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Goodwill and Other Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Finite-Lived Intangible Assets [Table Text Block] Changes in the gross carrying amount, accumulated amortization, and net book value for CDIs were as follows:
($ in thousands)Nine Months Ended Sep 30, 2024Year Ended Dec 31, 2023
Core deposit intangibles
Gross carrying amount at the beginning of period$88,109 $88,109 
Accumulated amortization(54,246)(47,638)
Net book value$33,863 $40,471 
Amortization during the period$6,608 $8,811 
Schedule of Servicing Assets at Fair Value [Table Text Block]
A summary of changes in the balance of the MSRs asset under the fair value measurement method for the nine months ended September 30, 2024 and the year ended December 31, 2023 is as follows:
($ in thousands)Nine Months Ended Sep 30, 2024Year Ended Dec 31, 2023
Mortgage servicing rights
Mortgage servicing rights at beginning of period$84,390 $77,351 
Additions4,458 3,564 
Decay(5,913)(7,185)
Valuation:
Change in fair value model assumptions— 8,881 
Changes in fair value of asset(959)1,778 
Mortgage servicing rights at end of period$81,977 $84,390 
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)(a)
$6,302,408 $7,364,492 
Mortgage servicing rights to servicing portfolio(a)
1.30 %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 $844 million. After sale, the servicing was retained for a short period until full servicing was transferred to the purchaser in January 2024.
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] The following table shows the estimated future amortization expense for CDIs and decay for MSRs:
($ in thousands)Core Deposit IntangiblesMortgage Servicing Rights
Three months ended December 31, 2024$2,203 $2,458 
20258,811 11,983 
20268,811 11,479 
20278,811 10,478 
20283,485 9,379 
20291,681 8,224 
Beyond 202961 27,975 
Total estimated amortization expense and MSRs decay$33,863 $81,977