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      <LongName>090600 - Disclosure - Corporate Premises and Equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
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      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>090700 - Disclosure - Time Deposits (Details)</LongName>
      <ReportType>Sheet</ReportType>
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    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>090800 - Disclosure - Borrowings, Short-term (Details)</LongName>
      <ReportType>Sheet</ReportType>
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    <Report>
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      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
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      <ReportType>Sheet</ReportType>
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      <HtmlFileName>R63.htm</HtmlFileName>
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      <ReportType>Sheet</ReportType>
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      <ReportType>Sheet</ReportType>
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      <LongName>091300 - Disclosure - Share-Based Plans (Details)</LongName>
      <ReportType>Sheet</ReportType>
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      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>091400 - Disclosure - Regulatory Requirements and Restrictions (Details)</LongName>
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      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>091500 - Disclosure - Commitments and Financial Instruments with Off-Balance-Sheet Risk (Details)</LongName>
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      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>091600 - Disclosure - Fair Value of Assets and Liabilities (Details)</LongName>
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      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>091602 - Disclosure - Fair Value of Assets and Liabilities, Fair Value of Financial Instruments (Details)</LongName>
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      <ShortName>Fair Value of Assets and Liabilities, Fair Value of Financial Instruments (Details)</ShortName>
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      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>091700 - Disclosure - Business Segments (Details)</LongName>
      <ReportType>Sheet</ReportType>
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      <HtmlFileName>R73.htm</HtmlFileName>
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      <ShortName>Derivative Financial Instruments (Details)</ShortName>
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      <HtmlFileName>R74.htm</HtmlFileName>
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      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>092000 - Disclosure - Other Noninterest Expenses (Details)</LongName>
      <ReportType>Sheet</ReportType>
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      <ShortName>Other Noninterest Expenses (Details)</ShortName>
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      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>092100 - Disclosure - Quarterly Condensed Statements of Income-Unaudited (Details)</LongName>
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      <ShortName>Quarterly Condensed Statements of Income-Unaudited (Details)</ShortName>
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    <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: Removing column 'Dec. 31, 2010'</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2009'</Log>
    <Log type="Info">Process Flow-Through: 020000 - Statement - CONSOLIDATED STATEMENTS OF INCOME</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 INCOME</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 SHAREHOLDERS' EQUITY (Parenthetical)</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: 050000 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</Log>
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