$IBOC
International Bancshares Corp Stock $iboc

$iboc Overview Financials Valuation SEC Filings Company Website

2011 Q4 Form 10-K Financial Statement

#000104746913001618 Filed on February 25, 2013

Income Statement

Concept	2011 Q4	2010	2009 Q4
Revenue		$458.8M
YoY Change
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$11.50M	$40.70M	$10.20M
YoY Change	15.0%	-1.21%	-6.42%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense		$114.0M
YoY Change
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$45.50M	$201.0M	$59.10M
YoY Change	-14.63%	-8.94%	21.36%
Income Tax	$15.20M	$70.96M	$22.00M
% Of Pretax Income	33.41%	35.31%	37.23%
Net Earnings	$30.40M	$130.0M	$37.10M
YoY Change	0.0%	-8.88%	17.03%
Net Earnings / Revenue		28.34%
Basic Earnings Per Share		$1.72
Diluted Earnings Per Share	$451.7K	$1.72	$544.0K
COMMON SHARES
Basic Shares Outstanding		67.92M shares
Diluted Shares Outstanding		68.00M shares

Balance Sheet

Concept	2011 Q4	2010	2009 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$5.478B
YoY Change
Cash & Equivalents	$261.9M		$224.6M
Short-Term Investments	$5.216B
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$453.1M	$469.0M	$490.0M
YoY Change	-3.4%	-4.29%	5.15%
Goodwill	$282.5M
YoY Change
Intangibles	$12.19M
YoY Change
Long-Term Investments
YoY Change
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$11.74B	$11.94B	$11.76B
YoY Change	-1.7%	1.53%	-5.43%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$1.349B	$1.433B	$1.442B
YoY Change	-5.86%	-0.62%	0.07%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$1.349B	$1.433B	$1.442B
YoY Change	-5.86%	-0.62%	0.07%
LONG-TERM LIABILITIES
Long-Term Debt	$191.0M	$201.0M	$201.0M
YoY Change	-4.98%	0.0%	0.0%
Other Long-Term Liabilities	$160.0M	$224.0M	$187.0M
YoY Change	-28.57%	19.79%	18.35%
Total Long-Term Liabilities	$351.0M	$425.0M	$388.0M
YoY Change	-17.41%	9.54%	8.08%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.349B	$1.433B	$1.442B
Total Long-Term Liabilities	$351.0M	$425.0M	$388.0M
Total Liabilities	$10.14B	$10.48B	$10.36B
YoY Change	-3.29%	1.25%	-7.4%
SHAREHOLDERS EQUITY
Retained Earnings	$1.303B
YoY Change
Common Stock	$95.72M
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)	$256.8M
YoY Change
Treasury Stock Shares	28.44M shares
Shareholders Equity	$1.600B	$1.459B	$1.407B
YoY Change
Total Liabilities & Shareholders Equity	$11.74B	$11.94B	$11.76B
YoY Change	-1.7%	1.53%	-5.43%

Cashflow Statement

Concept	2011 Q4	2010	2009 Q4
OPERATING ACTIVITIES
Net Income	$30.40M	$130.0M	$37.10M
YoY Change	0.0%	-8.88%	17.03%
Depreciation, Depletion And Amortization	$11.50M	$40.70M	$10.20M
YoY Change	15.0%	-1.21%	-6.42%
Cash From Operating Activities	-$16.00M	$178.2M	$82.80M
YoY Change	-218.52%	19.52%	247.9%
INVESTING ACTIVITIES
Capital Expenditures	-$7.100M	$15.95M	-$8.800M
YoY Change	42.0%	-126.02%	-60.36%
Acquisitions
YoY Change
Other Investing Activities	-$19.60M	-$239.3M	-$511.5M
YoY Change	-90.47%	-132.64%	-47.4%
Cash From Investing Activities	-$26.80M	-$255.4M	-$520.2M
YoY Change	-87.26%	-138.01%	-47.69%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		$6.949M
YoY Change		-174.72%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	75.10M	50.50M	409.8M
YoY Change	-58.51%	-105.64%	-55.57%
NET CHANGE
Cash From Operating Activities	-16.00M	178.2M	82.80M
Cash From Investing Activities	-26.80M	-255.4M	-520.2M
Cash From Financing Activities	75.10M	50.50M	409.8M
Net Change In Cash	32.30M	-26.70M	-27.60M
YoY Change	-303.14%	-63.92%	-42.86%
FREE CASH FLOW
Cash From Operating Activities	-$16.00M	$178.2M	$82.80M
Capital Expenditures	-$7.100M	$15.95M	-$8.800M
Free Cash Flow	-$8.900M	$162.2M	$91.60M
YoY Change	-148.11%	-22.89%	99.13%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2012	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2012	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2012	dei	Entity Central Index Key EntityCentralIndexKey	0000315709
CY2012	dei	Document Type DocumentType	10-K
CY2012	dei	Document Period End Date DocumentPeriodEndDate	2012-12-31
CY2012	dei	Amendment Flag AmendmentFlag	false
CY2012	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2012Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	5525015000	USD
CY2012	iboc	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Net Of Reclassification Adjustment OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringNetOfReclassificationAdjustment	-19297000	USD
CY2010	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.36
CY2011	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.38
CY2012	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.40
CY2012	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2012
CY2012	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2012	dei	Entity Registrant Name EntityRegistrantName	INTERNATIONAL BANCSHARES CORP
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CY2012Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	2400000	USD
CY2011Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	2450000	USD
CY2011Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	5213915000	USD
CY2012Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	283100000	USD
CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	261885000	USD
CY2012Q4	us-gaap	Marketable Securities MarketableSecurities	5527415000	USD
CY2011Q4	us-gaap	Marketable Securities MarketableSecurities	5216365000	USD
CY2012Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	4775004000	USD
CY2011Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	5053475000	USD
CY2012Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	58193000	USD
CY2012Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	4716811000	USD
CY2011Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	4969283000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	481287000	USD
CY2012Q4	us-gaap	Interest Receivable InterestReceivable	31034000	USD
CY2011Q4	us-gaap	Interest Receivable InterestReceivable	32002000	USD
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CY2012Q4	us-gaap	Preferred Stock Liquidation Preference PreferredStockLiquidationPreference	1000
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CY2012Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
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CY2012	us-gaap	Advertising Expense AdvertisingExpense	7017000	USD
CY2011	us-gaap	Advertising Expense AdvertisingExpense	5807000	USD
CY2010	us-gaap	Advertising Expense AdvertisingExpense	7716000	USD
CY2010	iboc	Litigation Expense LitigationExpense	21837000	USD
CY2012	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet	1039000	USD
CY2011	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet	977000	USD
CY2010	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet	8416000	USD
CY2012	us-gaap	Other Noninterest Expense OtherNoninterestExpense	60703000	USD
CY2011	us-gaap	Other Noninterest Expense OtherNoninterestExpense	68174000	USD
CY2010	us-gaap	Other Noninterest Expense OtherNoninterestExpense	65044000	USD
CY2012	us-gaap	Noninterest Expense NoninterestExpense	315372000	USD
CY2011	us-gaap	Noninterest Expense NoninterestExpense	316774000	USD
CY2010	us-gaap	Noninterest Expense NoninterestExpense	339725000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	158400000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	191227000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	200980000	USD
CY2012	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	50565000	USD
CY2011	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	64078000	USD
CY2010	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	70957000	USD
CY2012	us-gaap	Net Income Loss NetIncomeLoss	107835000	USD
CY2011	us-gaap	Net Income Loss NetIncomeLoss	127149000	USD
CY2010	us-gaap	Net Income Loss NetIncomeLoss	130023000	USD
CY2012	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	14362000	USD
CY2011	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	13280000	USD
CY2010	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	13126000	USD
CY2012	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	93473000	USD
CY2011	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	113869000	USD
CY2010	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	116897000	USD
CY2012	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	67236681	shares
CY2011	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	67506554	shares
CY2010	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	67921353	shares
CY2012	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.39
CY2011	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.69
CY2010	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.72
CY2012	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	67313963	shares
CY2011	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	67569468	shares
CY2010	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	68004441	shares
CY2012	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.39
CY2011	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.69
CY2010	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.72
CY2011	iboc	Other Than Temporary Impairment Losses Investment Portion Recognized In Earnings Net OtherThanTemporaryImpairmentLossesInvestmentPortionRecognizedInEarningsNet	-1003000	USD
CY2010	iboc	Other Than Temporary Impairment Losses Investment Portion Recognized In Earnings Net OtherThanTemporaryImpairmentLossesInvestmentPortionRecognizedInEarningsNet	-19070000	USD
CY2012	iboc	Other Than Temporary Impairment Losses Investment Portion Recognized In Earnings Net OtherThanTemporaryImpairmentLossesInvestmentPortionRecognizedInEarningsNet	-916000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-123000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	26000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	10654000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	66782000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-20985000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	-11235000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	-21586000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Writedown Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForWritedownOfSecuritiesIncludedInNetIncomeNetOfTax	635000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Writedown Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForWritedownOfSecuritiesIncludedInNetIncomeNetOfTax	5470000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	92922000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	56182000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	2701000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	35960000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-11300000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeTax	-13456000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeTax	-6050000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeTax	-11623000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Write Down Of Securities Included In Net Income Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForWriteDownOfSecuritiesIncludedInNetIncomeTax	364000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Write Down Of Securities Included In Net Income Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForWriteDownOfSecuritiesIncludedInNetIncomeTax	342000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Write Down Of Securities Included In Net Income Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForWriteDownOfSecuritiesIncludedInNetIncomeTax	2946000	USD
CY2012	iboc	Entity Number Of Insurance Related Subsidiaries EntityNumberOfInsuranceRelatedSubsidiaries	2	item
