Document And Entity Information (USD $)	9 Months Ended
	Sep. 30, 2011	Jun. 30, 2010
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		$ 27,800,000
Entity Common Stock, Shares Outstanding	35,013,131
Document Fiscal Year Focus	2010
Document Fiscal Period Focus	Q3
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2011