Allowance For Credit Losses (Summary Of Provision For Credit Losses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Allowance For Credit Losses [Abstract]
Provision for non-covered loans									$ 31,242	$ 42,943
Provision for covered loans									21,510	6,378
Total provision for loan losses									52,752	49,321
Provision for unfunded letters of credit									583	135
Total provision for credit losses	$ 15,364	$ 7,783	$ 6,026	$ 24,162	$ 15,099	$ 9,308	$ 12,438	$ 12,611	$ 53,335	$ 49,456	$ 47,992