CY2012	iboc	Number Of Components Other Than Temporary Impairment Segregated NumberOfComponentsOtherThanTemporaryImpairmentSegregated	2	item
CY2012	iboc	Period Of Charge Off For Past Due Unsecured Commercial Loans PeriodOfChargeOffForPastDueUnsecuredCommercialLoans	P90D
CY2011Q4	iboc	Other Real Estate And Foreclosed Assets In Use OtherRealEstateAndForeclosedAssetsInUse	86626000	USD
CY2012Q4	iboc	Other Real Estate And Foreclosed Assets In Use OtherRealEstateAndForeclosedAssetsInUse	100106000	USD
CY2012	iboc	Percentage Of Likelihood Of Realization Of Recognized Tax Benefit PercentageOfLikelihoodOfRealizationOfRecognizedTaxBenefit	0.50	pure
CY2012	iboc	Number Of Active Operating Subsidiaries NumberOfActiveOperatingSubsidiaries	4	item
CY2012	iboc	Maximum Term Of Maturity To Classify Short Term Investments As Cash Equivalents MaximumTermOfMaturityToClassifyShortTermInvestmentsAsCashEquivalents	P3M
CY2012	iboc	Minimum Period For Past Due Unsecured Loans Outstanding Not Placed On Non Accrual Status Under Special Circumstances MinimumPeriodForPastDueUnsecuredLoansOutstandingNotPlacedOnNonAccrualStatusUnderSpecialCircumstances	P90D
CY2012	iboc	Maximum Period Outstanding Non Consumer Loans Are Evaluated For Non Accrual Status MaximumPeriodOutstandingNonConsumerLoansAreEvaluatedForNonAccrualStatus	P90D
CY2011Q4	us-gaap	Held To Maturity Securities Amortized Cost Before Other Than Temporary Impairment HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment	2450000	USD
CY2012Q4	us-gaap	Held To Maturity Securities Amortized Cost Before Other Than Temporary Impairment HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment	2400000	USD
CY2011Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	143760000	USD
CY2011Q4	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	11940000	USD
CY2011Q4	us-gaap	Available For Sale Securities Fair Value Disclosure AvailableForSaleSecuritiesFairValueDisclosure	5213915000	USD
CY2012Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	119670000	USD
CY2012Q4	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	17844000	USD
CY2012Q4	us-gaap	Available For Sale Securities Fair Value Disclosure AvailableForSaleSecuritiesFairValueDisclosure	5525015000	USD
CY2012Q4	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount	1200000	USD
CY2012Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount	1200000	USD
CY2012Q4	us-gaap	Held To Maturity Securities Debt Maturities Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesNetCarryingAmount	2400000	USD
CY2012Q4	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Fair Value HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue	1200000	USD
CY2012Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	1200000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	7819000	USD
CY2011Q4	us-gaap	Noninterest Bearing Deposit Liabilities Domestic NoninterestBearingDepositLiabilitiesDomestic	1717286000	USD
CY2011Q4	us-gaap	Noninterest Bearing Deposit Liabilities Foreign NoninterestBearingDepositLiabilitiesForeign	209732000	USD
CY2011Q4	us-gaap	Interest Bearing Deposit Liabilities Domestic InterestBearingDepositLiabilitiesDomestic	2221758000	USD
CY2011Q4	us-gaap	Interest Bearing Deposit Liabilities Foreign InterestBearingDepositLiabilitiesForeign	485935000	USD
CY2011Q4	us-gaap	Time Deposits100000 Or More Domestic TimeDeposits100000OrMoreDomestic	1022450000	USD
CY2011Q4	us-gaap	Time Deposits100000 Or More Foreign TimeDeposits100000OrMoreForeign	1244018000	USD
CY2011Q4	iboc	Time Deposits Less Than100000 Domestic TimeDepositsLessThan100000Domestic	664111000	USD
CY2011Q4	iboc	Time Deposits Less Than100000 Foreign TimeDepositsLessThan100000Foreign	380802000	USD
CY2011	iboc	Interest Expense Now Accounts Money Market Accounts And Savings Deposit Domestic InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDepositDomestic	6549000	USD
CY2011	iboc	Interest Expense Now Accounts Money Market Accounts And Savings Deposit Foreign InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDepositForeign	1234000	USD
CY2010	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	1149021000	USD
CY2012	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	1382231000	USD
CY2011	us-gaap	Proceeds From Sale Of Mortgage Backed Securities Mbs Categorized As Available For Sale ProceedsFromSaleOfMortgageBackedSecuritiesMBSCategorizedAsAvailableForSale	1095815000	USD
CY2010	us-gaap	Proceeds From Sale Of Mortgage Backed Securities Mbs Categorized As Available For Sale ProceedsFromSaleOfMortgageBackedSecuritiesMBSCategorizedAsAvailableForSale	1133610000	USD
CY2012	us-gaap	Proceeds From Sale Of Mortgage Backed Securities Mbs Categorized As Available For Sale ProceedsFromSaleOfMortgageBackedSecuritiesMBSCategorizedAsAvailableForSale	1338723000	USD
CY2012	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	38447000	USD
CY2011	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	17318000	USD
CY2010	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	33223000	USD
CY2012	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	1000	USD
CY2011	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	33000	USD
CY2010	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	14000	USD
CY2012Q4	us-gaap	Held To Maturity Securities Debt Maturities Fair Value HeldToMaturitySecuritiesDebtMaturitiesFairValue	2400000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	674000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	216288000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost	5186652000	USD
CY2012Q4	us-gaap	Available For Sale Equity Securities Amortized Cost Basis AvailableForSaleEquitySecuritiesAmortizedCostBasis	19575000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	765000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	237910000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue	5265204000	USD
CY2012Q4	us-gaap	Available For Sale Securities Equity Securities AvailableForSaleSecuritiesEquitySecurities	21136000	USD
CY2012Q4	iboc	Available For Sale Securities Pledged As Collateral Amortized Cost AvailableForSaleSecuritiesPledgedAsCollateralAmortizedCost	2323648000	USD
CY2012Q4	us-gaap	Available For Sale Securities Pledged As Collateral AvailableForSaleSecuritiesPledgedAsCollateral	2393435000	USD
CY2011	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	1102849000	USD
CY2011Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	13016000	USD
CY2011Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses2	331000	USD
CY2011Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	43045000	USD
CY2011Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses2	11609000	USD
CY2011Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	56061000	USD
CY2011Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses2	11940000	USD
CY2012Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	743609000	USD
CY2012Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses2	5590000	USD
CY2012Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	43353000	USD
CY2012Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses2	12254000	USD
CY2012Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	786962000	USD
CY2012Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses2	17844000	USD
CY2011	iboc	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net After Tax OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAfterTax	635000	USD
CY2012	iboc	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net After Tax OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAfterTax	675000	USD
CY2011Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	329680000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	453050000	USD
CY2012Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	340134000	USD
CY2011Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	60417000	USD
CY2011Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	48227000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	60697000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	52878000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	4633000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	2389000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	452000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	295000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	25000	USD
CY2010	iboc	Interest Expense Now Accounts Money Market Accounts And Savings Deposit Domestic InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDepositDomestic	7771000	USD
CY2010	iboc	Interest Expense Now Accounts Money Market Accounts And Savings Deposit Foreign InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDepositForeign	1612000	USD
CY2010	us-gaap	Interest Expense Now Accounts Money Market Accounts And Savings Deposits InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDeposits	9383000	USD
CY2010	iboc	Interest Expense Time Deposits100000 Or More Domestic InterestExpenseTimeDeposits100000OrMoreDomestic	14839000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	25000	USD
CY2012	us-gaap	Interest Expense Deposits InterestExpenseDeposits	29261000	USD
CY2012Q4	us-gaap	Noninterest Bearing Deposit Liabilities Domestic NoninterestBearingDepositLiabilitiesDomestic	2002920000	USD
CY2012Q4	us-gaap	Noninterest Bearing Deposit Liabilities Foreign NoninterestBearingDepositLiabilitiesForeign	462830000	USD
