Goodwill and Other Intangible Assets (Tables)

6 Months Ended

Jun. 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)	Six Months Ended Jun 30, 2026		Year Ended Dec 31, 2025
Core deposit intangibles
Gross carrying amount at the beginning of period	$	88,109	$	88,109
Additions during the period	103,200		—
Accumulated amortization	(74,356)		(65,260)
Net book value	$	116,953	$	22,849
Amortization during the period	$	9,096	$	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, 2026			Year Ended Dec 31, 2025
Mortgage servicing rights
Mortgage servicing rights at beginning of period	$	86,337		$	87,683
Additions	6,159			8,716
Decay	(4,899)			(8,621)
Valuation:
Changes in fair value of asset	86			(1,441)
Mortgage servicing rights at end of period	$	87,683		$	86,337
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)	$	6,160,254		$	6,191,012
Mortgage servicing rights to servicing portfolio	1.42		%	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 Intangibles		Mortgage Servicing Rights
Six Months Ended December 31, 2026	$	13,788	$	4,817
2027	26,167		11,601
2028	18,965		11,838
2029	15,285		11,189
2030	11,788		10,214
2031	9,851		9,123
Beyond 2031	21,109		28,901
Total estimated amortization expense and MSRs decay(a)	$	116,953	$	87,683

(a) Includes the decrease in value due to passage of time, including the impact from both regularly scheduled principal payments and partial loan paydowns.