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International Bancshares Corporation (Parent Company Only) Financial Information Statements of Condition (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
ASSETS        
Other investments $ 356,735 $ 343,452    
Notes loans 8,653,289 7,901,892    
Goodwill 282,532 282,532    
Other assets 292,496 250,215    
Total assets 15,738,852 15,066,189    
Liabilities:        
Junior subordinated deferrable interest debentures 108,868 108,868    
Other liabilities 175,570 143,832    
Total liabilities 12,942,145 12,618,415    
Shareholders' equity:        
Common shares 96,617 96,467    
Surplus 159,333 155,511    
Retained earnings 3,356,177 3,029,088    
Accumulated other comprehensive loss (379,054) (397,889)    
Total shareholders' equity before treasury stock 3,233,073 2,883,177    
Less cost of shares in treasury (436,366) (435,403)    
Total shareholders' equity 2,796,707 2,447,774 $ 2,044,759 $ 2,308,481
Total liabilities and shareholders' equity 15,738,852 15,066,189    
Parent Company | Reportable legal entities        
ASSETS        
Cash 65,858 105,184    
Other investments 155,416 111,382    
Notes loans 60,502 62,150    
Investment in subsidiaries 2,622,447 2,281,952    
Goodwill 3,365 3,365    
Other assets 12,744 8,617    
Total assets 2,920,332 2,572,650    
Liabilities:        
Junior subordinated deferrable interest debentures 108,868 108,868    
Due to IBC Trading 21 21    
Other liabilities 14,736 15,987    
Total liabilities 123,625 124,876    
Shareholders' equity:        
Common shares 96,617 96,467    
Surplus 159,333 155,511    
Retained earnings 3,356,177 3,029,088    
Accumulated other comprehensive loss (379,054) (397,889)    
Total shareholders' equity before treasury stock 3,233,073 2,883,177    
Less cost of shares in treasury (436,366) (435,403)    
Total shareholders' equity 2,796,707 2,447,774    
Total liabilities and shareholders' equity $ 2,920,332 $ 2,572,650