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Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, net $ 125,271 $ 113,436
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2021   18,492
2022   16,213
2023   14,336
2024   12,557
2025   11,442
Thereafter   40,396
Goodwill [Roll Forward]    
Goodwill, Beginning Balance 1,049,263  
Adjustment [1] (1,172)  
Goodwill, Ending Balance 1,048,091  
Commercial [Member]    
Goodwill [Roll Forward]    
Goodwill, Beginning Balance 313,270  
Adjustment [1] 600,661  
Goodwill, Ending Balance 913,931  
Consumer [Member]    
Goodwill [Roll Forward]    
Goodwill, Beginning Balance 43,458  
Adjustment [1] 0  
Goodwill, Ending Balance 43,458  
Wealth Management [Member]    
Goodwill [Roll Forward]    
Goodwill, Beginning Balance 90,702  
Adjustment [1] 0  
Goodwill, Ending Balance 90,702  
Funds Management and Other [Member]    
Goodwill [Roll Forward]    
Goodwill, Beginning Balance 601,833  
Adjustment [1] (601,833)  
Goodwill, Ending Balance 0  
Core deposits premiums [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross 103,200 103,200
Accumulated amortization 19,364 32,256
Finite-lived intangible assets, net 83,836 70,944
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2021   11,893
2022   10,981
2023   10,145
2024   9,379
2025   8,675
Thereafter   19,871
Other identifiable intangible assets [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross 74,372 82,731
Accumulated amortization 32,937 40,239
Finite-lived intangible assets, net $ 41,435 42,492
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2021   6,599
2022   5,232
2023   4,191
2024   3,178
2025   2,767
Thereafter   $ 20,525
[1] Goodwill related to the CoBiz acquisition was not yet allocated to the operating segments as of December 31, 2018 and was included in Funds Management and Other in 2018 then allocated during 2019.