Variable Interest Entities (Summary of the Impact of Qualifying LIHTC Investments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Low income housing tax credits [Member]
Variable Interest Entity [Line Items]
Amortization of qualifying LIHTC investments	$ 2,330	$ 2,180	$ 4,628	$ 4,360
Affordable Housing Tax Credits and Other Tax Benefits	(2,534)	(2,363)	(5,057)	(4,726)
Other tax benefits related to qualifying LIHTC investments [Member]
Variable Interest Entity [Line Items]
Affordable Housing Tax Credits and Other Tax Benefits	$ (1,069)	$ (755)	$ (2,179)	$ (1,599)