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Interest and Dividends Receivable - Summary of Interest and Dividends Receivable (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Receivables [Abstract] |  |
Interest and dividends receivable, Loans | $ 15,905 | $ 10,750
Interest and dividends receivable, Investment securities and other | 2,490 | 2,430
Interest and dividends receivable, Mortgage-backed securities | 1,294 | 1,074
Interest and dividends receivable | $ 19,689 | $ 14,254

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- Definition Interest and dividends receivable related to investment securities. + References No definition available. + Details
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Namespace Prefix: | ocfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Interest and dividends receivable related to loans. + References No definition available. + Details
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Namespace Prefix: | ocfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Interest and Dividends Receivable - Mortgage- backed securities + References No definition available. + Details
Name: | ocfc_InterestAndDividendsReceivableMortgageBackedSecurities
Namespace Prefix: | ocfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable. + 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 210.5-02.8) -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: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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