<?xml version="1.0" encoding="utf-8"?>
<xbrl
  xml:lang="en-US"
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:dei="http://xbrl.sec.gov/dei/2020-01-31"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:xbrldi="http://xbrl.org/2006/xbrldi"
  xmlns:xlink="http://www.w3.org/1999/xlink">
    <link:schemaRef xlink:href="indb-20211110.xsd" xlink:type="simple"/>
    <context id="i183246ed05fe435984aadd765e5ff051_D20211110-20211110">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000776901</identifier>
        </entity>
        <period>
            <startDate>2021-11-10</startDate>
            <endDate>2021-11-10</endDate>
        </period>
    </context>
    <context id="i8ac209b2f27843ef8359ca103bc132f7_D20211110-20211110">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000776901</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:EntityAddressesAddressTypeAxis">dei:MailingAddressMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-11-10</startDate>
            <endDate>2021-11-10</endDate>
        </period>
    </context>
    <dei:DocumentType
      contextRef="i183246ed05fe435984aadd765e5ff051_D20211110-20211110"
      id="id3VybDovL2RvY3MudjEvZG9jOmUyYjI4M2JmMjU1ZTRjMzFiODMzYmMwZDM5NzI0ZThlL3NlYzplMmIyODNiZjI1NWU0YzMxYjgzM2JjMGQzOTcyNGU4ZV80L2ZyYWc6MzZmODZmN2Q2N2I4NDFiNmJjODUwYTg5ODczY2EwMmYvdGFibGU6OTBlMzIzOGNjYTkzNDA4YmJlMTMxMjdjZjAxODMxM2MvdGFibGVyYW5nZTo5MGUzMjM4Y2NhOTM0MDhiYmUxMzEyN2NmMDE4MzEzY18xLTEtMS0xLTM5MjYz_53a0798f-e930-4a10-9dc2-696439578dbc">8-K</dei:DocumentType>
    <dei:DocumentPeriodEndDate
      contextRef="i183246ed05fe435984aadd765e5ff051_D20211110-20211110"
      id="id3VybDovL2RvY3MudjEvZG9jOmUyYjI4M2JmMjU1ZTRjMzFiODMzYmMwZDM5NzI0ZThlL3NlYzplMmIyODNiZjI1NWU0YzMxYjgzM2JjMGQzOTcyNGU4ZV80L2ZyYWc6MzZmODZmN2Q2N2I4NDFiNmJjODUwYTg5ODczY2EwMmYvdGFibGU6OTBlMzIzOGNjYTkzNDA4YmJlMTMxMjdjZjAxODMxM2MvdGFibGVyYW5nZTo5MGUzMjM4Y2NhOTM0MDhiYmUxMzEyN2NmMDE4MzEzY18yLTEtMS0xLTM5MjYz_433ef938-cc3e-40f1-9111-9e83ba16ecea">2021-11-10</dei:DocumentPeriodEndDate>
    <dei:EntityRegistrantName
      contextRef="i183246ed05fe435984aadd765e5ff051_D20211110-20211110"
