Other Income And Other Expense (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Other Income And Other Expense [Abstract]
Bankcard income	$ 5,615		$ 4,720
Bank-owned life insurance	4,772		4,815
Other service charges	3,293		2,853
Deferred compensation	3,119	[1]	979	[1]
ATM interchange fees	2,556		3,535
Electronic banking fees	1,706		1,534
Letter of credit fees	1,334		1,776
Gains on extinguishment of debt			5,761
Other	5,821		4,298
Total	28,216		30,271
Low income housing expense	4,608		4,697
Advertising and public relations	4,250		3,790
Other insurance and taxes	3,199		3,467
Travel and entertainment	1,864		1,770
Employee training and dues	1,092		1,247
Supplies	1,033		963
Customer relations	855		1,270
Bank examinations costs	799		1,118
Loan insurance expense	589		781
Federal service fees	321		464
Losses from litigation and regulatory matters	153		2,325
Other	5,703		5,691
Total	$ 24,466		$ 27,583

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