Basis Of Presentation (Effect On Consolidated Condensed Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2011	Jun. 30, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Dec. 31, 2009
Allowance for loan losses	$ 107,310	$ 120,174	$ 143,575	$ 117,405	$ 120,676	$ 116,717
Net loans	4,573,265		4,589,110
Other assets	163,973		148,852
Total assets	7,095,098		7,282,261	7,090,456
Retained earnings	430,121		406,342
Total stockholders' equity	755,053		729,708
Total liabilities and stockholders' equity	7,095,098		7,282,261
As Previously Reported [Member]
Allowance for loan losses	100,248
Net loans	4,580,327
Other assets	161,501
Total assets	7,099,688
Retained earnings	434,711		422,458
Total stockholders' equity	759,643
Total liabilities and stockholders' equity	7,099,688
Effect Of Change [Member]
Allowance for loan losses	7,062
Net loans	(7,062)
Other assets	2,472
Total assets	(4,590)
Retained earnings	(4,590)		(16,116)
Total stockholders' equity	(4,590)
Total liabilities and stockholders' equity	$ (4,590)