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LOANS RECEIVABLE AND CREDIT QUALITY, Past Due Financing Receivbles (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Loan
Dec. 31, 2014
Loan
Financing Receivable, Recorded Investment, Aging [Abstract]    
Number Of Loans 90 Days or More Past Due And Still Accruing Pending Refinancing 3dcom_NumberOfLoans90DaysOrMorePastDueAndStillAccruingPendingRefinancing 8dcom_NumberOfLoans90DaysOrMorePastDueAndStillAccruingPendingRefinancing
Loans 90 Days or More Past Due And Still Accruing Pending Refinancing $ 1,711dcom_Loans90DaysOrMorePastDueAndStillAccruingPendingRefinancing $ 3,333dcom_Loans90DaysOrMorePastDueAndStillAccruingPendingRefinancing
One To Four Family Residential And Cooperative Unit Allowance [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due 47us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_OneToFourFamilyResidentialAndCooperativeUnitAllowanceMember
240us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_OneToFourFamilyResidentialAndCooperativeUnitAllowanceMember
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due 53us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_OneToFourFamilyResidentialAndCooperativeUnitAllowanceMember
0us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_OneToFourFamilyResidentialAndCooperativeUnitAllowanceMember
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_OneToFourFamilyResidentialAndCooperativeUnitAllowanceMember
0us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_OneToFourFamilyResidentialAndCooperativeUnitAllowanceMember
Non-accrual 1,141us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_OneToFourFamilyResidentialAndCooperativeUnitAllowanceMember
[1] 1,310us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_OneToFourFamilyResidentialAndCooperativeUnitAllowanceMember
[2]
Financing Receivable, Recorded Investment, Past Due, Total 1,241us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_OneToFourFamilyResidentialAndCooperativeUnitAllowanceMember
1,550us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_OneToFourFamilyResidentialAndCooperativeUnitAllowanceMember
Financing Receivable, Recorded Investment, Current 69,741us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_OneToFourFamilyResidentialAndCooperativeUnitAllowanceMember
71,950us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_OneToFourFamilyResidentialAndCooperativeUnitAllowanceMember
Loans and Leases Receivable, Other, Net of Deferred Income 70,982us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_OneToFourFamilyResidentialAndCooperativeUnitAllowanceMember
73,500us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_OneToFourFamilyResidentialAndCooperativeUnitAllowanceMember
Multifamily Residential and Residential Mixed Use [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due 0us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_MultifamilyResidentialAndResidentialMixedUseAllowanceMember
1,187us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_MultifamilyResidentialAndResidentialMixedUseAllowanceMember
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due 1,136us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_MultifamilyResidentialAndResidentialMixedUseAllowanceMember
0us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_MultifamilyResidentialAndResidentialMixedUseAllowanceMember
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 1,711us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_MultifamilyResidentialAndResidentialMixedUseAllowanceMember
2,922us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_MultifamilyResidentialAndResidentialMixedUseAllowanceMember
Non-accrual 537us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_MultifamilyResidentialAndResidentialMixedUseAllowanceMember
[1] 167us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_MultifamilyResidentialAndResidentialMixedUseAllowanceMember
[2]
Financing Receivable, Recorded Investment, Past Due, Total 3,384us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_MultifamilyResidentialAndResidentialMixedUseAllowanceMember
4,276us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_MultifamilyResidentialAndResidentialMixedUseAllowanceMember
Financing Receivable, Recorded Investment, Current 3,395,148us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_MultifamilyResidentialAndResidentialMixedUseAllowanceMember
3,294,172us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_MultifamilyResidentialAndResidentialMixedUseAllowanceMember
Loans and Leases Receivable, Other, Net of Deferred Income 3,398,532us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_MultifamilyResidentialAndResidentialMixedUseAllowanceMember
3,298,448us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_MultifamilyResidentialAndResidentialMixedUseAllowanceMember
Mixed Use Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due 0us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_MixedUseCommercialRealEstateAllowanceMember
0us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_MixedUseCommercialRealEstateAllowanceMember
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due 0us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_MixedUseCommercialRealEstateAllowanceMember
0us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_MixedUseCommercialRealEstateAllowanceMember
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_MixedUseCommercialRealEstateAllowanceMember
411us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_MixedUseCommercialRealEstateAllowanceMember
Non-accrual 0us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_MixedUseCommercialRealEstateAllowanceMember
[1] 0us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_MixedUseCommercialRealEstateAllowanceMember
[2]
Financing Receivable, Recorded Investment, Past Due, Total 0us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_MixedUseCommercialRealEstateAllowanceMember
411us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_MixedUseCommercialRealEstateAllowanceMember
Financing Receivable, Recorded Investment, Current 335,417us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_MixedUseCommercialRealEstateAllowanceMember
