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Regulatory Requirements and Matters (Tables) | 12 Months Ended
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Dec. 31, 2017
Banking and Thrift [Abstract] |
Schedule of regulatory capital information | The following table presents the regulatory capital information of the Company and the Bank as of December 31, 2017 and 2016:
|  | Basel III
|  | December 31, 2017 |  | December 31, 2016
($ in thousands) |  | Actual |  | Minimum Requirement |  | Well Capitalized Requirement |  | Actual |  | Minimum Requirement |  | Well Capitalized Requirement
| Amount |  | Ratio |  | Ratio |  | Ratio |  | Amount |  | Ratio |  | Ratio |  | Ratio
Total capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 3,838,516 |  |  | 12.9 | % |  | 8.0 | % |  | 10.0 | % |  | $ | 3,400,642 |  |  | 12.4 | % |  | 8.0 | % |  | 10.0 | %
East West Bank |  | $ | 3,679,261 |  |  | 12.4 | % |  | 8.0 | % |  | 10.0 | % |  | $ | 3,371,885 |  |  | 12.3 | % |  | 8.0 | % |  | 10.0 | %
Tier 1 capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 3,390,070 |  |  | 11.4 | % |  | 6.0 | % |  | 8.0 | % |  | $ | 2,976,002 |  |  | 10.9 | % |  | 6.0 | % |  | 8.0 | %
East West Bank |  | $ | 3,378,815 |  |  | 11.4 | % |  | 6.0 | % |  | 8.0 | % |  | $ | 3,095,245 |  |  | 11.3 | % |  | 6.0 | % |  | 8.0 | %
CET1 capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 3,390,070 |  |  | 11.4 | % |  | 4.5 | % |  | 6.5 | % |  | $ | 2,976,002 |  |  | 10.9 | % |  | 4.5 | % |  | 6.5 | %
East West Bank |  | $ | 3,378,815 |  |  | 11.4 | % |  | 4.5 | % |  | 6.5 | % |  | $ | 3,095,245 |  |  | 11.3 | % |  | 4.5 | % |  | 6.5 | %
Tier 1 leverage capital (to adjusted average assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 3,390,070 |  |  | 9.2 | % |  | 4.0 | % |  | 5.0 | % |  | $ | 2,976,002 |  |  | 8.7 | % |  | 4.0 | % |  | 5.0 | %
East West Bank |  | $ | 3,378,815 |  |  | 9.2 | % |  | 4.0 | % |  | 5.0 | % |  | $ | 3,095,245 |  |  | 9.1 | % |  | 4.0 | % |  | 5.0 | %
Risk-weighted assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 29,669,251 |  |  | N/A |  |  | N/A |  |  | N/A |  |  | $ | 27,357,753 |  |  | N/A |  |  | N/A |  |  | N/A |
East West Bank |  | $ | 29,643,711 |  |  | N/A |  |  | N/A |  |  | N/A |  |  | $ | 27,310,540 |  |  | N/A |  |  | N/A |  |  | N/A |
Adjusted quarterly average total assets (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 37,307,975 |  |  | N/A |  |  | N/A |  |  | N/A |  |  | $ | 34,209,827 |  |  | N/A |  |  | N/A |  |  | N/A |
East West Bank |  | $ | 37,283,273 |  |  | N/A |  |  | N/A |  |  | N/A |  |  | $ | 34,163,667 |  |  | N/A |  |  | N/A |  |  | N/A |
(1) | Reflects adjusted average total assets for the years ended December 31, 2017 and 2016.
N/A — Not applicable

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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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