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v3.23.3

Leases - Narrative (Details) | 9 Months Ended
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Sep. 30, 2023 renewalTerm lease
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