      id="id3VybDovL2RvY3MudjEvZG9jOmUyYjI4M2JmMjU1ZTRjMzFiODMzYmMwZDM5NzI0ZThlL3NlYzplMmIyODNiZjI1NWU0YzMxYjgzM2JjMGQzOTcyNGU4ZV80L2ZyYWc6MzZmODZmN2Q2N2I4NDFiNmJjODUwYTg5ODczY2EwMmYvdGFibGU6OTBlMzIzOGNjYTkzNDA4YmJlMTMxMjdjZjAxODMxM2MvdGFibGVyYW5nZTo5MGUzMjM4Y2NhOTM0MDhiYmUxMzEyN2NmMDE4MzEzY18zLTEtMS0xLTM5MjYz_d3be28fa-d216-497a-a291-6af4bd0c73c7">INDEPENDENT BANK CORP.</dei:EntityRegistrantName>
    <dei:EntityIncorporationStateCountryCode
      contextRef="i183246ed05fe435984aadd765e5ff051_D20211110-20211110"
      id="id3VybDovL2RvY3MudjEvZG9jOmUyYjI4M2JmMjU1ZTRjMzFiODMzYmMwZDM5NzI0ZThlL3NlYzplMmIyODNiZjI1NWU0YzMxYjgzM2JjMGQzOTcyNGU4ZV80L2ZyYWc6MzZmODZmN2Q2N2I4NDFiNmJjODUwYTg5ODczY2EwMmYvdGFibGU6OTBlMzIzOGNjYTkzNDA4YmJlMTMxMjdjZjAxODMxM2MvdGFibGVyYW5nZTo5MGUzMjM4Y2NhOTM0MDhiYmUxMzEyN2NmMDE4MzEzY180LTEtMS0xLTM5MjYz_0081c3ae-30a3-42d6-b0e5-dba24c94117c">MA</dei:EntityIncorporationStateCountryCode>
    <dei:EntityFileNumber
      contextRef="i183246ed05fe435984aadd765e5ff051_D20211110-20211110"
      id="id3VybDovL2RvY3MudjEvZG9jOmUyYjI4M2JmMjU1ZTRjMzFiODMzYmMwZDM5NzI0ZThlL3NlYzplMmIyODNiZjI1NWU0YzMxYjgzM2JjMGQzOTcyNGU4ZV80L2ZyYWc6MzZmODZmN2Q2N2I4NDFiNmJjODUwYTg5ODczY2EwMmYvdGFibGU6OTBlMzIzOGNjYTkzNDA4YmJlMTMxMjdjZjAxODMxM2MvdGFibGVyYW5nZTo5MGUzMjM4Y2NhOTM0MDhiYmUxMzEyN2NmMDE4MzEzY181LTEtMS0xLTM5MjYz_e09cb834-c7d4-4bf2-84af-a2f001cde78b">1-9047</dei:EntityFileNumber>
    <dei:CityAreaCode
      contextRef="i183246ed05fe435984aadd765e5ff051_D20211110-20211110"
      id="id3VybDovL2RvY3MudjEvZG9jOmUyYjI4M2JmMjU1ZTRjMzFiODMzYmMwZDM5NzI0ZThlL3NlYzplMmIyODNiZjI1NWU0YzMxYjgzM2JjMGQzOTcyNGU4ZV80L2ZyYWc6MzZmODZmN2Q2N2I4NDFiNmJjODUwYTg5ODczY2EwMmYvdGFibGU6OTBlMzIzOGNjYTkzNDA4YmJlMTMxMjdjZjAxODMxM2MvdGFibGVyYW5nZTo5MGUzMjM4Y2NhOTM0MDhiYmUxMzEyN2NmMDE4MzEzY182LTEtMS0xLTM5MjYz_4b7b8228-07ba-4d00-9241-a0bddebea887">781</dei:CityAreaCode>
    <dei:LocalPhoneNumber
      contextRef="i183246ed05fe435984aadd765e5ff051_D20211110-20211110"
