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Held-to-Maturity Securities (Tables)
 6 Months Ended
Jun. 30, 2017
Schedule of Held-to-maturity Securities [Line Items]  
Held-to-maturity Securities [Table Text Block]
Held-to-Maturity Securities by Major Security Types (in thousands)
 
June 30, 2017
 
Amortized Cost (1)
 
Gross Unrecognized Holding
Gains
 
Gross Unrecognized Holding Losses
 
Fair Value
Non-mortgage-backed securities:
 
 
 
 
 
 
 
Government-sponsored enterprises (GSE)
$
32,789

 
$
—

 
$
(3
)
 
$
32,786

Total non-mortgage-backed securities
32,789

 
—

 
(3
)
 
32,786

Mortgage-backed securities:
 
 
 
 
 
 
 
Other U.S. obligation single-family
   mortgage-backed securities
2,881,992

 
4,998

 
(15,951
)
 
2,871,039

GSE single-family mortgage-backed securities
7,457,569

 
44,301

 
(94,278
)
 
7,407,592

GSE multi-family mortgage-backed securities
4,315,028

 
7,903

 
(235
)
 
4,322,696

Total mortgage-backed securities
14,654,589

 
57,202

 
(110,464
)
 
14,601,327

Total
$
14,687,378

 
$
57,202

 
$
(110,467
)
 
$
14,634,113

 
 
 
 
 
 
 
 
 
December 31, 2016
 
Amortized Cost (1)
 
Gross Unrecognized Holding
Gains
 
Gross Unrecognized Holding Losses
 
Fair Value
Non-mortgage-backed securities:
 
 
 
 
 
 
 
GSE
$
31,279

 
$
1

 
$
—

 
$
31,280

Total non-mortgage-backed securities
31,279

 
1

 
—

 
31,280

Mortgage-backed securities:
 
 
 
 
 
 
 
Other U.S. obligation single-family
   mortgage-backed securities
3,183,219

 
3,653

 
(23,151
)
 
3,163,721

GSE single-family mortgage-backed securities
8,186,733

 
36,161

 
(147,494
)
 
8,075,400

GSE multi-family mortgage-backed securities
3,145,748

 
988

 
(3,906
)
 
3,142,830

Total mortgage-backed securities
14,515,700

 
40,802

 
(174,551
)
 
14,381,951

Total
$
14,546,979

 
$
40,803

 
$
(174,551
)
 
$
14,413,231

 
(1)
Carrying value equals amortized cost.
Held-to-maturity Securities [Member]  
Schedule of Held-to-maturity Securities [Line Items]  
Premiums (Discounts) Included in Amortized Cost of Securities [Table Text Block]
Net Purchased Premiums Included in the Amortized Cost of Mortgage-backed Securities Classified as Held-to-Maturity (in thousands)
 
June 30, 2017
 
December 31, 2016
Premiums
$
54,391

 
$
60,519

Discounts
(27,190
)
 
(31,474
)
Net purchased premiums
$
27,201

 
$
29,045
Schedule of Unrealized Loss on Investments [Table Text Block]
Held-to-Maturity Securities in a Continuous Unrealized Loss Position (in thousands)
 
June 30, 2017
 
Less than 12 Months
 
12 Months or more
 
Total
 
Fair Value
 
Gross Unrealized Losses
 
Fair Value
 
Gross Unrealized Losses
 
Fair Value
 
Gross Unrealized Losses
Non-mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
GSE
$
32,786

 
$
(3
)
 
$
—

 
$
—

 
$
32,786

 
$
(3
)
Total non-mortgage-backed securities
32,786

 
(3
)
 
—

 
—

 
32,786

 
(3
)
Mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
Other U.S. obligation single-family
   mortgage-backed securities
1,538,654

 
(15,951
)
 
—

 
—

 
1,538,654

 
(15,951
)
GSE single-family mortgage-backed securities
3,912,027

 
(53,875
)
 
1,122,601

 
(40,403
)
 
5,034,628

 
(94,278
)
GSE multi-family mortgage-backed securities
282,733

 
(235
)
 
—

 
—

 
282,733

 
(235
)
Total mortgage-backed securities
5,733,414

 
(70,061
)
 
1,122,601

 
(40,403
)
 
6,856,015

 
(110,464
)
Total
$
5,766,200

 
$
(70,064
)
 
$
1,122,601

 
$
(40,403
)
 
$
6,888,801

 
$
(110,467
)
 
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2016
 
Less than 12 Months
 
12 Months or more
 
Total
 
Fair Value
 
Gross Unrealized Losses
 
Fair Value
 
Gross Unrealized Losses
 
Fair Value
 
Gross Unrealized Losses
Mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
Other U.S. obligation single-family
   mortgage-backed securities
$
2,151,584

 
$
(23,151
)
 
$
—

 
$
—

 
$
2,151,584

 
$
(23,151
)
GSE single-family mortgage-backed securities
4,548,897

 
(90,119
)
 
1,193,241

 
(57,375
)
 
5,742,138

 
(147,494
)
GSE multi-family mortgage-backed securities
1,897,043

 
(3,906
)
 
—

 
—

 
1,897,043

 
(3,906
)
Total
$
8,597,524

 
$
(117,176
)
 
$
1,193,241

 
$
(57,375
)
 
$
9,790,765

 
$
(174,551
)
Investments Classified by Contractual Maturity Date [Table Text Block]
Held-to-Maturity Securities by Contractual Maturity (in thousands)
 
June 30, 2017
 
December 31, 2016
Year of Maturity
Amortized Cost (1)
 
Fair Value
 
Amortized Cost (1)
 
Fair Value
Non-mortgage-backed securities:
 
 
 
 
 
 
 
Due in 1 year or less
$
32,789

 
$
32,786

 
$
31,279

 
$
31,280

Due after 1 year through 5 years
—

 
—

 
—

 
—

Due after 5 years through 10 years
—

 
—

 
—

 
—

Due after 10 years
—

 
—

 
—

 
—

Total non-mortgage-backed securities
32,789

 
32,786

 
31,279

 
31,280

Mortgage-backed securities (2)
14,654,589

 
14,601,327

 
14,515,700

 
14,381,951

Total
$
14,687,378

 
$
14,634,113

 
$
14,546,979

 
$
14,413,231

(1)
Carrying value equals amortized cost.
(2)
Mortgage-backed securities are not presented by contractual maturity because their expected maturities will likely differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment fees.
Schedule of Interest Rate Payment Terms For Investments [Table Text Block]
Interest Rate Payment Terms of Held-to-Maturity Securities (in thousands)
 
June 30, 2017
 
December 31, 2016
Amortized cost of non-mortgage-backed securities:
 
 
 
Fixed-rate
$
32,789

 
$
31,279

Total amortized cost of non-mortgage-backed securities
32,789

 
31,279

Amortized cost of mortgage-backed securities:
 
 
 
Fixed-rate
8,878,017

 
9,706,072

Variable-rate
5,776,572

 
4,809,628

Total amortized cost of mortgage-backed securities
14,654,589

 
14,515,700

Total
$
14,687,378

 
$
14,546,979