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Goodwill and Intangible Assets (Tables)
 12 Months Ended
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)202420232022
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)20242023
Mortgage servicing rights
Mortgage servicing rights at beginning of period$84,390 $77,351 
Additions6,707 3,564 
Decay(8,060)(7,185)
Valuation:
Change in fair value model assumptions— 8,881 
Changes in fair value of asset4,646 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 IntangiblesMortgage Servicing Rights
2025$8,811 $9,767 
20268,811 11,230 
20278,811 11,602 
20283,485 10,945 
20291,681 9,767 
Beyond 202961 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.