XML 82 R61.htm IDEA: XBRL DOCUMENT
v3.6.0.2

SECURITIES (Details 4) $ in Thousands | Dec. 31, 2016 USD ($) holding | Dec. 31, 2015 USD ($) holding
--- | --- | ---
Summary of gross unrealized losses and fair value of investments |  |
No of holdings | holding | 121 | 123
Fair value, less than 12 months | $ 444,471 | $ 304,830
Fair value, 12 months or longer | 56,356 | 92,785
Fair value, Total | 500,827 | 397,615
Unrealized losses, Total | (8,594) | (7,078)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months | (5,510) | (2,882)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months | $ (3,084) | $ (4,196)
US Government Agencies Debt Securities [Member] |  |
Summary of gross unrealized losses and fair value of investments |  |
No of holdings | holding |  | 3
Fair value, less than 12 months |  | $ 1,990
Fair value, 12 months or longer |  | 0
Fair value, Total |  | 1,990
Unrealized losses, Total |  | (4)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months |  | (4)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months |  | $ 0
Agency mortgage-backed securities [Member] |  |
Summary of gross unrealized losses and fair value of investments |  |
No of holdings | holding | 57 | 57
Fair value, less than 12 months | $ 137,949 | $ 112,648
Fair value, 12 months or longer | 0 | 4,297
Fair value, Total | 137,949 | 116,945
Unrealized losses, Total | (1,594) | (1,202)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months | (1,594) | (1,062)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months | $ 0 | $ (140)
Agency collateralized mortgage obligations [Member] |  |
Summary of gross unrealized losses and fair value of investments |  |
No of holdings | holding | 32 | 23
Fair value, less than 12 months | $ 243,051 | $ 147,707
Fair value, 12 months or longer | 47,403 | 80,927
Fair value, Total | 290,454 | 228,634
Unrealized losses, Total | (5,129) | (4,404)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months | (3,140) | (1,420)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months | $ (1,989) | $ (2,984)
Single issuer trust preferred securities issued by banks and insurers |  |
Summary of gross unrealized losses and fair value of investments |  |
No of holdings | holding | 1 | 2
Fair value, less than 12 months | $ 0 | $ 1,018
Fair value, 12 months or longer | 1,036 | 1,018
Fair value, Total | 1,036 | 2,036
Unrealized losses, Total | (3) | (81)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months | 0 | (33)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months | $ (3) | $ (48)
Pooled trust preferred securities issued by banks and insurers |  |
Summary of gross unrealized losses and fair value of investments |  |
No of holdings | holding | 1 | 1
Fair value, less than 12 months | $ 0 | $ 0
Fair value, 12 months or longer | 1,583 | 1,572
Fair value, Total | 1,583 | 1,572
Unrealized losses, Total | (616) | (645)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months | 0 | 0
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months | $ (616) | $ (645)
Small Business Administration Pooled Securities [Member] |  |
Summary of gross unrealized losses and fair value of investments |  |
No of holdings | holding | 5 | 3
Fair value, less than 12 months | $ 59,846 | $ 37,986
Fair value, 12 months or longer | 0 | 0
Fair value, Total | 59,846 | 37,986
Unrealized losses, Total | (699) | (174)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months | $ (699) | $ (174)
Marketable securities [Member] |  |
Summary of gross unrealized losses and fair value of investments |  |
No of holdings | holding | 25 | 34
Fair value, less than 12 months | $ 3,625 | $ 3,481
Fair value, 12 months or longer | 6,334 | 4,971
Fair value, Total | 9,959 | 8,452
Unrealized losses, Total | (553) | (568)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months | (77) | (189)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months | $ (476) | $ (379)

X
- Definition Available for sale and held to maturity securities continuous unrealized loss position aggregate loss. + References No definition available. + Details
Name: | indb_AvailableForSaleAndHeldToMaturitySecuritiesContinuousUnrealizedLossPositionAggregateLoss
Namespace Prefix: | indb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Available for sale and held to maturity securities continuous unrealized loss position fair value. + References No definition available. + Details
Name: | indb_AvailableForSaleAndHeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
Namespace Prefix: | indb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Available for sale and held to maturity securities continuous unrealized loss position fair value. + References No definition available. + Details
Name: | indb_AvailableForSaleAndHeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValueAbstract
Namespace Prefix: | indb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Available for sale securities and held to maturity securities continuous unrealized loss position less than twelve months fair value. + References No definition available. + Details
Name: | indb_AvailableForSaleAndHeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Namespace Prefix: | indb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Available for sale and held to maturity securities continuous unrealized loss position twelve months or longer fair value. + References No definition available. + Details
Name: | indb_AvailableForSaleAndHeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Namespace Prefix: | indb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Available for sale and held to maturity securities in unrealized loss positions qualitative disclosure number of positions. + References No definition available. + Details
Name: | indb_AvailableForSaleAndHeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
Namespace Prefix: | indb_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months + References No definition available. + Details
Name: | indb_Unrealizedlosspositionforavailableforsaleandheldtomaturitysecuritiesinacontinuouslosspositionforlessthan12months
Namespace Prefix: | indb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months + References No definition available. + Details
Name: | indb_Unrealizedlosspositionforavailableforsaleandheldtomaturitysecuritiesinacontinuouslosspositionformorethan12months
Namespace Prefix: | indb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_DebtSecurityAxis=us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtSecurityAxis=us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtSecurityAxis=us-gaap_CollateralizedDebtObligationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtSecurityAxis=indb_SingleIssuerTrustPreferredSecuritiesIssuedByBanksMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtSecurityAxis=indb_PooledTrustPreferredSecuritiesIssuedByBanksAndInsurersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtSecurityAxis=indb_SmallBusinessAdministrationPooledSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtSecurityAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |