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Commitments, Contingencies and Concentrations of Credit Risk - Summary of Commitments and Contingent Liabilities (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Fixed-rate	$ 234,608
Adjustable-rate	2,750
Floating-rate	130,448
Unused consumer and construction loan lines of credit (primarily floating-rate)
Debt Instrument [Line Items]
Unused loan lines of credit (primarily floating-rate)	372,159
Unused commercial loan lines of credit (primarily floating-rate)
Debt Instrument [Line Items]
Unused loan lines of credit (primarily floating-rate)	$ 668,114

X

- Definition

Other Commitments To Extend Credit At Adjustable Rate

+ References

No definition available.

+ Details

Name:	ocfc_OtherCommitmentsToExtendCreditAtAdjustableRate
Namespace Prefix:	ocfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Other Commitments To Extend Credit At Fixed Rate

+ References

No definition available.

+ Details

Name:	ocfc_OtherCommitmentsToExtendCreditAtFixedRate
Namespace Prefix:	ocfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Other Commitments To Extend Credit At Floating Rate

+ References

No definition available.

+ Details

Name:	ocfc_OtherCommitmentsToExtendCreditAtFloatingRate
Namespace Prefix:	ocfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=ocfc_ConsumerAndConstructionLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CommercialLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: