Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Deferred Tax Asset, Tax Deferred Expense, Lease Liability	$ 9,489	$ 9,928
Deferred Tax Assets, Gross [Abstract]
Allowance for credit losses	19,597	21,483
Postretirement benefits other than pensions	235	242
Deferred Tax Assets, Operating Loss Carryforwards	75	385
Deferred compensation	1,969	1,723
Accrued interest on nonaccrual loans	779	644
Accrued incentives	2,591	2,182
Unfunded loan commitments & other reserves	1,363	1,576
Other	988	1,831
Total deferred tax assets	39,443	39,994
Deferred tax liabilities:
Loan origination fees and costs	(253)	(1,280)
Deferred Tax Liabilities, Leasing Arrangements	8,589	9,037
Net Unrealized Gain On Investment Securities Available For Sale	0	4,629
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(1,725)	(2,103)
Section 197 intangibles	(1,107)	(540)
Other	(308)	(424)
Total deferred tax liabilities	(11,982)	(18,013)
Net deferred tax asset	27,461	21,981
Unrealized loss on securities available for sale	$ 2,357	$ 0