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Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, net |  | $ 125,271 | $ 134,849
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |
2020 |  | 20,297 |
2021 |  | 18,599 |
2022 |  | 16,320 |
2023 |  | 14,443 |
2024 |  | 12,663 |
Thereafter |  | 42,949 |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance |  | 1,049,263 | 447,430
Goodwill recognized during period | [1] |  | 601,833
Adjustment | [1] | (1,172) |
Goodwill, Ending Balance |  | 1,048,091 | 1,049,263
Commercial [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance |  | 313,270 | 313,270
Goodwill recognized during period | [1] |  | 0
Adjustment | [1] | 600,661 |
Goodwill, Ending Balance |  | 913,931 | 313,270
Consumer [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance |  | 43,458 | 43,458
Goodwill recognized during period | [1] |  | 0
Adjustment | [1] | 0 |
Goodwill, Ending Balance |  | 43,458 | 43,458
Wealth Management [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance |  | 90,702 | 90,702
Goodwill recognized during period | [1] |  | 0
Adjustment | [1] | 0 |
Goodwill, Ending Balance |  | 90,702 | 90,702
Funds Management and Other [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance |  | 601,833 | 0
Goodwill recognized during period | [1] |  | 601,833
Adjustment | [1] | (601,833) |
Goodwill, Ending Balance |  | 0 | 601,833
Core deposits premiums [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross |  | 103,200 | 103,200
Accumulated amortization |  | 19,364 | 5,032
Finite-lived intangible assets, net |  | 83,836 | 98,168
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |
2020 |  | 12,892 |
2021 |  | 11,893 |
2022 |  | 10,981 |
2023 |  | 10,145 |
2024 |  | 9,379 |
Thereafter |  | 28,546 |
Other identifiable intangible assets [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross |  | 74,372 | 63,497
Accumulated amortization |  | 32,937 | 26,816
Finite-lived intangible assets, net |  | 41,435 | $ 36,681
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |
2020 |  | 7,405 |
2021 |  | 6,706 |
2022 |  | 5,339 |
2023 |  | 4,298 |
2024 |  | 3,284 |
Thereafter |  | $ 14,403 |
[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.

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