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International Bancshares Corporation (Parent Company Only) Financial Information Statements of Condition (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
ASSETS        
Other investments $ 318,427 $ 337,507    
Goodwill 282,532 282,532    
Other assets 200,121 190,376    
Total assets 12,112,894 11,871,952    
Liabilities:        
Junior subordinated deferrable interest debentures 134,642 160,416    
Other liabilities 171,118 139,755    
Total liabilities 9,994,841 9,932,370    
Shareholders' equity:        
Common shares 96,215 96,104    
Surplus 148,075 145,283    
Retained earnings 2,200,568 2,064,134    
Accumulated other comprehensive income (loss) 2,345 (54,634)    
Total shareholders' equity before treasury stock 2,447,203 2,250,887    
Less cost of shares in treasury (329,150) (311,305)    
Total shareholders' equity 2,118,053 1,939,582 $ 1,838,980 $ 1,724,667
Total liabilities and shareholders' equity 12,112,894 11,871,952    
Parent Company | Reportable Legal Entities        
ASSETS        
Cash 24,290 19,065    
Other investments 106,284 105,377    
Notes receivable 12,100      
Investment in subsidiaries 2,120,391 1,987,293    
Goodwill 3,365      
Other assets 264      
Total assets 2,266,694 2,111,735    
Liabilities:        
Junior subordinated deferrable interest debentures 134,642 160,416    
Due to IBC Trading 21 21    
Other liabilities 13,978 11,716    
Total liabilities 148,641 172,153    
Shareholders' equity:        
Common shares 96,215 96,104    
Surplus 148,075 145,283    
Retained earnings 2,200,568 2,064,134    
Accumulated other comprehensive income (loss) 2,345 (54,634)    
Total shareholders' equity before treasury stock 2,447,203 2,250,887    
Less cost of shares in treasury (329,150) (311,305)    
Total shareholders' equity 2,118,053 1,939,582    
Total liabilities and shareholders' equity $ 2,266,694 $ 2,111,735