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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, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income: |  |  |
Other interest income | $ 115 | $ 503 | $ 1,869
Expenses: |  |  |
Interest expense (Debentures) | 4,665 | 6,595 | 11,073
Income before federal income taxes and equity in undistributed net income of subsidiaries | 182,590 | 158,400 | 191,227
Income tax expense (benefit) | 56,239 | 50,565 | 64,078
Net income | 126,351 | 107,835 | 127,149
Preferred stock dividends and discount accretion |  | 14,362 | 13,280
Net income available to common shareholders | 126,351 | 93,473 | 113,869
Parent Company |  |  |
Income: |  |  |
Dividends from subsidiaries | 30,000 | 229,250 | 54,800
Interest income on notes receivable | 18 | 27 | 19
Interest income on other investments | 12,301 | 6,759 | 7,517
Other interest income |  | 18 | 69
Other | 26 | 686 | 41
Total income | 42,345 | 236,740 | 62,446
Expenses: |  |  |
Interest expense (Debentures) | 4,665 | 6,595 | 11,073
Other | 1,889 | 3,867 | 6,543
Total expenses | 6,554 | 10,462 | 17,616
Income before federal income taxes and equity in undistributed net income of subsidiaries | 35,791 | 226,278 | 44,830
Income tax expense (benefit) | 2,529 | (738) | (3,513)
Income before equity in undistributed net income of subsidiaries | 33,262 | 227,016 | 48,343
Equity in undistributed (distributed) net income of subsidiaries | 93,089 | (119,181) | 78,806
Net income | 126,351 | 107,835 | 127,149
Preferred stock dividends and discount accretion |  | 14,362 | 13,280
Net income available to common shareholders | $ 126,351 | $ 93,473 | $ 113,869

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