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FAIR VALUE OF FINANCIAL INSTRUMENTS, Valuation Techniques (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value Asset Valuation Approach Broker Quotation Weighting (in hundredths) 10.00%dcom_FairValueAssetValuationApproachBrokerQuotationWeighting  
Fair Value Asset Valuation Approach Internal Cash Flow Valuation Model Weighting (in hundredths) 45.00%dcom_FairValueAssetValuationApproachInternalCashFlowValuationModelWeighting  
Fair Value Asset Valuation Approach Independent Cash Flow Valuation Model Weighting (in hundredths) 45.00%dcom_FairValueAssetValuationApproachIndependentCashFlowValuationModelWeighting  
Current Discount Rate Trust Preferred Valuation Minimum Value (in hundredths) 4.00%dcom_CurrentDiscountRateTrustPreferredValuationMinimumValue  
Current discount rate trust preferred valuation maximum value 10.00%dcom_CurrentDiscountRateTrustPreferredValuationMaximumValue  
Current discount trust preferred valuation weighted average rate- Pooled Trust Preferred Held To Maturity Securities (in hundredths) 5.80%dcom_CurrentDiscountRateTrustPreferredWeightedAverageRate  
Utilized default rates trust preferred valuation minimum value 0.00%dcom_UtilizedDefaultRatesTrustPreferredValuationMinimumValue  
Utilized default rates trust preferred valuation maximum value 7.80%dcom_UtilizedDefaultRatesTrustPreferredValuationMaximumValue  
Utilized default rates trust preferred valuation weighted average value 0.80%dcom_UtilizedDefaultRatesTrustPreferredValuationWeightedAverageValue  
Fair Value Inputs Standard Default Percentage Over Three Years (in hundredths) 1.20%dcom_FairValueInputsStandardDefaultRateDescription  
Fair Value Asset Valuation Approach Cash Flow Model Estimated Recovery Rate (in hundredths) 10.00%dcom_FairValueAssetValuationApproachCashFlowModelEstimatedRecoveryRate  
Outstanding Principal Balance Of Impaired Loans Measured At Fair Value $ 4,400dcom_OutstandingPrincipalBalanceOfImpairedLoansMeasuredAtFairValue $ 12,392dcom_OutstandingPrincipalBalanceOfImpairedLoansMeasuredAtFairValue
Recorded balance of impaired loans measured at fair value $ 0dcom_OutstandingPrincipalBalanceImpairedLoansMeasuredAtFairValue $ 1,320dcom_OutstandingPrincipalBalanceImpairedLoansMeasuredAtFairValue