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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
The Corporation has CDIs which are amortized. Changes in the gross carrying amount, accumulated amortization, and net book value for CDIs were as follows:
(in thousands)202520242023
Core deposit intangibles
Gross carrying amount at the beginning of the year$88,109 $88,109 $88,109 
Accumulated amortization(65,260)(56,449)(47,638)
Net book value$22,849 $31,660 $40,471 
Amortization during the year$8,811 $8,811 $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)20252024
Mortgage servicing rights
Mortgage servicing rights at beginning of period$87,683 $84,390 
Additions8,716 6,707 
Decay(8,621)(8,060)
Valuation:
Changes in fair value of asset(1,441)4,646 
Mortgage servicing rights at end of period$86,337 $87,683 
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)$6,191,012 $6,285,018 
Mortgage servicing rights to servicing portfolio1.39 %1.40 %
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
The projections of amortization expense for CDIs and decay for MSRs are based on existing asset balances, the current interest rate environment, and prepayment speeds as of December 31, 2025. The actual expense the Corporation recognizes in any given period may be significantly different depending upon acquisition or sale activities, changes in interest rates, prepayment speeds, market conditions, regulatory requirements, and events or circumstances that indicate the carrying amount of an asset may not be recoverable. The following table shows the estimated future yearly amortization expense for CDIs and decay for MSRs:
(in thousands)Core Deposit IntangiblesMortgage Servicing Rights
2026$8,811 $10,559 
20278,811 11,814 
20283,485 11,616 
20291,681 10,645 
203061 9,440 
Beyond 2030— 32,263 
Total estimated amortization expense and MSRs decay(a)
$22,849 $86,337 
(a) Includes the decrease in value due to passage of time, including the impact from both regularly scheduled principal payments and partial loan paydowns.