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Loans, Allowance for Loan Losses and Credit Quality Foreclosed Residential Real Estate Property (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Foreclosed Residential Real Estate Property [Abstract] |  |
Foreclosed residential real estate property held by the creditor | $ 0 | $ 0
Recorded investment in mortgage loans collateralized by residential real estate property that are in the process of foreclosure | $ 4,580 | $ 3,294

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- Definition Foreclosed Residential Real Estate Property [Abstract] + References No definition available. + Details
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Namespace Prefix: | indb_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Foreclosed residential real estate property held by the creditor + References No definition available. + Details
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Namespace Prefix: | indb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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=118936363&loc=SL49126937-111524 + Details
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