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Basis of Accounting and Consolidation - Schedule of Amounts Reclassified from Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Realized gains on available-for-sale securities | $ 4 | $ 531
Tax effect | (668) | (3,172)
Total reclassifications out of accumulated other comprehensive income | 3 | 377
Accumulated Defined Benefit Plans Adjustment Attributable to Parent |  |
Realized gains on available-for-sale securities | 4 | 531
Tax effect | $ (1) | $ (154)

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