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International Bancshares Corporation (Parent Company Only) Financial Information Statements of Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Expenses:      
Interest expense (Debentures) $ 3,832 $ 6,435 $ 6,989
Provision for credit loss 45,379 18,843 6,112
Income before federal income taxes and equity in undistributed net income of subsidiaries 211,758 259,954 272,583
Income tax expense 44,439 54,850 56,652
Net income 167,319 205,104 215,931
Parent Company [Member] | Reportable Legal Entities      
Income:      
Dividends from subsidiaries 130,950 127,750 105,000
Interest income on notes receivable 357 922  
Interest income on other investments (1,126) (514) 8,208
Other 5 18 1,988
Total income 130,186 128,176 115,196
Expenses:      
Interest expense (Debentures) 3,832 6,435 6,989
Provision for credit loss 27    
Other 1,988 2,749 2,930
Total expenses 5,847 9,184 9,919
Income before federal income taxes and equity in undistributed net income of subsidiaries 124,339 118,992 105,277
Income tax expense (1,339) (1,878) 481
Income before equity in undistributed net income of subsidiaries 125,678 120,870 104,796
Equity in undistributed net income of subsidiaries 41,641 84,234 111,135
Net income $ 167,319 $ 205,104 $ 215,931