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International Bancshares Corporation (Parent Company Only) Financial Information Statements of Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Expenses:      
Interest expense (Debentures) $ 7,762 $ 8,123 $ 5,037
Provision for credit loss 31,802 34,576 21,651
Income before federal income taxes and equity in undistributed net income of subsidiaries 508,720 523,512 382,639
Income tax (benefit) expense 99,553 111,744 82,407
Net income 409,167 411,768 300,232
Parent Company | Reportable legal entities      
Income:      
Dividends from subsidiaries 130,000 179,000 222,175
Interest income on notes receivable 7,602 5,769 2,394
(Loss) income on other investments (3,356) (6,150) 8,662
Other 1,059 4 857
Total income 135,305 178,623 234,088
Expenses:      
Interest expense (Debentures) 7,762 8,122 5,037
Provision for credit loss 625 500 437
Other 6,252 252 2,291
Total expenses 14,639 8,874 7,765
Income before federal income taxes and equity in undistributed net income of subsidiaries 120,666 169,749 226,323
Income tax (benefit) expense (833) (1,365) 504
Income before equity in undistributed net income of subsidiaries 121,499 171,114 225,819
Equity in undistributed net income of subsidiaries 287,668 240,654 74,413
Net income $ 409,167 $ 411,768 $ 300,232