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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 | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended
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Dec. 31, 2012 CPP-compliant long-term RSUs | Dec. 31, 2012 CPP-compliant long-term RSUs granted for performance in 2012 | Dec. 31, 2013 CPP-compliant long-term RSUs granted for performance in 2011 | Dec. 31, 2011 CPP-compliant long-term RSUs granted for performance in 2011 | Dec. 31, 2012 CPP-compliant long-term RSUs granted for performance in 2010 | Dec. 31, 2010 CPP-compliant long-term RSUs granted for performance in 2010 | Dec. 31, 2012 CPP-compliant long-term RSUs granted for performance in 2009 | Dec. 31, 2009 CPP-compliant long-term RSUs granted for performance in 2009 | 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% |  |  |  |  |  |  |  |
Cash amounts paid on vesting of awards |  |  | $ 591,344 |  | $ 358,782 |  | $ 262,842 |  |

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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 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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- Definition Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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