Investment Securities (Gains And Losses, Including OTTI, Recognized In Statement Of Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Investments [Abstract]
Investment securities, Held-to-maturity, Gross gains	$ 32	$ 22	$ 63	$ 120
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities	0	657	403	998
Investment securities, Available-for-sale, Gross gains	1,551	3,026	7,989	14,955
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities	9,070	2,081	27,324	25,045
Other noninterest-bearing investments, Nonmarketable equity securities, Gross gains	4,802	3,230	9,868	22,951
Other noninterest-bearing investments, Nonmarketable equity securities, Gross losses	1,637	547	1,662	11,016
Total investment securities and other noninterest-bearing investments, Gross gains	6,385	6,278	17,920	38,026
Total investment securities and other noninterest-bearing investments, Gross losses	10,707	3,285	29,389	37,059
Net losses	(4,322)	2,993	(11,469)	967
Net impairment losses on investment securities	(9,067)	(2,736)	(23,401)	(20,253)
Equity securities gains (losses)	3,165	2,683	8,206	11,935
Fixed income securities gains (losses), net	$ 1,580	$ 3,046	$ 3,726	$ 9,285