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Securities Sold Under Repurchase Agreements (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Securities Sold Under Repurchase Agreements |  |
Average outstanding amount | $ 893,830,000 iboc_SecuritiesSoldUnderAgreementsToRepurchaseAverageOutstandingAmount | $ 1,041,186,000 iboc_SecuritiesSoldUnderAgreementsToRepurchaseAverageOutstandingAmount
Maximum amount outstanding at any month end | 892,341,000 iboc_SecuritiesSoldUnderAgreementsToRepurchaseMaximumOutstandingAmountAtAnyMonthEnd | 1,119,531,000 iboc_SecuritiesSoldUnderAgreementsToRepurchaseMaximumOutstandingAmountAtAnyMonthEnd
Collateral Securities and Repurchase Borrowing agreements |  |
Collateralized Securities, Book Value of Securities Sold | 1,127,170,000 us-gaap_AssetsSoldUnderAgreementsToRepurchaseCarryingAmounts | 1,313,637,000 us-gaap_AssetsSoldUnderAgreementsToRepurchaseCarryingAmounts
Collateralized securities, Fair Value of Securities Sold | 1,134,418,000 us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue | 1,317,998,000 us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue
Repurchase Borrowing, Balance of Liability | 858,350,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase | 957,381,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
Repurchase Borrowing, Weighted Average Interest Rate (as a percent) | 2.79%us-gaap_AssetsSoldUnderAgreementsToRepurchaseInterestRate | 2.91%us-gaap_AssetsSoldUnderAgreementsToRepurchaseInterestRate
Overnight agreements |  |
Collateral Securities and Repurchase Borrowing agreements |  |
Collateralized Securities, Book Value of Securities Sold | 366,731,000 us-gaap_AssetsSoldUnderAgreementsToRepurchaseCarryingAmounts / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOvernightMember | 332,042,000 us-gaap_AssetsSoldUnderAgreementsToRepurchaseCarryingAmounts / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOvernightMember
Collateralized securities, Fair Value of Securities Sold | 370,704,000 us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOvernightMember | 341,238,000 us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOvernightMember
Repurchase Borrowing, Balance of Liability | 236,077,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOvernightMember | 209,899,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOvernightMember
Repurchase Borrowing, Weighted Average Interest Rate (as a percent) | 0.16%us-gaap_AssetsSoldUnderAgreementsToRepurchaseInterestRate / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOvernightMember | 0.17%us-gaap_AssetsSoldUnderAgreementsToRepurchaseInterestRate / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOvernightMember
1 to 29 days |  |
Collateral Securities and Repurchase Borrowing agreements |  |
Collateralized Securities, Book Value of Securities Sold | 3,717,000 us-gaap_AssetsSoldUnderAgreementsToRepurchaseCarryingAmounts / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityUpTo30DaysMember | 27,954,000 us-gaap_AssetsSoldUnderAgreementsToRepurchaseCarryingAmounts / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityUpTo30DaysMember
Collateralized securities, Fair Value of Securities Sold | 3,781,000 us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityUpTo30DaysMember | 28,288,000 us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityUpTo30DaysMember
Repurchase Borrowing, Balance of Liability | 1,016,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityUpTo30DaysMember | 18,666,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityUpTo30DaysMember
Repurchase Borrowing, Weighted Average Interest Rate (as a percent) | 0.45%us-gaap_AssetsSoldUnderAgreementsToRepurchaseInterestRate / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityUpTo30DaysMember | 0.40%us-gaap_AssetsSoldUnderAgreementsToRepurchaseInterestRate / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityUpTo30DaysMember
30 to 90 days |  |
Collateral Securities and Repurchase Borrowing agreements |  |
Collateralized Securities, Book Value of Securities Sold | 13,399,000 us-gaap_AssetsSoldUnderAgreementsToRepurchaseCarryingAmounts / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_Maturity30To90DaysMember | 8,106,000 us-gaap_AssetsSoldUnderAgreementsToRepurchaseCarryingAmounts / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_Maturity30To90DaysMember
Collateralized securities, Fair Value of Securities Sold | 13,628,000 us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_Maturity30To90DaysMember | 8,263,000 us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_Maturity30To90DaysMember
Repurchase Borrowing, Balance of Liability | 6,705,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_Maturity30To90DaysMember | 3,295,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_Maturity30To90DaysMember
Repurchase Borrowing, Weighted Average Interest Rate (as a percent) | 0.38%us-gaap_AssetsSoldUnderAgreementsToRepurchaseInterestRate / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_Maturity30To90DaysMember | 0.43%us-gaap_AssetsSoldUnderAgreementsToRepurchaseInterestRate / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_Maturity30To90DaysMember
Over 90 days |  |
Collateral Securities and Repurchase Borrowing agreements |  |
Collateralized Securities, Book Value of Securities Sold | 743,323,000 us-gaap_AssetsSoldUnderAgreementsToRepurchaseCarryingAmounts / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOver90DaysMember | 945,535,000 us-gaap_AssetsSoldUnderAgreementsToRepurchaseCarryingAmounts / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOver90DaysMember
Collateralized securities, Fair Value of Securities Sold | 746,305,000 us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOver90DaysMember | 940,209,000 us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOver90DaysMember
Repurchase Borrowing, Balance of Liability | $ 614,552,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOver90DaysMember | $ 725,521,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOver90DaysMember
Repurchase Borrowing, Weighted Average Interest Rate (as a percent) | 3.83%us-gaap_AssetsSoldUnderAgreementsToRepurchaseInterestRate / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOver90DaysMember | 3.78%us-gaap_AssetsSoldUnderAgreementsToRepurchaseInterestRate / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOver90DaysMember

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- Definition Represents the average amount of securities sold under repurchase agreements during the period. + References No definition available. + Details
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- Definition Represents the maximum balance outstanding at any month end during the period as of the balance sheet date. + References No definition available. + Details
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- Definition Carrying amount of assets sold under agreements to repurchase when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under repurchase agreements exceeds 10 percent of total assets. + 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.(m)(1)(i)(A)(i)) -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 m -Subparagraph 1 -Article 4 + Details
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- Definition Interest rate on the amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph m -Subparagraph 1 -Article 4 Reference 2: 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.(m)(1)(i)(A)(ii)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Market value of assets sold under agreements to repurchase when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under repurchase agreements exceeds 10 percent of total assets. + 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.(m)(1)(i)(A)(i)) -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 m -Subparagraph 1 -Article 4 + Details
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- Definition Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226008-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph 1 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=45278096&loc=d3e9760-107771 Reference 6: 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.(m)(1)(a)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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