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Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, net $ 134,849 $ 28,658
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2019 20,481  
2020 19,196  
2021 17,499  
2022 15,219  
2023 13,344  
Thereafter 49,110  
Goodwill [Roll Forward]    
Goodwill, Beginning Balance 447,430 448,899
Goodwill recognized during period 601,833 [1] 4,301
Goodwill, decrease due to sale of consolidated merchant banking investments   (5,244)
Adjustment [2]   (526)
Goodwill, Ending Balance 1,049,263 447,430
Commercial [Member]    
Goodwill [Roll Forward]    
Goodwill, Beginning Balance 313,270 272,196
Goodwill recognized during period 0 [1] 4,301
Goodwill, decrease due to sale of consolidated merchant banking investments   (5,219)
Adjustment [2]   41,992
Goodwill, Ending Balance 313,270 313,270
Consumer [Member]    
Goodwill [Roll Forward]    
Goodwill, Beginning Balance 43,458 39,023
Goodwill recognized during period 0 [1] 0
Goodwill, decrease due to sale of consolidated merchant banking investments   0
Adjustment [2]   4,435
Goodwill, Ending Balance 43,458 43,458
Wealth Management [Member]    
Goodwill [Roll Forward]    
Goodwill, Beginning Balance 90,702 71,520
Goodwill recognized during period 0 [1] 0
Goodwill, decrease due to sale of consolidated merchant banking investments   (25)
Adjustment [2]   19,207
Goodwill, Ending Balance 90,702 90,702
Funds Management and Other [Member]    
Goodwill [Roll Forward]    
Goodwill, Beginning Balance 0 66,160
Goodwill recognized during period 601,833 [1] 0
Goodwill, decrease due to sale of consolidated merchant banking investments   0
Adjustment [2]   (66,160)
Goodwill, Ending Balance 601,833 0
Core deposits premiums [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross 103,200 6,510
Accumulated amortization 5,032 808
Finite-lived intangible assets, net 98,168 5,702
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2019 14,332  
2020 12,892  
2021 11,893  
2022 10,981  
2023 10,145  
Thereafter 37,925  
Other identifiable intangible assets [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross 63,497 44,468
Accumulated amortization 26,816 21,512
Finite-lived intangible assets, net 36,681 $ 22,956
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2019 6,149  
2020 6,304  
2021 5,606  
2022 4,238  
2023 3,199  
Thereafter $ 11,185  
[1] Goodwill related to the CoBiz acquisition was not yet allocated to the operating segments as of December 31, 2018 and is included in Funds Management and Other above.
[2] Goodwill from Mobank acquisition was not yet allocated to the segments as of December 31, 2016. Adjustment was made in 2017 for final purchase price adjustments and to allocate to the segments.