Investment Securities (Gains And Losses, Including OTTI, Recognized In Statement Of Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Investments [Abstract]
Investment securities, Held-to-maturity, Gross gains	$ 0	$ 0	$ 1	$ 0
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities	0	0	0	27
Investment securities, Available-for-sale, Gross gains	7,402	5,032	8,360	77,593
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities	146,315	1,238	147,513	42,885
Other noninterest-bearing investments, Nonmarketable equity securities, Gross gains	6,008	3,745	9,603	4,657
Other noninterest-bearing investments, Nonmarketable equity securities, Gross losses	692	0	934	0
Total investment securities and other noninterest-bearing investments, Gross gains	13,410	8,777	17,964	82,250
Total investment securities and other noninterest-bearing investments, Gross losses	147,007	1,238	148,447	42,912
Net losses	(133,597)	7,539	(130,483)	39,338
Net impairment losses on investment securities	0	0	0	(27)
Equity securities gains (losses)	4,839	2,513	8,192	3,425
Fixed income securities gains (losses), net	$ (138,436)	$ 5,026	$ (138,675)	$ 35,940