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Retirement Plans and Other Postretirement Benefits - Reconciliation of Beginning and Ending Balances for Measurements in Hierarchy Level 3 (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Beginning Balance $ 4,339uvsp_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisDefinedBenefitPlanAssetValue $ 4,503uvsp_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisDefinedBenefitPlanAssetValue
Total Unrealized (Losses) or Gains 0uvsp_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisDefinedBenefitPlanAssetGainLossIncludedInOtherComprehensiveIncomeLoss 0uvsp_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisDefinedBenefitPlanAssetGainLossIncludedInOtherComprehensiveIncomeLoss
Total Realized Gains or (Losses) 0uvsp_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisDefinedBenefitPlanAssetGainLossIncludedInEarnings 0uvsp_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisDefinedBenefitPlanAssetGainLossIncludedInEarnings
Purchases 595uvsp_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisDefinedBenefitPlanAssetPurchases 280uvsp_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisDefinedBenefitPlanAssetPurchases
Maturities/ Redemptions (899)uvsp_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisDefinedBenefitPlanAssetSettlements (444)uvsp_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisDefinedBenefitPlanAssetSettlements
Ending Balance 4,035uvsp_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisDefinedBenefitPlanAssetValue 4,339uvsp_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisDefinedBenefitPlanAssetValue
Certificates of Deposit [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Beginning Balance 4,339uvsp_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisDefinedBenefitPlanAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CertificatesOfDepositMember		 4,503uvsp_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisDefinedBenefitPlanAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CertificatesOfDepositMember
Total Unrealized (Losses) or Gains 0uvsp_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisDefinedBenefitPlanAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CertificatesOfDepositMember		 0uvsp_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisDefinedBenefitPlanAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CertificatesOfDepositMember
Total Realized Gains or (Losses) 0uvsp_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisDefinedBenefitPlanAssetGainLossIncludedInEarnings
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CertificatesOfDepositMember		 0uvsp_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisDefinedBenefitPlanAssetGainLossIncludedInEarnings
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CertificatesOfDepositMember
Purchases 595uvsp_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisDefinedBenefitPlanAssetPurchases
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CertificatesOfDepositMember		 280uvsp_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisDefinedBenefitPlanAssetPurchases
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CertificatesOfDepositMember
Maturities/ Redemptions (899)uvsp_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisDefinedBenefitPlanAssetSettlements
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CertificatesOfDepositMember		 (444)uvsp_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisDefinedBenefitPlanAssetSettlements
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CertificatesOfDepositMember
Ending Balance $ 4,035uvsp_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisDefinedBenefitPlanAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CertificatesOfDepositMember		 $ 4,339uvsp_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisDefinedBenefitPlanAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CertificatesOfDepositMember