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Note 22 - Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] |
|  | Cathay General Bancorp |  |  | Cathay Bank |
|  | December 31, 2018 |  |  | December 31, 2017 |  |  | December 31, 2018 |  |  | December 31, 2017 |
(Dollars in thousands) |  | Balance |  |  | % |  |  | Balance |  |  | % |  |  | Balance |  |  | % |  |  | Balance |  |  | % |
Common equity Tier 1 capital ( to risk-weighted assets) |  | $ | 1,736,854 |  |  |  | 12.43 |  |  | $ | 1,572,025 |  |  |  | 12.19 |  |  | $ | 1,904,820 |  |  |  | 13.66 |  |  | $ | 1,734,719 |  |  |  | 13.46 |
Common equity Tier 1 capital minimum requirement |  |  | 628,393 |  |  |  | 4.50 |  |  |  | 580,552 |  |  |  | 4.50 |  |  |  | 627,800 |  |  |  | 4.50 |  |  |  | 579,921 |  |  |  | 4.50 |
Excess |  | $ | 1,108,461 |  |  |  | 7.93 |  |  | $ | 991,473 |  |  |  | 7.69 |  |  | $ | 1,277,020 |  |  |  | 9.16 |  |  | $ | 1,154,798 |  |  |  | 8.96 |
Tier 1 capital (to risk-weighted assets) |  | $ | 1,736,854 |  |  |  | 12.43 |  |  | $ | 1,572,025 |  |  |  | 12.19 |  |  | $ | 1,904,820 |  |  |  | 13.66 |  |  | $ | 1,734,719 |  |  |  | 13.46 |
Tier 1 capital minimum requirement |  |  | 838,258 |  |  |  | 6.00 |  |  |  | 774,070 |  |  |  | 6.00 |  |  |  | 837,067 |  |  |  | 6.00 |  |  |  | 773,229 |  |  |  | 6.00 |
Excess |  | $ | 898,596 |  |  |  | 6.43 |  |  | $ | 797,955 |  |  |  | 6.19 |  |  | $ | 1,067,753 |  |  |  | 7.66 |  |  | $ | 961,490 |  |  |  | 7.46 |
Total capital (to risk-weighted assets) |  | $ | 1,976,995 |  |  |  | 14.15 |  |  | $ | 1,820,860 |  |  |  | 14.11 |  |  | $ | 2,029,462 |  |  |  | 14.55 |  |  | $ | 1,862,806 |  |  |  | 14.45 |
Total capital minimum requirement |  |  | 1,117,677 |  |  |  | 8.00 |  |  |  | 1,032,093 |  |  |  | 8.00 |  |  |  | 1,116,089 |  |  |  | 8.00 |  |  |  | 1,030,971 |  |  |  | 8.00 |
Excess |  | $ | 859,318 |  |  |  | 6.15 |  |  | $ | 788,767 |  |  |  | 6.11 |  |  | $ | 913,373 |  |  |  | 6.55 |  |  | $ | 831,835 |  |  |  | 6.45 |
Tier 1 capital (to average assets) – Leverage ratio |  | $ | 1,736,854 |  |  |  | 10.83 |  |  | $ | 1,572,025 |  |  |  | 10.35 |  |  | $ | 1,904,820 |  |  |  | 11.89 |  |  | $ | 1,734,719 |  |  |  | 11.82 |
Minimum leverage requirement |  |  | 641,755 |  |  |  | 4.00 |  |  |  | 607,349 |  |  |  | 4.00 |  |  |  | 640,807 |  |  |  | 4.00 |  |  |  | 586,959 |  |  |  | 4.00 |
Excess |  | $ | 1,095,099 |  |  |  | 6.83 |  |  | $ | 964,676 |  |  |  | 6.35 |  |  | $ | 1,264,013 |  |  |  | 7.89 |  |  | $ | 1,147,760 |  |  |  | 7.82 |
Risk-weighted assets |  | $ | 13,969,004 |  |  |  |  |  |  | $ | 12,901,161 |  |  |  |  |  |  | $ | 13,949,605 |  |  |  |  |  |  | $ | 12,887,142 |  |  |  |  |
Total average assets (1) |  | $ | 16,042,924 |  |  |  |  |  |  | $ | 15,183,720 |  |  |  |  |  |  | $ | 16,019,658 |  |  |  |  |  |  | $ | 14,673,981 |  |  |  |  |

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