Document and Entity Information - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Aug. 06, 2015
Document and Entity Information [Abstract]
Entity Registrant Name	DIME COMMUNITY BANCSHARES INC
Entity Central Index Key	0001005409
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	No
Entity Filer Category	Accelerated Filer
Entity Public Float	$ 517.4
Entity Common Stock, Shares Outstanding		37,189,352
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q2
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2015