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COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Available lines of credit |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Fixed line of credit | $ 69,333 |
Variable line of credit | 981,726 | $ 210,660
Other loan commitments |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Fixed line of credit | 89,537 | 14,613
Variable line of credit | 136,553 | 68,286
Stand-by letters of credit |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Fixed line of credit | 34,852 | $ 8,610
Variable line of credit | $ 689 |

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: |