Merger (Narrative) (Details) - USD ($)		3 Months Ended	6 Months Ended
	Apr. 30, 2018	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Apr. 29, 2018
Business Acquisition [Line Items]
Fair value gain				$ 415,000
Acquiree's common shares outstanding			5,103,628		5,092,048
Goodwill			$ 9,047,000		$ 9,139,000
Income/gain from unconsolidated subsidiary		$ 227,000		296,000
Tax benefit from removal of deferred tax liability		406,000
Liverpool Community Bank [Member]
Business Acquisition [Line Items]
Acquisition date	Apr. 30, 2018
Business acquisition, name of acquired entity			Liverpool Community Bank
Total assets of acquiree	$ 45,360,000
Loans receivables of acquiree	32,091,000
Equity of acquiree	$ 9,246,000		$ 9,246,000
Percentage of equity interest in acquiree, before acquisition						39.16%
Percentage of equity interest acquired	60.84%
Number of acquiree's common shares owned						1,214
Equity owned before acquisition	$ 4,622,000		4,622,000
Juniata's basis in Liverpool	5,037,000		5,037,000
Fair value gain	$ 415,000		415,000
Per share price of Liverpool shares	$ 4,050.00
Acquiree's common shares outstanding						3,100
Number of Juniata's share for each Liverpool share	202.6286
Number of shares issued upon the closing of acquisition	315,284
Fair value of shares issued for acquisition	$ 6,463,000		6,463,000
Closing stock price	$ 20.50
Approximate cash transaction of business acquisition	$ 1,362,000		1,362,000
Juniata's Step One adjusted basis in Liverpool	12,862,000		12,862,000
Step Two purchase price consideration	7,825,000		7,825,000
Goodwill	3,691,000		3,599,000
Goodwill adjustment related to merger			$ (92,000)
Core deposit intangible assets acquired	289,000
Intangible assets amortization period			10 years
Gross amortized cost basis	$ 32,091,000
Income/gain from unconsolidated subsidiary		227,000		296,000
Merger related costs		376,000		440,000
Merger related tax expense (benefit)		$ 31,000		$ 30,000
Federal statutory tax rate				21.00%
Minimum [Member] | Liverpool Community Bank [Member]
Business Acquisition [Line Items]
Percentage of outstanding common stock to be purchased for cash	15.00%
Maximum [Member] | Liverpool Community Bank [Member]
Business Acquisition [Line Items]
Percentage of outstanding common stock to be purchased for cash	20.00%