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Parent-only Financial Information - Statements of Operations (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]                      
Total interest income $ 83,596 $ 81,894 $ 80,443 $ 77,913 $ 77,491 $ 76,045 $ 74,805 $ 73,974 $ 323,846 $ 302,315 $ 291,781
Non-interest expense 48,078 46,280 47,340 46,124 47,153 45,850 45,897 44,878 187,822 183,778 180,589
Income tax expense 15,740 11,969 10,451 8,368 10,182 9,281 8,781 8,736 46,528 36,980 36,441
Net income $ 19,483 $ 26,575 $ 24,383 $ 23,508 $ 22,567 $ 22,906 $ 21,356 $ 20,973 93,949 87,802 83,722
Provident Financial Services, Inc. [Member]                      
Condensed Financial Statements, Captions [Line Items]                      
Dividends from subsidiary                 59,980 45,369 41,285
Interest income                 1,839 1,995 2,153
Investment gain                 17 15 12
Total interest income                 61,836 47,379 43,450
Non-interest expense                 1,021 902 812
Total expense                 1,021 902 812
Income before income tax expense                 60,815 46,477 42,638
Income tax expense                 312 414 505
Income before undistributed net income of subsidiary                 60,503 46,063 42,133
Earnings in excess of dividends (equity in undistributed net income) of subsidiary                 33,446 41,739 41,589
Net income                 $ 93,949 $ 87,802 $ 83,722