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International Bancshares Corporation (Parent Company Only) Financial Information Statements of Condition (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Other investments | $ 372,739 | $ 351,209 |  |
Other assets | 179,936 | 161,133 |  |
Total assets | 11,882,673 | 11,739,649 |  |
Liabilities: |  |  |  |
Junior subordinated deferrable interest debentures | 190,726 | 190,726 |  |
Other liabilities | 90,320 | 159,876 |  |
Total liabilities | 10,446,965 | 10,139,484 |  |
Shareholders' equity: |  |  |  |
Preferred shares |  | 210,548 |  |
Common shares | 95,725 | 95,720 |  |
Surplus | 163,287 | 162,767 |  |
Retained earnings | 1,369,543 | 1,302,964 |  |
Accumulated other comprehensive income | 65,662 | 84,959 |  |
Total shareholders' equity before treasury stock | 1,694,217 | 1,856,958 |  |
Less cost of shares in treasury | (258,509) | (256,793) |  |
Total shareholders' equity | 1,435,708 | 1,600,165 | 1,459,217 | 1,407,470
Total liabilities and shareholders' equity | 11,882,673 | 11,739,649 |  |
Parent Company |  |  |  |
ASSETS |  |  |  |
Cash | 1,539 | 13,668 |  |
Other investments | 63,044 | 70,318 |  |
Notes receivable | 409 | 495 |  |
Investment in subsidiaries | 1,573,679 | 1,712,336 |  |
Other assets | 617 | 1,567 |  |
Total assets | 1,639,288 | 1,798,384 |  |
Liabilities: |  |  |  |
Junior subordinated deferrable interest debentures | 190,726 | 190,726 |  |
Due to IBC Trading | 21 | 21 |  |
Other liabilities | 12,833 | 7,472 |  |
Total liabilities | 203,580 | 198,219 |  |
Shareholders' equity: |  |  |  |
Preferred shares |  | 210,548 |  |
Common shares | 95,725 | 95,720 |  |
Surplus | 163,287 | 162,767 |  |
Retained earnings | 1,369,543 | 1,302,964 |  |
Accumulated other comprehensive income | 65,662 | 84,959 |  |
Total shareholders' equity before treasury stock | 1,694,217 | 1,856,958 |  |
Less cost of shares in treasury | (258,509) | (256,793) |  |
Total shareholders' equity | 1,435,708 | 1,600,165 |  |
Total liabilities and shareholders' equity | $ 1,639,288 | $ 1,798,384 |  |

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