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International Bancshares Corporation (Parent Company Only) Financial Information Statements of Income (Tables) | 12 Months Ended
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Dec. 31, 2020
Schedule of condensed statements of income of Parent Company | (Dollars in Thousands) ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 |  | 2018 |
Income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Dividends from subsidiaries | ​ | $ | 130,950 | ​ | $ | 127,750 | ​ | $ | 105,000 | ​
Interest income on notes receivable | ​ |  | 357 | ​ |  | 922 | ​ |  | — | ​
Interest income on other investments | ​ |  | (1,126) | ​ |  | (514) | ​ |  | 8,208 | ​
Other | ​ |  | 5 | ​ |  | 18 | ​ |  | 1,988 | ​
Total income | ​ |  | 130,186 | ​ |  | 128,176 | ​ |  | 115,196 | ​
Expenses: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest expense (Debentures) | ​ |  | 3,832 | ​ |  | 6,435 | ​ |  | 6,989 | ​
Provision for credit loss | ​ | ​ | 27 | ​ | ​ | — | ​ | ​ | — | ​
Other | ​ |  | 1,988 | ​ |  | 2,749 | ​ |  | 2,930 | ​
Total expenses | ​ |  | 5,847 | ​ |  | 9,184 | ​ |  | 9,919 | ​
Income before federal income taxes and equity in undistributed net income of subsidiaries | ​ |  | 124,339 | ​ |  | 118,992 | ​ |  | 105,277 | ​
Income tax expense | ​ |  | (1,339) | ​ |  | (1,878) | ​ |  | 481 | ​
Income before equity in undistributed net income of subsidiaries | ​ |  | 125,678 | ​ |  | 120,870 | ​ |  | 104,796 | ​
Equity in undistributed net income of subsidiaries | ​ |  | 41,641 | ​ |  | 84,234 | ​ |  | 111,135 | ​
Net income | ​ | $ | 167,319 | ​ | $ | 205,104 | ​ | $ | 215,931 | ​

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- Definition Tabular disclosure of condensed statements of income of the registrant (parent company) as of the same dates or for the same periods for which audited consolidated financial statements are being presented. Alternatively, the details of this disclosure can be reported by the specific parent company taxonomy elements, indicating the appropriate date and period contexts in an instance document. + References No definition available. + Details
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