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Bank Call Loans - Summary of Bank Call Loans (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Schedule Of Bank Call Loans [Line Items] |  |
Year-end balance | $ 128,300 | $ 27,500
Weighted interest rate (at end of year) | 1.23% | 1.25%
Maximum balance (at any month end) | 171,400 | 178,600
Average amount outstanding (during the year) | $ 73,227 | $ 92,657
Average interest rate (during the year) | 1.27% | 1.25%

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- Definition Average Interest Rates + References No definition available. + Details
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- Definition Bank Call Loans Average Amount Outstanding During Year + References No definition available. + Details
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Balance Type: | credit
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- Definition Bank Loans Maximum Balance At Any Month End + References No definition available. + Details
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Balance Type: | credit
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- Details
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- Definition Weighted Average Interest Rate + References No definition available. + Details
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- Definition Amounts due on short-term bank loans secured by customers' securities on the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Paragraph 43, 44 -IssueDate 2006-05-01 -Chapter 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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