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Comprehensive Income Changes in Accumulated Other Comprehensive Income By Component (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |
Net current-period other comprehensive income (loss) |  | $ (817) | $ 65 |  | $ (3,776) |  | $ 699 |  |
Unrealized Gains and Losses on Available for Sale Securities |  |  |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |
Stockholders' Equity, Period Start | [1] | (4,701) | 74 |  | (1,250) |  | (382) |  |
Other comprehensive income or loss before reclassifications |  | (897) | 9 | [1] | (4,017) | [1] | 465 | [1] |
Amounts reclassified from accumulated other comprehensive income | [1] |  | (6) |  | 0 |  | (6) |  |
Net current-period other comprehensive income (loss) | [1] | (897) | 3 |  | (4,017) |  | 459 |  |
Amounts reclassified from accumulated other comprehensive income | [1] |  |  |  |  |  |  |  | $ (331)
Stockholders' Equity, Period End | [1] | (5,598) | 77 |  | (5,598) |  | 77 |  |
Amortization of Net Retirement Plan Actuarial Gain (Loss) |  |  |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |
Stockholders' Equity, Period Start | [1] | (6,259) | (5,556) |  | (6,380) |  | (5,737) |  |
Other comprehensive income or loss before reclassifications | [1] | 0 | 0 |  | 0 |  | 0 |  |
Amounts reclassified from accumulated other comprehensive income | [1] | 60 | 64 |  | 181 |  | 245 |  |
Net current-period other comprehensive income (loss) | [1] | 60 | 64 |  | 181 |  | 245 |  |
Stockholders' Equity, Period End | [1] | (6,199) | (5,492) |  | (6,199) |  | (5,492) |  |
Accretion of Net Retirement Plan Prior Service (Cost) Credit |  |  |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |
Stockholders' Equity, Period Start | [1] | (844) | (718) |  | (884) |  | (715) |  |
Other comprehensive income or loss before reclassifications | [1] | 0 | 0 |  | 0 |  | 0 |  |
Amounts reclassified from accumulated other comprehensive income | [1] | 20 | (2) |  | 60 |  | (5) |  |
Net current-period other comprehensive income (loss) | [1] | 20 | (2) |  | 60 |  | (5) |  |
Stockholders' Equity, Period End | [1] | (824) | (720) |  | (824) |  | (720) |  |
Accumulated Other Comprehensive Loss |  |  |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |
Stockholders' Equity, Period Start | [1] | (11,804) | (6,200) |  | (8,514) |  | (6,834) |  |
Other comprehensive income or loss before reclassifications | [1] | (897) | 9 |  | (4,017) |  | 465 |  |
Amounts reclassified from accumulated other comprehensive income | [1] | 80 | 56 |  | 241 |  | 234 |  |
Net current-period other comprehensive income (loss) | [1] | (817) | 65 |  | (3,776) |  | 699 |  |
Amounts reclassified from accumulated other comprehensive income | [1] |  |  |  |  |  |  |  | $ (331)
Stockholders' Equity, Period End | [1] | $ (12,621) | $ (6,135) |  | $ (12,621) |  | $ (6,135) |  |
[1] | All amounts are net of tax.

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