XML 76 R56.htm IDEA: XBRL DOCUMENT
v3.20.2

Loans, Allowance for Loan Losses and Credit Quality (Internal Risk-Rating Categories for the Commercial Portfolio) (Details) $ in Thousands | Dec. 31, 2019 USD ($)
--- | ---
Internal risk-rating categories for the Company's commercial portfolio |
TOTAL | $ 6,119,185
Commercial and Industrial [Member] |
Internal risk-rating categories for the Company's commercial portfolio |
TOTAL | 1,395,036
Commercial Real Estate [Member] |
Internal risk-rating categories for the Company's commercial portfolio |
TOTAL | 4,002,359
Commercial Construction [Member] |
Internal risk-rating categories for the Company's commercial portfolio |
TOTAL | 547,293
Small Business [Member] |
Internal risk-rating categories for the Company's commercial portfolio |
TOTAL | 174,497
PASS [Member] |
Internal risk-rating categories for the Company's commercial portfolio |
TOTAL | 5,848,531
PASS [Member] | Commercial and Industrial [Member] |
Internal risk-rating categories for the Company's commercial portfolio |
TOTAL | 1,274,155
PASS [Member] | Commercial Real Estate [Member] |
Internal risk-rating categories for the Company's commercial portfolio |
TOTAL | 3,860,555
PASS [Member] | Commercial Construction [Member] |
Internal risk-rating categories for the Company's commercial portfolio |
TOTAL | 542,608
PASS [Member] | Small Business [Member] |
Internal risk-rating categories for the Company's commercial portfolio |
TOTAL | 171,213
POTENTIAL WEAKNESS [Member] |
Internal risk-rating categories for the Company's commercial portfolio |
TOTAL | 164,416
POTENTIAL WEAKNESS [Member] | Commercial and Industrial [Member] |
Internal risk-rating categories for the Company's commercial portfolio |
TOTAL | 63,485
POTENTIAL WEAKNESS [Member] | Commercial Real Estate [Member] |
Internal risk-rating categories for the Company's commercial portfolio |
TOTAL | 97,268
POTENTIAL WEAKNESS [Member] | Commercial Construction [Member] |
Internal risk-rating categories for the Company's commercial portfolio |
TOTAL | 2,247
POTENTIAL WEAKNESS [Member] | Small Business [Member] |
Internal risk-rating categories for the Company's commercial portfolio |
TOTAL | 1,416
DEFINITE WEAKNESS-LOSS UNLIKELY [Member] |
Internal risk-rating categories for the Company's commercial portfolio |
TOTAL | 106,238
DEFINITE WEAKNESS-LOSS UNLIKELY [Member] | Commercial and Industrial [Member] |
Internal risk-rating categories for the Company's commercial portfolio |
TOTAL | 57,396
DEFINITE WEAKNESS-LOSS UNLIKELY [Member] | Commercial Real Estate [Member] |
Internal risk-rating categories for the Company's commercial portfolio |
TOTAL | 44,536
DEFINITE WEAKNESS-LOSS UNLIKELY [Member] | Commercial Construction [Member] |
Internal risk-rating categories for the Company's commercial portfolio |
TOTAL | 2,438
DEFINITE WEAKNESS-LOSS UNLIKELY [Member] | Small Business [Member] |
Internal risk-rating categories for the Company's commercial portfolio |
TOTAL | 1,868
PARTIAL LOSS PROBABLE [Member] |
Internal risk-rating categories for the Company's commercial portfolio |
TOTAL | 0
PARTIAL LOSS PROBABLE [Member] | Commercial and Industrial [Member] |
Internal risk-rating categories for the Company's commercial portfolio |
TOTAL | 0
PARTIAL LOSS PROBABLE [Member] | Commercial Real Estate [Member] |
Internal risk-rating categories for the Company's commercial portfolio |
TOTAL | 0
PARTIAL LOSS PROBABLE [Member] | Commercial Construction [Member] |
Internal risk-rating categories for the Company's commercial portfolio |
TOTAL | 0
PARTIAL LOSS PROBABLE [Member] | Small Business [Member] |
Internal risk-rating categories for the Company's commercial portfolio |
TOTAL | 0
DEFINITE LOSS [Member] |
Internal risk-rating categories for the Company's commercial portfolio |
TOTAL | 0
DEFINITE LOSS [Member] | Commercial and Industrial [Member] |
Internal risk-rating categories for the Company's commercial portfolio |
TOTAL | 0
DEFINITE LOSS [Member] | Commercial Real Estate [Member] |
Internal risk-rating categories for the Company's commercial portfolio |
TOTAL | 0
DEFINITE LOSS [Member] | Commercial Construction [Member] |
Internal risk-rating categories for the Company's commercial portfolio |
TOTAL | 0
DEFINITE LOSS [Member] | Small Business [Member] |
Internal risk-rating categories for the Company's commercial portfolio |
TOTAL | $ 0

X
- Definition Summary of internal risk rating categories. + References No definition available. + Details
Name: | indb_SummaryOfInternalRiskRatingCategoriesAbstract
Namespace Prefix: | indb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919230-210447 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 + Details
Name: | us-gaap_NotesReceivableNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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=us-gaap_ConstructionLoansMember
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_InternalCreditAssessmentAxis=us-gaap_PassMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=indb_PotentialWeaknessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=indb_DefiniteWeaknessLossUnlikelyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=indb_PartialLossProbableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=indb_DefiniteLossMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |