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International Bancshares Corporation (Parent Company Only) Financial Information Statements of Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Expenses: |  |  |  |  |  |  |  |  |  |  |
Interest expense (Debentures) |  |  |  |  |  |  |  |  | $ 4,099 | $ 4,264 | $ 4,665
Income before federal income taxes and equity in undistributed net income of subsidiaries | $ 51,366 | $ 48,883 | $ 51,871 | $ 54,722 | $ 58,985 | $ 49,893 | $ 56,884 | $ 64,176 | 206,842 | 229,938 | 182,590
Income tax expense (benefit) | $ 16,393 | $ 16,864 | $ 17,996 | $ 18,863 | $ 20,432 | $ 16,660 | $ 19,165 | $ 20,530 | 70,116 | 76,787 | 56,239
Net income |  |  |  |  |  |  |  |  | 136,726 | 153,151 | 126,351
Parent Company |  |  |  |  |  |  |  |  |  |  |
Income: |  |  |  |  |  |  |  |  |  |  |
Dividends from subsidiaries |  |  |  |  |  |  |  |  | 51,575 | 71,389 | 30,000
Interest income on notes receivable |  |  |  |  |  |  |  |  | 7 | 15 | 18
Interest income on other investments |  |  |  |  |  |  |  |  | 5,738 | 6,862 | 12,301
Other |  |  |  |  |  |  |  |  | 3,442 | 1,923 | 26
Total income |  |  |  |  |  |  |  |  | 60,762 | 80,189 | 42,345
Expenses: |  |  |  |  |  |  |  |  |  |  |
Interest expense (Debentures) |  |  |  |  |  |  |  |  | 4,099 | 4,264 | 4,665
Other |  |  |  |  |  |  |  |  | 3,037 | 1,099 | 1,889
Total expenses |  |  |  |  |  |  |  |  | 7,136 | 5,363 | 6,554
Income before federal income taxes and equity in undistributed net income of subsidiaries |  |  |  |  |  |  |  |  | 53,626 | 74,826 | 35,791
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 386 | 1,370 | 2,529
Income before equity in undistributed net income of subsidiaries |  |  |  |  |  |  |  |  | 53,240 | 73,456 | 33,262
Equity in undistributed (distributed) net income of subsidiaries |  |  |  |  |  |  |  |  | 83,486 | 79,695 | 93,089
Net income |  |  |  |  |  |  |  |  | $ 136,726 | $ 153,151 | $ 126,351

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