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LOANS RECEIVABLE (Details Textual) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Modifications, Recorded Investment $ 3,749,000us-gaap_FinancingReceivableModificationsRecordedInvestment   $ 3,805,000us-gaap_FinancingReceivableModificationsRecordedInvestment  
Maximum Percentage On Appraised Value Property 75.00%nvsl_MaximumPercentageOnAppraisedValueProperty      
Income Not Recognized On Non Performing Loans 62,000nvsl_IncomeNotRecognizedOnNonPerformingLoans 61,000nvsl_IncomeNotRecognizedOnNonPerformingLoans    
Non Performing Loans 5,285,000nvsl_NonPerformingLoans   5,106,000nvsl_NonPerformingLoans  
Allowance For Loan And Lease Losses Period Increase Decrease Percentage 1.20%nvsl_AllowanceForLoanAndLeaseLossesPeriodIncreaseDecreasePercentage      
Loans and Leases Receivable, Allowance 5,951,000us-gaap_LoansAndLeasesReceivableAllowance 9,865,000us-gaap_LoansAndLeasesReceivableAllowance 6,023,000us-gaap_LoansAndLeasesReceivableAllowance 9,891,000us-gaap_LoansAndLeasesReceivableAllowance
Allowance for Loan and Lease Losses, Period Increase (Decrease) 72,000us-gaap_AllowanceForLoanAndLeaseLossesPeriodIncreaseDecrease      
Loans and Leases Receivable Impaired Non Performing Non Accrual Of Interest For Less Than Ninety days Due 19nvsl_LoansAndLeasesReceivableImpairedNonPerformingNonAccrualOfInterestForLessThanNinetyDaysDue   17nvsl_LoansAndLeasesReceivableImpairedNonPerformingNonAccrualOfInterestForLessThanNinetyDaysDue  
Impaired Financing Receivable Interest Income Cost Recovery Money Method 9,000nvsl_ImpairedFinancingReceivableInterestIncomeCostRecoveryMoneyMethod 61,000nvsl_ImpairedFinancingReceivableInterestIncomeCostRecoveryMoneyMethod    
Financing Receivable Modifications Subsequent Default Non Accrual Status 1,684,000nvsl_FinancingReceivableModificationsSubsequentDefaultNonAccrualStatus   1,600,000nvsl_FinancingReceivableModificationsSubsequentDefaultNonAccrualStatus  
Gain (Loss) on Sale of Loans and Leases 72,000us-gaap_GainLossOnSaleOfLoansAndLeases      
Adversely Classified Loan [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance For Loan And Lease Losses Period Increase Decrease Percentage 3.70%nvsl_AllowanceForLoanAndLeaseLossesPeriodIncreaseDecreasePercentage
/ us-gaap_FinancialInstrumentAxis
= nvsl_AdverselyClassifiedLoanMember
     
Allowance for Loan and Lease Losses, Period Increase (Decrease) 272,000us-gaap_AllowanceForLoanAndLeaseLossesPeriodIncreaseDecrease
/ us-gaap_FinancialInstrumentAxis
= nvsl_AdverselyClassifiedLoanMember
     
Performing Financing Receivable [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Modifications, Recorded Investment 2,981,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
[1]   2,549,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
[1]  
Financing Receivable Modifications Subsequent Default Non Accrual Status 967,000nvsl_FinancingReceivableModificationsSubsequentDefaultNonAccrualStatus
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
  2,164,000nvsl_FinancingReceivableModificationsSubsequentDefaultNonAccrualStatus
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
 
Nonperforming Financing Receivable [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Modifications, Recorded Investment 768,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
[2]   1,256,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
[2]  
Allowance For Loan And Lease Losses Period Increase Decrease Percentage 3.50%nvsl_AllowanceForLoanAndLeaseLossesPeriodIncreaseDecreasePercentage
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
  3.50%nvsl_AllowanceForLoanAndLeaseLossesPeriodIncreaseDecreasePercentage
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
 
Allowance for Loan and Lease Losses, Period Increase (Decrease) 179,000us-gaap_AllowanceForLoanAndLeaseLossesPeriodIncreaseDecrease
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
  179,000us-gaap_AllowanceForLoanAndLeaseLossesPeriodIncreaseDecrease
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
 
Financing Receivable Modifications Subsequent Default Non Accrual Status 717,000nvsl_FinancingReceivableModificationsSubsequentDefaultNonAccrualStatus
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
  1,215,000nvsl_FinancingReceivableModificationsSubsequentDefaultNonAccrualStatus
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
 
Five Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable Modifications Subsequent Default Non Accrual Status   248,000nvsl_FinancingReceivableModificationsSubsequentDefaultNonAccrualStatus
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nvsl_FiveLoansMember
   
One Loan [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Modifications, Recorded Investment 98,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nvsl_OneLoanMember
     
Percentage Of Financing Receivable Modifications 39.50%nvsl_PercentageOfFinancingReceivableModifications
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nvsl_OneLoanMember
     
One Loan [Member] | Nonperforming Financing Receivable [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable Modifications Subsequent Default Non Accrual Status     40,000nvsl_FinancingReceivableModificationsSubsequentDefaultNonAccrualStatus
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nvsl_OneLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
 
One Loan [Member] | Interest Rate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Modifications, Recorded Investment 120,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nvsl_OneLoanMember
/ us-gaap_LongtermDebtTypeAxis
= nvsl_InterestRateMember
     
Percentage Of Financing Receivable Modifications 48.40%nvsl_PercentageOfFinancingReceivableModifications
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nvsl_OneLoanMember
/ us-gaap_LongtermDebtTypeAxis
= nvsl_InterestRateMember
     
Two Loan [Member] | Nonperforming Financing Receivable [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable Modifications Subsequent Default Non Accrual Status 52,000nvsl_FinancingReceivableModificationsSubsequentDefaultNonAccrualStatus
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nvsl_TwoLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
     
Three Loan [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Modifications, Recorded Investment $ 30,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nvsl_ThreeLoanMember
     
Percentage Of Financing Receivable Modifications 12.10%nvsl_PercentageOfFinancingReceivableModifications
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nvsl_ThreeLoanMember
     
[1] Of the $2,981,000 in TDRs which were performing under the modified terms of their agreements at March 31, 2015, there were $967,000 in TDRs that remain on nonaccrual status because these TDRs have not yet demonstrated the requisite period of sustained performance. The combination of the $967,000 performing TDRs and the $717,000 nonperforming TDRs on nonaccrual status at March 31, 2015 equal the $1,684,000 in TDRs that were on nonaccrual status at March 31, 2015. Of the $2,549,000 in TDRs which were performing under the modified terms of their agreements at December 31, 2014, there were $2,164,000 in TDRs that remain on nonaccrual status because these TDRs have not yet demonstrated the requisite period of sustained performance. The combination of the $385,000 performing TDRs and the $1,215,000 nonperforming TDRs on nonaccrual status at December 31, 2014 equal the $1,600,000 in TDRs that were on nonaccrual status at December 31, 2014.
[2] Of the $768,000 in TDRs that were not performing under the modified terms of their agreements at March 31, 2015, all of these loans, except for two loans in the amount of $52,000, were on nonaccrual status. All of the $1,256,000 in TDRs which were not performing under the modified terms of their agreements at December 31, 2014, except for one loan in the amount of $40,000, were on nonaccrual status.