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Premises and Equipment, Net - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Property, Plant and Equipment [Abstract] |  |  |
Depreciation and amortization expense | $ 9.4 | $ 8.5 | $ 8.2

X
- Definition Depreciation, Depletion and Amortization, Net of Purchase Accounting Accretion and Amortization + References No definition available. + Details
Name: | ocfc_DepreciationDepletionandAmortizationNetofPurchaseAccountingAccretionandAmortization
Namespace Prefix: | ocfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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