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Leases - Narrative (Details)	9 Months Ended
	Sep. 30, 2024 lease renewalTerm
Leases [Abstract]
Number of finance leases | lease	1
Number of option to renew | renewalTerm	1

X

- Definition

Lease, Number Of Option To Renew

+ References

No definition available.

+ Details

Name:	ocfc_LeaseNumberOfOptionToRenew
Namespace Prefix:	ocfc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number Of Finance Leases

+ References

No definition available.

+ Details

Name:	ocfc_NumberOfFinanceLeases
Namespace Prefix:	ocfc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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