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Commitments, Contingencies and Concentrations of Credit Risk - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Other Commitments [Line Items] |  |  |
Fixed-rate loan commitments | 90 days |  |
Rental expense | $ 5.2 | $ 3.2 | $ 3.1
Minimum |  |  |
Other Commitments [Line Items] |  |  |
Interest rates | 3.625% |  |
Maximum |  |  |
Other Commitments [Line Items] |  |  |
Interest rates | 7.50% |  |

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- Definition Fixed Rate Loan Commitments Expiration Period + References No definition available. + Details
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Balance Type: | na
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- Definition Fixed Rate Of Interest On Loans + References No definition available. + Details
Name: | ocfc_FixedRateOfInterestOnLoans
Namespace Prefix: | ocfc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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
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- Details
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Period Type: |

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