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INVESTMENT AND MORTGAGE-BACKED SECURITIES (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Investment Securities Held To Maturity [Abstract]      
Federal funds sold and other short-term investments $ 2,165us-gaap_OtherInterestAndDividendIncome $ 1,845us-gaap_OtherInterestAndDividendIncome $ 2,413us-gaap_OtherInterestAndDividendIncome
Bank Owned Life Insurance 82,614us-gaap_BankOwnedLifeInsurance 55,871us-gaap_BankOwnedLifeInsurance  
Book Value 5,367us-gaap_HeldToMaturitySecurities 5,341us-gaap_HeldToMaturitySecurities  
Fair value of investment securities held to maturity 6,315us-gaap_HeldToMaturitySecuritiesFairValue 5,163us-gaap_HeldToMaturitySecuritiesFairValue  
Investment Securities Available For Sale [Abstract]      
Fair Value 70dcom_AvailableForSaleSecuritiesDebtFairValue    
Pooled Trust Preferred Held To Maturity Securities TRUPS [Member]      
Investment Securities Available For Sale [Abstract]      
Purchase Amortized / Historical Cost 15,815dcom_AvailableForSaleSecuritiesPurchaseCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_PooledTrustPreferredHeldToMaturitySecuritiesMember
15,885dcom_AvailableForSaleSecuritiesPurchaseCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_PooledTrustPreferredHeldToMaturitySecuritiesMember
 
Recorded Amortized/Historical Cost 5,367us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_PooledTrustPreferredHeldToMaturitySecuritiesMember
5,341us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_PooledTrustPreferredHeldToMaturitySecuritiesMember
 
Unrealized Gains 1,119us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_PooledTrustPreferredHeldToMaturitySecuritiesMember
118us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_PooledTrustPreferredHeldToMaturitySecuritiesMember
 
Unrealized Losses (171)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_PooledTrustPreferredHeldToMaturitySecuritiesMember
(296)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_PooledTrustPreferredHeldToMaturitySecuritiesMember
 
Fair Value 6,315dcom_AvailableForSaleSecuritiesDebtFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_PooledTrustPreferredHeldToMaturitySecuritiesMember
5,163dcom_AvailableForSaleSecuritiesDebtFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_PooledTrustPreferredHeldToMaturitySecuritiesMember
 
Registered Mutual Funds Available For Sale [Member]      
Investment Securities Available For Sale [Abstract]      
Purchase Amortized / Historical Cost 3,860dcom_AvailableForSaleSecuritiesPurchaseCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_RegisteredMututalFundsMember
2,866dcom_AvailableForSaleSecuritiesPurchaseCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_RegisteredMututalFundsMember
 
Recorded Amortized/Historical Cost 3,860us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_RegisteredMututalFundsMember
2,760us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_RegisteredMututalFundsMember
 
Unrealized Gains 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_RegisteredMututalFundsMember
815us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_RegisteredMututalFundsMember
 
Unrealized Losses (124)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_RegisteredMututalFundsMember
(17)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_RegisteredMututalFundsMember
 
Fair Value 3,736dcom_AvailableForSaleSecuritiesDebtFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_RegisteredMututalFundsMember
3,558dcom_AvailableForSaleSecuritiesDebtFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_RegisteredMututalFundsMember
 
Agency Notes [Member]      
Investment Securities Available For Sale [Abstract]      
Purchase Amortized / Historical Cost 70dcom_AvailableForSaleSecuritiesPurchaseCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AgencySecuritiesMember
15,070dcom_AvailableForSaleSecuritiesPurchaseCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AgencySecuritiesMember
 
Recorded Amortized/Historical Cost 70us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AgencySecuritiesMember
15,070us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AgencySecuritiesMember
 
Unrealized Gains 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AgencySecuritiesMember
21us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AgencySecuritiesMember
 
Unrealized Losses 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AgencySecuritiesMember
0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AgencySecuritiesMember
 
Fair Value 70dcom_AvailableForSaleSecuritiesDebtFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AgencySecuritiesMember
15,091dcom_AvailableForSaleSecuritiesDebtFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AgencySecuritiesMember
 
Pass Through MBS Issued by GSEs [Member]      
Investment Securities Available For Sale [Abstract]      
Purchase Amortized / Historical Cost 24,154dcom_AvailableForSaleSecuritiesPurchaseCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
28,407dcom_AvailableForSaleSecuritiesPurchaseCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
 
Recorded Amortized/Historical Cost 24,154us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
28,407us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
 
Unrealized Gains 1,453us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
1,552us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
 
Unrealized Losses 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
 
Fair Value 25,607dcom_AvailableForSaleSecuritiesDebtFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
29,959dcom_AvailableForSaleSecuritiesDebtFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
 
Collateralized Mortgage Obligations Issued By GSEs [Member]      
Investment Securities Available For Sale [Abstract]      
Purchase Amortized / Historical Cost   319dcom_AvailableForSaleSecuritiesPurchaseCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_CollateralizedMortgageObligationsGovernmentIssuerMember
 
Recorded Amortized/Historical Cost   319us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_CollateralizedMortgageObligationsGovernmentIssuerMember
 
Unrealized Gains   2us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_CollateralizedMortgageObligationsGovernmentIssuerMember
 
Unrealized Losses   0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_CollateralizedMortgageObligationsGovernmentIssuerMember
 
Fair Value   321dcom_AvailableForSaleSecuritiesDebtFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_CollateralizedMortgageObligationsGovernmentIssuerMember
 
Private Issuer Pass Through MBS [Member]      
Investment Securities Available For Sale [Abstract]      
Purchase Amortized / Historical Cost 449dcom_AvailableForSaleSecuritiesPurchaseCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
662dcom_AvailableForSaleSecuritiesPurchaseCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
 
Recorded Amortized/Historical Cost 449us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
662us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
 
Unrealized Gains 6us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
18us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
 
Unrealized Losses 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
 
Fair Value 455dcom_AvailableForSaleSecuritiesDebtFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
680dcom_AvailableForSaleSecuritiesDebtFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
 
Private Issuer CMOs [Member]      
Investment Securities Available For Sale [Abstract]      
Purchase Amortized / Historical Cost 343dcom_AvailableForSaleSecuritiesPurchaseCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_CollateralizedMortgageObligationsPrivateIssuerMember
574dcom_AvailableForSaleSecuritiesPurchaseCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_CollateralizedMortgageObligationsPrivateIssuerMember
 
Recorded Amortized/Historical Cost 343us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_CollateralizedMortgageObligationsPrivateIssuerMember
574us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_CollateralizedMortgageObligationsPrivateIssuerMember
 
Unrealized Gains 4us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_CollateralizedMortgageObligationsPrivateIssuerMember
9us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_CollateralizedMortgageObligationsPrivateIssuerMember
 
Unrealized Losses 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_CollateralizedMortgageObligationsPrivateIssuerMember
0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_CollateralizedMortgageObligationsPrivateIssuerMember
 
Fair Value $ 347dcom_AvailableForSaleSecuritiesDebtFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_CollateralizedMortgageObligationsPrivateIssuerMember
$ 583dcom_AvailableForSaleSecuritiesDebtFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_CollateralizedMortgageObligationsPrivateIssuerMember