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    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>090900 - Disclosure - DEPOSITS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://cecilbank.com/role/DepositsDetails</Role>
      <ShortName>DEPOSITS (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>091000 - Disclosure - ADVANCES FROM FEDERAL HOME LOAN BANK OF ATLANTA ("FHLB") (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://cecilbank.com/role/AdvancesFromFederalHomeLoanBankOfAtlantaFhlbDetails</Role>
      <ShortName>ADVANCES FROM FEDERAL HOME LOAN BANK OF ATLANTA ("FHLB") (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>091100 - Disclosure - JUNIOR SUBORDINATED DEBENTURES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://cecilbank.com/role/JuniorSubordinatedDebenturesDetails</Role>
      <ShortName>JUNIOR SUBORDINATED DEBENTURES (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>091200 - Disclosure - INCOME TAXES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://cecilbank.com/role/IncomeTaxesDetails</Role>
      <ShortName>INCOME TAXES (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>091300 - Disclosure - STOCKHOLDERS' EQUITY (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://cecilbank.com/role/StockholdersEquityDetails</Role>
      <ShortName>STOCKHOLDERS' EQUITY (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>091400 - Disclosure - REGULATORY MATTERS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://cecilbank.com/role/RegulatoryMattersDetails</Role>
      <ShortName>REGULATORY MATTERS (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>091500 - Disclosure - OFFICER, DIRECTOR AND EMPLOYEE BENEFIT PLANS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://cecilbank.com/role/OfficerDirectorAndEmployeeBenefitPlansDetails</Role>
      <ShortName>OFFICER, DIRECTOR AND EMPLOYEE BENEFIT PLANS (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>091600 - Disclosure - FINANCIAL INSTRUMENTS WITH OFF-BALANCE-SHEET RISK (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://cecilbank.com/role/FinancialInstrumentsWithOffbalancesheetRiskDetails</Role>
      <ShortName>FINANCIAL INSTRUMENTS WITH OFF-BALANCE-SHEET RISK (Details)</ShortName>
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    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
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      <ReportType>Sheet</ReportType>
      <Role>http://cecilbank.com/role/EarningsPerShareDetails</Role>
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    <Report>
      <IsDefault>false</IsDefault>
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      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>091800 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://cecilbank.com/role/FairValueOfFinancialInstrumentsDetails</Role>
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    <Report>
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      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>091900 - Disclosure - ASSETS MEASURED AT FAIR VALUE (Details)</LongName>
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      <ShortName>ASSETS MEASURED AT FAIR VALUE (Details)</ShortName>
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    <Report>
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      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>092000 - Disclosure - CASH DIVIDENDS AND INTEREST ON JUNIOR SUBORDINATED DEBENTURES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://cecilbank.com/role/CashDividendsAndInterestOnJuniorSubordinatedDebenturesDetails</Role>
      <ShortName>CASH DIVIDENDS AND INTEREST ON JUNIOR SUBORDINATED DEBENTURES (Details)</ShortName>
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    <Report>
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      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>092100 - Disclosure - CECIL BANCORP, INC HOLDING COMPANY ONLY FINANCIAL INFORMATION (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://cecilbank.com/role/CecilBancorpIncHoldingCompanyOnlyFinancialInformationDetails</Role>
      <ShortName>CECIL BANCORP, INC HOLDING COMPANY ONLY FINANCIAL INFORMATION (Details)</ShortName>
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    <Report>
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      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
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  <Logs>
    <Log type="Info">Element cecb_NetProceedsFromIssuanceOfPreferredStockAndStockWarrants had a mix of decimals attribute values: -5 -3.</Log>
    <Log type="Info">Element cecb_ProceedsFromIssuanceOfPreferredStockAndStockWarrants had a mix of decimals attribute values: -5 -3 0.</Log>
    <Log type="Info">Element us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance had a mix of decimals attribute values: 0 3.</Log>
    <Log type="Info">Element us-gaap_PreferredStockLiquidationPreference had a mix of decimals attribute values: 0 1 2.</Log>
    <Log type="Info">'Monetary' elements on report '090400 - Disclosure - INVESTMENT SECURITIES (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '090600 - Disclosure - SERVICING (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '090700 - Disclosure - PREMISES AND EQUIPMENT (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '090800 - Disclosure - ASSETS HELD FOR SALE (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '090900 - Disclosure - DEPOSITS (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '091000 - Disclosure - ADVANCES FROM FEDERAL HOME LOAN BANK OF ATLANTA ("FHLB") (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '091400 - Disclosure - REGULATORY MATTERS (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: 010100 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)</Log>
    <Log type="Info">Process Flow-Through: 020000 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Sep. 30, 2012'</Log>
    <Log type="Info">Process Flow-Through: 030100 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical)</Log>
    <Log type="Info">Process Flow-Through: 040000 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</Log>
  </Logs>
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    <File>cecb-20121231.xsd</File>
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    <File>cecb-20121231_def.xml</File>
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  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
