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International Bancshares Corporation (Parent Company Only) Financial Information Statements of Condition (Details) - USD ($) | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Other investments | $ 343,452,000 | $ 358,910,000 |  |
Notes loans | 7,901,892,000 | 7,304,631,000 |  |
Goodwill | 282,532,000 | 282,532,000 |  |
Other assets | 250,215,000 | 263,137,000 |  |
Total assets | 15,066,189,000 | 15,501,476,000 |  |
Liabilities: |  |  |  |
Junior subordinated deferrable interest debentures | 108,868,000 | 134,642,000 |  |
Other liabilities | 143,832,000 | 219,933,000 |  |
Total liabilities | 12,618,415,000 | 13,456,717,000 |  |
Shareholders' equity: |  |  |  |
Common shares | 96,467,000 | 96,420,000 |  |
Surplus | 155,511,000 | 154,061,000 |  |
Retained earnings | 3,029,088,000 | 2,695,567,000 |  |
Accumulated other comprehensive income (loss) | (397,889,000) | (470,497,000) |  |
Total shareholders' equity before treasury stock | 2,883,177,000 | 2,475,551,000 |  |
Less cost of shares in treasury | (435,403,000) | (430,792,000) |  |
Total shareholders' equity | 2,447,774,000 | 2,044,759,000 | $ 2,308,481,000 | $ 2,177,998,000
Total liabilities and shareholders' equity | 15,066,189,000 | 15,501,476,000 |  |
Parent Company | Reportable Legal Entities |  |  |  |
ASSETS |  |  |  |
Cash | 105,184,000 | 89,263,000 |  |
Other investments | 111,382,000 | 114,901,000 |  |
Notes loans | 62,150,000 | 42,519,000 |  |
Investment in subsidiaries | 2,281,952,000 | 1,933,269,000 |  |
Goodwill | 3,365,000 | 3,365,000 |  |
Other assets | 8,617,000 | 7,181,000 |  |
Total assets | 2,572,650,000 | 2,190,498,000 |  |
Liabilities: |  |  |  |
Junior subordinated deferrable interest debentures | 108,868,000 | 134,642,000 |  |
Due to IBC Trading | 21,000 | 21,000 |  |
Other liabilities | 15,987,000 | 11,076,000 |  |
Total liabilities | 124,876,000 | 145,739,000 |  |
Shareholders' equity: |  |  |  |
Common shares | 96,467,000 | 96,420,000 |  |
Surplus | 155,511,000 | 154,061,000 |  |
Retained earnings | 3,029,088,000 | 2,695,567,000 |  |
Accumulated other comprehensive income (loss) | (397,889,000) | (470,497,000) |  |
Total shareholders' equity before treasury stock | 2,883,177,000 | 2,475,551,000 |  |
Less cost of shares in treasury | (435,403,000) | (430,792,000) |  |
Total shareholders' equity | 2,447,774,000 | 2,044,759,000 |  |
Total liabilities and shareholders' equity | $ 2,572,650,000 | $ 2,190,498,000 |  |

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