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Regulatory Requirements and Matters (Regulatory Capital Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2016
Well Capitalized Requirement      
Transition capital conservation buffer, percent 1.875% 1.25% 0.625%
Company      
Actual      
Total capital (to risk-weighted assets), Amount $ 4,438,730 $ 3,838,516  
Tier I capital (to risk-weighted assets), Amount 3,966,842 3,390,070  
Tier 1 Common Equity capital (to risk-weighted assets), Amount 3,966,842 3,390,070  
Tier 1 leverage capital (to adjusted average assets), Amount 3,966,842 3,390,070  
Risk-weighted assets 32,497,296 29,669,251  
Adjusted quarterly average total assets $ 40,636,402 $ 37,307,975  
Total capital (to risk-weighted assets), Ratio (as a percent) 13.70% 12.90%  
Tier I capital (to risk-weighted assets), Ratio (as a percent) 12.20% 11.40%  
Tier 1 Common Equity capital (to risk-weighted assets), Ratio (as a percent) 12.20% 11.40%  
Tier 1 leverage capital (to adjusted average assets), Ratio (as a percent) 9.90% 9.20%  
Minimum Capital Ratios      
Total capital (to risk-weighted assets), Ratio (as a percent) 9.88% 9.25%  
Tier I capital (to risk-weighted assets), Ratio (as a percent) 7.88% 7.25%  
Tier 1 Common Equity Capital (to risk-weighted assets), Ratio (as a percent) 6.38% 5.75%  
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 $ 4,268,616 $ 3,679,261  
Tier I capital (to risk-weighted assets), Amount 3,944,728 3,378,815  
Tier 1 Common Equity capital (to risk-weighted assets), Amount 3,944,728 3,378,815  
Tier 1 leverage capital (to adjusted average assets), Amount 3,944,728 3,378,815  
Risk-weighted assets 32,477,002 29,643,711  
Adjusted quarterly average total assets $ 40,611,215 $ 37,283,273  
Total capital (to risk-weighted assets), Ratio (as a percent) 13.10% 12.40%  
Tier I capital (to risk-weighted assets), Ratio (as a percent) 12.10% 11.40%  
Tier 1 Common Equity capital (to risk-weighted assets), Ratio (as a percent) 12.10% 11.40%  
Tier 1 leverage capital (to adjusted average assets), Ratio (as a percent) 9.80% 9.20%  
Minimum Capital Ratios      
Total capital (to risk-weighted assets), Ratio (as a percent) 9.88% 9.25%  
Tier I capital (to risk-weighted assets), Ratio (as a percent) 7.88% 7.25%  
Tier 1 Common Equity Capital (to risk-weighted assets), Ratio (as a percent) 6.38% 5.75%  
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%