ACQUISITIONS (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended							12 Months Ended
	Feb. 20, 2015	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Acquisition Related Costs		$ 0	$ 0	$ 271	$ 10,230	$ 586	$ 677	$ 77	$ 10,501	$ 1,339	$ 8,685
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