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Affordable Housing Program (AHP) (Tables)
 6 Months Ended
Jun. 30, 2017
Affordable Housing Program (AHP) [Abstract]  
Schedule of Activity in Affordable Housing Program Obligation [Table Text Block]
Analysis of AHP Liability (in thousands)
Balance at December 31, 2016
$
104,883

Assessments (current year additions)
16,986

Subsidy uses, net
(14,548
)
Balance at June 30, 2017
$
107,321