Fair Value Measurements, Level 3 Valuations (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2018
Reconciliation of level 3 fair value category measured at fair value on a recurring basis [Roll Forward]
Balance at Beginning of Period	$ 4,643	$ 4,839
Purchases/Additions	299	778
Sales/Reductions	643	1,318
Net Realized Gains (Losses)	0	0	$ 0
Net Unrealized Gains (Losses)	0	0
Balance at End of Period	4,299	4,299
Available-for-Sale Debt Securities [Member]
Reconciliation of level 3 fair value category measured at fair value on a recurring basis [Roll Forward]
Balance at Beginning of Period	1,397	1,593
Purchases/Additions	219	698
Sales/Reductions	453	1,128
Net Realized Gains (Losses)	0	0
Net Unrealized Gains (Losses)	0	0
Balance at End of Period	1,163	1,163
Equity Securities [Member]
Reconciliation of level 3 fair value category measured at fair value on a recurring basis [Roll Forward]
Balance at Beginning of Period	3,246	3,246
Purchases/Additions	80	80
Sales/Reductions	190	190
Net Realized Gains (Losses)	0	0
Net Unrealized Gains (Losses)	0	0
Balance at End of Period	$ 3,136	$ 3,136