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Regulatory Requirements and Matters - Regulatory Capital Information (Details) $ in Thousands | Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($)
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Minimum Regulatory Requirements |  |
Total capital ratio required for capital adequacy to risk weighted assets | 0.080 |
Tier 1 capital ratio required for capital adequacy to risk weighted assets | 0.060 |
Common equity tier 1 capital adequacy to risk weighted assets | 0.045 |
Tier 1 leverage capital (to adjusted quarterly average assets), Ratio (as a percent) | 0.040 |
Well-Capitalized Requirement |  |
Fully phased-in capital conservation buffer | 2.50% |
Company |  |
Actual |  |
Total capital (to risk-weighted assets), Amount | $ 9,480,208 | $ 8,561,797
Tier I capital (to risk-weighted assets), Amount | 8,721,523 | 7,839,816
CET1 capital (to risk-weighted assets), Amount | 8,721,523 | 7,839,816
Tier 1 leverage capital (to adjusted quarterly average assets), Amount | $ 8,721,523 | $ 7,839,816
Total capital (to risk-weighted assets), Ratio (as a percent) | 0.164 | 0.156
Tier I capital (to risk-weighted assets), Ratio (as a percent) | 0.151 | 0.143
CET1 capital (to risk-weighted assets), Ratio (as a percent) | 0.151 | 0.143
Tier 1 leverage capital (to adjusted quarterly average assets), Ratio (as a percent) | 0.109 | 0.104
Minimum Regulatory Requirements |  |
Total capital ratio required for capital adequacy to risk weighted assets | 0.080 |
Tier 1 capital ratio required for capital adequacy to risk weighted assets | 0.060 |
Common equity tier 1 capital adequacy to risk weighted assets | 0.045 |
Tier 1 leverage capital (to adjusted quarterly average assets), Ratio (as a percent) | 0.040 |
Minimum Regulatory Requirements including Capital Conservation Buffer |  |
Total capital (to risk-weighted assets), Ratio (as a percent) | 10.50% |
Tier I capital (to risk-weighted assets), Ratio (as a percent) | 8.50% |
CET1 capital (to risk-weighted assets), Ratio (as a percent) | 7.00% |
Tier 1 leverage capital (to adjusted quarterly average assets), Ratio (as a percent) | 4.00% |
Well-Capitalized Requirement |  |
Total capital (to risk-weighted assets), Ratio (as a percent) | 0.100 |
Tier I capital (to risk-weighted assets), Ratio (as a percent) | 0.060 |
East West Bank |  |
Actual |  |
Total capital (to risk-weighted assets), Amount | $ 8,694,701 | $ 8,053,389
Tier I capital (to risk-weighted assets), Amount | 7,973,536 | 7,367,996
CET1 capital (to risk-weighted assets), Amount | 7,973,536 | 7,367,996
Tier 1 leverage capital (to adjusted quarterly average assets), Amount | $ 7,973,536 | $ 7,367,996
Total capital (to risk-weighted assets), Ratio (as a percent) | 0.151 | 0.147
Tier I capital (to risk-weighted assets), Ratio (as a percent) | 0.139 | 0.134
CET1 capital (to risk-weighted assets), Ratio (as a percent) | 0.139 | 0.134
Tier 1 leverage capital (to adjusted quarterly average assets), Ratio (as a percent) | 0.100 | 0.098
Minimum Regulatory Requirements |  |
Total capital ratio required for capital adequacy to risk weighted assets | 0.080 |
Tier 1 capital ratio required for capital adequacy to risk weighted assets | 0.060 |
Common equity tier 1 capital adequacy to risk weighted assets | 0.045 |
Tier 1 leverage capital (to adjusted quarterly average assets), Ratio (as a percent) | 0.040 |
Minimum Regulatory Requirements including Capital Conservation Buffer |  |
Total capital (to risk-weighted assets), Ratio (as a percent) | 10.50% |
Tier I capital (to risk-weighted assets), Ratio (as a percent) | 8.50% |
CET1 capital (to risk-weighted assets), Ratio (as a percent) | 7.00% |
Tier 1 leverage capital (to adjusted quarterly average assets), Ratio (as a percent) | 4.00% |
Well-Capitalized Requirement |  |
Total capital (to risk-weighted assets), Ratio (as a percent) | 0.100 |
Tier I capital (to risk-weighted assets), Ratio (as a percent) | 0.080 |
CET1 capital (to risk-weighted assets), Ratio (as a percent) | 0.065 |
Tier 1 leverage capital (to adjusted quarterly average assets), Ratio (as a percent) | 0.050 |

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