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International Bancshares Corporation (Parent Company Only) Financial Information Statements of Income (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income:      
Other interest income $ 503 $ 1,869 $ 2,221
Expenses:      
Interest expense (Debentures) 6,595 11,073 12,201
Income before federal income taxes and equity in undistributed net income of subsidiaries 158,400 191,227 200,980
Income tax benefit 50,565 64,078 70,957
Net income 107,835 127,149 130,023
Preferred stock dividends and discount accretion 14,362 13,280 13,126
Net income available to common shareholders 93,473 113,869 116,897
Parent Company
      
Income:      
Dividends from subsidiaries 229,250 54,800 51,720
Interest income on notes receivable 27 19 5
Interest income on other investments 6,759 7,517 10,090
Other interest income 18 69 546
Other 686 41 (742)
Total income 236,740 62,446 61,619
Expenses:      
Interest expense (Debentures) 6,595 11,073 12,201
Other 3,867 6,543 3,408
Total expenses 10,462 17,616 15,609
Income before federal income taxes and equity in undistributed net income of subsidiaries 226,278 44,830 46,010
Income tax benefit (738) (3,513) (2,090)
Income before equity in undistributed net income of subsidiaries 227,016 48,343 48,100
Equity in (distributed) undistributed net income of subsidiaries (119,181) 78,806 81,923
Net income 107,835 127,149 130,023
Preferred stock dividends and discount accretion 14,362 13,280 13,126
Net income available to common shareholders $ 93,473 $ 113,869 $ 116,897