Commitments and Contingent Liabilities Variable Interest Entities (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Loans VIE [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	$ 10,000	$ 10,000	$ 0
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	0	0	0
Other Assets VIE [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	52,747	52,591	39,289
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	80,596	48,840	43,321
Other Liabilities VIE [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	0	0	0
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	41,453	18,278	17,980
Other Borrowings VIE [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	10,964	10,964	0
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	0	0	0
Non Controlling Interest VIE [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	36,787	36,185	24,456
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	0	0	0
Private Equity Funds Variable Interest Entities [Member] | Loans VIE [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	0	0	0
Private Equity Funds Variable Interest Entities [Member] | Other Assets VIE [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	31,492	30,902	30,991
Private Equity Funds Variable Interest Entities [Member] | Other Liabilities VIE [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	0	0	0
Private Equity Funds Variable Interest Entities [Member] | Other Borrowings VIE [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	0	0	0
Private Equity Funds Variable Interest Entities [Member] | Non Controlling Interest VIE [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	26,648	26,042	24,264
Tax Credit Variable Interest Entities [Member] | Loans VIE [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	10,000	10,000	0
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	0	0	0
Tax Credit Variable Interest Entities [Member] | Other Assets VIE [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	14,224	14,483	0
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	71,298	37,890	25,684
Tax Credit Variable Interest Entities [Member] | Other Liabilities VIE [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	0	0	0
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	39,510	16,084	14,464
Tax Credit Variable Interest Entities [Member] | Other Borrowings VIE [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	10,964	10,964	0
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	0	0	0
Tax Credit Variable Interest Entities [Member] | Non Controlling Interest VIE [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	10,000	10,000	0
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	0	0	0
Other Variable Interest Entities [Member] | Loans VIE [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	0	0	0
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	0	0	0
Other Variable Interest Entities [Member] | Other Assets VIE [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	7,031	7,206	8,298
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	9,298	10,950	17,637
Other Variable Interest Entities [Member] | Other Liabilities VIE [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	0	0	0
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	1,943	2,194	3,516
Other Variable Interest Entities [Member] | Other Borrowings VIE [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	0	0	0
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	0	0	0
Other Variable Interest Entities [Member] | Non Controlling Interest VIE [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	139	143	192
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	$ 0	$ 0	$ 0