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

v3.2.0.727
Derivative Financial Instruments (Asset and liability management) (Details Add Info) - Jun. 30, 2015
$ in Thousands
USD ($)
Y
Additional information about the interest rate swaps used in companies Asset and Liability Management  
Notional Amount Of Interest Rate Derivatives $ 13,827,600
Average Maturity (years) | Y 1.9
Fair Value $ 75,100
Weighted-Average Rate Receive 1.07%
Weighted-Average Rate Pay 0.27%
Asset conversion swaps - Receive Fixed - Generic [Member]  
Additional information about the interest rate swaps used in companies Asset and Liability Management  
Notional Amount Of Interest Rate Derivatives $ 9,248,500
Average Maturity (years) | Y 1.45
Fair Value $ 10,249
Weighted-Average Rate Receive 0.80%
Weighted-Average Rate Pay 0.27%
Asset Conversion Swaps Pay Fixed Generic [Member]  
Additional information about the interest rate swaps used in companies Asset and Liability Management  
Notional Amount Of Interest Rate Derivatives $ 0
Average Maturity (years) | Y 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 Amount Of Interest Rate Derivatives $ 4,579,100
Average Maturity (years) | Y 2.91
Fair Value $ 64,851
Weighted-Average Rate Receive 1.61%
Weighted-Average Rate Pay 0.29%
Liability Conversion Swaps - Receive Fixed - Callable  
Additional information about the interest rate swaps used in companies Asset and Liability Management  
Notional Amount Of Interest Rate Derivatives $ 0
Average Maturity (years) | Y 0
Fair Value $ 0
Weighted-Average Rate Receive 0.00%
Weighted-Average Rate Pay 0.00%