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Note 21 - Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] |
|  | Cathay General Bancorp |  |  | Cathay Bank |
|  | December 31, 2017 |  |  | December 31, 2016 |  |  | December 31, 2017 |  |  | December 31, 2016 |
(Dollars in thousands) |  | Balance |  |  | % |  |  | Balance |  |  | % |  |  | Balance |  |  | % |  |  | Balance |  |  | % |
Common equity Tier 1 capital ( to risk-weighted assets) |  | $ | 1,572,025 |  |  |  | 12.19 |  |  | $ | 1,459,351 |  |  |  | 12.84 |  |  | $ | 1,734,719 |  |  |  | 13.46 |  |  | $ | 1,515,096 |  |  |  | 13.35 |
Common equity Tier 1 capital minimum requirement |  |  | 580,552 |  |  |  | 4.50 |  |  |  | 511,590 |  |  |  | 4.50 |  |  |  | 579,921 |  |  |  | 4.50 |  |  |  | 510,582 |  |  |  | 4.50 |
Excess |  | $ | 991,473 |  |  |  | 7.69 |  |  | $ | 947,761 |  |  |  | 8.34 |  |  | $ | 1,154,798 |  |  |  | 8.96 |  |  | $ | 1,004,514 |  |  |  | 8.85 |
Tier 1 capital (to risk-weighted assets) |  | $ | 1,572,025 |  |  |  | 12.19 |  |  | $ | 1,574,806 |  |  |  | 13.85 |  |  | $ | 1,734,719 |  |  |  | 13.46 |  |  | $ | 1,515,096 |  |  |  | 13.35 |
Tier 1 capital minimum requirement |  |  | 774,070 |  |  |  | 6.00 |  |  |  | 682,120 |  |  |  | 6.00 |  |  |  | 773,229 |  |  |  | 6.00 |  |  |  | 680,776 |  |  |  | 6.00 |
Excess |  | $ | 797,955 |  |  |  | 6.19 |  |  | $ | 892,686 |  |  |  | 7.85 |  |  | $ | 961,490 |  |  |  | 7.46 |  |  | $ | 834,320 |  |  |  | 7.35 |
Total capital (to risk-weighted assets) |  | $ | 1,820,860 |  |  |  | 14.11 |  |  | $ | 1,702,144 |  |  |  | 14.97 |  |  | $ | 1,862,806 |  |  |  | 14.45 |  |  | $ | 1,637,286 |  |  |  | 14.43 |
Total capital minimum requirement |  |  | 1,032,093 |  |  |  | 8.00 |  |  |  | 909,493 |  |  |  | 8.00 |  |  |  | 1,030,971 |  |  |  | 8.00 |  |  |  | 907,701 |  |  |  | 8.00 |
Excess |  | $ | 788,767 |  |  |  | 6.11 |  |  | $ | 792,651 |  |  |  | 6.97 |  |  | $ | 831,835 |  |  |  | 6.45 |  |  | $ | 729,585 |  |  |  | 6.43 |
Tier 1 capital (to average assets) – Leverage ratio |  | $ | 1,572,025 |  |  |  | 10.35 |  |  | $ | 1,574,806 |  |  |  | 11.57 |  |  | $ | 1,734,719 |  |  |  | 11.82 |  |  | $ | 1,515,096 |  |  |  | 11.16 |
Minimum leverage requirement |  |  | 607,349 |  |  |  | 4.00 |  |  |  | 544,614 |  |  |  | 4.00 |  |  |  | 586,959 |  |  |  | 4.00 |  |  |  | 543,059 |  |  |  | 4.00 |
Excess |  | $ | 964,676 |  |  |  | 6.35 |  |  | $ | 1,030,192 |  |  |  | 7.57 |  |  | $ | 1,147,760 |  |  |  | 7.82 |  |  | $ | 972,037 |  |  |  | 7.16 |
Risk-weighted assets |  | $ | 12,901,161 |  |  |  |  |  |  | $ | 11,368,663 |  |  |  |  |  |  | $ | 12,887,142 |  |  |  |  |  |  | $ | 11,346,260 |  |  |  |  |
Total average assets (1) |  | $ | 15,183,720 |  |  |  |  |  |  | $ | 13,615,348 |  |  |  |  |  |  | $ | 14,673,981 |  |  |  |  |  |  | $ | 13,576,477 |  |  |  |  |

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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1G -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958577-112826 + Details
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