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Fair Value (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Fair Value Disclosures [Abstract] |  |  |  |
Asset transfers, level 1 to level 2 | $ 0 | $ 0 | $ 0 | $ 0
Liability transfers, level 1 to level 2 | 0 | 0 | 0 | 0
Asset transfers, level 2 to level 1 | 0 | 0 | 0 | 0
Liability transfers, level 2 to level 1 | 0 | 0 | 0 | 0
Unrealized holding gains (losses) arising during the period, pretax | 11,701,000 | (2,012,000) | 17,604,000 | (9,302,000)
Tax (expense) benefit | $ (2,714,000) | $ 471,000 | $ (4,094,000) | $ 2,174,000

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