XML 113 R101.htm IDEA: XBRL DOCUMENT
v3.19.1

Fair Value Measurements - Additional Information (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2018
Fair Value Disclosures [Abstract] |
Estimated selling costs percentage of loans measured for impairment | 15.00%

X
- Definition Estimated selling costs percentage of loans measured for impairment. + References No definition available. + Details
Name: | ocfc_PercentageOfEstimatedSellingCostOnLoansMeasuredForImpairment
Namespace Prefix: | ocfc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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