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v3.23.3

DERIVATIVES AND HEDGING ACTIVITIES - Risk Participation and Credit Risk Related Contingent Features (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Dec. 31, 2022 USD ($)
DERIVATIVES AND HEDGING ACTIVITIES |  |  |  |  |
Risk Participation Agreements, Liabilities, Notional Value | $ 94,000,000.0 |  | $ 94,000,000.0 |  | $ 71,100,000
Credit Risk Related Contingent Features [Abstract] |  |  |  |  |
Number of provisions breached | 0 | 0 | 0 | 0 |

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- References No definition available. + Details
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Namespace Prefix: | dcom_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Refers to the number of provisions of a derivative obligation agreement between the entity and a counterparty breached by the entity. + References No definition available. + Details
Name: | dcom_DerivativeObligationsAgreementProvisionsNumberBreached
Namespace Prefix: | dcom_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the notional value, at balance sheet date, of risk participation agreements not designated as hedges of derivative liabilities. + References No definition available. + Details
Name: | dcom_RiskParticipationAgreementsLiabilitiesNotionalValue
Namespace Prefix: | dcom_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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