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Investment Securities (Details 2) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Held-to-maturity debt securities amortized cost disclosures
Due after one year through five years, held-to-maturity debt securities amortized cost	$ 2,400,000us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount
Amortized cost, held-to-maturity debt securities	2,400,000us-gaap_HeldToMaturitySecurities		2,400,000us-gaap_HeldToMaturitySecurities
Held-to-maturity debt securities, Estimated fair value disclosures
Due after one year through five years, held-to-maturity debt securities, Estimated fair value	2,400,000us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
Estimated fair value	2,400,000us-gaap_HeldToMaturitySecuritiesFairValue		2,400,000us-gaap_HeldToMaturitySecuritiesFairValue
Available-for-sale debt securities amortized cost disclosures
Due after five years through ten years, available-for-sale debt securities amortized cost	742,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost
Due after ten years, available-for-sale debt securities amortized cost	282,875,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost
Residential mortgage-backed securities, amortized cost	4,624,803,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost
Equity securities, amortized cost	28,075,000us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
Amortized cost, Available for sale securities	4,936,495,000us-gaap_AvailableForSaleSecuritiesAmortizedCost		4,914,428,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
Available for sale debt securities, Estimated Fair Value Disclosures
Due after five years through ten years, available-for-sale debt securities, Estimated Fair Value	830,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
Due after ten years, available-for-sale debt securities, Estimated Fair Value	296,924,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
Residential mortgage-backed securities, Estimated Fair Value	4,660,607,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue
Equity securities, Estimated Fair Value	29,819,000us-gaap_AvailableForSaleSecuritiesEquitySecurities
Estimated fair value, Available for sale securities	4,988,180,000us-gaap_AvailableForSaleSecurities		4,931,963,000us-gaap_AvailableForSaleSecurities
Amortized cost of available for sale investment securities pledged	2,302,935,000iboc_AvailableForSaleSecuritiesPledgedAsCollateralAmortizedCost
Fair value of available for sale investment securities pledged	2,329,855,000us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral
Proceeds from sales and calls of available for sale securities	6,290,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities	258,277,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Proceeds from sales of mortgage-backed securities	0us-gaap_ProceedsFromSaleOfMortgageBackedSecuritiesMBSCategorizedAsAvailableForSale	257,621,000us-gaap_ProceedsFromSaleOfMortgageBackedSecuritiesMBSCategorizedAsAvailableForSale
Gross gains realized on sales	0us-gaap_AvailableForSaleSecuritiesGrossRealizedGains	8,108,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Gross losses realized on sales	(1,000)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses	0us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
Impairment charges on available-for-sale investment securities	227,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet	90,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
Impairment charges on available-for-sale investment securities, after tax	$ 147,550iboc_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAfterTax	$ 58,500iboc_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAfterTax

X

- Definition

The amortized cost of available-for-sale securities that serve as collateral to partially or fully secure a debt obligation, repurchase agreement or other current or potential obligation, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party.

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The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis after taxes. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing after the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing after the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of available-for-sale debt securities at cost, net of adjustments, that do not have a single maturity date and which the entity has decided to disclose separately rather than allocating the cost over several maturity groupings. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of available-for-sale debt securities at fair value that do not have a single maturity date and which the entity has decided to disclose separately rather than allocating the fair value over several maturity groupings.

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Amount of equity securities categorized neither as held-to-maturity nor as trading.

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The fair value of available-for-sale securities that serve as collateral for borrowings.

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Fair value of held-to-maturity debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments, maturing in the next fiscal year through the fifth fiscal year following the latest fiscal year.

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Fair value of investments in debt securities classified as held-to-maturity.

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-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

The cash inflow from the sale of securities issued by a governmental agency or corporation (for example, GNMA or FHLMC) or by private issuers (for example, banks and mortgage banking enterprises) secured by and repaid from underlying mortgages, which were designated as available for sale when acquired.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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