Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Income Tax Disclosure [Abstract]
Deferred Tax Asset, Tax Deferred Expense, Lease Liability	$ 9,175	$ 9,561
Deferred Tax Assets, Gross [Abstract]
Allowance for credit losses	26,980	25,459
Postretirement benefits other than pensions	89	201
Deferred Tax Assets, Operating Loss Carryforwards	60	61
Deferred compensation	3,289	3,008
Accrued interest on nonaccrual loans	763	1,088
Accrued incentives	3,949	3,295
Unfunded loan commitments & other reserves	1,757	879
Deferred Tax Assets Purchase Accounting Adjustments	3,889	4,001
Other	1,127	744
Total deferred tax assets	68,900	76,320
Deferred tax liabilities:
Loan origination fees and costs	(4,268)	(2,615)
Deferred Tax Liabilities, Leasing Arrangements	8,215	8,601
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(2,608)	(1,586)
Section 197 intangibles	(4,019)	(3,175)
Deferred Tax Liabilities Purchase Accounting Adjustments	3,231	2,755
Other	(695)	(718)
Total deferred tax liabilities	(23,036)	(19,450)
Net deferred tax asset	45,864	56,870
Unrealized loss on securities available for sale	$ 17,822	$ 28,023