Federal Home Loan Bank of Boston 10-Q10 Nov 212021 Q3 Quarterly reportFinancial data

Company Profile

Cover Page

Cover Page - shares	9 Months Ended
Cover Page - shares	Sep. 30, 2021	Oct. 31, 2021
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Entity File Number	000-51402
Entity Registrant Name	FEDERAL HOME LOAN BANK OF BOSTON
Entity Tax Identification Number	04-6002575
Entity Address, Address Line One	800 Boylston Street,
Entity Address, City or Town	Boston
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02199
City Area Code	(617)
Local Phone Number	292-9600
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Amendment Flag	false
Entity Central Index Key	0001331463
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Entity Incorporation, State or Country Code	X1
Common Class A [Member]
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		0
Common Class B [Member]
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		10,269,108

Statements of Condition (unaudi

Statements of Condition (unaudited) - USD ($) shares in Thousands, $ in Thousands		Sep. 30, 2021	Dec. 31, 2020
ASSETS
Cash and due from banks		$ 205,284	$ 2,050,028
Interest-bearing deposits		149	299,149
Securities purchased under agreements to resell		500,000	750,000
Federal funds sold		1,848,000	2,260,000
Investment securities:
Trading securities		1,759,851	3,605,079
Available-for-sale securities		12,132,257	6,220,148
Held-to-maturity securities	[1]	164,167	207,162
Total investment securities		14,056,275	10,032,389
Advances	[2]	14,056,991	18,817,002
Mortgage loans held for portfolio, net of allowance for credit losses of $2,055 and $3,100 at September 30, 2021 and December 31, 2020, respectively		3,283,925	3,930,252
Accrued interest receivable		74,470	87,582
Derivative assets, net		356,261	161,238
Other assets		67,562	73,395
Total Assets		34,448,917	38,461,035
Deposits
Interest-bearing		903,270	977,994
Non-interest-bearing		67,462	110,993
Total deposits		970,732	1,088,987
Consolidated obligations (COs):
Bonds		25,097,469	21,471,590
Discount notes		5,554,103	12,878,310
Total consolidated obligations		30,651,572	34,349,900
Mandatorily redeemable capital stock		13,890	6,282
Accrued interest payable		59,159	61,918
Affordable Housing Program (AHP) payable		72,448	78,640
Derivative liabilities, net		21,401	24,062
Other liabilities		63,005	69,293
Total liabilities		31,852,207	35,679,082
Commitments and contingencies (Note 13)
Capital
Capital stock – Class B – putable ($100 par value), 10,282 shares and 12,672 shares issued and outstanding at September 30, 2021 and December 31, 2020, respectively		1,028,177	1,267,172
Retained earnings:
Unrestricted		1,159,509	1,130,222
Restricted		368,420	368,420
Total retained earnings		1,527,929	1,498,642
Accumulated other comprehensive income		40,604	16,139
Total capital		2,596,710	2,781,953
Total Liabilities and Capital		34,448,917	38,461,035
Mortgage loans - allowance for credit losses		$ 2,055	$ 3,100
Common Stock, Class B, putable shares issued		10,282	12,672
Common Stock, Class B, putable shares outstanding		10,282	12,672

[1]	Fair values of held-to-maturity securities were $167,598 and $211,837 at September 30, 2021, and December 31, 2020, respectively.
[2]	Excludes accrued interest receivable of $21.5 million and $25.8 million at September 30, 2021, and December 31, 2020, respectively.

Statements of Condition (Parent

Statements of Condition (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Held-to-maturity fair value	$ 167,598	$ 211,837

Statements of Operations (unaud

Statements of Operations (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
INTEREST INCOME
Advances	$ 40,864	$ 71,218	$ 133,646	$ 340,695
Prepayment fees on advances, net	5,310	5,646	17,275	10,648
Interest-bearing deposits	13	271	107	5,625
Securities purchased under agreements to resell	68	239	360	14,813
Federal funds sold	672	275	1,768	17,416
Investment securities:
Trading securities	11,502	23,262	43,951	62,641
Available-for-sale securities	18,901	17,495	52,737	46,993
Held-to-maturity securities	598	1,760	1,997	17,906
Total investment securities	31,001	42,517	98,685	127,540
Mortgage loans held for portfolio	22,984	28,732	71,128	98,911
Other	0	0	0	47
Total interest income	100,912	148,898	322,969	615,695
Consolidated obligations:
Bonds	48,861	82,962	164,146	300,765
Discount notes	904	8,728	3,989	183,792
Total consolidated obligations	49,765	91,690	168,135	484,557
Deposits	23	26	73	891
Mandatorily redeemable capital stock	55	58	104	196
Other borrowings	4	6	13	235
Total interest expense	49,847	91,780	168,325	485,879
NET INTEREST INCOME	51,065	57,118	154,644	129,816
Reduction of provision for credit losses	(80)	(5,143)	(1,107)	(2,924)
NET INTEREST INCOME AFTER REDUCTION OF PROVISION FOR CREDIT LOSSES	51,145	62,261	155,751	132,740
OTHER INCOME (LOSS)
Loss on early extinguishment of debt	(1,688)	0	(6,636)	0
Service fees	2,574	3,174	7,954	10,016
Net unrealized (losses) gains on trading securities	(11,094)	(19,603)	(40,536)	7,767
Net (losses) gains on derivatives	(387)	1,624	(788)	(52,095)
Realized net gain from sale of available-for-sale securities	0	26,210	0	26,210
Realized net gain from sale of held-to-maturity securities	0	6,680	0	47,413
Other, net	142	25	686	219
Total other (loss) income	(10,453)	18,110	(39,320)	39,530
OTHER EXPENSE
Compensation and benefits	10,374	9,970	31,073	31,596
Other operating expenses	5,923	5,782	17,787	17,788
Federal Housing Finance Agency (the FHFA)	957	947	2,871	2,841
Office of Finance	1,018	833	2,768	2,666
AHP voluntary contribution	1,234	0	6,023	0
Other	2,824	3,326	7,498	8,454
Total other expense	22,330	20,858	68,020	63,345
INCOME BEFORE ASSESSMENTS	18,362	59,513	48,411	108,925
AHP assessments	1,842	5,957	4,852	10,912
NET INCOME	$ 16,520	$ 53,556	$ 43,559	$ 98,013

Statements of Comprehensive Inc

Statements of Comprehensive Income (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 16,520	$ 53,556	$ 43,559	$ 98,013
Other comprehensive income:
Net unrealized (losses) gains on available-for-sale securities	(17,961)	52,286	17,931	82,208
Net noncredit portion of other-than-temporary impairment gains on held-to-maturity securities	0	50,407	0	76,036
Net unrealized gains relating to hedging activities	10,125	1,803	4,150	4,054
Pension and postretirement benefits	795	(92)	2,384	607
Total other comprehensive income (loss)	(7,041)	104,404	24,465	162,905
Comprehensive income	$ 9,479	$ 157,960	$ 68,024	$ 260,918

Statements of Capital (unaudite

Statements of Capital (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning of period	$ 2,644,401	$ 2,845,628	$ 2,781,953	$ 3,145,312
Comprehensive income	9,479	157,960	68,024	260,918
Proceeds from issuance of capital stock	49,047	456,556	147,231	2,032,462
Repurchase of capital stock	(93,369)	(380,212)	(376,086)	(2,306,298)
Shares reclassified to mandatorily redeemable capital stock	(8,558)		(10,140)	(435)
Partial recovery of prior capital distribution to Financing Corporation			0	3,726
Cash dividends on capital stock	(4,290)	(18,845)	(14,272)	(67,068)
Period end	2,596,710	3,061,087	2,596,710	3,061,087
Cumulative Effect, Period of Adoption, Adjustment \| Accounting Standards Update 2016-13
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning of period				(7,530)
Retained Earnings, Unrestricted
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning of period	1,147,279	1,097,875	1,130,222	1,114,337
Comprehensive income	16,520	42,845	43,559	78,410
Partial recovery of prior capital distribution to Financing Corporation				3,726
Cash dividends on capital stock	(4,290)	(18,845)	(14,272)	(67,068)
Period end	1,159,509	1,121,875	1,159,509	1,121,875
Retained Earnings, Unrestricted \| Cumulative Effect, Period of Adoption, Adjustment \| Accounting Standards Update 2016-13
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning of period				(7,530)
Retained Earnings, Restricted
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning of period	368,420	357,709	368,420	348,817
Comprehensive income	0	10,711	0	19,603
Period end	368,420	368,420	368,420	368,420
Retained Earnings, Restricted \| Cumulative Effect, Period of Adoption, Adjustment \| Accounting Standards Update 2016-13
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning of period				0
Retained Earnings, Total
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning of period	1,515,699	1,455,584	1,498,642	1,463,154
Comprehensive income	16,520	53,556	43,559	98,013
Partial recovery of prior capital distribution to Financing Corporation				3,726
Cash dividends on capital stock	(4,290)	(18,845)	(14,272)	(67,068)
Period end	1,527,929	1,490,295	1,527,929	1,490,295
Retained Earnings, Total \| Cumulative Effect, Period of Adoption, Adjustment \| Accounting Standards Update 2016-13
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning of period				(7,530)
Accumulated Other Comprehensive (Loss) Income
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning of period	47,645	(128,471)	16,139	(186,972)
Comprehensive income	(7,041)	104,404	24,465	162,905
Period end	$ 40,604	$ (24,067)	$ 40,604	(24,067)
Accumulated Other Comprehensive (Loss) Income \| Cumulative Effect, Period of Adoption, Adjustment \| Accounting Standards Update 2016-13
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning of period				$ 0
Common Class B [Member] \| Capital Stock Class B - Putable
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning of period, shares	10,811	15,185	12,672	18,691
Beginning of period	$ 1,081,057	$ 1,518,515	$ 1,267,172	$ 1,869,130
Proceeds from issuance of capital stock, shares	490	4,566	1,472	20,325
Proceeds from issuance of capital stock	$ 49,047	$ 456,556	$ 147,231	$ 2,032,462
Repurchase of capital stock, shares	(934)	(3,802)	(3,761)	(23,063)
Repurchase of capital stock	$ (93,369)	$ (380,212)	$ (376,086)	$ (2,306,298)
Shares reclassified to mandatorily redeemable capital stock, shares	(85)		(101)	(4)
Shares reclassified to mandatorily redeemable capital stock	$ (8,558)		$ (10,140)	$ (435)
Period end, shares	10,282	15,949	10,282	15,949
Period end	$ 1,028,177	$ 1,594,859	$ 1,028,177	$ 1,594,859

Statements of Cash Flows (unaud

Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
OPERATING ACTIVITIES
Net Income			$ 43,559	$ 98,013
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization			(2,576)	(18,302)
Reduction of provision for credit losses	$ (80)	$ (5,143)	(1,107)	(2,924)
Change in net fair-value adjustments on derivatives and hedging activities			169,079	(267,556)
Loss on early extinguishment of debt	1,688	0	6,636	0
Other adjustments, net			2,613	3,134
Realized net gain from sale of available-for sale securities	0	(26,210)	0	(26,210)
Realized net gain from sale of held-to-maturity securities	0	(6,680)	0	(47,413)
Net change in:
Market value of trading securities			40,536	(7,767)
Accrued interest receivable			13,112	19,040
Other assets			(3,547)	885
Accrued interest payable			(2,758)	(20,986)
Other liabilities			(9,085)	(9,925)
Total adjustments			212,903	(378,024)
Net cash provided by (used in) operating activities			256,462	(280,011)
INVESTING ACTIVITIES
Interest-bearing deposits			74,798	893,640
Securities purchased under agreements to resell			250,000	1,750,000
Federal funds sold			412,000	572,000
Trading securities:
Proceeds			1,804,692	1,426,057
Purchases			0	(3,293,082)
Available-for-sale securities:
Proceeds			779,323	1,454,914
Purchases			(6,860,594)	0
Held-to-maturity securities:
Proceeds			43,635	487,314
Advances to members:
Repaid			30,610,885	225,147,120
Originated			(25,920,816)	(217,384,347)
Mortgage loans held for portfolio:
Proceeds			997,159	894,829
Purchases			(367,551)	(572,966)
Other investing activities, net			(477)	(444)
Net Cash provided by investing activities			1,823,054	11,375,035
FINANCING ACTIVITIES
Net change in deposits			(118,255)	552,834
Net payments on derivatives with a financing element			31,411	(97,522)
Net proceeds from issuance of consolidated obligations:
Discount notes			218,841,791	82,218,174
Bonds			16,287,784	10,694,110
Payments for maturing and retiring consolidated obligations:
Discount notes			(226,164,148)	(93,348,677)
Bonds			(12,383,048)	(10,638,560)
Bonds transferred to other FHLBanks			(173,984)	0
Payment of financing lease			(152)	(114)
Partial recovery of prior capital distribution to Financing Corporation			0	3,726
Proceeds from issuance of capital stock			147,231	2,032,462
Payments for repurchase of capital stock			(376,086)	(2,306,298)
Payments for redemption of mandatorily redeemable capital stock			(2,532)	(106)
Cash dividends paid			(14,272)	(67,068)
Net cash used in financing activities			(3,924,260)	(10,957,039)
Net (decrease) increase in cash and due from banks			(1,844,744)	137,985
Cash and due from banks at beginning of the period			2,050,028	69,416	$ 69,416
Cash and due from banks at end of the period	$ 205,284	$ 207,401	205,284	207,401	2,050,028
Supplemental disclosures:
Interest paid			202,849	573,334
AHP payments			14,690	14,137	$ 21,374
Noncash transfers of mortgage loans held for portfolio to other assets			368	394
Noncash transfer of held-to-maturity securities to available-for-sale securities with the adoption of the reference rate reform guidance (amortized cost)			$ 0	$ 254,217

Basis of Presentation

Basis of Presentation	9 Months Ended
Basis of Presentation	Sep. 30, 2021
Accounting Policies [Abstract]
Basis of Accounting [Text Block]	Basis of PresentationThe accompanying unaudited financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP) for interim financial information. In the opinion of management, all adjustments considered necessary have been included. All such adjustments consist of normal recurring accruals. The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates. The results of operations for interim periods are not necessarily indicative of the results to be expected for the year ending December 31, 2021. These interim financial statements do not include all the information and footnotes required by GAAP for complete annual financial statements and accordingly should be read in conjunction with the Federal Home Loan Bank of Boston's audited financial statements and related notes in our Annual Report on Form 10-K for the year ended December 31, 2020, filed with the Securities and Exchange Commission (the SEC) on March 19, 2021 (the 2020 Annual Report). Unless otherwise indicated or the context requires otherwise, all references in this discussion to “the Bank,” "we," "us," "our," or similar references mean the Federal Home Loan Bank of Boston.

Recently Issued and Adopted Acc

Recently Issued and Adopted Accounting Guidance	9 Months Ended
Recently Issued and Adopted Accounting Guidance	Sep. 30, 2021
Accounting Standards Update and Change in Accounting Principle [Abstract]
New Accounting Pronouncements and Changes in Accounting Principles [Text Block]	Recently Issued and Adopted Accounting Guidance Effective Beginning in 2020 Facilitation of the Effects of Reference Rate Reform on Financial Reporting. On March 12, 2020, the Financial Accounting Standards Board (FASB) released temporary optional guidance that provides transition relief for reference rate reform. The guidance contains optional expedients and exceptions for applying generally accepted accounting principles to contract modifications, hedging relationships, and other transactions that reference London inter-bank offered rate (LIBOR) or a reference rate that is expected to be discontinued as a result of reference rate reform if certain criteria are met. This standard was effective upon issuance and the provisions generally can be applied prospectively as of January 1, 2020, through December 31, 2022. In addition to the optional expedients for contract modifications and hedging relationships, this update provides a one-time election to sell, transfer, or both sell and transfer debt securities classified as held-to-maturity that reference a rate affected by reference rate reform and that were classified as held-to-maturity before January 1, 2020. In the third quarter of 2020, we adopted the provision of this guidance which allows a one-time election to sell, transfer, or both sell and transfer debt securities classified as held-to-maturity. See Note 3 — Investments for additional information related to these sales and transfers. In the fourth quarter of 2020, we retrospectively elected to adopt the provision of this guidance specific to the modification of interest rates used for the discounting of derivative instruments. This did not have a material effect on our financial condition, results of operations, or cash flows. We are in the process of evaluating the remaining provisions of this guidance, and the anticipated effects on our financial condition, results of operations, and cash flows have not yet been determined.

