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FAIR VALUE (Details Textual) (Remeasured [Member], USD $)
3 Months Ended
Mar. 31, 2015
Remeasured [Member]
 
Fair Value [Line Items]  
Pledged Assets Separately Reported, Loans Pledged as Collateral, at Fair Value, Total $ 1,700,000us-gaap_PledgedAssetsSeparatelyReportedLoansPledgedAsCollateralAtFairValue
/ us-gaap_FairValueByMeasurementFrequencyAxis
= nvsl_RemeasuredMember
Fair Value Of Foreclosed Real Estate $ 39,000nvsl_FairValueOfForeclosedRealEstate
/ us-gaap_FairValueByMeasurementFrequencyAxis
= nvsl_RemeasuredMember