      id="id3VybDovL2RvY3MudjEvZG9jOmUyYjI4M2JmMjU1ZTRjMzFiODMzYmMwZDM5NzI0ZThlL3NlYzplMmIyODNiZjI1NWU0YzMxYjgzM2JjMGQzOTcyNGU4ZV80L2ZyYWc6MzZmODZmN2Q2N2I4NDFiNmJjODUwYTg5ODczY2EwMmYvdGFibGU6OTBlMzIzOGNjYTkzNDA4YmJlMTMxMjdjZjAxODMxM2MvdGFibGVyYW5nZTo5MGUzMjM4Y2NhOTM0MDhiYmUxMzEyN2NmMDE4MzEzY183LTEtMS0xLTM5MjYz_aad65904-36c9-43b1-a7cd-0286380f8d19">878-6100</dei:LocalPhoneNumber>
    <dei:EntityCentralIndexKey
      contextRef="i183246ed05fe435984aadd765e5ff051_D20211110-20211110"
      id="id3VybDovL2RvY3MudjEvZG9jOmUyYjI4M2JmMjU1ZTRjMzFiODMzYmMwZDM5NzI0ZThlL3NlYzplMmIyODNiZjI1NWU0YzMxYjgzM2JjMGQzOTcyNGU4ZV80L2ZyYWc6MzZmODZmN2Q2N2I4NDFiNmJjODUwYTg5ODczY2EwMmYvdGFibGU6OTBlMzIzOGNjYTkzNDA4YmJlMTMxMjdjZjAxODMxM2MvdGFibGVyYW5nZTo5MGUzMjM4Y2NhOTM0MDhiYmUxMzEyN2NmMDE4MzEzY185LTEtMS0xLTM5MjYz_473343c3-83eb-4390-92b1-391207dde0f0">0000776901</dei:EntityCentralIndexKey>
    <dei:AmendmentFlag
      contextRef="i183246ed05fe435984aadd765e5ff051_D20211110-20211110"
      id="id3VybDovL2RvY3MudjEvZG9jOmUyYjI4M2JmMjU1ZTRjMzFiODMzYmMwZDM5NzI0ZThlL3NlYzplMmIyODNiZjI1NWU0YzMxYjgzM2JjMGQzOTcyNGU4ZV80L2ZyYWc6MzZmODZmN2Q2N2I4NDFiNmJjODUwYTg5ODczY2EwMmYvdGFibGU6OTBlMzIzOGNjYTkzNDA4YmJlMTMxMjdjZjAxODMxM2MvdGFibGVyYW5nZTo5MGUzMjM4Y2NhOTM0MDhiYmUxMzEyN2NmMDE4MzEzY18xMC0xLTEtMS0zOTI2Mw_6c8b8e93-f46c-4253-8c98-08bbeb8cf72a">false</dei:AmendmentFlag>
    <dei:DocumentType
      contextRef="i183246ed05fe435984aadd765e5ff051_D20211110-20211110"
      id="id3VybDovL2RvY3MudjEvZG9jOmUyYjI4M2JmMjU1ZTRjMzFiODMzYmMwZDM5NzI0ZThlL3NlYzplMmIyODNiZjI1NWU0YzMxYjgzM2JjMGQzOTcyNGU4ZV8xL2ZyYWc6N2FjNjYxYTc2Yjg1NDAyMzhmZGI5MDE0NWM0NDA3ZTUvdGV4dHJlZ2lvbjo3YWM2NjFhNzZiODU0MDIzOGZkYjkwMTQ1YzQ0MDdlNV84Mw_53a0798f-e930-4a10-9dc2-696439578dbc">8-K</dei:DocumentType>
    <dei:DocumentPeriodEndDate
      contextRef="i183246ed05fe435984aadd765e5ff051_D20211110-20211110"
      id="id3VybDovL2RvY3MudjEvZG9jOmUyYjI4M2JmMjU1ZTRjMzFiODMzYmMwZDM5NzI0ZThlL3NlYzplMmIyODNiZjI1NWU0YzMxYjgzM2JjMGQzOTcyNGU4ZV8xL2ZyYWc6N2FjNjYxYTc2Yjg1NDAyMzhmZGI5MDE0NWM0NDA3ZTUvdGV4dHJlZ2lvbjo3YWM2NjFhNzZiODU0MDIzOGZkYjkwMTQ1YzQ0MDdlNV8xOTY_433ef938-cc3e-40f1-9111-9e83ba16ecea">2021-11-10</dei:DocumentPeriodEndDate>
    <dei:EntityIncorporationStateCountryCode
      contextRef="i183246ed05fe435984aadd765e5ff051_D20211110-20211110"
