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Regulatory Requirements and Matters (Regulatory Capital Information (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Minimum Capital Ratios    
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% 2.50%
Company    
Actual    
Total capital (to risk-weighted assets), Amount $ 5,510,640 $ 5,064,037
Tier I capital (to risk-weighted assets), Amount 4,882,555 4,546,592
Tier 1 Common Equity capital (to risk-weighted assets), Amount 4,882,555 4,546,592
Tier 1 leverage capital (to adjusted average assets), Amount 4,882,555 4,546,592
Risk-weighted assets 38,406,071 35,136,427
Adjusted quarterly average total assets $ 52,540,964 $ 44,449,802
Total capital (to risk-weighted assets), Ratio (as a percent) 0.143 0.144
Tier I capital (to risk-weighted assets), Ratio (as a percent) 0.127 0.129
Tier 1 Common Equity capital (to risk-weighted assets), Ratio (as a percent) 0.127 0.129
Tier 1 leverage capital (to adjusted average assets), Ratio (as a percent) 0.094 0.103
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%  
Company | Minimum    
Minimum Capital Ratios    
Total capital (to risk-weighted assets), Ratio (as a percent) 8.00%  
Tier I capital (to risk-weighted assets), Ratio (as a percent) 6.00%  
Tier 1 Common Equity Capital (to risk-weighted assets), Ratio (as a percent) 4.50%  
Tier 1 leverage capital (to adjusted average assets), Ratio (as a percent) 0.040  
Company | Maximum    
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) 0.040  
East West Bank    
Actual    
Total capital (to risk-weighted assets), Amount $ 5,143,246 $ 4,886,237
Tier I capital (to risk-weighted assets), Amount 4,662,426 4,516,792
Tier 1 Common Equity capital (to risk-weighted assets), Amount 4,662,426 4,516,792
Tier 1 leverage capital (to adjusted average assets), Amount 4,662,426 4,516,792
Risk-weighted assets 38,481,275 35,127,920
Adjusted quarterly average total assets $ 52,594,313 $ 44,419,308
Total capital (to risk-weighted assets), Ratio (as a percent) 0.134 0.139
Tier I capital (to risk-weighted assets), Ratio (as a percent) 0.121 0.129
Tier 1 Common Equity capital (to risk-weighted assets), Ratio (as a percent) 0.121 0.129
Tier 1 leverage capital (to adjusted average assets), Ratio (as a percent) 0.090 0.103
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  
East West Bank | Minimum    
Minimum Capital Ratios    
Total capital (to risk-weighted assets), Ratio (as a percent) 8.00%  
Tier I capital (to risk-weighted assets), Ratio (as a percent) 6.00%  
Tier 1 Common Equity Capital (to risk-weighted assets), Ratio (as a percent) 4.50%  
Tier 1 leverage capital (to adjusted average assets), Ratio (as a percent) 0.040  
East West Bank | Maximum    
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) 0.040