Investments

Investments	9 Months Ended
Investments	Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]	Investments Interest-Bearing Deposits, Securities Purchased under Agreements to Resell, and Federal Funds Sold We invest in interest-bearing deposits, securities purchased under agreements to resell, and federal funds sold to provide short-term liquidity. These investments are generally transacted with counterparties that have received, or whose guarantors have received, a credit rating of triple-B or greater (investment grade) by a nationally recognized statistical rating organization (NRSRO), or the equivalent. At September 30, 2021, none of these investments were made to counterparties or, if applicable, guaranteed by entities rated below triple-B. Securities purchased under agreements to resell are short-term and structured such that they are evaluated daily to determine if the market value of the underlying securities decreases below the market value required as collateral (i.e. subject to collateral maintenance provisions). If so, the counterparty must place an amount of additional securities as collateral or remit an equivalent amount of cash sufficient to comply with collateral maintenance provisions, generally by the next business day. Based upon the collateral held as security and collateral maintenance provisions with our counterparties, we determined that no allowance for credit losses was needed for our securities purchased under agreements to resell at September 30, 2021. Federal funds sold are unsecured loans to banks that are generally transacted on an overnight basis. FHFA regulations include a limit on the amount of unsecured credit we may extend to a counterparty. At September 30, 2021, and December 31, 2020, all investments in interest-bearing demand deposits and federal funds sold were repaid according to the contractual terms. No allowance for credit losses was recorded for these assets at September 30, 2021. The effects of the COVID-19 pandemic (and related fiscal stimulus and monetary policies) on the global economy and financial markets could put pressure on our bank counterparties’ profitability, asset quality, and in some cases, capitalization. We continually monitor the creditworthiness of our counterparties and may reduce or suspend individual credit lines as conditions warrant. Debt Securities We invest in debt securities, which are classified as either trading, available-for-sale, or held-to-maturity. We are prohibited by FHFA regulations from investing in certain higher-risk securities, such as equity securities and debt instruments that are not investment quality, other than certain investments targeted at low-income persons or communities, but we are not required to divest instruments that experienced credit deterioration after their purchase. Trading Securities Table 3.1 - Trading Securities by Major Security Type (dollars in thousands) September 30, 2021 December 31, 2020 Corporate bonds $ 1,524 $ 5,422 U.S. Treasury obligations 1,756,149 3,596,718 1,757,673 3,602,140 Mortgage-backed securities (MBS) U.S. government-guaranteed – single-family 2,133 2,884 Government-sponsored enterprises (GSE) – single-family 45 55 2,178 2,939 Total $ 1,759,851 $ 3,605,079 Table 3.2 - Unrealized and Realized Gains (Losses) on Trading Securities (dollars in thousands) For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 Net unrealized (losses) gains on trading securities held at period end $ (9,841) $ (18,318) $ (25,811) $ 9,385 Net unrealized and realized losses on trading securities sold or matured during the period (1,253) (1,285) (14,725) (1,618) Net unrealized (losses) gains on trading securities $ (11,094) $ (19,603) $ (40,536) $ 7,767 We do not participate in speculative trading practices and typically hold these investments over a longer time horizon. Available-for-sale Securities Table 3.3 - Available-for-Sale Securities by Major Security Type (dollars in thousands) September 30, 2021 Amounts Recorded in Accumulated Other Comprehensive Income Amortized Cost (1) Unrealized Unrealized Fair U.S. Treasury obligations $ 4,386,399 $ 2,017 $ (744) $ 4,387,672 State housing-finance-agency obligations (HFA securities) 74,765 2 (925) 73,842 Supranational institutions 417,730 87 (6,216) 411,601 U.S. government-owned corporations 325,580 — (21,074) 304,506 GSE 130,836 — (4,528) 126,308 5,335,310 2,106 (33,487) 5,303,929 MBS U.S. government guaranteed – single-family 22,678 347 — 23,025 U.S. government guaranteed – multifamily 453,661 230 — 453,891 GSE – single-family 1,205,083 18,486 (65) 1,223,504 GSE – multifamily 5,049,026 101,326 (22,444) 5,127,908 6,730,448 120,389 (22,509) 6,828,328 Total $ 12,065,758 $ 122,495 $ (55,996) $ 12,132,257 December 31, 2020 Amounts Recorded in Accumulated Other Comprehensive Income Amortized Cost (1) Unrealized Unrealized Fair HFA securities $ 126,930 $ — $ (4,381) $ 122,549 Supranational institutions 442,225 — (12,156) 430,069 U.S. government-owned corporations 350,052 — (27,991) 322,061 GSE 140,136 — (5,144) 134,992 1,059,343 — (49,672) 1,009,671 MBS U.S. government guaranteed – single-family 29,148 260 — 29,408 U.S. government guaranteed – multifamily 46,829 351 — 47,180 GSE – single-family 1,442,282 26,790 (24) 1,469,048 GSE – multifamily 3,593,978 70,863 — 3,664,841 5,112,237 98,264 (24) 5,210,477 Total $ 6,171,580 $ 98,264 $ (49,696) $ 6,220,148 _______________________ (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. Amortized cost excludes accrued interest receivable of $24.2 million and $24.0 million at September 30, 2021, and December 31, 2020, respectively. Table 3.4 - Available-for-Sale Securities in a Continuous Unrealized Loss Position (dollars in thousands) September 30, 2021 Continuous Unrealized Loss Less than 12 Months Continuous Unrealized Loss 12 Months or More Total Fair Unrealized Fair Unrealized Fair Unrealized U.S. Treasury obligations $ 1,959,169 $ (744) $ — $ — $ 1,959,169 $ (744) HFA securities — — 60,795 (925) 60,795 (925) Supranational institutions — — 396,677 (6,216) 396,677 (6,216) U.S. government-owned corporations — — 304,506 (21,074) 304,506 (21,074) GSE — — 126,308 (4,528) 126,308 (4,528) 1,959,169 (744) 888,286 (32,743) 2,847,455 (33,487) MBS GSE – single-family 87,064 (65) — — 87,064 (65) GSE – multifamily 982,060 (22,444) — — 982,060 (22,444) 1,069,124 (22,509) — — 1,069,124 (22,509) Total $ 3,028,293 $ (23,253) $ 888,286 $ (32,743) $ 3,916,579 $ (55,996) December 31, 2020 Continuous Unrealized Loss Less than 12 Months Continuous Unrealized Loss 12 Months or More Total Fair Unrealized Fair Unrealized Fair Unrealized HFA securities $ — $ — $ 109,780 $ (4,381) $ 109,780 $ (4,381) Supranational institutions — — 430,069 (12,156) 430,069 (12,156) U.S. government-owned corporations — — 322,061 (27,991) 322,061 (27,991) GSE — — 134,992 (5,144) 134,992 (5,144) — — 996,902 (49,672) 996,902 (49,672) MBS GSE – single-family — — 10,271 (24) 10,271 (24) Total $ — $ — $ 1,007,173 $ (49,696) $ 1,007,173 $ (49,696) Table 3.5 - Available-for-Sale Securities by Contractual Maturity (dollars in thousands) September 30, 2021 December 31, 2020 Year of Maturity Amortized Fair Amortized Fair Due in one year or less $ 10,600 $ 10,591 $ 10,600 $ 10,524 Due after one year through five years 1,201,851 1,199,354 169,570 166,813 Due after five years through 10 years 3,713,611 3,710,246 400,477 389,753 Due after 10 years 409,248 383,738 478,696 442,581 5,335,310 5,303,929 1,059,343 1,009,671 MBS (1) 6,730,448 6,828,328 5,112,237 5,210,477 Total $ 12,065,758 $ 12,132,257 $ 6,171,580 $ 6,220,148 _______________________ (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. Held-to-Maturity Securities Table 3.6 - Held-to-Maturity Securities by Major Security Type (dollars in thousands) September 30, 2021 Amortized Cost (1) Gross Unrecognized Holding Gains Gross Unrecognized Holding Losses Fair Value MBS U.S. government guaranteed – single-family $ 4,567 $ 87 $ — $ 4,654 GSE – single-family 159,600 3,440 (96) 162,944 Total $ 164,167 $ 3,527 $ (96) $ 167,598 December 31, 2020 Amortized Cost (1) Gross Unrecognized Holding Gains Gross Unrecognized Holding Losses Fair Value MBS U.S. government guaranteed – single-family $ 5,388 $ 103 $ — $ 5,491 GSE – single-family 201,774 4,681 (109) 206,346 Total $ 207,162 $ 4,784 $ (109) $ 211,837 _______________________ (1) Amortized cost of held-to-maturity securities includes adjustments made to the cost basis of an investment for accretion, amortization, and collection of cash. Amortized cost excludes accrued interest receivable of $233 thousand and $368 thousand at September 30, 2021, and December 31, 2020, respectively. Transfers and Sales of Available-for-Sale Securities and Held-to-Maturity Securities During the first and third quarters of 2020, we sold held-to-maturity private-label MBS that had less than 15 percent of the acquired principal outstanding at the time of the sale. Such sales are treated as maturities for the purposes of security classification. The sale does not impact our ability and intent to hold the remaining investments classified as held-to-maturity through their stated maturity dates. Additionally, during the third quarter of 2020 we adopted a provision of the Accounting Standards Update titled Facilitation of the Effects of Reference Rate Reform on Financial Reporting which provides a one-time election to sell, transfer, or both sell and transfer debt securities classified as held-to-maturity that reference a rate affected by reference rate reform and that were classified as held-to-maturity before January 1, 2020. Table 3.7 - Transfer of Held-to-Maturity Securities to Available-for-Sale Securities in Third Quarter 2020 (dollars in thousands) Amortized Cost Allowance for Credit Losses Other-Than-Temporary Impairment Recognized in Accumulated Other Comprehensive Loss Carrying Value Gross Unrecognized Holding Gains Gross Unrecognized Holding Losses Fair Value HFA securities $ 77,470 $ — $ — $ 77,470 $ — $ (6,230) $ 71,240 MBS GSE – single-family 17,802 — — 17,802 89 — 17,891 MBS - Private-label 158,945 (634) (31,502) 126,809 53,953 (248) 180,514 Total $ 254,217 $ (634) $ (31,502) $ 222,081 $ 54,042 $ (6,478) $ 269,645 Gains and Losses on Sales. We compute gains and losses on sales of investment securities using the specific identification method and include these gains and losses in other income (loss). The following table summarizes the proceeds from sale and gains and losses on sales of securities for the three and nine months ended September 30, 2021 and 2020. Table 3.8 - Proceeds and Gains (Losses) from Sales of Investment Securities (dollars in thousands) For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 Available-for-Sale Securities Proceeds from sale $ — $ 165,439 $ — $ 165,439 Amortized cost, net of allowance for credit losses — 139,229 — 139,229 Gross realized gains from sale $ — $ 26,438 $ — $ 26,438 Gross realized losses from sale — (228) — (228) Realized net gain from sale $ — $ 26,210 $ — $ 26,210 Held-to-Maturity Securities Proceeds from sale $ — $ 101,107 $ — $ 262,850 Less: Carrying value — 75,522 — 176,293 Less: Noncredit losses recorded in accumulated other comprehensive income — 18,905 — 39,144 Realized net gain from sale $ — $ 6,680 $ — $ 47,413 Allowance for Credit Losses on Available-for-Sale Securities and Held-to-Maturity Securities We evaluate available-for-sale and held-to-maturity investment securities for credit losses on a quarterly basis. Our available-for-sale and held-to-maturity securities are principally debt securities of GSE or U.S. government-owned corporations, supranational institutions, and state or local housing finance agency obligations, and MBS issued by Government National Mortgage Association (Ginnie Mae), Federal Home Loan Mortgage Corporation (Freddie Mac), and Federal National Mortgage Association (Fannie Mae) that are backed by single-family or multifamily mortgage loans. We only purchase investment-grade securities. At September 30, 2021, all available-for-sale securities and held-to-maturity securities, based on amortized cost, were rated single-A, or above, by an NRSRO, based on the lowest long-term credit rating for each security. We evaluate our individual available-for-sale securities for impairment by comparing the security’s fair value to its amortized cost. Impairment may exist when the fair value of the investment is less than its amortized cost (i.e. in an unrealized loss position). At September 30, 2021, certain available-for-sale securities were in an unrealized loss position. These losses are considered temporary as we expect to recover the entire amortized cost basis on these available-for-sale investment securities and we neither intend to sell these securities nor do we consider it more likely than not that we will be required to sell these securities before the anticipated recovery of each security's remaining amortized cost basis. Further, we have not experienced any payment defaults on the instruments. In addition, substantially all of these securities carry an implicit or explicit government guarantee. As a result, no allowance for credit losses was recorded on available-for-sale securities at September 30, 2021. See Table 3.9 below for the allowance for credit losses on available-for-sale securities at September 30, 2020. We evaluate our held-to-maturity securities for impairment on a collective or pooled basis unless an individual assessment is deemed necessary because the securities do not possess similar risk characteristics. As of September 30, 2021, we had not established an allowance for credit losses on any of our held-to-maturity securities because the securities: (1) were all highly-rated and/or had short remaining terms to maturity, (2) had not experienced, nor do we expect to experience, any payment default on the instruments, and (3) in the case of U.S. or GSE obligations, carry an implicit or explicit government guarantee such that we consider the risk of nonpayment to be zero. See Table 3.9 below for the allowance for credit losses on held-to-maturity securities at September 30, 2020. Table 3.9 - Allowance for Credit Losses on Debt Securities (dollars in thousands) For the Three Months Ended September 30, 2020 For the Nine Months Ended September 30, 2020 Available-for-Sale Held-to-Maturity Available-for-Sale Held-to-Maturity Balance at beginning of period $ — $ 5,566 $ — $ — Adjustments for cumulative effect of change in accounting principle (1) — — — 5,308 Transfers 634 (634) 634 (634) Reduction of provision for credit losses due to sales of securities (68) (2,423) (68) (3,205) Reduction of provision for credit losses (143) (2,509) (143) (1,469) Charge-offs (299) — (299) — Balance at end of period $ 124 $ — $ 124 $ — _________________________ (1) We adopted new accounting guidance for the measurement of credit losses on financial instruments on January 1, 2020. See Item 8 — Financial Statements and Supplementary Data — Notes to Financial Statements — Note 3 — Recently Issued and Adopted Accounting Guidance in the 2020 Annual Report for information on the adoption of Financial Instruments - Credit Losses. Upon adoption of this new accounting guidance, we recorded through a cumulative effect adjustment to retained earnings an increase in the allowance for credit losses associated with held-to-maturity private-label MBS totaling $5.3 million.

