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Business Combinations and Asset Acquisitions - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Oct. 01, 2021
Mar. 31, 2022
Mar. 31, 2021
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   $ 2,587 $ 0
Umpqua      
Business Acquisition [Line Items]      
Business Combination, Acquisition Related Costs   $ 4,500