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Regulatory Requirements and Matters (Regulatory Capital Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Well Capitalized Requirement    
Fully phased-in capital conservation buffer 2.50%  
Transition capital conservation buffer, percent   1.875%
Company    
Actual    
Total capital (to risk-weighted assets), Amount $ 5,064,037 $ 4,438,730
Tier I capital (to risk-weighted assets), Amount 4,546,592 3,966,842
Tier 1 Common Equity capital (to risk-weighted assets), Amount 4,546,592 3,966,842
Tier 1 leverage capital (to adjusted average assets), Amount 4,546,592 3,966,842
Risk-weighted assets 35,136,427 32,497,296
Adjusted quarterly average total assets $ 44,449,802 $ 40,636,402
Total capital (to risk-weighted assets), Ratio (as a percent) 14.40% 13.70%
Tier I capital (to risk-weighted assets), Ratio (as a percent) 12.90% 12.20%
Tier 1 Common Equity capital (to risk-weighted assets), Ratio (as a percent) 12.90% 12.20%
Tier 1 leverage capital (to adjusted average assets), Ratio (as a percent) 10.30% 9.90%
Minimum Capital Ratios    
Total capital (to risk-weighted assets), Ratio (as a percent) 10.50% 9.88%
Tier I capital (to risk-weighted assets), Ratio (as a percent) 8.50% 7.88%
Tier 1 Common Equity Capital (to risk-weighted assets), Ratio (as a percent) 7.00% 6.38%
Tier 1 leverage capital (to adjusted average assets), Ratio (as a percent) 4.00% 4.00%
Well Capitalized Requirement    
Total capital (to risk-weighted assets), Ratio (as a percent) 10.00% 10.00%
Tier I capital (to risk-weighted assets), Ratio (as a percent) 8.00% 8.00%
Tier 1 Common Equity capital (to risk-weighted assets), Ratio (as a percent) 6.50% 6.50%
East West Bank    
Actual    
Total capital (to risk-weighted assets), Amount $ 4,886,237 $ 4,268,616
Tier I capital (to risk-weighted assets), Amount 4,516,792 3,944,728
Tier 1 Common Equity capital (to risk-weighted assets), Amount 4,516,792 3,944,728
Tier 1 leverage capital (to adjusted average assets), Amount 4,516,792 3,944,728
Risk-weighted assets 35,127,920 32,477,002
Adjusted quarterly average total assets $ 44,419,308 $ 40,611,215
Total capital (to risk-weighted assets), Ratio (as a percent) 13.90% 13.10%
Tier I capital (to risk-weighted assets), Ratio (as a percent) 12.90% 12.10%
Tier 1 Common Equity capital (to risk-weighted assets), Ratio (as a percent) 12.90% 12.10%
Tier 1 leverage capital (to adjusted average assets), Ratio (as a percent) 10.30% 9.80%
Minimum Capital Ratios    
Total capital (to risk-weighted assets), Ratio (as a percent) 10.50% 9.88%
Tier I capital (to risk-weighted assets), Ratio (as a percent) 8.50% 7.88%
Tier 1 Common Equity Capital (to risk-weighted assets), Ratio (as a percent) 7.00% 6.38%
Tier 1 leverage capital (to adjusted average assets), Ratio (as a percent) 4.00% 4.00%
Well Capitalized Requirement    
Total capital (to risk-weighted assets), Ratio (as a percent) 10.00% 10.00%
Tier I capital (to risk-weighted assets), Ratio (as a percent) 8.00% 8.00%
Tier 1 Common Equity capital (to risk-weighted assets), Ratio (as a percent) 6.50% 6.50%
Tier 1 leverage capital (to adjusted average assets), Ratio (as a percent) 5.00% 5.00%