2.4.0.8149 - Disclosure - DEPOSITS (Details 1)truefalseIn Thousands, unless otherwise specifiedfalse1false USDfalsefalse$PAsOn06_30_2013http://www.sec.gov/CIK0001493552instant2013-06-30T00:00:000001-01-01T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false USDfalsefalse$PAsOn12_31_2012http://www.sec.gov/CIK0001493552instant2012-12-31T00:00:000001-01-01T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1true 3nvsl_DepositsLineItemsnvsl_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Deposits [Line Items]2false 4nvsl_TimeDepositMaturitiesLessThanThreeMonthsnvsl_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse3864700038647USD$falsetruefalse2truefalsefalse2964400029644USD$falsetruefalsexbrli:monetaryItemTypemonetaryAmount of time deposits maturing in less than three months following the latest balance sheet presented. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts.No definition available.false2Three months or less3false 4us-gaap_TimeDepositMaturitiesNextRollingTwelveMonthsus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse3952900039529falsefalsefalse2truefalsefalse6072900060729falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of time deposits maturing in the next rolling twelve months following the latest balance sheet presented. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts.No definition available.false2Over three months through twelve months4false 4us-gaap_TimeDepositMaturitiesRollingYearThreeus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse4850300048503falsefalsefalse2truefalsefalse4443300044433falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of time deposits maturing in the third rolling twelve months following the latest balance sheet presented. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts.No definition available.false2Over one year through three years5false 4us-gaap_TimeDepositMaturitiesRollingYearFourus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse3681800036818falsefalsefalse2truefalsefalse4157200041572falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of time deposits maturing in the fourth rolling twelve months following the latest balance sheet presented. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts.No definition available.false2Over three years6false 4us-gaap_TimeDepositsus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse163497000163497USD$falsetruefalse2truefalsefalse176378000176378USD$falsetruefalsexbrli:monetaryItemTypemonetaryAmount of deposits that cannot be withdrawn before a set date without penalty or for which notice of withdrawal is required. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 9 true2Time Deposits TotalfalseDEPOSITS (Details 1) (USD $)ThousandsUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.nvsl.com/role/DepositsDetails126