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FAIR VALUE OF FINANCIAL INSTRUMENTS, Quantitative Information (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Income Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Assets, Fair Value Disclosure $ 4,400us-gaap_AssetsFairValueDisclosure
/ us-gaap_ValuationTechniqueAxis
= us-gaap_IncomeApproachValuationTechniqueMember		 $ 4,607us-gaap_AssetsFairValueDisclosure
/ us-gaap_ValuationTechniqueAxis
= us-gaap_IncomeApproachValuationTechniqueMember
Fair Value Inputs, Cap Rate    [1]    [1]
Fair Value Inputs Reduction Planned Expedited Disposal    [1]    [1]
Market Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Assets, Fair Value Disclosure   802us-gaap_AssetsFairValueDisclosure
/ us-gaap_ValuationTechniqueAxis
= us-gaap_MarketApproachValuationTechniqueMember
Fair Value from Previously Negotiated Note Sales [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Assets, Fair Value Disclosure   $ 5,500us-gaap_AssetsFairValueDisclosure
/ us-gaap_ValuationTechniqueAxis
= dcom_FairValueFromPreviouslyNegotiatedNoteSalesMember
Discount to unpaid principal balance from likely realizable value of a note sale negotiated on terms deemed acceptable      [1]
Minimum [Member] | Income Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Cap Rate    [1]    [1]
Fair Value Inputs Reduction Planned Expedited Disposal    [1]    [1]
Minimum [Member] | Market Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Cap Rate   7.80%us-gaap_FairValueInputsCapRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_MarketApproachValuationTechniqueMember
Fair Value Inputs Reduction Sales Comparison Value   0.00%dcom_FairValueInputsReductionSalesComparisonValue
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_MarketApproachValuationTechniqueMember
Fair Value Inputs Reduction Planned Expedited Disposal   20.00%dcom_FairValueInputsReductionPlannedExpeditedDisposal
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_MarketApproachValuationTechniqueMember
Minimum [Member] | Fair Value from Previously Negotiated Note Sales [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Discount to unpaid principal balance from likely realizable value of a note sale negotiated on terms deemed acceptable      [1]
Maximum [Member] | Market Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Cap Rate   8.50%us-gaap_FairValueInputsCapRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_MarketApproachValuationTechniqueMember
Fair Value Inputs Reduction Sales Comparison Value   15.00%dcom_FairValueInputsReductionSalesComparisonValue
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_MarketApproachValuationTechniqueMember
Fair Value Inputs Reduction Planned Expedited Disposal   30.00%dcom_FairValueInputsReductionPlannedExpeditedDisposal
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_MarketApproachValuationTechniqueMember
Weighted Average [Member] | Income Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Cap Rate 7.50%us-gaap_FairValueInputsCapRate
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_IncomeApproachValuationTechniqueMember		 7.50%us-gaap_FairValueInputsCapRate
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_IncomeApproachValuationTechniqueMember
Fair Value Inputs Reduction Planned Expedited Disposal   0.40%dcom_FairValueInputsReductionPlannedExpeditedDisposal
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_IncomeApproachValuationTechniqueMember
Weighted Average [Member] | Market Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Cap Rate   8.30%us-gaap_FairValueInputsCapRate
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_MarketApproachValuationTechniqueMember
Fair Value Inputs Reduction Sales Comparison Value   5.00%dcom_FairValueInputsReductionSalesComparisonValue
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_MarketApproachValuationTechniqueMember
Fair Value Inputs Reduction Planned Expedited Disposal   26.00%dcom_FairValueInputsReductionPlannedExpeditedDisposal
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_MarketApproachValuationTechniqueMember
Weighted Average [Member] | Fair Value from Previously Negotiated Note Sales [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Discount to unpaid principal balance from likely realizable value of a note sale negotiated on terms deemed acceptable   17.00%dcom_DiscountToUnpaidPrincipalBalanceFromLikelyRealizableValueOfNoteSaleNegotiatedOnTermsDeemedAcceptable
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
/ us-gaap_ValuationTechniqueAxis
= dcom_FairValueFromPreviouslyNegotiatedNoteSalesMember
[1] Only one loan in population.