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Business Combinations - Schedule of Merger Related Expenses (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract] |  |  |
Data processing fees | $ 0 | $ 10 | $ 790
Professional fees | 1,506 | 12 | 1,936
Other/miscellaneous fees | 273 | 0 | 9
Merger related expenses | $ 1,779 | $ 22 | $ 2,735

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- Definition Business Combination, IT Expenses + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Business Combination, Miscellaneous Expenses + References No definition available. + Details
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Namespace Prefix: | ocfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Business Combination, Professional Fees + References No definition available. + Details
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Namespace Prefix: | ocfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479405/805-10-25-23 + Details
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Balance Type: | debit
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- References No definition available. + Details
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