Juniata Valley Financial Corp. (Parent Company Only) Financial Information (Schedule of Condensed Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash and cash equivalents	$ 41,621	$ 12,740
Equity securities	1,091	1,144
Debt securities available for sale	286,415	210,686
Total assets	793,718	670,632
Stockholders' equity	76,597	73,707	$ 67,378
Total liabilities and stockholders' equity	793,718	670,632
Parent Company [Member]
Cash and cash equivalents	145	80
Investment in bank subsidiary	75,441	72,353
Equity securities	935	947
Debt securities available for sale	0	253
Other assets	77	99
Total assets	76,598	73,732
Accounts payable and other liabilities	1	25
Stockholders' equity	76,597	73,707
Total liabilities and stockholders' equity	$ 76,598	$ 73,732