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Comprehensive Income (Loss), Net of Tax - Reclassification Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Total before tax | $ 47,075 | $ 45,305 | $ 39,855
Provision for Income Taxes | (9,600) | (9,026) | (10,529)
Net of tax | (677) | (322) | (691)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Loss on Securities Transactions, Net | 0 | 0 | (448)
Total before tax | 0 | 0 | (448)
Provision for Income Taxes | 0 | 0 | 111
Net of tax | 0 | 0 | (337)
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Prior-service costs | (224) | (108) | 11
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) Attributable to Parent | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Prior-service costs | (684) | (325) | (411)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Provision for Income Taxes | 231 | 111 | 46
Net of tax | (677) | (322) | (354)
Actuarial gains/(losses) | $ (908) | $ (433) | $ (400)

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