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Goodwill, Intangible Assets, and Servicing Assets - Intangible Assets (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]      
Goodwill impairment $ 0    
Goodwill 464,450,000   $ 464,450,000
Core Deposits      
Finite-Lived Intangible Assets [Line Items]      
Amortization expense related to core deposit intangible assets 509,000 $ 531,000  
Gross Amount 20,901,000   20,901,000
Accumulated Amortization (11,703,000)   (11,193,000)
Carrying Amount $ 9,198,000   9,708,000
Foster Bankshares acquisition | Core Deposits      
Finite-Lived Intangible Assets [Line Items]      
Amortization Period 10 years    
Gross Amount $ 2,763,000   2,763,000
Accumulated Amortization (2,368,000)   (2,322,000)
Carrying Amount $ 395,000   441,000
Wilshire Bancorp acquisition | Core Deposits      
Finite-Lived Intangible Assets [Line Items]      
Amortization Period 10 years    
Gross Amount $ 18,138,000   18,138,000
Accumulated Amortization (9,335,000)   (8,871,000)
Carrying Amount $ 8,803,000   $ 9,267,000
Maximum | Core Deposits      
Finite-Lived Intangible Assets [Line Items]      
Amortization Period 10 years