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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 |  |

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