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Intangible Assets - Intangible Assets (Details) - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]      
Goodwill $ 105,401,000   $ 105,401,000
Goodwill impairment 0 $ 0  
Gross Carrying Amount 7,466,000    
Accumulated Amortization (4,859,000)    
Core Deposits      
Finite-Lived Intangible Assets [Line Items]      
Amortization expense related to core deposit intangible qssets $ (212,000) $ (267,000)  
Center Financial Corporation | Core Deposits      
Finite-Lived Intangible Assets [Line Items]      
Amortization period 7 years    
Gross Carrying Amount $ 4,100,000    
Accumulated Amortization $ (3,365,000)    
Pacific International Bancorp, Inc. | Core Deposits      
Finite-Lived Intangible Assets [Line Items]      
Amortization period 7 years    
Gross Carrying Amount $ 603,000    
Accumulated Amortization $ (401,000)    
Foster Bankshares Inc | Core Deposits      
Finite-Lived Intangible Assets [Line Items]      
Amortization period 10 years    
Gross Carrying Amount $ 2,763,000    
Accumulated Amortization $ (1,093,000)    
Minimum | Core Deposits      
Finite-Lived Intangible Assets [Line Items]      
Amortization period 7 years    
Maximum | Core Deposits      
Finite-Lived Intangible Assets [Line Items]      
Amortization period 10 years