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Note 22 - Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 2015
Disclosure Text Block [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] |
|  | Cathay General Bancorp |  |  | Cathay Bank |
|  | December 31, 2015 |  |  | December 31, 2014 |  |  | December 31, 2015 |  |  | December 31, 2014 |
(Dollars in thousands) |  | Balance |  |  | % |  |  | Balance |  |  | % |  |  | Balance |  |  | % |  |  | Balance |  |  | % |
Common equtiy Tier 1 capital ( to risk-weighted assets) |  | $ | 1,383,377 |  |  |  | 12.95 |  |  |  | n/a |  |  |  | n/a |  |  | $ | 1,443,159 |  |  |  | 13.54 |  |  |  | n/a |  |  |  | n/a |
Common equtiy Tier 1 capital minimum requirement |  |  | 480,830 |  |  |  | 4.50 |  |  |  | n/a |  |  |  | n/a |  |  |  | 479,801 |  |  |  | 4.50 |  |  |  | n/a |  |  |  | n/a |
Excess |  | $ | 902,547 |  |  |  | 8.45 |  |  |  | n/a |  |  |  | n/a |  |  | $ | 963,358 |  |  |  | 9.04 |  |  |  | n/a |  |  |  | n/a |
Tier 1 capital (to risk-weighted assets) |  | $ | 1,498,810 |  |  |  | 14.03 |  |  | $ | 1,406,511 |  |  |  | 14.96 |  |  | $ | 1,443,159 |  |  |  | 13.54 |  |  | $ | 1,353,481 |  |  |  | 14.42 |
Tier 1 capital minimum requirement |  |  | 641,107 |  |  |  | 6.00 |  |  |  | 376,072 |  |  |  | 4.00 |  |  |  | 639,735 |  |  |  | 6.00 |  |  |  | 375,318 |  |  |  | 4.00 |
Excess |  | $ | 857,703 |  |  |  | 8.03 |  |  | $ | 1,030,439 |  |  |  | 10.96 |  |  | $ | 803,424 |  |  |  | 7.54 |  |  | $ | 978,163 |  |  |  | 10.42 |
Total capital (to risk-weighted assets) |  | $ | 1,634,631 |  |  |  | 15.30 |  |  | $ | 1,524,702 |  |  |  | 16.22 |  |  | $ | 1,576,525 |  |  |  | 14.79 |  |  | $ | 1,471,337 |  |  |  | 15.68 |
Total capital minimum requirement |  |  | 854,809 |  |  |  | 8.00 |  |  |  | 752,144 |  |  |  | 8.00 |  |  |  | 852,980 |  |  |  | 8.00 |  |  |  | 750,637 |  |  |  | 8.00 |
Excess |  | $ | 779,822 |  |  |  | 7.30 |  |  | $ | 772,558 |  |  |  | 8.22 |  |  | $ | 723,545 |  |  |  | 6.79 |  |  | $ | 720,700 |  |  |  | 7.68 |
Tier 1 capital (to average assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
– Leverage ratio |  | $ | 1,498,810 |  |  |  | 11.95 |  |  | $ | 1,406,511 |  |  |  | 12.99 |  |  | $ | 1,443,159 |  |  |  | 11.53 |  |  | $ | 1,353,481 |  |  |  | 12.52 |
Minimum leverage requirement |  |  | 501,875 |  |  |  | 4.00 |  |  |  | 433,121 |  |  |  | 4.00 |  |  |  | 500,455 |  |  |  | 4.00 |  |  |  | 432,350 |  |  |  | 4.00 |
Excess |  | $ | 996,935 |  |  |  | 7.95 |  |  | $ | 973,390 |  |  |  | 8.99 |  |  | $ | 942,704 |  |  |  | 7.53 |  |  | $ | 921,131 |  |  |  | 8.52 |
Risk-weighted assets |  | $ | 10,685,115 |  |  |  |  |  |  | $ | 9,401,803 |  |  |  |  |  |  | $ | 10,662,248 |  |  |  |  |  |  | $ | 9,382,961 |  |  |  |  |
Total average assets (1) |  | $ | 12,546,879 |  |  |  |  |  |  | $ | 10,828,015 |  |  |  |  |  |  | $ | 12,511,382 |  |  |  |  |  |  | $ | 10,808,747 |  |  |  |  |

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