XML 60 R41.htm IDEA: XBRL DOCUMENT
v3.19.2

Acquisition Proforma Net Income (Details) - Blue Hills Bancorp, Inc. [Member] - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, Pro Forma Interest Income (Expense), after Provision for Loan Loss | $ 105,019 | $ 90,050 | $ 208,327 | $ 176,840
Business Acquisition, Pro Forma Net Income (Loss) | $ 30,628 | $ 37,575 | $ 30,062 | $ 71,713

X
- Definition Business Acquisition, Pro Forma Interest Income (Expense), after Provision for Loan Loss + References No definition available. + Details
Name: | indb_BusinessAcquisitionProFormaInterestIncomeExpenseAfterProvisionForLoanLoss
Namespace Prefix: | indb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
Name: | us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=indb_BlueHillsBancorpInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |