Fair Value (Schedule Of Assets With Fair Value Changes On Nonrecurring Basis) (Details) (USD $)	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 HTM Securities Adjusted For OTTI [Member]	Jun. 30, 2011 HTM Securities Adjusted For OTTI [Member]	Jun. 30, 2012 HTM Securities Adjusted For OTTI [Member]	Jun. 30, 2011 HTM Securities Adjusted For OTTI [Member]	Jun. 30, 2012 Impaired Loans [Member]	Jun. 30, 2011 Impaired Loans [Member]	Jun. 30, 2012 Impaired Loans [Member]	Jun. 30, 2011 Impaired Loans [Member]	Jun. 30, 2012 Other Real Estate Owned [Member]	Jun. 30, 2011 Other Real Estate Owned [Member]	Jun. 30, 2012 Other Real Estate Owned [Member]	Jun. 30, 2011 Other Real Estate Owned [Member]	Jun. 30, 2012 Level 1 [Member]	Dec. 31, 2011 Level 1 [Member]	Jun. 30, 2012 Level 1 [Member] HTM Securities Adjusted For OTTI [Member]	Dec. 31, 2011 Level 1 [Member] HTM Securities Adjusted For OTTI [Member]	Jun. 30, 2012 Level 1 [Member] Impaired Loans [Member]	Dec. 31, 2011 Level 1 [Member] Impaired Loans [Member]	Jun. 30, 2012 Level 1 [Member] Other Real Estate Owned [Member]	Dec. 31, 2011 Level 1 [Member] Other Real Estate Owned [Member]	Jun. 30, 2012 Level 2 [Member]	Dec. 31, 2011 Level 2 [Member]	Jun. 30, 2012 Level 2 [Member] HTM Securities Adjusted For OTTI [Member]	Dec. 31, 2011 Level 2 [Member] HTM Securities Adjusted For OTTI [Member]	Jun. 30, 2012 Level 2 [Member] Impaired Loans [Member]	Dec. 31, 2011 Level 2 [Member] Impaired Loans [Member]	Jun. 30, 2012 Level 2 [Member] Other Real Estate Owned [Member]	Dec. 31, 2011 Level 2 [Member] Other Real Estate Owned [Member]	Jun. 30, 2012 Level 3 [Member]	Dec. 31, 2011 Level 3 [Member]	Jun. 30, 2012 Level 3 [Member] HTM Securities Adjusted For OTTI [Member]	Dec. 31, 2011 Level 3 [Member] HTM Securities Adjusted For OTTI [Member]	Jun. 30, 2012 Level 3 [Member] Impaired Loans [Member]	Dec. 31, 2011 Level 3 [Member] Impaired Loans [Member]	Jun. 30, 2012 Level 3 [Member] Other Real Estate Owned [Member]	Dec. 31, 2011 Level 3 [Member] Other Real Estate Owned [Member]	Jun. 30, 2012 Estimated Fair Value [Member]	Dec. 31, 2011 Estimated Fair Value [Member]	Jun. 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]	Jun. 30, 2012 Estimated Fair Value [Member] Impaired Loans [Member]	Dec. 31, 2011 Estimated Fair Value [Member] Impaired Loans [Member]	Jun. 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]
Fair value of assets measured on nonrecurring basis																	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 54,558,000	$ 69,803,000	$ 0	$ 0	$ 16,060,000	$ 3,615,000	$ 38,498,000	$ 66,188,000	$ 7,940,000	$ 8,308,000	$ 7,940,000	$ 8,308,000	$ 0	$ 0	$ 0	$ 0	$ 62,498,000	$ 78,111,000	$ 7,940,000	$ 8,308,000	$ 16,060,000	$ 3,615,000	$ 38,498,000	$ 66,188,000
Gains (losses) from fair value changes	$ (7,410,000)	$ (10,473,000)	$ (15,798,000)	$ (35,888,000)	$ (341,000)	$ 0	$ (341,000)	$ 0	$ (640,000)	$ (1,719,000)	$ (3,041,000)	$ (5,473,000)	$ (6,429,000)	$ (8,754,000)	$ (12,416,000)	$ (30,415,000)