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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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Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

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