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Goodwill, Intangible Assets, and Servicing Assets - Intangible Assets (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]          
Goodwill impairment $ 0   $ 0    
Goodwill 464,450,000   464,450,000   $ 464,450,000
Core Deposits          
Finite-Lived Intangible Assets [Line Items]          
Amortization expense related to core deposit intangible assets 510,000 $ 532,000 1,000,000.0 $ 1,100,000  
Gross Amount 20,901,000   20,901,000   20,901,000
Accumulated Amortization (12,212,000)   (12,212,000)   (11,193,000)
Carrying Amount 8,689,000   $ 8,689,000   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   2,763,000
Accumulated Amortization (2,413,000)   (2,413,000)   (2,322,000)
Carrying Amount 350,000   $ 350,000   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   18,138,000
Accumulated Amortization (9,799,000)   (9,799,000)   (8,871,000)
Carrying Amount $ 8,339,000   $ 8,339,000   $ 9,267,000
Maximum | Core Deposits          
Finite-Lived Intangible Assets [Line Items]          
Amortization Period     10 years