CY2012Q4	us-gaap	Interest Bearing Deposit Liabilities Domestic InterestBearingDepositLiabilitiesDomestic	2350872000	USD
CY2012Q4	us-gaap	Interest Bearing Deposit Liabilities Foreign InterestBearingDepositLiabilitiesForeign	516279000	USD
CY2012Q4	us-gaap	Time Deposits100000 Or More Domestic TimeDeposits100000OrMoreDomestic	973824000	USD
CY2012Q4	us-gaap	Time Deposits100000 Or More Foreign TimeDeposits100000OrMoreForeign	1025089000	USD
CY2012Q4	iboc	Time Deposits Less Than100000 Domestic TimeDepositsLessThan100000Domestic	601766000	USD
CY2012Q4	iboc	Time Deposits Less Than100000 Foreign TimeDepositsLessThan100000Foreign	353633000	USD
CY2012Q4	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	2623178000	USD
CY2012	iboc	Allowance For Loan And Lease Losses Write Offs Net AllowanceForLoanAndLeaseLossesWriteOffsNet	53958000	USD
CY2012	us-gaap	Allowance For Loan And Lease Losses Provision For Loss Gross AllowanceForLoanAndLeaseLossesProvisionForLossGross	27959000	USD
CY2011Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	136305000	USD
CY2011Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	4917170000	USD
CY2011Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	56940000	USD
CY2012Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	83005000	USD
CY2011	us-gaap	Interest Expense Now Accounts Money Market Accounts And Savings Deposits InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDeposits	7783000	USD
CY2011	iboc	Interest Expense Time Deposits100000 Or More Domestic InterestExpenseTimeDeposits100000OrMoreDomestic	10299000	USD
CY2011	iboc	Interest Expense Time Deposits100000 Or More Foreign InterestExpenseTimeDeposits100000OrMoreForeign	11512000	USD
CY2011	iboc	Interest Expense Time Deposits Less Than100000 Domestic InterestExpenseTimeDepositsLessThan100000Domestic	7468000	USD
CY2011	iboc	Interest Expense Time Deposits Less Than100000 Foreign InterestExpenseTimeDepositsLessThan100000Foreign	2277000	USD
CY2011	us-gaap	Interest Expense Deposits InterestExpenseDeposits	39339000	USD
CY2012	iboc	Interest Expense Now Accounts Money Market Accounts And Savings Deposit Domestic InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDepositDomestic	4487000	USD
CY2012	iboc	Interest Expense Now Accounts Money Market Accounts And Savings Deposit Foreign InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDepositForeign	801000	USD
CY2012	us-gaap	Interest Expense Now Accounts Money Market Accounts And Savings Deposits InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDeposits	5288000	USD
CY2012	iboc	Interest Expense Time Deposits100000 Or More Domestic InterestExpenseTimeDeposits100000OrMoreDomestic	8263000	USD
CY2012	iboc	Interest Expense Time Deposits100000 Or More Foreign InterestExpenseTimeDeposits100000OrMoreForeign	9148000	USD
CY2012	iboc	Interest Expense Time Deposits Less Than100000 Domestic InterestExpenseTimeDepositsLessThan100000Domestic	4945000	USD
CY2012	iboc	Interest Expense Time Deposits Less Than100000 Foreign InterestExpenseTimeDepositsLessThan100000Foreign	1617000	USD
CY2012Q4	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	224606000	USD
CY2012Q4	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	72214000	USD
CY2012Q4	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	27437000	USD
CY2012Q4	us-gaap	Time Deposit Maturities After Year Five TimeDepositMaturitiesAfterYearFive	6478000	USD
CY2012Q4	us-gaap	Time Deposits Noncurrent TimeDepositsNoncurrent	399000	USD
CY2012Q4	us-gaap	Contractual Maturities Time Deposits100000 Or More Three Months Or Less ContractualMaturitiesTimeDeposits100000OrMoreThreeMonthsOrLess	718867000	USD
CY2012Q4	us-gaap	Contractual Maturities Time Deposits100000 Or More Three Months Through Six Months ContractualMaturitiesTimeDeposits100000OrMoreThreeMonthsThroughSixMonths	527526000	USD
CY2012Q4	us-gaap	Contractual Maturities Time Deposits100000 Or More Six Months Through12 Months ContractualMaturitiesTimeDeposits100000OrMoreSixMonthsThrough12Months	535414000	USD
CY2012Q4	us-gaap	Contractual Maturities Time Deposits100000 Or More After12 Months ContractualMaturitiesTimeDeposits100000OrMoreAfter12Months	217106000	USD
CY2012Q4	us-gaap	Time Deposits100000 Or More TimeDeposits100000OrMore	1998913000	USD
CY2011	iboc	Securities Sold Under Agreements To Repurchase Average Outstanding Amount SecuritiesSoldUnderAgreementsToRepurchaseAverageOutstandingAmount	1415769000	USD
CY2012	iboc	Securities Sold Under Agreements To Repurchase Average Outstanding Amount SecuritiesSoldUnderAgreementsToRepurchaseAverageOutstandingAmount	1276831000	USD
CY2011Q4	iboc	Securities Sold Under Agreements To Repurchase Maximum Outstanding Amount At Any Month End SecuritiesSoldUnderAgreementsToRepurchaseMaximumOutstandingAmountAtAnyMonthEnd	1437480000	USD
CY2012Q4	iboc	Securities Sold Under Agreements To Repurchase Maximum Outstanding Amount At Any Month End SecuritiesSoldUnderAgreementsToRepurchaseMaximumOutstandingAmountAtAnyMonthEnd	1412744000	USD
CY2011Q4	us-gaap	Assets Sold Under Agreements To Repurchase Carrying Amounts AssetsSoldUnderAgreementsToRepurchaseCarryingAmounts	1672925000	USD
CY2011Q4	us-gaap	Assets Sold Under Agreements To Repurchase Market Value AssetsSoldUnderAgreementsToRepurchaseMarketValue	1736519000	USD
CY2011Q4	us-gaap	Assets Sold Under Agreements To Repurchase Interest Rate AssetsSoldUnderAgreementsToRepurchaseInterestRate	0.0302	pure
CY2012Q4	us-gaap	Assets Sold Under Agreements To Repurchase Carrying Amounts AssetsSoldUnderAgreementsToRepurchaseCarryingAmounts	1418665000	USD
CY2012Q4	us-gaap	Assets Sold Under Agreements To Repurchase Market Value AssetsSoldUnderAgreementsToRepurchaseMarketValue	1459837000	USD
CY2012Q4	us-gaap	Assets Sold Under Agreements To Repurchase Interest Rate AssetsSoldUnderAgreementsToRepurchaseInterestRate	0.0285	pure
CY2012	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	77282	shares
CY2011	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	62914	shares
CY2010	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	83088	shares
CY2011	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	22899000	USD
CY2011	iboc	Allowance For Loans And Leases Losses Recoveries Of Bad Debts AllowanceForLoansAndLeasesLossesRecoveriesOfBadDebts	5291000	USD
CY2011	iboc	Allowance For Loan And Lease Losses Write Offs Net AllowanceForLoanAndLeaseLossesWriteOffsNet	17608000	USD
CY2011	us-gaap	Allowance For Loan And Lease Losses Provision For Loss Gross AllowanceForLoanAndLeaseLossesProvisionForLossGross	17318000	USD
CY2011Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	84192000	USD
CY2010Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	84482000	USD
CY2012	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	58346000	USD
CY2012	iboc	Allowance For Loans And Leases Losses Recoveries Of Bad Debts AllowanceForLoansAndLeasesLossesRecoveriesOfBadDebts	4388000	USD
CY2012Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	4691999000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	4684768000	USD
CY2012Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	53447000	USD
CY2011Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	118505000	USD
CY2011	iboc	Financing Receivable Recorded Investment Nonaccrual Status Reduction In Interest Income FinancingReceivableRecordedInvestmentNonaccrualStatusReductionInInterestIncome	4114000	USD
CY2011Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	14288000	USD
CY2010Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	108030000	USD
CY2010	iboc	Financing Receivable Recorded Investment Nonaccrual Status Reduction In Interest Income FinancingReceivableRecordedInvestmentNonaccrualStatusReductionInInterestIncome	3750000	USD
CY2010Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	19848000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	71768000	USD
CY2012	iboc	Financing Receivable Recorded Investment Nonaccrual Status Reduction In Interest Income FinancingReceivableRecordedInvestmentNonaccrualStatusReductionInInterestIncome	2549000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	15033000	USD
CY2011Q4	us-gaap	Financing Receivable Recorded Investment30 To59 Days Past Due FinancingReceivableRecordedInvestment30To59DaysPastDue	48472000	USD
CY2011Q4	us-gaap	Financing Receivable Recorded Investment60 To89 Days Past Due FinancingReceivableRecordedInvestment60To89DaysPastDue	19594000	USD
CY2011Q4	us-gaap	Financing Receivable Recorded Investment Equal To Greater Than90 Days Past Due FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue	71614000	USD
CY2011Q4	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	139680000	USD
CY2011Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	4913795000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment30 To59 Days Past Due FinancingReceivableRecordedInvestment30To59DaysPastDue	19507000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment60 To89 Days Past Due FinancingReceivableRecordedInvestment60To89DaysPastDue	28372000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment Equal To Greater Than90 Days Past Due FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue	42357000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	90236000	USD
CY2009Q4	us-gaap	Stockholders Equity StockholdersEquity	1407470000	USD
