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Deposits (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Demand non-interest bearing      
Domestic $ 2,382,935us-gaap_NoninterestBearingDepositLiabilitiesDomestic $ 2,175,694us-gaap_NoninterestBearingDepositLiabilitiesDomestic  
Foreign 547,318us-gaap_NoninterestBearingDepositLiabilitiesForeign 490,816us-gaap_NoninterestBearingDepositLiabilitiesForeign  
Total demand non-interest bearing 2,930,253us-gaap_NoninterestBearingDepositLiabilities 2,666,510us-gaap_NoninterestBearingDepositLiabilities  
Savings and interest bearing demand      
Domestic 2,488,458us-gaap_InterestBearingDepositLiabilitiesDomestic 2,364,905us-gaap_InterestBearingDepositLiabilitiesDomestic  
Foreign 537,222us-gaap_InterestBearingDepositLiabilitiesForeign 560,707us-gaap_InterestBearingDepositLiabilitiesForeign  
Total savings and interest bearing demand 3,025,680us-gaap_InterestBearingDepositLiabilities 2,925,612us-gaap_InterestBearingDepositLiabilities  
$100,000 or more      
Domestic 835,792us-gaap_TimeDeposits100000OrMoreDomestic 856,700us-gaap_TimeDeposits100000OrMoreDomestic  
Foreign 864,346us-gaap_TimeDeposits100000OrMoreForeign 938,940us-gaap_TimeDeposits100000OrMoreForeign  
Less than $100,000      
Domestic 482,089iboc_TimeDepositsLessThan100000Domestic 531,503iboc_TimeDepositsLessThan100000Domestic  
Foreign 300,465iboc_TimeDepositsLessThan100000Foreign 324,160iboc_TimeDepositsLessThan100000Foreign  
Total time, certificates of deposit 2,482,692us-gaap_TimeDeposits 2,651,303us-gaap_TimeDeposits  
Total deposits 8,438,625us-gaap_Deposits 8,243,425us-gaap_Deposits  
Savings and interest bearing demand      
Domestic 2,998iboc_InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDepositDomestic 3,182iboc_InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDepositDomestic 4,487iboc_InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDepositDomestic
Foreign 599iboc_InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDepositForeign 580iboc_InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDepositForeign 801iboc_InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDepositForeign
Total savings and interest bearing demand 3,597us-gaap_InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDeposits 3,762us-gaap_InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDeposits 5,288us-gaap_InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDeposits
$100,000 or more      
Domestic 4,615iboc_InterestExpenseTimeDeposits100000OrMoreDomestic 5,761iboc_InterestExpenseTimeDeposits100000OrMoreDomestic 8,263iboc_InterestExpenseTimeDeposits100000OrMoreDomestic
Foreign 4,529iboc_InterestExpenseTimeDeposits100000OrMoreForeign 5,590iboc_InterestExpenseTimeDeposits100000OrMoreForeign 9,148iboc_InterestExpenseTimeDeposits100000OrMoreForeign
Less than $100,000      
Domestic 2,074iboc_InterestExpenseTimeDepositsLessThan100000Domestic 3,065iboc_InterestExpenseTimeDepositsLessThan100000Domestic 4,945iboc_InterestExpenseTimeDepositsLessThan100000Domestic
Foreign 815iboc_InterestExpenseTimeDepositsLessThan100000Foreign 1,028iboc_InterestExpenseTimeDepositsLessThan100000Foreign 1,617iboc_InterestExpenseTimeDepositsLessThan100000Foreign
Total time, certificates of deposit 12,033us-gaap_InterestExpenseTimeDeposits 15,444us-gaap_InterestExpenseTimeDeposits 23,973us-gaap_InterestExpenseTimeDeposits
Total interest expense on deposits $ 15,630us-gaap_InterestExpenseDeposits $ 19,206us-gaap_InterestExpenseDeposits $ 29,261us-gaap_InterestExpenseDeposits