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v3.20.4

Leases - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2020 lease
Leases [Abstract] |
Number of finance leases (leases) | 1

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

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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