Investment Securities (Gains And Losses, Including OTTI, Recognized In Statement Of Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Investments [Abstract]
Investment securities, Held-to-maturity, Gross gains	$ 49	$ 71	$ 98	$ 117
Investment securities Held-to-maturity, Gross losses	341	0	341	0
Investment securities, Available-for-sale, Gross gains	5,470	4,063	11,929	7,582
Investment securities, Available-for-sale, Gross losses	6,967	11,688	22,964	18,417
Other noninterest-bearing investments, Nonmarketable equity securities, Gross gains	10,518	0	19,721	1,068
Other noninterest-bearing investments, Nonmarketable equity securities, Gross losses	10,411	1,636	10,469	1,807
Total investment securities and other noninterest-bearing investments, Gross gains	16,037	4,134	31,748	8,767
Total investment securities and other noninterest-bearing investments, Gross losses	17,719	13,324	33,774	20,224
Net losses	(1,682)	(9,190)	(2,026)	(11,457)
Net impairment losses on investment securities	(7,308)	(5,158)	(17,517)	(8,263)
Equity securities gains (losses)	107	(1,636)	9,252	(739)
Fixed income securities gains (losses), net	$ 5,519	$ (2,396)	$ 6,239	$ (2,455)