Investment Securities (Schedule of Available-for-Sale Investment Securities Gross Gains and Gross Losses Realized) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]
Realized gains									$ 658	$ 405	$ 434
Realized losses									(335)	(909)	(106)
Net realized gains									323	(504)	328
Other than temporary impairment charges									0	0	(3,328)
Gains (losses) on available-for-sale securities, net	$ (79)	$ (98)	$ (24)	$ 524	$ 18	$ (153)	$ (336)	$ (33)	323	(504)	(3,000)
Proceeds from sales of available-for-sale securities, net									$ 1,515,559	$ 852,330	$ 138,274