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Goodwill, Intangible Assets, and Servicing Assets - Intangible Assets (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
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 486,000 $ 509,000 1,500,000 $ 1,500,000  
Gross Amount 20,901,000   20,901,000   20,901,000
Accumulated Amortization (14,689,000)   (14,689,000)   (13,230,000)
Carrying Amount 6,212,000   $ 6,212,000   7,671,000
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 (2,627,000)   (2,627,000)   (2,504,000)
Carrying Amount 136,000   $ 136,000   259,000
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 (12,062,000)   (12,062,000)   (10,726,000)
Carrying Amount $ 6,076,000   $ 6,076,000   $ 7,412,000
Maximum | Core Deposits          
Finite-Lived Intangible Assets [Line Items]          
Amortization Period     10 years