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Federal Home Loan Bank Advances and Long-Term Debt (Junior Subordinated Debt) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
trust
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]    
Number of wholly owned subsidiaries that are statutory business trusts | trust 6  
Junior subordinated debt    
Debt Instrument [Line Items]    
Number of statutory business trusts formed for the purpose of issuing junior subordinated debt to third party investors | trust 6  
Aggregate Principal Amount of Trust Securities $ 4,641 $ 4,641
Aggregate Principal Amount of the Junior Subordinated Debts $ 148,000 148,000
East West Capital Trust V | Junior subordinated debt    
Debt Instrument [Line Items]    
Stated Interest Rate, base 3-month Libor +  
Stated Interest Rate, basis spread (as a percent) 1.80%  
Current Rate 4.45%  
Aggregate Principal Amount of Trust Securities $ 464 464
Aggregate Principal Amount of the Junior Subordinated Debts $ 15,000 15,000
East West Capital Trust VI | Junior subordinated debt    
Debt Instrument [Line Items]    
Stated Interest Rate, base 3-month Libor +  
Stated Interest Rate, basis spread (as a percent) 1.50%  
Current Rate 4.29%  
Aggregate Principal Amount of Trust Securities $ 619 619
Aggregate Principal Amount of the Junior Subordinated Debts $ 20,000 20,000
East West Capital Trust VII | Junior subordinated debt    
Debt Instrument [Line Items]    
Stated Interest Rate, base 3-month Libor +  
Stated Interest Rate, basis spread (as a percent) 1.35%  
Current Rate 4.14%  
Aggregate Principal Amount of Trust Securities $ 928 928
Aggregate Principal Amount of the Junior Subordinated Debts $ 30,000 30,000
East West Capital Trust VIII | Junior subordinated debt    
Debt Instrument [Line Items]    
Stated Interest Rate, base 3-month Libor +  
Stated Interest Rate, basis spread (as a percent) 1.40%  
Current Rate 4.14%  
Aggregate Principal Amount of Trust Securities $ 619 619
Aggregate Principal Amount of the Junior Subordinated Debts $ 18,000 18,000
East West Capital Trust IX | Junior subordinated debt    
Debt Instrument [Line Items]    
Stated Interest Rate, base 3-month Libor +  
Stated Interest Rate, basis spread (as a percent) 1.90%  
Current Rate 4.69%  
Aggregate Principal Amount of Trust Securities $ 928 928
Aggregate Principal Amount of the Junior Subordinated Debts $ 30,000 30,000
MCBI Statutory Trust I | Junior subordinated debt    
Debt Instrument [Line Items]    
Stated Interest Rate, base 3-month Libor +  
Stated Interest Rate, basis spread (as a percent) 1.55%  
Current Rate 4.34%  
Aggregate Principal Amount of Trust Securities $ 1,083 1,083
Aggregate Principal Amount of the Junior Subordinated Debts $ 35,000 $ 35,000