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Goodwill and Other Intangible Assets | 3 Months Ended
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Mar. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Other Intangible Assets | Goodwill and Other Intangible Assets Goodwill Goodwill is not amortized but is instead subject to impairment tests on at least an annual basis, and more frequently if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying amount. The Corporation conducted its most recent annual impairment testing in May 2024, utilizing a qualitative assessment. Based on this assessment, management concluded that it is more likely than not that the estimated fair value exceeded the carrying value (including goodwill) for each reporting unit. Therefore, a step one quantitative analysis was not required. There have been no events since the May 2024 impairment test that have changed the Corporation's impairment assessment conclusion. There were no impairment charges recorded in 2024 or the first three months of 2025. The Corporation had goodwill of $1.1 billion at both March 31, 2025 and December 31, 2024. Core Deposit Intangibles The Corporation has CDIs which are amortized. Changes in the gross carrying amount, accumulated amortization, and net book value for CDIs were as follows:
($ in thousands) | Three Months Ended Mar 31, 2025 | Year Ended Dec 31, 2024
Core deposit intangibles |  |
Gross carrying amount at the beginning of period | $ | 88,109 |  | $ | 88,109 |
Accumulated amortization | (58,652) |  | (56,449) |
Net book value | $ | 29,457 |  | $ | 31,660 |
Amortization during the period | $ | 2,203 |  | $ | 8,811 |
Mortgage Servicing Rights The Corporation sells residential mortgage loans in the secondary market and typically retains the right to service the loans sold. MSRs are not traded in active markets. As a result, a cash flow model is used to determine fair value. Key assumptions and estimates, including projected prepayment speeds, assumed servicing costs, ancillary income, costs to service delinquent loans, costs of foreclosure, and discount rates with option-adjusted spreads, are used in measuring the fair value of the MSRs asset. These assumptions are considered significant unobservable inputs. See Note 11 for a discussion of the recourse provisions on sold residential mortgage loans. See Note 12 which further discusses fair value measurement relative to the MSRs asset. A summary of changes in the balance of the MSRs asset under the fair value measurement method is as follows:
($ in thousands) | Three Months Ended Mar 31, 2025 | Year Ended Dec 31, 2024 |
Mortgage servicing rights |  |  |
Mortgage servicing rights at beginning of period | $ | 87,683 |  | $ | 84,390 |  |
Additions | 1,346 |  | 6,707 |  |
Decay | (1,731) |  | (8,060) |  |
Valuation: |  |  |
Changes in fair value of asset | (1,047) |  | 4,646 |  |
Mortgage servicing rights at end of period | $ | 86,251 |  | $ | 87,683 |  |
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”) | $ | 6,242,796 |  | $ | 6,285,018 |  |
Mortgage servicing rights to servicing portfolio | 1.38 | % | 1.40 | % |
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 March 31, 2025. 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
Nine months ended December 31, 2025 | $ | 6,608 |  |  | $ | 6,787 |
2026 | 8,811 |  |  | 11,469 |
2027 | 8,811 |  |  | 11,456 |
2028 | 3,485 |  |  | 10,799 |
2029 | 1,681 |  |  | 9,827 |
2030 | 61 |  |  | 8,782 |
Beyond 2030 | — |  |  | 27,131 |
Total estimated amortization expense and MSRs decay(a) | $ | 29,457 |  |  | $ | 86,251 |
(a) Includes 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 The entire disclosure for goodwill and intangible assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-30/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-20/tableOfContent + Details
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