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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, 2011
Dec. 31, 2010
Dec. 31, 2009
Income:      
Other interest income $ 1,869 $ 2,221 $ 607
Expenses:      
Interest expense (Debentures) 11,073 12,201 12,535
Income before federal income taxes and equity in undistributed net income of subsidiaries 191,227 200,980 220,730
Income tax (benefit) provision (64,078) (70,957) (77,988)
Net income 127,149 130,023 142,742
Preferred stock dividends and discount accretion 13,280 13,126 12,984
Net income available to common shareholders 113,869 116,897 129,758
Parent Company
      
Income:      
Dividends from subsidiaries 54,800 51,720 45,122
Interest income on notes receivable 19 5 6
Interest income on other investments 7,517 10,090 8,191
Other interest income 69 546 914
Other 41 (742) 7,225
Total income 62,446 61,619 61,458
Expenses:      
Interest expense (Debentures) 11,073 12,201 12,535
Other 6,543 3,408 1,751
Total expenses 17,616 15,609 14,286
Income before federal income taxes and equity in undistributed net income of subsidiaries 44,830 46,010 47,172
Income tax (benefit) provision (3,513) (2,090) 743
Income before equity in undistributed net income of subsidiaries 48,343 48,100 46,429
Equity in undistributed net income of subsidiaries 78,806 81,923 96,313
Net income 127,149 130,023 142,742
Preferred stock dividends and discount accretion 13,280 13,126 12,984
Net income available to common shareholders $ 113,869 $ 116,897 $ 129,758