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Regulatory Requirements and Matters - Regulatory Capital Information (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Minimum Capital Ratios |  |
Total capital ratio required for capital adequacy to risk weighted assets | 0.080 |
Tier 1 risk based 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 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 | $ 7,003,299 | $ 6,124,827
Tier I capital (to risk-weighted assets), Amount | 6,347,108 | 5,559,357
Tier 1 Common Equity capital (to risk-weighted assets), Amount | 6,347,108 | 5,559,357
Tier 1 leverage capital (to adjusted average assets), Amount | 6,347,108 | 5,559,357
Risk-weighted assets | 50,036,719 | 43,585,105
Adjusted quarterly average total assets | $ 65,221,597 | $ 62,387,003
Total capital (to risk-weighted assets), Ratio (as a percent) | 0.140 | 0.141
Tier I capital (to risk-weighted assets), Ratio (as a percent) | 0.127 | 0.128
Tier 1 Common Equity capital (to risk-weighted assets), Ratio (as a percent) | 0.127 | 0.128
Tier 1 leverage capital (to adjusted average assets), Ratio (as a percent) | 0.098 | 0.090
Minimum Capital Ratios |  |
Total capital ratio required for capital adequacy to risk weighted assets | 0.080 |
Tier 1 risk based 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 average assets), Ratio (as a percent) | 0.040 |
Fully phased-in minimum capital ratios |  |
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% |
Tier 1 Common Equity Capital (to risk-weighted assets), Ratio (as a percent) | 7.00% |
Tier 1 leverage capital (to adjusted 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 |
Tier 1 Common Equity Capital (to risk-weighted assets), Ratio (as a percent) | 0.065 |
East West Bank |  |
Actual |  |
Total capital (to risk-weighted assets), Amount | $ 6,760,612 | $ 5,766,734
Tier I capital (to risk-weighted assets), Amount | 6,252,421 | 5,349,264
Tier 1 Common Equity capital (to risk-weighted assets), Amount | 6,252,421 | 5,349,264
Tier 1 leverage capital (to adjusted average assets), Amount | 6,252,421 | 5,349,264
Risk-weighted assets | 50,024,772 | 43,572,086
Adjusted quarterly average total assets | $ 65,198,267 | $ 62,366,514
Total capital (to risk-weighted assets), Ratio (as a percent) | 0.135 | 0.132
Tier I capital (to risk-weighted assets), Ratio (as a percent) | 0.125 | 0.123
Tier 1 Common Equity capital (to risk-weighted assets), Ratio (as a percent) | 0.125 | 0.123
Tier 1 leverage capital (to adjusted average assets), Ratio (as a percent) | 0.097 | 0.086
Minimum Capital Ratios |  |
Total capital ratio required for capital adequacy to risk weighted assets | 0.080 |
Tier 1 risk based 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 average assets), Ratio (as a percent) | 0.040 |
Fully phased-in minimum capital ratios |  |
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% |
Tier 1 Common Equity Capital (to risk-weighted assets), Ratio (as a percent) | 7.00% |
Tier 1 leverage capital (to adjusted 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 |
Tier 1 Common Equity Capital (to risk-weighted assets), Ratio (as a percent) | 0.065 |
Tier 1 leverage capital (to adjusted average assets), Ratio (as a percent) | 0.050 |

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