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MORTGAGE BANKING ACTIVITY (Details Textual) (USD $)
1 Months Ended
Aug. 29, 2014
Freddie Mac [Member]  
Mortgage Banking And Mortgage Servicing Rights [Line Items]  
Servicing Asset at Fair Value, Disposals $ 948,000us-gaap_ServicingAssetAtFairValueDisposals
/ dei_LegalEntityAxis
= nvsl_FreddieMacMember
Other Institution [Member]  
Mortgage Banking And Mortgage Servicing Rights [Line Items]  
Servicing Asset at Fair Value, Disposals $ 134,800,000us-gaap_ServicingAssetAtFairValueDisposals
/ dei_LegalEntityAxis
= nvsl_OtherInstitutionMember