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v3.20.4

NET FRAUD LOSS (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($)
NET FRAUD LOSS |
Net fraud loss | $ 8,900

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- Definition n/a + References No definition available. + Details
Name: | dcom_FraudLossAbstract
Namespace Prefix: | dcom_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents non-interest expense items related to fraud loss. + References No definition available. + Details
Name: | dcom_NoninterestExpenseFraudLoss
Namespace Prefix: | dcom_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration