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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.

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