Other Income And Other Expense (Details) (USD $)	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
All other income and commissions:
ATM interchange fees	$ 2,739,000		$ 2,680,000		$ 7,982,000		$ 7,691,000
Electronic banking fees	1,560,000		1,607,000		4,629,000		4,754,000
Letter of credit fees	917,000		1,171,000		3,753,000		3,866,000
Gain/(loss) on extinguishment of debt	0		0		(4,350,000)	[1]	0
Deferred compensation	(41,000)	[2]	2,160,000	[2]	1,800,000	[2]	3,475,000	[2]
Other	3,971,000		3,996,000		9,461,000		11,230,000
Total	9,146,000		11,614,000		23,275,000		31,016,000
All other expense:
Litigation and regulatory matters	35,390,000		229,000		(2,720,000)		6,299,000
Other insurance and taxes	3,909,000		3,215,000		10,178,000		9,337,000
Tax credit investments	2,481,000		3,079,000		8,008,000		9,040,000
Travel and entertainment	2,164,000		2,400,000		6,633,000		6,620,000
Customer relations	1,406,000		1,204,000		4,329,000		3,737,000
Employee training and dues	1,194,000		1,244,000		3,260,000		3,727,000
Supplies	779,000		950,000		2,699,000		2,710,000
Miscellaneous loan costs	597,000		1,349,000		2,150,000		3,508,000
Other	13,709,000		8,961,000		31,856,000		23,775,000
Total	$ 61,629,000		$ 22,631,000		$ 66,393,000		$ 68,753,000

[1] Nine months ended September 30, 2014 loss is associated with the collapse of two HELOC securitization trusts.

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