Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Deferred tax assets:
Loans, principally due to allowance for loan losses	$ 35,766	$ 36,901
Accrued expenses	25,958	26,983
Buildings and equipment	711	928
Unrealized loss on available-for-sale securities	11,303	45,573
Core deposit intangible	1,201	749
Unearned revenue	297	526
Total gross deferred tax assets	75,236	111,660
Deferred tax liabilities:
Prepaid pension expense	10,802	10,602
Mortgage servicing rights	7,007	7,253
Goodwill	37,014	35,924
Lease financing	22,063	29,502
Unrealized gain on equity securities	909	698
Capitalized loan costs	6,021	1,773
Defined benefit plan	1,766	1,214
Other	1,399	1,362
Total gross deferred tax liabilities	86,981	88,328
Net deferred taxes	$ (11,745)
Net deferred taxes		$ 23,332