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REGULATORY CAPITAL MATTERS (Details) | 12 Months Ended
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Dec. 31, 2022
Basel III |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |
Additional capital conservation buffer (as a percentage) | 0.025%

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- Definition Percentage of additional capital conservation buffer. + References No definition available. + Details
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Namespace Prefix: | dcom_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RegulatoryAgencyAxis=dcom_BaselIiiMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |