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PREMISES HELD FOR SALE (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
PREMISES HELD FOR SALE [Abstract]
Premises held for sale	$ 8,799	$ 0

Footnote disclosure related to premises classified as held for sale at period end.

No definition available.

Name:	dcom_PREMISESHELDFORSALEAbstract
Namespace Prefix:	dcom_
Data Type:	xbrli:stringItemType
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Period Type:	duration

Carrying amount of premises that has met all requisite criteria to be classified as held for sale

No definition available.

Name:	dcom_PremisesHeldForSale
Namespace Prefix:	dcom_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant