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Regulatory Requirements and Matters (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Capital adequacy    
Tier One Common Equity For Capital Adequacy To Risk Weighted Assets, Minimum 4.50%  
Banking Regulation, Tier One Risk-Based Capital Ratio, Capital Adequacy, Minimum 0.060  
Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum 0.080  
Banking Regulation, Tier One Leverage Capital Ratio, Capital Adequacy, Minimum 0.040  
Fully phased-in capital conservation buffer 2.50%  
East West Bank    
Capital adequacy    
Tier One Common Equity For Capital Adequacy To Risk Weighted Assets, Minimum 4.50%  
Banking Regulation, Tier One Risk-Based Capital Ratio, Capital Adequacy, Minimum 0.060  
Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum 0.080  
Banking Regulation, Tier One Leverage Capital Ratio, Capital Adequacy, Minimum 0.040  
Daily average reserve requirement $ 0 $ 0