Juniata Valley Financial Corp. (Parent Company Only) Financial Information (Schedule of Condensed Statements of Income and Comprehensive Income) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Other non-interest expense	$ 19,293,000	$ 20,407,000
Income tax (benefit) expense	(50,000)	(14,000)
Net income	5,602,000	5,835,000
Comprehensive income	8,609,000	10,733,000
Parent Company [Member]
Interest and dividends on investment securities available for sale	46,000	47,000
Dividends from bank subsidiary	5,750,000	4,489,000
Change in value of equity securities	(12,000)	8,000
Total income	5,784,000	4,544,000
Other non-interest expense	166,000	176,000
Total expense	166,000	176,000
Income before income taxes and equity in undistributed net income of subsidiary	5,618,000	4,368,000
Income tax (benefit) expense	(32,000)	(35,000)
Income before undistributed net (loss) income of subsidiary	5,650,000	4,403,000
Undistributed net (loss) income of subsidiary	(48,000)	1,432,000
Net income	5,602,000	5,835,000
Comprehensive income	$ 8,609,000	$ 10,733,000