CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 147,357	$ 110,076	$ 63,309
Other comprehensive (loss) income:
Unrealized (loss) gain on debt securities (net of tax benefit of $10,629 and $1,142 in 2022 and 2021, respectively, and tax expense of $411 in and 2020)	(33,402)	(3,837)	1,039
Accretion of unrealized loss on debt securities reclassified to held-to-maturity (net of tax expense of $242, $272 and $310 in 2022, 2021, and 2020, respectively)	348	395	446
Unrealized loss on derivative hedges (net of tax benefit of $8 in 2022)	(25)	0	0
Reclassification adjustment on debt securities for (gains) loss included in net income (net of tax benefit of $26 in 2022 and tax expense of $101 in 2020)	(82)	0	344
Total other comprehensive (loss) income, net of tax	(33,161)	(3,442)	1,829
Total comprehensive income	114,196	106,634	65,138
Less: comprehensive income attributable to non-controlling interest	754	0	0
Total comprehensive income attributable to OceanFirst Financial Corp.	113,442	106,634	65,138
Less: Dividends on preferred shares	4,016	4,016	2,097
Total comprehensive income available to common stockholders	$ 109,426	$ 102,618	$ 63,041