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Comprehensive Income (Loss), Net of Tax - Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Before-Tax Amount |  |  |
Other comprehensive income (loss) | $ 9,993 | $ (6,657) | $ (370)
Tax Expense (Benefit) |  |  |
Other comprehensive income (loss) | (2,540) | 1,692 | 335
Net-of-Tax Amount |  |  |
Net Unrealized Securities Holding Gains Arising During the Period | 6,776 | (5,287) | (726)
Amortization of Net Retirement Plan | 677 | 322 | 691
Other comprehensive income (loss) | 7,453 | (4,965) | (35)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent |  |  |
Before-Tax Amount |  |  |
Net Unrealized Securities Holding Gains Arising During the Period | 5,580 | (2,839) | (1,505)
Amortization of Net Retirement Plan |  |  | 448
Tax Expense (Benefit) |  |  |
Net Unrealized Securities Holding Gains Arising During the Period | (1,418) | 723 | 565
Amortization of Net Retirement Plan |  |  | (111)
Net-of-Tax Amount |  |  |
Net Unrealized Securities Holding Gains Arising During the Period | 4,162 | (2,116) | (940)
Amortization of Net Retirement Plan |  | 0 | 337
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) Attributable to Parent |  |  |
Before-Tax Amount |  |  |
Net Unrealized Securities Holding Gains Arising During the Period | 3,505 | (3,798) | 287
Amortization of Net Retirement Plan | 684 | 325 | 411
Tax Expense (Benefit) |  |  |
Net Unrealized Securities Holding Gains Arising During the Period | (891) | 965 | (73)
Amortization of Net Retirement Plan | (174) | (83) | (49)
Net-of-Tax Amount |  |  |
Net Unrealized Securities Holding Gains Arising During the Period | 2,614 | (2,833) | 214
Amortization of Net Retirement Plan | 510 | 242 | 362
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Including Portion Attributable to Noncontrolling Interest |  |  |
Before-Tax Amount |  |  |
Net Retirement Plan Prior Service Credit |  | (453) |
Amortization of Net Retirement Plan | 224 | 108 | (11)
Tax Expense (Benefit) |  |  |
Net Unrealized Securities Holding Gains Arising During the Period |  | 115 |
Amortization of Net Retirement Plan | (57) | (28) | 3
Net-of-Tax Amount |  |  |
Net Retirement Plan Prior Service Credit |  | (338) |
Amortization of Net Retirement Plan | $ 167 | $ 80 | $ (8)

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