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International Bancshares Corporation (Parent Company Only) Financial Information Statements of Condition (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Other investments | $ 356,735 | $ 343,452 |  |
Notes loans | 8,653,289 | 7,901,892 |  |
Goodwill | 282,532 | 282,532 |  |
Other assets | 292,496 | 250,215 |  |
Total assets | 15,738,852 | 15,066,189 |  |
Liabilities: |  |  |  |
Junior subordinated deferrable interest debentures | 108,868 | 108,868 |  |
Other liabilities | 175,570 | 143,832 |  |
Total liabilities | 12,942,145 | 12,618,415 |  |
Shareholders' equity: |  |  |  |
Common shares | 96,617 | 96,467 |  |
Surplus | 159,333 | 155,511 |  |
Retained earnings | 3,356,177 | 3,029,088 |  |
Accumulated other comprehensive loss | (379,054) | (397,889) |  |
Total shareholders' equity before treasury stock | 3,233,073 | 2,883,177 |  |
Less cost of shares in treasury | (436,366) | (435,403) |  |
Total shareholders' equity | 2,796,707 | 2,447,774 | $ 2,044,759 | $ 2,308,481
Total liabilities and shareholders' equity | 15,738,852 | 15,066,189 |  |
Parent Company | Reportable legal entities |  |  |  |
ASSETS |  |  |  |
Cash | 65,858 | 105,184 |  |
Other investments | 155,416 | 111,382 |  |
Notes loans | 60,502 | 62,150 |  |
Investment in subsidiaries | 2,622,447 | 2,281,952 |  |
Goodwill | 3,365 | 3,365 |  |
Other assets | 12,744 | 8,617 |  |
Total assets | 2,920,332 | 2,572,650 |  |
Liabilities: |  |  |  |
Junior subordinated deferrable interest debentures | 108,868 | 108,868 |  |
Due to IBC Trading | 21 | 21 |  |
Other liabilities | 14,736 | 15,987 |  |
Total liabilities | 123,625 | 124,876 |  |
Shareholders' equity: |  |  |  |
Common shares | 96,617 | 96,467 |  |
Surplus | 159,333 | 155,511 |  |
Retained earnings | 3,356,177 | 3,029,088 |  |
Accumulated other comprehensive loss | (379,054) | (397,889) |  |
Total shareholders' equity before treasury stock | 3,233,073 | 2,883,177 |  |
Less cost of shares in treasury | (436,366) | (435,403) |  |
Total shareholders' equity | 2,796,707 | 2,447,774 |  |
Total liabilities and shareholders' equity | $ 2,920,332 | $ 2,572,650 |  |

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