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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
	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%

X

- Definition

Represents the limit of the restricted stock unit compensation as a percentage to the total annual compensation of the awardee.

+ References

No definition available.

+ Details

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X

- 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.

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- Definition

Equity-based compensation cost during the period with respect to the award, which will be recognized in income (as well as the total recognized tax benefit) or capitalized as part of the cost of an asset.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.



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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.



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