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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Finite-Lived Intangible Assets [Table Text Block] | The Corporation has CDIs which are amortized. Changes in the gross carrying amount, accumulated amortization, and net book value for CDIs were as follows:
($ in thousands) | 2024 | 2023 | 2022
Core deposit intangibles |  |  |
Gross carrying amount at the beginning of the year | $ | 88,109 |  | $ | 88,109 |  | $ | 88,109 |
Accumulated amortization | (56,449) |  | (47,638) |  | (38,827) |
Net book value | $ | 31,660 |  | $ | 40,471 |  | $ | 49,282 |
Amortization during the year | $ | 8,811 |  | $ | 8,811 |  | $ | 8,811 |
Schedule of Servicing Assets at Fair Value [Table Text Block] | A summary of changes in the balance of the MSRs asset under the fair value measurement method is as follows:
($ in thousands) | 2024 | 2023 |
Mortgage servicing rights |  |  |
Mortgage servicing rights at beginning of period | $ | 84,390 |  | $ | 77,351 |  |
Additions | 6,707 |  | 3,564 |  |
Decay | (8,060) |  | (7,185) |  |
Valuation: |  |  |
Change in fair value model assumptions | — |  | 8,881 |  |
Changes in fair value of asset | 4,646 |  | 1,778 |  |
Mortgage servicing rights at end of period | $ | 87,683 |  | $ | 84,390 |  |
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)(a) | $ | 6,285,018 |  | $ | 7,364,492 |  |
Mortgage servicing rights to servicing portfolio(a) | 1.40 | % | 1.15 | % |
(a) During the fourth quarter of 2023, the Corporation transferred $969 million of residential mortgages into held for sale and subsequently sold them for $844 million. After sale, the servicing was retained for a short period until full servicing was transferred to the purchaser in January 2024.
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] | The projections of amortization expense for CDIs and decay for MSRs are based on existing asset balances, the current interest rate environment, and prepayment speeds as of December 31, 2024. The actual expense the Corporation recognizes in any given period may be significantly different depending upon acquisition or sale activities, changes in interest rates, prepayment speeds, market conditions, regulatory requirements, and events or circumstances that indicate the carrying amount of an asset may not be recoverable. The following table shows the estimated future yearly amortization expense for CDIs and decay for MSRs:
($ in thousands) | Core Deposit Intangibles |  |  | Mortgage Servicing Rights
2025 | $ | 8,811 |  |  |  | $ | 9,767 |
2026 | 8,811 |  |  |  | 11,230 |
2027 | 8,811 |  |  |  | 11,602 |
2028 | 3,485 |  |  |  | 10,945 |
2029 | 1,681 |  |  |  | 9,767 |
Beyond 2029 | 61 |  |  |  | 34,373 |
Total estimated amortization expense and MSRs decay(a) | $ | 31,660 |  |  |  | $ | 87,683 |
(a) Represents the decrease in value due to passage of time, including the impact from both regularly scheduled principal payments and partial loan paydowns.

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 + Details
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- Definition Tabular disclosure of the activity in the balance of servicing assets (including a description of where changes in fair value are reported in the statement of income for each period for which results of operations are presented), including but not limited to, the following: beginning and ending balances, additions (for instance, through purchases of servicing assets), disposals, changes in fair value during the period resulting from changes in inputs or assumptions used in the valuation model, other changes in fair value along with a description of those changes, and other changes that affect the balance along with a description of those changes. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481229/860-50-50-3 + Details
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