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FAIR VALUE OF FINANCIAL INSTRUMENTS, Quantitative Information (Details) (Impaired Loans [Member], Income Approach Valuation Technique [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2013
Dec. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Assets, Fair Value Disclosure 4,400us-gaap_AssetsFairValueDisclosure   $ 4,400us-gaap_AssetsFairValueDisclosure
Weighted Average [Member]
     
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value Inputs, Cap Rate 7.50%us-gaap_FairValueInputsCapRate
/ us-gaap_FairValueByAssetClassAxis
= dcom_ImpairedLoansMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_IncomeApproachValuationTechniqueMember
7.50%us-gaap_FairValueInputsCapRate
/ us-gaap_FairValueByAssetClassAxis
= dcom_ImpairedLoansMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_IncomeApproachValuationTechniqueMember