Mortgage Loans Held for Portfolio (Tables)

6 Months Ended

Jun. 30, 2017

Mortgage Loans on Real Estate [Abstract]

Mortgage Loans Held for Portfolio [Table Text Block]

Mortgage Loans Held for Portfolio by Collateral/Guarantee Type (in thousands)

	June 30, 2017		December 31, 2016
Unpaid principal balance:
Conventional mortgage loans	$	8,869,888	$	8,534,542
Federal Housing Administration (FHA) mortgage loans	354,308		391,131
Total unpaid principal balance	$	9,224,196	$	8,925,673

Mortgage Loans Held for Portfolio (in thousands)

	June 30, 2017			December 31, 2016
Unpaid principal balance:
Fixed rate medium-term single-family mortgage loans (1)	$	1,225,024		$	1,320,585
Fixed rate long-term single-family mortgage loans	7,999,172			7,605,088
Total unpaid principal balance	9,224,196			8,925,673
Premiums	215,517			211,058
Discounts	(3,567		)	(3,740		)
Hedging basis adjustments (2)	12,044			16,869
Total mortgage loans held for portfolio	$	9,448,190		$	9,149,860

(1) Medium-term is defined as a term of 15 years or less.

(2) Represents the unamortized balance of the mortgage purchase commitments' market values at the time of settlement. The market value of the commitment is included in the basis of the mortgage loan and amortized accordingly.

Members Selling Five Percent or more of Total Unpaid Principal [Table Text Block]

Members, Including Any Known Affiliates that are Members of the FHLB, and Former Members Selling Five Percent or more of Total Unpaid Principal (dollars in millions)

	June 30, 2017					December 31, 2016
	Principal		% of Total			Principal		% of Total
Union Savings Bank	$	3,118	34	%	Union Savings Bank	$	2,886	32	%
Guardian Savings Bank FSB	895		10		Guardian Savings Bank FSB	855		10
PNC Bank, N.A. (1)	583		6		PNC Bank, N.A. (1)	660		7

(1) Former member.