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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, 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 | $ 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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