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Regulatory Requirements and Matters - Regulatory Capital Information (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
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 $ 7,919,407 $ 7,003,299
Tier I capital (to risk-weighted assets), Amount 7,140,778 6,347,108
Tier 1 Common Equity capital (to risk-weighted assets), Amount 7,140,778 6,347,108
Tier 1 leverage capital (to adjusted average assets), Amount 7,140,778 6,347,108
Risk-weighted assets 53,663,392 50,036,719
Adjusted quarterly average total assets $ 70,406,008 $ 65,221,597
Total capital (to risk-weighted assets), Ratio (as a percent) 0.148 0.140
Tier I capital (to risk-weighted assets), Ratio (as a percent) 0.133 0.127
Tier 1 Common Equity capital (to risk-weighted assets), Ratio (as a percent) 0.133 0.127
Tier 1 leverage capital (to adjusted average assets), Ratio (as a percent) 0.102 0.098
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  
East West Bank    
Actual    
Total capital (to risk-weighted assets), Amount $ 7,363,575 $ 6,760,612
Tier I capital (to risk-weighted assets), Amount 6,732,946 6,252,421
Tier 1 Common Equity capital (to risk-weighted assets), Amount 6,732,946 6,252,421
Tier 1 leverage capital (to adjusted average assets), Amount 6,732,946 6,252,421
Risk-weighted assets 53,539,980 50,024,772
Adjusted quarterly average total assets $ 70,270,449 $ 65,198,267
Total capital (to risk-weighted assets), Ratio (as a percent) 0.138 0.135
Tier I capital (to risk-weighted assets), Ratio (as a percent) 0.126 0.125
Tier 1 Common Equity capital (to risk-weighted assets), Ratio (as a percent) 0.126 0.125
Tier 1 leverage capital (to adjusted average assets), Ratio (as a percent) 0.096 0.097
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