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Goodwill and Other Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of core deposit intangibles and other intangibles Changes in the gross carrying amount, accumulated amortization, and net book value for CDIs were as follows:
($ in thousands)Three Months Ended March 31, 2024Year Ended Dec 31, 2023
Core deposit intangibles
Gross carrying amount at the beginning of period$88,109 $88,109 
Accumulated amortization(49,841)(47,638)
Net book value$38,268 $40,471 
Amortization during the period$2,203 $8,811 
Summary of changes in balance of mortgage servicing rights asset and mortgage servicing rights valuation allowance
A summary of changes in the balance of the MSRs asset under the fair value measurement method for the three months ended March 31, 2024 and the year ended December 31, 2023 is as follows:
($ in thousands)Three Months Ended March 31, 2024Year Ended Dec 31, 2023
Mortgage servicing rights
Mortgage servicing rights at beginning of period$84,390 $77,351 
Additions877 3,564 
Paydowns(1,687)(7,185)
Valuation:
Change in fair value model assumptions— 8,881 
Changes in fair value of asset1,646 1,778 
Mortgage servicing rights at end of period$85,226 $84,390 
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)(a)
$6,349,049 $7,364,492 
Mortgage servicing rights to servicing portfolio(a)
1.34 %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 $844 million. After sale, the servicing was retained for a short period until full servicing was transferred to the purchaser in January 2024.
Summary of estimated future amortization expense The following table shows the estimated future amortization expense for CDIs and decay for MSRs:
($ in thousands)Core Deposit IntangiblesMortgage Servicing Rights
Nine months ended December 31, 2024$6,608 $6,930 
20258,811 11,133 
20268,811 11,013 
20278,811 10,506 
20283,485 9,628 
20291,681 8,614 
Beyond 202961 27,402 
Total estimated amortization expense and MSRs decay$38,268 $85,226