XML 85 R57.htm IDEA: XBRL DOCUMENT
v3.8.0.1

ACQUISITIONS (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
May 12, 2017 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Nov. 10, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition Related Costs |  | $ 0 | $ 0 | $ 2,909 | $ 484 | $ 4,764 | $ 151 | $ 206 | $ 334 | $ 3,393 | $ 5,455 | $ 10,501 |
Island Bancorp, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Interest Issued or Issuable Shareholders Option To Receive, Cash Per Share | $ 500 |  |  |  |  |  |  |  |  |  |  |  |
Number of shares of company stock issued for each share of Central common stock (in shares) | 9.525 |  |  |  |  |  |  |  |  |  |  |  |
Value of shares of company stock issued for each share of acquiree stock (in dollars per share) | $ 605.31 |  |  |  |  |  |  |  |  |  |  |  |
Company's closing price per share (in dollars per share) | $ 63.55 |  |  |  |  |  |  |  |  |  |  |  |
Business transaction value | $ 28,300 |  |  |  |  |  |  |  |  |  |  |  |
Cost of acquired entity, percentage cash | 20.00% |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Cost of Acquired Entity, Percentage Stock Consideration | 80.00% |  |  |  |  |  |  |  |  |  |  |  |
Cost of acquired entity, cash paid | $ 4,800 |  |  |  |  |  |  |  |  |  |  |  |
Consideration Transferred, Equity Interests Issued and Issuable | $ 23,500 |  |  |  |  |  |  |  |  |  |  |  |
Increase in acquirer outstanding shares | 369,286 |  |  |  |  |  |  |  |  |  |  |  |
Acquisition Related Costs |  |  |  |  |  |  |  |  |  | 3,200 |  |  |
Loans acquired | $ 155,551 |  |  |  |  |  |  |  |  |  |  |  |
Combination of INDB and Island Bancorp, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition Related Costs |  |  |  |  |  |  |  |  |  | 2,600 |  |  |
New England Bancorp, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares of company stock issued for each share of Central common stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 0.25
Value of shares of company stock issued for each share of acquiree stock (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 15.14
Company's closing price per share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 60.55
Business transaction value |  |  |  |  |  |  |  |  |  |  |  |  | $ 41,700
Increase in acquirer outstanding shares |  |  |  |  |  |  |  |  |  |  |  |  | 672,665
Acquisition Related Costs |  |  |  |  |  |  |  |  |  | $ 5,000 |  |  |
Loans acquired |  |  |  |  |  |  |  |  |  |  |  |  | $ 225,731
Combination of INDB and New England Bancorp, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition Related Costs |  |  |  |  |  |  |  |  |  |  | $ 6,300 |  |

X
- Definition Business Acquisition, Cost of Acquired Entity, Percentage Cash Paid + References No definition available. + Details
Name: | indb_BusinessAcquisitionCostOfAcquiredEntityPercentageCashPaid
Namespace Prefix: | indb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Business Acquisition, Cost of Acquired Entity, Percentage Stock Consideration + References No definition available. + Details
Name: | indb_BusinessAcquisitionCostOfAcquiredEntityPercentageStockConsideration
Namespace Prefix: | indb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Business Acquisition, Equity Interest Issued or Issuable, Number of Shares of Company Stock Issued for Each Share of Acquiree Stock + References No definition available. + Details
Name: | indb_BusinessAcquisitionEquityInterestIssuedOrIssuableNumberOfSharesOfCompanyStockIssuedForEachShareOfAcquireeStock
Namespace Prefix: | indb_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Business Acquisition, Equity Interest Issued or Issuable, Per Share Value of Shares of Company Stock Issued for Each Share of Acquiree Stock + References No definition available. + Details
Name: | indb_BusinessAcquisitionEquityInterestIssuedOrIssuablePerShareValueOfSharesOfCompanyStockIssuedForEachShareOfAcquireeStock
Namespace Prefix: | indb_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Business Acquisition, Equity Interest Issued or Issuable Shareholders Option To Receive, Cash Per Share + References No definition available. + Details
Name: | indb_BusinessAcquisitionEquityInterestIssuedOrIssuableShareholdersOptionToReceiveCashPerShare
Namespace Prefix: | indb_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition. + References No definition available. + Details
Name: | indb_BusinessCombinationCostofAcquiredEntityPurchasePrice
Namespace Prefix: | indb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Business Combination, Increase in Acquirer Outstanding Shares + References No definition available. + Details
Name: | indb_BusinessCombinationIncreaseInAcquirerOutstandingShares
Namespace Prefix: | indb_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Net + References No definition available. + Details
Name: | indb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansNet
Namespace Prefix: | indb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
Name: | us-gaap_BusinessCombinationAcquisitionRelatedCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
Name: | us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquireBusinessesGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Price of a single share of a number of saleable stocks of a company. + References No definition available. + Details
Name: | us-gaap_SharePrice
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=indb_IslandBancorpInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=indb_CombinationofINDBandIslandBancorpInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=indb_NewEnglandBancorpInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=indb_CombinationofINDBandNewEnglandBancorpInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |