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FHLBNY ADVANCES - Narrative (Details) - USD ($) | Dec. 31, 2022 | Dec. 31, 2021
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FHLBNY ADVANCES |  |
Borrowings total | $ 1,130,000,000 | $ 25,000,000,000.0
Average interest rate on outstanding FHLBNY | 4.55% | 0.35%
Borrowings | $ 4,130,000,000 | $ 4,190,000,000
Callable advances | 0 |
FHLBNY advances with an overnight contractual maturity | $ 0 |

X
- Definition Amount of overnight borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References No definition available. + Details
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X
- Definition Maximum amount of Federal Home Loan Bank (FHLBank) advances to member financial institutions. + References No definition available. + Details
Name: | dcom_FederalHomeLoanBankAdvancesMaximum
Namespace Prefix: | dcom_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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

X
- Definition Interest rate of advances made and reported by Federal Home Loan Bank (FHLBank). + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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