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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2021
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,
|  | 2021 |  | 2020
Core deposit premiums |  | $ | 103,200 |  |  | $ | 103,200 |
Less accumulated amortization |  | 44,149 |  |  | 32,256 |
Net core deposit premiums |  | 59,051 |  |  | 70,944 |
Other identifiable intangible assets |  | 78,154 |  |  | 82,731 |
Less accumulated amortization |  | 45,427 |  |  | 40,239 |
Net other identifiable intangible assets |  | 32,727 |  |  | 42,492 |
Total intangible assets, net |  | $ | 91,778 |  |  | $ | 113,436 |
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
2022 |  | $ | 10,981 |  |  | $ | 4,665 |  |  | $ | 15,646 |
2023 |  | 10,145 |  |  | 3,625 |  |  | 13,770 |
2024 |  | 9,379 |  |  | 2,611 |  |  | 11,990 |
2025 |  | 8,675 |  |  | 2,201 |  |  | 10,876 |
2026 |  | 7,986 |  |  | 1,828 |  |  | 9,814 |
Thereafter |  | 11,885 |  |  | 17,797 |  |  | 29,682 |
|  | $ | 59,051 |  |  | $ | 32,727 |  |  | $ | 91,778 |
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, 2019 |  | $ | 913,931 |  |  | $ | 43,458 |  |  | $ | 90,702 |  |  | $ | — |  |  | $ | 1,048,091 |
Balance, December 31, 2020 |  | 913,931 |  |  | 43,458 |  |  | 90,702 |  |  | — |  |  | 1,048,091 |
Sale of consolidated merchant banking investment during 2021 |  | (3,342) |  |  | — |  |  | — |  |  | — |  |  | (3,342) |
Balance, December 31, 2021 |  | $ | 910,589 |  |  | $ | 43,458 |  |  | $ | 90,702 |  |  | $ | — |  |  | $ | 1,044,749 |

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