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International Bancshares Corporation (Parent Company Only) Financial Information Statements of Condition (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
ASSETS        
Other investments $ 337,507,000 $ 293,990,000    
Other assets 190,376,000 81,529,000    
Total assets 11,871,952,000 12,184,698,000    
Liabilities:        
Junior subordinated deferrable interest debentures 160,416,000 160,416,000    
Other liabilities 139,755,000 91,380,000    
Total liabilities 9,932,370,000 10,345,718,000    
Shareholders' equity:        
Common shares 96,104,000 96,019,000    
Surplus 145,283,000 171,816,000    
Retained earnings 2,064,134,000 1,891,805,000    
Accumulated other comprehensive (loss) income (54,634,000) (28,397,000)    
Total shareholders' equity before treasury stock 2,250,887,000 2,131,243,000    
Less cost of shares in treasury (311,305,000) (292,263,000)    
Total shareholders' equity 1,939,582,000 1,838,980,000 $ 1,724,667,000 $ 1,665,503,000
Total liabilities and shareholders' equity 11,871,952,000 12,184,698,000    
Parent Company | Reportable Legal Entities        
ASSETS        
Cash 19,065,000 18,398,000    
Other investments 105,377,000 92,620,000    
Investment in subsidiaries 1,987,293,000 1,878,521,000    
Other assets   23,120,000    
Total assets 2,111,735,000 2,012,659,000    
Liabilities:        
Junior subordinated deferrable interest debentures 160,416,000 160,416,000    
Due to IBC Trading 21,000 21,000    
Other liabilities 11,716,000 13,242,000    
Total liabilities 172,153,000 173,679,000    
Shareholders' equity:        
Common shares 96,104,000 96,019,000    
Surplus 145,283,000 171,816,000    
Retained earnings 2,064,134,000 1,891,805,000    
Accumulated other comprehensive (loss) income (54,634,000) (28,397,000)    
Total shareholders' equity before treasury stock 2,250,887,000 2,131,243,000    
Less cost of shares in treasury (311,305,000) (292,263,000)    
Total shareholders' equity 1,939,582,000 1,838,980,000    
Total liabilities and shareholders' equity $ 2,111,735,000 $ 2,012,659,000