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Derivative Financial Instruments (Asset and liability management) (Details)

v2.4.0.6
Derivative Financial Instruments (Asset and liability management) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Y
Gross notional values of derivatives used in companies Asset and Liability Management  
Fair Value Hedge $ 1,324,875
Cash Flow Hedge 9,169,000
Notional Amount of Derivatives, Total 10,493,875
Additional information about the interest rate swaps used in companies Asset and Liability Management  
Notional Value 10,493,875
Average Maturity (years) 2.7
Fair Value 147,295
Weighted-Average Rate Receive 1.24%
Weighted-Average Rate Pay 0.45%
Asset conversion swaps - Receive Fixed - Generic [Member]
 
Additional information about the interest rate swaps used in companies Asset and Liability Management  
Notional Value 9,169,000
Average Maturity (years) 2.7
Fair Value 47,023
Weighted-Average Rate Receive 1.01%
Weighted-Average Rate Pay 0.46%
Asset Conversion Swaps Pay Fixed Generic [Member]
 
Additional information about the interest rate swaps used in companies Asset and Liability Management  
Notional Value 0
Average Maturity (years) 0.0
Fair Value 0
Weighted-Average Rate Receive 0.00%
Weighted-Average Rate Pay 0.00%
Liability conversion swaps - Receive Fixed - Generic [Member]
 
Additional information about the interest rate swaps used in companies Asset and Liability Management  
Notional Value 1,324,875
Average Maturity (years) 2.9
Fair Value 100,272
Weighted-Average Rate Receive 2.88%
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 0
Average Maturity (years) 0.0
Fair Value 0
Weighted-Average Rate Receive 0.00%
Weighted-Average Rate Pay 0.00%
Loan [Member]
 
Gross notional values of derivatives used in companies Asset and Liability Management  
Fair Value Hedge 0
Cash Flow Hedge 9,169,000
Notional Amount of Derivatives, Total 9,169,000
Investment securities [Member]
 
Gross notional values of derivatives used in companies Asset and Liability Management  
Fair Value Hedge 0
Cash Flow Hedge 0
Notional Amount of Derivatives, Total 0
Deposits [Member]
 
Gross notional values of derivatives used in companies Asset and Liability Management  
Fair Value Hedge 691,875
Cash Flow Hedge 0
Notional Amount of Derivatives, Total 691,875
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