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Changes in Accumulated Other Comprehensive Income by Component - Reclassification Adjustments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Tax (expense) benefit | $ (5,431) |  | $ (7,502) |  | $ (8,167) | $ (6,035)
Net income | 18,186 | $ 9,156 | 25,814 | $ 72 | 27,342 | 25,886
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 | 99 |  | (67) |  | 103 | (156)
Tax (expense) benefit | (23) |  | 11 |  | (24) | 30
Net income | $ 76 |  | $ (56) |  | $ 79 | $ (126)

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