XML 87 R62.htm IDEA: XBRL DOCUMENT
v3.19.3

Loans, Allowance for Loan Losses and Credit Quality (Textual) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ 0 | $ 0 | $ 0 | $ 0 |
Unamortized Loan Commitment and Origination fees | 7,200,000 |  | 7,200,000 |  | $ 7,100,000
Significant Advanced Considered For Risk Rating Change | $ 50,000 |  |  |  |
Days to be termed as non accrual loans | 90 days |  |  |  |
Tdrs Recorded Investment On Nonaccrual Status | $ 26,232,000 |  | 26,232,000 |  | 29,348,000
Unamortized Discounts or Premiums | $ 24,700,000 |  | $ 24,700,000 |  | $ 15,200,000

X
- Definition Days to be termed as non accrual loans. + References No definition available. + Details
Name: | indb_DaysToBeTermedAsNonAccrualLoans
Namespace Prefix: | indb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Significant Advanced Considered For Risk Rating Change + References No definition available. + Details
Name: | indb_SignificantAdvancedConsideredForRiskRatingChange
Namespace Prefix: | indb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Troubled Debt Restructurings recorded investment that are on nonaccrual status as of the balance sheet date. + References No definition available. + Details
Name: | indb_TdrsRecordedInvestmentOnNonaccrualStatus
Namespace Prefix: | indb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. + References No definition available. + Details
Name: | indb_UnamortizedDiscountsorPremiums
Namespace Prefix: | indb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees + References No definition available. + Details
Name: | indb_UnamortizedLoanCommitmentandOriginationfees
Namespace Prefix: | indb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953682-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration