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International Bancshares Corporation (Parent Company Only) Financial Information Statements of Condition (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2008
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Other investments | $ 351,209 | $ 360,955 |  |
Other assets | 161,133 | 165,821 |  |
Total assets | 11,739,649 | 11,943,469 |  |
Liabilities: |  |  |  |
Junior subordinated deferrable interest debentures | 190,726 | 201,117 |  |
Other liabilities | 159,876 | 223,527 |  |
Total liabilities | 10,139,484 | 10,484,252 |  |
Shareholders' equity: |  |  |  |
Preferred shares | 210,548 | 208,068 |  |
Common shares | 95,720 | 95,711 |  |
Surplus | 162,767 | 162,276 |  |
Retained earnings | 1,302,964 | 1,214,743 |  |
Accumulated other comprehensive income (including $(6,889) and $(6,870) of comprehensive loss related to other-than-temporary impairment for non-credit related issues) | 84,959 | 28,777 |  |
Total shareholders' equity before treasury stock | 1,856,958 | 1,709,575 |  |
Less cost of shares in treasury | (256,793) | (250,358) |  |
Total shareholders' equity | 1,600,165 | 1,459,217 | 1,407,470 | 1,257,297
Total liabilities and shareholders' equity | 11,739,649 | 11,943,469 |  |
Parent Company |  |  |  |
ASSETS |  |  |  |
Cash | 13,668 | 24,414 |  |
Other investments | 70,318 | 65,485 |  |
Notes receivable | 495 | 250 |  |
Investment in subsidiaries | 1,712,336 | 1,577,038 |  |
Other assets | 1,567 | 3,874 |  |
Total assets | 1,798,384 | 1,671,061 |  |
Liabilities: |  |  |  |
Junior subordinated deferrable interest debentures | 190,726 | 201,117 |  |
Due to IBC Trading | 21 | 21 |  |
Other liabilities | 7,472 | 10,706 |  |
Total liabilities | 198,219 | 211,844 |  |
Shareholders' equity: |  |  |  |
Preferred shares | 210,548 | 208,068 |  |
Common shares | 95,720 | 95,711 |  |
Surplus | 162,767 | 162,276 |  |
Retained earnings | 1,302,964 | 1,214,743 |  |
Accumulated other comprehensive income (including $(6,889) and $(6,870) of comprehensive loss related to other-than-temporary impairment for non-credit related issues) | 84,959 | 28,777 |  |
Total shareholders' equity before treasury stock | 1,856,958 | 1,709,575 |  |
Less cost of shares in treasury | (256,793) | (250,358) |  |
Total shareholders' equity | 1,600,165 | 1,459,217 |  |
Total liabilities and shareholders' equity | $ 1,798,384 | $ 1,671,061 |  |

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