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International Bancshares Corporation (Parent Company Only) Financial Information Statements of Condition (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
ASSETS        
Other investments $ 420,670us-gaap_OtherLongTermInvestments $ 388,563us-gaap_OtherLongTermInvestments    
Other assets 130,711us-gaap_OtherAssets 158,862us-gaap_OtherAssets    
Total assets 12,196,520us-gaap_Assets 12,079,477us-gaap_Assets    
Liabilities:        
Junior subordinated deferrable interest debentures 175,416us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust 190,726us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust    
Other liabilities 69,527us-gaap_OtherLiabilities 39,587us-gaap_OtherLiabilities    
Total liabilities 10,615,862us-gaap_Liabilities 10,655,069us-gaap_Liabilities    
Shareholders' equity:        
Common shares 95,784us-gaap_CommonStockValue 95,744us-gaap_CommonStockValue    
Surplus 165,520us-gaap_AdditionalPaidInCapital 163,947us-gaap_AdditionalPaidInCapital    
Retained earnings 1,585,389us-gaap_RetainedEarningsAccumulatedDeficit 1,467,000us-gaap_RetainedEarningsAccumulatedDeficit    
Accumulated other comprehensive income (loss) 11,397us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (43,774)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax    
Total shareholders' equity before treasury stock 1,858,090us-gaap_StockholdersEquityBeforeTreasuryStock 1,682,917us-gaap_StockholdersEquityBeforeTreasuryStock    
Less cost of shares in treasury (277,432)us-gaap_TreasuryStockValue (258,509)us-gaap_TreasuryStockValue    
Total shareholders' equity 1,580,658us-gaap_StockholdersEquity 1,424,408us-gaap_StockholdersEquity 1,435,708us-gaap_StockholdersEquity 1,600,165us-gaap_StockholdersEquity
Total liabilities and shareholders' equity 12,196,520us-gaap_LiabilitiesAndStockholdersEquity 12,079,477us-gaap_LiabilitiesAndStockholdersEquity    
Parent Company        
ASSETS        
Cash 9,252us-gaap_Cash
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
8,106us-gaap_Cash
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other investments 69,042us-gaap_OtherLongTermInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
62,381us-gaap_OtherLongTermInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Notes receivable 204us-gaap_NotesReceivableNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
313us-gaap_NotesReceivableNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Investment in subsidiaries 1,691,553iboc_InvestmentInSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,556,932iboc_InvestmentInSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other assets 50us-gaap_OtherAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
197us-gaap_OtherAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total assets 1,770,101us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,627,929us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Liabilities:        
Junior subordinated deferrable interest debentures 175,416us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
190,726us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Due to IBC Trading 21iboc_IntercompanyPayables
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
21iboc_IntercompanyPayables
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other liabilities 14,006us-gaap_OtherLiabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
12,774us-gaap_OtherLiabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total liabilities 189,443us-gaap_Liabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
203,521us-gaap_Liabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Shareholders' equity:        
Common shares 95,784us-gaap_CommonStockValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
95,744us-gaap_CommonStockValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Surplus 165,520us-gaap_AdditionalPaidInCapital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
163,947us-gaap_AdditionalPaidInCapital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Retained earnings 1,585,389us-gaap_RetainedEarningsAccumulatedDeficit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,467,000us-gaap_RetainedEarningsAccumulatedDeficit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Accumulated other comprehensive income (loss) 11,397us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(43,774)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total shareholders' equity before treasury stock 1,858,090us-gaap_StockholdersEquityBeforeTreasuryStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,682,917us-gaap_StockholdersEquityBeforeTreasuryStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Less cost of shares in treasury (277,432)us-gaap_TreasuryStockValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(258,509)us-gaap_TreasuryStockValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total shareholders' equity 1,580,658us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,424,408us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total liabilities and shareholders' equity $ 1,770,101us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
$ 1,627,929us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember