Other Income And Other Expense (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Other Income And Other Expense [Abstract]
Bankcard income	$ 5,298		$ 5,258		$ 16,618		$ 15,129
Bank-owned life insurance	4,293		5,116		13,724		14,851
Other service charges	3,263		2,969		9,768		8,641
Deferred compensation	1,966	[1]	(2,093)	[1]	4,065	[1]	(893)	[1]
ATM interchange fees	2,579		3,709		7,804		11,035
Electronic banking fees	1,589		1,609		4,927		4,679
Letter of credit fees	1,072		1,407		3,966		5,052
Gains on extinguishment of debt			0		0		5,761
Other	6,280		3,340		16,535		15,066
Tax credit investments	5,635		4,712		14,457		14,382
Advertising and public relations	4,121		4,571		11,524		11,919
Other insurance and taxes	1,327		3,352		7,656		10,326
Travel and entertainment	2,009		2,075		6,308		5,982
Employee training and dues	1,032		1,009		3,354		3,598
Supplies	881		1,092		2,731		2,847
Customer relations	1,027		1,185		3,230		3,607
Bank examinations costs	816		1,138		2,415		3,373
Loan insurance expense	578		744		1,803		2,231
Federal service fees	323		338		972		1,093
Losses from litigation and regulatory matters	6,760		0		29,013		40,585
Other	$ 5,478		$ 3,706		$ 25,108		$ 26,302

[1] Deferred compensation market value adjustments are mirrored by adjustments to employee compensation, incentives, and benefits expense.