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International Bancshares Corporation (Parent Company Only) Financial Information Statements of Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Expenses:      
Interest expense (Debentures) $ 5,037 $ 2,791 $ 3,832
Provision for credit loss 21,651 7,955 45,379
Income before federal income taxes and equity in undistributed net income of subsidiaries 382,639 322,327 211,758
Income tax expense (benefit) 82,407 68,405 44,439
Net income 300,232 253,922 167,319
Parent Company | Reportable Legal Entities      
Income:      
Dividends from subsidiaries 222,175 80,882 130,950
Interest income on notes receivable 2,394 1,139 357
Interest income (loss) on other investments 8,662 9,662 (1,126)
Other 857 58 5
Total income 234,088 91,741 130,186
Expenses:      
Interest expense (Debentures) 5,037 2,792 3,832
Provision for credit loss 437   27
Other 2,291 2,272 1,988
Total expenses 7,765 5,064 5,847
Income before federal income taxes and equity in undistributed net income of subsidiaries 226,323 86,677 124,339
Income tax expense (benefit) 504 1,358 (1,339)
Income before equity in undistributed net income of subsidiaries 225,819 85,319 125,678
Equity in undistributed net income of subsidiaries 74,413 168,603 41,641
Net income $ 300,232 $ 253,922 $ 167,319