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This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statementsNo definition available.false2Assets Measured at Fair Value Disclosure Nonrecurring52false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse28false USDtruefalse$Context_FYE__31-Dec-2012_ImpairedLoansAxis_InstallmentLoanMember_FairValueByFairValueHierarchyLevelAxis_FairValueInputsLevel3Memberhttp://www.sec.gov/CIK0000353191duration2012-01-01T00:00:002012-12-31T00:00:00falsefalseInstallmentnovb_ImpairedLoansAxisxbrldihttp://xbrl.org/2006/xbrldinovb_InstallmentLoanMembernovb_ImpairedLoansAxisexplicitMemberfalsefalseLevel 3us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Installment | Level 353true 4novb_ImpairedLoansAbstract0novb_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Impaired loans:54false 5novb_AssetsMeasuredAtFairValueDisclosureBasisnovb_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse7500075USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThis element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value and its related losses/gains on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statementsNo definition available.false2Assets Measured at Fair Value Disclosure Nonrecurring55false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse29false USDtruefalse$Context_6ME__30-Jun-2013_ImpairedLoansAxis_OtherRealEstateMember_FairValueByFairValueHierarchyLevelAxis_EstimateOfFairValueFairValueDisclosureMemberhttp://www.sec.gov/CIK0000353191duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseReal estate - othernovb_ImpairedLoansAxisxbrldihttp://xbrl.org/2006/xbrldinovb_OtherRealEstateMembernovb_ImpairedLoansAxisexplicitMemberfalsefalseEstimate Of Fair Value, Fair Value Disclosureus-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EstimateOfFairValueFairValueDisclosureMemberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Real estate - other | Estimate Of Fair Value, Fair Value Disclosure56true 4novb_ImpairedLoansAbstract0novb_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Impaired loans:57false 5novb_AssetsMeasuredAtFairValueDisclosureBasisnovb_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse109000109USD$falsefalsefalse2truefalsefalse2500025USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThis element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value and its related losses/gains on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statementsNo definition available.false2Assets Measured at Fair Value Disclosure Nonrecurring58false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse31false USDtruefalse$Context_6ME__30-Jun-2013_ImpairedLoansAxis_OtherRealEstateMember_FairValueByFairValueHierarchyLevelAxis_FairValueInputsLevel3Memberhttp://www.sec.gov/CIK0000353191duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseReal estate - othernovb_ImpairedLoansAxisxbrldihttp://xbrl.org/2006/xbrldinovb_OtherRealEstateMembernovb_ImpairedLoansAxisexplicitMemberfalsefalseLevel 3us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Real estate - other | Level 359true 4novb_ImpairedLoansAbstract0novb_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Impaired loans:60false 5novb_AssetsMeasuredAtFairValueDisclosureBasisnovb_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse109000109USD$falsetruefalse2truefalsefalse2500025USD$falsetruefalsexbrli:monetaryItemTypemonetaryThis element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value and its related losses/gains on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statementsNo definition available.false2Assets Measured at Fair Value Disclosure NonrecurringfalseNOTE 14 - FAIR VALUE MEASUREMENTS - (Table 3) (Detail) (USD $)ThousandsUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.novb.com/role/Note13FairValueMeasurementsDetailTable3260