Investment Securities (Gains and Losses on Sales) (Details 3) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Gain on Sale of Investments	$ 0	$ 0	$ 0	$ 12,467
Gain (Loss) on Sale of Investments	(729)	(566)	(3,097)	11,047
Loss on Sale of Investments	$ (729)	$ (566)	$ (3,097)	$ (1,420)