Fair Value Measurements - Additional Information (Detail)	12 Months Ended
Dec. 31, 2015
Debt Instrument Fair Value Carrying Value [Abstract]
Estimated selling costs percentage of other real estate owned and loans	15.00%
Estimated selling costs percentage of loans measured for impairment	15.00%

Estimated selling costs percentage of loans measured for impairment.

No definition available.

Name:	ocfc_PercentageOfEstimatedSellingCostOnLoansMeasuredForImpairment
Namespace Prefix:	ocfc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration