Parent-Only Financial Information - Condensed Statements of Financial Condition (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Assets
Cash and due from banks	$ 36,117us-gaap_CashAndDueFromBanks	$ 33,958us-gaap_CashAndDueFromBanks	$ 62,544us-gaap_CashAndDueFromBanks	$ 77,527us-gaap_CashAndDueFromBanks
Investment securities	19,804us-gaap_AvailableForSaleSecurities	43,836us-gaap_AvailableForSaleSecurities
Other assets	11,913us-gaap_OtherAssets	12,043us-gaap_OtherAssets
Total assets	2,356,714us-gaap_Assets	2,249,711us-gaap_Assets
Liabilities and Stockholders' Equity
Borrowings	400,550us-gaap_DebtAndCapitalLeaseObligations	270,804us-gaap_DebtAndCapitalLeaseObligations
Other liabilities	11,447us-gaap_OtherLiabilities	11,323us-gaap_OtherLiabilities
Stockholders' equity	218,259us-gaap_StockholdersEquity	214,350us-gaap_StockholdersEquity	219,792us-gaap_StockholdersEquity	216,849us-gaap_StockholdersEquity
Total liabilities and stockholders' equity	2,356,714	2,249,711
OceanFirst Financial Corp. [Member]
Assets
Cash and due from banks	7	7
Advances to subsidiary Bank	22,776	16,753
Investment securities		8,547
ESOP loan receivable	3,707	3,897
Investment in subsidiary Bank	219,221	212,957
Other assets	229	568
Total assets	245,940	242,729
Liabilities and Stockholders' Equity
Borrowings	27,500	27,500
Other liabilities	181	879
Stockholders' equity	218,259	214,350
Total liabilities and stockholders' equity	$ 245,940	$ 242,729

Advances To Bank Subsidiaries

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Esop Loan Receivable

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.

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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

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Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.

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