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Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Before-Tax Amount |  |  |  |  |
Net unrealized gains |  | $ 3,433 | $ 8,456 | $ 5,806 | $ 29,552
Tax (Expense) Benefit |  |  |  |  |
Net unrealized gains |  | (1,373) | (3,382) | (2,321) | (11,818)
Net of Tax |  |  |  |  |
Net current-period other comprehensive income |  | 2,060 | 5,074 | 3,485 | 17,734
Available-for-sale securities: |  |  |  |  |
Before-Tax Amount |  |  |  |  |
Change in net unrealized gain/loss during the period |  | 3,051 | 8,362 | 5,044 | 29,317
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income |  | 0 | (240) | 0 | (472)
Net unrealized gains |  | 3,051 | 8,122 | 5,044 | 28,845
Tax (Expense) Benefit |  |  |  |  |
Change in net unrealized gain/loss during the period |  | (1,220) | (3,344) | (2,016) | (11,724)
Reclassification adjustment for net realized gain on sale included in available-for-sale securities |  | 0 | 96 | 0 | 189
Net unrealized gains |  | (1,220) | (3,248) | (2,016) | (11,535)
Net of Tax |  |  |  |  |
Change in net unrealized gain/loss during the period |  | 1,831 | 5,018 | 3,028 | 17,593
Reclassification adjustment for net realized gain on sale included in available-for-sale securities |  | 0 | (144) | 0 | (283)
Net current-period other comprehensive income |  | 1,831 | 4,874 | 3,028 | 17,310
Plan actuarial loss |  |  |  |  |
Before-Tax Amount |  |  |  |  |
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income | [1],[2] | 397 | 326 | 754 | 669
Tax (Expense) Benefit |  |  |  |  |
Reclassification adjustment for net realized gain on sale included in available-for-sale securities |  | (159) | (131) | (302) | (268)
Net of Tax |  |  |  |  |
Reclassification adjustment for net realized gain on sale included in available-for-sale securities |  | 238 | 195 | 452 | 401
Net retirement plan prior service (cost) credit |  |  |  |  |
Before-Tax Amount |  |  |  |  |
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income | [1],[2] | (15) | 8 | 8 | 38
Tax (Expense) Benefit |  |  |  |  |
Reclassification adjustment for net realized gain on sale included in available-for-sale securities |  | 6 | (3) | (3) | (15)
Net of Tax |  |  |  |  |
Reclassification adjustment for net realized gain on sale included in available-for-sale securities |  | (9) | 5 | 5 | 23
Employee benefit plans |  |  |  |  |
Before-Tax Amount |  |  |  |  |
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income | [1] | 382 | 334 | 762 | 707
Net unrealized gains |  | 382 | 334 | 762 | 707
Tax (Expense) Benefit |  |  |  |  |
Reclassification adjustment for net realized gain on sale included in available-for-sale securities | [1] | (153) | (134) | (305) | (283)
Net unrealized gains |  | (153) | (134) | (305) | (283)
Net of Tax |  |  |  |  |
Change in net unrealized gain/loss during the period |  | 0 | 0 | 0 | 0
Reclassification adjustment for net realized gain on sale included in available-for-sale securities | [1] | 229 | 200 | 457 | 424
Net current-period other comprehensive income |  | $ 229 | $ 200 | $ 457 | $ 424
[1] | Amounts in parentheses indicated debits in income statement.
[2] | The accumulated other comprehensive (loss) income components are included in the computation of net periodic benefit cost (See Note 10 - “Employee Benefit Plan”).

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