Income Taxes Income Taxes (Deferred Tax Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred tax assets:
Allowance for loan and lease losses	$ 73,344	$ 97,935
Net operating loss and credit carry forwards	66,308	66,662
Compensation and employee benefit plans	42,497	41,830
Net losses on derivative instruments	16,522	11,302
Impairment losses on securities available for sale	8,622	8,765
Nonaccrual interest	8,247	5,327
Other	9,909	15,907
Gross deferred tax assets	225,449	247,728
Valuation allowance	(82,502)	(85,445)
Total deferred tax assets, net of valuation allowance	142,947	162,283
Deferred tax liabilities:
Net unrealized gain on securities available for sale	26,143	9,890
Equipment financing leases	10,784	8,651
Deferred income on repurchase of debt	10,627	10,627
Intangible assets	7,388	6,537
Premises and equipment	6,163	5,313
Mortgage servicing rights	5,461	2,978
Deferred loan costs, net	3,236	5,078
Other	4,464	7,544
Gross deferred tax liabilities	74,266	56,618
Deferred tax asset, net	$ 68,681	$ 105,665