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International Bancshares Corporation (Parent Company Only) Financial Information Statements of Income (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income: |  |  |
Other interest income | $ 191 us-gaap_OtherInterestAndDividendIncome | $ 115 us-gaap_OtherInterestAndDividendIncome | $ 503 us-gaap_OtherInterestAndDividendIncome
Expenses: |  |  |
Interest expense (Debentures) | 4,264 us-gaap_InterestExpenseJuniorSubordinatedDebentures | 4,665 us-gaap_InterestExpenseJuniorSubordinatedDebentures | 6,595 us-gaap_InterestExpenseJuniorSubordinatedDebentures
Income before federal income taxes and equity in undistributed net income of subsidiaries | 229,938 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 182,590 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 158,400 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense (benefit) | 76,787 us-gaap_IncomeTaxExpenseBenefit | 56,239 us-gaap_IncomeTaxExpenseBenefit | 50,565 us-gaap_IncomeTaxExpenseBenefit
Net income | 153,151 us-gaap_NetIncomeLoss | 126,351 us-gaap_NetIncomeLoss | 107,835 us-gaap_NetIncomeLoss
Preferred stock dividends and discount accretion |  |  | 14,362 us-gaap_PreferredStockDividendsIncomeStatementImpact
Net income available to common shareholders | 153,151 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 126,351 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 93,473 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Parent Company |  |  |
Income: |  |  |
Dividends from subsidiaries | 71,389 iboc_DividendIncomeFromSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 30,000 iboc_DividendIncomeFromSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 229,250 iboc_DividendIncomeFromSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest income on notes receivable | 15 iboc_InterestIncomeNotesReceivable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 18 iboc_InterestIncomeNotesReceivable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 27 iboc_InterestIncomeNotesReceivable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest income on other investments | 6,862 us-gaap_InterestAndDividendIncomeSecuritiesAvailableForSale / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 12,301 us-gaap_InterestAndDividendIncomeSecuritiesAvailableForSale / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 6,759 us-gaap_InterestAndDividendIncomeSecuritiesAvailableForSale / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other interest income |  |  | 18 us-gaap_OtherInterestAndDividendIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other | 1,923 us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 26 us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 686 us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total income | 80,189 iboc_TotalIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 42,345 iboc_TotalIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 236,740 iboc_TotalIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Expenses: |  |  |
Interest expense (Debentures) | 4,264 us-gaap_InterestExpenseJuniorSubordinatedDebentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4,665 us-gaap_InterestExpenseJuniorSubordinatedDebentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 6,595 us-gaap_InterestExpenseJuniorSubordinatedDebentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other | 1,099 us-gaap_OtherExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,889 us-gaap_OtherExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,867 us-gaap_OtherExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total expenses | 5,363 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 6,554 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 10,462 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income before federal income taxes and equity in undistributed net income of subsidiaries | 74,826 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 35,791 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 226,278 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income tax expense (benefit) | 1,370 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,529 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (738)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income before equity in undistributed net income of subsidiaries | 73,456 iboc_IncomeLossFromContinuingOperationsAfterIncomeTaxesAndBeforeMinorityInterestIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 33,262 iboc_IncomeLossFromContinuingOperationsAfterIncomeTaxesAndBeforeMinorityInterestIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 227,016 iboc_IncomeLossFromContinuingOperationsAfterIncomeTaxesAndBeforeMinorityInterestIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity in undistributed (distributed) net income of subsidiaries | 79,695 iboc_IncomeLossFromInvestmentsInSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 93,089 iboc_IncomeLossFromInvestmentsInSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (119,181)iboc_IncomeLossFromInvestmentsInSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income | 153,151 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 126,351 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 107,835 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Preferred stock dividends and discount accretion |  |  | 14,362 us-gaap_PreferredStockDividendsIncomeStatementImpact / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income available to common shareholders | $ 153,151 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 126,351 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 93,473 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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