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Goodwill and Other Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 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)Three Months Ended March 31, 2023Year Ended Dec 31, 2022
Core deposit intangibles
Gross carrying amount at the beginning of period$88,109 $88,109 
Accumulated amortization(41,030)(38,827)
Net book value$47,079 $49,282 
Amortization during the period$2,203 $8,811 
Summary of changes in balance of mortgage servicing rights asset and mortgage servicing rights valuation allowance
A summary of changes in the balance of the MSRs asset under the fair value measurement method for the three months ended March 31, 2023 and the year ended December 31, 2022 is as follows:
($ in thousands)Three Months Ended March 31, 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 
Additions474 7,279 
Paydowns(1,489)(9,350)
Valuation:
Change in fair value model assumptions— 5,715 
Changes in fair value of asset(1,857)16,549 
Mortgage servicing rights at end of period$74,479 $77,351 
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)$6,611,770 $6,711,820 
Mortgage servicing rights to servicing portfolio1.13 %1.15 %
Summary of estimated future amortization expense The following table shows the estimated future amortization expense for CDIs and decay for MSRs:
($ in thousands)Core Deposit IntangiblesMortgage Servicing Rights
Nine months ended December 31, 2023$6,608 $9,713 
20248,811 12,079 
20258,811 10,382 
20268,811 8,924 
20278,811 7,518 
20283,485 6,564 
Beyond 20281,742 19,299 
Total estimated amortization expense and MSRs decay$47,079 $74,479