Operating Lease Obligations (ROU Assets and Lease Liabilities) (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) lease	Dec. 31, 2019 USD ($)	Jan. 01, 2019 USD ($)
Number of Operating Lease Obligations | lease	4
Consolidated statements of condition classification of the Company's ROU assets and lease liabilities
Practical expedients package	true
Practical expedients, use of hindsight	true
Operating lease ROU assets	$ 379,000
Operating lease ROU assets, statement of financial position	juvf:AccruedInterestReceivableAndOtherAssets
Lease liability	$ 388,000
Operating lease liabilities, statement of financial position	juvf:AccruedInterestPayableAndOtherLiabilities
Options to renew	true
Weighted-average remaining operating lease term	7 years 1 month 6 days
Weighted-average discount rate	5.46%
Total operating cost	$ 116,000	$ 120,000
Total operating lease payment to related parties	$ 24,000	$ 23,000
ASU 2016-02 [Member]
Consolidated statements of condition classification of the Company's ROU assets and lease liabilities
Operating lease ROU assets			$ 556,000
Operating lease ROU assets, statement of financial position			juvf:AccruedInterestReceivableAndOtherAssets
Lease liability			$ 556,000
Operating lease liabilities, statement of financial position			juvf:AccruedInterestPayableAndOtherLiabilities