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Borrowed Funds - Narrative (Details) - USD ($) | Mar. 31, 2024 | Dec. 31, 2023
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Debt Disclosure [Abstract] |  |
FHLB short-term advances | $ 608,600,000 | $ 848,600,000
FHLB advances overnight borrowing | 49,800,000 | 0
Other borrowings | $ 425,722,000 | $ 196,456,000

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- Definition Advance From Federal Home Loan Bank, Short-Term Advances + References No definition available. + Details
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Namespace Prefix: | ocfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Overnight Advances + References No definition available. + Details
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Namespace Prefix: | ocfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition The carrying amount as of the balance sheet date for the aggregate of other miscellaneous borrowings owed by the reporting entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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