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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, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Net current-period other comprehensive income | [1] | $ 480 | $ 694 | $ 634 | $ 3,230
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 | [2] | (335) | 3,066 | (382) | 629
Other comprehensive income or loss before reclassifications |  | 409 | 682 | 456 | 3,119
Amounts reclassified from accumulated other comprehensive income |  | 0 | (88) | 0 | (88)
Net current-period other comprehensive income | [2] | 409 | 594 | 456 | 3,031
Stockholders' Equity, Period End | [2] | 74 | 3,660 | 74 | 3,660
Amortization of Net Retirement Plan Actuarial Loss |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Stockholders' Equity, Period Start | [2] | (5,628) | (7,792) | (5,737) | (7,893)
Other comprehensive income or loss before reclassifications | [2] | 0 | 0 | 0 | 0
Amounts reclassified from accumulated other comprehensive income |  | 72 | 102 | 181 | 203
Net current-period other comprehensive income | [2] | 72 | 102 | 181 | 203
Stockholders' Equity, Period End | [2] | (5,556) | (7,690) | (5,556) | (7,690)
Accretion of Net Retirement Plan Prior Service Credit |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Stockholders' Equity, Period Start | [2] | (717) | (710) | (715) | (708)
Other comprehensive income or loss before reclassifications | [2] | 0 | 0 | 0 | 0
Amounts reclassified from accumulated other comprehensive income |  | (1) | (2) | (3) | (4)
Net current-period other comprehensive income | [2] | (1) | (2) | (3) | (4)
Stockholders' Equity, Period End | [2] | (718) | (712) | (718) | (712)
AOCI Including Portion Attributable to Noncontrolling Interest |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Stockholders' Equity, Period Start | [2] | (6,680) | (5,436) | (6,834) | (7,972)
Other comprehensive income or loss before reclassifications | [2] | 409 | 682 | 456 | 3,119
Amounts reclassified from accumulated other comprehensive income | [2] | 71 | 12 | 178 | 111
Net current-period other comprehensive income | [2] | 480 | 694 | 634 | 3,230
Stockholders' Equity, Period End | [2] | $ (6,200) | $ (4,742) | $ (6,200) | $ (4,742)
[1] | These accumulated other comprehensive income components are included in the computation of net periodic pension cost.
[2] | All amounts are net of tax. Amounts in parentheses indicate debits.

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