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Goodwill and Other Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2023
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)Nine Months Ended September 30, 2023Year Ended Dec 31, 2022
Core deposit intangibles
Gross carrying amount at the beginning of period$88,109 $88,109 
Accumulated amortization(45,435)(38,827)
Net book value$42,674 $49,282 
Amortization during the period$6,608 $8,811 
Summary of changes in balance of mortgage servicing rights asset and mortgage servicing rights valuation allowance
A summary of changes in the balance of the MSRs asset under the fair value measurement method for the nine months ended September 30, 2023 and the year ended December 31, 2022 is as follows:
($ in thousands)Nine Months Ended September 30, 2023Year Ended Dec 31, 2022
Mortgage servicing rights
Mortgage servicing rights at beginning of period$77,351 $54,862 
Cumulative effect of accounting methodology changeN/A2,296 
Balance at beginning of period, adjusted$77,351 $57,158 
Additions2,477 7,279 
Paydowns(5,354)(9,350)
Valuation:
Change in fair value model assumptions8,338 5,715 
Changes in fair value of asset6,320 16,549 
Mortgage servicing rights at end of period$89,131 $77,351 
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)$6,451,969 $6,711,820 
Mortgage servicing rights to servicing portfolio1.38 %1.15 %
Summary of estimated future amortization expense The following table shows the estimated future amortization expense for CDIs and decay for MSRs:
($ in thousands)Core Deposit IntangiblesMortgage Servicing Rights
Three months ended December 31, 2023$2,203 $3,630 
20248,811 13,789 
20258,811 12,373 
20268,811 11,111 
20278,811 9,768 
20283,485 8,641 
Beyond 20281,742 29,819 
Total estimated amortization expense and MSRs decay$42,674 $89,131