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v3.24.1.u1

BASIS OF PRESENTATION (Details) | 1 Months Ended | 3 Months Ended
--- | --- | ---
Sep. 30, 2021 subsidiary | Mar. 31, 2024 location
Number of real estate investments dissolved | subsidiary | 2 |
Number of branch locations | location |  | 60

X
- Definition Represents the number of real estate investments dissolved. + References No definition available. + Details
Name: | dcom_NumberOfRealEstateInvestmentsDissolved
Namespace Prefix: | dcom_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of full service retail banking offices at period end. + References No definition available. + Details
Name: | dcom_NumberOfRetailOffices
Namespace Prefix: | dcom_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration