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Consolidated Statements of Income (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Interest income:    
Loans, including fees $ 72,443,000us-gaap_InterestAndFeeIncomeLoansAndLeases $ 67,872,000us-gaap_InterestAndFeeIncomeLoansAndLeases
Investment securities:    
Taxable 23,883,000us-gaap_InterestIncomeSecuritiesTaxable 26,179,000us-gaap_InterestIncomeSecuritiesTaxable
Tax-exempt 2,773,000us-gaap_InterestIncomeSecuritiesTaxExempt 3,523,000us-gaap_InterestIncomeSecuritiesTaxExempt
Other interest income 36,000us-gaap_OtherInterestAndDividendIncome 63,000us-gaap_OtherInterestAndDividendIncome
Total interest income 99,135,000us-gaap_InterestAndDividendIncomeOperating 97,637,000us-gaap_InterestAndDividendIncomeOperating
Interest expense:    
Savings deposits 877,000us-gaap_InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDeposits 871,000us-gaap_InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDeposits
Time deposits 2,874,000us-gaap_InterestExpenseTimeDeposits 3,120,000us-gaap_InterestExpenseTimeDeposits
Securities sold under repurchase agreements 5,994,000us-gaap_InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase 6,236,000us-gaap_InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase
Other borrowings 475,000iboc_InterestExpenseOtherBorrowings 556,000iboc_InterestExpenseOtherBorrowings
Junior subordinated interest deferrable debentures 1,024,000us-gaap_InterestExpenseJuniorSubordinatedDebentures 1,090,000us-gaap_InterestExpenseJuniorSubordinatedDebentures
Total interest expense 11,244,000us-gaap_InterestExpense 11,873,000us-gaap_InterestExpense
Net interest income 87,891,000us-gaap_InterestIncomeExpenseNet 85,764,000us-gaap_InterestIncomeExpenseNet
Provision for probable loan losses 2,377,000us-gaap_ProvisionForLoanAndLeaseLosses 2,078,000us-gaap_ProvisionForLoanAndLeaseLosses
Net interest income after provision for probable loan losses 85,514,000us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss 83,686,000us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss
Non-interest income:    
Service charges on deposit accounts 19,192,000us-gaap_FeesAndCommissionsDepositorAccounts 22,062,000us-gaap_FeesAndCommissionsDepositorAccounts
Other service charges, commissions and fees    
Banking 10,453,000iboc_ServiceChargesFeesAndCommissionsOtherBanking 10,820,000iboc_ServiceChargesFeesAndCommissionsOtherBanking
Non-banking 1,110,000us-gaap_FeesAndCommissionsOther 1,899,000us-gaap_FeesAndCommissionsOther
Investment securities transactions, net (1,000)us-gaap_GainLossOnSaleOfSecuritiesNet 8,108,000us-gaap_GainLossOnSaleOfSecuritiesNet
Other investments, net 4,255,000us-gaap_NoninterestIncomeOther 9,058,000us-gaap_NoninterestIncomeOther
Other income 1,825,000us-gaap_NoninterestIncomeOtherOperatingIncome 6,239,000us-gaap_NoninterestIncomeOtherOperatingIncome
Total non-interest income 36,834,000us-gaap_NoninterestIncome 58,186,000us-gaap_NoninterestIncome
Non-interest expense:    
Employee compensation and benefits 31,752,000us-gaap_LaborAndRelatedExpense 30,245,000us-gaap_LaborAndRelatedExpense
Occupancy 6,179,000us-gaap_OccupancyNet 7,008,000us-gaap_OccupancyNet
Depreciation of bank premises and equipment 6,226,000us-gaap_DepreciationNonproduction 6,092,000us-gaap_DepreciationNonproduction
Professional fees 3,247,000us-gaap_ProfessionalFees 3,612,000us-gaap_ProfessionalFees
Deposit insurance assessments 1,490,000us-gaap_FederalDepositInsuranceCorporationPremiumExpense 1,439,000us-gaap_FederalDepositInsuranceCorporationPremiumExpense
Net expense, other real estate owned 1,468,000us-gaap_OtherRevenueExpenseFromRealEstateOperations 929,000us-gaap_OtherRevenueExpenseFromRealEstateOperations
Amortization of identified intangible assets 119,000us-gaap_AmortizationOfIntangibleAssets 981,000us-gaap_AmortizationOfIntangibleAssets
Advertising 2,007,000us-gaap_AdvertisingExpense 1,830,000us-gaap_AdvertisingExpense
Early termination fee - securities sold under repurchase agreements   11,000,000iboc_PrepaymentPenaltyOnSecuritiesSoldUnderRepurchaseAgreement
Impairment charges (Total other-than-temporary impairment charges, $122 net of $(349), and $32, net of $(122), included in other comprehensive income) 227,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet 90,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
Other 14,908,000us-gaap_OtherNoninterestExpense 14,470,000us-gaap_OtherNoninterestExpense
Total non-interest expense 67,623,000us-gaap_NoninterestExpense 77,696,000us-gaap_NoninterestExpense
Income before income taxes 54,725,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 64,176,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Provision for income taxes 18,863,000us-gaap_IncomeTaxExpenseBenefit 20,530,000us-gaap_IncomeTaxExpenseBenefit
Net income $ 35,862,000us-gaap_NetIncomeLoss $ 43,646,000us-gaap_NetIncomeLoss
Basic earnings per common share:    
Weighted average number of shares outstanding: (in shares) 66,416,252us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 67,130,971us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Net income (in dollars per share) $ 0.54us-gaap_EarningsPerShareBasic $ 0.65us-gaap_EarningsPerShareBasic
Fully diluted earnings per common share:    
Weighted average number of shares outstanding: (in shares) 66,555,392us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 67,272,299us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income (in dollars per share) $ 0.54us-gaap_EarningsPerShareDiluted $ 0.65us-gaap_EarningsPerShareDiluted