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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 |  |

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