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Offsetting Assets and Liabilities Offsetting Liabilities (Tables)
 9 Months Ended
Sep. 30, 2013
Offsetting Liabilities [Line Items]  
Offsetting Liabilities [Table Text Block]
 
Offsetting of Liabilities
 
Gross Amount of Recognized Liabilities
 
Gross Amount Offset in the Balance Sheet
 
Net Amount of Liabilities Presented in the Balance Sheet
 
Gross Amount Not Offset in the Balance Sheet
 
Net Amount
Financial Instruments Posted as Collateral
 
Cash Posted as Collateral
September 30, 2013
 
 
 
 
 
 
 
 
 
 
 
Derivative liabilities
$
20,837

 
$
—

 
$
20,837

 
$
(20,175
)
 
$
(490
)
 
$
172

Repurchase agreements
3,674,850

 
—

 
3,674,850

 
(3,674,850
)
 
—

 
—

 
$
3,695,687

 
$
—

 
$
3,695,687

 
$
(3,695,025
)
 
$
(490
)
 
$
172

 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2012:
 
 
 
 
 
 
 
 
 
 
 
Derivative liabilities
$
42,537

 
$
—

 
$
42,537

 
$
(42,499
)
 
$
(38
)
 
$
—

Repurchase agreements
3,564,128

 
—

 
3,564,128

 
(3,564,128
)
 
—

 
—

 
$
3,606,665

 
$
—

 
$
3,606,665

 
$
(3,606,627
)
 
$
(38
)
 
$
—