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DEPOSITS (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Deposits [Line Items]    
Noninterest bearing demand deposits $ 70,413us-gaap_NoninterestBearingDepositLiabilities $ 68,957us-gaap_NoninterestBearingDepositLiabilities
Interest bearing deposits    
Now accounts and money market accounts 52,669us-gaap_DepositsMoneyMarketDeposits 50,738us-gaap_DepositsMoneyMarketDeposits
Savings accounts 109,635us-gaap_DepositsSavingsDeposits 108,488us-gaap_DepositsSavingsDeposits
Certificates of deposit 146,267us-gaap_DemandDepositAccounts 145,276us-gaap_DemandDepositAccounts
Total interest bearing deposits 308,571us-gaap_InterestBearingDepositLiabilities 304,502us-gaap_InterestBearingDepositLiabilities
Total deposits $ 378,984us-gaap_Deposits $ 373,459us-gaap_Deposits
Noninterest bearing demand deposits, Percentage 18.60%nvsl_NonInterestBearingDepositLiabilitiesPercentage 18.50%nvsl_NonInterestBearingDepositLiabilitiesPercentage
Now accounts and money market accounts, Percentage 13.90%nvsl_InterestBearingDomesticDepositNegotiableOrderOfWithdrawalNowPercentage 13.60%nvsl_InterestBearingDomesticDepositNegotiableOrderOfWithdrawalNowPercentage
Savings accounts, Percentage 28.90%nvsl_InterestBearingDomesticDepositSavingsPercentage 29.00%nvsl_InterestBearingDomesticDepositSavingsPercentage
Certificates Of Deposit, Percentage 38.60%nvsl_CertificatesOfDepositPercentage 38.90%nvsl_CertificatesOfDepositPercentage
Total interest bearing deposits, Percentage 81.40%nvsl_InterestBearingDepositLiabilitiesPercentage 81.50%nvsl_InterestBearingDepositLiabilitiesPercentage
Total deposits 100.00%nvsl_DepositsPercentage 100.00%nvsl_DepositsPercentage