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REGULATORY MATTERS (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Capital Unit [Line Items]    
Tier 1 Leverage Capital Required for Adequately Capital Requirements, Percentage 11.86%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets  
Tier 1 Leverage Capital, Individual Minimum Capital Requirements, Percentage 9.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets  
Total Risk-Based Capital Individual Minimum Capital Requirements, Percentage 13.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets  
Total Risk-Based Capital Actual, Percentage 17.64%us-gaap_CapitalToRiskWeightedAssets  
Company Consolidated [Member]    
Capital Unit [Line Items]    
Tier 1 Leverage Capital Required for Adequately Capital Requirements, Amount $ 0us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= nvsl_CompanyConsolidatedMember		 [1] $ 0us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= nvsl_CompanyConsolidatedMember		 [1]
Tier 1 Risk-Based Capital Required for Adequately Capital Requirements, Amount 0us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= nvsl_CompanyConsolidatedMember		 [2] 0us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= nvsl_CompanyConsolidatedMember		 [2]
Total Risk-Based Capital Required for Adequately Capital Requirements, Amount 0us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= nvsl_CompanyConsolidatedMember		 [2] 0us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= nvsl_CompanyConsolidatedMember		 [2]
Tier 1 Leverage Capital Required for Adequately Capital Requirements, Percentage 0.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= nvsl_CompanyConsolidatedMember		 [1] 0.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= nvsl_CompanyConsolidatedMember		 [1]
Tier 1 Risk Based Capital Required for Adequately Capital Requirements, Percentage 0.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= nvsl_CompanyConsolidatedMember		 [2] 0.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= nvsl_CompanyConsolidatedMember		 [2]
Total Risk-Based Capital Required for Adequately Capital Requirements, Percentage 0.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= nvsl_CompanyConsolidatedMember		 [2] 0.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= nvsl_CompanyConsolidatedMember		 [2]
Tier 1 Leverage Capital, Individual Minimum Capital Requirements, Amount 0us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= nvsl_CompanyConsolidatedMember		 [1],[3] 0us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= nvsl_CompanyConsolidatedMember		 [1],[3]
Tier 1 Risk-Based Capital Individudal Minimum Capital Requirements, Amount 0us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= nvsl_CompanyConsolidatedMember		 [2],[3] 0us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= nvsl_CompanyConsolidatedMember		 [2],[3]
Total Risk-Based Capital Individual Minimum Capital Requirements, Amount 0us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= nvsl_CompanyConsolidatedMember		 [2],[3] 0us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= nvsl_CompanyConsolidatedMember		 [2],[3]
Tier 1 Leverage Capital, Individual Minimum Capital Requirements, Percentage 0.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= nvsl_CompanyConsolidatedMember		 [1],[3] 0.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= nvsl_CompanyConsolidatedMember		 [1],[3]
Tier 1 Risk-Based Capital Individual Minimum Capital Requirements, Percentage 0.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= nvsl_CompanyConsolidatedMember		 [2],[3] 0.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= nvsl_CompanyConsolidatedMember		 [2],[3]
Total Risk-Based Capital Individual Minimum Capital Requirements, Percentage 0.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= nvsl_CompanyConsolidatedMember		 [2],[3] 0.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= nvsl_CompanyConsolidatedMember		 [2],[3]
Tier 1 Leverage Capital, Actual, Amount 59,899us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= nvsl_CompanyConsolidatedMember		 [1] 59,611us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= nvsl_CompanyConsolidatedMember		 [1]
Tier 1 Risk-Based Capital Actual, Amount 59,899us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= nvsl_CompanyConsolidatedMember		 [2] 59,611us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= nvsl_CompanyConsolidatedMember		 [2]
Total Risk-Based Capital Actual, Amount 64,148us-gaap_Capital
/ dei_LegalEntityAxis
= nvsl_CompanyConsolidatedMember		 [2] 63,571us-gaap_Capital
/ dei_LegalEntityAxis
= nvsl_CompanyConsolidatedMember		 [2]
Tier 1 Leverage Capital Actual, Percentage 12.13%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= nvsl_CompanyConsolidatedMember		 [1] 12.09%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= nvsl_CompanyConsolidatedMember		 [1]
Tier 1 Risk-Based Capital Actual, Percentage 17.71%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= nvsl_CompanyConsolidatedMember		 [2] 18.94%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= nvsl_CompanyConsolidatedMember		 [2]
Total Risk-Based Capital Actual, Percentage 18.97%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= nvsl_CompanyConsolidatedMember		 [2] 20.20%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= nvsl_CompanyConsolidatedMember		 [2]
Bank [Member]    
