Investment Securities Summary of Gains and Losses from Equity and Debt Securities, and Losses from Other-than-Temporary Impairment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Gain (Loss) on Investments [Line Items]
Gross Realized Gains	$ 2	$ 1,730	$ 1,061	$ 8,290
Gross Realized Losses	0	0	(36)	0
Net Gains (Losses)	2	1,730	1,025	8,290
Equity Securities [Member]
Gain (Loss) on Investments [Line Items]
Gross Realized Gains	2	1,730	739	5,990
Gross Realized Losses	0	0	(10)	0
Net Gains (Losses)	2	1,730	729	5,990
Debt Securities [Member]
Gain (Loss) on Investments [Line Items]
Gross Realized Gains	0	0	322	2,300
Gross Realized Losses	0	0	(26)	0
Net Gains (Losses)	$ 0	$ 0	$ 296	$ 2,300