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Goodwill, Intangible Assets, and Servicing Assets - Intangible Assets (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]          
Goodwill $ 464,450,000   $ 464,450,000   $ 464,450,000
Goodwill impairment 0   0    
Core Deposits          
Finite-Lived Intangible Assets [Line Items]          
Amortization expense related to core deposit intangible assets 448,000 $ 486,000 896,000 $ 973,000  
Gross Amount 20,901,000   20,901,000   20,901,000
Accumulated Amortization (16,071,000)   (16,071,000)   (15,175,000)
Carrying Amount $ 4,830,000   $ 4,830,000   5,726,000
Foster Bankshares acquisition | Core Deposits          
Finite-Lived Intangible Assets [Line Items]          
Amortization Period 10 years   10 years    
Gross Amount $ 2,763,000   $ 2,763,000   2,763,000
Accumulated Amortization (2,716,000)   (2,716,000)   (2,668,000)
Carrying Amount $ 47,000   $ 47,000   95,000
Wilshire Bancorp acquisition | Core Deposits          
Finite-Lived Intangible Assets [Line Items]          
Amortization Period 10 years   10 years    
Gross Amount $ 18,138,000   $ 18,138,000   18,138,000
Accumulated Amortization (13,355,000)   (13,355,000)   (12,507,000)
Carrying Amount $ 4,783,000   $ 4,783,000   $ 5,631,000