Variable Interest Entities (Summary of the Impact of Qualifying LIHTC Investments) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Low income housing tax credits [Member]
Variable Interest Entity [Line Items]
Amortization of qualifying LIHTC investments	$ 2,293,000	$ 2,470,000	$ 6,653,000	$ 7,410,000
Affordable Housing Tax Credits and Other Tax Benefits	(2,363,000)	(2,462,000)	(7,089,000)	(7,387,000)
Other tax benefits related to qualifying LIHTC investments [Member]
Variable Interest Entity [Line Items]
Affordable Housing Tax Credits and Other Tax Benefits	$ (819,000)	$ (1,859,000)	$ (2,418,000)	$ (5,578,000)