Advances

Advances	9 Months Ended
Advances	Sep. 30, 2021
Advances [Abstract]
Federal Home Loan Bank, Advances [Text Block]	Advances General Terms. At both September 30, 2021, and December 31, 2020, we had advances outstanding with interest rates ranging from 0.00 percent to 7.72 percent. Table 4.1 - Advances Outstanding by Year of Contractual Maturity (dollars in thousands) September 30, 2021 December 31, 2020 Amount Weighted Amount Weighted Overdrawn demand-deposit accounts $ 97 0.59 % $ 135 0.62 % Due in one year or less 5,443,617 1.02 9,090,900 1.00 Due after one year through two years 2,106,482 2.17 2,281,047 1.78 Due after two years through three years 1,630,633 1.85 2,014,880 2.37 Due after three years through four years 2,372,177 1.29 1,685,056 1.79 Due after four years through five years 1,262,211 1.42 2,687,456 1.34 Thereafter 1,200,358 2.08 945,038 2.38 Total par value 14,015,575 1.46 % 18,704,512 1.43 % Premiums 888 2,248 Discounts (36,332) (37,592) Fair value of bifurcated derivatives (1) 29,155 44,534 Hedging adjustments 47,705 103,300 Total (2) $ 14,056,991 $ 18,817,002 _________________________ (1) At September 30, 2021, and December 31, 2020, we had certain advances with embedded features that met the requirements to be separated from the host contract and designated as stand-alone derivatives. (2) Excludes accrued interest receivable of $21.5 million and $25.8 million at September 30, 2021, and December 31, 2020, respectively. We offer advances to members and eligible nonmembers that provide the borrower the right, based upon predetermined option exercise dates, to repay the advance prior to maturity without incurring prepayment or termination fees (callable advances). We also offer certain floating-rate advances that may be contractually prepaid by the borrower on a floating-rate reset date without incurring prepayment or termination fees. Other advances may only be prepaid by paying a fee (prepayment fee) that makes us financially indifferent to the prepayment of the advance. Table 4.2 - Advances Outstanding by Year of Contractual Maturity or Next Call Date (dollars in thousands) September 30, 2021 December 31, 2020 Overdrawn demand-deposit accounts $ 97 $ 135 Due in one year or less 6,505,792 10,149,975 Due after one year through two years 1,920,782 2,095,247 Due after two years through three years 1,388,558 1,809,880 Due after three years through four years 2,255,177 1,392,981 Due after four years through five years 758,511 2,335,956 Thereafter 1,186,658 920,338 Total par value $ 14,015,575 $ 18,704,512 We currently hold putable advances that provide us with the right to require repayment prior to maturity of the advance (and thereby extinguish the advance) on predetermined exercise dates (put dates). Generally, we would exercise the put options when interest rates increase relative to contractual rates. Table 4.3 - Advances Outstanding by Year of Contractual Maturity or Next Put Date (dollars in thousands) September 30, 2021 December 31, 2020 Overdrawn demand-deposit accounts $ 97 $ 135 Due in one year or less 7,036,042 10,755,575 Due after one year through two years 1,320,482 2,201,797 Due after two years through three years 1,524,633 1,224,380 Due after three years through four years 1,785,252 1,593,056 Due after four years through five years 1,195,211 2,059,531 Thereafter 1,153,858 870,038 Total par value $ 14,015,575 $ 18,704,512 Table 4.4 - Advances by Current Interest Rate Terms (dollars in thousands) September 30, 2021 December 31, 2020 Fixed-rate $ 11,977,103 $ 16,742,602 Variable-rate 2,038,472 1,961,910 Total par value $ 14,015,575 $ 18,704,512 Credit Risk Exposure and Security Terms. Our advances are primarily made to member financial institutions, including commercial banks, insurance companies, savings institutions, and credit unions. We manage our credit exposure to secured member credit products through an integrated approach that generally includes establishing a credit limit for each borrower. This approach includes an ongoing review of each borrower's financial condition, and collateral and lending policies that are intended to limit risk of loss while balancing borrowers' needs for a reliable source of funding. For additional information on credit risk exposure and security terms see Part II — Item 8 — Financial Statements and Supplementary Data — Note 6 — Advances in the 2020 Annual Report. Using a risk-based approach and taking into consideration each borrower's financial strength, we consider the types and level of collateral to be the primary indicator of credit quality on our credit products. At September 30, 2021, and December 31, 2020, we had rights to collateral, on a borrower-by-borrower basis, with an estimated value in excess of our outstanding extensions of credit. We continue to evaluate and make changes to our collateral guidelines based on market conditions. At September 30, 2021, and December 31, 2020, none of our advances were past due, on nonaccrual status, or considered impaired. In addition, there were no troubled debt restructurings related to advances during the nine months ended September 30, 2021 and 2020. Based upon the collateral held as security, our credit extension and collateral policies, management's credit analysis, and the repayment history on advances, we have not recorded any allowance for credit losses on our advances at September 30, 2021, and December 31, 2020. Prepayment Fees. Table 4.5 - Advances Prepayment Fees (dollars in thousands) For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 Prepayment fees received from borrowers $ 6,370 $ 5,834 $ 20,515 $ 13,737 Hedging fair-value adjustments on prepaid advances (1,172) (64) (2,108) (2,961) Net discount (premiums) associated with prepaid advances 112 (124) (1,132) (128) Advance prepayment fees recognized in income, net $ 5,310 $ 5,646 $ 17,275 $ 10,648

Mortgage Loans Held for Portfol

Mortgage Loans Held for Portfolio	9 Months Ended
Mortgage Loans Held for Portfolio	Sep. 30, 2021
Receivables [Abstract]
Mortgage Loans Held for Portfolio [Text Block]	Mortgage Loans Held for Portfolio We invest in mortgage loans through the Mortgage Partnership Finance® (MPF®) program. These mortgage loans are either guaranteed or insured by federal agencies, as is the case with government mortgage loans, or are credit-enhanced, directly or indirectly, by the related entity that sold the loan (a participating financial institution), as is the case with conventional mortgage loans. All such investments are held for portfolio. Table 5.1 - Mortgage Loans Held for Portfolio (dollars in thousands) September 30, 2021 December 31, 2020 Real estate Fixed-rate 15-year single-family mortgages $ 297,104 $ 322,713 Fixed-rate 20- and 30-year single-family mortgages 2,936,183 3,547,994 Premiums 50,990 60,050 Discounts (761) (1,094) Deferred derivative gains, net 2,464 3,689 Total mortgage loans held for portfolio (1) 3,285,980 3,933,352 Less: allowance for credit losses (2,055) (3,100) Total mortgage loans, net of allowance for credit losses $ 3,283,925 $ 3,930,252 ________________________ (1) Excludes accrued interest receivable of $16.0 million and $19.3 million at September 30, 2021, and December 31, 2020, respectively. Table 5.2 - Mortgage Loans Held for Portfolio by Collateral/Guarantee Type (dollars in thousands) September 30, 2021 December 31, 2020 Conventional mortgage loans $ 3,030,709 $ 3,624,557 Government mortgage loans 202,578 246,150 Total par value $ 3,233,287 $ 3,870,707 Credit-Enhancements. Our allowance for credit losses factors in the credit-enhancements associated with conventional mortgage loans under the MPF program. These credit-enhancements apply after the homeowner's equity is exhausted and can include primary and/or supplemental mortgage insurance or other kinds of credit-enhancement. The credit risk analysis of our conventional loans is performed at the individual master commitment level to determine the credit-enhancements available to recover losses on loans under each individual master commitment. For additional information on credit enhancements see Part II — Item 8 — Financial Statements and Supplementary Data — Note 7 — Mortgage Loans Held for Portfolio — Credit-Enhancements in the 2020 Annual Report. Relief to Borrowers During the COVID-19 Pandemic. We have elected to apply Section 4013 of the Coronavirus Aid, Relief, and Economic Security Act (CARES Act) to our loan modifications that qualify under the CARES Act. As a result, we have elected to suspend troubled debt restructuring accounting for eligible modifications under Section 4013 of the CARES Act. As of September 30, 2021, we had $24.5 million of these modifications outstanding. See Part II — Item 8 — Financial Statements and Supplementary Data — Note 2 — Summary of Significant Accounting Policies in the 2020 Annual Report for additional information. Servicers of our mortgage loans may grant a forbearance period to borrowers who have requested forbearance based on COVID-19 related difficulties so long as the loan is current or no more than 31 days delinquent at the time of the request. We continue to apply our accounting policy for past due loans and charge-offs to loans during the forbearance period unless there is a legal modification made to update the terms of the mortgage loan contract. The accrual status for loans under forbearance will be driven by the past due status of the loan based on its contractual terms. As of September 30, 2021, we held approximately $21.1 million in par value of conventional mortgage loans that were in a forbearance plan as a result of COVID-19. Of these loans, $3.0 million had a current payment status, $2.2 million were 30 to 59 days past due, $2.3 million were 60 to 89 days past due, and $13.6 million were greater than 90 days past due and in nonaccrual status. The $21.1 million of conventional mortgage loans in forbearance represents 0.6 percent of our mortgage loans held for portfolio at September 30, 2021. In addition, we had approximately $4.3 million in par value of government mortgage loans in a forbearance plan as a result of COVID-19. Payment Status of Mortgage Loans. Payment status is a key credit quality indicator for conventional mortgage loans and allows us to monitor the migration of past due loans. Past due loans are those where the borrower has failed to make timely payments of principal and/or interest in accordance with the terms of the loan. Other delinquency statistics include nonaccrual loans and loans in process of foreclosure. Tables 5.3 and 5.4 present the payment status for conventional mortgage loans and other delinquency statistics for all mortgage loans at September 30, 2021, and December 31, 2020. Table 5.3 - Credit Quality Indicator for Conventional Mortgage Loans (dollars in thousands) September 30, 2021 Year of Origination Payment Status at Amortized Cost Prior to 2017 2017 to 2021 Total Past due 30-59 days delinquent $ 8,528 $ 10,052 $ 18,580 Past due 60-89 days delinquent 3,109 947 4,056 Past due 90 days or more delinquent 12,284 11,802 24,086 Total past due 23,921 22,801 46,722 Total current loans 1,246,591 1,786,178 3,032,769 Total mortgage loans $ 1,270,512 $ 1,808,979 $ 3,079,491 December 31, 2020 Year of Origination Payment Status at Amortized Cost Prior to 2016 2016 to 2020 Total Past due 30-59 days delinquent $ 11,743 $ 25,058 $ 36,801 Past due 60-89 days delinquent 5,263 11,178 16,441 Past due 90 days or more delinquent 20,894 43,529 64,423 Total past due 37,900 79,765 117,665 Total current loans 1,246,691 2,317,975 3,564,666 Total mortgage loans $ 1,284,591 $ 2,397,740 $ 3,682,331 Table 5.4 - Other Delinquency Statistics of Mortgage Loans (dollars in thousands) September 30, 2021 Amortized Cost in Conventional Mortgage Loans Amortized Cost in Government Mortgage Loans Total In process of foreclosure (1) $ 367 $ 1,008 $ 1,375 Serious delinquency rate (2) 0.80 % 3.11 % 0.94 % Past due 90 days or more still accruing interest $ — $ 5,410 $ 5,410 Loans on nonaccrual status (3) $ 24,540 $ 1,090 $ 25,630 December 31, 2020 Amortized Cost in Conventional Mortgage Loans Amortized Cost in Government Mortgage Loans Total In process of foreclosure (1) $ 1,762 $ 1,041 $ 2,803 Serious delinquency rate (2) 1.75 % 6.04 % 2.02 % Past due 90 days or more still accruing interest $ — $ 5,592 $ 5,592 Loans on nonaccrual status (4) $ 65,039 $ 10,101 $ 75,140 _______________________ (1) Includes loans where the decision of foreclosure or similar alternative such as pursuit of deed-in-lieu of foreclosure has been reported. (2) Loans that are 90 days or more past due or in the process of foreclosure expressed as a percentage of the recorded investment in the total loan portfolio class. (3) As of September 30, 2021, the conventional and government mortgage loans on nonaccrual status that did not have an associated allowance for credit losses amounted to $13.6 million and $1.1 million, respectively. (4) As of December 31, 2020, the conventional and government mortgage loans on nonaccrual status that did not have an associated allowance for credit losses amounted to $31.8 million and $10.1 million, respectively. Allowance for Credit Losses for Mortgage Loans. Conventional Mortgage Loans. Using Financial Instruments - Credit Losses accounting guidance, conventional loans are evaluated collectively when similar risk characteristics exist. Conventional loans that do not share risk characteristics with other pools are evaluated for expected credit losses on an individual basis. We determine our allowance for credit losses on conventional loans through analyses that include consideration of various loan portfolio and collateral-related characteristics, such as past performance, current conditions, and reasonable and supportable forecasts of expected economic conditions. We use a discounted cash flow model to project our expected losses. We use a third-party model to project cash flows to estimate the expected credit losses over the life of the loans. The model relies on a number of inputs, such as both current and forecasted property values and interest rates as well as historical borrower behavior. We incorporate associated credit enhancements and expected recoveries, if any, to determine our estimate of expected credit losses. Certain conventional loans may be evaluated for credit losses by using the practical expedient for collateral dependent assets. A mortgage loan is considered collateral dependent if repayment is expected to be provided by the sale of the underlying property, that is, if it is considered likely that the borrower will default. We estimate the fair value of this collateral by using a third-party property valuation model. The expected credit loss of a collateral dependent mortgage loan is equal to the difference between the amortized cost of the loan and the estimated fair value of the collateral, less estimated selling costs. We will reserve for these estimated losses or record a direct charge-off of the loan balance if certain triggering criteria are met. Table 5.5 presents a roll forward of the allowance for credit losses on conventional mortgage loans for the three and nine months ended September 30, 2021 and 2020. Table 5.5 - Allowance for Credit Losses on Conventional Mortgage Loans (dollars in thousands) For the Three Months Ended September 30, For the Nine Months Ended September 30, Allowance for credit losses (1) 2021 2020 2021 2020 Balance, beginning of period $ 2,125 $ 4,602 $ 3,100 $ 500 Adjustment for cumulative effect of change in accounting principle — — — 2,221 Recoveries (charge-offs) 10 (3) 62 (83) (Reduction of) provision for credit losses (80) 1 (1,107) 1,962 Balance, end of period $ 2,055 $ 4,600 $ 2,055 $ 4,600 _________________________ (1) These amounts exclude government mortgage loans because we make no allowance for credit losses based on our investments in government mortgage loans, as discussed below under — Government Mortgage Loans Held for Portfolio. Government Mortgage Loans Held for Portfolio. We invest in government mortgage loans secured by one- to four-family residential properties. Government mortgage loans are mortgage loans insured or guaranteed by the Federal Housing Administration (the FHA), the U.S. Department of Veterans Affairs (the VA), the Rural Housing Service of the U.S. Department of Agriculture (RHS), or by the U.S. Department of Housing and Urban Development (HUD). The servicer provides and maintains insurance or a guarantee from the applicable government agency. The servicer is responsible for compliance with all government agency requirements and for obtaining the benefit of the applicable insurance or guaranty with respect to defaulted government-guaranteed mortgage loans. Any losses incurred on these loans that are not recovered from the insurer or guarantor are absorbed by the related servicer. Therefore, we only have credit risk for these loans if the servicer fails to pay for losses not covered by insurance or guarantees. Due to government guarantees or insurance on our government loans, there is no allowance for credit losses for the government mortgage loan portfolio as of September 30, 2021, and December 31, 2020. Additionally, government mortgage loans, other than government mortgage loans that have been granted temporary forbearance, are not placed on nonaccrual status due to the government guarantee or insurance on these loans and the contractual obligation of the loan servicers to repurchase their related loans when certain criteria are met.

