Parent-only Financial Information - Statements of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Total interest income	$ 90,385	$ 93,026	$ 95,648	$ 92,411	$ 93,922	$ 91,261	$ 88,315	$ 86,331	$ 371,470	$ 359,829	$ 323,846
Non-interest expense	53,731	49,738	49,694	48,416	49,360	46,659	48,806	46,910	201,579	191,735	187,822
Income tax expense	8,026	9,938	8,802	7,689	6,026	8,575	4,568	6,361	34,455	25,530	46,528
Net income	$ 25,951	$ 31,399	$ 24,393	$ 30,890	$ 35,763	$ 35,468	$ 19,243	$ 27,913	112,633	118,387	93,949
Provident Financial Services, Inc.
Condensed Financial Statements, Captions [Line Items]
Dividends from subsidiary									72,809	53,604	59,980
Interest income									1,470	1,657	1,839
Investment gain									162	2,294	17
Total interest income									74,441	57,555	61,836
Non-interest expense									1,192	1,049	1,021
Total expense									1,192	1,049	1,021
Income before income tax expense									73,249	56,506	60,815
Income tax expense									127	692	312
Income before undistributed net income of subsidiary									73,122	55,814	60,503
Earnings in excess of dividends (equity in undistributed net income) of subsidiary									39,511	62,573	33,446
Net income									$ 112,633	$ 118,387	$ 93,949