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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Textual) | 12 Months Ended
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Dec. 31, 2024
Maximum [Member] |
Accounting Policies [Line Items] |
Lease Option Period | 15 years

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- Definition [Line Items] for Accounting Policies [Table] + References No definition available. + Details
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Namespace Prefix: | indb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Lease Option Period + References No definition available. + Details
Name: | indb_LeaseOptionPeriod
Namespace Prefix: | indb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |