Derivative Financial Instruments Fair Values of Derivatives by Balance Sheet Location (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional Amount of Cash Flow Hedge Instruments	$ 1,003,000	$ 1,153,000
Asset Derivatives, Fair Value, Gross Asset	0	0
Liability Derivatives, Fair Value, Gross Liability	146,541	133,897
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount		18,000
Asset Derivatives, Fair Value, Gross Asset		0
Liability Derivatives, Fair Value, Gross Liability		831
Interest Rate Lock Commitments [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	2,154,183	828,866
Asset Derivatives, Fair Value, Gross Asset	16,661	8,059
Liability Derivatives, Fair Value, Gross Liability	1,505	126
Forward Sales Commitments [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	2,602,404	1,278,899
Asset Derivatives, Fair Value, Gross Asset	3,272	1,140
Liability Derivatives, Fair Value, Gross Liability	19,581	13,340
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	1,005,432	1,114,838
Asset Derivatives, Fair Value, Gross Asset	11,987	9,494
Liability Derivatives, Fair Value, Gross Liability	7,924	16,293
Equity, Foreign Currency, Commodity and Metals Indexed Options [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	215,325	220,465
Asset Derivatives, Fair Value, Gross Asset	17,533	20,460
Liability Derivatives, Fair Value, Gross Liability	0	0
Options Embedded in Customer Deposits [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	214,623	218,514
Asset Derivatives, Fair Value, Gross Asset	0	0
Liability Derivatives, Fair Value, Gross Liability	17,379	20,192
Indemnification Asset [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	369,215	482,094
Asset Derivatives, Fair Value, Gross Asset	9,383	8,540
Liability Derivatives, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value, Gross Asset	58,836	47,693
Liability Derivatives, Fair Value, Gross Liability	46,389	50,782
Derivative [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value, Gross Asset	58,836	47,693
Liability Derivatives, Fair Value, Gross Liability	$ 192,930	$ 184,679