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Changes in Accumulated Other Comprehensive Income by Component - Reclassification Adjustments (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Tax expense (benefit) |  |  |  |  |  |  |  |  | $ (20,515) | $ (16,386) | $ (44,739)
Net income | $ 18,895 | $ 18,344 | $ 18,186 | $ 9,156 | $ 31,552 | $ 26,086 | $ 25,814 | $ 72 | 64,581 | 83,524 | 88,226
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] |  |  |  |  |  |  |  |  |  |  |
(Gains) losses from the sale of available-for-sale securities |  |  |  |  |  |  |  |  | (111) | 197 | 11
Tax expense (benefit) |  |  |  |  |  |  |  |  | 24 | (32) | (4)
Net income |  |  |  |  |  |  |  |  | $ (87) | $ 165 | $ 7

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