Credit Quality (Summary Of Non-performing Assets) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2011	Dec. 31, 2010
Credit Quality [Abstract]
Non-accrual loans	$ 113,416	$ 115,589
Troubled debt restructurings	12,017	19,705
Total non-performing loans	125,433	135,294
Other real estate owned (OREO)	34,640	32,702
Total non-performing loans and OREO	160,073	167,996
Non-performing investments	5,685	5,974
Total non-performing assets	$ 165,758	$ 173,970
Non-performing loans as a percent of total loans	1.85%	2.22%
Non-performing loans + OREO as a percent of total loans + OREO	2.35%	2.74%
Non-performing assets as a percent of total assets	1.67%	1.94%