      id="id3VybDovL2RvY3MudjEvZG9jOmUyYjI4M2JmMjU1ZTRjMzFiODMzYmMwZDM5NzI0ZThlL3NlYzplMmIyODNiZjI1NWU0YzMxYjgzM2JjMGQzOTcyNGU4ZV8xL2ZyYWc6N2FjNjYxYTc2Yjg1NDAyMzhmZGI5MDE0NWM0NDA3ZTUvdGV4dHJlZ2lvbjo3YWM2NjFhNzZiODU0MDIzOGZkYjkwMTQ1YzQ0MDdlNV8yMzU_0081c3ae-30a3-42d6-b0e5-dba24c94117c">MA</dei:EntityIncorporationStateCountryCode>
    <dei:EntityFileNumber
      contextRef="i183246ed05fe435984aadd765e5ff051_D20211110-20211110"
      id="id3VybDovL2RvY3MudjEvZG9jOmUyYjI4M2JmMjU1ZTRjMzFiODMzYmMwZDM5NzI0ZThlL3NlYzplMmIyODNiZjI1NWU0YzMxYjgzM2JjMGQzOTcyNGU4ZV8xL2ZyYWc6N2FjNjYxYTc2Yjg1NDAyMzhmZGI5MDE0NWM0NDA3ZTUvdGFibGU6ZmEzNzc1ZjI4YTBjNDJiZGEwZjY1ODU1ZDllMTZiOWMvdGFibGVyYW5nZTpmYTM3NzVmMjhhMGM0MmJkYTBmNjU4NTVkOWUxNmI5Y18wLTAtMS0xLTM5MjYz_e09cb834-c7d4-4bf2-84af-a2f001cde78b">1-9047</dei:EntityFileNumber>
    <dei:EntityTaxIdentificationNumber
      contextRef="i183246ed05fe435984aadd765e5ff051_D20211110-20211110"
      id="id3VybDovL2RvY3MudjEvZG9jOmUyYjI4M2JmMjU1ZTRjMzFiODMzYmMwZDM5NzI0ZThlL3NlYzplMmIyODNiZjI1NWU0YzMxYjgzM2JjMGQzOTcyNGU4ZV8xL2ZyYWc6N2FjNjYxYTc2Yjg1NDAyMzhmZGI5MDE0NWM0NDA3ZTUvdGFibGU6ZmEzNzc1ZjI4YTBjNDJiZGEwZjY1ODU1ZDllMTZiOWMvdGFibGVyYW5nZTpmYTM3NzVmMjhhMGM0MmJkYTBmNjU4NTVkOWUxNmI5Y18wLTItMS0xLTM5MjYz_898f3a2d-8eaf-41e6-ac1d-aaec58a699b3">04-2870273</dei:EntityTaxIdentificationNumber>
    <dei:EntityRegistrantName
      contextRef="i183246ed05fe435984aadd765e5ff051_D20211110-20211110"
      id="id3VybDovL2RvY3MudjEvZG9jOmUyYjI4M2JmMjU1ZTRjMzFiODMzYmMwZDM5NzI0ZThlL3NlYzplMmIyODNiZjI1NWU0YzMxYjgzM2JjMGQzOTcyNGU4ZV8xL2ZyYWc6N2FjNjYxYTc2Yjg1NDAyMzhmZGI5MDE0NWM0NDA3ZTUvdGFibGU6YmE4N2QwYzA2NDBhNGRlOTkzNDUyNmM1YmZiYjc0YzQvdGFibGVyYW5nZTpiYTg3ZDBjMDY0MGE0ZGU5OTM0NTI2YzViZmJiNzRjNF8wLTAtMS0xLTM5MjYz_d3be28fa-d216-497a-a291-6af4bd0c73c7">INDEPENDENT BANK CORP.</dei:EntityRegistrantName>
    <dei:EntityAddressAddressLine1
      contextRef="i183246ed05fe435984aadd765e5ff051_D20211110-20211110"
