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FHLBNY ADVANCES - Narrative (Details) - Federal Home Loan Bank of New York - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |
Borrowings total | $ 773.0 | $ 1,310.0
Borrowings | 1,760.0 | $ 1,190.0
Callable advances | $ 0.0 |

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- Definition Maximum amount of Federal Home Loan Bank (FHLBank) advances to member financial institutions. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Amount of federal home loan bank callable advances. + References No definition available. + Details
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Namespace Prefix: | dcom_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of Federal Home Loan Bank (FHLBank) advances to member financial institutions. + References No definition available. + Details
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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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