Basis Of Presentation (Effect On Consolidated Condensed Balance Sheet) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2009
Allowance for loan losses	$ 120,174	$ 148,530	$ 143,575	$ 120,676	$ 119,674	$ 116,717
Net loans	4,590,339		4,589,110
Other real estate owned	47,734		41,709
Other assets	174,287		148,852
Total assets	7,322,024		7,282,261	7,093,098
Retained earnings	425,679		406,342
Total stockholders' equity	741,098		729,708
Total liabilities and stockholders' equity	7,322,024		7,282,261
As Previously Reported [Member]
Allowance for loan losses	110,187
Net loans	4,600,326
Other real estate owned	47,997
Other assets	170,699
Total assets	7,328,686
Retained earnings	432,341		422,458
Total stockholders' equity	747,760
Total liabilities and stockholders' equity	7,328,686
Effect Of Change [Member]
Allowance for loan losses	9,987
Net loans	(9,987)
Other real estate owned	(263)
Other assets	3,588
Total assets	(6,662)
Retained earnings	(6,662)		(16,116)
Total stockholders' equity	(6,662)
Total liabilities and stockholders' equity	$ (6,662)