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International Bancshares Corporation (Parent Company Only) Financial Information Statements of Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Expenses:      
Interest expense (Debentures) $ 6,989 $ 5,392 $ 4,600
Income before federal income taxes and equity in undistributed net income of subsidiaries 272,583 221,642 197,003
Income tax expense 56,652 64,206 63,071
Net income 215,931 157,436 133,932
Parent Company | Reportable Legal Entities      
Income:      
Dividends from subsidiaries 105,000 64,600 84,432
Interest income on notes receivable     2
Interest income on other investments 8,208 8,100 8,958
Other 1,988 26 255
Total income 115,196 72,726 93,647
Expenses:      
Interest expense (Debentures) 6,989 5,392 4,600
Other 2,930 5,648 3,637
Total expenses 9,919 11,040 8,237
Income before federal income taxes and equity in undistributed net income of subsidiaries 105,277 61,686 85,410
Income tax expense 481 (2,076) 311
Income before equity in undistributed net income of subsidiaries 104,796 63,762 85,099
Equity in undistributed net income of subsidiaries 111,135 93,674 48,833
Net income $ 215,931 $ 157,436 $ 133,932