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Long Term Restricted Stock Units (Details) (2009 International Bancshares Corporation Long-Term Restricted Stock Unit Plan, USD $) | 12 Months Ended | 1 Months Ended
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Dec. 31, 2012 CPP-compliant long-term RSUs | Dec. 31, 2011 CPP-compliant long-term RSUs | Dec. 31, 2010 CPP-compliant long-term RSUs | Dec. 31, 2009 CPP-compliant long-term RSUs | Dec. 31, 2009 Restricted Stock Units (RSUs) member
Long-Term Restricted Stock Units |  |  |  |  |
Minimum number of non-employee members of the Board needed to authorize restricted stock units |  |  |  |  | 2
Compensation cost | $ 425,000 | $ 400,000 | $ 400,000 | $ 250,000 |
Restricted stock compensation limit as a percentage to the total annual compensation of the President |  | 33.00% |  |  |

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- Definition Represents the limit of the restricted stock unit compensation as a percentage to the total annual compensation of the award. + References No definition available. + Details
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- Definition The minimum number of non-employee members of the Board authorized to issue restricted stock units. The members are appointed by the Board each of whom is both a non-employee director and an outside director. + References No definition available. + Details
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- Definition Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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