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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Allowance for loan losses | $ 3,259 | $ 3,413
OREO | 0 | 9
Accrued pension and post-retirement | 887 | 948
Unrealized loss on securities available for sale | 457 | 0
Unrealized loss on derivative instruments | 544 | 1,865
Unrealized loss on securities transferred from available for sale to held to maturity | 23 | 35
Restricted stock grants | 308 | 270
Core deposit intangible | 29 | 24
Investment in flow through entities | 79 | 82
Other assets | 35 | 87
Total deferred tax asset | 5,621 | 6,733
Net deferred loan costs | (2,055) | (1,894)
Depreciation | (2,334) | (2,013)
Unrealized gain on securities available for sale | 0 | (1,332)
Goodwill | (214) | (161)
Mortgage servicing rights | (561) | (411)
Unrealized gain on derivative instruments | (544) | (554)
Prepaid expense | (295) | (195)
Total deferred tax liability | (6,003) | (6,560)
Net deferred tax asset (liability) | $ (382) |
Net deferred tax asset (liability) |  | $ 173

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