XML 81 R63.htm IDEA: XBRL DOCUMENT
v3.5.0.2

Derivatives and Hedging Activities (Derivative Positions for Interest Rate Swaps which Qualify as Hedges) (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes |  |  |  |  |  |
Notional Amount |  | $ 125,000,000 |  | $ 125,000,000 |  | $ 75,000,000
Fair Value |  | (1,993,000) |  | (1,993,000) |  | (3,273,000)
Amortization Of Deferred Hedge Gains Losses |  | 61,000 | $ 61,000 | 183,000 | $ 183,000 |
Change in Fair Value on Loans Held for Sale |  | 47,000 | $ (181,000) | 60,000 | $ 3,000 |
Positions One [Member] |  |  |  |  |  |
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes |  |  |  |  |  |
Notional Amount |  | $ 25,000,000 |  | $ 25,000,000 |  | $ 25,000,000
Receive (Variable) Index |  |  |  | 3 Month LIBOR |  | 3 Month LIBOR
Trade Date |  |  |  | Feb. 16, 2006 |  | Feb. 16, 2006
Effective Date |  |  |  | Dec. 28, 2006 |  | Dec. 28, 2006
Maturity Date |  |  |  | Dec. 28, 2016 |  | Dec. 28, 2016
Current Rate Received |  | 0.85% |  | 0.85% |  | 0.51%
Pay Fixed Swap Rate |  | 5.04% |  | 5.04% |  | 5.04%
Fair Value |  | $ (255,000) |  | $ (255,000) |  | $ (1,054,000)
Positions Two [Member] |  |  |  |  |  |
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes |  |  |  |  |  |
Notional Amount |  | $ 25,000,000 |  | $ 25,000,000 |  | $ 25,000,000
Receive (Variable) Index |  |  |  | 3 Month LIBOR |  | 3 Month LIBOR
Trade Date |  |  |  | Feb. 16, 2006 |  | Feb. 16, 2006
Effective Date |  |  |  | Dec. 28, 2006 |  | Dec. 28, 2006
Maturity Date |  |  |  | Dec. 28, 2016 |  | Dec. 28, 2016
Current Rate Received |  | 0.85% |  | 0.85% |  | 0.51%
Pay Fixed Swap Rate |  | 5.04% |  | 5.04% |  | 5.04%
Fair Value |  | $ (255,000) |  | $ (255,000) |  | $ (1,055,000)
Positions Four [Member] |  |  |  |  |  |
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes |  |  |  |  |  |
Notional Amount |  | $ 25,000,000 |  | $ 25,000,000 |  | $ 25,000,000
Receive (Variable) Index |  |  |  | 3 Month LIBOR |  | 3 Month LIBOR
Trade Date |  |  |  | Dec. 09, 2008 |  | Dec. 09, 2008
Effective Date |  |  |  | Dec. 10, 2008 |  | Dec. 10, 2008
Maturity Date |  |  |  | Dec. 10, 2018 |  | Dec. 10, 2018
Current Rate Received |  | 0.85% |  | 0.85% |  | 0.49%
Pay Fixed Swap Rate |  | 2.94% |  | 2.94% |  | 2.94%
Fair Value |  | $ (1,068,000) |  | $ (1,068,000) |  | $ (1,164,000)
Positions Three [Member] |  |  |  |  |  |
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes |  |  |  |  |  |
Notional Amount | [1] | $ 25,000,000 |  | $ 25,000,000 |  |
Receive (Variable) Index |  |  |  | 3 Month LIBOR |  |
Trade Date |  |  |  | Apr. 01, 2016 |  |
Effective Date |  |  |  | Jan. 17, 2017 |  |
Maturity Date |  |  |  | Dec. 15, 2021 |  |
Current Rate Received |  | 0.00% |  | 0.00% |  |
Pay Fixed Swap Rate |  | 1.36% |  | 1.36% |  |
Fair Value |  | $ (208,000) |  | $ (208,000) |  |
Position Five [Member] |  |  |  |  |  |
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes |  |  |  |  |  |
Notional Amount | [1] | $ 25,000,000 |  | $ 25,000,000 |  |
Receive (Variable) Index |  |  |  | 3 Month LIBOR |  |
Trade Date |  |  |  | Apr. 01, 2016 |  |
Effective Date |  |  |  | Jan. 17, 2017 |  |
Maturity Date |  |  |  | Dec. 15, 2021 |  |
Current Rate Received |  | 0.00% |  | 0.00% |  |
Pay Fixed Swap Rate |  | 1.36% |  | 1.36% |  |
Fair Value |  | $ (207,000) |  | $ (207,000) |  |
[1] | (1) In April 2016, the Company entered into two forward starting swaps with notional amounts of $25.0 million each, with the intention of hedging $50.0 million of existing junior subordinated debentures, as the current hedges on this borrowing expire in December 2016.

X
- Definition The amount of expense charged against earnings by an entity to record deferred gains and losses on hedge instruments. + References No definition available. + Details
Name: | indb_AmortizationOfDeferredHedgeGainsLosses
Namespace Prefix: | indb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Change in Fair Value on Loans Held for Sale + References No definition available. + Details
Name: | indb_ChangeInFairValueOnLoansHeldForSale
Namespace Prefix: | indb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Current rate received on derivative for interest rate swaps which qualify as hedges. + References No definition available. + Details
Name: | indb_CurrentRateReceivedOnDerivativeForInterestRateSwapsWhichQualifyAsHedges
Namespace Prefix: | indb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Derivative, Trade Date + References No definition available. + Details
Name: | indb_DerivativeTradeDate
Namespace Prefix: | indb_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
Name: | invest_DerivativeNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition When the derivative or group of derivatives presented is a swap, the type of interest rate (fixed, variable, stepped, etc.) paid on the swap. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column A -Footnote 1 + Details
Name: | invest_DerivativeTypeOfInterestRatePaidOnSwap
Namespace Prefix: | invest_
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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13495-108611 + Details
Name: | us-gaap_DerivativeFairValueOfDerivativeNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
Name: | us-gaap_DerivativeFixedInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Date the entity entered into the derivative contract, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_DerivativeInceptionDates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date the derivative contract matures, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_DerivativeMaturityDates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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

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

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

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

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