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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Finite-Lived Intangible Assets [Table Text Block] | The following table presents the original cost and accumulated amortization of intangible assets (in thousands):
|  | Dec. 31,
|  | 2019 |  | 2018
Core deposit premiums |  | $ | 103,200 |  |  | $ | 103,200 |
Less accumulated amortization |  | 19,364 |  |  | 5,032 |
Net core deposit premiums |  | 83,836 |  |  | 98,168 |
Other identifiable intangible assets |  | 74,372 |  |  | 63,497 |
Less accumulated amortization |  | 32,937 |  |  | 26,816 |
Net other identifiable intangible assets |  | 41,435 |  |  | 36,681 |
Total intangible assets, net |  | $ | 125,271 |  |  | $ | 134,849 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] | Expected amortization expense for intangible assets that will continue to be amortized (in thousands):
|  | Core Deposit Premiums |  | Other Identifiable Intangible Assets |  | Total
2020 |  | $ | 12,892 |  |  | $ | 7,405 |  |  | $ | 20,297 |
2021 |  | 11,893 |  |  | 6,706 |  |  | 18,599 |
2022 |  | 10,981 |  |  | 5,339 |  |  | 16,320 |
2023 |  | 10,145 |  |  | 4,298 |  |  | 14,443 |
2024 |  | 9,379 |  |  | 3,284 |  |  | 12,663 |
Thereafter |  | 28,546 |  |  | 14,403 |  |  | 42,949 |
|  | $ | 83,836 |  |  | $ | 41,435 |  |  | $ | 125,271 |
Schedule of Goodwill [Table Text Block] | The changes in the carrying value of goodwill by operating segment are as follows (in thousands):
|  | Commercial Banking |  | Consumer Banking |  | Wealth Management |  | Funds Management and Other |  | Total
Balance, December 31, 2017 |  | 313,270 |  |  | 43,458 |  |  | 90,702 |  |  | — |  |  | 447,430 |
Goodwill recognized during 2018 1 |  | — |  |  | — |  |  | — |  |  | 601,833 |  |  | 601,833 |
Balance, December 31, 2018 |  | 313,270 |  |  | 43,458 |  |  | 90,702 |  |  | 601,833 |  |  | 1,049,263 |
Adjustment 1 |  | 600,661 |  |  | — |  |  | — |  |  | (601,833 | ) |  | (1,172 | )
Balance, December 31, 2019 |  | $ | 913,931 |  |  | $ | 43,458 |  |  | $ | 90,702 |  |  | $ | — |  |  | $ | 1,048,091 |
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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