Condensed Financial Statements of Parent Only (Schedule of Parent Only Income Statement) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Condensed Income Statements, Captions [Line Items]
Applicable income tax (benefit) provision	$ 1,665	$ 1,258	$ 1,256	$ 446	$ 849	$ 1,295	$ 889	$ 778	$ 4,625	$ 3,811
Net income	$ 4,302	$ 3,202	$ 3,250	$ 1,231	$ 2,551	$ 3,509	$ 2,531	$ 2,218	11,985	10,808
PROVIDENT BANCORP, INC.
Condensed Income Statements, Captions [Line Items]
Total income									371	245
Operating expenses									494	105
Income before income taxes and equity in undistributed net income of The Provident Bank									(123)	140
Applicable income tax (benefit) provision									(34)	39
Income before equity in income of subsidiaries									(89)	101
Equity in undistributed net income of The Provident Bank									12,074	10,707
Net income									$ 11,985	$ 10,808