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Business Combinations and Asset Acquisitions - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Oct. 01, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Bank of Commerce        
Business Acquisition [Line Items]        
Business Combination, Purchase Price Allocation, Goodwill Amount $ 57,330      
Business Combination, Purchase Price Allocation, Amortizable Intangible Assets 15,932      
Business Combination, net loans acquired 1,084,984      
Acquired PCD loans $ 40,278      
Business Combination, Acquisition Related Costs   $ 10,370 $ 0 $ 0
Umpqua        
Business Acquisition [Line Items]        
Business Combination, Acquisition Related Costs   $ 4,100