Subsequent Events - Additional Information (Detail) $ in Thousands	Jul. 31, 2015 USD ($) shares	Jun. 30, 2015 USD ($) Office	Dec. 31, 2014 USD ($)
Subsequent Event [Line Items]
Total assets		$ 2,395,100	$ 2,356,714
Total loans		1,772,879	1,688,846
Total deposits		$ 1,761,675	$ 1,720,135
Subsequent Event [Member]
Subsequent Event [Line Items]
Common stock exchanged for each share of Colonial common stock | shares	0.3658
Preferred stock exchanged for each share of Colonial common stock | shares	0.3658
Total issuance of common stock | shares	660,098
Subsequent Event [Member] | Toms River Market [Member]
Subsequent Event [Line Items]
Total deposits	$ 24,600
Core deposits	20,200
Ocean First Financial Corporation and Colonial American Bank [Member] | Central New Jersey Market [Member]
Subsequent Event [Line Items]
Number of offices | Office		26
Colonial American Bank [Member] | Central New Jersey Market [Member]
Subsequent Event [Line Items]
Total assets		$ 143,200
Total loans		125,800
Total deposits		$ 127,500
Colonial American Bank [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Cost of acquisition	$ 11,900