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BASIS OF PRESENTATION (Details)	6 Months Ended
	Jun. 30, 2025 location
BASIS OF PRESENTATION
Number of branch locations	62

X

- Definition

The number of full service retail banking offices at period end.

+ References

No definition available.

+ Details

Name:	dcom_NumberOfRetailOffices
Namespace Prefix:	dcom_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration