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International Bancshares Corporation (Parent Company Only) Financial Information Statements of Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Expenses: |  |  |
Interest expense (Debentures) | $ 7,762 | $ 8,123 | $ 5,037
Provision for credit loss | 31,802 | 34,576 | 21,651
Income before federal income taxes and equity in undistributed net income of subsidiaries | 508,720 | 523,512 | 382,639
Income tax (benefit) expense | 99,553 | 111,744 | 82,407
Net income | 409,167 | 411,768 | 300,232
Parent Company | Reportable legal entities |  |  |
Income: |  |  |
Dividends from subsidiaries | 130,000 | 179,000 | 222,175
Interest income on notes receivable | 7,602 | 5,769 | 2,394
(Loss) income on other investments | (3,356) | (6,150) | 8,662
Other | 1,059 | 4 | 857
Total income | 135,305 | 178,623 | 234,088
Expenses: |  |  |
Interest expense (Debentures) | 7,762 | 8,122 | 5,037
Provision for credit loss | 625 | 500 | 437
Other | 6,252 | 252 | 2,291
Total expenses | 14,639 | 8,874 | 7,765
Income before federal income taxes and equity in undistributed net income of subsidiaries | 120,666 | 169,749 | 226,323
Income tax (benefit) expense | (833) | (1,365) | 504
Income before equity in undistributed net income of subsidiaries | 121,499 | 171,114 | 225,819
Equity in undistributed net income of subsidiaries | 287,668 | 240,654 | 74,413
Net income | $ 409,167 | $ 411,768 | $ 300,232

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