XML 78 R57.htm IDEA: XBRL DOCUMENT
v3.6.0.2

ACQUISITIONS (Details 2) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Peoples Federal Bancshares, Inc [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Net interest income after provision for loan losses |  | $ 216,086 | $ 203,296
Net income |  | 69,816 | $ 60,896
New England Bancorp, Inc. [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Net interest income after provision for loan losses | $ 228,927 | 221,252 |
Net income | $ 80,411 | $ 65,623 |

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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=65885119&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_PeoplesFederalBancsharesIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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