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Available-for-Sale Securities (Tables)
 12 Months Ended
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]  
Available-for-Sale (AFS) Securities by Major Security Type [Table Text Block]
Table 6.1 - Available-for-Sale Securities by Major Security Type
(dollars in thousands)

 
December 31, 2019
 
 
 
Amounts Recorded in Accumulated Other Comprehensive Loss
 
 
 
Amortized
Cost (1)
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
 Value
State housing-finance-agency obligations (HFA securities)
$
69,320

 
$
—

 
$
(4,668
)
 
$
64,652

Supranational institutions
429,354

 
—

 
(12,925
)
 
416,429

U.S. government-owned corporations
323,192

 
—

 
(26,431
)
 
296,761

GSE
130,935

 
—

 
(7,149
)
 
123,786

 
952,801

 
—

 
(51,173
)
 
901,628

MBS
 

 
 

 
 

 
 

U.S. government guaranteed – single-family
60,003

 
—

 
(2,289
)
 
57,714

U.S. government guaranteed – multifamily
283,674

 
—

 
(1,057
)
 
282,617

GSE – single-family
2,598,325

 
5,323

 
(13,377
)
 
2,590,271

GSE – multifamily
3,588,119

 
3,109

 
(14,458
)
 
3,576,770

 
6,530,121

 
8,432

 
(31,181
)
 
6,507,372

Total
$
7,482,922

 
$
8,432

 
$
(82,354
)
 
$
7,409,000


 
December 31, 2018
 
 
 
Amounts Recorded in Accumulated Other Comprehensive Loss
 
 
 
Amortized
Cost (1)
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
 Value
HFA securities
$
55,500

 
$
—

 
$
(5,899
)
 
$
49,601

Supranational institutions
419,222

 
—

 
(14,067
)
 
405,155

U.S. government-owned corporations
297,729

 
—

 
(24,560
)
 
273,169

GSE
122,423

 
—

 
(6,796
)
 
115,627

 
894,874

 
—

 
(51,322
)
 
843,552

MBS
 

 
 

 
 

 
 

U.S. government guaranteed – single-family
79,075

 
20

 
(3,437
)
 
75,658

U.S. government guaranteed – multifamily
368,103

 
—

 
(6,969
)
 
361,134

GSE – single-family
3,649,964

 
681

 
(88,486
)
 
3,562,159

GSE – multifamily
1,010,886

 
168

 
(3,613
)
 
1,007,441

 
5,108,028

 
869

 
(102,505
)
 
5,006,392

Total
$
6,002,902

 
$
869

 
$
(153,827
)
 
$
5,849,944


_______________________
(1)
Amortized cost of available-for-sale securities includes adjustments made to the cost basis of an investment for accretion, amortization, collection of cash, and fair-value hedge accounting adjustments.
Available-for-sale Securities [Member]  
Debt Securities, Available-for-sale [Line Items]  
AFS Securities in a Continuous Unrealized Loss Position [Table Text Block]
Table 6.2 - Available-for-Sale Securities in a Continuous Unrealized Loss Position
(dollars in thousands)

 
December 31, 2019
 
Continuous Unrealized Loss Less than 12 Months
 
Continuous Unrealized Loss 12 Months or More
 
Total
 
Fair
 Value
 
Unrealized
 Losses
 
Fair
 Value
 
Unrealized
 Losses
 
Fair
 Value
 
Unrealized
 Losses
HFA securities
$
12,229

 
$
(1,591
)
 
$
52,423

 
$
(3,077
)
 
$
64,652

 
$
(4,668
)
Supranational institutions
—

 
—

 
416,429

 
(12,925
)
 
416,429

 
(12,925
)
U.S. government-owned corporations
—

 
—

 
296,761

 
(26,431
)
 
296,761

 
(26,431
)
GSE
—

 
—

 
123,786

 
(7,149
)
 
123,786

 
(7,149
)
 
12,229

 
(1,591
)
 
