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Goodwill and Other Intangibles Assets - Intangible assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 25,605 $ 25,605
Accumulated Amortization (11,544) (9,082)
Estimated future amortization expense for identifiable intangible assets:    
2019 2,200  
2020 2,100  
2021 2,000  
2022 1,900  
2023 1,800  
Core deposits    
Finite-Lived Intangible Assets [Line Items]    
Amortization expense $ 2,500 2,700
Center Financial Corporation acquisition | Core deposits    
Finite-Lived Intangible Assets [Line Items]    
Amortization period 7 years  
Gross Carrying Amount $ 4,100 4,100
Accumulated Amortization $ (4,100) (3,966)
Pacific International Bancorp, Inc. acquisition | Core deposits    
Finite-Lived Intangible Assets [Line Items]    
Amortization period 7 years  
Gross Carrying Amount $ 604 604
Accumulated Amortization $ (579) (534)
Foster Bankshares Inc acquisition | Core deposits    
Finite-Lived Intangible Assets [Line Items]    
Amortization period 10 years  
Gross Carrying Amount $ 2,763 2,763
Accumulated Amortization $ (1,893) (1,636)
Wilshire Bancorp, Inc | Core deposits    
Finite-Lived Intangible Assets [Line Items]    
Amortization period 10 years  
Gross Carrying Amount $ 18,138 18,138
Accumulated Amortization $ (4,972) $ (2,946)