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COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Available lines of credit |  |
COMMITMENTS AND CONTINGENCIES |  |
Fixed line of credit | $ 195,714 | $ 114,880
Variable line of credit | 993,637 | 1,072,471
Other loan commitments |  |
COMMITMENTS AND CONTINGENCIES |  |
Fixed line of credit | 33,858 | 7,190
Variable line of credit | 43,975 | 89,855
Stand-by letters of credit |  |
COMMITMENTS AND CONTINGENCIES |  |
Fixed line of credit | $ 31,374 | $ 38,095

X
- Definition Amount of fixed line of credit. + References No definition available. + Details
Name: | dcom_LineOfCreditFixedValue
Namespace Prefix: | dcom_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of variable line of credit. + References No definition available. + Details
Name: | dcom_LineOfCreditVariableValue
Namespace Prefix: | dcom_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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_FairValueOffBalanceSheetRisksDisclosureInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_LineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=dcom_OtherLoanCommitmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_StandbyLettersOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |