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International Bancshares Corporation (Parent Company Only) Financial Information Statements of Condition (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
ASSETS        
Other investments $ 254,413 $ 318,427    
Notes loans 7,432,695 6,834,668    
Goodwill 282,532 282,532    
Other assets 162,079 200,121    
Total assets 14,029,467 12,112,894    
Liabilities:        
Junior subordinated deferrable interest debentures 134,642 134,642    
Other liabilities 130,492 171,118    
Total liabilities 11,851,469 9,994,841    
Shareholders' equity:        
Common shares 96,241 96,215    
Surplus 149,334 148,075    
Retained earnings 2,289,626 2,200,568    
Accumulated other comprehensive income (loss) 20,825 2,345    
Total shareholders' equity before treasury stock 2,556,026 2,447,203    
Less cost of shares in treasury (378,028) (329,150)    
Total shareholders' equity 2,177,998 2,118,053 $ 1,939,582 $ 1,838,980
Total liabilities and shareholders' equity 14,029,467 12,112,894    
Parent Company [Member] | Reportable Legal Entities        
ASSETS        
Cash 66,252 24,290    
Other investments 77,661 106,284    
Notes loans 11,950 12,100    
Investment in subsidiaries 2,167,516 2,120,391    
Goodwill 3,365 3,365    
Other assets   264    
Total assets 2,326,744 2,266,694    
Liabilities:        
Junior subordinated deferrable interest debentures 134,642 134,642    
Due to IBC Trading 21 21    
Other liabilities 14,083 13,978    
Total liabilities 148,746 148,641    
Shareholders' equity:        
Common shares 96,241 96,215    
Surplus 149,334 148,075    
Retained earnings 2,289,626 2,200,568    
Accumulated other comprehensive income (loss) 20,825 2,345    
Total shareholders' equity before treasury stock 2,556,026 2,447,203    
Less cost of shares in treasury (378,028) (329,150)    
Total shareholders' equity 2,177,998 2,118,053    
Total liabilities and shareholders' equity $ 2,326,744 $ 2,266,694