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v3.21.1

Leases - Narrative (Details) | 3 Months Ended
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Mar. 31, 2021 lease
Leases [Abstract] |
Number of finance leases | 1

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- 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

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