Derivatives and Hedging Activit

Derivatives and Hedging Activities	9 Months Ended
Derivatives and Hedging Activities	Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Hedging Activities [Text Block]	Derivatives and Hedging Activities Table 6.1 - Fair Value of Derivative Instruments (dollars in thousands) September 30, 2021 December 31, 2020 Notional Derivative Derivative Notional Derivative Derivative Derivatives designated as hedging instruments Interest-rate swaps $ 25,284,371 $ 6,008 $ (82,585) $ 9,960,475 $ 6,044 $ (41,000) Forward-start interest-rate swaps 1,391,000 — (376) 17,000 — (14) Total derivatives designated as hedging instruments 26,675,371 6,008 (82,961) 9,977,475 6,044 (41,014) Derivatives not designated as hedging instruments Interest-rate swaps 2,394,800 3,410 (31,890) 5,536,822 3,918 (47,756) CO bond firm commitments 75,000 296 — — — — Mortgage-delivery commitments (1) 8,019 47 (16) 28,386 220 — Total derivatives not designated as hedging instruments 2,477,819 3,753 (31,906) 5,565,208 4,138 (47,756) Total notional amount of derivatives $ 29,153,190 $ 15,542,683 Total derivatives before netting and collateral adjustments 9,761 (114,867) 10,182 (88,770) Netting adjustments and cash collateral, including related accrued interest (2) 346,500 93,466 151,056 64,708 Derivative assets and derivative liabilities $ 356,261 $ (21,401) $ 161,238 $ (24,062) _______________________ (1) Mortgage-delivery commitments are classified as derivatives with changes in fair value recorded in other income. (2) Amounts represent the effect of master-netting agreements intended to allow us to settle positive and negative positions with the same counterparty. Cash collateral including accrued interest posted was $440.0 million and $215.8 million at September 30, 2021, and December 31, 2020, respectively. The change in cash collateral posted is included in the net change in interest-bearing deposits in the statement of cash flows. There was no cash collateral and related accrued interest received at September 30, 2021, and December 31, 2020. Changes in fair value of the derivative hedging instrument and the hedged item attributable to the hedged risk for designated fair-value hedges are recorded in net interest income in the same line as the earnings effect of the hedged item. For designated cash-flow hedges, the entire change in the fair value of the hedging instrument (assuming it is included in the assessment of hedge effectiveness) is reported in other comprehensive income until the hedged transaction affects earnings. At that time, this amount is reclassified from other comprehensive income and recorded in net interest income in the same line as the earnings effect of the hedged item. Table 6.2 presents the net gains (losses) on qualifying fair-value hedging relationships. Gains (losses) on derivatives include unrealized changes in fair value as well as net interest settlements. Table 6.2 - Net Gains (Losses) on Fair Value Hedging Relationships (dollars in thousands) For the Three Months Ended September 30, 2021 Advances Available-for-sale Securities CO Bonds Total interest income (expense) in the statements of operations $ 40,864 $ 18,901 $ (48,861) Gains (losses) on hedging relationships Changes in fair value: Derivatives $ 13,855 $ 68,669 $ (24,570) Hedged items (13,691) (65,848) 24,739 Net changes in fair value before price alignment interest 164 2,821 169 Price alignment interest (1) 3 11 (1) Net interest settlements on derivatives (2)(3) (15,531) (32,980) 20,442 Net (losses) gains on qualifying hedging relationships (15,364) (30,148) 20,610 Amortization/accretion of discontinued hedging relationships (363) — (847) Net (losses) gains on derivatives and hedging activities recorded in net interest income $ (15,727) $ (30,148) $ 19,763 For the Three Months Ended September 30, 2020 Advances Available-for-sale Securities CO Bonds Total interest income (expense) in the statements of operations $ 71,218 $ 17,495 $ (82,962) Gains (losses) on hedging relationships Changes in fair value: Derivatives $ 23,278 $ 46,086 $ (15,306) Hedged items (22,865) (44,264) 15,032 Net changes in fair value before price alignment interest 413 1,822 (274) Price alignment interest (1) 38 139 (11) Net interest settlements on derivatives (2)(3) (18,663) (20,361) 7,625 Net gains (losses) on qualifying hedging relationships (18,212) (18,400) 7,340 Amortization/accretion of discontinued hedging relationships (383) — (984) Net (losses) gains on derivatives and hedging activities recorded in net interest income $ (18,595) $ (18,400) $ 6,356 For the Nine Months Ended September 30, 2021 Advances Available-for-sale Securities CO Bonds Total interest income (expense) in the statements of operations $ 133,646 $ 52,737 $ (164,146) Gains (losses) on hedging relationships Changes in fair value: Derivatives $ 54,752 $ 196,187 $ (92,427) Hedged items (53,831) (189,916) 92,898 Net changes in fair value before price alignment interest 921 6,271 471 Price alignment interest (1) 19 76 (4) Net interest settlements on derivatives (2)(3) (47,398) (84,764) 43,912 Net (losses) gains on qualifying hedging relationships (46,458) (78,417) 44,379 Amortization/accretion of discontinued hedging relationships (1,767) — (2,249) Net (losses) gains on derivatives and hedging activities recorded in net interest income $ (48,225) $ (78,417) $ 42,130 For the Nine Months Ended September 30, 2020 Advances Available-for-sale Securities CO Bonds Total interest income (expense) in the statements of operations $ 340,695 $ 46,993 $ (300,765) Gains (losses) on hedging relationships Changes in fair value: Derivatives $ (106,522) $ (341,805) $ 42,327 Hedged items 105,204 333,919 (43,793) Net changes in fair value before price alignment interest (1,318) (7,886) (1,466) Price alignment interest (1) 452 1,259 (196) Net interest settlements on derivatives (2)(3) (35,971) (49,918) 17,621 Net (losses) gains on qualifying hedging relationships (36,837) (56,545) 15,959 Amortization/accretion of discontinued hedging relationships (1,213) — (2,819) Net (losses) gains on derivatives and hedging activities recorded in net interest income $ (38,050) $ (56,545) $ 13,140 _______________________ (1) Relates to derivatives for which variation margin payments are characterized as daily settled contracts. (2) Represents interest income/expense on derivatives in qualifying fair-value hedging relationships. Net interest settlements on derivatives that are not in qualifying fair-value hedging relationships are reported in other income. (3) Excludes the interest income/expense of the respective hedged items recorded in net interest income. Table 6.3 presents the net gains (losses) on qualifying cash flow hedging relationships. Table 6.3 - Net Gains (Losses) on Cash Flow Hedging Relationships (dollars in thousands) For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 Forward-start interest rate swaps - CO Bonds Losses reclassified from accumulated other comprehensive income into interest expense $ (1,453) $ (1,788) $ (4,516) $ (5,318) Gains (losses) recognized in other comprehensive income 8,672 15 (366) (1,264) For the nine months ended September 30, 2021, and 2020, there were no reclassifications from accumulated other comprehensive income into earnings as a result of the discontinuance of cash-flow hedges because the original forecasted transactions were not expected to occur by the end of the originally specified time period or within a two-month period thereafter. As of September 30, 2021, the maximum length of time over which we are hedging our exposure to the variability in future cash flows for forecasted transactions is ten years. As of September 30, 2021, the amount of deferred net losses on derivatives accumulated in other comprehensive income related to cash flow hedges expected to be reclassified to earnings during the next 12 months is $5.7 million. Table 6.4 - Cumulative Basis Adjustments for Fair-Value Hedges (dollars in thousands) September 30, 2021 Line Item in Statement of Condition Amortized Cost of Hedged Asset/ Liability (1) Basis Adjustments for Active Hedging Relationships Included in Amortized Cost Basis Adjustments for Discontinued Hedging Relationships Included in Amortized Cost Cumulative Amount of Fair Value Hedging Basis Adjustments Advances $ 3,707,970 $ 66,188 $ 10,672 $ 76,860 Available-for-sale securities 10,115,287 306,503 — 306,503 Consolidated obligation bonds 11,688,992 (70,193) 36,965 (33,228) _______________________ (1) Includes only the portion of amortized cost representing the hedged items in fair-value hedging relationships. Table 6.5 - Net Gains and Losses on Derivatives and Hedging Activities (dollars in thousands) For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 Derivatives not designated as hedging instruments: Economic hedges: Interest-rate swaps $ (785) $ 1,201 $ (778) $ (53,171) CO bond firm commitments 302 — 321 — Mortgage-delivery commitments 94 409 (339) 979 Total net (losses) gains related to derivatives not designated as hedging instruments (389) 1,610 (796) (52,192) Other (1) 2 14 8 97 Net (losses) gains on derivatives $ (387) $ 1,624 $ (788) $ (52,095) ______________________ (1) Consists of price alignment amount on derivatives for which variation margin is characterized as a daily settlement amount. Managing Credit Risk on Derivatives. We enter into derivatives that we clear (cleared derivatives) with a derivatives clearing organization (DCO), our counterparty for such derivatives. We also enter into derivatives that are not cleared (uncleared derivatives) under master-netting agreements. Currently derivatives that contain any optionality are not eligible for clearing. Accordingly, such derivatives, including the derivatives used to hedge issuance of callable CO bonds, are executed with our uncleared derivatives counterparties. Certain of our uncleared derivatives master-netting agreements contain provisions that require us to post additional collateral with our uncleared derivatives counterparties if our credit ratings are lowered. Under the terms that govern such agreements, if our credit rating is lowered by Moody's or S&P to a certain level, we are required to deliver additional collateral on uncleared derivatives. In the event of a split between such credit ratings, the lower rating governs. The aggregate fair value of all uncleared derivatives with these provisions that were in a net-liability position (before cash collateral and related accrued interest) at September 30, 2021, was $101.4 million for which we had delivered collateral with a post-haircut value of $99.2 million in accordance with the terms of the master-netting agreements. Securities collateral is subject to valuation haircuts in accordance with the terms of the master-netting arrangements. Table 6.6 sets forth the post-haircut value of incremental collateral that certain uncleared derivatives counterparties could have required us to deliver based on incremental credit rating downgrades at September 30, 2021. Table 6.6 - Post Haircut Value of Incremental Collateral to be Delivered as of September 30, 2021 (dollars in thousands) Ratings Downgrade (1) From To Incremental Collateral AA+ AA or AA- $ — AA- A+, A or A- — A- below A- 27,758 _______________________ (1) Ratings are expressed in this table according to S&P's conventions but include the equivalent of such rating by Moody's. If there is a split rating, the lower rating is used. For cleared derivatives, the DCO is our counterparty. The DCO notifies the clearing member of the required initial and variation margin and our agent (clearing member) in turn notifies us. We utilize one of two DCOs for each cleared derivative transaction, Chicago Mercantile Exchange Inc. (CME Inc.) or LCH Limited (LCH Ltd.). Based upon their rulebooks, we characterize variation margin payments as daily settlement payments, rather than as collateral. At both DCOs, posted initial margin is considered collateral. We post initial margin and exchange variation margin through a clearing member of the DCO, which clears our trades, acts as our agent to the DCO and guarantees our performance to the DCO, subject to the terms of relevant agreements. These arrangements expose us to credit risk in the event that one of our clearing members or one of the DCOs fails to meet its obligations. The use of cleared derivatives is intended to mitigate credit risk exposure because the DCO, which is fully secured at all times through margin received from its clearing members, is substituted for the credit risk exposure of individual counterparties in uncleared derivatives, and collateral is posted at least once daily for changes in the fair value of cleared derivatives through a clearing member. For cleared derivatives, the DCO determines initial margin requirements. Our clearing members, which are CFTC-registered futures commission merchants may require us to post margin in excess of DCO requirements based on our credit or other considerations, including but not limited to, credit rating downgrades. We were not required to post any such excess margin by our clearing members based on credit or any other considerations at September 30, 2021. Offsetting of Certain Derivatives. We present derivatives, any related cash collateral received or pledged, and associated accrued interest, on a net basis by counterparty. We have analyzed the rights, rules, and regulations governing our cleared and uncleared derivatives and determined that those rights, rules, and regulations should result in a net claim with each of our counterparties (which, in the context of cleared derivatives is through each of our clearing members with the related DCO) upon an event of default of our counterparty (solely in the case of uncleared derivatives) or the bankruptcy, insolvency or a similar proceeding involving our counterparty (and/or one of our clearing members, in the case of cleared derivatives). For this purpose, "net claim" generally means a single net amount reflecting the aggregation of all amounts owed by us to the relevant counterparty and payable to us from the relevant counterparty. Table 6.7 presents separately the fair value of derivatives that are subject to netting due to a legal right of offset based on the terms of our master netting arrangements or similar agreements as of September 30, 2021, and December 31, 2020, and the fair value of derivatives that are not subject to such netting. Derivatives subject to netting include any related cash collateral received from or pledged to counterparties. Table 6.7 - Netting of Derivative Assets and Derivative Liabilities (dollars in thousands) September 30, 2021 Derivative Instruments Meeting Netting Requirements Derivative Instruments Not Meeting Netting Requirements Total Derivative Assets and Total Derivative Liabilities Non-cash Collateral (Received) or Pledged Not Offset (2) Gross Recognized Amount Gross Amounts of Netting Adjustments (1) Net Amount Derivative Assets Interest-rate swaps Uncleared $ 5,785 $ (4,496) $ 1,289 $ — $ 1,289 Cleared 3,633 350,996 354,629 — 354,629 CO bond firm commitment $ 296 296 296 Mortgage delivery commitment 47 47 47 Total $ 356,261 $ 356,261 Derivative Liabilities Interest-rate swaps Uncleared $ (107,219) $ 85,834 $ (21,385) $ 17,220 $ (4,165) Cleared (7,632) 7,632 — — — Mortgage delivery commitment $ (16) (16) (16) Total $ (21,401) $ (4,181) December 31, 2020 Derivative Instruments Meeting Netting Requirements Derivative Instruments Not Meeting Netting Requirements Total Derivative Assets and Total Derivative Liabilities Non-cash Collateral (Received) or Pledged Not Offset (2) Gross Recognized Amount Gross Amounts of Netting Adjustments (1) Net Amount Derivative Assets Interest-rate swaps Uncleared $ 5,215 $ (4,899) $ 316 $ — $ 316 Cleared 4,747 155,955 160,702 — 160,702 Mortgage delivery commitment $ 220 220 220 Total $ 161,238 $ 161,238 Derivative Liabilities Interest-rate swaps Uncleared $ (82,625) $ 58,563 $ (24,062) $ 23,087 $ (975) Cleared (6,145) 6,145 — — — Total $ (24,062) $ (975) _______________________ (1) Includes gross amounts of netting adjustments and cash collateral. (2) Includes non-cash collateral at fair value that cannot be sold or repledged by the counterparty. Additionally, any overcollateralization with a counterparty is not included in the determination of the net amount. At September 30, 2021,

Deposits

Deposits	9 Months Ended
Deposits	Sep. 30, 2021
Deposits [Abstract]
Deposits [Text Block]	Deposits We offer demand and overnight deposits for members and qualifying nonmembers and, prior to February 19, 2021, we offered term deposits to our members. Members that service mortgage loans may deposit funds collected in connection with mortgage loans pending disbursement of such funds to the owners of the mortgage loans, which we classify as "other" in the following table. Table 7.1 - Deposits (dollars in thousands) September 30, 2021 December 31, 2020 Interest-bearing Demand and overnight $ 901,388 $ 975,469 Other 1,882 2,525 Noninterest-bearing Other 67,462 110,993 Total deposits $ 970,732 $ 1,088,987

Consolidated Obligations

Consolidated Obligations	9 Months Ended
Consolidated Obligations	Sep. 30, 2021
Debt Disclosure [Abstract]
Consolidated Obligations [Text Block]	Consolidated Obligations CO Bonds. CO bonds for which we have received issuance proceeds and are primarily liable were as follows: Table 8.1 - CO Bonds Outstanding by Contractual Maturity (dollars in thousands) September 30, 2021 December 31, 2020 Amount Weighted Average Rate (1) Amount Weighted Average Rate (1) Due in one year or less $ 6,855,555 0.79 % $ 10,608,465 0.81 % Due after one year through two years 3,197,000 1.25 3,956,120 1.35 Due after two years through three years 2,475,105 1.45 1,569,315 2.20 Due after three years through four years 2,941,270 0.95 1,141,430 2.43 Due after four years through five years 5,398,465 0.87 1,776,100 1.12 Thereafter 4,225,785 2.06 2,312,155 3.58 Total par value 25,093,180 1.16 % 21,363,585 1.42 % Premiums 47,269 58,537 Discounts (9,752) (12,278) Hedging adjustments (33,228) 61,746 Total $ 25,097,469 $ 21,471,590 _______________________ (1) The CO bonds' weighted-average rate excludes concession fees. Table 8.2 - CO Bonds Outstanding by Call Feature (dollars in thousands) September 30, 2021 December 31, 2020 Noncallable and nonputable $ 14,401,180 $ 19,668,585 Callable 10,692,000 1,695,000 Total par value $ 25,093,180 $ 21,363,585 Table 8.3 - CO Bonds Outstanding by Contractual Maturity or Next Call Date (dollars in thousands) September 30, 2021 December 31, 2020 Due in one year or less $ 17,007,555 $ 11,728,465 Due after one year through two years 3,599,000 4,046,120 Due after two years through three years 1,255,105 1,629,315 Due after three years through four years 1,551,270 1,011,430 Due after four years through five years 599,465 1,501,100 Thereafter 1,080,785 1,447,155 Total par value $ 25,093,180 $ 21,363,585 Table 8.4 - CO Bonds by Interest Rate-Payment Type (dollars in thousands) September 30, 2021 December 31, 2020 Fixed-rate $ 16,612,180 $ 12,524,585 Simple variable-rate 4,903,000 8,549,000 Step-up (1) 3,578,000 290,000 Total par value $ 25,093,180 $ 21,363,585 _______________________ (1) Step-up bonds pay interest at increasing fixed rates for specified intervals over the life of the CO bond and can be called at our option on the step-up dates. CO Discount Notes. Outstanding CO discount notes for which we were primarily liable, all of which are due within one year, were as follows: Table 8.5 - CO Discount Notes Outstanding (dollars in thousands) Book Value Par Value Weighted Average Rate (1) September 30, 2021 $ 5,554,103 $ 5,554,519 0.04 % December 31, 2020 $ 12,878,310 $ 12,879,765 0.10 % _______________________ (1) CO discount notes' weighted-average rate represents a yield to maturity excluding concession fees.

