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Goodwill, Intangible Assets, and Servicing Assets - Intangible Assets (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]      
Goodwill $ 464,450,000 $ 464,450,000  
Finite-Lived Intangible Asset, Expected Amortization, Year One 1,500,000    
Finite-Lived Intangible Asset, Expected Amortization, Year Two 829,000    
Goodwill impairment 0    
Core Deposits      
Finite-Lived Intangible Assets [Line Items]      
Amortization expense related to core deposit intangible assets $ 1,600,000 1,800,000 $ 1,900,000
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 (15,807,000) (14,203,000)  
Carrying Amount $ 2,331,000 $ 3,935,000  
Maximum | Core Deposits      
Finite-Lived Intangible Assets [Line Items]      
Amortization Period 10 years