CY2010Q4	us-gaap	Stockholders Equity StockholdersEquity	1459217000	USD
CY2010	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	24444000	USD
CY2011	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	25648000	USD
CY2010	iboc	Accretion Of Discounts Investments AccretionOfDiscountsInvestments	1693000	USD
CY2011	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	9000	USD
CY2010	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	35000	USD
CY2011	us-gaap	Share Based Compensation ShareBasedCompensation	387000	USD
CY2010	us-gaap	Share Based Compensation ShareBasedCompensation	534000	USD
CY2011	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	11633000	USD
CY2012	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	26894000	USD
CY2010	us-gaap	Dividends Preferred Stock DividendsPreferredStock	10800000	USD
CY2011	us-gaap	Dividends Preferred Stock DividendsPreferredStock	10800000	USD
CY2011	iboc	Amortization Of Investment Securities Premiums AmortizationOfInvestmentSecuritiesPremiums	18362000	USD
CY2010	iboc	Amortization Of Investment Securities Premiums AmortizationOfInvestmentSecuritiesPremiums	13211000	USD
CY2012	us-gaap	Dividends Preferred Stock DividendsPreferredStock	8910000	USD
CY2010	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	6949000	USD
CY2011	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	6435000	USD
CY2012	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	1716000	USD
CY2010	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	484000	USD
CY2011	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	113000	USD
CY2012	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	51000	USD
CY2010	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	534000	USD
CY2011	us-gaap	Preferred Stock Dividend Rate Percentage PreferredStockDividendRatePercentage	0.05	pure
CY2010	us-gaap	Preferred Stock Dividend Rate Percentage PreferredStockDividendRatePercentage	0.05	pure
CY2012	us-gaap	Preferred Stock Dividend Rate Percentage PreferredStockDividendRatePercentage	0.05	pure
CY2010	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	408888000	shares
CY2012	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	95466000	shares
CY2011	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	387000	USD
CY2012	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	474000	USD
CY2010	iboc	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Net Of Reclassification Adjustment OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringNetOfReclassificationAdjustment	-37101000	USD
CY2011	iboc	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Net Of Reclassification Adjustment OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringNetOfReclassificationAdjustment	56182000	USD
CY2011	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	425655000	shares
CY2011	iboc	Change In Fair Value Of Loans Other Real Estate Owned ChangeInFairValueOfLoansOtherRealEstateOwned	9806000	USD
CY2010	iboc	Change In Fair Value Of Loans Other Real Estate Owned ChangeInFairValueOfLoansOtherRealEstateOwned	657000	USD
CY2011	iboc	Accretion Of Time Deposit Discounts AccretionOfTimeDepositDiscounts	11000	USD
CY2010	iboc	Accretion Of Time Deposit Discounts AccretionOfTimeDepositDiscounts	14000	USD
CY2011	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	361000	USD
CY2010	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	22000	USD
CY2011	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	738000	USD
CY2010	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	266000	USD
CY2011	iboc	Accretion Of Discounts Investments AccretionOfDiscountsInvestments	2081000	USD
CY2012	us-gaap	Schedule Of Repurchase Agreements ScheduleOfRepurchaseAgreements	<div style="FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt"> <p style="TEXT-ALIGN: justify; FONT-FAMILY: times"><font size="2">Further information related to repurchase agreements at December 31, 2012 and 2011 is set forth in the following table:</font></p> <div style="POSITION: relative; PADDING-BOTTOM: 0pt; PADDING-LEFT: 0pt; WIDTH: 81.28%; PADDING-RIGHT: 0pt; HEIGHT: 386px; MARGIN-LEFT: 10%; PADDING-TOP: 0pt"> <p style="TEXT-ALIGN: justify; FONT-FAMILY: times"><font size="2"><!-- COMMAND=ADD_TABLEWIDTH,"110%" --></font></p> <!-- User-specified TAGGED TABLE --> <div align="center"> <table border="0" cellspacing="0" cellpadding="0" width="110%"> <tr style="HEIGHT: 0px"><!-- TABLE COLUMN WIDTHS SET --> <td style="FONT-FAMILY: times" align="left"></td> <td style="FONT-FAMILY: times" width="12"></td> <td style="FONT-FAMILY: times" width="7" align="right"></td> <td style="FONT-FAMILY: times" width="70"></td> <td style="FONT-FAMILY: times" width="12"></td> <td style="FONT-FAMILY: times" width="7" align="right"></td> <td style="FONT-FAMILY: times" width="70"></td> <td style="FONT-FAMILY: times" width="12"></td> <td style="FONT-FAMILY: times" width="7" align="right"></td> <td style="FONT-FAMILY: times" width="61"></td> <td style="FONT-FAMILY: times" width="12"></td> <td style="FONT-FAMILY: times" width="7" align="right"></td> <td style="FONT-FAMILY: times" width="82"></td> <td style="FONT-FAMILY: times" width="12"></td><!-- TABLE COLUMN WIDTHS END --></tr> <tr style="HEIGHT: 0px" valign="bottom"> <th style="FONT-FAMILY: times" align="left"><font size="2"> </font><br /></th> <th style="FONT-FAMILY: times"><font size="1"> </font></th> <th style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" colspan="5" align="center"><font size="1"><b>Collateral Securities</b></font></th> <th style="FONT-FAMILY: times"><font size="1"> </font></th> <th style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" colspan="5" align="center"><font size="1"><b>Repurchase Borrowing</b></font></th> <th style="FONT-FAMILY: times"><font size="1"> </font></th></tr> <tr style="HEIGHT: 0px" valign="bottom"> <th style="FONT-FAMILY: times" align="left"><font size="1"> </font><br /></th> <th style="FONT-FAMILY: times"><font size="1"> </font></th> <th style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" colspan="2" align="center"><font size="1"><b>Book Value of<br /> Securities Sold</b></font></th> <th style="FONT-FAMILY: times"><font size="1"> </font></th> <th style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" colspan="2" align="center"><font size="1"><b>Fair Value of<br /> Securities Sold</b></font></th> <th style="FONT-FAMILY: times"><font size="1"> </font></th> <th style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" colspan="2" align="center"><font size="1"><b>Balance of<br /> Liability</b></font></th> <th style="FONT-FAMILY: times"><font size="1"> </font></th> <th style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" colspan="2" align="center"><font size="1"><b>Weighted Average<br /> Interest Rate</b></font></th> <th style="FONT-FAMILY: times"><font size="1"> </font></th></tr> <tr style="HEIGHT: 0px" valign="bottom"> <th style="FONT-FAMILY: times" align="left"><font size="1"> </font><br /></th> <th style="FONT-FAMILY: times"><font size="1"> </font></th> <th style="FONT-FAMILY: times" colspan="11" align="center"><font size="1"><b>(Dollars in Thousands)</b></font><br /></th> <th style="FONT-FAMILY: times"><font size="1"> </font></th></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times" valign="bottom"> <p style="TEXT-INDENT: -10pt; FONT-FAMILY: times; MARGIN-LEFT: 10pt"><font size="2">December 31, 2012 term:</font></p></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="white"> <td style="FONT-FAMILY: times" valign="bottom"> <p style="TEXT-INDENT: -10pt; FONT-FAMILY: times; MARGIN-LEFT: 20pt"><font size="2">Overnight agreements</font></p></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">$</font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">340,711</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">$</font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">350,933</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">$</font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">263,992</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">.28</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2">%</font></td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times" valign="bottom"> <p style="TEXT-INDENT: -10pt; FONT-FAMILY: times; MARGIN-LEFT: 20pt"><font size="2">1 to 29 days</font></p></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">10,378</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">10,910</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">6,992</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">1.10</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="white"> <td style="FONT-FAMILY: times" valign="bottom"> <p style="TEXT-INDENT: -10pt; FONT-FAMILY: times; MARGIN-LEFT: 20pt"><font size="2">30 to 90 days</font></p></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">33,619</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">35,097</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">22,078</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">1.05</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times" valign="bottom"> <p style="TEXT-INDENT: -10pt; FONT-FAMILY: times; MARGIN-LEFT: 20pt"><font size="2">Over 90 