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LOANS HELD FOR INVESTMENT, NET - Additional Information (Details) - item	Sep. 30, 2024	Sep. 30, 2023
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