Affordable Housing Program

Affordable Housing Program	9 Months Ended
Affordable Housing Program	Sep. 30, 2021
Affordable Housing Program (AHP) [Abstract]
Affordable Housing Program [Text Block]	Affordable Housing Program Table 9.1 - AHP Liability (dollars in thousands) For the Nine Months Ended September 30, 2021 For the Year Ended December 31, 2020 Balance at beginning of year $ 78,640 $ 86,131 AHP expense for the period 4,852 13,386 AHP voluntary contribution 6,023 1,614 AHP direct grant disbursements (14,690) (21,374) AHP subsidy for AHP advance disbursements (5,512) (1,216) Return of previously disbursed grants and subsidies 3,135 99 Balance at end of period $ 72,448 $ 78,640

Capital

Capital	9 Months Ended
Capital	Sep. 30, 2021
Banking Regulation, Total Capital [Abstract]
Capital [Text Block]	Capital We are subject to capital requirements under our capital plan, the FHLBank Act, and FHFA regulations and guidance: 1. Risk-based capital. We are required to maintain at all times permanent capital, defined as Class B stock, including Class B stock classified as mandatorily redeemable capital stock, and retained earnings, in an amount at least equal to the sum of our credit-risk capital requirement, market-risk capital requirement, and operations-risk capital requirement, calculated in accordance with FHFA rules and regulations, referred to herein as the risk-based capital requirement. Only permanent capital satisfies the risk-based capital requirement. 2. Total regulatory capital. We are required to maintain at all times a total capital-to-assets ratio of at least four percent. Total regulatory capital is the sum of permanent capital, the amount paid-in for Class A stock, the amount of any general loss allowance if consistent with GAAP and not established for specific assets, and other amounts from sources determined by the FHFA as available to absorb losses. We have never issued Class A stock. 3. Leverage capital. We are required to maintain at all times a leverage capital-to-assets ratio of at least five percent. Leverage capital is calculated by multiplying permanent capital by 1.5 and adding to this product all other components of total capital. The FHFA has authority to require us to maintain a greater amount of permanent capital than is required as defined by the risk-based capital requirements. Table 10.1 - Regulatory Capital Requirements (dollars in thousands) Risk-Based Capital Requirements September 30, December 31, Permanent capital Class B capital stock $ 1,028,177 $ 1,267,172 Mandatorily redeemable capital stock 13,890 6,282 Retained earnings 1,527,929 1,498,642 Total permanent capital $ 2,569,996 $ 2,772,096 Risk-based capital requirement Credit-risk capital $ 85,086 $ 96,143 Market-risk capital 222,735 204,028 Operations-risk capital 92,346 90,052 Total risk-based capital requirement $ 400,167 $ 390,223 Permanent capital in excess of risk-based capital requirement $ 2,169,829 $ 2,381,873 September 30, 2021 December 31, 2020 Required Actual Required Actual Capital Ratio Risk-based capital $ 400,167 $ 2,569,996 $ 390,223 $ 2,772,096 Total regulatory capital 1,377,957 2,569,996 1,538,441 2,772,096 Total capital-to-asset ratio 4.0 % 7.5 % 4.0 % 7.2 % Leverage Ratio Leverage capital $ 1,722,446 $ 3,854,994 $ 1,923,052 $ 4,158,144 Leverage capital-to-assets ratio 5.0 % 11.2 % 5.0 % 10.8 % We are a cooperative whose members own most of our capital stock. Former members (including certain nonmembers that own our capital stock as a result of merger or acquisition, relocation, or involuntary termination of membership) own the remaining capital stock to support business transactions still carried on our statement of condition or, for a small amount of capital stock held by former members, until the five-year redemption period applicable to their membership stock is complete. Shares of capital stock cannot be purchased or sold except between us and our members at $100 per share par value. We have only issued Class B stock and each member is required to purchase Class B stock equal to the sum of 0.20 percent of certain member assets eligible to secure advances under the FHLBank Act, provided that this amount is neither less than $10 thousand nor more than $10 million (the membership stock investment requirement), and 3.00 percent for overnight advances, 4.00 percent for all other advances, 0.25 percent for outstanding letters of credit, and 4.50 percent of the unpaid principal balance of certain mortgages we purchased through the MPF program (collectively, the activity-based stock-investment requirement). The sum of the membership stock investment requirement and the activity-based stock investment requirement, rounded up to the nearest whole share, represents the total stock investment requirement. Restricted Retained Earnings. At September 30, 2021, our restricted retained earnings totaled $368.4 million and exceeded the contribution requirement of $319.8 million. Restricted retained earnings are not available to pay dividends.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	9 Months Ended
Accumulated Other Comprehensive Income (Loss)	Sep. 30, 2021
AOCI Attributable to Parent [Abstract]
Accumulated Other Comprehensive Income (Loss) [Text Block]	Accumulated Other Comprehensive Income (Loss) Table 11.1 - Accumulated Other Comprehensive Income (Loss) (dollars in thousands) Net Unrealized Gain (Loss) on Available-for-sale Securities Noncredit Portion of Other-than-temporary Impairment Losses on Held-to-maturity Securities Net Unrealized (Loss) Gain Relating to Hedging Activities Pension and Postretirement Benefits Total Balance, June 30, 2020 $ (44,000) $ (50,407) $ (27,956) $ (6,108) $ (128,471) Other comprehensive income (loss) before reclassifications: Adjustment for transfer of securities from held-to-maturity to available-for-sale 16,062 31,502 — — 47,564 Net unrealized gains 62,434 — 15 — 62,449 Noncredit losses included in basis of securities sold — 18,905 — — 18,905 Net actuarial loss — — — (382) (382) Reclassifications from other comprehensive income to net income Reclassification of realized net gains included in net income (26,210) — — — (26,210) Amortization - hedging activities (1) — — 1,788 — 1,788 Amortization - pension and postretirement benefits (2) — — — 290 290 Other comprehensive income (loss) 52,286 50,407 1,803 (92) 104,404 Balance, September 30, 2020 $ 8,286 $ — $ (26,153) $ (6,200) $ (24,067) Balance, June 30, 2021 $ 84,460 $ — $ (30,340) $ (6,475) $ 47,645 Other comprehensive income (loss) before reclassifications: Net unrealized (losses) gains (17,961) — 8,672 — (9,289) Net actuarial gain — — — 646 646 Reclassifications from other comprehensive income to net income Amortization - hedging activities (1) — — 1,453 — 1,453 Amortization - pension and postretirement benefits (2) — — — 149 149 Other comprehensive (loss) income (17,961) — 10,125 795 (7,041) Balance, September 30, 2021 $ 66,499 $ — $ (20,215) $ (5,680) $ 40,604 Net Unrealized Gain (Loss) on Available-for-sale Securities Noncredit Portion of Other-than-temporary Impairment Losses on Held-to-maturity Securities Net Unrealized (Loss) Gain Relating to Hedging Activities Pension and Postretirement Benefits Total Balance, December 31, 2019 $ (73,922) $ (76,036) $ (30,207) $ (6,807) $ (186,972) Other comprehensive income (loss) before reclassifications: Adjustment for transfer of securities from held-to-maturity to available-for-sale 16,062 31,502 — — 47,564 Net unrealized gains (losses) 92,356 — (1,264) — 91,092 Noncredit losses included in basis of securities sold — 39,144 — — 39,144 Accretion of noncredit loss — 5,390 — — 5,390 Net actuarial loss — — — (270) (270) Reclassifications from other comprehensive income to net income Reclassification of realized net gains included in net income (26,210) — — — (26,210) Amortization - hedging activities (1) — — 5,318 — 5,318 Amortization - pension and postretirement benefits (2) — — — 877 877 Other comprehensive income 82,208 76,036 4,054 607 162,905 Balance, September 30, 2020 $ 8,286 $ — $ (26,153) $ (6,200) $ (24,067) Balance, December 31, 2020 $ 48,568 $ — $ (24,365) $ (8,064) $ 16,139 Other comprehensive income (loss) before reclassifications: Net unrealized gains (losses) 17,931 — (366) — 17,565 Net actuarial gain — — — 1,938 1,938 Reclassifications from other comprehensive income to net income Amortization - hedging activities (1) — — 4,516 — 4,516 Amortization - pension and postretirement benefits (2) — — — 446 446 Other comprehensive income 17,931 — 4,150 2,384 24,465 Balance, September 30, 2021 $ 66,499 $ — $ (20,215) $ (5,680) $ 40,604 _______________________ (1) Recorded in CO bond interest expense. (2) Recorded in other expenses in the statement of operations.

Fair Values

Fair Values	9 Months Ended
Fair Values	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value [Text Block]	Fair Values A fair-value hierarchy is used to prioritize the inputs of valuation techniques used to measure fair value. A description of the application of the fair-value hierarchy, valuation techniques, and significant inputs is disclosed in Part II — Item 8 — Financial Statements and Supplementary Data — Note 19 — Fair Values in the 2020 Annual Report. There have been no material changes in the fair-value hierarchy classification of financial assets and liabilities, valuation techniques, or significant inputs during the three months ended September 30, 2021. Table 12.1 presents the carrying value, fair value, and fair-value hierarchy of our financial assets and liabilities at September 30, 2021, and December 31, 2020. We record trading securities, available-for-sale securities, derivative assets, derivative liabilities, and certain other assets at fair value on a recurring basis and certain mortgage loans, and certain other assets at fair value on a non-recurring basis. We record all other financial assets and liabilities at amortized cost. Refer to Table 12.2 for further details about the financial assets and liabilities held at fair value on either a recurring or non-recurring basis. Table 12.1 - Fair Value Summary (dollars in thousands) September 30, 2021 Carrying Value Total Fair Value Level 1 Level 2 Level 3 Netting Adjustments and Cash Collateral (2) Financial instruments Assets: Cash and due from banks $ 205,284 $ 205,284 $ 205,284 $ — $ — $ — Interest-bearing deposits 149 149 149 — — — Securities purchased under agreements to resell 500,000 500,000 — 500,000 — — Federal funds sold 1,848,000 1,848,000 — 1,848,000 — — Trading securities (1) 1,759,851 1,759,851 — 1,759,851 — — Available-for-sale securities (1) 12,132,257 12,132,257 — 12,058,415 73,842 — Held-to-maturity securities 164,167 167,598 — 167,598 — — Advances 14,056,991 14,223,804 — 14,223,804 — — Mortgage loans, net 3,283,925 3,424,954 — 3,392,839 32,115 — Accrued interest receivable 74,470 74,470 — 74,470 — — Derivative assets (1) 356,261 356,261 — 9,761 — 346,500 Other assets (1) 39,728 39,728 16,616 23,112 — — Liabilities: Deposits (970,732) (970,731) — (970,731) — — COs: Bonds (25,097,469) (25,466,219) — (25,466,219) — — Discount notes (5,554,103) (5,554,255) — (5,554,255) — — Mandatorily redeemable capital stock (13,890) (13,890) (13,890) — — — Accrued interest payable (59,159) (59,159) — (59,159) — — Derivative liabilities (1) (21,401) (21,401) — (114,867) — 93,466 Other: Commitments to extend credit for advances — (6,407) — (6,407) — — Standby letters of credit (972) (972) — (972) — — December 31, 2020 Carrying Value Total Fair Value Level 1 Level 2 Level 3 Netting Adjustments and Cash Collateral (2) Financial instruments Assets: Cash and due from banks $ 2,050,028 $ 2,050,028 $ 2,050,028 $ — $ — $ — Interest-bearing deposits 299,149 299,149 299,149 — — — Securities purchased under agreements to resell 750,000 749,995 — 749,995 — — Federal funds sold 2,260,000 2,259,988 — 2,259,988 — — Trading securities (1) 3,605,079 3,605,079 — 3,605,079 — — Available-for-sale securities (1) 6,220,148 6,220,148 — 6,097,599 122,549 — Held-to-maturity securities 207,162 211,837 — 211,837 — — Advances 18,817,002 19,119,220 — 19,119,220 — — Mortgage loans, net 3,930,252 4,136,004 — 4,086,757 49,247 — Accrued interest receivable 87,582 87,582 — 87,582 — — Derivative assets (1) 161,238 161,238 — 10,182 — 151,056 Other assets (1) 34,360 34,360 14,296 20,064 — — Liabilities: Deposits (1,088,987) (1,088,981) — (1,088,981) — — COs: Bonds (21,471,590) (22,062,476) — (22,062,476) — — Discount notes (12,878,310) (12,878,918) — (12,878,918) — — Mandatorily redeemable capital stock (6,282) (6,282) (6,282) — — — Accrued interest payable (61,918) (61,918) — (61,918) — — Derivative liabilities (1) (24,062) (24,062) — (88,770) — 64,708 Other: Commitments to extend credit for advances — (5,306) — (5,306) — — Standby letters of credit (1,303) (1,303) — (1,303) — — _______________________ (1) Carried at fair value and measured on a recurring basis. (2) These amounts represent the effect of master-netting agreements intended to allow us to settle positive and negative positions and also cash collateral and related accrued interest held or placed with the same clearing member and/or counterparty. Fair Value Measured on a Recurring and Nonrecurring Basis. Table 12.2 - Fair Value of Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis (dollars in thousands) September 30, 2021 Level 1 Level 2 Level 3 Netting Adjustments and Cash Collateral (1) Total Assets: Carried at fair value on a recurring basis Trading securities: Corporate bonds $ — $ 1,524 $ — $ — $ 1,524 U.S. Treasury obligations — 1,756,149 — — 1,756,149 U.S. government-guaranteed – single-family MBS — 2,133 — — 2,133 GSE – single-family MBS — 45 — — 45 Total trading securities — 1,759,851 — — 1,759,851 Available-for-sale securities: HFA securities — — 73,842 — 73,842 Supranational institutions — 411,601 — — 411,601 U.S. Treasury obligations — 4,387,672 — — 4,387,672 U.S. government-owned corporations — 304,506 — — 304,506 GSE — 126,308 — — 126,308 U.S. government guaranteed – single-family MBS — 23,025 — — 23,025 U.S. government guaranteed – multifamily MBS — 453,891 — — 453,891 GSE – single-family MBS — 1,223,504 — — 1,223,504 GSE – multifamily MBS — 5,127,908 — — 5,127,908 Total available-for-sale securities — 12,058,415 73,842 — 12,132,257 Derivative assets: Interest-rate-exchange agreements — 9,418 — 346,500 355,918 CO bond firm commitments — 296 — — 296 Mortgage delivery commitments — 47 — — 47 Total derivative assets — 9,761 — 346,500 356,261 Other assets 16,616 23,112 — — 39,728 Total assets carried at fair value on a recurring basis $ 16,616 $ 13,851,139 $ 73,842 $ 346,500 $ 14,288,097 Carried at fair value on a nonrecurring basis (2) Mortgage loans held for portfolio $ — $ — $ 3,736 $ — $ 3,736 REO — — 59 — 59 Total assets carried at fair value on a nonrecurring basis $ — $ — $ 3,795 $ — $ 3,795 Liabilities: Carried at fair value on a recurring basis Derivative liabilities Interest-rate-exchange agreements $ — $ (114,851) $ — $ 93,466 $ (21,385) Mortgage delivery commitments — (16) — — (16) Total liabilities carried at fair value on a recurring basis $ — $ (114,867) $ — $ 93,466 $ (21,401) December 31, 2020 Level 1 Level 2 Level 3 Netting Adjustments and Cash Collateral (1) Total Assets: Carried at fair value on a recurring basis Trading securities: Corporate bonds $ — $ 5,422 $ — $ — $ 5,422 U.S. Treasury obligations — 3,596,718 — — 3,596,718 U.S. government-guaranteed – single-family MBS — 2,884 — — 2,884 GSE – single-family MBS — 55 — — 55 Total trading securities — 3,605,079 — — 3,605,079 Available-for-sale securities: HFA securities — — 122,549 — 122,549 Supranational institutions — 430,069 — — 430,069 U.S. government-owned corporations — 322,061 — — 322,061 GSE — 134,992 — — 134,992 U.S. government guaranteed – single-family MBS — 29,408 — — 29,408 U.S. government guaranteed – multifamily MBS — 47,180 — — 47,180 GSE – single-family MBS — 1,469,048 — — 1,469,048 GSE – multifamily MBS — 3,664,841 — — 3,664,841 Total available-for-sale securities — 6,097,599 122,549 — 6,220,148 Derivative assets: Interest-rate-exchange agreements — 9,962 — 151,056 161,018 Mortgage delivery commitments — 220 — — 220 Total derivative assets — 10,182 — 151,056 161,238 Other assets 14,296 20,064 — — 34,360 Total assets carried at fair value on a recurring basis $ 14,296 $ 9,732,924 $ 122,549 $ 151,056 $ 10,020,825 Carried at fair value on a nonrecurring basis (2) Mortgage loans held for portfolio $ — $ — $ 10,782 $ — $ 10,782 REO — — 245 — 245 Total assets carried at fair value on a nonrecurring basis $ — $ — $ 11,027 $ — $ 11,027 Liabilities: Carried at fair value on a recurring basis Derivative liabilities Interest-rate-exchange agreements $ — $ (88,770) $ — $ 64,708 $ (24,062) Total liabilities carried at fair value on a recurring basis $ — $ (88,770) $ — $ 64,708 $ (24,062) _______________________ (1) These amounts represent the effect of master-netting agreements intended to allow us to settle positive and negative positions and also cash collateral and related accrued interest held or placed with the same clearing member and/or counterparty. (2) We measure certain held-to-maturity investment securities, mortgage loans held for portfolio, and REO at fair value on a nonrecurring basis, that is, they are not measured at fair value on an ongoing basis but are subject to fair-value adjustments only in certain circumstances. The fair values presented are as of the date the fair value adjustment was recorded. Table 12.3 presents a reconciliation of available-for-sale HFA securities that are measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the three and nine months ended September 30, 2021 and 2020. Table 12.3 - Roll Forward of Level 3 Available-for-Sale Securities (dollars in thousands) HFA Securities For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 Balance at beginning of period $ 86,077 $ 59,463 $ 122,549 $ 64,652 Transfer of securities from held-to-maturity to available-for-sale — 71,240 — 71,240 Total net unrealized gains included in other comprehensive income 125 3,040 3,458 5,451 Maturities and settlements Maturities (12,360) (7,995) (50,720) (15,595) Settlements — — (1,445) — Balance at end of period $ 73,842 $ 125,748 $ 73,842 $ 125,748 Total amount of unrealized gains for the period included in other comprehensive income relating to securities held at period end $ 125 $ 2,384 $ 342 $ 4,758 Private-label MBS For the Three Months Ended September 30, 2020 For the Nine Months Ended September 30, 2020 Balance at beginning of period $ — $ — Transfer of securities from held-to-maturity to available-for-sale 180,514 180,514 Total gains included in earnings Net gains on sale 26,210 26,210 Reduction of provision for credit losses 211 211 Accretion 272 272 Total gains included in other comprehensive income Total net unrealized gains included in other comprehensive income (17,098) (17,098) Maturities and settlements Sales (165,439) (165,439) Maturities — — Settlements (1,892) (1,892) Balance at end of period $ 22,778 $ 22,778 Total amount of unrealized gains for the period included in other comprehensive income relating to securities held at period end $ 617 $ 617 Total amount of gains for the period included in earnings attributable to the provision for credit losses and accretion of discounts relating to securities held at period end $ 415 $ 415

