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International Bancshares Corporation (Parent Company Only) Financial Information Statements of Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Expenses: |  |  |
Interest expense (Debentures) | $ 8,123 | $ 5,037 | $ 2,791
Provision for credit loss | 34,576 | 21,651 | 7,955
Income before federal income taxes and equity in undistributed net income of subsidiaries | 523,512 | 382,639 | 322,327
Income tax (benefit) expense | 111,744 | 82,407 | 68,405
Net income | 411,768 | 300,232 | 253,922
Parent Company | Reportable Legal Entities |  |  |
Income: |  |  |
Dividends from subsidiaries | 179,000 | 222,175 | 80,882
Interest income on notes receivable | 5,769 | 2,394 | 1,139
(Loss) income on other investments | (6,150) | 8,662 | 9,662
Other | 4 | 857 | 58
Total income | 178,623 | 234,088 | 91,741
Expenses: |  |  |
Interest expense (Debentures) | 8,122 | 5,037 | 2,792
Provision for credit loss | 500 | 437 |
Other | 252 | 2,291 | 2,272
Total expenses | 8,874 | 7,765 | 5,064
Income before federal income taxes and equity in undistributed net income of subsidiaries | 169,749 | 226,323 | 86,677
Income tax (benefit) expense | (1,365) | 504 | 1,358
Income before equity in undistributed net income of subsidiaries | 171,114 | 225,819 | 85,319
Equity in undistributed net income of subsidiaries | 240,654 | 74,413 | 168,603
Net income | $ 411,768 | $ 300,232 | $ 253,922

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