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Note 21 - Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] |
|  | Actual |  |  | Minimum Capital Required - Basel III |  |  | Required to be Considered Well Capitalized |
|  | Capital Amount |  |  | Ratio |  |  | Capital Amount |  |  | Ratio |  |  | Capital Amount |  |  | Ratio |
December 31, 2020 |  | (Dollars in thousands) |
Common Equity Tier 1 to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cathay General Bancorp |  | $ | 2,016,448 |  |  |  | 13.53 |  |  | $ | 1,042,967 |  |  |  | 7.00 |  |  | $ | 968,470 |  |  |  | 6.50 |
Cathay Bank |  |  | 2,059,056 |  |  |  | 13.83 |  |  |  | 1,041,911 |  |  |  | 7.00 |  |  |  | 967,489 |  |  |  | 6.50 |
Tier 1 Capital to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cathay General Bancorp |  |  | 2,016,448 |  |  |  | 13.53 |  |  |  | 1,266,460 |  |  |  | 8.50 |  |  |  | 1,191,963 |  |  |  | 8.00 |
Cathay Bank |  |  | 2,059,056 |  |  |  | 13.83 |  |  |  | 1,265,178 |  |  |  | 8.50 |  |  |  | 1,190,755 |  |  |  | 8.00 |
Total Capital to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cathay General Bancorp |  |  | 2,304,366 |  |  |  | 15.47 |  |  |  | 1,564,451 |  |  |  | 10.50 |  |  |  | 1,489,953 |  |  |  | 10.00 |
Cathay Bank |  |  | 2,231,474 |  |  |  | 14.99 |  |  |  | 1,562,866 |  |  |  | 10.50 |  |  |  | 1,488,444 |  |  |  | 10.00 |
Leverage Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cathay General Bancorp |  |  | 2,016,448 |  |  |  | 10.94 |  |  |  | 737,382 |  |  |  | 4.00 |  |  |  | 921,727 |  |  |  | 5.00 |
Cathay Bank |  |  | 2,059,056 |  |  |  | 11.19 |  |  |  | 736,317 |  |  |  | 4.00 |  |  |  | 920,396 |  |  |  | 5.00 |
|  | Actual |  |  | Minimum Capital Required - Basel III |  |  | Required to be Considered Well Capitalized |
|  | Capital Amount |  |  | Ratio |  |  | Capital Amount |  |  | Ratio |  |  | Capital Amount |  |  | Ratio |
December 31, 2019 |  | (Dollars in thousands) |
Common Equity Tier 1 to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cathay General Bancorp |  | $ | 1,892,321 |  |  |  | 12.51 |  |  | $ | 1,059,259 |  |  |  | 7.00 |  |  | $ | 983,597 |  |  |  | 6.50 |
Cathay Bank |  |  | 1,959,832 |  |  |  | 12.97 |  |  |  | 1,057,880 |  |  |  | 7.00 |  |  |  | 982,318 |  |  |  | 6.50 |
Tier 1 Capital to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cathay General Bancorp |  |  | 1,892,321 |  |  |  | 12.51 |  |  |  | 1,286,243 |  |  |  | 8.50 |  |  |  | 1,210,581 |  |  |  | 8.00 |
Cathay Bank |  |  | 1,959,832 |  |  |  | 12.97 |  |  |  | 1,284,569 |  |  |  | 8.50 |  |  |  | 1,209,006 |  |  |  | 8.00 |
Total Capital to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cathay General Bancorp |  |  | 2,134,900 |  |  |  | 14.11 |  |  |  | 1,588,888 |  |  |  | 10.50 |  |  |  | 1,513,227 |  |  |  | 10.00 |
Cathay Bank |  |  | 2,086,911 |  |  |  | 13.81 |  |  |  | 1,586,821 |  |  |  | 10.50 |  |  |  | 1,511,258 |  |  |  | 10.00 |
Leverage Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cathay General Bancorp |  |  | 1,892,321 |  |  |  | 10.83 |  |  |  | 699,173 |  |  |  | 4.00 |  |  |  | 873,966 |  |  |  | 5.00 |
Cathay Bank |  |  | 1,959,832 |  |  |  | 11.23 |  |  |  | 697,976 |  |  |  | 4.00 |  |  |  | 872,470 |  |  |  | 5.00 |

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