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Comprehensive Income Changes in Accumulated Other Comprehensive Income By Component (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Net current-period other comprehensive income (loss) |  | $ (519) |  | $ 480 |  | $ (2,959) | $ 634 |
Amounts reclassified from accumulated other comprehensive income |  |  |  |  |  |  |  | $ 0
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 |  | (4,066) | [1] | (335) | [1] | (1,250) | (382) |
Other comprehensive income or loss before reclassifications |  | (635) |  | 409 | [1] | (3,120) | 456 |
Amounts reclassified from accumulated other comprehensive income |  |  | [1] | 0 | [1] | 0 | 0 |
Net current-period other comprehensive income (loss) |  | (635) | [1] | 409 | [1] | (3,120) | 456 |
Amounts reclassified from accumulated other comprehensive income |  |  |  |  |  |  |  | (331)
Stockholders' Equity, Period End | [1] | (4,701) |  | 74 |  | (4,701) | 74 |
Amortization of Net Retirement Plan Actuarial Gain (Loss) |  |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Stockholders' Equity, Period Start |  | (6,334) | [1] | (5,628) | [1] | (6,380) | (5,737) |
Other comprehensive income or loss before reclassifications |  | 0 | [1] | 0 | [1] | 0 | 0 |
Amounts reclassified from accumulated other comprehensive income |  | 75 | [1] | 72 | [1] | 121 | 181 |
Net current-period other comprehensive income (loss) |  | 75 | [1] | 72 | [1] | 121 | 181 |
Stockholders' Equity, Period End | [1] | (6,259) |  | (5,556) |  | (6,259) | (5,556) |
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 |  | (885) | [1] | (717) | [1] | (884) | (715) |
Other comprehensive income or loss before reclassifications |  | 0 | [1] | 0 | [1] | 0 | 0 |
Amounts reclassified from accumulated other comprehensive income |  | 41 | [1] | (1) | [1] | 40 | (3) |
Net current-period other comprehensive income (loss) |  | 41 | [1] | (1) | [1] | 40 | (3) |
Stockholders' Equity, Period End | [1] | (844) |  | (718) |  | (844) | (718) |
Accumu-lated Other Com- prehensive Loss |  |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Stockholders' Equity, Period Start |  | (11,285) | [1] | (6,680) | [1] | (8,514) | (6,834) |
Other comprehensive income or loss before reclassifications |  | (635) | [1] | 409 | [1] | (3,120) | 456 |
Amounts reclassified from accumulated other comprehensive income |  | 116 | [1] | 71 | [1] | 161 | 178 |
Net current-period other comprehensive income (loss) |  | (519) | [1] | 480 | [1] | (2,959) | 634 |
Amounts reclassified from accumulated other comprehensive income |  |  |  |  |  |  |  | $ (331)
Stockholders' Equity, Period End | [1] | $ (11,804) |  | $ (6,200) |  | $ (11,804) | $ (6,200) |
[1] | All amounts are net of tax.

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