v3.26.3
Goodwill and Other Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2026
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, 2026Year Ended Dec 31, 2025
Core deposit intangibles
Gross carrying amount at the beginning of period$88,109 $88,109 
Additions during the period103,200 — 
Accumulated amortization(81,250)(65,260)
Net book value$110,059 $22,849 
Amortization during the period$15,990 $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)Nine Months Ended Sep 30, 2026Year Ended Dec 31, 2025
Mortgage servicing rights
Mortgage servicing rights at beginning of period$86,337 $87,683 
Additions9,391 8,716 
Decay(7,479)(8,621)
Valuation:
Changes in fair value of asset6,670 (1,441)
Mortgage servicing rights at end of period$94,919 $86,337 
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)$6,164,126 $6,191,012 
Mortgage servicing rights to servicing portfolio1.54 %1.39 %
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] The following table shows the estimated future yearly amortization expense for CDIs and decay for MSRs:
(in thousands)Core Deposit IntangiblesMortgage Servicing Rights
Three Months Ended December 31, 2026$6,894 $2,157 
202726,167 11,051 
202818,965 12,226 
202915,285 11,773 
203011,788 11,137 
20319,851 10,368 
Beyond 203121,109 36,207 
Total estimated amortization expense and MSRs decay(a)
$110,059 $94,919 
(a) Includes the decrease in value due to passage of time, including the impact from both regularly scheduled principal payments and partial loan paydowns.