Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Allowance for credit losses	$ 5,380	$ 3,512
Accrued pension and post-retirement	752	828
Unrealized loss on securities available for sale	10,520	11,887
Unrealized loss on derivative instruments	913	1,031
Unrealized loss on securities transferred from available for sale to held to maturity	15	17
Restricted stock grants	323	320
Core deposit intangible	29	34
Investment in flow through entities	99	87
Other assets	24	41
Total deferred tax asset	18,055	17,757
Net deferred loan costs	(2,599)	(2,285)
Depreciation	(2,383)	(2,272)
Goodwill	(319)	(267)
Mortgage servicing rights	(457)	(524)
Unrealized gain on derivative instruments	(993)	(1,176)
Prepaid expense	(276)	(252)
Total deferred tax liability	(7,027)	(6,776)
Net deferred tax asset	$ 11,028	$ 10,981