XML 33 R33.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2019
Accounting Policies [Abstract] |
Schedule of Finite-Lived Intangible Asses Useful Lives | The range of useful lives is as follows:
Core deposit intangibles | 10 years
Noncompete agreement | 1 year
Customer Lists | 12 years
Leases | 3-30 years
The determination of which intangible assets have finite lives is subjective, as is the determination of the amortization period for such intangible assets.

X
- Definition Schedule of Finite-Lived Intangible Assets Useful Lives [Table Text Block] + References No definition available. + Details
Name: | indb_ScheduleOfFiniteLivedIntangibleAssetsUsefulLivesTableTextBlock
Namespace Prefix: | indb_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration