Fair Value (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 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	2,210,000	(927,000)	19,814,000	(10,229,000)
Tax (expense) benefit	$ (508,000)	$ 216,000	$ (4,602,000)	$ 2,390,000