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Stockholders' Equity - Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Income (Loss) Before Income Taxes | $ 2,387 |  | $ 3,407 |  | $ (11,950) | $ 4,485
Tax benefit (expense) | (1,635) |  | 588 |  | 2,733 | 280
Net Income (Loss) | 752 | $ (9,969) | 3,995 | $ 770 | (9,217) | 4,765
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Defined benefit plan adjustments – actuarial losses | (277) |  | (217) |  | (481) | (393)
Income (Loss) Before Income Taxes | 409 |  | (118) |  | (1,211) | (232)
Tax benefit (expense) | (92) |  | 41 |  | 339 | 80
Net Income (Loss) | 317 |  | (77) |  | (872) | (152)
Unrealized Gains (Losses) on Available-for-Sale Securities [Member] | Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Net investment gain (loss) | $ 686 |  | $ 99 |  | $ (730) | $ 161

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