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies [Text Block]	Commitments and Contingencies Joint and Several Liability. COs are backed by the financial resources of the FHLBanks. The FHFA has authority to require any FHLBank to repay all or a portion of the principal and interest on COs for which another FHLBank is the primary obligor. No FHLBank has ever been asked or required to repay the principal or interest on any CO on behalf of another FHLBank. We evaluate the financial condition of the other FHLBanks primarily based on known regulatory actions, publicly available financial information, and individual long-term credit-rating action as of each period-end presented. Based on this evaluation, as of September 30, 2021, and through the filing of this report, we do not believe it is likely that we will be required to repay the principal or interest on any CO on behalf of another FHLBank. We have considered applicable FASB guidance and determined it is not necessary to recognize a liability for the fair value of our joint and several liability for all of the COs. The joint and several obligation is mandated by the FHLBank Act, as implemented by FHFA regulations, and is not the result of an arms-length transaction among the FHLBanks. The FHLBanks have no control over the amount of the guaranty or the determination of how each FHLBank would perform under the joint and several obligation. Because the FHLBanks are subject to the authority of the FHFA as it relates to decisions involving the allocation of the joint and several liability for the FHLBanks' COs, the FHLBanks' joint and several obligation is excluded from the initial recognition and measurement provisions. Accordingly, we have not recognized a liability for our joint and several obligation related to other FHLBanks' COs at September 30, 2021, and December 31, 2020. The par amounts of other FHLBanks' outstanding COs for which we are jointly and severally liable totaled $610.8 billion and $712.5 billion at September 30, 2021, and December 31, 2020, respectively. See Note 8 — Consolidated Obligations for additional information. Off-Balance-Sheet Commitments Table 13.1 - Off-Balance Sheet Commitments (1) (dollars in thousands) September 30, 2021 December 31, 2020 Expire within one year Expire after one year Total Expire within one year Expire after one year Total Standby letters of credit outstanding (2) $ 5,112,384 $ 200,788 $ 5,313,172 $ 6,190,479 $ 233,771 $ 6,424,250 Commitments for unused lines of credit - advances (3) 1,120,311 — 1,120,311 1,127,432 — 1,127,432 Commitments to make additional advances 50,940 72,646 123,586 69,684 93,465 163,149 Commitments to invest in mortgage loans 8,019 — 8,019 28,386 — 28,386 Unsettled CO bonds, at par 597,000 — 597,000 — — — Unsettled CO discount notes, at par — — — 250,000 — 250,000 __________________________ (1) We have determined that it is unnecessary to record any liability for credit losses on these agreements. (2) The amount of standby letters of credit outstanding excludes commitments to issue standby letters of credit that expire within one year. At September 30, 2021, and December 31, 2020, these amounts totaled $81.5 million and $37.1 million, respectively. Also excluded are commitments to issue standby letters of credit that expire after one year totaling $25 thousand at December 31, 2020. (3) Commitments for unused line-of-credit advances are generally for periods of up to 12 months. Since many of these commitments are not expected to be drawn upon, the total commitment amount does not necessarily indicate future liquidity requirements. Standby Letters of Credit. We issue standby letters of credit on behalf of our members to support certain obligations of the members to third-party beneficiaries. These standby letters of credit are subject to the same collateralization and borrowing limits that are applicable to advances. Standby letters of credit may be offered to assist members in facilitating residential housing finance, community lending, and asset-liability management, and to provide liquidity. In particular, members often use standby letters of credit as collateral for deposits from state and local government agencies. Standby letters of credit are executed for members for a fee. If we are required to make payment for a beneficiary's draw, our strategy is to take prompt action to recover the funds paid to the third-party beneficiary, including converting the payment amount into a collateralized advance to the primary obligor, withdrawing the payment amount from the primary obligor's demand deposit account with us, or selling collateral pledged by the primary obligor in a commercially reasonable manner to offset the payment amount. Historically, standby letters of credit usually expire without being drawn upon. At September 30, 2021, the terms of these standby letters of credit have original expiration periods of up to 20 years, expiring no later than 2031. Currently, we offer new standby letters of credit with terms typically up to 10 years, while terms greater than 10 years may be available on an exception basis. Unearned fees for the value of the guarantees related to standby letters of credit are recorded in other liabilities and totaled $972 thousand and $1.3 million at September 30, 2021, and December 31, 2020, respectively. Commitments to Invest in Mortgage Loans. Commitments to invest in mortgage loans are generally for periods not to exceed 60 business days. Such commitments are recorded as derivatives at their fair values on the statement of condition. Pledged Collateral. We have pledged securities as collateral related to derivatives. See Note 6 — Derivatives and Hedging Activities for additional information about our pledged collateral and other credit-risk-related contingent features. Legal Proceedings . We are subject to various legal proceedings arising in the normal course of business from time to time. We would record an accrual for a loss contingency when it is probable that a loss has been incurred and the amount can be reasonably estimated. Management does not anticipate that the ultimate liability, if any, arising out of these matters will have a material effect on our financial condition, results of operations, or cash flows.

Transactions with Shareholders

Transactions with Shareholders	9 Months Ended
Transactions with Shareholders	Sep. 30, 2021
Transactions with Shareholders [Abstract]
Transactions with Shareholders [Text Block]	Transactions with Shareholders Shareholder Concentrations. We consider shareholder concentrations as members or nonmembers whose capital stock holdings (including mandatorily redeemable capital stock) are in excess of 10 percent of total capital stock outstanding at September 30, 2021, and December 31, 2020. At both September 30, 2021, and December 31, 2020, no shareholder had more than 10 percent of total capital stock outstanding. Transactions with Directors' Institutions. We provide, in the ordinary course of business, products and services to members whose officers or directors serve on our board of directors. In accordance with FHFA regulations, transactions with directors' institutions are conducted on the same terms as those with any other member. Table 14.1 - Transactions with Directors' Institutions (dollars in thousands) Capital Stock Outstanding Percent of Total Capital Stock Par Value of Advances Percent of Total Par Value of Advances Total Accrued Interest Receivable Percent of Total September 30, 2021 $ 50,334 4.8 % $ 480,328 3.4 % $ 493 2.3 % December 31, 2020 60,624 4.8 582,765 3.1 651 2.5

Subsequent Events

Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2021
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Subsequent EventsOn October 22, 2021, the board of directors declared a cash dividend at an annualized rate of 2.05 percent based on daily average capital stock balances outstanding during the third quarter of 2021. The dividend, including dividends classified as interest on mandatorily redeemable capital stock, amounted to $5.5 million and was paid on November 2, 2021.

Basis of Presentation - Summary

Basis of Presentation - Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2021
Accounting Policies [Abstract]
Investment, Policy	Gains and Losses on Sales. We compute gains and losses on sales of investment securities using the specific identification method and include these gains and losses in other income (loss).We evaluate our individual available-for-sale securities for impairment by comparing the security’s fair value to its amortized costWe evaluate our held-to-maturity securities for impairment on a collective or pooled basis unless an individual assessment is deemed necessary because the securities do not possess similar risk characteristics.
Credit Loss, Financial Instrument, Policy	Allowance for Credit Losses on Available-for-Sale Securities and Held-to-Maturity SecuritiesWe evaluate available-for-sale and held-to-maturity investment securities for credit losses on a quarterly basis.
Loans and Leases Receivable, Troubled Debt Restructuring, Policy	Relief to Borrowers During the COVID-19 Pandemic. We have elected to apply Section 4013 of the Coronavirus Aid, Relief, and Economic Security Act (CARES Act) to our loan modifications that qualify under the CARES Act.
Derivatives, Policy	Changes in fair value of the derivative hedging instrument and the hedged item attributable to the hedged risk for designated fair-value hedges are recorded in net interest income in the same line as the earnings effect of the hedged item. For designated cash-flow hedges, the entire change in the fair value of the hedging instrument (assuming it is included in the assessment of hedge effectiveness) is reported in other comprehensive income until the hedged transaction affects earnings. At that time, this amount is reclassified from other comprehensive income and recorded in net interest income in the same line as the earnings effect of the hedged item.We enter into derivatives that we clear (cleared derivatives) with a derivatives clearing organization (DCO), our counterparty for such derivatives. We also enter into derivatives that are not cleared (uncleared derivatives) under master-netting agreements.We utilize one of two DCOs for each cleared derivative transaction, Chicago Mercantile Exchange Inc. (CME Inc.) or LCH Limited (LCH Ltd.). Based upon their rulebooks, we characterize variation margin payments as daily settlement payments, rather than as collateral. At both DCOs, posted initial margin is considered collateral.
Fair Value of Financial Instruments, Policy [Policy Text Block]	We record trading securities, available-for-sale securities, derivative assets, derivative liabilities, and certain other assets at fair value on a recurring basis and certain mortgage loans, and certain other assets at fair value on a non-recurring basis. We record all other financial assets and liabilities at amortized cost.
Joint and Several Liability Policy [Policy Text Block]	We evaluate the financial condition of the other FHLBanks primarily based on known regulatory actions, publicly available financial information, and individual long-term credit-rating action as of each period-end presented.

Investments (Tables)

Investments (Tables)	9 Months Ended
Investments (Tables)	Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block]	Table 3.1 - Trading Securities by Major Security Type (dollars in thousands) September 30, 2021 December 31, 2020 Corporate bonds $ 1,524 $ 5,422 U.S. Treasury obligations 1,756,149 3,596,718 1,757,673 3,602,140 Mortgage-backed securities (MBS) U.S. government-guaranteed – single-family 2,133 2,884 Government-sponsored enterprises (GSE) – single-family 45 55 2,178 2,939 Total $ 1,759,851 $ 3,605,079
Gain (Loss) on Securities [Table Text Block]	Table 3.2 - Unrealized and Realized Gains (Losses) on Trading Securities (dollars in thousands) For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 Net unrealized (losses) gains on trading securities held at period end $ (9,841) $ (18,318) $ (25,811) $ 9,385 Net unrealized and realized losses on trading securities sold or matured during the period (1,253) (1,285) (14,725) (1,618) Net unrealized (losses) gains on trading securities $ (11,094) $ (19,603) $ (40,536) $ 7,767
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]	Table 3.3 - Available-for-Sale Securities by Major Security Type (dollars in thousands) September 30, 2021 Amounts Recorded in Accumulated Other Comprehensive Income Amortized Cost (1) Unrealized Unrealized Fair U.S. Treasury obligations $ 4,386,399 $ 2,017 $ (744) $ 4,387,672 State housing-finance-agency obligations (HFA securities) 74,765 2 (925) 73,842 Supranational institutions 417,730 87 (6,216) 411,601 U.S. government-owned corporations 325,580 — (21,074) 304,506 GSE 130,836 — (4,528) 126,308 5,335,310 2,106 (33,487) 5,303,929 MBS U.S. government guaranteed – single-family 22,678 347 — 23,025 U.S. government guaranteed – multifamily 453,661 230 — 453,891 GSE – single-family 1,205,083 18,486 (65) 1,223,504 GSE – multifamily 5,049,026 101,326 (22,444) 5,127,908 6,730,448 120,389 (22,509) 6,828,328 Total $ 12,065,758 $ 122,495 $ (55,996) $ 12,132,257 December 31, 2020 Amounts Recorded in Accumulated Other Comprehensive Income Amortized Cost (1) Unrealized Unrealized Fair HFA securities $ 126,930 $ — $ (4,381) $ 122,549 Supranational institutions 442,225 — (12,156) 430,069 U.S. government-owned corporations 350,052 — (27,991) 322,061 GSE 140,136 — (5,144) 134,992 1,059,343 — (49,672) 1,009,671 MBS U.S. government guaranteed – single-family 29,148 260 — 29,408 U.S. government guaranteed – multifamily 46,829 351 — 47,180 GSE – single-family 1,442,282 26,790 (24) 1,469,048 GSE – multifamily 3,593,978 70,863 — 3,664,841 5,112,237 98,264 (24) 5,210,477 Total $ 6,171,580 $ 98,264 $ (49,696) $ 6,220,148 _______________________ (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. Amortized cost excludes accrued interest receivable of $24.2 million and $24.0 million at September 30, 2021, and December 31, 2020, respectively.
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table Text Block]	Table 3.4 - Available-for-Sale Securities in a Continuous Unrealized Loss Position (dollars in thousands) September 30, 2021 Continuous Unrealized Loss Less than 12 Months Continuous Unrealized Loss 12 Months or More Total Fair Unrealized Fair Unrealized Fair Unrealized U.S. Treasury obligations $ 1,959,169 $ (744) $ — $ — $ 1,959,169 $ (744) HFA securities — — 60,795 (925) 60,795 (925) Supranational institutions — — 396,677 (6,216) 396,677 (6,216) U.S. government-owned corporations — — 304,506 (21,074) 304,506 (21,074) GSE — — 126,308 (4,528) 126,308 (4,528) 1,959,169 (744) 888,286 (32,743) 2,847,455 (33,487) MBS GSE – single-family 87,064 (65) — — 87,064 (65) GSE – multifamily 982,060 (22,444) — — 982,060 (22,444) 1,069,124 (22,509) — — 1,069,124 (22,509) Total $ 3,028,293 $ (23,253) $ 888,286 $ (32,743) $ 3,916,579 $ (55,996) December 31, 2020 Continuous Unrealized Loss Less than 12 Months Continuous Unrealized Loss 12 Months or More Total Fair Unrealized Fair Unrealized Fair Unrealized HFA securities $ — $ — $ 109,780 $ (4,381) $ 109,780 $ (4,381) Supranational institutions — — 430,069 (12,156) 430,069 (12,156) U.S. government-owned corporations — — 322,061 (27,991) 322,061 (27,991) GSE — — 134,992 (5,144) 134,992 (5,144) — — 996,902 (49,672) 996,902 (49,672) MBS GSE – single-family — — 10,271 (24) 10,271 (24) Total $ — $ — $ 1,007,173 $ (49,696) $ 1,007,173 $ (49,696)
Investments Classified by Contractual Maturity Date [Table Text Block]	Table 3.5 - Available-for-Sale Securities by Contractual Maturity (dollars in thousands) September 30, 2021 December 31, 2020 Year of Maturity Amortized Fair Amortized Fair Due in one year or less $ 10,600 $ 10,591 $ 10,600 $ 10,524 Due after one year through five years 1,201,851 1,199,354 169,570 166,813 Due after five years through 10 years 3,713,611 3,710,246 400,477 389,753 Due after 10 years 409,248 383,738 478,696 442,581 5,335,310 5,303,929 1,059,343 1,009,671 MBS (1) 6,730,448 6,828,328 5,112,237 5,210,477 Total $ 12,065,758 $ 12,132,257 $ 6,171,580 $ 6,220,148 _______________________ (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.
Debt Securities, Held-to-maturity [Table Text Block]	Table 3.6 - Held-to-Maturity Securities by Major Security Type (dollars in thousands) September 30, 2021 Amortized Cost (1) Gross Unrecognized Holding Gains Gross Unrecognized Holding Losses Fair Value MBS U.S. government guaranteed – single-family $ 4,567 $ 87 $ — $ 4,654 GSE – single-family 159,600 3,440 (96) 162,944 Total $ 164,167 $ 3,527 $ (96) $ 167,598 December 31, 2020 Amortized Cost (1) Gross Unrecognized Holding Gains Gross Unrecognized Holding Losses Fair Value MBS U.S. government guaranteed – single-family $ 5,388 $ 103 $ — $ 5,491 GSE – single-family 201,774 4,681 (109) 206,346 Total $ 207,162 $ 4,784 $ (109) $ 211,837 _______________________ (1) Amortized cost of held-to-maturity securities includes adjustments made to the cost basis of an investment for accretion, amortization, and collection of cash. Amortized cost excludes accrued interest receivable of $233 thousand and $368 thousand at September 30, 2021, and December 31, 2020, respectively.
Schedule of Transfers of Securities, Held-to-maturity to Available-for-sale	Table 3.7 - Transfer of Held-to-Maturity Securities to Available-for-Sale Securities in Third Quarter 2020 (dollars in thousands) Amortized Cost Allowance for Credit Losses Other-Than-Temporary Impairment Recognized in Accumulated Other Comprehensive Loss Carrying Value Gross Unrecognized Holding Gains Gross Unrecognized Holding Losses Fair Value HFA securities $ 77,470 $ — $ — $ 77,470 $ — $ (6,230) $ 71,240 MBS GSE – single-family 17,802 — — 17,802 89 — 17,891 MBS - Private-label 158,945 (634) (31,502) 126,809 53,953 (248) 180,514 Total $ 254,217 $ (634) $ (31,502) $ 222,081 $ 54,042 $ (6,478) $ 269,645
Realized Gain (Loss) on Investments [Table Text Block]	Table 3.8 - Proceeds and Gains (Losses) from Sales of Investment Securities (dollars in thousands) For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 Available-for-Sale Securities Proceeds from sale $ — $ 165,439 $ — $ 165,439 Amortized cost, net of allowance for credit losses — 139,229 — 139,229 Gross realized gains from sale $ — $ 26,438 $ — $ 26,438 Gross realized losses from sale — (228) — (228) Realized net gain from sale $ — $ 26,210 $ — $ 26,210 Held-to-Maturity Securities Proceeds from sale $ — $ 101,107 $ — $ 262,850 Less: Carrying value — 75,522 — 176,293 Less: Noncredit losses recorded in accumulated other comprehensive income — 18,905 — 39,144 Realized net gain from sale $ — $ 6,680 $ — $ 47,413
Debt Securities, Held-to-maturity, Allowance for Credit Loss	Table 3.9 - Allowance for Credit Losses on Debt Securities (dollars in thousands) For the Three Months Ended September 30, 2020 For the Nine Months Ended September 30, 2020 Available-for-Sale Held-to-Maturity Available-for-Sale Held-to-Maturity Balance at beginning of period $ — $ 5,566 $ — $ — Adjustments for cumulative effect of change in accounting principle (1) — — — 5,308 Transfers 634 (634) 634 (634) Reduction of provision for credit losses due to sales of securities (68) (2,423) (68) (3,205) Reduction of provision for credit losses (143) (2,509) (143) (1,469) Charge-offs (299) — (299) — Balance at end of period $ 124 $ — $ 124 $ — _________________________ (1) We adopted new accounting guidance for the measurement of credit losses on financial instruments on January 1, 2020. See Item 8 — Financial Statements and Supplementary Data — Notes to Financial Statements — Note 3 — Recently Issued and Adopted Accounting Guidance in the 2020 Annual Report for information on the adoption of Financial Instruments - Credit Losses. Upon adoption of this new accounting guidance, we recorded through a cumulative effect adjustment to retained earnings an increase in the allowance for credit losses associated with held-to-maturity private-label MBS totaling $5.3 million.
Debt Securities, Available-for-sale, Allowance for Credit Loss	Table 3.9 - Allowance for Credit Losses on Debt Securities (dollars in thousands) For the Three Months Ended September 30, 2020 For the Nine Months Ended September 30, 2020 Available-for-Sale Held-to-Maturity Available-for-Sale Held-to-Maturity Balance at beginning of period $ — $ 5,566 $ — $ — Adjustments for cumulative effect of change in accounting principle (1) — — — 5,308 Transfers 634 (634) 634 (634) Reduction of provision for credit losses due to sales of securities (68) (2,423) (68) (3,205) Reduction of provision for credit losses (143) (2,509) (143) (1,469) Charge-offs (299) — (299) — Balance at end of period $ 124 $ — $ 124 $ — _________________________ (1) We adopted new accounting guidance for the measurement of credit losses on financial instruments on January 1, 2020. See Item 8 — Financial Statements and Supplementary Data — Notes to Financial Statements — Note 3 — Recently Issued and Adopted Accounting Guidance in the 2020 Annual Report for information on the adoption of Financial Instruments - Credit Losses. Upon adoption of this new accounting guidance, we recorded through a cumulative effect adjustment to retained earnings an increase in the allowance for credit losses associated with held-to-maturity private-label MBS totaling $5.3 million.

Advances (Tables)

Advances (Tables)	9 Months Ended
Advances (Tables)	Sep. 30, 2021
Advances [Abstract]
Advances [Table Text Block]	Table 4.1 - Advances Outstanding by Year of Contractual Maturity (dollars in thousands) September 30, 2021 December 31, 2020 Amount Weighted Amount Weighted Overdrawn demand-deposit accounts $ 97 0.59 % $ 135 0.62 % Due in one year or less 5,443,617 1.02 9,090,900 1.00 Due after one year through two years 2,106,482 2.17 2,281,047 1.78 Due after two years through three years 1,630,633 1.85 2,014,880 2.37 Due after three years through four years 2,372,177 1.29 1,685,056 1.79 Due after four years through five years 1,262,211 1.42 2,687,456 1.34 Thereafter 1,200,358 2.08 945,038 2.38 Total par value 14,015,575 1.46 % 18,704,512 1.43 % Premiums 888 2,248 Discounts (36,332) (37,592) Fair value of bifurcated derivatives (1) 29,155 44,534 Hedging adjustments 47,705 103,300 Total (2) $ 14,056,991 $ 18,817,002 _________________________ (1) At September 30, 2021, and December 31, 2020, we had certain advances with embedded features that met the requirements to be separated from the host contract and designated as stand-alone derivatives. (2) Excludes accrued interest receivable of $21.5 million and $25.8 million at September 30, 2021, and December 31, 2020, respectively. Table 4.2 - Advances Outstanding by Year of Contractual Maturity or Next Call Date (dollars in thousands) September 30, 2021 December 31, 2020 Overdrawn demand-deposit accounts $ 97 $ 135 Due in one year or less 6,505,792 10,149,975 Due after one year through two years 1,920,782 2,095,247 Due after two years through three years 1,388,558 1,809,880 Due after three years through four years 2,255,177 1,392,981 Due after four years through five years 758,511 2,335,956 Thereafter 1,186,658 920,338 Total par value $ 14,015,575 $ 18,704,512 Table 4.3 - Advances Outstanding by Year of Contractual Maturity or Next Put Date (dollars in thousands) September 30, 2021 December 31, 2020 Overdrawn demand-deposit accounts $ 97 $ 135 Due in one year or less 7,036,042 10,755,575 Due after one year through two years 1,320,482 2,201,797 Due after two years through three years 1,524,633 1,224,380 Due after three years through four years 1,785,252 1,593,056 Due after four years through five years 1,195,211 2,059,531 Thereafter 1,153,858 870,038 Total par value $ 14,015,575 $ 18,704,512 Table 4.4 - Advances by Current Interest Rate Terms (dollars in thousands) September 30, 2021 December 31, 2020 Fixed-rate $ 11,977,103 $ 16,742,602 Variable-rate 2,038,472 1,961,910 Total par value $ 14,015,575 $ 18,704,512 Table 4.5 - Advances Prepayment Fees (dollars in thousands) For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 Prepayment fees received from borrowers $ 6,370 $ 5,834 $ 20,515 $ 13,737 Hedging fair-value adjustments on prepaid advances (1,172) (64) (2,108) (2,961) Net discount (premiums) associated with prepaid advances 112 (124) (1,132) (128) Advance prepayment fees recognized in income, net $ 5,310 $ 5,646 $ 17,275 $ 10,648

Mortgage Loans Held for Portf_2

Mortgage Loans Held for Portfolio (Tables)	9 Months Ended
Mortgage Loans Held for Portfolio (Tables)	Sep. 30, 2021
Receivables [Abstract]
Mortgage Loans Held for Portfolio [Table Text Block]	Table 5.1 - Mortgage Loans Held for Portfolio (dollars in thousands) September 30, 2021 December 31, 2020 Real estate Fixed-rate 15-year single-family mortgages $ 297,104 $ 322,713 Fixed-rate 20- and 30-year single-family mortgages 2,936,183 3,547,994 Premiums 50,990 60,050 Discounts (761) (1,094) Deferred derivative gains, net 2,464 3,689 Total mortgage loans held for portfolio (1) 3,285,980 3,933,352 Less: allowance for credit losses (2,055) (3,100) Total mortgage loans, net of allowance for credit losses $ 3,283,925 $ 3,930,252 ________________________ (1) Excludes accrued interest receivable of $16.0 million and $19.3 million at September 30, 2021, and December 31, 2020, respectively. Table 5.2 - Mortgage Loans Held for Portfolio by Collateral/Guarantee Type (dollars in thousands) September 30, 2021 December 31, 2020 Conventional mortgage loans $ 3,030,709 $ 3,624,557 Government mortgage loans 202,578 246,150 Total par value $ 3,233,287 $ 3,870,707
Financing Receivable Credit Quality Indicators [Table Text Block]	Table 5.3 - Credit Quality Indicator for Conventional Mortgage Loans (dollars in thousands) September 30, 2021 Year of Origination Payment Status at Amortized Cost Prior to 2017 2017 to 2021 Total Past due 30-59 days delinquent $ 8,528 $ 10,052 $ 18,580 Past due 60-89 days delinquent 3,109 947 4,056 Past due 90 days or more delinquent 12,284 11,802 24,086 Total past due 23,921 22,801 46,722 Total current loans 1,246,591 1,786,178 3,032,769 Total mortgage loans $ 1,270,512 $ 1,808,979 $ 3,079,491 December 31, 2020 Year of Origination Payment Status at Amortized Cost Prior to 2016 2016 to 2020 Total Past due 30-59 days delinquent $ 11,743 $ 25,058 $ 36,801 Past due 60-89 days delinquent 5,263 11,178 16,441 Past due 90 days or more delinquent 20,894 43,529 64,423 Total past due 37,900 79,765 117,665 Total current loans 1,246,691 2,317,975 3,564,666 Total mortgage loans $ 1,284,591 $ 2,397,740 $ 3,682,331
Amortized Cost/Recorded Investment in Delinquent Mortgage Loans [Table Text Block]	Table 5.4 - Other Delinquency Statistics of Mortgage Loans (dollars in thousands) September 30, 2021 Amortized Cost in Conventional Mortgage Loans Amortized Cost in Government Mortgage Loans Total In process of foreclosure (1) $ 367 $ 1,008 $ 1,375 Serious delinquency rate (2) 0.80 % 3.11 % 0.94 % Past due 90 days or more still accruing interest $ — $ 5,410 $ 5,410 Loans on nonaccrual status (3) $ 24,540 $ 1,090 $ 25,630 December 31, 2020 Amortized Cost in Conventional Mortgage Loans Amortized Cost in Government Mortgage Loans Total In process of foreclosure (1) $ 1,762 $ 1,041 $ 2,803 Serious delinquency rate (2) 1.75 % 6.04 % 2.02 % Past due 90 days or more still accruing interest $ — $ 5,592 $ 5,592 Loans on nonaccrual status (4) $ 65,039 $ 10,101 $ 75,140 _______________________ (1) Includes loans where the decision of foreclosure or similar alternative such as pursuit of deed-in-lieu of foreclosure has been reported. (2) Loans that are 90 days or more past due or in the process of foreclosure expressed as a percentage of the recorded investment in the total loan portfolio class. (3) As of September 30, 2021, the conventional and government mortgage loans on nonaccrual status that did not have an associated allowance for credit losses amounted to $13.6 million and $1.1 million, respectively. (4) As of December 31, 2020, the conventional and government mortgage loans on nonaccrual status that did not have an associated allowance for credit losses amounted to $31.8 million and $10.1 million, respectively.
Rollforward of Allowance for Credit Losses on Mortgage Loans [Table Text Block]	Table 5.5 presents a roll forward of the allowance for credit losses on conventional mortgage loans for the three and nine months ended September 30, 2021 and 2020. Table 5.5 - Allowance for Credit Losses on Conventional Mortgage Loans (dollars in thousands) For the Three Months Ended September 30, For the Nine Months Ended September 30, Allowance for credit losses (1) 2021 2020 2021 2020 Balance, beginning of period $ 2,125 $ 4,602 $ 3,100 $ 500 Adjustment for cumulative effect of change in accounting principle — — — 2,221 Recoveries (charge-offs) 10 (3) 62 (83) (Reduction of) provision for credit losses (80) 1 (1,107) 1,962 Balance, end of period $ 2,055 $ 4,600 $ 2,055 $ 4,600 _________________________ (1) These amounts exclude government mortgage loans because we make no allowance for credit losses based on our investments in government mortgage loans, as discussed below under — Government Mortgage Loans Held for Portfolio.

