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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Income Tax Disclosure [Abstract] |  |
Allowance for loan losses | $ 3,512 | $ 3,259
Accrued pension and post-retirement | 828 | 887
Unrealized loss on securities available for sale | 11,887 | 457
Unrealized loss on derivative instruments | 1,031 | 544
Unrealized loss on securities transferred from available for sale to held to maturity | 17 | 23
Restricted stock grants | 320 | 308
Core deposit intangible | 34 | 29
Investment in flow through entities | 87 | 79
Other assets | 41 | 35
Total deferred tax asset | 17,757 | 5,621
Net deferred loan costs | (2,285) | (2,055)
Depreciation | (2,272) | (2,334)
Goodwill | (267) | (214)
Mortgage servicing rights | (524) | (561)
Unrealized gain on derivative instruments | (1,176) | (544)
Prepaid expense | (252) | (295)
Total deferred tax liability | (6,776) | (6,003)
Net deferred tax asset (liability) | $ 10,981 |
Net deferred tax asset (liability) |  | $ (382)

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