      id="id3VybDovL2RvY3MudjEvZG9jOmUyYjI4M2JmMjU1ZTRjMzFiODMzYmMwZDM5NzI0ZThlL3NlYzplMmIyODNiZjI1NWU0YzMxYjgzM2JjMGQzOTcyNGU4ZV8xL2ZyYWc6N2FjNjYxYTc2Yjg1NDAyMzhmZGI5MDE0NWM0NDA3ZTUvdGFibGU6YmE4N2QwYzA2NDBhNGRlOTkzNDUyNmM1YmZiYjc0YzQvdGFibGVyYW5nZTpiYTg3ZDBjMDY0MGE0ZGU5OTM0NTI2YzViZmJiNzRjNF8xLTEtMS0xLTM5MjYz_ba9b23fa-fe88-4c01-a481-e1abe0cf94eb">2036 Washington Street,</dei:EntityAddressAddressLine1>
    <dei:EntityAddressCityOrTown
      contextRef="i183246ed05fe435984aadd765e5ff051_D20211110-20211110"
      id="id3VybDovL2RvY3MudjEvZG9jOmUyYjI4M2JmMjU1ZTRjMzFiODMzYmMwZDM5NzI0ZThlL3NlYzplMmIyODNiZjI1NWU0YzMxYjgzM2JjMGQzOTcyNGU4ZV8xL2ZyYWc6N2FjNjYxYTc2Yjg1NDAyMzhmZGI5MDE0NWM0NDA3ZTUvdGFibGU6YmE4N2QwYzA2NDBhNGRlOTkzNDUyNmM1YmZiYjc0YzQvdGFibGVyYW5nZTpiYTg3ZDBjMDY0MGE0ZGU5OTM0NTI2YzViZmJiNzRjNF8xLTItMS0xLTM5MjYz_95e946ef-ed7c-468a-b5df-4fd01e4008b7">Hanover,</dei:EntityAddressCityOrTown>
    <dei:EntityAddressStateOrProvince
      contextRef="i183246ed05fe435984aadd765e5ff051_D20211110-20211110"
      id="id3VybDovL2RvY3MudjEvZG9jOmUyYjI4M2JmMjU1ZTRjMzFiODMzYmMwZDM5NzI0ZThlL3NlYzplMmIyODNiZjI1NWU0YzMxYjgzM2JjMGQzOTcyNGU4ZV8xL2ZyYWc6N2FjNjYxYTc2Yjg1NDAyMzhmZGI5MDE0NWM0NDA3ZTUvdGFibGU6YmE4N2QwYzA2NDBhNGRlOTkzNDUyNmM1YmZiYjc0YzQvdGFibGVyYW5nZTpiYTg3ZDBjMDY0MGE0ZGU5OTM0NTI2YzViZmJiNzRjNF8xLTMtMS0xLTM5MjYz_7dc57dcf-3f17-4cf0-bf75-18c69a73ced3">MA</dei:EntityAddressStateOrProvince>
    <dei:EntityAddressPostalZipCode
      contextRef="i183246ed05fe435984aadd765e5ff051_D20211110-20211110"
      id="id3VybDovL2RvY3MudjEvZG9jOmUyYjI4M2JmMjU1ZTRjMzFiODMzYmMwZDM5NzI0ZThlL3NlYzplMmIyODNiZjI1NWU0YzMxYjgzM2JjMGQzOTcyNGU4ZV8xL2ZyYWc6N2FjNjYxYTc2Yjg1NDAyMzhmZGI5MDE0NWM0NDA3ZTUvdGFibGU6YmE4N2QwYzA2NDBhNGRlOTkzNDUyNmM1YmZiYjc0YzQvdGFibGVyYW5nZTpiYTg3ZDBjMDY0MGE0ZGU5OTM0NTI2YzViZmJiNzRjNF8xLTQtMS0xLTM5MjYz_c6ce7a1f-fbfd-4f59-8473-357e096f4650">02339</dei:EntityAddressPostalZipCode>
    <dei:EntityAddressAddressLine1
      contextRef="i8ac209b2f27843ef8359ca103bc132f7_D20211110-20211110"
      id="id3VybDovL2RvY3MudjEvZG9jOmUyYjI4M2JmMjU1ZTRjMzFiODMzYmMwZDM5NzI0ZThlL3NlYzplMmIyODNiZjI1NWU0YzMxYjgzM2JjMGQzOTcyNGU4ZV8xL2ZyYWc6N2FjNjYxYTc2Yjg1NDAyMzhmZGI5MDE0NWM0NDA3ZTUvdGFibGU6YmE4N2QwYzA2NDBhNGRlOTkzNDUyNmM1YmZiYjc0YzQvdGFibGVyYW5nZTpiYTg3ZDBjMDY0MGE0ZGU5OTM0NTI2YzViZmJiNzRjNF8yLTEtMS0xLTM5MjYz_9bf4c4ef-7bb7-40fa-9cc7-10bf24e90b47">288 Union Street,</dei:EntityAddressAddressLine1>
