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v2.4.1.9

Capital Requirements (Details) (USD $) | 0 Months Ended | 12 Months Ended | 48 Months Ended | 0 Months Ended
--- | --- | --- | --- | ---
Nov. 28, 2012 | Dec. 31, 2014 | Dec. 31, 2012 | Nov. 28, 2012 | Feb. 20, 2015
Series A cumulative perpetual preferred shares, aggregate liquidation value |  | $ 216,000,000 us-gaap_PreferredStockLiquidationPreferenceValue |  |  |
Series A cumulative perpetual preferred shares, issued |  | 216,000 us-gaap_PreferredStockSharesIssued |  |  |
Series A cumulative perpetual preferred shares, par value (in dollars per share) |  | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare |  |  |
Series A cumulative perpetual preferred shares, per share liquidation value (in dollars per share) |  | $ 1,000 us-gaap_PreferredStockLiquidationPreference |  |  |
Warrants to purchase entity's common stock (in shares) |  | 1,326,238 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights |  |  |
Warrants, exercise price (in dollars per share) |  | $ 24.43 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 |  |  |
Warrants, term |  | 10 years |  |  |
Senior preferred stock, dividend rate for first five years (as a percent) |  | 5.00%iboc_PreferredStockDividendRatePercentageForFirstFiveYears |  |  |
Senior preferred stock, dividend rate thereafter (as a percent) |  | 9.00%iboc_PreferredStockDividendRatePercentageThereafter |  |  |
Senior Preferred Stock held by Treasury repurchased (in shares) | 216,000 us-gaap_StockRepurchasedDuringPeriodShares |  |  |  |
Redemption of senior preferred shares |  |  | 216,000,000 us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock |  |
Preferred stock dividends to the U.S. Treasury |  |  | 10,260,000 us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock | 41,520,139 us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock |
Dividend payable by subsidiaries, maximum |  | $ 702,750,000 iboc_MaximumDividendIncomeToBeReceivedFromSubsidiaries |  |  |
Subsequent Event |  |  |  |  |
Warrants, exercise price (in dollars per share) |  |  |  |  | $ 24.43 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Cash dividends (as a percent) |  |  |  |  | 33.00%iboc_MaximumPercentageOfCashDividendsInExcess / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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- Definition The percentage rate used to calculate dividend payments on the preferred stock for the first five years. + References No definition available. + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 2 -Article 4 + Details
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- Definition The cash outflow to reacquire preferred stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph d -Article 4 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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