XML 99 R84.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Long Term Restricted Stock Units (Details) - 2009 International Bancshares Corporation Long-Term Restricted Stock Unit Plan | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2009 item | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2010 USD ($) | Dec. 31, 2009 USD ($)
CPP-compliant long-term RSUs |  |  |  |  |  |  |
Long-Term Restricted Stock Units |  |  |  |  |  |  |
Restricted stock compensation limit as a percentage to the total annual compensation of the President |  |  | 33.00% |  |  |  |
CPP-compliant long-term RSUs granted for performance in 2012 |  |  |  |  |  |  |
Long-Term Restricted Stock Units |  |  |  |  |  |  |
Compensation cost |  |  |  | $ 425,000 |  |  |
CPP-compliant long-term RSUs granted for performance in 2011 |  |  |  |  |  |  |
Long-Term Restricted Stock Units |  |  |  |  |  |  |
Compensation cost |  |  |  |  | $ 400,000 |  |
Cash amounts paid on vesting of awards |  | $ 572,746 |  |  |  |  |
CPP-compliant long-term RSUs granted for performance in 2010 |  |  |  |  |  |  |
Long-Term Restricted Stock Units |  |  |  |  |  |  |
Compensation cost |  |  |  |  |  | $ 400,000 |
Cash amounts paid on vesting of awards |  |  |  | 358,782 |  |  |
CPP-compliant long-term RSUs granted for performance in 2009 |  |  |  |  |  |  |
Long-Term Restricted Stock Units |  |  |  |  |  |  |
Compensation cost |  |  |  |  |  |  | $ 250,000
Cash amounts paid on vesting of awards |  |  | $ 591,344 | $ 262,842 |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |
Long-Term Restricted Stock Units |  |  |  |  |  |  |
Minimum number of non-employee members of the Board needed to authorize restricted stock units | item | 2 |  |  |  |  |  |

X
- 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
Name: | iboc_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfRSUToTotalCompensationLimit
Namespace Prefix: | iboc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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. + Details
Name: | iboc_ShareBasedCompensationArrangementByShareBasedPaymentMinimumNumberOfNonEmployeeBoardMembersToAuthorizeRSUs
Namespace Prefix: | iboc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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
Name: | us-gaap_EmployeeServiceShareBasedCompensationCashFlowEffectCashUsedToSettleAwards
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PlanNameAxis=iboc_InternationalBancsharesCorporationLongTermRestrictedStockUnitPlan2009Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | iboc_CPPStatusAxis=iboc_CPPCompliantLongTermRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | iboc_CPPStatusAxis=iboc_CPPCompliantLongTermRSUGrantedForPerformanceIn2012Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | iboc_CPPStatusAxis=iboc_CPPCompliantLongTermRSUGrantedForPerformanceIn2011Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | iboc_CPPStatusAxis=iboc_CPPCompliantLongTermRSUGrantedForPerformanceIn2010Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | iboc_CPPStatusAxis=iboc_CPPCompliantLongTermRSUGrantedForPerformanceIn2009Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |