Derivative Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2011 Y
Gross notional values of derivatives used in companies Asset and Liability Management
Fair Value Hedge	$ 1,621,912
Cash Flow Hedge	7,095,000
Notional Amount of Derivatives, Total	8,716,912
Additional information about the interest rate swaps used in companies Asset and Liability Management
Notional Value	8,716,912
Average Maturity (years)	2.2
Fair Value	195,962
Weighted-Average Rate Receive	1.68%
Weighted-Average Rate Pay	0.55%
Loan [Member]
Gross notional values of derivatives used in companies Asset and Liability Management
Fair Value Hedge	0
Cash Flow Hedge	7,045,000
Notional Amount of Derivatives, Total	7,045,000
Investment securities [Member]
Gross notional values of derivatives used in companies Asset and Liability Management
Fair Value Hedge	0
Cash Flow Hedge	50,000
Notional Amount of Derivatives, Total	50,000
Deposits [Member]
Gross notional values of derivatives used in companies Asset and Liability Management
Fair Value Hedge	988,912
Cash Flow Hedge	0
Notional Amount of Derivatives, Total	988,912
Subordinated notes
Gross notional values of derivatives used in companies Asset and Liability Management
Fair Value Hedge	598,000
Cash Flow Hedge	0
Notional Amount of Derivatives, Total	598,000
Other long-term debt
Gross notional values of derivatives used in companies Asset and Liability Management
Fair Value Hedge	35,000
Cash Flow Hedge	0
Notional Amount of Derivatives, Total	35,000
Asset conversion swaps - Receive Fixed - Generic [Member]
Additional information about the interest rate swaps used in companies Asset and Liability Management
Notional Value	7,095,000
Average Maturity (years)	1.9
Fair Value	80,447
Weighted-Average Rate Receive	1.49%
Weighted-Average Rate Pay	0.59%
Liability conversion swaps - Receive Fixed - Generic [Member]
Additional information about the interest rate swaps used in companies Asset and Liability Management
Notional Value	1,591,912
Average Maturity (years)	3.8
Fair Value	115,090
Weighted-Average Rate Receive	2.53%
Weighted-Average Rate Pay	0.36%
Liability Conversion Swaps - Receive Fixed - Callable
Additional information about the interest rate swaps used in companies Asset and Liability Management
Notional Value	30,000
Average Maturity (years)	9.0
Fair Value	$ 425
Weighted-Average Rate Receive	2.98%
Weighted-Average Rate Pay	0.00%

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Average maturity of interest rate derivative in years.

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Weighted-Average Rate Pay.

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Weighted-Average Rate receive.

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- Definition

Fair value as of the balance sheet date of interest rate derivative assets, net of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized on the balance sheet.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 107

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Aggregate notional amount of all derivatives designated as cash flow hedging instruments. The notional amount relates to a number of currency units, shares, bushels, pounds, or other units specified in a derivative instrument.

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-Name Accounting Standards Codification

-Glossary Notional Amount

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Aggregate notional amount of all derivatives. The notional amount relates to a number of currency units, shares, bushels, pounds, or other units specified in a derivative instrument.

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Aggregate notional amount of all derivatives designated as a fair value hedging instrument. The notional amount relates to a number of currency units, shares, bushels, pounds, or other units specified in a derivative instrument.

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Aggregate notional amount of interest rate derivatives, which relates to the currency amount specified in the interest rate derivative instruments.

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