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Comprehensive Income (Loss), Net of Tax - Changes in Accumulated Other Comprehensive Income By Component (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning balance | $ 334,392 | $ 301,728 | $ 269,584
Other comprehensive income before reclassifications | 1,016 | 5,187 | 6,776
Amounts reclassified from accumulated other comprehensive income | 147 | 354 | 677
Other Comprehensive Income | 1,163 | 5,541 | 7,453
Ending balance | 371,186 | 334,392 | 301,728
Accumulated Other Comprehensive Income (Loss) |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning balance | (816) | (6,357) | (13,810)
Other Comprehensive Income | 1,163 | 5,541 | 7,453
Ending balance | 347 | (816) | (6,357)
Unrealized Gains and Losses on Available for Sale Securities |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning balance | 5,799 | 465 | (3,697)
Other comprehensive income before reclassifications | (6,413) | 5,306 | 4,162
Amounts reclassified from accumulated other comprehensive income | 0 | 28 | 0
Other Comprehensive Income | (6,413) | 5,334 | 4,162
Ending balance | (614) | 5,799 | 465
Unrealized Gain on Cash Flow Swap |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning balance | 485 | 0 | 0
Other comprehensive income before reclassifications | 929 | 485 | 0
Amounts reclassified from accumulated other comprehensive income | (94) | 0 | 0
Other Comprehensive Income | 835 | 485 | 0
Ending balance | 1,320 | 485 | 0
Net Actuarial Gain (Loss) |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning balance | (5,929) | (5,847) | (8,971)
Other comprehensive income before reclassifications | 6,500 | (251) | 2,614
Amounts reclassified from accumulated other comprehensive income | 68 | 169 | 510
Other Comprehensive Income | 6,568 | (82) | 3,124
Ending balance | 639 | (5,929) | (5,847)
Net Prior Service (Cost) Credit |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning balance | (1,171) | (975) | (1,142)
Other comprehensive income before reclassifications | 0 | (353) | 0
Amounts reclassified from accumulated other comprehensive income | 173 | 157 | 167
Other Comprehensive Income | 173 | (196) | 167
Ending balance | $ (998) | $ (1,171) | $ (975)

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