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Commitments, Contingencies and Concentrations of Credit Risk - Summary of Commitments and Contingent Liabilities (Detail) $ in Thousands | Dec. 31, 2018 USD ($)
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Debt Instrument [Line Items] |
Fixed-Rate | $ 91,360
Adjustable-Rate | 4,732
Floating-Rate | 90,118
Unused consumer and construction loan lines of credit (primarily floating-rate) |
Debt Instrument [Line Items] |
Unused loan lines of credit (primarily floating-rate) | 326,990
Unused commercial loan lines of credit (primarily floating-rate) |
Debt Instrument [Line Items] |
Unused loan lines of credit (primarily floating-rate) | $ 406,954

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- 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

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- 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

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- 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

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- 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

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- 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=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |