Fair Value (Schedule Of Assets With Fair Value Changes On Nonrecurring Basis) (Details) (USD $)	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 HTM Securities Adjusted For OTTI [Member]	Sep. 30, 2011 HTM Securities Adjusted For OTTI [Member]	Sep. 30, 2012 HTM Securities Adjusted For OTTI [Member]	Sep. 30, 2011 HTM Securities Adjusted For OTTI [Member]	Sep. 30, 2012 Impaired Loans [Member]	Sep. 30, 2011 Impaired Loans [Member]	Sep. 30, 2012 Impaired Loans [Member]	Sep. 30, 2011 Impaired Loans [Member]	Sep. 30, 2012 Other Real Estate Owned [Member]	Sep. 30, 2011 Other Real Estate Owned [Member]	Sep. 30, 2012 Other Real Estate Owned [Member]	Sep. 30, 2011 Other Real Estate Owned [Member]	Sep. 30, 2012 Level 1 [Member]	Dec. 31, 2011 Level 1 [Member]	Sep. 30, 2012 Level 1 [Member] HTM Securities Adjusted For OTTI [Member]	Dec. 31, 2011 Level 1 [Member] HTM Securities Adjusted For OTTI [Member]	Sep. 30, 2012 Level 1 [Member] Impaired Loans [Member]	Dec. 31, 2011 Level 1 [Member] Impaired Loans [Member]	Sep. 30, 2012 Level 1 [Member] Other Real Estate Owned [Member]	Dec. 31, 2011 Level 1 [Member] Other Real Estate Owned [Member]	Sep. 30, 2012 Level 2 [Member]	Dec. 31, 2011 Level 2 [Member]	Sep. 30, 2012 Level 2 [Member] HTM Securities Adjusted For OTTI [Member]	Dec. 31, 2011 Level 2 [Member] HTM Securities Adjusted For OTTI [Member]	Sep. 30, 2012 Level 2 [Member] Impaired Loans [Member]	Dec. 31, 2011 Level 2 [Member] Impaired Loans [Member]	Sep. 30, 2012 Level 2 [Member] Other Real Estate Owned [Member]	Dec. 31, 2011 Level 2 [Member] Other Real Estate Owned [Member]	Sep. 30, 2012 Level 3 [Member]	Dec. 31, 2011 Level 3 [Member]	Sep. 30, 2012 Level 3 [Member] HTM Securities Adjusted For OTTI [Member]	Dec. 31, 2011 Level 3 [Member] HTM Securities Adjusted For OTTI [Member]	Sep. 30, 2012 Level 3 [Member] Impaired Loans [Member]	Dec. 31, 2011 Level 3 [Member] Impaired Loans [Member]	Sep. 30, 2012 Level 3 [Member] Other Real Estate Owned [Member]	Dec. 31, 2011 Level 3 [Member] Other Real Estate Owned [Member]	Sep. 30, 2012 Estimated Fair Value [Member]	Dec. 31, 2011 Estimated Fair Value [Member]	Sep. 30, 2012 Estimated Fair Value [Member] HTM Securities Adjusted For OTTI [Member]	Dec. 31, 2011 Estimated Fair Value [Member] HTM Securities Adjusted For OTTI [Member]	Sep. 30, 2012 Estimated Fair Value [Member] Impaired Loans [Member]	Dec. 31, 2011 Estimated Fair Value [Member] Impaired Loans [Member]	Sep. 30, 2012 Estimated Fair Value [Member] Other Real Estate Owned [Member]	Dec. 31, 2011 Estimated Fair Value [Member] Other Real Estate Owned [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Principal amount of other real estate owned property sold			$ 126,000,000	$ 217,000,000
Fair value of assets measured on nonrecurring basis																	0	0	0	0	0	0	0	0	62,737,000	59,572,000	0	0	10,570,000	3,615,000	52,167,000	55,957,000	19,912,000	8,308,000	19,912,000	8,308,000	0	0	0	0	82,649,000	67,880,000	19,912,000	8,308,000	10,570,000	3,615,000	52,167,000	55,957,000
Gains (losses) from fair value changes	$ (6,974,000)	$ (21,090,000)	$ (19,564,000)	$ (52,708,000)	$ (657,000)	$ (769,000)	$ (998,000)	$ (769,000)	$ (818,000)	$ (371,000)	$ (3,859,000)	$ (5,844,000)	$ (5,499,000)	$ (19,950,000)	$ (14,707,000)	$ (46,095,000)