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Intangible Assets - Intangible Assets (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]          
Goodwill $ 105,401,000   $ 105,401,000   $ 105,401,000
Goodwill impairment 0 $ 0 0 $ 0  
Gross Carrying Amount 7,466,000   7,466,000    
Accumulated Amortization (5,071,000)   (5,071,000)    
Core Deposits          
Finite-Lived Intangible Assets [Line Items]          
Amortization expense related to core deposit intangible qssets 212,000 $ 267,000 $ 425,000 $ 534,000  
Center Financial Corporation | Core Deposits          
Finite-Lived Intangible Assets [Line Items]          
Amortization period     7 years    
Gross Carrying Amount 4,100,000   $ 4,100,000    
Accumulated Amortization (3,471,000)   $ (3,471,000)    
Pacific International Bancorp, Inc. | Core Deposits          
Finite-Lived Intangible Assets [Line Items]          
Amortization period     7 years    
Gross Carrying Amount 603,000   $ 603,000    
Accumulated Amortization (423,000)   $ (423,000)    
Foster Bankshares Inc | Core Deposits          
Finite-Lived Intangible Assets [Line Items]          
Amortization period     10 years    
Gross Carrying Amount 2,763,000   $ 2,763,000    
Accumulated Amortization $ (1,177,000)   $ (1,177,000)    
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