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Income Taxes (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets:
Loans receivable, principally due to the allowance for probable loan losses	$ 24,849us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	$ 25,365us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses
Other real estate owned	3,453iboc_DeferredTaxAssetsOtherRealEstateOwned	3,878iboc_DeferredTaxAssetsOtherRealEstateOwned
Impairment charges on available-for-sale securities	5,618us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses	5,327us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses
Accrued expenses	268us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	399us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Net unrealized gains on available for sale investment securities		24,235iboc_DeferredTaxAssetsUnrealizedGainsOnAvailableForSaleSecurities
Other	5,809us-gaap_DeferredTaxAssetsOther	4,816us-gaap_DeferredTaxAssetsOther
Total deferred tax assets	39,997us-gaap_DeferredTaxAssetsGross	64,020us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities:
Bank premises and equipment, principally due to differences on depreciation	(18,314)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment	(20,729)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Net unrealized gains on available for sale investment securities	(6,182)us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome
Identified intangible assets and goodwill	(18,787)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets	(18,051)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets
Other	(12,303)us-gaap_DeferredTaxLiabilitiesOther	(11,476)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities	(55,586)us-gaap_DeferredTaxLiabilities	(50,256)us-gaap_DeferredTaxLiabilities
Net deferred tax asset (liability)	$ (15,589)us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 13,764us-gaap_DeferredTaxAssetsLiabilitiesNet

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