Allowance For Credit Losses (Summary Of Allowance For Credit Losses) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Allowance For Credit Losses [Abstract]
Allowance for non-covered loans	$ 120,274	$ 118,326
Allowance for covered loans	13,528	6,378
Total allowance for loan losses	133,802	124,704	101,990
Allowance for unfunded letters of credit	2,383	1,800
Total allowance for credit losses	$ 136,185	$ 126,504