328,256us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_MixedUseCommercialRealEstateAllowanceMember
Loans and Leases Receivable, Other, Net of Deferred Income 335,417us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_MixedUseCommercialRealEstateAllowanceMember
328,667us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_MixedUseCommercialRealEstateAllowanceMember
Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due 0us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
0us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due 0us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
0us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
0us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
Non-accrual 4,717us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
[1] 4,717us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
[2]
Financing Receivable, Recorded Investment, Past Due, Total 4,717us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
4,717us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
Financing Receivable, Recorded Investment, Current 423,457us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
412,079us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
Loans and Leases Receivable, Other, Net of Deferred Income 428,174us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
416,796us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
Construction Loan Receivable [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due 0us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_ConstructionLoanReceivableMember
0us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_ConstructionLoanReceivableMember
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due 0us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_ConstructionLoanReceivableMember
0us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_ConstructionLoanReceivableMember
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_ConstructionLoanReceivableMember
0us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_ConstructionLoanReceivableMember
Non-accrual 0us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_ConstructionLoanReceivableMember
[1] 0us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_ConstructionLoanReceivableMember
[2]
Financing Receivable, Recorded Investment, Past Due, Total 0us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_ConstructionLoanReceivableMember
0us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_ConstructionLoanReceivableMember
Financing Receivable, Recorded Investment, Current 0us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_ConstructionLoanReceivableMember
0us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_ConstructionLoanReceivableMember
Loans and Leases Receivable, Other, Net of Deferred Income 0us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_ConstructionLoanReceivableMember
0us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_ConstructionLoanReceivableMember
Consumer Loan [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due 3us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
2us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due 0us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
0us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
0us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
Non-accrual 4us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
[1] 4us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
[2]
Financing Receivable, Recorded Investment, Past Due, Total 7us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
6us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
Financing Receivable, Recorded Investment, Current 1,605us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
1,823us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
Loans and Leases Receivable, Other, Net of Deferred Income 1,612us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
1,829us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
Total Real Estate Loans [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due 47us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_TotalRealEstateAndLoansHeldForSaleReceivableMember
1,427us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_TotalRealEstateAndLoansHeldForSaleReceivableMember
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due 1,189us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_TotalRealEstateAndLoansHeldForSaleReceivableMember
0us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_TotalRealEstateAndLoansHeldForSaleReceivableMember
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 1,711us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_TotalRealEstateAndLoansHeldForSaleReceivableMember
3,333us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_TotalRealEstateAndLoansHeldForSaleReceivableMember
Non-accrual 6,395us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_TotalRealEstateAndLoansHeldForSaleReceivableMember
[1] 6,194us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_TotalRealEstateAndLoansHeldForSaleReceivableMember
[2]
Financing Receivable, Recorded Investment, Past Due, Total 9,342us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_TotalRealEstateAndLoansHeldForSaleReceivableMember
10,954us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_TotalRealEstateAndLoansHeldForSaleReceivableMember
Financing Receivable, Recorded Investment, Current 4,223,763us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_TotalRealEstateAndLoansHeldForSaleReceivableMember
4,106,457us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_TotalRealEstateAndLoansHeldForSaleReceivableMember
Loans and Leases Receivable, Other, Net of Deferred Income $ 4,233,105us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_TotalRealEstateAndLoansHeldForSaleReceivableMember
$ 4,117,411us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= dcom_TotalRealEstateAndLoansHeldForSaleReceivableMember
[1] Includes all loans on non-accrual status regardless of the number of days such loans were delinquent as of March 31, 2015.
[2] Includes all loans on non-accrual status regardless of the number of days such loans were delinquent as of December 31, 2014.