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Comprehensive Income (Loss), Net of Tax - Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Before-Tax Amount |  |  |
Other comprehensive income (loss) | $ 7,446 | $ 9,993 | $ (6,657)
Tax Expense (Benefit) |  |  |
Other comprehensive income (loss) | (1,905) | (2,540) | 1,692
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] |  |  |
Other comprehensive income (loss) before reclassifications | 5,187 | 6,776 | (5,287)
Reclassification from AOCI, current period | 354 | 677 | 322
Other Comprehensive Income (Loss) | 5,541 | 7,453 | (4,965)
Unrealized Gains and Losses on Available for Sale Securities |  |  |
Before-Tax Amount |  |  |
OCI, before reclassifications | 7,129 | 5,580 | (2,839)
Reclassification from AOCI, current period | 37 |  |
Tax Expense (Benefit) |  |  |
Other comprehensive income (loss) before reclassifications | 1,823 | 1,418 | (723)
Reclassification from AOCI, current period | (9) |  |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] |  |  |
Other comprehensive income (loss) before reclassifications | 5,306 | 4,162 | (2,116)
Reclassification from AOCI, current period | 28 | 0 | 0
Other Comprehensive Income (Loss) | 5,334 | 4,162 | (2,116)
Net Unrealized Gains on Cash Flow Swap |  |  |
Before-Tax Amount |  |  |
OCI, before reclassifications | 651 |  |
Tax Expense (Benefit) |  |  |
Other comprehensive income (loss) before reclassifications | 166 |  |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] |  |  |
Other comprehensive income (loss) before reclassifications | 485 | 0 |
Reclassification from AOCI, current period |  | 0 |
Other Comprehensive Income (Loss) | 485 | 0 |
Net Actuarial Gain (Loss) |  |  |
Before-Tax Amount |  |  |
OCI, before reclassifications | (337) | 3,505 | (3,798)
Tax Expense (Benefit) |  |  |
Other comprehensive income (loss) before reclassifications | (86) | 891 | (965)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] |  |  |
Other comprehensive income (loss) before reclassifications | (251) | 2,614 | (2,833)
Reclassification from AOCI, current period | 169 | 510 | 242
Other Comprehensive Income (Loss) | (82) | 3,124 | (2,591)
Net Prior Service (Cost) Credit |  |  |
Before-Tax Amount |  |  |
OCI, before reclassifications | (472) |  | (453)
Tax Expense (Benefit) |  |  |
Other comprehensive income (loss) before reclassifications | (119) |  | (115)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] |  |  |
Other comprehensive income (loss) before reclassifications | (353) | 0 | (338)
Reclassification from AOCI, current period | 157 | 167 | 80
Other Comprehensive Income (Loss) | (196) | 167 | (258)
Net Retirement Plan Gains and Losses |  |  |
Before-Tax Amount |  |  |
Reclassification from AOCI, current period | 227 | 684 | 325
Tax Expense (Benefit) |  |  |
Reclassification from AOCI, current period | (58) | (174) | (83)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] |  |  |
Reclassification from AOCI, current period | 169 | 510 | 242
Accretion of Net Prior Service (Cost) Credit |  |  |
Before-Tax Amount |  |  |
Reclassification from AOCI, current period | 211 | 224 | 108
Tax Expense (Benefit) |  |  |
Reclassification from AOCI, current period | (54) | (57) | (28)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] |  |  |
Reclassification from AOCI, current period | $ 157 | $ 167 | $ 80

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