889,399

 
(49,582
)
 
901,628

 
(51,173
)
 
 
 
 
 
 
 
 
 
 
 
 
MBS
 

 
 

 
 

 
 

 
 

 
 

U.S. government guaranteed – single-family
10,885

 
(1
)
 
45,490

 
(2,288
)
 
56,375

 
(2,289
)
U.S. government guaranteed – multifamily
—

 
—

 
282,617

 
(1,057
)
 
282,617

 
(1,057
)
GSE – single-family
189,402

 
(968
)
 
1,423,927

 
(12,409
)
 
1,613,329

 
(13,377
)
GSE – multifamily
1,800,586

 
(13,242
)
 
405,778

 
(1,216
)
 
2,206,364

 
(14,458
)
 
2,000,873

 
(14,211
)
 
2,157,812

 
(16,970
)
 
4,158,685

 
(31,181
)
Total temporarily impaired
$
2,013,102

 
$
(15,802
)
 
$
3,047,211


$
(66,552
)

$
5,060,313


$
(82,354
)

 
December 31, 2018
 
Continuous Unrealized Loss Less than 12 Months
 
Continuous Unrealized Loss 12 Months or More
 
Total
 
Fair
 Value
 
Unrealized
 Losses
 
Fair
 Value
 
Unrealized
 Losses
 
Fair
 Value
 
Unrealized
 Losses
HFA securities
$
11,118

 
$
(1,682
)
 
$
38,483

 
$
(4,217
)
 
$
49,601

 
$
(5,899
)
Supranational institutions
—

 
—

 
405,155

 
(14,067
)
 
405,155

 
(14,067
)
U.S. government-owned corporations
—

 
—

 
273,169

 
(24,560
)
 
273,169

 
(24,560
)
GSE
—

 
—

 
115,627

 
(6,796
)
 
115,627

 
(6,796
)
 
11,118

 
(1,682
)
 
832,434

 
(49,640
)
 
843,552

 
(51,322
)
MBS
 

 
 

 
 

 
 

 
 

 
 

U.S. government guaranteed – single-family
—

 
—

 
57,679

 
(3,437
)
 
57,679

 
(3,437
)
U.S. government guaranteed – multifamily
—

 
—

 
361,134

 
(6,969
)
 
361,134

 
(6,969
)
GSE – single-family
53,122

 
(388
)
 
3,417,076

 
(88,098
)
 
3,470,198

 
(88,486
)
GSE – multifamily
902,850

 
(3,613
)
 
—

 
—

 
902,850

 
(3,613
)
 
955,972

 
(4,001
)
 
3,835,889

 
(98,504
)
 
4,791,861

 
(102,505
)
Total temporarily impaired
$
967,090

 
$
(5,683
)
 
$
4,668,323

 
$
(148,144
)
 
$
5,635,413

 
$
(153,827
)
Investments Classified by Contractual Maturity Date [Table Text Block]

Table 6.3 - Available-for-Sale Securities by Contractual Maturity
(dollars in thousands)
 
December 31, 2019
 
December 31, 2018
Year of Maturity
Amortized
Cost
 
Fair
 Value
 
Amortized
Cost
 
Fair
 Value
Due in one year or less
$
7,600

 
$
7,563

 
$
—

 
$
—

Due after one year through five years
61,720

 
57,089

 
55,500

 
49,601

Due after five years through 10 years
477,232

 
463,465

 
465,248

 
450,102

Due after 10 years
406,249

 
373,511

 
374,126

 
343,849

 
952,801

 
901,628

 
894,874

 
843,552

MBS (1)
6,530,121

 
6,507,372

 
5,108,028

 
5,006,392

Total
$
7,482,922

 
$
7,409,000

 
$
6,002,902

 
$
5,849,944

_______________________
(1)
MBS are not presented by contractual maturity because their expected maturities will likely differ from contractual maturities because borrowers of the underlying loans may have the right to call or prepay obligations with or without call or prepayment fees.