Juniata Valley Financial Corp. (Parent Company Only) Financial Information (Schedule of Condensed Statements of Cash Flows) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Net income	$ 5,602,000	$ 5,835,000
Net realized (gain) loss on sales and calls of available for sale securities	(855,000)	43,000
Stock-based compensation expense	128,000	113,000
Net cash provided by operating activities	6,775,000	9,941,000
Purchases of: Securities available for sale	(268,399,000)	(125,422,000)
Proceeds from: Sales of securities available for sale	97,389,000	21,777,000
Proceeds from the maturity of available for sale investment securities	98,539,000	38,056,000
Net cash used in investing activities	(92,548,000)	(47,968,000)
Cash dividends	(4,465,000)	(4,489,000)
Purchase of treasury stock	(1,452,000)	(428,000)
Treasury stock issued for stock plans	70,000	400,000
Net cash provided by financing activities	114,654,000	34,311,000
Net increase (decrease) in cash and cash equivalents	28,881,000	(3,716,000)
Cash and cash equivalents at beginning of year	12,740,000	16,456,000
Cash and cash equivalents at end of period	41,621,000	12,740,000
Parent Company [Member]
Net income	5,602,000	5,835,000
Undistributed net income of subsidiary	48,000	(1,432,000)
Change in value of equity securities	12,000	(8,000)
Decrease (increase) in other assets	(13,000)	542,000
Decrease in taxes payable	29,000
Increase (decrease) in accounts payable and other liabilities	(16,000)	14,000
Net cash provided by operating activities	5,662,000	4,951,000
Proceeds from the maturity of available for sale investment securities	250,000	0
Net cash used in investing activities	250,000	0
Cash dividends	(4,465,000)	(4,489,000)
Purchase of treasury stock	(1,452,000)	(428,000)
Treasury stock issued for stock plans	70,000	400,000
Net cash provided by financing activities	(5,847,000)	(4,517,000)
Net increase (decrease) in cash and cash equivalents	65,000	434,000
Cash and cash equivalents at beginning of year	482,000	48,000
Cash and cash equivalents at end of period	$ 547,000	$ 482,000