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International Bancshares Corporation (Parent Company Only) Financial Information Statements of Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Expenses:      
Interest expense (Debentures) $ 6,435 $ 6,989 $ 5,392
Income before federal income taxes and equity in undistributed net income of subsidiaries 259,954 272,583 221,642
Income tax expense 54,850 56,652 64,206
Net income 205,104 215,931 157,436
Parent Company | Reportable Legal Entities      
Income:      
Dividends from subsidiaries 127,750 105,000 64,600
Interest income on notes receivable 922    
Interest income on other investments (514) 8,208 8,100
Other 18 1,988 26
Total income 128,176 115,196 72,726
Expenses:      
Interest expense (Debentures) 6,435 6,989 5,392
Other 2,749 2,930 5,648
Total expenses 9,184 9,919 11,040
Income before federal income taxes and equity in undistributed net income of subsidiaries 118,992 105,277 61,686
Income tax expense (1,878) 481 (2,076)
Income before equity in undistributed net income of subsidiaries 120,870 104,796 63,762
Equity in undistributed net income of subsidiaries 84,234 111,135 93,674
Net income $ 205,104 $ 215,931 $ 157,436