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Note 20 - Condensed Financial Information of Cathay General Bancorp (Details) - Balance Sheets - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | May. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | --- | --- | --- | ---
Assets |  |  |  |  |
Cash | $ 180,130 | $ 176,830 |  | $ 153,747 | $ 144,909
Short-term certificates of deposit | 536,880 | 489,614 |  |  |
Securities available for sale | 1,586,352 | 1,318,935 |  |  |
Other assets | 147,284 | 143,106 |  |  |
Total assets | 13,254,126 | 11,516,846 |  |  |
Liabilities |  |  |  |  |
Junior subordinated debt | 119,136 |  | $ 119,100 |  |
Other liabilities | 144,197 | 80,772 |  |  |
Total liabilities | 11,506,348 | 9,913,958 |  |  |
Stockholders' equity |  |  |  |  |
Common stock, $0.01 par value, 100,000,000 shares authorized, 87,002,931 issued and 80,806,116 outstanding at December 31, 2015, and 84,022,118 issued and 79,814,553 outstanding at December 31, 2014 | 870 | 840 |  |  |
Additional paid-in-capital | 880,822 | 789,519 |  |  |
Accumulated other comprehensive loss, net | (8,426) | (5,569) |  | (29,729) |
Retained earnings | 1,059,660 | 943,834 |  |  |
Treasury stock, at cost (6,196,815 shares at December 31, 2015, and 4,207,565 shares at December 31, 2014) | (185,148) | (125,736) |  |  |
Total stockholders' equity | 1,747,778 | 1,602,888 |  |  |
Total liabilities and stockholders' equity | 13,254,126 | 11,516,846 |  |  |
Parent Company [Member] |  |  |  |  |
Assets |  |  |  |  |
Cash | 5,048 | 7,420 |  | $ 1,835 | $ 639
Cash pledged as margin for interest rate swaps | 7,936 | 7,465 |  |  |
Short-term certificates of deposit | 24,324 | 23,203 |  |  |
Securities available for sale | 11,911 | 10,244 |  |  |
Other assets | 9,551 | 9,541 |  |  |
Total assets | 1,872,574 | 1,726,742 |  |  |
Liabilities |  |  |  |  |
Junior subordinated debt | 119,136 | 119,136 |  |  |
Other liabilities | 5,660 | 4,718 |  |  |
Total liabilities | 124,796 | 123,854 |  |  |
Stockholders' equity |  |  |  |  |
Common stock, $0.01 par value, 100,000,000 shares authorized, 87,002,931 issued and 80,806,116 outstanding at December 31, 2015, and 84,022,118 issued and 79,814,553 outstanding at December 31, 2014 | 870 | 840 |  |  |
Additional paid-in-capital | 880,822 | 789,519 |  |  |
Accumulated other comprehensive loss, net | (8,426) | (5,569) |  |  |
Retained earnings | 1,059,660 | 943,834 |  |  |
Treasury stock, at cost (6,196,815 shares at December 31, 2015, and 4,207,565 shares at December 31, 2014) | (185,148) | (125,736) |  |  |
Total stockholders' equity | 1,747,778 | 1,602,888 |  |  |
Total liabilities and stockholders' equity | 1,872,574 | 1,726,742 |  |  |
Bank Subsidiaries [Member] | Parent Company [Member] |  |  |  |  |
Assets |  |  |  |  |
Investment in subsidiaries | 1,807,825 | 1,666,238 |  |  |
Non-Bank Subsidiaries [Member] | Parent Company [Member] |  |  |  |  |
Assets |  |  |  |  |
Investment in subsidiaries | $ 5,979 | $ 2,631 |  |  |

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