XML 65 R41.htm IDEA: XBRL DOCUMENT v2.4.1.9
INVESTMENT AND MORTGAGE-BACKED SECURITIES (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Investment Securities Held To Maturity [Abstract]    
Recorded Amortized / Historical Cost $ 5,326us-gaap_HeldToMaturitySecurities $ 5,367us-gaap_HeldToMaturitySecurities
Fair value of investment securities held to maturity 6,247us-gaap_HeldToMaturitySecuritiesFairValue 6,315us-gaap_HeldToMaturitySecuritiesFairValue
Pooled Trust Preferred Held To Maturity Securities TRUPS [Member]    
Investment Securities Held To Maturity [Abstract]    
Purchase Amortized / Historical Cost 15,589dcom_HeldToMaturitySecuritiesPurchaseCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_PooledTrustPreferredHeldToMaturitySecuritiesMember
15,815dcom_HeldToMaturitySecuritiesPurchaseCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_PooledTrustPreferredHeldToMaturitySecuritiesMember
Recorded Amortized / Historical Cost 5,326us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_PooledTrustPreferredHeldToMaturitySecuritiesMember
5,367us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_PooledTrustPreferredHeldToMaturitySecuritiesMember
Unrealized Gains 1,077us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_PooledTrustPreferredHeldToMaturitySecuritiesMember
1,119us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_PooledTrustPreferredHeldToMaturitySecuritiesMember
Unrealized Losses (156)us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_PooledTrustPreferredHeldToMaturitySecuritiesMember
(171)us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_PooledTrustPreferredHeldToMaturitySecuritiesMember
Fair value of investment securities held to maturity 6,247us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_PooledTrustPreferredHeldToMaturitySecuritiesMember
6,315us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_PooledTrustPreferredHeldToMaturitySecuritiesMember
Registered Mutual Funds Available For Sale [Member]    
Investment Securities Available For Sale [Abstract]    
Purchase Amortized / Historical Cost 3,868dcom_AvailableForSaleSecuritiesPurchaseCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_RegisteredMututalFundsMember
3,860dcom_AvailableForSaleSecuritiesPurchaseCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_RegisteredMututalFundsMember
Recorded Amortized/Historical Cost 3,868us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_RegisteredMututalFundsMember
[1] 3,860us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_RegisteredMututalFundsMember
[2]
Unrealized Gains 34us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_RegisteredMututalFundsMember
0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_RegisteredMututalFundsMember
Unrealized Losses (56)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_RegisteredMututalFundsMember
(124)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_RegisteredMututalFundsMember
Fair Value 3,846dcom_AvailableForSaleSecuritiesDebtFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_RegisteredMututalFundsMember
3,736dcom_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
Recorded Amortized/Historical Cost   70us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AgencySecuritiesMember
[2]
Unrealized Gains   0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AgencySecuritiesMember
Unrealized Losses   0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AgencySecuritiesMember
Fair Value   70dcom_AvailableForSaleSecuritiesDebtFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AgencySecuritiesMember
Pass Through MBS Issued by GSEs [Member]    
Investment Securities Available For Sale [Abstract]    
Purchase Amortized / Historical Cost 469dcom_AvailableForSaleSecuritiesPurchaseCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
24,154dcom_AvailableForSaleSecuritiesPurchaseCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Recorded Amortized/Historical Cost 469us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
[1] 24,154us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
[2]
Unrealized Gains 16us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
1,453us-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 485dcom_AvailableForSaleSecuritiesDebtFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
25,607dcom_AvailableForSaleSecuritiesDebtFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Private Issuer Pass Through MBS [Member]    
Investment Securities Available For Sale [Abstract]    
Purchase Amortized / Historical Cost   449dcom_AvailableForSaleSecuritiesPurchaseCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Recorded Amortized/Historical Cost   449us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
[2]
Unrealized Gains   6us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Unrealized Losses   0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Fair Value   455dcom_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
Recorded Amortized/Historical Cost   343us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_CollateralizedMortgageObligationsPrivateIssuerMember
[2]
Unrealized Gains   4us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_CollateralizedMortgageObligationsPrivateIssuerMember
Unrealized Losses   0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_CollateralizedMortgageObligationsPrivateIssuerMember
Fair Value   $ 347dcom_AvailableForSaleSecuritiesDebtFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= dcom_CollateralizedMortgageObligationsPrivateIssuerMember
[1] Amount represents the purchase amortized / historical cost less any OTTI charges (credit or non-credit related) previously recognized. For the TRUPS, amount is also net of the $908 unamortized portion of the unrealized loss that was recognized in accumulated other comprehensive loss on September 1, 2008 (the day on which these securities were transferred from available-for-sale to held-to-maturity).
[2] Amount represents the purchase amortized / historical cost less any OTTI charges (credit or non-credit related) previously recognized. For the TRUPS, amount is also net of the $932 unamortized portion of the unrealized loss that was recognized in accumulated other comprehensive loss on September 1, 2008 (the day on which these securities were transferred from available-for-sale to held-to-maturity).