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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

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