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Basis of Accounting and Consolidation - Schedule of Amounts Reclassified from Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Realized gains on available-for-sale securities | $ 3,383 | $ 33 | $ 124
Income tax expense | (19,470) | (18,340) | (15,298)
Total reclassifications out of accumulated other comprehensive income | 2,402 | 23 | 88
Accumulated Defined Benefit Plans Adjustment Attributable to Parent |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Realized gains on available-for-sale securities | 3,383 | 33 | 124
Income tax expense | $ (981) | $ (10) | $ (36)

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