Subsequent Events - Additional Information (Detail) (USD $)	0 Months Ended
	Feb. 25, 2015	Dec. 31, 2014	Dec. 31, 2013
Subsequent Event [Line Items]
Total assets		$ 2,356,714,000	$ 2,249,711,000
Total loans		1,688,846,000	1,541,460,000
Total deposits		1,720,135,000	1,746,763,000
Colonial American Bank [Member]
Subsequent Event [Line Items]
Total assets		144,000,000
Total loans		127,000,000
Total deposits		129,000,000
Ocean First Financial Corporation and Colonial American Bank [Member]
Subsequent Event [Line Items]
Total assets		2,500,000,000
Total loans		1,800,000,000
Total deposits		1,800,000,000
Number of offices		25
Subsequent Event [Member]
Subsequent Event [Line Items]
Common stock exchanged for each share of Colonial common stock	0.3736
Preferred stock exchanged for each share of Colonial common stock	0.3736
Subsequent Event [Member] | Colonial American Bank [Member]
Subsequent Event [Line Items]
Cost of acquisition	11,300,000