Commitments and Contingent Liabilities Variable Interests (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Variable Interest Entity, Primary Beneficiary [Member] | Loans VIE [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	$ 10,000	$ 0
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	0	0
Variable Interest Entity, Primary Beneficiary [Member] | Loans VIE [Member] | Private Equity Funds Variable Interest Entities [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	0	0
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities		0
Variable Interest Entity, Primary Beneficiary [Member] | Loans VIE [Member] | Tax Credit Variable Interest Entities [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	10,000	0
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities		0
Variable Interest Entity, Primary Beneficiary [Member] | Loans VIE [Member] | Other Variable Interest Entities [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	0	0
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities		0
Variable Interest Entity, Primary Beneficiary [Member] | Other Assets VIE [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	52,591	52,591
Variable Interest Entity, Primary Beneficiary [Member] | Other Assets VIE [Member] | Private Equity Funds Variable Interest Entities [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	30,902	25,436
Variable Interest Entity, Primary Beneficiary [Member] | Other Assets VIE [Member] | Tax Credit Variable Interest Entities [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	14,483	0
Variable Interest Entity, Primary Beneficiary [Member] | Other Assets VIE [Member] | Other Variable Interest Entities [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	7,206	7,516
Variable Interest Entity, Primary Beneficiary [Member] | Other Liabilities VIE [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	0	0
Variable Interest Entity, Primary Beneficiary [Member] | Other Liabilities VIE [Member] | Private Equity Funds Variable Interest Entities [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	0	0
Variable Interest Entity, Primary Beneficiary [Member] | Other Liabilities VIE [Member] | Tax Credit Variable Interest Entities [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	0	0
Variable Interest Entity, Primary Beneficiary [Member] | Other Liabilities VIE [Member] | Other Variable Interest Entities [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	0	0
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities [Abstract]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities	2,194	2,974
Variable Interest Entity, Primary Beneficiary [Member] | Other Borrowings VIE [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	10,964	0
Variable Interest Entity, Primary Beneficiary [Member] | Other Borrowings VIE [Member] | Private Equity Funds Variable Interest Entities [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	0	0
Variable Interest Entity, Primary Beneficiary [Member] | Other Borrowings VIE [Member] | Tax Credit Variable Interest Entities [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	10,964	0
Variable Interest Entity, Primary Beneficiary [Member] | Other Borrowings VIE [Member] | Other Variable Interest Entities [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	0	0
Variable Interest Entity, Primary Beneficiary [Member] | Non Controlling Interest VIE [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	36,184	22,152
Variable Interest Entity, Primary Beneficiary [Member] | Non Controlling Interest VIE [Member] | Private Equity Funds Variable Interest Entities [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	26,042	21,957
Variable Interest Entity, Primary Beneficiary [Member] | Non Controlling Interest VIE [Member] | Tax Credit Variable Interest Entities [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	10,000	0
Variable Interest Entity, Primary Beneficiary [Member] | Non Controlling Interest VIE [Member] | Other Variable Interest Entities [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	142	195
Variable Interest Entity, Not Primary Beneficiary [Member] | Loans VIE [Member]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities [Abstract]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	0	0
Variable Interest Entity, Not Primary Beneficiary [Member] | Loans VIE [Member] | Private Equity Funds Variable Interest Entities [Member]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities [Abstract]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities		0
Variable Interest Entity, Not Primary Beneficiary [Member] | Loans VIE [Member] | Tax Credit Variable Interest Entities [Member]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities [Abstract]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	0
Variable Interest Entity, Not Primary Beneficiary [Member] | Loans VIE [Member] | Other Variable Interest Entities [Member]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities [Abstract]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	0	0
Variable Interest Entity, Not Primary Beneficiary [Member] | Other Assets VIE [Member]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities [Abstract]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	48,840	38,460
Variable Interest Entity, Not Primary Beneficiary [Member] | Other Assets VIE [Member] | Tax Credit Variable Interest Entities [Member]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities [Abstract]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	37,890	28,580
Variable Interest Entity, Not Primary Beneficiary [Member] | Other Assets VIE [Member] | Other Variable Interest Entities [Member]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities [Abstract]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	10,950	9,880
Variable Interest Entity, Not Primary Beneficiary [Member] | Other Liabilities VIE [Member]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities [Abstract]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities	18,278	18,642
Variable Interest Entity, Not Primary Beneficiary [Member] | Other Liabilities VIE [Member] | Tax Credit Variable Interest Entities [Member]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities [Abstract]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities	16,084	15,668
Variable Interest Entity, Not Primary Beneficiary [Member] | Other Borrowings VIE [Member]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities [Abstract]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities	0	0
Variable Interest Entity, Not Primary Beneficiary [Member] | Other Borrowings VIE [Member] | Tax Credit Variable Interest Entities [Member]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities [Abstract]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities	0	0
Variable Interest Entity, Not Primary Beneficiary [Member] | Other Borrowings VIE [Member] | Other Variable Interest Entities [Member]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities [Abstract]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities	0	0
Variable Interest Entity, Not Primary Beneficiary [Member] | Non Controlling Interest VIE [Member]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities [Abstract]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities	0	0
Variable Interest Entity, Not Primary Beneficiary [Member] | Non Controlling Interest VIE [Member] | Tax Credit Variable Interest Entities [Member]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities [Abstract]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities	0	0
Variable Interest Entity, Not Primary Beneficiary [Member] | Non Controlling Interest VIE [Member] | Other Variable Interest Entities [Member]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities [Abstract]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities	$ 0	$ 0