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EMPLOYEE BENEFIT PLANS, STOCK OPTIONS BY EXERCISE PRICE RANGE (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]  
Outstanding Options, Amount ( in shares) 979,916us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
Outstanding Options, Weighted Average Remaining Contractual Years Remaining 2 years 4 months 24 days
Vested Options, Amount ( in shares) 960,641us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
Vested Options, Weighted Average Contractual Years Remaining 2 years 3 months 18 days
Exercise Price $8.34 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]  
Outstanding Options, Exercise Prices (in dollars per share) 8.34us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= dcom_ExercisePrice834Member
Outstanding Options, Amount ( in shares) 24,582us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= dcom_ExercisePrice834Member
Outstanding Options, Weighted Average Remaining Contractual Years Remaining 4 years 3 months 18 days
Vested Options, Amount ( in shares) 24,582us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= dcom_ExercisePrice834Member
Vested Options, Weighted Average Contractual Years Remaining 4 years 3 months 18 days
Exercise Price $12.75 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]  
Outstanding Options, Exercise Prices (in dollars per share) 12.75us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= dcom_ExercisePrice1275Member
Outstanding Options, Amount ( in shares) 39,589us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= dcom_ExercisePrice1275Member
Outstanding Options, Weighted Average Remaining Contractual Years Remaining 5 years 3 months 18 days
Vested Options, Amount ( in shares) 39,589us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= dcom_ExercisePrice1275Member
Vested Options, Weighted Average Contractual Years Remaining 5 years 3 months 18 days
Exercise Price $13.74 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]  
Outstanding Options, Exercise Prices (in dollars per share) 13.74us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= dcom_ExercisePrice1374Member
Outstanding Options, Amount ( in shares) 370,062us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= dcom_ExercisePrice1374Member
Outstanding Options, Weighted Average Remaining Contractual Years Remaining 2 years 3 months 18 days
Vested Options, Amount ( in shares) 370,062us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= dcom_ExercisePrice1374Member
Vested Options, Weighted Average Contractual Years Remaining 2 years 3 months 18 days
Exercise Price $13.86 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]  
Outstanding Options, Exercise Prices (in dollars per share) 13.86us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= dcom_ExercisePrice1386Member
Outstanding Options, Amount ( in shares) 17,108us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= dcom_ExercisePrice1386Member
Outstanding Options, Weighted Average Remaining Contractual Years Remaining 7 years 3 months 18 days
Vested Options, Amount ( in shares) 17,108us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= dcom_ExercisePrice1386Member
Vested Options, Weighted Average Contractual Years Remaining 7 years 3 months 18 days
Exercise Price $15.10 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]  
Outstanding Options, Exercise Prices (in dollars per share) 15.10us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= dcom_ExercisePrice1510Member
Outstanding Options, Amount ( in shares) 257,579us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= dcom_ExercisePrice1510Member
Outstanding Options, Weighted Average Remaining Contractual Years Remaining 0 years 4 months 24 days
Vested Options, Amount ( in shares) 257,579us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= dcom_ExercisePrice1510Member
Vested Options, Weighted Average Contractual Years Remaining 0 years 4 months 24 days
Exercise Price $15.46 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]  
Outstanding Options, Exercise Prices (in dollars per share) 15.46us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= dcom_ExercisePrice1546Member
Outstanding Options, Amount ( in shares) 85,183us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= dcom_ExercisePrice1546Member
Outstanding Options, Weighted Average Remaining Contractual Years Remaining 6 years 3 months 18 days
Vested Options, Amount ( in shares) 65,908us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= dcom_ExercisePrice1546Member
Vested Options, Weighted Average Contractual Years Remaining 6 years 3 months 18 days
Exercise Price $16.45 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]  
Outstanding Options, Exercise Prices (in dollars per share) 16.45us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= dcom_ExercisePrice1645Member
Outstanding Options, Amount ( in shares) 59,360us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= dcom_ExercisePrice1645Member
Outstanding Options, Weighted Average Remaining Contractual Years Remaining 0 years 1 month 6 days
Vested Options, Amount ( in shares) 59,360us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= dcom_ExercisePrice1645Member
Vested Options, Weighted Average Contractual Years Remaining 0 years 1 month 6 days
Exercise Price $16.73 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]  
Outstanding Options, Exercise Prices (in dollars per share) 16.73us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= dcom_ExercisePrice1673Member
Outstanding Options, Amount ( in shares) 46,453us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= dcom_ExercisePrice1673Member
Outstanding Options, Weighted Average Remaining Contractual Years Remaining 3 years 7 months 6 days
Vested Options, Amount ( in shares) 46,453us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= dcom_ExercisePrice1673Member
Vested Options, Weighted Average Contractual Years Remaining 3 years 7 months 6 days
Exercise Price $18.18 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]  
Outstanding Options, Exercise Prices (in dollars per share) 18.18us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= dcom_ExercisePrice1818Member
Outstanding Options, Amount ( in shares) 80,000us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= dcom_ExercisePrice1818Member
Outstanding Options, Weighted Average Remaining Contractual Years Remaining 3 years 4 months 24 days
Vested Options, Amount ( in shares) 80,000us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= dcom_ExercisePrice1818Member
Vested Options, Weighted Average Contractual Years Remaining 3 years 4 months 24 days