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Regulatory Requirements and Matters (Tables) | 12 Months Ended
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Dec. 31, 2019
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, 2019 and 2018:
($ in thousands) |  | Basel III
| December 31, 2019 |  | December 31, 2018
| Actual |  | Minimum Capital Ratios (3) |  | Well Capitalized Requirement |  | Actual |  | Minimum Capital Ratios (3) |  | Well Capitalized Requirement
| Amount |  | Ratio |  | Ratio |  | Ratio |  | Amount |  | Ratio |  | Ratio |  | Ratio
Total capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 5,064,037 |  |  | 14.4 | % |  | 10.50 | % |  | 10.0 | % |  | $ | 4,438,730 |  |  | 13.7 | % |  | 9.88 | % |  | 10.0 | %
East West Bank |  | $ | 4,886,237 |  |  | 13.9 | % |  | 10.50 | % |  | 10.0 | % |  | $ | 4,268,616 |  |  | 13.1 | % |  | 9.88 | % |  | 10.0 | %
Tier 1 capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 4,546,592 |  |  | 12.9 | % |  | 8.50 | % |  | 8.0 | % |  | $ | 3,966,842 |  |  | 12.2 | % |  | 7.88 | % |  | 8.0 | %
East West Bank |  | $ | 4,516,792 |  |  | 12.9 | % |  | 8.50 | % |  | 8.0 | % |  | $ | 3,944,728 |  |  | 12.1 | % |  | 7.88 | % |  | 8.0 | %
CET1 capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 4,546,592 |  |  | 12.9 | % |  | 7.00 | % |  | 6.5 | % |  | $ | 3,966,842 |  |  | 12.2 | % |  | 6.38 | % |  | 6.5 | %
East West Bank |  | $ | 4,516,792 |  |  | 12.9 | % |  | 7.00 | % |  | 6.5 | % |  | $ | 3,944,728 |  |  | 12.1 | % |  | 6.38 | % |  | 6.5 | %
Tier 1 leverage capital (to adjusted average assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company (1) |  | $ | 4,546,592 |  |  | 10.3 | % |  | 4.0 | % |  | N/A |  |  | $ | 3,966,842 |  |  | 9.9 | % |  | 4.0 | % |  | N/A |
East West Bank |  | $ | 4,516,792 |  |  | 10.3 | % |  | 4.0 | % |  | 5.0 | % |  | $ | 3,944,728 |  |  | 9.8 | % |  | 4.0 | % |  | 5.0 | %
Risk-weighted assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 35,136,427 |  |  | N/A |  |  | N/A |  |  | N/A |  |  | $ | 32,497,296 |  |  | N/A |  |  | N/A |  |  | N/A |
East West Bank |  | $ | 35,127,920 |  |  | N/A |  |  | N/A |  |  | N/A |  |  | $ | 32,477,002 |  |  | N/A |  |  | N/A |  |  | N/A |
Adjusted quarterly average total assets (2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 44,449,802 |  |  | N/A |  |  | N/A |  |  | N/A |  |  | $ | 40,636,402 |  |  | N/A |  |  | N/A |  |  | N/A |
East West Bank |  | $ | 44,419,308 |  |  | N/A |  |  | N/A |  |  | N/A |  |  | $ | 40,611,215 |  |  | N/A |  |  | N/A |  |  | N/A |
(1) | The Tier 1 leverage capital well-capitalized requirement applies to the Bank only since there is no Tier 1 leverage ratio component in the definition of a well-capitalized bank holding company.
(2) | Reflects adjusted average total assets for the years ended December 31, 2019 and 2018.
(3) | The CET1, Tier 1, and total capital minimum ratios include a fully phased-in capital conservation buffer of 2.5% and a transition capital conservation buffer of 1.875% for the years ended December 31, 2019 and 2018, respectively.
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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1G -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958577-112826 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117337116&loc=d3e65071-112826 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826 + Details
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