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ACQUISITIONS (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
May 12, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Business Acquisition [Line Items] |  |  |  |  |
Acquisition Related Costs |  | $ 0 | $ 151 | $ 3,393 | $ 691
Island Bancorp, Inc. [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Equity Interest Issued or Issuable Shareholders Option To Receive, Cash Per Share | $ 500 |  |  |  |
Business Combination, Cost of Acquired Entity, Purchase Price | $ 28,300 |  |  |  |
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 |  |  |  |
Share Price | $ 63.55 |  |  |  |
Increase in acquirer outstanding shares | 369,286 |  |  |  |
Payments to Acquire Businesses, Gross | $ 4,800 |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable | $ 23,500 |  |  |  |
Business Acquisition, Cost of Acquired Entity, Percentage Cash Paid | 20.00% |  |  |  |
Business Acquisition, Cost of Acquired Entity, Percentage Stock Consideration | 80.00% |  |  |  |
Acquisition Related Costs |  |  |  | 3,200 |
Combination of INDB and Island Bancorp, Inc. [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquisition Related Costs |  | $ 0 | $ 0 | $ 2,600 |

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- 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
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- 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
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