ACQUISITIONS (Details Textual) - USD ($)		3 Months Ended		6 Months Ended
	Feb. 20, 2015	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Business Acquisition [Line Items]
Acquisition Related Costs		$ 271,000	$ 0	$ 10,501,000	$ 77,000
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	$ 141,800,000
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	$ 55,400,000
Consideration Transferred, Equity Interests Issued and Issuable	$ 86,400,000
Increase in acquirer outstanding shares	2,052,137
Acquisition Related Costs		271,000,000		10,500,000
Loans acquired	$ 463,927,000
Combination of INDB and Peoples Federal Bancshares, Inc [Member]
Business Acquisition [Line Items]
Acquisition Related Costs		$ 271,000		$ 16,700,000