days</font></p></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">1,033,957</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">1,062,897</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">836,617</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">3.73</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td></tr> <tr style="HEIGHT: 0px; FONT-SIZE: 1.5pt" valign="top"> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" valign="bottom" colspan="2" align="right"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" valign="bottom" colspan="2" align="right"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" valign="bottom" colspan="2" align="right"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom" align="right"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="white"> <td style="FONT-FAMILY: times" valign="bottom"> <p style="TEXT-INDENT: -10pt; FONT-FAMILY: times; MARGIN-LEFT: 20pt"><font size="2">Total</font></p></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">$</font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">1,418,665</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">$</font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">1,459,837</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">$</font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">1,129,679</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">2.85</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2">%</font></td></tr> <tr style="HEIGHT: 0px; FONT-SIZE: 1.5pt" valign="top"> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 2.25pt double; FONT-FAMILY: times" valign="bottom" colspan="2" align="right"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 2.25pt double; FONT-FAMILY: times" valign="bottom" colspan="2" align="right"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 2.25pt double; FONT-FAMILY: times" valign="bottom" colspan="2" align="right"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom" align="right"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times" valign="bottom"> <p style="TEXT-INDENT: -10pt; FONT-FAMILY: times; MARGIN-LEFT: 10pt"><font size="2">December 31, 2011 term:</font></p></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="white"> <td style="FONT-FAMILY: times" valign="bottom"> <p style="TEXT-INDENT: -10pt; FONT-FAMILY: times; MARGIN-LEFT: 20pt"><font size="2">Overnight agreements</font></p></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">$</font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">377,620</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">$</font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">388,304</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">$</font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">245,026</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">.32</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2">%</font></td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times" valign="bottom"> <p style="TEXT-INDENT: -10pt; FONT-FAMILY: times; MARGIN-LEFT: 20pt"><font size="2">1 to 29 days</font></p></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">13,772</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">14,227</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">10,263</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">1.13</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="white"> <td style="FONT-FAMILY: times" valign="bottom"> <p style="TEXT-INDENT: -10pt; FONT-FAMILY: times; MARGIN-LEFT: 20pt"><font size="2">30 to 90 days</font></p></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">45,512</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">48,177</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">30,095</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">1.12</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times" valign="bottom"> <p style="TEXT-INDENT: -10pt; FONT-FAMILY: times; MARGIN-LEFT: 20pt"><font size="2">Over 90 days</font></p></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">1,236,021</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">1,285,811</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">1,063,245</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">3.72</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td></tr> <tr style="HEIGHT: 0px; FONT-SIZE: 1.5pt" valign="top"> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" valign="bottom" colspan="2" align="right"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" valign="bottom" colspan="2" align="right"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" valign="bottom" colspan="2" align="right"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom" align="right"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="white"> <td style="FONT-FAMILY: times" valign="bottom"> <p style="TEXT-INDENT: -10pt; FONT-FAMILY: times; MARGIN-LEFT: 20pt"><font size="2">Total</font></p></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">$</font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">1,672,925</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">$</font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">1,736,519</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">$</font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">1,348,629</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="2">3.02</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="2">%</font></td></tr> <tr style="HEIGHT: 0px; FONT-SIZE: 1.5pt" valign="top"> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 2.25pt double; FONT-FAMILY: times" valign="bottom" colspan="2" align="right"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 2.25pt double; FONT-FAMILY: times" valign="bottom" colspan="2" align="right"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 2.25pt double; FONT-FAMILY: times" valign="bottom" colspan="2" align="right"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom" align="right"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td></tr></table></div> <!-- end of user-specified TAGGED TABLE --></div></div>
CY2010	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	15023000	USD
CY2011	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-2299000	USD
CY2010	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-3532000	USD
CY2011	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	-3658000	USD
CY2010	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	-6071000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-2303000	USD
CY2010	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-7824000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-4966000	USD
CY2010	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	1652000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	180823000	USD
CY2010	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	178155000	USD
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	160013000	USD
CY2011	us-gaap	Proceeds From Maturities Prepayments And Calls Of Other Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfOtherInvestments	1425000	USD
CY2010	us-gaap	Proceeds From Maturities Prepayments And Calls Of Other Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfOtherInvestments	4423000	USD
CY2011	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	2231330000	USD
CY2010	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	2666596000	USD
CY2011	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	999419000	USD
CY2010	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	1085817000	USD
CY2011	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	-306915000	USD
CY2010	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	-164241000	USD
CY2011	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	11941000	USD
CY2010	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	7438000	USD
CY2011	iboc	Distributions From Other Investments DistributionsFromOtherInvestments	33320000	USD
CY2010	iboc	Distributions From Other Investments DistributionsFromOtherInvestments	20910000	USD
CY2011	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	20393000	USD
CY2010	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	15953000	USD
CY2011	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	1719000	USD
CY2010	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	2005000	USD
CY2011	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	25324000	USD
CY2010	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	8362000	USD
CY2011	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	174000	USD
CY2010	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	235000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	207133000	USD
CY2010	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-255443000	USD
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-261016000	USD
CY2011	iboc	Increase Decrease In Noninterest Bearing Demand Deposits IncreaseDecreaseInNoninterestBearingDemandDeposits	-287942000	USD
CY2010	iboc	Increase Decrease In Noninterest Bearing Demand Deposits IncreaseDecreaseInNoninterestBearingDemandDeposits	-122277000	USD
CY2011	iboc	Increase Decrease In Saving And Interest Bearing Demand Deposits IncreaseDecreaseInSavingAndInterestBearingDemandDeposits	-184851000	USD
CY2010	iboc	Increase Decrease In Saving And Interest Bearing Demand Deposits IncreaseDecreaseInSavingAndInterestBearingDemandDeposits	-260290000	USD
