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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