Variable Interest Entities (Summary of the Impact of Qualifying LIHTC Investments) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Low income housing tax credits [Member]
Variable Interest Entity [Line Items]
Amortization of qualifying LIHTC investments	$ 2,180,000	$ 2,470,000	$ 4,360,000	$ 4,940,000
Affordable Housing Tax Credits and Other Tax Benefits	(2,363,000)	(2,463,000)	(4,726,000)	(4,925,000)
Other tax benefits related to qualifying LIHTC investments [Member]
Variable Interest Entity [Line Items]
Affordable Housing Tax Credits and Other Tax Benefits	$ (755,000)	$ (1,864,000)	$ (1,599,000)	$ (3,719,000)