    <dei:EntityAddressCityOrTown
      contextRef="i8ac209b2f27843ef8359ca103bc132f7_D20211110-20211110"
      id="id3VybDovL2RvY3MudjEvZG9jOmUyYjI4M2JmMjU1ZTRjMzFiODMzYmMwZDM5NzI0ZThlL3NlYzplMmIyODNiZjI1NWU0YzMxYjgzM2JjMGQzOTcyNGU4ZV8xL2ZyYWc6N2FjNjYxYTc2Yjg1NDAyMzhmZGI5MDE0NWM0NDA3ZTUvdGFibGU6YmE4N2QwYzA2NDBhNGRlOTkzNDUyNmM1YmZiYjc0YzQvdGFibGVyYW5nZTpiYTg3ZDBjMDY0MGE0ZGU5OTM0NTI2YzViZmJiNzRjNF8yLTItMS0xLTM5MjYz_c3319acd-88c3-4845-ad37-c774da35bf7b">Rockland,</dei:EntityAddressCityOrTown>
    <dei:EntityAddressStateOrProvince
      contextRef="i8ac209b2f27843ef8359ca103bc132f7_D20211110-20211110"
      id="id3VybDovL2RvY3MudjEvZG9jOmUyYjI4M2JmMjU1ZTRjMzFiODMzYmMwZDM5NzI0ZThlL3NlYzplMmIyODNiZjI1NWU0YzMxYjgzM2JjMGQzOTcyNGU4ZV8xL2ZyYWc6N2FjNjYxYTc2Yjg1NDAyMzhmZGI5MDE0NWM0NDA3ZTUvdGFibGU6YmE4N2QwYzA2NDBhNGRlOTkzNDUyNmM1YmZiYjc0YzQvdGFibGVyYW5nZTpiYTg3ZDBjMDY0MGE0ZGU5OTM0NTI2YzViZmJiNzRjNF8yLTMtMS0xLTM5MjYz_ed74ebfc-01f8-4d10-bea7-00202b975b10">MA</dei:EntityAddressStateOrProvince>
    <dei:EntityAddressPostalZipCode
      contextRef="i8ac209b2f27843ef8359ca103bc132f7_D20211110-20211110"
      id="id3VybDovL2RvY3MudjEvZG9jOmUyYjI4M2JmMjU1ZTRjMzFiODMzYmMwZDM5NzI0ZThlL3NlYzplMmIyODNiZjI1NWU0YzMxYjgzM2JjMGQzOTcyNGU4ZV8xL2ZyYWc6N2FjNjYxYTc2Yjg1NDAyMzhmZGI5MDE0NWM0NDA3ZTUvdGFibGU6YmE4N2QwYzA2NDBhNGRlOTkzNDUyNmM1YmZiYjc0YzQvdGFibGVyYW5nZTpiYTg3ZDBjMDY0MGE0ZGU5OTM0NTI2YzViZmJiNzRjNF8yLTQtMS0xLTM5MjYz_8f6f19eb-ed09-4ef6-ba0a-6502791067bd">02370</dei:EntityAddressPostalZipCode>
    <dei:CityAreaCode
      contextRef="i183246ed05fe435984aadd765e5ff051_D20211110-20211110"
      id="id3VybDovL2RvY3MudjEvZG9jOmUyYjI4M2JmMjU1ZTRjMzFiODMzYmMwZDM5NzI0ZThlL3NlYzplMmIyODNiZjI1NWU0YzMxYjgzM2JjMGQzOTcyNGU4ZV8xL2ZyYWc6N2FjNjYxYTc2Yjg1NDAyMzhmZGI5MDE0NWM0NDA3ZTUvdGV4dHJlZ2lvbjo3YWM2NjFhNzZiODU0MDIzOGZkYjkwMTQ1YzQ0MDdlNV8zOTE_4b7b8228-07ba-4d00-9241-a0bddebea887">781</dei:CityAreaCode>
    <dei:LocalPhoneNumber
      contextRef="i183246ed05fe435984aadd765e5ff051_D20211110-20211110"
