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International Bancshares Corporation (Parent Company Only) Financial Information Statements of Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Expenses: |  |  |
Interest expense (Debentures) | $ 6,435 | $ 6,989 | $ 5,392
Income before federal income taxes and equity in undistributed net income of subsidiaries | 259,954 | 272,583 | 221,642
Income tax expense | 54,850 | 56,652 | 64,206
Net income | 205,104 | 215,931 | 157,436
Parent Company | Reportable Legal Entities |  |  |
Income: |  |  |
Dividends from subsidiaries | 127,750 | 105,000 | 64,600
Interest income on notes receivable | 922 |  |
Interest income on other investments | (514) | 8,208 | 8,100
Other | 18 | 1,988 | 26
Total income | 128,176 | 115,196 | 72,726
Expenses: |  |  |
Interest expense (Debentures) | 6,435 | 6,989 | 5,392
Other | 2,749 | 2,930 | 5,648
Total expenses | 9,184 | 9,919 | 11,040
Income before federal income taxes and equity in undistributed net income of subsidiaries | 118,992 | 105,277 | 61,686
Income tax expense | (1,878) | 481 | (2,076)
Income before equity in undistributed net income of subsidiaries | 120,870 | 104,796 | 63,762
Equity in undistributed net income of subsidiaries | 84,234 | 111,135 | 93,674
Net income | $ 205,104 | $ 215,931 | $ 157,436

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