Represents the amount of pre-tax settlement charges.

No definition available.

Name:	juvf_DefinedBenefitPlanPreTaxSettlementCharge
Namespace Prefix:	juvf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage of increase (decrease) in pension liability.

+ References

No definition available.

+ Details

Name:	juvf_PercentageOfIncreaseDecreaseInPensionLiability
Namespace Prefix:	juvf_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of vested benefit

+ References

No definition available.

+ Details

Name:	juvf_PercentageOfVestedBenefit
Namespace Prefix:	juvf_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of gain (loss), recognized immediately as component of net periodic benefit (cost) credit, for change in value of benefit obligation or plan assets from experience different from that assumed, change in actuarial assumption, or consequence of temporarily deviating from substantive plan. Includes, but is not limited to, amount in excess of ten percent of greater of fair value of plan assets or benefit obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)(4)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of increase (decrease) in plan assets of defined benefit plan from assets transferred into (from) plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedBenefitPlanAssetsTransferredToFromPlan
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_PlanNameAxis=juvf_JuniataValleyBankRetirementPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Defined Benefit Retirement Plan (Narrative) (Details) - USD ($)	3 Months Ended			9 Months Ended	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2019	Dec. 31, 2007
Defined Benefit Plan Disclosure [Line Items]
Percentage of increase (decrease) in pension liability		9.00%	12.00%
Defined benefit plan, pre-tax settlement charge	$ 943,000	$ 210,000	$ 377,000
Contribution to the defined benefit pension plan		$ 1,350,000
JVB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, pre-tax settlement charge	278,000
Percentage of vested benefit					100.00%
Net actuarial gain (loss) recognized in other comprehensive income	$ (306,000)
Excess funds transferred to 401(k) plan				$ (431,000)