Parent-Only Financial Information - Condensed Statements of Financial Condition (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Assets
Cash and due from banks	$ 120,544	$ 120,792	$ 109,613	$ 301,373
Other assets	119,465	24,101
Total assets	8,246,145	7,516,154
Liabilities and Stockholders’ Equity
Borrowings	687,800	610,673
Other liabilities	62,565	37,488
Stockholders’ equity	1,153,119	1,039,358	$ 601,941	$ 571,903
Total liabilities and stockholders’ equity	8,246,145	7,516,154
OceanFirst Financial Corp.
Assets
Cash and due from banks	5,442	3,930
Advances to subsidiary Bank	27,878	14,026
Investment securities	1,000	1,000
ESOP loan receivable	9,271	10,431
Investment in subsidiaries	1,206,479	1,107,539
Other assets	327	234
Total assets	1,250,397	1,137,160
Liabilities and Stockholders’ Equity
Borrowings	94,848	94,134
Other liabilities	2,430	3,668
Stockholders’ equity	1,153,119	1,039,358
Total liabilities and stockholders’ equity	$ 1,250,397	$ 1,137,160