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Capital (Tables)
 6 Months Ended
Jun. 30, 2017
Capital [Abstract]  
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]
Capital Requirements (dollars in thousands)
 
June 30, 2017
 
December 31, 2016
 
Minimum Requirement
 
Actual
 
Minimum Requirement
 
Actual
Risk-based capital
$
781,940

 
$
5,146,274

 
$
579,629

 
$
5,026,133

Capital-to-assets ratio (regulatory)
4.00
%
 
4.72
%
 
4.00
%
 
4.80
%
Regulatory capital
$
4,362,112

 
$
5,146,274

 
$
4,185,411

 
$
5,026,133

Leverage capital-to-assets ratio (regulatory)
5.00
%
 
7.08
%
 
5.00
%
 
7.21
%
Leverage capital
$
5,452,640

 
$
7,719,411

 
$
5,231,764

 
$
7,539,200
Schedule of Mandatorily Redeemable Capital Stock [Table Text Block]
Mandatorily Redeemable Capital Stock Roll Forward (in thousands)
Balance, December 31, 2016
$
34,782

Capital stock subject to mandatory redemption reclassified from equity
187,405

Redemption (or other reduction) of mandatorily redeemable capital stock
(186,218
)
Balance, June 30, 2017
$
35,969
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
 
June 30, 2017
 
December 31, 2016
Year 1
 
$
—

 
$
—

Year 2 
 
1,942

 
29

Year 3
 
623

 
2,264

Year 4 
 
4,637

 
865

Year 5 
 
5,875

 
6,307

Thereafter (1)
 
551

 
623

Past contractual redemption date due to remaining activity (2)
 
22,341

 
24,694

Total
 
$
35,969

 
$
34,782

(1)
Represents mandatorily redeemable capital stock resulting from a Finance Agency rule effective February 2016, that made captive insurance companies ineligible for FHLB membership. Captive insurance companies that were admitted as FHLB members prior to September 12, 2014, will have their membership terminated no later than February 19, 2021. Captive insurance companies that were admitted as FHLB members on or after September 12, 2014, had their membership terminated no later than February 19, 2017. The related mandatorily redeemable capital stock is not required to be redeemed until five years after the member's termination.
(2)
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.