Parent-only Financial Information - Financial Condition (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets
Cash and due from banks	$ 404,355	$ 131,555
Available for sale debt securities, at fair value	1,105,489	976,919
Other assets	221,360	136,291
Total assets	12,919,741	9,808,578
Liabilities and Stockholders’ Equity
Other liabilities	226,710	140,179
Subordinated debentures	25,135	0
Total stockholders’ equity	1,619,797	1,413,840	$ 1,358,980	$ 1,298,661
Total liabilities and stockholders’ equity	12,919,741	9,808,578
Provident Financial Services, Inc.
Assets
Cash and due from banks	10,634	29,723
Available for sale debt securities, at fair value	971	825
Investment in subsidiary	1,561,769	1,364,097
ESOP loan	25,555	31,113
Other assets	(622)	37
Total assets	1,640,654	1,425,795
Liabilities and Stockholders’ Equity
Due to subsidiary—SAP	0	11,741
Other liabilities	(4,279)	214
Subordinated debentures	25,135	0
Total stockholders’ equity	1,619,798	1,413,840
Total liabilities and stockholders’ equity	$ 1,640,654	$ 1,425,795