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Changes in Accumulated Other Comprehensive Income by Component - Reclassification Adjustments (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Tax (expense) benefit | $ 2,736 | $ (1,467)
Net income | 9,156 | 72
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 | 4 | (89)
Tax (expense) benefit | 1 | (19)
Net income | $ 3 | $ (70)

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