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Comprehensive Income Changes in Accumulated Other Comprehensive Income By Component (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Net current-period other comprehensive income | [1] | $ 154 |  | $ 2,536 |
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] | (382) |  | 629 |
Other comprehensive income or loss before reclassifications |  | 47 |  | 2,437 |
Amounts reclassified from accumulated other comprehensive income |  | 0 | [1] | 0 | [2]
Net current-period other comprehensive income | [2] | 47 |  | 2,437 |
Stockholders' Equity, Period End | [2] | (335) |  | 3,066 |
Amortization of Net Retirement Plan Actuarial Loss |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Stockholders' Equity, Period Start | [2] | (5,737) |  | (7,893) |
Other comprehensive income or loss before reclassifications | [2] | 0 |  | 0 |
Amounts reclassified from accumulated other comprehensive income |  | 109 |  | 101 |
Net current-period other comprehensive income | [2] | 109 |  | 101 |
Stockholders' Equity, Period End | [2] | (5,628) |  | (7,792) |
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] | (715) |  | (708) |
Other comprehensive income or loss before reclassifications | [2] | 0 |  | 0 |
Amounts reclassified from accumulated other comprehensive income |  | (2) |  | (2) |
Net current-period other comprehensive income | [2] | (2) |  | (2) |
Stockholders' Equity, Period End | [2] | (717) |  | (710) |
AOCI Including Portion Attributable to Noncontrolling Interest |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Stockholders' Equity, Period Start | [2] | (6,834) |  | (7,972) |
Other comprehensive income or loss before reclassifications | [2] | 47 |  | 2,437 |
Amounts reclassified from accumulated other comprehensive income | [2] | 107 |  | 99 |
Net current-period other comprehensive income | [2] | 154 |  | 2,536 |
Stockholders' Equity, Period End | [2] | $ (6,680) |  | $ (5,436) |
[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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