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Namespace Prefix: | indb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of specific reserves included in the allowance for loan losses associated with trouble debt restructuring. + References No definition available. + Details
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- Definition Financing receivable recorded investment trouble debt restructuring. + References No definition available. + Details
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Namespace Prefix: | indb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Troubled Debt Restructurings recorded investment that are on accrual status as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | indb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Troubled Debt Restructurings recorded investment that are on nonaccrual status as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | indb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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