Other Income And Other Expense (Details) - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
All other income and commissions:
Gains/(loss) on extinguishment of debt		$ 5,794,000	$ 0	$ 5,794,000	$ (4,350,000)
ATM interchange fees		2,998,000	2,739,000	8,784,000	7,982,000
Electronic banking fees		1,479,000	1,560,000	4,366,000	4,629,000
Letter of credit fees		978,000	917,000	3,633,000	3,753,000
Deferred compensation	[1]	(2,309,000)	(41,000)	(1,311,000)	1,800,000
Other		3,550,000	3,971,000	13,096,000	9,461,000
Total		12,490,000	9,146,000	34,362,000	23,275,000
All other expense:
Litigation and regulatory matters		10,922,000	35,390,000	173,422,000	(2,720,000)
Other insurance and taxes		3,283,000	3,909,000	10,067,000	10,178,000
Travel and entertainment		2,451,000	2,164,000	6,697,000	6,633,000
Customer relations		1,477,000	1,406,000	4,296,000	4,329,000
Employee training and dues		1,272,000	1,194,000	3,853,000	3,260,000
Supplies		974,000	779,000	2,781,000	2,699,000
Miscellaneous loan costs		726,000	597,000	1,821,000	2,150,000
Tax credit investments		439,000	311,000	1,383,000	1,498,000
Other		8,835,000	13,709,000	26,565,000	31,856,000
Total		$ 30,379,000	$ 59,459,000	$ 230,885,000	$ 59,883,000

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