XML 94 R76.htm IDEA: XBRL DOCUMENT
v3.5.0.2

Commitments and contingencies Textual (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Dec. 31, 2015
Other Commitments [Line Items] |  |  |  |
Operating Leases, Rent Expense | $ 2.1 | $ 2.0 | $ 4.3 | $ 3.9
Cash Reserve Deposit Required and Made | $ 27.2 |  | $ 27.2 | $ 21.7
Minimum [Member] |  |  |  |
Other Commitments [Line Items] |  |  |  |
Operating Leases, Lease Renewal Period Option |  |  | 1 year |
Maximum [Member] |  |  |  |
Other Commitments [Line Items] |  |  |  |
Operating Leases, Lease Renewal Period Option |  |  | 10 years |

X
- Definition Operating Leases, Lease Renewal Period Option + References No definition available. + Details
Name: | indb_OperatingLeasesLeaseRenewalPeriodOption
Namespace Prefix: | indb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Cash deposited in a special reserve account for the exclusive benefit of customers pursuant to SEC Regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 305 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6478312&loc=d3e61473-112792 + Details
Name: | us-gaap_CashReserveDepositRequiredAndMade
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_OtherCommitmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |