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LOANS HELD FOR INVESTMENT, NET - Additional Information (Details) - item | Sep. 30, 2024 | Sep. 30, 2023
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LOANS HELD FOR INVESTMENT, NET |  |
Number of loans | 0 | 0

X
- Definition The number of loans receivables outstanding more. + References No definition available. + Details
Name: | dcom_FinancialReceivablesNumberOfLoansOutstanding
Namespace Prefix: | dcom_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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