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Subordinated Debentures - Summary of Trust Preferred Securities and Debentures (Details) - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Subordinated Borrowing [Line Items]    
Carrying Value of Subordinated Debentures Amount $ 42,371,000 $ 42,327,000
Nara Capital Trust III    
Subordinated Borrowing [Line Items]    
Initial Rate 3.78%  
Nara Statutory Trust IV    
Subordinated Borrowing [Line Items]    
Initial Rate 3.47%  
Nara Statutory Trust V    
Subordinated Borrowing [Line Items]    
Initial Rate 3.59%  
Nara Statutory Trust VI    
Subordinated Borrowing [Line Items]    
Initial Rate 2.28%  
Center Capital Trust I    
Subordinated Borrowing [Line Items]    
Initial Rate [1] 3.47%  
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 [1] 18,000,000  
Subordinated Debentures Amount    
Subordinated Borrowing [Line Items]    
Carrying Value of Subordinated Debentures Amount 42,371,000  
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 [1] $ 13,503,000  
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