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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2023
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,
|  | 2023 |  | 2022
Core deposit premiums |  | $ | 103,200 |  |  | $ | 103,200 |
Less: Accumulated amortization |  | 65,275 |  |  | 55,130 |
Net core deposit premiums |  | 37,925 |  |  | 48,070 |
Other identifiable intangible assets |  | 67,151 |  |  | 78,154 |
Less: Accumulated amortization |  | 45,097 |  |  | 50,093 |
Net other identifiable intangible assets |  | 22,054 |  |  | 28,061 |
Total intangible assets, net |  | $ | 59,979 |  |  | $ | 76,131 |
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
2024 |  | $ | 9,379 |  |  | $ | 2,163 |  |  | $ | 11,542 |
2025 |  | 8,675 |  |  | 1,817 |  |  | 10,492 |
2026 |  | 7,986 |  |  | 1,498 |  |  | 9,484 |
2027 |  | 6,956 |  |  | 1,313 |  |  | 8,269 |
2028 |  | 4,929 |  |  | 1,022 |  |  | 5,951 |
Thereafter |  | — |  |  | 14,241 |  |  | 14,241 |
Total |  | $ | 37,925 |  |  | $ | 22,054 |  |  | $ | 59,979 |
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, 2021 |  | $ | 910,589 |  |  | $ | 43,458 |  |  | $ | 90,702 |  |  | $ | — |  |  | $ | 1,044,749 |
Balance, December 31, 2022 |  | 910,589 |  |  | 43,458 |  |  | 90,702 |  |  | — |  |  | 1,044,749 |
Balance, December 31, 2023 |  | 910,589 |  |  | 43,458 |  |  | 90,702 |  |  | — |  |  | 1,044,749 |

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