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

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