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      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>090900 - Disclosure - Subordinated Debentures (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://norstatesbank.com/role/SubordinatedDebenturesDetails</Role>
      <ShortName>Subordinated Debentures (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>091000 - Disclosure - Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://norstatesbank.com/role/IncomeTaxesDetails</Role>
      <ShortName>Income Taxes (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>091002 - Disclosure - Income Taxes, Reconciliation Income Tax Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://norstatesbank.com/role/IncomeTaxesReconciliationIncomeTaxExpenseDetails</Role>
      <ShortName>Income Taxes, Reconciliation Income Tax Expense (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>091100 - Disclosure - Preferred Stock (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://norstatesbank.com/role/PreferredStockDetails</Role>
      <ShortName>Preferred Stock (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>091200 - Disclosure - Regulatory Matters (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://norstatesbank.com/role/RegulatoryMattersDetails</Role>
      <ShortName>Regulatory Matters (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>091300 - Disclosure - Commitments, Off-Balance Sheet Risk, and Contingencies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://norstatesbank.com/role/CommitmentsOffbalanceSheetRiskAndContingenciesDetails</Role>
      <ShortName>Commitments, Off-Balance Sheet Risk, and Contingencies (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>091400 - Disclosure - Loss Per Share and Capital Matters (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://norstatesbank.com/role/LossPerShareAndCapitalMattersDetails</Role>
      <ShortName>Loss Per Share and Capital Matters (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>091500 - Disclosure - Other Comprehensive Income (Loss) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://norstatesbank.com/role/OtherComprehensiveIncomeLossDetails</Role>
      <ShortName>Other Comprehensive Income (Loss) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>091600 - Disclosure - Fair Value Measurement (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://norstatesbank.com/role/FairValueMeasurementDetails</Role>
      <ShortName>Fair Value Measurement (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>091700 - Disclosure - Parent Company Condensed Financial Statements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://norstatesbank.com/role/ParentCompanyCondensedFinancialStatementsDetails</Role>
      <ShortName>Parent Company Condensed Financial Statements (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>091800 - Disclosure - Quarterly Financial Data (Unaudited) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://norstatesbank.com/role/QuarterlyFinancialDataUnauditedDetails</Role>
      <ShortName>Quarterly Financial Data (Unaudited) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>091900 - Disclosure - Consent Order and Written Agreement (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://norstatesbank.com/role/ConsentOrderAndWrittenAgreementDetails</Role>
      <ShortName>Consent Order and Written Agreement (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <Logs>
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    <Log type="Info">Element us-gaap_CapitalToRiskWeightedAssets had a mix of decimals attribute values: 3 4.</Log>
    <Log type="Info">Element us-gaap_GainLossOnSaleOfSecuritiesNet had a mix of decimals attribute values: -3 0.</Log>
    <Log type="Info">Element us-gaap_GainsLossesOnSalesOfOtherRealEstate had a mix of decimals attribute values: -3 0.</Log>
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    <Log type="Info">Element us-gaap_LoanPortfolioExpense had a mix of decimals attribute values: -3 0.</Log>
    <Log type="Info">Element us-gaap_LoansAndLeasesReceivableGrossCarryingAmount had a mix of decimals attribute values: -3 0.</Log>
    <Log type="Info">Element us-gaap_PreferredStockLiquidationPreference had a mix of decimals attribute values: 0 2.</Log>
    <Log type="Info">Element us-gaap_PreferredStockParOrStatedValuePerShare had a mix of decimals attribute values: 0 2.</Log>
    <Log type="Info">Element us-gaap_PreferredStockValue had a mix of decimals attribute values: -3 0.</Log>
    <Log type="Info">Element us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets had a mix of decimals attribute values: 2 4.</Log>
    <Log type="Info">Element us-gaap_WarrantsAndRightsOutstanding had a mix of decimals attribute values: -3 0.</Log>
    <Log type="Info">'Monetary' elements on report '020000 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '050000 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '090100 - Disclosure - Summary of Significant Accounting Policies (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '090200 - Disclosure - Securities (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '090400 - Disclosure - Allowance for Loan and Lease Losses and Credit Disclosures (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '090402 - Disclosure - Allowance for Loan and Lease Losses and Credit Disclosures, Past Due Loans and Leases (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '090600 - Disclosure - Other Real Estate Owned (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '090700 - Disclosure - Deposits (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '090800 - Disclosure - Borrowings (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '091000 - Disclosure - Income Taxes (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '091002 - Disclosure - Income Taxes, Reconciliation Income Tax Expense (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '091200 - Disclosure - Regulatory Matters (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '091600 - Disclosure - Fair Value Measurement (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '091800 - Disclosure - Quarterly Financial Data (Unaudited) (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">Process Flow-Through: 010000 - Statement - CONSOLIDATED BALANCE SHEETS</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2010'</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2009'</Log>
    <Log type="Info">Process Flow-Through: 010100 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)</Log>
    <Log type="Info">Process Flow-Through: 020000 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Dec. 31, 2012'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Sep. 30, 2012'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Jun. 30, 2012'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Mar. 31, 2012'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Dec. 31, 2011'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Sep. 30, 2011'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Jun. 30, 2011'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Mar. 31, 2011'</Log>
    <Log type="Info">Process Flow-Through: 030000 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE OPERATIONS</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Dec. 31, 2012'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Sep. 30, 2012'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Jun. 30, 2012'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Mar. 31, 2012'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Dec. 31, 2011'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Sep. 30, 2011'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Jun. 30, 2011'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Mar. 31, 2011'</Log>
    <Log type="Info">Process Flow-Through: 040100 - Statement - CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical)</Log>
    <Log type="Info">Process Flow-Through: 050000 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</Log>
  </Logs>
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    <File>nsfc-20121231.xml</File>
    <File>nsfc-20121231.xsd</File>
    <File>nsfc-20121231_cal.xml</File>
    <File>nsfc-20121231_def.xml</File>
    <File>nsfc-20121231_lab.xml</File>
    <File>nsfc-20121231_pre.xml</File>
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  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
