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v3.21.1

Subsequent Events (Details) - Subsequent Event $ / shares in Units, $ in Thousands | Apr. 22, 2021 USD ($) $ / shares shares
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Subsequent Event [Line Items] |
Business Combination, Cost of Acquired Entity, Purchase Price | $ | $ 1,150,000
Business Combination, Increase in Acquirer Outstanding Shares | 14,200,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares of Company Stock Issued for Each Share of Acquiree Stock | 0.2750
Business Acquisition, Share Price | $ / shares | $ 79.57

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- Definition Business Acquisition, Equity Interest Issued or Issuable, Number of Shares of Company Stock Issued for Each Share of Acquiree Stock + References No definition available. + Details
Name: | indb_BusinessAcquisitionEquityInterestIssuedOrIssuableNumberOfSharesOfCompanyStockIssuedForEachShareOfAcquireeStock
Namespace Prefix: | indb_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition. + References No definition available. + Details
Name: | indb_BusinessCombinationCostofAcquiredEntityPurchasePrice
Namespace Prefix: | indb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Business Combination, Increase in Acquirer Outstanding Shares + References No definition available. + Details
Name: | indb_BusinessCombinationIncreaseInAcquirerOutstandingShares
Namespace Prefix: | indb_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionSharePrice
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |