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Note 20 - Condensed Financial Information of Cathay General Bancorp (Detail) - Balance Sheets (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
--- | --- | --- | --- | ---
Assets |  |  |  |
Cash | $ 144,909 | $ 117,888 | $ 87,347 | $ 100,124
Other assets | 166,595 | 206,768 |  |
Total assets | 10,694,089 | 10,644,864 |  |
Liabilities |  |  |  |
Junior subordinated debt | 121,136 |  |  |
Other liabilities | 54,040 | 46,864 |  |
Total liabilities | 9,064,585 | 9,129,231 |  |
Stockholders' equity |  |  |  |
Preferred stock, 10,000,000 shares authorized, 258,000 issued and outstanding at December 31, 2012, and December 31, 2011 | 254,580 | 250,992 |  |
Common stock, $0.01 par value, 100,000,000 shares authorized, 82,985,853 issued and 78,778,288 outstanding at December 31, 2012, and 82,860,122 issued and 78,652,557 outstanding at December 31, 2011 | 830 | 829 |  |
Additional paid-in-capital | 768,925 | 765,641 |  |
Accumulated other comprehensive loss, net | 465 | (8,732) |  |
Retained earnings | 721,993 | 624,192 |  |
Treasury stock, at cost (4,207,565 shares at December 31, 2012, and at December 31, 2011) | 125,736 | 125,736 |  |
Total stockholders' equity | 1,621,057 | 1,507,186 |  |
Total liabilities and stockholders' equity | 10,694,089 | 10,644,864 |  |
Bank Subsidiaries [Member] | Parent Company [Member] |  |  |  |
Assets |  |  |  |
Investment in subsidiaries | 1,569,902 | 1,593,831 |  |
Non-Bank Subsidiaries [Member] | Parent Company [Member] |  |  |  |
Assets |  |  |  |
Investment in subsidiaries | 2,598 | 2,615 |  |
Parent Company [Member] |  |  |  |
Assets |  |  |  |
Cash | 639 | 809 |  |
Short-term certificates of deposit | 161,300 | 19,000 |  |
Other assets | 9,936 | 14,189 |  |
Total assets | 1,744,375 | 1,630,444 |  |
Liabilities |  |  |  |
Junior subordinated debt | 121,136 | 121,136 |  |
Other liabilities | 2,182 | 2,122 |  |
Total liabilities | 123,318 | 123,258 |  |
Stockholders' equity |  |  |  |
Preferred stock, 10,000,000 shares authorized, 258,000 issued and outstanding at December 31, 2012, and December 31, 2011 | 254,580 | 250,992 |  |
Common stock, $0.01 par value, 100,000,000 shares authorized, 82,985,853 issued and 78,778,288 outstanding at December 31, 2012, and 82,860,122 issued and 78,652,557 outstanding at December 31, 2011 | 830 | 829 |  |
Additional paid-in-capital | 768,925 | 765,641 |  |
Accumulated other comprehensive loss, net | 465 | (8,732) |  |
Retained earnings | 721,993 | 624,192 |  |
Treasury stock, at cost (4,207,565 shares at December 31, 2012, and at December 31, 2011) | (125,736) | (125,736) |  |
Total stockholders' equity | 1,621,057 | 1,507,186 |  |
Total liabilities and stockholders' equity | $ 1,744,375 | $ 1,630,444 |  |

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