XML 72 R53.htm IDEA: XBRL DOCUMENT
v3.23.3

Derivatives and Hedging Activities (Customer Related Derivative Positions - Not Designated as Hedges) (Details) - Not Designated as Hedging Instrument $ in Thousands | Sep. 30, 2023 USD ($) position | Dec. 31, 2022 USD ($) position
--- | --- | ---
Receive fixed, pay variable | Loan level swaps |  |  |
Summary of customer related derivative positions, not designated as hedging |  |  |
Number of Positions | position | [1] | 283 | 283
Less than 1 year |  | $ 67,347 | $ 80,531
Less than 2 years |  | 248,602 | 96,613
Less than 3 years |  | 204,413 | 256,924
Less than 4 years |  | 247,437 | 193,096
Thereafter |  | 987,554 | 1,016,312
Derivative, Notional Amount |  | 1,755,353 | 1,643,476
Fair Value |  | $ (146,746) | $ (118,930)
Pay fixed, receive variable | Loan level swaps |  |  |
Summary of customer related derivative positions, not designated as hedging |  |  |
Number of Positions | position | [1] | 283 | 283
Less than 1 year |  | $ 67,347 | $ 80,531
Less than 2 years |  | 248,602 | 96,613
Less than 3 years |  | 204,413 | 256,924
Less than 4 years |  | 247,437 | 193,096
Thereafter |  | 987,554 | 1,016,312
Derivative, Notional Amount |  | 1,755,353 | 1,643,476
Fair Value |  | $ 146,649 | $ 118,928
Buys foreign currency, sells U.S. currency | Foreign exchange contracts |  |  |
Summary of customer related derivative positions, not designated as hedging |  |  |
Number of Positions | position | [1] | 22 | 49
Less than 1 year |  | $ 54,498 | $ 124,982
Less than 2 years |  | 16,089 | 13,363
Less than 3 years |  | 0 | 0
Less than 4 years |  | 0 | 0
Thereafter |  | 0 | 0
Derivative, Notional Amount |  | 70,587 | 138,345
Fair Value |  | $ (335) | $ 306
Buys U.S. currency, sells foreign currency | Foreign exchange contracts |  |  |
Summary of customer related derivative positions, not designated as hedging |  |  |
Number of Positions | position | [1] | 22 | 49
Less than 1 year |  | $ 54,498 | $ 124,982
Less than 2 years |  | 16,089 | 13,363
Less than 3 years |  | 0 | 0
Less than 4 years |  | 0 | 0
Thereafter |  | 0 | 0
Derivative, Notional Amount |  | 70,587 | 138,345
Fair Value |  | $ 366 | $ (232)
Risk Participated Out | Risk Participation Agreement |  |  |
Summary of customer related derivative positions, not designated as hedging |  |  |
Number of Positions | position |  | 17 | 13
Less than 1 year |  | $ 0 | $ 2,595
Less than 2 years |  | 24,322 | 0
Less than 3 years |  | 0 | 24,538
Less than 4 years |  | 3,666 | 0
Thereafter |  | 123,961 | 95,514
Derivative, Notional Amount |  | 151,949 | 122,647
Fair Value |  | $ 102 | $ 161
Risk Participated In | Risk Participation Agreement |  |  |
Summary of customer related derivative positions, not designated as hedging |  |  |
Number of Positions | position |  | 7 | 6
Less than 1 year |  | $ 10,586 | $ 27,365
Less than 2 years |  |  | 0
Less than 3 years |  | 0 | 0
Less than 4 years |  | 19,078 | 0
Thereafter |  | 8,097 | 25,849
Derivative, Notional Amount |  | 37,761 | 53,214
Fair Value |  | $ (4) | $ (15)
[1] | The Company may enter into one dealer swap agreement which offsets multiple commercial borrower swap agreements.

X
- Definition Notional amount maturing in next twelve months. + References No definition available. + Details
Name: | indb_NotionalAmountMaturingInNextTwelveMonths
Namespace Prefix: | indb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Notional amount maturing in year five and thereafter. + References No definition available. + Details
Name: | indb_NotionalAmountMaturingInYearFiveAndThereafter
Namespace Prefix: | indb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Notional amount maturing in year four. + References No definition available. + Details
Name: | indb_NotionalAmountMaturingInYearFour
Namespace Prefix: | indb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Notional amount maturing in year three. + References No definition available. + Details
Name: | indb_NotionalAmountMaturingInYearThree
Namespace Prefix: | indb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Notional amount maturing in year two. + References No definition available. + Details
Name: | indb_NotionalAmountMaturingInYearTwo
Namespace Prefix: | indb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Notional and fair value amount of other derivatives not designated as hedging instruments. + References No definition available. + Details
Name: | indb_NotionalAndFairValueAmountOfOtherDerivativesNotDesignatedAsHedgingInstrumentsAbstract
Namespace Prefix: | indb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-10 + Details
Name: | us-gaap_DerivativeFairValueOfDerivativeNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-1B Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-1A + Details
Name: | us-gaap_DerivativeNotionalAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of derivative instruments of a particular group held by the entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480524/946-210-50-6 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 55 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480493/946-210-55-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 5 -Subparagraph (SX 210.12-13(Column A)(Footnote 3)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-5 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 5 -Subparagraph (SX 210.12-13(Column C)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-5 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 5A -Subparagraph (SX 210.12-13A(Column B)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-5A Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-1B Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-1A + Details
Name: | us-gaap_DerivativeNumberOfInstrumentsHeld
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TradingActivityByTypeAxis=indb_ReceiveFixedPayVariableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=indb_LoanLevelSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TradingActivityByTypeAxis=indb_PayFixedReceiveVariableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TradingActivityByTypeAxis=indb_BuysForeignExchangeSellsUsCurrencyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TradingActivityByTypeAxis=indb_BuysUsCurrencySellsForeignExchangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TradingActivityByTypeAxis=indb_RiskParticipatedOutMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=indb_RiskParticipationAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TradingActivityByTypeAxis=indb_RiskParticipatedInMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |