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International Bancshares Corporation (Parent Company Only) Financial Information Statements of Condition (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
ASSETS        
Other investments $ 571,415 $ 517,162    
Other assets 81,529 95,593    
Total assets 12,184,698 11,804,041    
Liabilities:        
Junior subordinated deferrable interest debentures 160,416 160,416    
Other liabilities 91,380 70,509    
Total liabilities 10,345,718 10,079,374    
Shareholders' equity:        
Common shares 96,019 95,910    
Surplus 171,816 169,567    
Retained earnings 1,891,805 1,777,963    
Accumulated other comprehensive (loss) income (28,397) (26,697)    
Total shareholders' equity before treasury stock 2,131,243 2,016,743    
Less cost of shares in treasury (292,263) (292,076)    
Total shareholders' equity 1,838,980 1,724,667 $ 1,665,503 $ 1,580,658
Total liabilities and shareholders' equity 12,184,698 11,804,041    
Parent Company        
ASSETS        
Cash 18,398 18,555    
Other investments 92,620 94,908    
Investment in subsidiaries 1,878,521 1,787,120    
Other assets 23,120 1,098    
Total assets 2,012,659 1,901,681    
Liabilities:        
Junior subordinated deferrable interest debentures 160,416 160,416    
Due to IBC Trading 21 21    
Other liabilities 13,242 16,577    
Total liabilities 173,679 177,014    
Shareholders' equity:        
Common shares 96,019 95,910    
Surplus 171,816 169,567    
Retained earnings 1,891,805 1,777,963    
Accumulated other comprehensive (loss) income (28,397) (26,697)    
Total shareholders' equity before treasury stock 2,131,243 2,016,743    
Less cost of shares in treasury (292,263) (292,076)    
Total shareholders' equity 1,838,980 1,724,667    
Total liabilities and shareholders' equity $ 2,012,659 $ 1,901,681