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Changes in Accumulated Other Comprehensive Income by Component - Reclassification Adjustments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Tax benefit (expense) | $ (30,504) | $ (20,515) | $ (16,386)
Net income | 98,682 | 64,581 | 83,524
Realized Gains (Losses) on Sale of Available-for-sale Securities | Amounts Reclassified from Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
(Losses) gains from the sale of available-for-sale securities | (114) | 111 | (197)
Tax benefit (expense) | 27 | (24) | 32
Net income | $ (87) | $ 87 | $ (165)

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