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ACQUISITIONS (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 20, 2015 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Nov. 10, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition Related Costs |  | $ 4,764 | $ 151 | $ 206 | $ 334 | $ 0 | $ 271 | $ 10,230 | $ 5,455 | $ 10,501 | $ 1,339 |
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 |  |  |
Peoples Federal Bancshares, Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity Interest Issued or Issuable Shareholders Option To Receive, Cash Per Share | $ 21.00 |  |  |  |  |  |  |  |  |  |  |
Number of shares of company stock issued for each share of Central common stock (in shares) | 0.5523 |  |  |  |  |  |  |  |  |  |  |
Value of shares of company stock issued for each share of acquiree stock (in dollars per share) | $ 23.26 |  |  |  |  |  |  |  |  |  |  |
Company's closing price per share (in dollars per share) | $ 42.11 |  |  |  |  |  |  |  |  |  |  |
Business transaction value | $ 141,800 |  |  |  |  |  |  |  |  |  |  |
Cost of acquired entity, percentage cash | 40.00% |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Cost of Acquired Entity, Percentage Stock Consideration | 60.00% |  |  |  |  |  |  |  |  |  |  |
Cost of acquired entity, cash paid | $ 55,400 |  |  |  |  |  |  |  |  |  |  |
Consideration Transferred, Equity Interests Issued and Issuable | $ 86,400 |  |  |  |  |  |  |  |  |  |  |
Increase in acquirer outstanding shares | 2,052,137 |  |  |  |  |  |  |  |  |  |  |
Acquisition Related Costs |  |  |  |  |  |  |  |  | $ 10,500 |  |  |
Loans acquired | $ 463,927 |  |  |  |  |  |  |  |  |  |  |
Combination of INDB and Peoples Federal Bancshares, Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition Related Costs |  |  |  |  |  |  |  |  |  | $ 16,700 |  |

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