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MERGER - Hypothetical Legacy Dime Ownership (Details) - Merger Agreement shares in Thousands | Jan. 31, 2021 shares
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MERGER |
Number of Legacy Dime Outstanding Shares | 63,620
Percentage Ownership | 100.00%
Bridge shareholders |
MERGER |
Number of Legacy Dime Outstanding Shares | 30,853
Percentage Ownership | 48.50%
Legacy Dime shareholders |
MERGER |
Number of Legacy Dime Outstanding Shares | 32,767
Percentage Ownership | 51.50%

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- Definition Number of shares of hypothetical equity interests issued or issuable to acquire entity. + References No definition available. + Details
Name: | dcom_BusinessAcquisitionHypotheticalEquityInterestsIssuedOrIssuable
Namespace Prefix: | dcom_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of hypothetical voting equity interests acquired at the acquisition date in the business combination. + References No definition available. + Details
Name: | dcom_BusinessAcquisitionHypotheticalPercentageOfVotingInterestsAcquired
Namespace Prefix: | dcom_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=dcom_MergerAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_OwnershipAxis=dcom_BridgeBancorpMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_OwnershipAxis=dcom_DimeCommunityBancsharesInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |