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LOANS RECEIVABLE (Details 5) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Interest Income Recognized By Class Of Impaired Loans [Line Items]    
Average Recorded Investments $ 7,408us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment $ 14,560us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Interest Income Recognized 43us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod 98us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
One to four family [Member]    
Interest Income Recognized By Class Of Impaired Loans [Line Items]    
Average Recorded Investments 4,329us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= nvsl_OneToFourFamilyMember
6,896us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= nvsl_OneToFourFamilyMember
Interest Income Recognized 36us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= nvsl_OneToFourFamilyMember
53us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= nvsl_OneToFourFamilyMember
Construction Loans [Member]    
Interest Income Recognized By Class Of Impaired Loans [Line Items]    
Average Recorded Investments 685us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConstructionLoansMember
1,715us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConstructionLoansMember
Interest Income Recognized 0us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConstructionLoansMember
1us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConstructionLoansMember
Multi Family and Commercial Real Estate [Member]    
Interest Income Recognized By Class Of Impaired Loans [Line Items]    
Average Recorded Investments 967us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= nvsl_MultiFamilyAndCommercialRealEstateMember
3,479us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= nvsl_MultiFamilyAndCommercialRealEstateMember
Interest Income Recognized 0us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= nvsl_MultiFamilyAndCommercialRealEstateMember
17us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= nvsl_MultiFamilyAndCommercialRealEstateMember
Commercial Business Loans [Member]    
Interest Income Recognized By Class Of Impaired Loans [Line Items]    
Average Recorded Investments 951us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
1,931us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Interest Income Recognized 3us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
22us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Consumer Loans [Member]    
Interest Income Recognized By Class Of Impaired Loans [Line Items]    
Average Recorded Investments 476us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= nvsl_ConsumerLoansMember
539us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= nvsl_ConsumerLoansMember
Interest Income Recognized $ 4us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= nvsl_ConsumerLoansMember
$ 5us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= nvsl_ConsumerLoansMember