      id="id3VybDovL2RvY3MudjEvZG9jOmUyYjI4M2JmMjU1ZTRjMzFiODMzYmMwZDM5NzI0ZThlL3NlYzplMmIyODNiZjI1NWU0YzMxYjgzM2JjMGQzOTcyNGU4ZV8xL2ZyYWc6N2FjNjYxYTc2Yjg1NDAyMzhmZGI5MDE0NWM0NDA3ZTUvdGV4dHJlZ2lvbjo3YWM2NjFhNzZiODU0MDIzOGZkYjkwMTQ1YzQ0MDdlNV8zOTU_aad65904-36c9-43b1-a7cd-0286380f8d19">878-6100</dei:LocalPhoneNumber>
    <dei:WrittenCommunications
      contextRef="i183246ed05fe435984aadd765e5ff051_D20211110-20211110"
      id="id3VybDovL2RvY3MudjEvZG9jOmUyYjI4M2JmMjU1ZTRjMzFiODMzYmMwZDM5NzI0ZThlL3NlYzplMmIyODNiZjI1NWU0YzMxYjgzM2JjMGQzOTcyNGU4ZV8xL2ZyYWc6N2FjNjYxYTc2Yjg1NDAyMzhmZGI5MDE0NWM0NDA3ZTUvdGFibGU6MTg5YmRiZDk2YjNjNDFmMDhiZDNmMzU5ODMwZmViNDgvdGFibGVyYW5nZToxODliZGJkOTZiM2M0MWYwOGJkM2YzNTk4MzBmZWI0OF8wLTAtMS0xLTM5MjYz_9053006b-cf5b-4082-94f5-1eb14b275845">false</dei:WrittenCommunications>
    <dei:SolicitingMaterial
      contextRef="i183246ed05fe435984aadd765e5ff051_D20211110-20211110"
      id="id3VybDovL2RvY3MudjEvZG9jOmUyYjI4M2JmMjU1ZTRjMzFiODMzYmMwZDM5NzI0ZThlL3NlYzplMmIyODNiZjI1NWU0YzMxYjgzM2JjMGQzOTcyNGU4ZV8xL2ZyYWc6N2FjNjYxYTc2Yjg1NDAyMzhmZGI5MDE0NWM0NDA3ZTUvdGFibGU6MTg5YmRiZDk2YjNjNDFmMDhiZDNmMzU5ODMwZmViNDgvdGFibGVyYW5nZToxODliZGJkOTZiM2M0MWYwOGJkM2YzNTk4MzBmZWI0OF8xLTAtMS0xLTM5MjYz_9aa259e0-0ea7-4533-8af9-dbb48a293bff">false</dei:SolicitingMaterial>
    <dei:PreCommencementTenderOffer
      contextRef="i183246ed05fe435984aadd765e5ff051_D20211110-20211110"
      id="id3VybDovL2RvY3MudjEvZG9jOmUyYjI4M2JmMjU1ZTRjMzFiODMzYmMwZDM5NzI0ZThlL3NlYzplMmIyODNiZjI1NWU0YzMxYjgzM2JjMGQzOTcyNGU4ZV8xL2ZyYWc6N2FjNjYxYTc2Yjg1NDAyMzhmZGI5MDE0NWM0NDA3ZTUvdGFibGU6MTg5YmRiZDk2YjNjNDFmMDhiZDNmMzU5ODMwZmViNDgvdGFibGVyYW5nZToxODliZGJkOTZiM2M0MWYwOGJkM2YzNTk4MzBmZWI0OF8yLTAtMS0xLTM5MjYz_8e3bf433-09fe-4ec3-9d57-e1440b6eaf58">false</dei:PreCommencementTenderOffer>
    <dei:PreCommencementIssuerTenderOffer
      contextRef="i183246ed05fe435984aadd765e5ff051_D20211110-20211110"
      id="id3VybDovL2RvY3MudjEvZG9jOmUyYjI4M2JmMjU1ZTRjMzFiODMzYmMwZDM5NzI0ZThlL3NlYzplMmIyODNiZjI1NWU0YzMxYjgzM2JjMGQzOTcyNGU4ZV8xL2ZyYWc6N2FjNjYxYTc2Yjg1NDAyMzhmZGI5MDE0NWM0NDA3ZTUvdGFibGU6MTg5YmRiZDk2YjNjNDFmMDhiZDNmMzU5ODMwZmViNDgvdGFibGVyYW5nZToxODliZGJkOTZiM2M0MWYwOGJkM2YzNTk4MzBmZWI0OF8zLTAtMS0xLTM5MjYz_9e3dc9de-439c-43db-b1ae-70f4220bab7d">false</dei:PreCommencementIssuerTenderOffer>
