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Loans, Allowance for Credit Losses and Credit Quality - Troubled Debt Restructuring (Details) | Dec. 31, 2022 USD ($)
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Receivables [Abstract] |
TDRs on accrual status | $ 11,278,000
TDRs on nonaccrual | 11,520,000
Total TDRs | $ 22,798,000

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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
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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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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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