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ACQUISITIONS (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 16, 2018 | May 12, 2017 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition Related Costs |  |  | $ 8,046 | $ 2,688 | $ 434 | $ 0 | $ 0 | $ 2,909 | $ 484 | $ 11,168 | $ 3,393 | $ 5,455
Blue Hills Bancorp, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity Interest Issued or Issuable Shareholders Option To Receive, Cash Per Share |  |  | $ 5.25 |  |  |  |  |  |  | $ 5.25 |  |
Number of shares of company stock issued for each share of Central common stock (in shares) |  |  | 0.2308 |  |  |  |  |  |  | 0.2308 |  |
MNB Bancorp [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity Interest Issued or Issuable Shareholders Option To Receive, Cash Per Share | $ 275 |  |  |  |  |  |  |  |  |  |  |
Number of shares of company stock issued for each share of Central common stock (in shares) | 3.55 |  |  |  |  |  |  |  |  |  |  |
Value of shares of company stock issued for each share of acquiree stock (in dollars per share) | $ 285.38 |  |  |  |  |  |  |  |  |  |  |
Company's closing price per share (in dollars per share) | $ 80.39 |  |  |  |  |  |  |  |  |  |  |
Business transaction value | $ 56,100 |  |  |  |  |  |  |  |  |  |  |
Cost of acquired entity, percentage cash | 25.00% |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Cost of Acquired Entity, Percentage Stock Consideration | 75.00% |  |  |  |  |  |  |  |  |  |  |
Cost of acquired entity, cash paid | $ 13,600 |  |  |  |  |  |  |  |  |  |  |
Consideration Transferred, Equity Interests Issued and Issuable | $ 42,500 |  |  |  |  |  |  |  |  |  |  |
Increase in acquirer outstanding shares | 528,353 |  |  |  |  |  |  |  |  |  |  |
Acquisition Related Costs |  |  |  |  |  |  |  |  |  | $ 8,800 |  |
Loans acquired | $ 293,498 |  |  |  |  |  |  |  |  |  |  |
Combination of INDB and MNB Bancorp [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition Related Costs |  |  |  |  |  |  |  |  |  | $ 7,500 |  |
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 |

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