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Capital (Tables)
 3 Months Ended
Mar. 31, 2013
Capital [Abstract]  
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]
Capital Requirements (dollars in thousands)
 
March 31, 2013
 
December 31, 2012
 
Required
 
Actual
 
Required
 
Actual
 
 
 
 
 
 
 
 
Risk-based capital
$
444,311

 
$
5,163,442

 
$
488,754

 
$
4,759,331

Capital-to-assets ratio (regulatory)
4.00
%
 
5.95
%
 
4.00
%
 
5.84
%
Regulatory capital
$
3,469,161

 
$
5,163,442

 
$
3,262,486

 
$
4,759,331

Leverage capital-to-assets ratio (regulatory)
5.00
%
 
8.93
%
 
5.00
%
 
8.75
%
Leverage capital
$
4,336,451

 
$
7,745,163

 
$
4,078,108

 
$
7,138,997
Schedule of Mandatorily Redeemable Capital Stock [Table Text Block]
Mandatorily Redeemable Capital Stock Roll Forward (in thousands)
Balance, December 31, 2012
$
210,828

Capital stock subject to mandatory redemption reclassified
   from equity:
 
Withdrawals
14,618

Other redemptions
3,607

Redemption (or other reduction) of mandatorily redeemable
   capital stock:
 
Withdrawals
(95,098
)
Balance, March 31, 2013
$
133,955
Schedule of Mandatorily Redeemable Capital Stock by Maturity Date [Table Text Block]
Mandatorily Redeemable Capital Stock by Contractual Year of Redemption (in thousands)
Contractual Year of Redemption
 
March 31, 2013
 
December 31, 2012
Due in 1 year or less
 
$
2,026

 
$
1,750

Due after 1 year through 2 years
 
126,155

 
207,439

Due after 2 years through 3 years
 
130

 
130

Due after 3 years through 4 years
 
—

 
—

Due after 4 years through 5 years
 
4,191

 
—

Past contractual redemption date due to remaining activity(1)
 
1,453

 
1,509

Total par value
 
$
133,955

 
$
210,828



(1)
Represents mandatorily redeemable capital stock that is past the end of the contractual redemption period because there is activity outstanding to which the mandatorily redeemable capital stock relates.