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Business Combinations - Schedule of Merger Related Expenses (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Business Combinations [Abstract] |  |  |  |  |  |  |
Data processing fees |  |  |  |  | $ 3,758 | $ 2,514 | $ 6,017
Professional fees |  |  |  |  | 3,638 | 4,239 | 4,414
Employee severance payments |  |  |  |  | 7,727 | 2,942 | 15,660
Other/miscellaneous fees |  |  |  |  | 824 | 808 | 820
Merger related expenses | $ 1,194 | $ 3,156 | $ 3,070 | $ 8,527 | $ 15,947 | $ 10,503 | $ 26,911

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

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

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- Definition Business Combination, Miscellaneous Expenses + References No definition available. + Details
Name: | ocfc_BusinessCombinationMiscellaneousExpenses
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
Name: | ocfc_BusinessCombinationProfessionalFees
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 -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460 + Details
Name: | us-gaap_BusinessCombinationAcquisitionRelatedCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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