Variable Interest Entities (Summary of the Impact of Qualifying LIHTC Investments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Low income housing tax credits [Member]
Variable Interest Entity [Line Items]
Amortization of qualifying LIHTC investments	$ 5,445	$ 2,293	$ 10,073	$ 6,653
Affordable Housing Tax Credits and Other Tax Benefits	(2,615)	(2,363)	(7,672)	(7,089)
Other tax benefits related to qualifying LIHTC investments [Member]
Variable Interest Entity [Line Items]
Affordable Housing Tax Credits and Other Tax Benefits	$ (6,131)	$ (819)	$ (8,310)	$ (2,418)