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MORTGAGE BANKING ACTIVITY (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Non Interest Income [Line Items]    
Gain on sales of mortgage loans $ 217us-gaap_GainLossOnSalesOfLoansNet $ 143us-gaap_GainLossOnSalesOfLoansNet
Mortgage servicing income 1us-gaap_FeesAndCommissionsMortgageBankingAndServicing 5us-gaap_FeesAndCommissionsMortgageBankingAndServicing
Gain on sale of mortgage servicing rights 0nvsl_GainLossOnSaleOfMortgageServicingRights 0nvsl_GainLossOnSaleOfMortgageServicingRights
Total $ 218us-gaap_NoninterestIncomeOther $ 148us-gaap_NoninterestIncomeOther