XML 50 R71.htm IDEA: XBRL DOCUMENT
v3.19.3

Derivatives and Hedging Activities (Customer Related Derivative Positions - Not Designated as Hedges) (Details) - Not Designated as Hedging Instrument $ in Thousands | Sep. 30, 2019 USD ($) position | Dec. 31, 2018 USD ($) position
--- | --- | ---
Receive fixed, pay variable | Loan level swaps |  |  |
Summary of customer related derivative positions, not designated as hedging |  |  |
Number of Positions | position | [1] | 305 | 235
Less than 1 year |  | $ 74,074 | $ 50,702
Less than 2 years |  | 225,274 | 124,222
Less than 3 years |  | 43,837 | 97,904
Less than 4 years |  | 200,589 | 47,308
Thereafter |  | 1,064,509 | 631,471
Derivative, Notional Amount |  | 1,608,283 | 951,607
Fair Value |  | $ 71,302 | $ (2,907)
Pay fixed, receive variable | Loan level swaps |  |  |
Summary of customer related derivative positions, not designated as hedging |  |  |
Number of Positions | position | [1] | 296 | 220
Less than 1 year |  | $ 74,074 | $ 50,702
Less than 2 years |  | 225,274 | 124,222
Less than 3 years |  | 43,837 | 97,904
Less than 4 years |  | 200,589 | 47,308
Thereafter |  | 1,064,509 | 631,471
Derivative, Notional Amount |  | 1,608,283 | 951,607
Fair Value |  | $ (71,292) | $ 2,903
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] | 41 | 27
Less than 1 year |  | $ 82,118 | $ 60,297
Less than 2 years |  |  | 3,505
Derivative, Notional Amount |  | 82,118 | 63,802
Fair Value |  | $ (3,305) | $ (1,404)
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] | 41 | 27
Less than 1 year |  | $ 82,118 | $ 60,297
Less than 2 years |  |  | 3,505
Derivative, Notional Amount |  | 82,118 | 63,802
Fair Value |  | $ 3,345 | $ 1,434
[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 -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 + 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: |