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Goodwill and Other Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2025
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)Six Months Ended Jun 30, 2025Year Ended Dec 31, 2024
Core deposit intangibles
Gross carrying amount at the beginning of period$88,109 $88,109 
Accumulated amortization(60,854)(56,449)
Net book value$27,255 $31,660 
Amortization during the period$4,405 $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)Six Months Ended Jun 30, 2025Year Ended Dec 31, 2024
Mortgage servicing rights
Mortgage servicing rights at beginning of period$87,683 $84,390 
Additions3,256 6,707 
Decay(4,062)(8,060)
Valuation:
Changes in fair value of asset(1,632)4,646 
Mortgage servicing rights at end of period$85,245 $87,683 
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)$6,185,631 $6,285,018 
Mortgage servicing rights to servicing portfolio1.38 %1.40 %
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
Six months ended December 31, 2025$4,405 $4,695 
20268,811 10,817 
20278,811 11,309 
20283,485 10,955 
20291,681 9,945 
203061 8,840 
Beyond 2030— 28,684 
Total estimated amortization expense and MSRs decay(a)
$27,255 $85,245