Capital Unit [Line Items]    
Tier 1 Leverage Capital Required for Adequately Capital Requirements, Amount 19,826us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= nvsl_BankMember		 [1] 19,796us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= nvsl_BankMember		 [1]
Tier 1 Risk-Based Capital Required for Adequately Capital Requirements, Amount 20,290us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= nvsl_BankMember		 [2] 12,658us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= nvsl_BankMember		 [2]
Total Risk-Based Capital Required for Adequately Capital Requirements, Amount 27,053us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= nvsl_BankMember		 [2] 25,317us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= nvsl_BankMember		 [2]
Tier 1 Leverage Capital Required for Adequately Capital Requirements, Percentage 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= nvsl_BankMember		 [1] 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= nvsl_BankMember		 [1]
Tier 1 Risk Based Capital Required for Adequately Capital Requirements, Percentage 6.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= nvsl_BankMember		 [2] 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= nvsl_BankMember		 [2]
Total Risk-Based Capital Required for Adequately Capital Requirements, Percentage 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= nvsl_BankMember		 [2] 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= nvsl_BankMember		 [2]
Tier 1 Leverage Capital, Individual Minimum Capital Requirements, Amount 44,609us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= nvsl_BankMember		 [1],[3] 44,541us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= nvsl_BankMember		 [1],[3]
Tier 1 Risk-Based Capital Individudal Minimum Capital Requirements, Amount 0us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= nvsl_BankMember		 [2],[3] 0us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= nvsl_BankMember		 [2],[3]
Total Risk-Based Capital Individual Minimum Capital Requirements, Amount 43,961us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= nvsl_BankMember		 [2],[3] 41,139us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= nvsl_BankMember		 [2],[3]
Tier 1 Leverage Capital, Individual Minimum Capital Requirements, Percentage 9.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= nvsl_BankMember		 [1],[3] 9.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= nvsl_BankMember		 [1],[3]
Tier 1 Risk-Based Capital Individual Minimum Capital Requirements, Percentage 0.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= nvsl_BankMember		 [2],[3] 0.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= nvsl_BankMember		 [2],[3]
Total Risk-Based Capital Individual Minimum Capital Requirements, Percentage 13.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= nvsl_BankMember		 [2],[3] 13.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= nvsl_BankMember		 [2],[3]
Tier 1 Leverage Capital, Actual, Amount 55,415us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= nvsl_BankMember		 [1] 55,090us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= nvsl_BankMember		 [1]
Tier 1 Risk-Based Capital Actual, Amount 55,415us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= nvsl_BankMember		 [2] 55,090us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= nvsl_BankMember		 [2]
Total Risk-Based Capital Actual, Amount 59,663us-gaap_Capital
/ dei_LegalEntityAxis
= nvsl_BankMember		 [2] 59,071us-gaap_Capital
/ dei_LegalEntityAxis
= nvsl_BankMember		 [2]
Tier 1 Leverage Capital Actual, Percentage 11.18%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= nvsl_BankMember		 [1] 11.13%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= nvsl_BankMember		 [1]
Tier 1 Risk-Based Capital Actual, Percentage 16.39%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= nvsl_BankMember		 [2] 17.41%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= nvsl_BankMember		 [2]
Total Risk-Based Capital Actual, Percentage 17.64%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= nvsl_BankMember		 [2] 18.67%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= nvsl_BankMember		 [2]
Common Equity Tier one Adequately Capitalized Requirements 15,217nvsl_CommonEquityTierOneAdequatelyCapitalizedRequirements
/ dei_LegalEntityAxis
= nvsl_BankMember		 [2],[4]  
Common Equity Tier one Adequately Capitalized Requirements, Percentage 4.50%nvsl_CommonEquityTierOneAdequatelyCapitalizedRequirementsPercentage
/ dei_LegalEntityAxis
= nvsl_BankMember		 [2],[4]  
Common Equity Tier One Individual Minimum Capital Requirements 0nvsl_CommonEquityTierOneIndividualMinimumCapitalRequirements
/ dei_LegalEntityAxis
= nvsl_BankMember		 [2],[3],[4]  
Common Equity Tier One Individual Minimum Capital Requirements, Percentage 0.00%nvsl_CommonEquityTierOneIndividualMinimumCapitalRequirementsPercentage
/ dei_LegalEntityAxis
= nvsl_BankMember		 [2],[3],[4]  
Common Equity Tier One Actual $ 55,415nvsl_CommonEquityTierOneActual
/ dei_LegalEntityAxis
= nvsl_BankMember		 [2],[4]  
Common Equity Tier One Actual, Percentage 16.39%nvsl_CommonEquityTierOneActualPercentage
/ dei_LegalEntityAxis
= nvsl_BankMember		 [2],[4]  
[1] Tier 1 capital to total assets.
[2] Tier 1 or total risk-based capital to risk-weighted assets.
[3] Effective June 4, 2013.
[4] New capital requirement under Basel III effective January 1, 2015.