Parent-Only Financial Information - Condensed Statements of Financial Condition (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Assets
Cash and due from banks	$ 167,946	$ 204,949	$ 1,272,134	$ 120,544
Goodwill	506,146	500,319
Other assets	221,067	147,007
Total assets	13,103,896	11,739,616
Liabilities and Stockholders’ Equity
Borrowings	1,475,666	347,910
Other liabilities	346,155	122,032
OceanFirst Financial Corp. stockholders’ equity	1,584,662	1,516,553
Non-controlling interest	802	0
Total stockholders’ equity	1,585,464	1,516,553	1,484,130	1,153,119
Total liabilities and stockholders’ equity	13,103,896	11,739,616
OceanFirst Financial Corp.
Assets
Cash and due from banks	10,623	8,803	$ 7,187	$ 5,442
Advances to Bank	32,840	63,480
Equity securities	95,261	87,622
ESOP loan receivable	6,751	9,231
Investment in subsidiaries	1,630,199	1,575,549
Goodwill	5,827	0
Other assets	1,760	2,781
Total assets	1,783,261	1,747,466
Liabilities and Stockholders’ Equity
Borrowings	193,469	227,237
Other liabilities	4,328	3,676
OceanFirst Financial Corp. stockholders’ equity	1,584,662	1,516,553
Non-controlling interest	802	0
Total stockholders’ equity	1,585,464	1,516,553
Total liabilities and stockholders’ equity	$ 1,783,261	$ 1,747,466