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v3.21.2

LEASES - Narrative (Details) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 USD ($) lease item | Feb. 01, 2021 USD ($)
LEASES |  |
Operating lease assets |  | $ 45.6
Operating lease liabilities |  | $ 45.3
Number of leases terminated | lease | 3 |
Number of branches combined to other locations | item | 3 |
Decrease in operating lease liability | $ (3.7) |
Early termination fee | $ 4.0 |

X
- Definition Amount of operating lease assets acquired at the acquisition date. + References No definition available. + Details
Name: | dcom_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseAssets
Namespace Prefix: | dcom_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of operating lease liabilities assumed in business combination. + References No definition available. + Details
Name: | dcom_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseLiabilities
Namespace Prefix: | dcom_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of increase (decrease) in obligation for operating lease. + References No definition available. + Details
Name: | dcom_IncreaseDecreaseInOperatingLeaseLiability
Namespace Prefix: | dcom_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The number of branches that is combined to other locations. + References No definition available. + Details
Name: | dcom_NumberOfBranchesCombinedToOtherLocations
Namespace Prefix: | dcom_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of leases terminated. + References No definition available. + Details
Name: | dcom_NumberOfLeasesTerminated
Namespace Prefix: | dcom_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of early termination fees. + References No definition available. + Details
Name: | dcom_OperatingLeaseEarlyTerminationFees
Namespace Prefix: | dcom_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration