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FAIR VALUE (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Fair Value On Non Recurring Basis [Line Items]        
Foreclosed real estate $ 100us-gaap_ForeclosedAssets $ 335us-gaap_ForeclosedAssets $ 1,114us-gaap_ForeclosedAssets $ 1,846us-gaap_ForeclosedAssets
Fair Value, Measurements, Nonrecurring [Member]        
Fair Value On Non Recurring Basis [Line Items]        
Impaired loans 7,359nvsl_ImpairedLoans
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
7,316nvsl_ImpairedLoans
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
   
Foreclosed real estate 100us-gaap_ForeclosedAssets
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
335us-gaap_ForeclosedAssets
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
   
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]        
Fair Value On Non Recurring Basis [Line Items]        
Impaired loans 0nvsl_ImpairedLoans
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
0nvsl_ImpairedLoans
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
   
Foreclosed real estate 0us-gaap_ForeclosedAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
0us-gaap_ForeclosedAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
   
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]        
Fair Value On Non Recurring Basis [Line Items]        
Impaired loans 0nvsl_ImpairedLoans
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
0nvsl_ImpairedLoans
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
   
Foreclosed real estate 0us-gaap_ForeclosedAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
0us-gaap_ForeclosedAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
   
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]        
Fair Value On Non Recurring Basis [Line Items]        
Impaired loans 7,359nvsl_ImpairedLoans
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
7,316nvsl_ImpairedLoans
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
   
Foreclosed real estate $ 100us-gaap_ForeclosedAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
$ 335us-gaap_ForeclosedAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember