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v3.3.1.900

International Bancshares Corporation (Parent Company Only) Financial Information Quarterly (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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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
Consolidated Statements of Income |  |  |  |  |  |  |  |  |  |  |
Total interest income | $ 97,923 | $ 100,724 | $ 98,975 | $ 99,132 | $ 98,664 | $ 97,958 | $ 99,340 | $ 97,637 | $ 396,754 | $ 393,599 | $ 363,217
Total interest expense | 10,730 | 11,133 | 11,210 | 11,244 | 11,461 | 11,575 | 11,634 | 11,873 | 44,317 | 46,543 | 54,632
Net interest income | 87,193 | 89,591 | 87,765 | 87,888 | 87,203 | 86,383 | 87,706 | 85,764 | 352,437 | 347,056 | 308,585
Provision for probable loan losses | 5,429 | 8,832 | 7,767 | 2,377 | 5,884 | 2,816 | 3,645 | 2,078 | 24,405 | 14,423 | 22,968
Total non-interest income | 35,734 | 43,022 | 40,144 | 36,834 | 42,226 | 36,483 | 41,453 | 58,186 | 155,734 | 178,348 | 189,605
Total non-interest expense | 66,132 | 74,898 | 68,271 | 67,623 | 64,560 | 70,157 | 68,630 | 77,696 | 276,924 | 281,043 | 292,632
Income before income taxes | 51,366 | 48,883 | 51,871 | 54,722 | 58,985 | 49,893 | 56,884 | 64,176 | 206,842 | 229,938 | 182,590
Provision for income taxes | 16,393 | 16,864 | 17,996 | 18,863 | 20,432 | 16,660 | 19,165 | 20,530 | 70,116 | 76,787 | 56,239
Net income available to common shareholders | $ 34,973 | $ 32,019 | $ 33,875 | $ 35,859 | $ 38,553 | $ 33,233 | $ 37,719 | $ 43,646 | $ 136,726 | $ 153,151 | $ 126,351
Basic EPS |  |  |  |  |  |  |  |  |  |  |
Net income (in dollars per share) | $ 0.53 | $ 0.48 | $ 0.51 | $ 0.54 | $ 0.58 | $ 0.50 | $ 0.56 | $ 0.65 | $ 2.06 | $ 2.29 | $ 1.88
Diluted EPS |  |  |  |  |  |  |  |  |  |  |
Net income (in dollars per share) | $ 0.52 | $ 0.48 | $ 0.51 | $ 0.54 | $ 0.57 | $ 0.50 | $ 0.56 | $ 0.65 | $ 2.05 | $ 2.28 | $ 1.88

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