Parent-Only Financial Information - Condensed Statements of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Interest expense - borrowings									$ 4,733	$ 3,402	$ 4,919
Operating expenses	$ 15,885	$ 15,117	$ 14,208	$ 13,687	$ 14,396	$ 14,431	$ 14,830	$ 14,107	60,775	57,764	59,244
Benefit for income taxes	(2,777)	(2,582)	(2,779)	(2,745)	(2,491)	(2,790)	(2,767)	(2,563)	(10,883)	(10,611)	(8,613)
Net income	$ 5,230	$ 4,698	$ 5,133	$ 5,261	$ 4,932	$ 5,165	$ 5,117	$ 4,706	20,322	19,920	16,330
OceanFirst Financial Corp. [Member]
Condensed Financial Statements, Captions [Line Items]
Dividend income - subsidiary Bank									16,000	16,000	16,000
Interest and dividend income - investment securities									3	279	287
Net gain on sales of investment securities available-for-sale										1,031	46
Interest income - advances to subsidiary Bank									51	44	40
Interest income - ESOP loan receivable									306	322	336
Total income									16,360	17,676	16,709
Interest expense - borrowings									736	767	766
Operating expenses									1,452	1,365	1,358
Income before income taxes and undistributed earnings of subsidiary Bank									14,172	15,544	14,585
Benefit for income taxes									634	229	567
Income before undistributed earnings of subsidiary Bank									14,806	15,773	15,152
Undistributed earnings of subsidiary Bank									5,516	4,147	1,178
Net income									$ 20,322	$ 19,920	$ 16,330