CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 104,065	$ 147,357	$ 110,076
Other comprehensive income (loss):
Unrealized gain (loss) on debt securities (net of tax expense of $4,560 in 2023, and tax benefit of $10,629 and $1,142 in 2022 and 2021, respectively)	14,312	(33,402)	(3,837)
Accretion of unrealized loss on debt securities reclassified to held-to-maturity (net of tax expense of $213, $242 and $272 in 2023, 2022, and 2021, respectively)	290	348	395
Unrealized loss on derivative hedges (net of tax benefit of $257 and $8 in 2023 and 2022, respectively)	(808)	(25)	0
Reclassification adjustment for loss (gains) included in net income (net of tax expense of $423 in 2023 and tax benefit of $26 in 2022, respectively)	1,326	(82)	0
Total other comprehensive income (loss), net of tax	15,120	(33,161)	(3,442)
Total comprehensive income	119,185	114,196	106,634
Less: comprehensive income attributable to non-controlling interest	36	754	0
Total comprehensive income attributable to OceanFirst Financial Corp.	119,149	113,442	106,634
Less: Dividends on preferred shares	4,016	4,016	4,016
Total comprehensive income available to common stockholders	$ 115,133	$ 109,426	$ 102,618