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