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Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Revenue from Contract with Customer [Abstract] |  |  |  |
Service Charges on Deposit Accounts | $ 4,551 | $ 4,392 | $ 8,982 | $ 8,936
Merchant Discount Fees | 3,919 | 3,561 | 7,324 | 6,682
ATM Fees | 736 | 759 | 1,390 | 1,446
Wealth management and advisory services | 6,083 | 5,488 | 11,665 | 10,625
Fees and Commissions Investment Management | 739 | 507 | 1,299 | 984
Merchant Processing Income | 348 | 274 | 779 | 567
Other noninterest income - ASC 606 | 1,060 | 1,259 | 2,034 | 2,081
Total noninterest income in scope of ASC 606 | 17,436 | 16,240 | 33,473 | 31,321
Total noninterest income out of scope of ASC 606 | 4,451 | 5,158 | 8,277 | 8,989
Noninterest Income | $ 21,887 | $ 21,398 | $ 41,750 | $ 40,310

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- Definition Amounts charged for use of automated teller machines or remote service units. + References No definition available. + Details
Name: | indb_ATMFees
Namespace Prefix: | indb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Fees and commissions earned on the sales of mutual fund shares, unit investment trust shares, general securities and life insurance products. + References No definition available. + Details
Name: | indb_FeesandCommissionsInvestmentManagement
Namespace Prefix: | indb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Commission and fee income earned by referring third party merchant processing partners to the Company's customers. + References No definition available. + Details
Name: | indb_MerchantProcessingIncome
Namespace Prefix: | indb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Other various types of noninterest income that falls within the scope of ASC 606. This category of other noninterest income includes but is not limited to safe deposit rent, 1031 exchange fee revenue and foreign currency. + References No definition available. + Details
Name: | indb_OthernoninterestincomeASC606
Namespace Prefix: | indb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Includes amounts charged depositors for: (1) maintenance of their accounts (maintenance charges); (2) failure to maintain specified minimum balances on account; (3) exceeding the number of checks or transactions allowed to be processed in a given period; (4) checks drawn on no minimum balance deposit accounts; (5) withdrawals from non transaction deposit accounts; (6) closing savings accounts before a specified minimum period of time has elapsed; (7) accounts which have remained inactive for extended periods of time or which have become dormant; (8) checks drawn against insufficient funds that the bank assesses regardless of whether it decides to pay, return or hold the check; (9) issuing stop payment orders; (10) certifying checks; and (11) accumulating or disbursing funds deposited in IRAs or Keogh Plan accounts when not handled by the bank's trust department. This item does not include penalties assessed on the early withdrawal of time deposits. + References No definition available. + Details
Name: | indb_ServiceChargesOnDepositAccounts
Namespace Prefix: | indb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Total noninterest income in scope of ASC 606 + References No definition available. + Details
Name: | indb_TotalnoninterestincomeinscopeofASC606
Namespace Prefix: | indb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Total noninterest income out of scope of ASC 606 + References No definition available. + Details
Name: | indb_TotalnoninterestincomeoutofscopeofASC606
Namespace Prefix: | indb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Revenue earned from investment advisory services, including asset management fees. + References No definition available. + Details
Name: | indb_Wealthmanagementandadvisoryservices
Namespace Prefix: | indb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of earnings on fees charged to merchants for the cardholder's use of a credit card. Excludes interest income earned on credit card balances, transactions and credit card services including late, over limit, and annual fees. + References No definition available. + Details
Name: | us-gaap_MerchantDiscountFees
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
Name: | us-gaap_NoninterestIncome
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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