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International Bancshares Corporation (Parent Company Only) Financial Information Statements of Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Expenses:      
Interest expense (Debentures) $ 5,392 $ 4,600 $ 4,099
Income before federal income taxes and equity in undistributed net income of subsidiaries 221,642 197,003 206,842
Income tax expense 64,206 63,071 70,116
Net income 157,436 133,932 136,726
Parent Company      
Income:      
Dividends from subsidiaries 64,600 84,432 51,575
Interest income on notes receivable   2 7
Interest income on other investments 8,100 8,958 5,738
Other 26 255 3,442
Total income 72,726 93,647 60,762
Expenses:      
Interest expense (Debentures) 5,392 4,600 4,099
Other 5,648 3,637 3,037
Total expenses 11,040 8,237 7,136
Income before federal income taxes and equity in undistributed net income of subsidiaries 61,686 85,410 53,626
Income tax expense (2,076) 311 386
Income before equity in undistributed net income of subsidiaries 63,762 85,099 53,240
Equity in undistributed net income of subsidiaries 93,674 48,833 83,486
Net income $ 157,436 $ 133,932 $ 136,726