Debt And Equity Securities (Net Unrealized Gains (Losses)) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Schedule of Trading Securities and Other Trading Assets [Line Items]
Debt securities for which an other-than-temporary impairment has been recognized	$ (5,873)	$ (10,937)
Net unrealized gains (losses), Total	17,813	(13,556)
Debt Securities With OTTI [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Net unrealized gains (losses)	38,083	45,268
Equity Securities With OTTI [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Net unrealized gains (losses)	$ (14,397)	$ (47,887)