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Accumulated Other Comprehensive Income Reclassification Out Of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |
Net realized gain (loss) on investment |  | $ 333 | $ 1,340
Prior year service cost |  | 0 | 0
Unrecognized loss |  | 0 | 0
Income before Income Taxes |  | 49,661 | 39,823
Tax |  | (10,241) | (8,365)
Net income |  | 39,420 | 31,458
Reclassification Out Of Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |
Net income |  | (347) | 0
Reclassification Out Of Accumulated Other Comprehensive Income | Unrealized Gains And Losses On Available-For-Sale Securities |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |
Net realized gain (loss) on investment |  | 30 | 0
Other-than-temporary impairments |  | (482) | 0
Income before Income Taxes |  | (452) | 0
Tax |  | 105 | 0
Net income |  | (347) | 0
Reclassification Out Of Accumulated Other Comprehensive Income | Postretirement Benefits Plans |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |
Prior year service cost |  | 0 | 0
Unrecognized loss |  | 0 | 0
Income before Income Taxes | [1] | 0 | 0
Tax |  | 0 | 0
Net income |  | $ 0 | $ 0
[1] | These accumulated other comprehensive income components are not reclassified to net income in their entirety in the same reporting period. The amounts are presented within personnel expenses on the Consolidated Statements of Operations as amortized. Amortization related to postretirement benefit plans is included in the computation of net periodic pension costs, as discussed in Note 10.

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- Definition The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting. + References No definition available. + Details
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