Additional Common Stock Issued Shares

No definition available.

Name:	ocfc_AdditionalCommonStockIssuedShares
Namespace Prefix:	ocfc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Employee Minimum Age Eligibility To Participate In Plan

+ References

No definition available.

+ Details

Name:	ocfc_EmployeeMinimumAgeEligibilityToParticipateInPlan
Namespace Prefix:	ocfc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Employee Stock Ownership Plan Esop Debt Structure Direct Loan Interest Percentage

+ References

No definition available.

+ Details

Name:	ocfc_EmployeeStockOwnershipPlanEsopDebtStructureDirectLoanInterestPercentage
Namespace Prefix:	ocfc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Employee Stock Ownership Plan (ESOP), Number of Unallocated Shares

+ References

No definition available.

+ Details

Name:	ocfc_EmployeeStockOwnershipPlanESOPNumberOfUnallocatedShares
Namespace Prefix:	ocfc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Employee Stock Ownership Plan ESOP Shares Contributed to ESOP Value

+ References

No definition available.

+ Details

Name:	ocfc_EmployeeStockOwnershipPlanESOPSharesContributedToESOPValue
Namespace Prefix:	ocfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Esop Working Hours During Plan

+ References

No definition available.

+ Details

Name:	ocfc_EsopWorkingHoursDuringPlan
Namespace Prefix:	ocfc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Original Term Loan Borrowing

+ References

No definition available.

+ Details

Name:	ocfc_OriginalTermLoanBorrowing
Namespace Prefix:	ocfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Share Based Compensation Arrangement By Share Based Payment Award Expiration Year

+ References

No definition available.

+ Details

Name:	ocfc_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpirationYear
Namespace Prefix:	ocfc_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

- Definition

Share Based Compensation Expense Related To Increase In Fair Value

+ References

No definition available.

+ Details

Name:	ocfc_ShareBasedCompensationExpenseRelatedToIncreaseInFairValue
Namespace Prefix:	ocfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Shares To Be Purchased For Esop From Borrowed Fund

+ References

No definition available.

+ Details

Name:	ocfc_SharesToBePurchasedForEsopFromBorrowedFund
Namespace Prefix:	ocfc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Term Loan Additional Borrowings

+ References

No definition available.

+ Details

Name:	ocfc_TermLoanAdditionalBorrowings
Namespace Prefix:	ocfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Term Of Loan Repaid By Employee Stock Ownership Plan

+ References

No definition available.

+ Details

Name:	ocfc_TermOfLoanRepaidByEmployeeStockOwnershipPlan
Namespace Prefix:	ocfc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.F)

-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

+ Details

Name:	us-gaap_AllocatedShareBasedCompensationExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount reported as a liability as of the balance sheet date by the entity (the employer) of the loan made by a third-party lender directly to the ESOP.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Direct Loan

-URI http://asc.fasb.org/extlink&oid=6510849

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 40

-Section 25

-Paragraph 9

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6418455&loc=d3e16545-113920

+ Details

Name:	us-gaap_EmployeeStockOwnershipPlanESOPDebtStructureDirectLoanAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fair value of shares held by the ESOP as of the balance sheet date in which no ESOP participant has a vested interest and no lender has a claim. The fair value of an ESOP share is the amount the seller could reasonably expect to receive for it in a current sale between a willing buyer and a willing seller, that is, other than in a forced or liquidation sale, which would be the market price of the stock if it is publicly traded.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 40

-Section 50

-Paragraph 1

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929

+ Details

Name:	us-gaap_EmployeeStockOwnershipPlanESOPDeferredSharesFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Dividends paid on stock held by an employee stock ownership plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 40

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929

+ Details

Name:	us-gaap_EmployeeStockOwnershipPlanESOPDividendsPaidToESOP
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The shares or units in an ESOP trust that have been assigned to individual participant accounts based on a known formula. IRS rules require allocations to be nondiscriminatory generally based on compensation, length of service, or a combination of both. For any particular participant such shares or units may be vested, unvested, or partially vested.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 40

-Section 50

-Paragraph 1

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929

+ Details

Name:	us-gaap_EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The shares that, although not legally released, will be released by a future scheduled and committed debt service payment and will be allocated to employees for service rendered in the current accounting period. The ESOP documents typically define the period of service to which the shares relate. ESOP shares are released to compensate employees directly, to settle employer liabilities for other employee benefits, and to replace dividends on allocated shares that are used for debt service.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 40

-Section 50

-Paragraph 1

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929

+ Details

Name:	us-gaap_EmployeeStockOwnershipPlanESOPNumberOfCommittedToBeReleasedShares
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis=ocfc_EmployeeStockOwnershipPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Employee Stock Ownership Plan - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	May 12, 1998
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Purchase of common stock shares	2,013,137
Fixed interest rate	8.25%
Contributions to ESOP	$ 512,000	$ 515,000
Dividends paid unallocated ESOP shares	209,000	221,000
Outstanding loan	3,707,000	3,897,000
Unallocated shares of ESOP	394,816	428,749
Fair value of unallocated shares	6,767,000
Compensation expense related to ESOP	570,000	538,000	480,000
Shares allocated to participants	2,218,138
Shares committed to be released	33,932
Minimum [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Extended loan term	12 years
Maximum [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Extended loan term	30 years
Employee Stock Ownership Plan [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Minimum age limit for employees to participate in ESOP	21 years
Minimum number of working hours	1000 hours
ESOP original borrowings	13,421,000
Additional common stock shares				633,750
Additional borrowings				8,200,000
Expiration period	2026
Compensation expense related to ESOP	570,000	538,000	480,000
Increase in the average fair value	$ 284,000	$ 250,000	$ 191,000