Other Income And Other Expense (Details) (USD $)	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Other Income And Other Expense [Abstract]
Bankcard income	$ 5,258,000		$ 4,965,000		$ 15,129,000		$ 14,785,000
Bank owned life insurance	5,116,000		5,913,000		14,851,000		18,166,000
ATM interchange fees	3,709,000		3,532,000		11,035,000		10,421,000
Other service charges	2,969,000		2,829,000		8,641,000		7,524,000
Letter of credit fees	1,407,000		1,544,000		5,052,000		4,985,000
Electronic banking fees	1,609,000		1,870,000		4,679,000		5,483,000
Deferred compensation	(2,093,000)		1,121,000		(893,000)		1,359,000
Gains on extinguishment of debt					5,761,000		17,060,000
Other	7,268,000		8,899,000		21,794,000		22,309,000
Other income, total	25,243,000		30,673,000		86,049,000		102,092,000
Loss accruals from litigation and regulatory matters			1,128,000	[1]	40,585,000	[1]	2,397,000	[1]
Low income housing expense	4,712,000		5,513,000		14,382,000		16,343,000
Advertising and public relations	4,571,000		6,508,000		11,919,000		17,153,000
Other insurance and taxes	3,352,000		2,985,000		10,326,000		9,715,000
Travel and entertainment	2,075,000		2,454,000		5,982,000		7,370,000
Employee training and dues	1,009,000		1,116,000		3,598,000		3,515,000
Customer relations	1,185,000		1,535,000		3,607,000		5,274,000
Bank examinations costs	1,138,000		1,147,000		3,373,000		3,431,000
Supplies	1,092,000		1,120,000		2,847,000		3,311,000
Loan insurance expense	744,000	[2]	903,000	[2]	2,231,000	[2]	(1,289,000)	[2]
Federal service fees	338,000		520,000		1,093,000		2,139,000
Other	3,706,000	[3]	8,745,000	[3]	26,302,000	[3]	14,467,000	[3]
Other expenses, total	23,922,000		33,674,000		126,245,000		83,826,000
Cancellation of contract, premiums returned							3,800,000
Termination of technology services contract charge					9,000,000
Loss accrual related to a litigation settlement					$ 36,700,000

[1] Nine months ended September 30, 2011 includes a $36.7 million loss accrual related to a litigation settlement. See Note 9 - Contingencies and Other Disclosures.

[2] Nine months ended September 30, 2010 includes the cancellation of an HLTV insurance contract and return of $3.8 million of premiums.

[3] Nine months ended September 30, 2011 includes $9.0 million charge to terminate technology services contract.