CY2011	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	-126248000	USD
CY2010	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	38998000	USD
CY2011	us-gaap	Increase Decrease In Loans From Other Federal Home Loan Banks IncreaseDecreaseInLoansFromOtherFederalHomeLoanBanks	-532619000	USD
CY2011	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	-84641000	USD
CY2010	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	-8547000	USD
CY2010	us-gaap	Increase Decrease In Loans From Other Federal Home Loan Banks IncreaseDecreaseInLoansFromOtherFederalHomeLoanBanks	-320845000	USD
CY2011	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	10400000	USD
CY2011	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	6435000	USD
CY2010	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	6949000	USD
CY2011	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	113000	USD
CY2010	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	484000	USD
CY2011	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	25648000	USD
CY2010	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	24444000	USD
CY2011	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	10800000	USD
CY2010	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	10800000	USD
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-323885000	USD
CY2010	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	50464000	USD
CY2012	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	122218000	USD
CY2011	us-gaap	Interest Paid InterestPaid	97699000	USD
CY2010	us-gaap	Interest Paid InterestPaid	116037000	USD
CY2011	us-gaap	Income Taxes Paid IncomeTaxesPaid	60922000	USD
CY2010	us-gaap	Income Taxes Paid IncomeTaxesPaid	78435000	USD
CY2011	iboc	Investment Securities Purchases Not Yet Settled InvestmentSecuritiesPurchasesNotYetSettled	72538000	USD
CY2010	iboc	Investment Securities Purchases Not Yet Settled InvestmentSecuritiesPurchasesNotYetSettled	160216000	USD
CY2011	us-gaap	Transfer Of Other Real Estate TransferOfOtherRealEstate	32005000	USD
CY2010	us-gaap	Transfer Of Other Real Estate TransferOfOtherRealEstate	59429000	USD
CY2011	iboc	Dividends Preferred Stock Accrued DividendsPreferredStockAccrued	1350000	USD
CY2010	iboc	Dividends Preferred Stock Accrued DividendsPreferredStockAccrued	1350000	USD
CY2012	us-gaap	Interest Paid InterestPaid	77431000	USD
CY2012	us-gaap	Income Taxes Paid IncomeTaxesPaid	36303000	USD
CY2012	us-gaap	Transfer Of Other Real Estate TransferOfOtherRealEstate	54441000	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	197814000	USD
CY2009Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	224638000	USD
CY2012	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	55634000	USD
CY2012	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	4381000	USD
CY2010	iboc	Income Tax Reconciliation Nondeductible Expense Litigation IncomeTaxReconciliationNondeductibleExpenseLitigation	5375000	USD
CY2011	iboc	Income Tax Reconciliation Noninterest Income Other IncomeTaxReconciliationNoninterestIncomeOther	3083000	USD
CY2010	iboc	Income Tax Reconciliation Noninterest Income Other IncomeTaxReconciliationNoninterestIncomeOther	3172000	USD
CY2011	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	600000	USD
CY2010	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	761000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	34035000	USD
CY2011Q4	iboc	Deferred Tax Assets Other Real Estate Owned DeferredTaxAssetsOtherRealEstateOwned	3774000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Impairment Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses	3288000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	514000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	5189000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	46800000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	24323000	USD
CY2012Q4	iboc	Deferred Tax Assets Other Real Estate Owned DeferredTaxAssetsOtherRealEstateOwned	3919000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Impairment Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses	3611000	USD
CY2012	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	40375000	USD
CY2012	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	2234000	USD
CY2012	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	33000	USD
CY2012	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	42642000	USD
CY2011	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	61279000	USD
CY2011	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	5083000	USD
CY2011	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	15000	USD
CY2011	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	66377000	USD
CY2010	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	70338000	USD
CY2010	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	4129000	USD
CY2010	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	22000	USD
CY2010	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	74489000	USD
CY2011	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-2296000	USD
CY2010	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-3394000	USD
CY2011	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-3000	USD
CY2010	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-138000	USD
CY2012	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	7928000	USD
CY2012	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-5000	USD
CY2012	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	7923000	USD
CY2012	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35	pure
CY2011	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35	pure
CY2010	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35	pure
CY2012	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1446000	USD
CY2012	iboc	Income Tax Reconciliation Noninterest Income Other IncomeTaxReconciliationNoninterestIncomeOther	2691000	USD
CY2012	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	557000	USD
CY2011	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	66941000	USD
CY2010	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	70355000	USD
CY2011	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	3682000	USD
CY2010	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	2813000	USD
CY2011	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	3302000	USD
CY2010	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	2594000	USD
CY2010	us-gaap	Income Tax Reconciliation Deductions IncomeTaxReconciliationDeductions	2143000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	137000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	5549000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	37539000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	23313000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Other Comprehensive Income DeferredTaxLiabilitiesOtherComprehensiveIncome	47252000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssets	18430000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	9439000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	98434000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	-51634000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	21529000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Other Comprehensive Income DeferredTaxLiabilitiesOtherComprehensiveIncome	36156000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssets	18133000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	10182000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	86000000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	-48461000	USD
CY2012Q4	iboc	Securities Sold Under Long Term Agreements To Repurchase SecuritiesSoldUnderLongTermAgreementsToRepurchase	800000000	USD
CY2012Q4	us-gaap	Securities Loaned Or Sold Under Agreements To Repurchase Fair Value Disclosure SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseFairValueDisclosure	932007000	USD
CY2012Q4	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	6527000	USD
CY2012Q4	iboc	Federal Home Loan Bank Advances Long Term Fair Value Disclosure FederalHomeLoanBankAdvancesLongTermFairValueDisclosure	7073000	USD
CY2012	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	8300000	USD
CY2011	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	12200000	USD
CY2010	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	12800000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	4580000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	3330000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	2209000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	1628000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	519000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	431000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	12697000	USD
CY2012	iboc	Operating Leases Future Minimum Payments Due Future Minimum Sublease Rentals Minimum Period OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsMinimumPeriod	P1Y
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due Future Minimum Sublease Rentals OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals	61900000	USD
CY2011Q4	iboc	Cash Reserve To Satisfy Regulatory Reserve Requirements CashReserveToSatisfyRegulatoryReserveRequirements	73325000	USD
