XML 67 R48.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Loans, Allowance for Loan Losses and Credit Quality (Modifications which occurred during the period & change in recorded investment) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) contract | Sep. 30, 2017 USD ($) contract | Sep. 30, 2018 USD ($) contract | Sep. 30, 2017 USD ($) contract
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | contract | 8 | 7 |  | 16 | 44
TROUBLED DEBT RESTRUCTURINGS: |  |  |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | $ 908 | $ 815 |  | $ 1,974 | $ 6,222
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 928 | $ 815 | [1] | $ 1,994 | $ 6,236
Commercial and Industrial [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | contract | 2 | 1 |  | 2 | 9
TROUBLED DEBT RESTRUCTURINGS: |  |  |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | $ 126 | $ 196 |  | $ 126 | $ 1,575
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 126 | $ 196 | [1] | $ 126 | $ 1,575
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | contract | 1 | 0 |  | 2 | 6
TROUBLED DEBT RESTRUCTURINGS: |  |  |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | $ 205 | $ 0 |  | $ 650 | $ 1,884
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 205 | $ 0 | [1] | $ 650 | $ 1,884
Small Business [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | contract |  | 2 |  |  | 10
TROUBLED DEBT RESTRUCTURINGS: |  |  |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment |  | $ 183 |  |  | $ 447
Financing Receivable, Modifications, Post-Modification Recorded Investment |  | $ 183 | [1] |  | $ 447
Residential Real Estate [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | contract | 3 | 0 |  | 4 | 5
TROUBLED DEBT RESTRUCTURINGS: |  |  |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | $ 503 | $ 0 |  | $ 652 | $ 889
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 523 | $ 0 |  | $ 672 | $ 900
Consumer Home Equity [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | contract | 2 | 4 |  | 8 | 14
TROUBLED DEBT RESTRUCTURINGS: |  |  |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | $ 74 | $ 436 |  | $ 546 | $ 1,427
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 74 | $ 436 | [1] | $ 546 | $ 1,430
[1] | The post-modification balances represent the legal principal balance of the loan on the date of modification. These amounts may show an increase when modifications include a capitalization of interest.

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

X
- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Pre-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=indb_CommercialAndIndustrialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=indb_SmallBusinessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ResidentialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HomeEquityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |