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Subordinated Debentures - Summary of Trust Preferred Securities and Debentures (Details) (USD $)
Sep. 30, 2014
Dec. 31, 2013
Subordinated Borrowing [Line Items]    
Carrying Value of Subordinated Debentures Amount $ 42,117,000 $ 57,410,000
Nara Capital Trust III
    
Subordinated Borrowing [Line Items]    
Initial Rate 4.44%  
Coupon Rate at June 30, 2014 3.38%  
Nara Statutory Trust IV
    
Subordinated Borrowing [Line Items]    
Initial Rate 4.02%  
Coupon Rate at June 30, 2014 3.08%  
Nara Statutory Trust V
    
Subordinated Borrowing [Line Items]    
Initial Rate 4.12%  
Coupon Rate at June 30, 2014 3.19%  
Nara Statutory Trust VI
    
Subordinated Borrowing [Line Items]    
Initial Rate 7.00%  
Coupon Rate at June 30, 2014 1.88%  
Center Capital Trust I
    
Subordinated Borrowing [Line Items]    
Initial Rate 4.01% [1]  
Coupon Rate at June 30, 2014 3.08% [1]  
Unamortized discount 5,300,000  
Effective percentage 5.54%  
Trust Preferred Security Amount
    
Subordinated Borrowing [Line Items]    
Trust Preferred Security Amount 46,000,000  
Trust Preferred Security Amount | Nara Capital Trust III
    
Subordinated Borrowing [Line Items]    
Trust Preferred Security Amount 5,000,000  
Trust Preferred Security Amount | Nara Statutory Trust IV
    
Subordinated Borrowing [Line Items]    
Trust Preferred Security Amount 5,000,000  
Trust Preferred Security Amount | Nara Statutory Trust V
    
Subordinated Borrowing [Line Items]    
Trust Preferred Security Amount 10,000,000  
Trust Preferred Security Amount | Nara Statutory Trust VI
    
Subordinated Borrowing [Line Items]    
Trust Preferred Security Amount 8,000,000  
Trust Preferred Security Amount | Center Capital Trust I
    
Subordinated Borrowing [Line Items]    
Trust Preferred Security Amount 18,000,000 [1]  
Subordinated Debentures Amount
    
Subordinated Borrowing [Line Items]    
Carrying Value of Subordinated Debentures Amount 42,117,000  
Subordinated Debentures Amount | Nara Capital Trust III
    
Subordinated Borrowing [Line Items]    
Carrying Value of Subordinated Debentures Amount 5,155,000  
Subordinated Debentures Amount | Nara Statutory Trust IV
    
Subordinated Borrowing [Line Items]    
Carrying Value of Subordinated Debentures Amount 5,155,000  
Subordinated Debentures Amount | Nara Statutory Trust V
    
Subordinated Borrowing [Line Items]    
Carrying Value of Subordinated Debentures Amount 10,310,000  
Subordinated Debentures Amount | Nara Statutory Trust VI
    
Subordinated Borrowing [Line Items]    
Carrying Value of Subordinated Debentures Amount 8,248,000  
Subordinated Debentures Amount | Center Capital Trust I
    
Subordinated Borrowing [Line Items]    
Carrying Value of Subordinated Debentures Amount $ 13,249,000 [1]  
[1] The Center Capital Trust I trust preferred security was assumed in the merger with Center Financial Corporation. The remaining discount was $5.3 million at September 30, 2014 and the effective rate of the security, including the effect of the discount accretion, was 5.54% at September 30, 2014.