Basis Of Presentation (Effect On Consolidated Condensed Statements Of Income) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Provision for loan losses	$ 16,438	$ 14,654	$ 43,054	$ 44,454
Net interest income after provision for loan losses	51,182	54,791	163,901	161,092
OREO devaluations	(588)		(6,478)	(4,619)
Other income	18,027	17,530	48,195	50,887
Income before income taxes	27,075	26,625	98,606	83,211
Income taxes	6,694	7,048	27,076	21,689
Net income	20,381	19,577	71,530	61,522
Net income available to common shareholders	18,917	18,125	67,138	57,167
Basic	$ 1.23	$ 1.19	$ 4.36	$ 3.79
Diluted	$ 1.23	$ 1.19	$ 4.36	$ 3.79
As Previously Reported [Member]
Provision for loan losses	18,525		55,925
Net interest income after provision for loan losses	49,095		151,030
OREO devaluations	(1,688)		(11,339)
Other income	16,927		43,334
Income before income taxes	23,888		80,874
Income taxes	5,579		20,870
Net income	18,309		60,004
Net income available to common shareholders	16,845		55,612
Basic	$ 1.09		$ 3.61
Diluted	$ 1.09		$ 3.61
Effect Of Change [Member]
Provision for loan losses	(2,087)		(12,871)
Net interest income after provision for loan losses	2,087		12,871
OREO devaluations	1,100		4,861
Other income	1,100		4,861
Income before income taxes	3,187		17,732
Income taxes	1,115		6,206
Net income	2,072		11,526
Net income available to common shareholders	$ 2,072		$ 11,526
Basic	$ 0.14		$ 0.75
Diluted	$ 0.14		$ 0.75