Merger (Schedule of Purchase Price Allocation) (Details) - USD ($)		12 Months Ended
	Apr. 30, 2018	Dec. 31, 2018	Dec. 31, 2019	Mar. 31, 2019
Business Acquisition [Line Items]
Increase in Step One basis from equity gain in acquisition		$ 415,000
Adjustments to reflect assets acquired and liabilities assumed at fair value:
Goodwill		9,139,000	$ 9,047,000
Liverpool Community Bank [Member]
Business Acquisition [Line Items]
April 30, 2018 JUVF basis in LCB (before gain)	$ 4,622,000
Increase in Step One basis from equity gain in acquisition	415,000
Total Step One adjusted basis	5,037,000
Purchase price assigned to LCB common shares exchanged for 315,284 JUVF common shares	6,463,000
Purchase price assigned to LCB common shares exchanged for cash including cash in lieu of fractional shares	1,362,000
Total Step Two purchase price consideration	7,825,000
Total Step One adjusted basis	12,862,000
Net assets acquired:
Tangible common equity	9,246,000
Adjustments to reflect assets acquired and liabilities assumed at fair value:
Goodwill	$ 3,691,000	$ 3,691,000	$ 3,599,000	$ 3,599,000
Number of shares issued upon the closing of acquisition	315,284
Liverpool Community Bank [Member] | Originally Reported [Member]
Business Acquisition [Line Items]
April 30, 2018 JUVF basis in LCB (before gain)	$ 4,622,000
Increase in Step One basis from equity gain in acquisition	415,000
Total Step One adjusted basis	5,037,000
Purchase price assigned to LCB common shares exchanged for 315,284 JUVF common shares	6,463,000
Purchase price assigned to LCB common shares exchanged for cash including cash in lieu of fractional shares	1,362,000
Total Step Two purchase price consideration	7,825,000
Total Step One adjusted basis	12,862,000
Net assets acquired:
Tangible common equity	9,246,000
Adjustments to reflect assets acquired and liabilities assumed at fair value:
Total fair value adjustments	(95,000)
Associated deferred income taxes	20,000
Fair value adjustments to net assets acquired, net of tax	(75,000)
Total net assets acquired	9,171,000
Goodwill	$ 3,691,000