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Goodwill, Intangible Assets, and Servicing Assets - Intangible Assets (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Apr. 02, 2025
Finite-Lived Intangible Assets [Line Items]          
Goodwill $ 480,916,000 $ 480,916,000 $ 464,450,000    
Finite-Lived Intangible Asset, Expected Amortization, Year One 3,900,000 3,900,000      
Finite-Lived Intangible Asset, Expected Amortization, Year Two 3,100,000 3,100,000      
Goodwill impairment   0      
Finite-Lived Intangible Asset, Expected Amortization, Year Three 3,100,000 3,100,000      
Finite-Lived Intangible Asset, Expected Amortization, Year Four 3,100,000 3,100,000      
Finite-Lived Intangible Asset, Expected Amortization, Year Five 3,100,000 3,100,000      
Finite-Lived Intangible Asset, Expected Amortization, after Year Five 28,700,000 28,700,000      
Core Deposits          
Finite-Lived Intangible Assets [Line Items]          
Gross Amount 64,658,000 64,658,000      
Accumulated Amortization (19,636,000) (19,636,000) (15,807,000)    
Carrying Amount $ 45,022,000 45,022,000 2,331,000    
Amortization expense related to core deposit intangible assets   $ 3,800,000 1,600,000 $ 1,800,000  
Wilshire Bancorp | 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 (17,310,000) (17,310,000) (15,807,000)    
Carrying Amount $ 828,000 $ 828,000 2,331,000    
Territorial Bancorp Inc.          
Finite-Lived Intangible Assets [Line Items]          
Goodwill         $ 16,466,000
Territorial Bancorp Inc. | Core Deposits          
Finite-Lived Intangible Assets [Line Items]          
Amortization Period 15 years 15 years      
Gross Amount $ 46,520,000 $ 46,520,000      
Accumulated Amortization (2,326,000) (2,326,000) 0    
Carrying Amount $ 44,194,000 $ 44,194,000 $ 0   $ 46,520,000
Finite-Lived Intangible Assets, Percentage of Total Intangible Assets         4.10%
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life 15 years        
Maximum | Core Deposits          
Finite-Lived Intangible Assets [Line Items]          
Amortization Period 15 years 15 years