    <dei:Security12bTitle
      contextRef="i183246ed05fe435984aadd765e5ff051_D20211110-20211110"
      id="id3VybDovL2RvY3MudjEvZG9jOmUyYjI4M2JmMjU1ZTRjMzFiODMzYmMwZDM5NzI0ZThlL3NlYzplMmIyODNiZjI1NWU0YzMxYjgzM2JjMGQzOTcyNGU4ZV8xL2ZyYWc6N2FjNjYxYTc2Yjg1NDAyMzhmZGI5MDE0NWM0NDA3ZTUvdGFibGU6ZjNjZWFlNDMxNWI2NDRkYmEyZjZlYTBmMWIyYmE4ZDQvdGFibGVyYW5nZTpmM2NlYWU0MzE1YjY0NGRiYTJmNmVhMGYxYjJiYThkNF8yLTAtMS0xLTM5MjYz_13965ce8-58c5-469b-aa6a-a4a9700a3d83">Common Stock, $0.01 par value per share</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="i183246ed05fe435984aadd765e5ff051_D20211110-20211110"
      id="id3VybDovL2RvY3MudjEvZG9jOmUyYjI4M2JmMjU1ZTRjMzFiODMzYmMwZDM5NzI0ZThlL3NlYzplMmIyODNiZjI1NWU0YzMxYjgzM2JjMGQzOTcyNGU4ZV8xL2ZyYWc6N2FjNjYxYTc2Yjg1NDAyMzhmZGI5MDE0NWM0NDA3ZTUvdGFibGU6ZjNjZWFlNDMxNWI2NDRkYmEyZjZlYTBmMWIyYmE4ZDQvdGFibGVyYW5nZTpmM2NlYWU0MzE1YjY0NGRiYTJmNmVhMGYxYjJiYThkNF8yLTEtMS0xLTM5MjYz_0e5513ad-c1a8-4243-aa2b-991521a76cd7">INDB</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="i183246ed05fe435984aadd765e5ff051_D20211110-20211110"
      id="id3VybDovL2RvY3MudjEvZG9jOmUyYjI4M2JmMjU1ZTRjMzFiODMzYmMwZDM5NzI0ZThlL3NlYzplMmIyODNiZjI1NWU0YzMxYjgzM2JjMGQzOTcyNGU4ZV8xL2ZyYWc6N2FjNjYxYTc2Yjg1NDAyMzhmZGI5MDE0NWM0NDA3ZTUvdGFibGU6ZjNjZWFlNDMxNWI2NDRkYmEyZjZlYTBmMWIyYmE4ZDQvdGFibGVyYW5nZTpmM2NlYWU0MzE1YjY0NGRiYTJmNmVhMGYxYjJiYThkNF8yLTItMS0xLTM5MjYz_e382cb5e-742b-4df6-bfe0-e5efe87b244a">NASDAQ</dei:SecurityExchangeName>
    <dei:EntityEmergingGrowthCompany
      contextRef="i183246ed05fe435984aadd765e5ff051_D20211110-20211110"
      id="id3VybDovL2RvY3MudjEvZG9jOmUyYjI4M2JmMjU1ZTRjMzFiODMzYmMwZDM5NzI0ZThlL3NlYzplMmIyODNiZjI1NWU0YzMxYjgzM2JjMGQzOTcyNGU4ZV8xL2ZyYWc6N2FjNjYxYTc2Yjg1NDAyMzhmZGI5MDE0NWM0NDA3ZTUvdGFibGU6OTgxN2Y0NTEyMmM3NDk5NDg1M2QwOTg5ZDA1YWFmYTgvdGFibGVyYW5nZTo5ODE3ZjQ1MTIyYzc0OTk0ODUzZDA5ODlkMDVhYWZhOF8wLTEtMS0xLTM5MjYz_2fa15813-d497-46aa-bead-5335ee7e69df">false</dei:EntityEmergingGrowthCompany>
</xbrl>
