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Comprehensive Income Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Schedule of Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax |  | $ 0 | $ 6 |  | $ 0 |  | $ 6 | [1]
Other Comprehensive Income, before Tax |  | (1,095) | 172 |  | (5,063) |  | 1,268 |
Other Comprehensive Income, Tax |  | 278 | (107) |  | 1,287 |  | (569) |
Net current-period other comprehensive income (loss) |  | (817) | 65 |  | (3,776) |  | 699 |
Unrealized Gains and Losses on Available for Sale Securities |  |  |  |  |  |  |  |
Schedule of Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Net Unrealized Securities Holding Losses on Securities Available-for-Sale Arising During the Period Before Tax |  | (1,203) | 6 |  | (5,388) |  | 749 |
Net Unrealized Securities Holding Losses on Securities Available-for-Sale Arising During the Period, Tax |  | 306 | 3 |  | 1,371 |  | (284) |
Other comprehensive income or loss before reclassifications |  | (897) | 9 | [1] | (4,017) | [1] | 465 | [1]
Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax |  |  | 10 |  |  |  | 10 |
Reclassification From Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit |  |  | (4) |  |  |  | (4) |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax |  |  | (6) |  |  |  | (6) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | [1] |  | (6) |  | 0 |  | (6) |
Net current-period other comprehensive income (loss) | [1] | (897) | 3 |  | (4,017) |  | 459 |
Amortization of Net Retirement Plan Actuarial Gain (Loss) |  |  |  |  |  |  |  |
Schedule of Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Other comprehensive income or loss before reclassifications | [1] | 0 | 0 |  | 0 |  | 0 |
Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax |  | 81 | 179 |  | 244 |  | 537 |
Reclassification from Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit |  | (21) | (115) |  | (63) |  | (292) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | [1] | 60 | 64 |  | 181 |  | 245 |
Net current-period other comprehensive income (loss) | [1] | 60 | 64 |  | 181 |  | 245 |
Accumulated Defined Benefit Plans Adjustment, Net Prior Service |  |  |  |  |  |  |  |
Schedule of Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax |  | 27 | (3) |  | 81 |  | (8) |
Reclassification from Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit |  | (7) | 1 |  | (21) |  | 3 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  | $ 20 | $ (2) |  | $ 60 |  | $ (5) |
[1] | All amounts are net of tax.

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