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International Bancshares Corporation (Parent Company Only) Financial Information Statements of Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Expenses:      
Interest expense (Debentures) $ 2,791 $ 3,832 $ 6,435
Provision for credit loss 7,955 45,379 18,843
Income before federal income taxes and equity in undistributed net income of subsidiaries 322,327 211,758 259,954
Income tax expense (benefit) 68,405 44,439 54,850
Net income 253,922 167,319 205,104
Parent Company | Reportable Legal Entities      
Income:      
Dividends from subsidiaries 80,882 130,950 127,750
Interest income on notes receivable 1,139 357 922
Interest income (loss) on other investments 9,662 (1,126) (514)
Other 58 5 18
Total income 91,741 130,186 128,176
Expenses:      
Interest expense (Debentures) 2,792 3,832 6,435
Provision for credit loss   27  
Other 2,272 1,988 2,749
Total expenses 5,064 5,847 9,184
Income before federal income taxes and equity in undistributed net income of subsidiaries 86,677 124,339 118,992
Income tax expense (benefit) 1,358 (1,339) (1,878)
Income before equity in undistributed net income of subsidiaries 85,319 125,678 120,870
Equity in undistributed net income of subsidiaries 168,603 41,641 84,234
Net income $ 253,922 $ 167,319 $ 205,104