ACQUISITIONS (Details Textual) (USD $)	0 Months Ended	3 Months Ended							12 Months Ended			0 Months Ended
	Nov. 09, 2012	Dec. 31, 2014	Sep. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Nov. 15, 2013
Business Acquisition [Line Items]
Acquisition Related Costs		$ 586,000	$ 677,000	$ 77,000	$ 6,219,000	$ 366,000	$ 754,000	$ 1,345,000	$ 1,339,000	$ 8,685,000	$ 6,741,000
Proceeds from sale of loans acquired in acquisition	42,200,000
Pay down of Federal Home Loan Bank Advances	25,000,000								(5,000,000)	(79,946,000)	(79,991,000)
Finite-lived intangible asset acquired, useful life									9 years 10 months 24 days
Business Combination, Pro Forma Information [Abstract]
Acquisition related costs net of tax, excluded from pro forma results									4,500,000	4,500,000
Acquisition related costs per share, diluted, excluded from pro forma results (in dollars per share)									$ 0.19	$ 0.20
Central Bankcorp, Inc. [Member]
Business Acquisition [Line Items]
Equity Interest Issued or Issuable Shareholders Option To Receive, Cash Per Share	$ 32.00
Number of shares of company stock issued for each share of Central common stock (in shares)	1.0533
Value of shares of company stock issued for each share of acquiree stock (in dollars per share)	$ 29.95
Company's closing price per share (in dollars per share)	$ 28.44
Business transaction value	52,000,000
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	21,600,000
Consideration Transferred, Equity Interests Issued and Issuable	30,400,000
Increase in acquirer outstanding shares	1,068,514
Acquisition Related Costs									1,800,000
Loans acquired	450,671,000
Interest income attributable to acquired loans									3,100,000
Mayflower Bankcorp, Inc. [Member]
Business Acquisition [Line Items]
Equity Interest Issued or Issuable Shareholders Option To Receive, Cash Per Share												$ 17.50
Number of shares of company stock issued for each share of Central common stock (in shares)												0.565
Value of shares of company stock issued for each share of acquiree stock (in dollars per share)												$ 20.28
Company's closing price per share (in dollars per share)												$ 35.90
Business transaction value												40,300,000
Cost of acquired entity, percentage cash												30.00%
Business Acquisition, Cost of Acquired Entity, Percentage Stock Consideration												70.00%
Cost of acquired entity, cash paid												10,900,000
Consideration Transferred, Equity Interests Issued and Issuable												29,400,000
Increase in acquirer outstanding shares												818,650
Acquisition Related Costs					6,700,000				6,900,000
Loans acquired												126,570,000
Interest income attributable to acquired loans		$ 641,000