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Regulatory Requirements and Matters (Regulatory Capital Information (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
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 | 4.50% |
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 | $ 6,124,827 | $ 5,510,640
Tier I capital (to risk-weighted assets), Amount | 5,559,357 | 4,882,555
Tier 1 Common Equity capital (to risk-weighted assets), Amount | 5,559,357 | 4,882,555
Tier 1 leverage capital (to adjusted average assets), Amount | 5,559,357 | 4,882,555
Risk-weighted assets | 43,585,105 | 38,406,071
Adjusted quarterly average total assets | $ 62,387,003 | $ 52,540,964
Total capital (to risk-weighted assets), Ratio (as a percent) | 0.141 | 0.143
Tier I capital (to risk-weighted assets), Ratio (as a percent) | 0.128 | 0.127
Tier 1 Common Equity capital (to risk-weighted assets), Ratio (as a percent) | 0.128 | 0.127
Tier 1 leverage capital (to adjusted average assets), Ratio (as a percent) | 0.090 | 0.094
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 | 4.50% |
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) | 6.50% |
East West Bank |  |
Actual |  |
Total capital (to risk-weighted assets), Amount | $ 5,766,734 | $ 5,143,246
Tier I capital (to risk-weighted assets), Amount | 5,349,264 | 4,662,426
Tier 1 Common Equity capital (to risk-weighted assets), Amount | 5,349,264 | 4,662,426
Tier 1 leverage capital (to adjusted average assets), Amount | 5,349,264 | 4,662,426
Risk-weighted assets | 43,572,086 | 38,481,275
Adjusted quarterly average total assets | $ 62,366,514 | $ 52,594,313
Total capital (to risk-weighted assets), Ratio (as a percent) | 0.132 | 0.134
Tier I capital (to risk-weighted assets), Ratio (as a percent) | 0.123 | 0.121
Tier 1 Common Equity capital (to risk-weighted assets), Ratio (as a percent) | 0.123 | 0.121
Tier 1 leverage capital (to adjusted average assets), Ratio (as a percent) | 0.086 | 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 | 4.50% |
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) | 6.50% |
Tier 1 leverage capital (to adjusted average assets), Ratio (as a percent) | 0.050 |

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