Capital (Mandatorily Redeemable Capital Stock by Contractual Year of Redemption) (Details) - USD ($) $ in Thousands		Jun. 30, 2017	Dec. 31, 2016
Capital [Abstract]
Due in 1 year or less		$ 0	$ 0
Due after 1 year through 2 years		1,942	29
Due after 2 years through 3 years		623	2,264
Due after 3 years through 4 years		4,637	865
Due after 4 years through 5 years		5,875	6,307
Financial Instruments Subject to Mandatory Redemption, Redeemable After Year Five	[1]	551	623
Past contractual redemption date due to remaining activity	[2]	22,341	24,694
Total par value		$ 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.