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Regulatory Requirements and Matters - Regulatory Capital Information (Details)
$ in Thousands
12 Months Ended
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