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International Bancshares Corporation (Parent Company Only) Financial Information Quarterly (Tables) | 12 Months Ended
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Dec. 31, 2015
Consolidated Statements of Income |
Condensed Quarterly Income Statements | Condensed Quarterly Income Statements (Dollars in Thousands, Except Per Share Amounts) (Unaudited)
|  | Fourth |  | Third |  | Second |  | First |
|  | Quarter |  | Quarter |  | Quarter |  | Quarter |
2015 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  | $ | 97,923 |  | $ | 100,724 |  | $ | 98,975 |  | $ | 99,132 |
Interest expense |  |  | 10,730 |  |  | 11,133 |  |  | 11,210 |  |  | 11,244 |
Net interest income |  |  | 87,193 |  |  | 89,591 |  |  | 87,765 |  |  | 87,888 |
Provision for probable loan losses |  |  | 5,429 |  |  | 8,832 |  |  | 7,767 |  |  | 2,377 |
Non-interest income |  |  | 35,734 |  |  | 43,022 |  |  | 40,144 |  |  | 36,834 |
Non-interest expense |  |  | 66,132 |  |  | 74,898 |  |  | 68,271 |  |  | 67,623 |
Income before income taxes |  |  | 51,366 |  |  | 48,883 |  |  | 51,871 |  |  | 54,722 |
Income taxes |  |  | 16,393 |  |  | 16,864 |  |  | 17,996 |  |  | 18,863 |
Net income |  | $ | 34,973 |  | $ | 32,019 |  | $ | 33,875 |  | $ | 35,859 |
Per common share: |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 0.53 |  | $ | 0.48 |  | $ | 0.51 |  | $ | 0.54 |
Diluted |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 0.52 |  | $ | 0.48 |  | $ | 0.51 |  | $ | 0.54 |
Condensed Quarterly Income Statements (Dollars in Thousands, Except Per Share Amounts) (Unaudited)
|  |  | Fourth |  |  | Third |  |  | Second |  |  | First |
|  |  | Quarter |  |  | Quarter |  |  | Quarter |  |  | Quarter |
2014 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  | $ | 98,664 |  | $ | 97,958 |  | $ | 99,340 |  | $ | 97,637 |
Interest expense |  |  | 11,461 |  |  | 11,575 |  |  | 11,634 |  |  | 11,873 |
Net interest income |  |  | 87,203 |  |  | 86,383 |  |  | 87,706 |  |  | 85,764 |
Provision for probable loan losses |  |  | 5,884 |  |  | 2,816 |  |  | 3,645 |  |  | 2,078 |
Non-interest income |  |  | 42,226 |  |  | 36,483 |  |  | 41,453 |  |  | 58,186 |
Non-interest expense |  |  | 64,560 |  |  | 70,157 |  |  | 68,630 |  |  | 77,696 |
Income before income taxes |  |  | 58,985 |  |  | 49,893 |  |  | 56,884 |  |  | 64,176 |
Income taxes |  |  | 20,432 |  |  | 16,660 |  |  | 19,165 |  |  | 20,530 |
Net income |  | $ | 38,553 |  | $ | 33,233 |  | $ | 37,719 |  | $ | 43,646 |
Per common share: |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 0.58 |  | $ | 0.50 |  | $ | 0.56 |  | $ | 0.65 |
Diluted |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 0.57 |  | $ | 0.50 |  | $ | 0.56 |  | $ | 0.65 |

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