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International Bancshares Corporation (Parent Company Only) Financial Information Statements of Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Expenses: |  |  |
Interest expense (Debentures) | $ 5,037 | $ 2,791 | $ 3,832
Provision for credit loss | 21,651 | 7,955 | 45,379
Income before federal income taxes and equity in undistributed net income of subsidiaries | 382,639 | 322,327 | 211,758
Income tax expense (benefit) | 82,407 | 68,405 | 44,439
Net income | 300,232 | 253,922 | 167,319
Parent Company | Reportable Legal Entities |  |  |
Income: |  |  |
Dividends from subsidiaries | 222,175 | 80,882 | 130,950
Interest income on notes receivable | 2,394 | 1,139 | 357
Interest income (loss) on other investments | 8,662 | 9,662 | (1,126)
Other | 857 | 58 | 5
Total income | 234,088 | 91,741 | 130,186
Expenses: |  |  |
Interest expense (Debentures) | 5,037 | 2,792 | 3,832
Provision for credit loss | 437 |  | 27
Other | 2,291 | 2,272 | 1,988
Total expenses | 7,765 | 5,064 | 5,847
Income before federal income taxes and equity in undistributed net income of subsidiaries | 226,323 | 86,677 | 124,339
Income tax expense (benefit) | 504 | 1,358 | (1,339)
Income before equity in undistributed net income of subsidiaries | 225,819 | 85,319 | 125,678
Equity in undistributed net income of subsidiaries | 74,413 | 168,603 | 41,641
Net income | $ 300,232 | $ 253,922 | $ 167,319

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