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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

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