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Financial Instruments with Off-Balance Sheet Risk (Summary of Financial Instrument Commitments) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Commitments to Grant Loans and Unfunded Commitments Under Lines of Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Outstanding letters of credit $ 38,776us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember		 $ 33,532us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember
Unfunded Commitments Under Lines of Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Outstanding letters of credit 6,245us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_FinancialInstrumentAxis
= juvf_UnfundedCommitmentsUnderLinesOfCreditMember		 7,457us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_FinancialInstrumentAxis
= juvf_UnfundedCommitmentsUnderLinesOfCreditMember
Outstanding letters of Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Outstanding letters of credit $ 1,703us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_FinancialInstrumentAxis
= juvf_OutstandingLettersOfCreditMember		 $ 1,199us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_FinancialInstrumentAxis
= juvf_OutstandingLettersOfCreditMember