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International Bancshares Corporation (Parent Company Only) Financial Information Statements of Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Expenses:      
Interest expense (Debentures) $ 8,123 $ 5,037 $ 2,791
Provision for credit loss 34,576 21,651 7,955
Income before federal income taxes and equity in undistributed net income of subsidiaries 523,512 382,639 322,327
Income tax (benefit) expense 111,744 82,407 68,405
Net income 411,768 300,232 253,922
Parent Company | Reportable Legal Entities      
Income:      
Dividends from subsidiaries 179,000 222,175 80,882
Interest income on notes receivable 5,769 2,394 1,139
(Loss) income on other investments (6,150) 8,662 9,662
Other 4 857 58
Total income 178,623 234,088 91,741
Expenses:      
Interest expense (Debentures) 8,122 5,037 2,792
Provision for credit loss 500 437  
Other 252 2,291 2,272
Total expenses 8,874 7,765 5,064
Income before federal income taxes and equity in undistributed net income of subsidiaries 169,749 226,323 86,677
Income tax (benefit) expense (1,365) 504 1,358
Income before equity in undistributed net income of subsidiaries 171,114 225,819 85,319
Equity in undistributed net income of subsidiaries 240,654 74,413 168,603
Net income $ 411,768 $ 300,232 $ 253,922