CY2012Q4	iboc	Cash Reserve To Satisfy Regulatory Reserve Requirements CashReserveToSatisfyRegulatoryReserveRequirements	84070000	USD
CY2011Q3	us-gaap	Number Of Stores NumberOfStores	55	store
CY2011Q3	us-gaap	Restructuring And Related Cost Expected Cost RestructuringAndRelatedCostExpectedCost	5360000	USD
CY2011Q4	us-gaap	Related Party Transaction Due From To Related Party RelatedPartyTransactionDueFromToRelatedParty	51370000	USD
CY2012Q4	us-gaap	Related Party Transaction Due From To Related Party RelatedPartyTransactionDueFromToRelatedParty	51102000	USD
CY2012Q4	us-gaap	Preferred Stock Liquidation Preference Value PreferredStockLiquidationPreferenceValue	216000000	USD
CY2012	iboc	Preferred Stock Dividend Rate Percentage For First Five Years PreferredStockDividendRatePercentageForFirstFiveYears	0.05	pure
CY2012	iboc	Preferred Stock Dividend Rate Percentage Thereafter PreferredStockDividendRatePercentageThereafter	0.09	pure
CY2012Q4	us-gaap	Class Of Warrant Or Right Number Of Securities Called By Warrants Or Rights ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights	1326238	shares
CY2012Q4	us-gaap	Class Of Warrant Or Right Exercise Price Of Warrants Or Rights ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights	24.43
CY2012	iboc	Class Of Warrant Or Right Term ClassOfWarrantOrRightTerm	P10Y
CY2012	iboc	Maximum Dividend Income To Be Received From Subsidiaries MaximumDividendIncomeToBeReceivedFromSubsidiaries	520000000	USD
CY2011	us-gaap	Allowance For Loan And Lease Losses Provision For Loss Net AllowanceForLoanAndLeaseLossesProvisionForLossNet	1100000	USD
CY2011	iboc	Allowance For Loan Lease Losses Write Offs Prior To Foreclosure AllowanceForLoanLeaseLossesWriteOffsPriorToForeclosure	9509000	USD
CY2012	us-gaap	Allowance For Loan And Lease Losses Provision For Loss Net AllowanceForLoanAndLeaseLossesProvisionForLossNet	10450000	USD
CY2012	iboc	Allowance For Loan Lease Losses Write Offs Prior To Foreclosure AllowanceForLoanLeaseLossesWriteOffsPriorToForeclosure	0	USD
CY2011Q4	iboc	Securities Sold Under Long Term Agreements To Repurchase SecuritiesSoldUnderLongTermAgreementsToRepurchase	1000000000	USD
CY2011Q4	us-gaap	Securities Loaned Or Sold Under Agreements To Repurchase Fair Value Disclosure SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseFairValueDisclosure	1161849000	USD
CY2011Q4	iboc	Junior Subordinated Debenture With Fixed Rates Of Interest Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureWithFixedRatesOfInterestOwedToUnconsolidatedSubsidiaryTrust	87630000	USD
CY2011Q4	us-gaap	Fair Value Liabilities Measured On Recurring Basis Subordinated Debt Obligations FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations	43403000	USD
CY2011Q4	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	6661000	USD
CY2011Q4	iboc	Federal Home Loan Bank Advances Long Term Fair Value Disclosure FederalHomeLoanBankAdvancesLongTermFairValueDisclosure	6998000	USD
CY2011Q4	iboc	Time Deposits Fair Value Disclosure TimeDepositsFairValueDisclosure	3323680000	USD
CY2012	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	280000	USD
CY2012	iboc	Increase Decrease In Noninterest Bearing Demand Deposits IncreaseDecreaseInNoninterestBearingDemandDeposits	-538732000	USD
CY2012	iboc	Increase Decrease In Saving And Interest Bearing Demand Deposits IncreaseDecreaseInSavingAndInterestBearingDemandDeposits	-159458000	USD
CY2012	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	-357069000	USD
CY2012	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	-218950000	USD
CY2012	us-gaap	Increase Decrease In Loans From Other Federal Home Loan Banks IncreaseDecreaseInLoansFromOtherFederalHomeLoanBanks	254866000	USD
CY2012	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2012	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2012Q2	dei	Entity Public Float EntityPublicFloat	1312301000	USD
CY2012	iboc	Number Of Statutory Business Trusts Issuing Preferred Securities NumberOfStatutoryBusinessTrustsIssuingPreferredSecurities	8	item
CY2012	iboc	Maximum Number Of Consecutive Quarterly Periods Available For Deferral Of Payment Of Interest MaximumNumberOfConsecutiveQuarterlyPeriodsAvailableForDeferralOfPaymentOfInterest	20	item
CY2012	iboc	Maximum Percentage Of Capital Securities Issued By Trust Qualifying As Tier One Capital MaximumPercentageOfCapitalSecuritiesIssuedByTrustQualifyingAsTierOneCapital	0.25	pure
CY2012Q4	iboc	Capital Securities Issued By Trust Qualifying As Tier One Capital CapitalSecuritiesIssuedByTrustQualifyingAsTierOneCapital	190726000	USD
CY2011Q4	iboc	Capital Securities Issued By Trust Qualifying As Tier One Capital CapitalSecuritiesIssuedByTrustQualifyingAsTierOneCapital	190726000	USD
CY2010	iboc	Interest Expense Time Deposits100000 Or More Foreign InterestExpenseTimeDeposits100000OrMoreForeign	17084000	USD
CY2010	iboc	Interest Expense Time Deposits Less Than100000 Domestic InterestExpenseTimeDepositsLessThan100000Domestic	11416000	USD
CY2010	iboc	Interest Expense Time Deposits Less Than100000 Foreign InterestExpenseTimeDepositsLessThan100000Foreign	3628000	USD
CY2010	us-gaap	Interest Expense Deposits InterestExpenseDeposits	56350000	USD
CY2011Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2012Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2011	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	183331000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-19297000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	88538000	USD
CY2011	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	64071000	USD
CY2010	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	-26824000	USD
CY2012	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	1	item
CY2011Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	27252000	USD
CY2012Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	4746000	USD
CY2012Q4	us-gaap	Liabilities Liabilities	10446965000	USD
CY2012	iboc	Prepayment Penalty On Securities Sold Under Repurchase Agreement PrepaymentPenaltyOnSecuritiesSoldUnderRepurchaseAgreement	31550000	USD
CY2012	iboc	Change In Fair Value Of Loans Other Real Estate Owned ChangeInFairValueOfLoansOtherRealEstateOwned	1776000	USD
CY2012	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	538000	USD
CY2012	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	-488000	USD
CY2012	iboc	Accretion Of Discounts Investments AccretionOfDiscountsInvestments	3195000	USD
CY2012	iboc	Amortization Of Investment Securities Premiums AmortizationOfInvestmentSecuritiesPremiums	30501000	USD
CY2012	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	9892000	USD
CY2012	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	-968000	USD
CY2012	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	5392000	USD
CY2012	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	7106000	USD
CY2012	us-gaap	Proceeds From Maturities Prepayments And Calls Of Other Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfOtherInvestments	1125000	USD
CY2012	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	3081034000	USD
CY2012	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	1294197000	USD
CY2012	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	-170072000	USD
CY2012	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	4228000	USD
CY2012	iboc	Distributions From Other Investments DistributionsFromOtherInvestments	-7410000	USD
CY2012	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	62030000	USD
CY2012	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	7575000.	USD
CY2012	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1716000	USD
CY2012	us-gaap	Payments For Repurchase Of Preferred Stock And Preference Stock PaymentsForRepurchaseOfPreferredStockAndPreferenceStock	216000000	USD
CY2012	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	51000	USD
CY2012	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	26894000	USD
CY2012	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	10260000	USD
CY2012	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	21215000	USD
CY2010	iboc	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net After Tax OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAfterTax	5470000	USD
CY2012Q4	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	216000	shares
	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	41520139	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	5018000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	-24990000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Writedown Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForWritedownOfSecuritiesIncludedInNetIncomeNetOfTax	675000	USD
CY2012Q4	iboc	Time Deposits Fair Value Disclosure TimeDepositsFairValueDisclosure	2962190000	USD
CY2012	us-gaap	Stock Redeemed Or Called During Period Shares StockRedeemedOrCalledDuringPeriodShares	216000	shares

Files In Submission

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$IBOC
International Bancshares Corp Stock $iboc

2011 Q4 Form 10-K Financial Statement

#000104746913001618 Filed on February 25, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$IBOC International Bancshares Corp Stock $iboc

2011 Q4 Form 10-K Financial Statement

#000104746913001618 Filed on February 25, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$IBOC
International Bancshares Corp Stock $iboc