Derivatives and Hedging Activ_2

Derivatives and Hedging Activities (Tables)	9 Months Ended
Derivatives and Hedging Activities (Tables)	Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Fair Value of Derivative Instruments [Table Text Block]	Table 6.1 - Fair Value of Derivative Instruments (dollars in thousands) September 30, 2021 December 31, 2020 Notional Derivative Derivative Notional Derivative Derivative Derivatives designated as hedging instruments Interest-rate swaps $ 25,284,371 $ 6,008 $ (82,585) $ 9,960,475 $ 6,044 $ (41,000) Forward-start interest-rate swaps 1,391,000 — (376) 17,000 — (14) Total derivatives designated as hedging instruments 26,675,371 6,008 (82,961) 9,977,475 6,044 (41,014) Derivatives not designated as hedging instruments Interest-rate swaps 2,394,800 3,410 (31,890) 5,536,822 3,918 (47,756) CO bond firm commitments 75,000 296 — — — — Mortgage-delivery commitments (1) 8,019 47 (16) 28,386 220 — Total derivatives not designated as hedging instruments 2,477,819 3,753 (31,906) 5,565,208 4,138 (47,756) Total notional amount of derivatives $ 29,153,190 $ 15,542,683 Total derivatives before netting and collateral adjustments 9,761 (114,867) 10,182 (88,770) Netting adjustments and cash collateral, including related accrued interest (2) 346,500 93,466 151,056 64,708 Derivative assets and derivative liabilities $ 356,261 $ (21,401) $ 161,238 $ (24,062) _______________________ (1) Mortgage-delivery commitments are classified as derivatives with changes in fair value recorded in other income. (2) Amounts represent the effect of master-netting agreements intended to allow us to settle positive and negative positions with the same counterparty. Cash collateral including accrued interest posted was $440.0 million and $215.8 million at September 30, 2021, and December 31, 2020, respectively. The change in cash collateral posted is included in the net change in interest-bearing deposits in the statement of cash flows. There was no cash collateral and related accrued interest received at September 30, 2021, and December 31, 2020.
Net Gains (Losses) on Derivatives and Hedging Activities [Table Text Block]	Table 6.2 presents the net gains (losses) on qualifying fair-value hedging relationships. Gains (losses) on derivatives include unrealized changes in fair value as well as net interest settlements. Table 6.2 - Net Gains (Losses) on Fair Value Hedging Relationships (dollars in thousands) For the Three Months Ended September 30, 2021 Advances Available-for-sale Securities CO Bonds Total interest income (expense) in the statements of operations $ 40,864 $ 18,901 $ (48,861) Gains (losses) on hedging relationships Changes in fair value: Derivatives $ 13,855 $ 68,669 $ (24,570) Hedged items (13,691) (65,848) 24,739 Net changes in fair value before price alignment interest 164 2,821 169 Price alignment interest (1) 3 11 (1) Net interest settlements on derivatives (2)(3) (15,531) (32,980) 20,442 Net (losses) gains on qualifying hedging relationships (15,364) (30,148) 20,610 Amortization/accretion of discontinued hedging relationships (363) — (847) Net (losses) gains on derivatives and hedging activities recorded in net interest income $ (15,727) $ (30,148) $ 19,763 For the Three Months Ended September 30, 2020 Advances Available-for-sale Securities CO Bonds Total interest income (expense) in the statements of operations $ 71,218 $ 17,495 $ (82,962) Gains (losses) on hedging relationships Changes in fair value: Derivatives $ 23,278 $ 46,086 $ (15,306) Hedged items (22,865) (44,264) 15,032 Net changes in fair value before price alignment interest 413 1,822 (274) Price alignment interest (1) 38 139 (11) Net interest settlements on derivatives (2)(3) (18,663) (20,361) 7,625 Net gains (losses) on qualifying hedging relationships (18,212) (18,400) 7,340 Amortization/accretion of discontinued hedging relationships (383) — (984) Net (losses) gains on derivatives and hedging activities recorded in net interest income $ (18,595) $ (18,400) $ 6,356 For the Nine Months Ended September 30, 2021 Advances Available-for-sale Securities CO Bonds Total interest income (expense) in the statements of operations $ 133,646 $ 52,737 $ (164,146) Gains (losses) on hedging relationships Changes in fair value: Derivatives $ 54,752 $ 196,187 $ (92,427) Hedged items (53,831) (189,916) 92,898 Net changes in fair value before price alignment interest 921 6,271 471 Price alignment interest (1) 19 76 (4) Net interest settlements on derivatives (2)(3) (47,398) (84,764) 43,912 Net (losses) gains on qualifying hedging relationships (46,458) (78,417) 44,379 Amortization/accretion of discontinued hedging relationships (1,767) — (2,249) Net (losses) gains on derivatives and hedging activities recorded in net interest income $ (48,225) $ (78,417) $ 42,130 For the Nine Months Ended September 30, 2020 Advances Available-for-sale Securities CO Bonds Total interest income (expense) in the statements of operations $ 340,695 $ 46,993 $ (300,765) Gains (losses) on hedging relationships Changes in fair value: Derivatives $ (106,522) $ (341,805) $ 42,327 Hedged items 105,204 333,919 (43,793) Net changes in fair value before price alignment interest (1,318) (7,886) (1,466) Price alignment interest (1) 452 1,259 (196) Net interest settlements on derivatives (2)(3) (35,971) (49,918) 17,621 Net (losses) gains on qualifying hedging relationships (36,837) (56,545) 15,959 Amortization/accretion of discontinued hedging relationships (1,213) — (2,819) Net (losses) gains on derivatives and hedging activities recorded in net interest income $ (38,050) $ (56,545) $ 13,140 _______________________ (1) Relates to derivatives for which variation margin payments are characterized as daily settled contracts. (2) Represents interest income/expense on derivatives in qualifying fair-value hedging relationships. Net interest settlements on derivatives that are not in qualifying fair-value hedging relationships are reported in other income. (3) Excludes the interest income/expense of the respective hedged items recorded in net interest income. Table 6.3 presents the net gains (losses) on qualifying cash flow hedging relationships. Table 6.3 - Net Gains (Losses) on Cash Flow Hedging Relationships (dollars in thousands) For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 Forward-start interest rate swaps - CO Bonds Losses reclassified from accumulated other comprehensive income into interest expense $ (1,453) $ (1,788) $ (4,516) $ (5,318) Gains (losses) recognized in other comprehensive income 8,672 15 (366) (1,264) Table 6.5 - Net Gains and Losses on Derivatives and Hedging Activities (dollars in thousands) For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 Derivatives not designated as hedging instruments: Economic hedges: Interest-rate swaps $ (785) $ 1,201 $ (778) $ (53,171) CO bond firm commitments 302 — 321 — Mortgage-delivery commitments 94 409 (339) 979 Total net (losses) gains related to derivatives not designated as hedging instruments (389) 1,610 (796) (52,192) Other (1) 2 14 8 97 Net (losses) gains on derivatives $ (387) $ 1,624 $ (788) $ (52,095) ______________________ (1) Consists of price alignment amount on derivatives for which variation margin is characterized as a daily settlement amount.
Gains (Losses) By Type of Hedged Item [Table Text Block]	Table 6.4 - Cumulative Basis Adjustments for Fair-Value Hedges (dollars in thousands) September 30, 2021 Line Item in Statement of Condition Amortized Cost of Hedged Asset/ Liability (1) Basis Adjustments for Active Hedging Relationships Included in Amortized Cost Basis Adjustments for Discontinued Hedging Relationships Included in Amortized Cost Cumulative Amount of Fair Value Hedging Basis Adjustments Advances $ 3,707,970 $ 66,188 $ 10,672 $ 76,860 Available-for-sale securities 10,115,287 306,503 — 306,503 Consolidated obligation bonds 11,688,992 (70,193) 36,965 (33,228) _______________________ (1) Includes only the portion of amortized cost representing the hedged items in fair-value hedging relationships.
Derivatives Not Designated as Hedging Instruments [Table Text Block]	Table 6.5 - Net Gains and Losses on Derivatives and Hedging Activities (dollars in thousands) For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 Derivatives not designated as hedging instruments: Economic hedges: Interest-rate swaps $ (785) $ 1,201 $ (778) $ (53,171) CO bond firm commitments 302 — 321 — Mortgage-delivery commitments 94 409 (339) 979 Total net (losses) gains related to derivatives not designated as hedging instruments (389) 1,610 (796) (52,192) Other (1) 2 14 8 97 Net (losses) gains on derivatives $ (387) $ 1,624 $ (788) $ (52,095) ______________________ (1) Consists of price alignment amount on derivatives for which variation margin is characterized as a daily settlement amount.
Post-haircut Value of Incremental Collateral Based on Incremental Credit Rating Downgrades [Table Text Block]	Table 6.6 sets forth the post-haircut value of incremental collateral that certain uncleared derivatives counterparties could have required us to deliver based on incremental credit rating downgrades at September 30, 2021. Table 6.6 - Post Haircut Value of Incremental Collateral to be Delivered as of September 30, 2021 (dollars in thousands) Ratings Downgrade (1) From To Incremental Collateral AA+ AA or AA- $ — AA- A+, A or A- — A- below A- 27,758 _______________________ (1) Ratings are expressed in this table according to S&P's conventions but include the equivalent of such rating by Moody's. If there is a split rating, the lower rating is used.
Offsetting Assets [Table Text Block]	Table 6.7 presents separately the fair value of derivatives that are subject to netting due to a legal right of offset based on the terms of our master netting arrangements or similar agreements as of September 30, 2021, and December 31, 2020, and the fair value of derivatives that are not subject to such netting. Derivatives subject to netting include any related cash collateral received from or pledged to counterparties. Table 6.7 - Netting of Derivative Assets and Derivative Liabilities (dollars in thousands) September 30, 2021 Derivative Instruments Meeting Netting Requirements Derivative Instruments Not Meeting Netting Requirements Total Derivative Assets and Total Derivative Liabilities Non-cash Collateral (Received) or Pledged Not Offset (2) Gross Recognized Amount Gross Amounts of Netting Adjustments (1) Net Amount Derivative Assets Interest-rate swaps Uncleared $ 5,785 $ (4,496) $ 1,289 $ — $ 1,289 Cleared 3,633 350,996 354,629 — 354,629 CO bond firm commitment $ 296 296 296 Mortgage delivery commitment 47 47 47 Total $ 356,261 $ 356,261 Derivative Liabilities Interest-rate swaps Uncleared $ (107,219) $ 85,834 $ (21,385) $ 17,220 $ (4,165) Cleared (7,632) 7,632 — — — Mortgage delivery commitment $ (16) (16) (16) Total $ (21,401) $ (4,181) December 31, 2020 Derivative Instruments Meeting Netting Requirements Derivative Instruments Not Meeting Netting Requirements Total Derivative Assets and Total Derivative Liabilities Non-cash Collateral (Received) or Pledged Not Offset (2) Gross Recognized Amount Gross Amounts of Netting Adjustments (1) Net Amount Derivative Assets Interest-rate swaps Uncleared $ 5,215 $ (4,899) $ 316 $ — $ 316 Cleared 4,747 155,955 160,702 — 160,702 Mortgage delivery commitment $ 220 220 220 Total $ 161,238 $ 161,238 Derivative Liabilities Interest-rate swaps Uncleared $ (82,625) $ 58,563 $ (24,062) $ 23,087 $ (975) Cleared (6,145) 6,145 — — — Total $ (24,062) $ (975) _______________________ (1) Includes gross amounts of netting adjustments and cash collateral. (2) Includes non-cash collateral at fair value that cannot be sold or repledged by the counterparty. Additionally, any overcollateralization with a counterparty is not included in the determination of the net amount. At September 30, 2021,
Offsetting Liabilities [Table Text Block]	Table 6.7 presents separately the fair value of derivatives that are subject to netting due to a legal right of offset based on the terms of our master netting arrangements or similar agreements as of September 30, 2021, and December 31, 2020, and the fair value of derivatives that are not subject to such netting. Derivatives subject to netting include any related cash collateral received from or pledged to counterparties. Table 6.7 - Netting of Derivative Assets and Derivative Liabilities (dollars in thousands) September 30, 2021 Derivative Instruments Meeting Netting Requirements Derivative Instruments Not Meeting Netting Requirements Total Derivative Assets and Total Derivative Liabilities Non-cash Collateral (Received) or Pledged Not Offset (2) Gross Recognized Amount Gross Amounts of Netting Adjustments (1) Net Amount Derivative Assets Interest-rate swaps Uncleared $ 5,785 $ (4,496) $ 1,289 $ — $ 1,289 Cleared 3,633 350,996 354,629 — 354,629 CO bond firm commitment $ 296 296 296 Mortgage delivery commitment 47 47 47 Total $ 356,261 $ 356,261 Derivative Liabilities Interest-rate swaps Uncleared $ (107,219) $ 85,834 $ (21,385) $ 17,220 $ (4,165) Cleared (7,632) 7,632 — — — Mortgage delivery commitment $ (16) (16) (16) Total $ (21,401) $ (4,181) December 31, 2020 Derivative Instruments Meeting Netting Requirements Derivative Instruments Not Meeting Netting Requirements Total Derivative Assets and Total Derivative Liabilities Non-cash Collateral (Received) or Pledged Not Offset (2) Gross Recognized Amount Gross Amounts of Netting Adjustments (1) Net Amount Derivative Assets Interest-rate swaps Uncleared $ 5,215 $ (4,899) $ 316 $ — $ 316 Cleared 4,747 155,955 160,702 — 160,702 Mortgage delivery commitment $ 220 220 220 Total $ 161,238 $ 161,238 Derivative Liabilities Interest-rate swaps Uncleared $ (82,625) $ 58,563 $ (24,062) $ 23,087 $ (975) Cleared (6,145) 6,145 — — — Total $ (24,062) $ (975) _______________________ (1) Includes gross amounts of netting adjustments and cash collateral. (2) Includes non-cash collateral at fair value that cannot be sold or repledged by the counterparty. Additionally, any overcollateralization with a counterparty is not included in the determination of the net amount. At September 30, 2021,

Deposits (Tables)

Deposits (Tables)	9 Months Ended
Deposits (Tables)	Sep. 30, 2021
Deposits [Abstract]
Interest-bearing and Non-interest-bearing Deposits [Table Text Block]	Table 7.1 - Deposits (dollars in thousands) September 30, 2021 December 31, 2020 Interest-bearing Demand and overnight $ 901,388 $ 975,469 Other 1,882 2,525 Noninterest-bearing Other 67,462 110,993 Total deposits $ 970,732 $ 1,088,987

Consolidated Obligations (Table

Consolidated Obligations (Tables)	9 Months Ended
Consolidated Obligations (Tables)	Sep. 30, 2021
Debt Disclosure [Abstract]
CO Bonds by Year of Contractual Maturity [Table Text Block]	Table 8.1 - CO Bonds Outstanding by Contractual Maturity (dollars in thousands) September 30, 2021 December 31, 2020 Amount Weighted Average Rate (1) Amount Weighted Average Rate (1) Due in one year or less $ 6,855,555 0.79 % $ 10,608,465 0.81 % Due after one year through two years 3,197,000 1.25 3,956,120 1.35 Due after two years through three years 2,475,105 1.45 1,569,315 2.20 Due after three years through four years 2,941,270 0.95 1,141,430 2.43 Due after four years through five years 5,398,465 0.87 1,776,100 1.12 Thereafter 4,225,785 2.06 2,312,155 3.58 Total par value 25,093,180 1.16 % 21,363,585 1.42 % Premiums 47,269 58,537 Discounts (9,752) (12,278) Hedging adjustments (33,228) 61,746 Total $ 25,097,469 $ 21,471,590 _______________________ (1) The CO bonds' weighted-average rate excludes concession fees. Table 8.3 - CO Bonds Outstanding by Contractual Maturity or Next Call Date (dollars in thousands) September 30, 2021 December 31, 2020 Due in one year or less $ 17,007,555 $ 11,728,465 Due after one year through two years 3,599,000 4,046,120 Due after two years through three years 1,255,105 1,629,315 Due after three years through four years 1,551,270 1,011,430 Due after four years through five years 599,465 1,501,100 Thereafter 1,080,785 1,447,155 Total par value $ 25,093,180 $ 21,363,585
CO Bonds Long-term Debt Instruments [Table Text Block]	Table 8.2 - CO Bonds Outstanding by Call Feature (dollars in thousands) September 30, 2021 December 31, 2020 Noncallable and nonputable $ 14,401,180 $ 19,668,585 Callable 10,692,000 1,695,000 Total par value $ 25,093,180 $ 21,363,585 Table 8.4 - CO Bonds by Interest Rate-Payment Type (dollars in thousands) September 30, 2021 December 31, 2020 Fixed-rate $ 16,612,180 $ 12,524,585 Simple variable-rate 4,903,000 8,549,000 Step-up (1) 3,578,000 290,000 Total par value $ 25,093,180 $ 21,363,585 _______________________ (1) Step-up bonds pay interest at increasing fixed rates for specified intervals over the life of the CO bond and can be called at our option on the step-up dates.
CO Discount Notes [Table Text Block]	CO Discount Notes. Outstanding CO discount notes for which we were primarily liable, all of which are due within one year, were as follows: Table 8.5 - CO Discount Notes Outstanding (dollars in thousands) Book Value Par Value Weighted Average Rate (1) September 30, 2021 $ 5,554,103 $ 5,554,519 0.04 % December 31, 2020 $ 12,878,310 $ 12,879,765 0.10 % _______________________ (1) CO discount notes' weighted-average rate represents a yield to maturity excluding concession fees.

Affordable Housing Program (Tab

Affordable Housing Program (Tables)	9 Months Ended
Affordable Housing Program (Tables)	Sep. 30, 2021
Affordable Housing Program (AHP) [Abstract]
Roll-forward of the AHP Liability[Table Text Block]	Table 9.1 - AHP Liability (dollars in thousands) For the Nine Months Ended September 30, 2021 For the Year Ended December 31, 2020 Balance at beginning of year $ 78,640 $ 86,131 AHP expense for the period 4,852 13,386 AHP voluntary contribution 6,023 1,614 AHP direct grant disbursements (14,690) (21,374) AHP subsidy for AHP advance disbursements (5,512) (1,216) Return of previously disbursed grants and subsidies 3,135 99 Balance at end of period $ 72,448 $ 78,640

Capital (Tables)

Capital (Tables)	9 Months Ended
Capital (Tables)	Sep. 30, 2021
Banking Regulation, Total Capital [Abstract]
Compliance with Regulatory Capital Requirements [Table Text Block]	Table 10.1 - Regulatory Capital Requirements (dollars in thousands) Risk-Based Capital Requirements September 30, December 31, Permanent capital Class B capital stock $ 1,028,177 $ 1,267,172 Mandatorily redeemable capital stock 13,890 6,282 Retained earnings 1,527,929 1,498,642 Total permanent capital $ 2,569,996 $ 2,772,096 Risk-based capital requirement Credit-risk capital $ 85,086 $ 96,143 Market-risk capital 222,735 204,028 Operations-risk capital 92,346 90,052 Total risk-based capital requirement $ 400,167 $ 390,223 Permanent capital in excess of risk-based capital requirement $ 2,169,829 $ 2,381,873 September 30, 2021 December 31, 2020 Required Actual Required Actual Capital Ratio Risk-based capital $ 400,167 $ 2,569,996 $ 390,223 $ 2,772,096 Total regulatory capital 1,377,957 2,569,996 1,538,441 2,772,096 Total capital-to-asset ratio 4.0 % 7.5 % 4.0 % 7.2 % Leverage Ratio Leverage capital $ 1,722,446 $ 3,854,994 $ 1,923,052 $ 4,158,144 Leverage capital-to-assets ratio 5.0 % 11.2 % 5.0 % 10.8 %

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	9 Months Ended
Accumulated Other Comprehensive Loss (Tables)	Sep. 30, 2021
AOCI Attributable to Parent [Abstract]
Schedule of Accumulated Other Comprehensive Loss [Table Text Block]	Accumulated Other Comprehensive Income (Loss) (dollars in thousands) Net Unrealized Gain (Loss) on Available-for-sale Securities Noncredit Portion of Other-than-temporary Impairment Losses on Held-to-maturity Securities Net Unrealized (Loss) Gain Relating to Hedging Activities Pension and Postretirement Benefits Total Balance, June 30, 2020 $ (44,000) $ (50,407) $ (27,956) $ (6,108) $ (128,471) Other comprehensive income (loss) before reclassifications: Adjustment for transfer of securities from held-to-maturity to available-for-sale 16,062 31,502 — — 47,564 Net unrealized gains 62,434 — 15 — 62,449 Noncredit losses included in basis of securities sold — 18,905 — — 18,905 Net actuarial loss — — — (382) (382) Reclassifications from other comprehensive income to net income Reclassification of realized net gains included in net income (26,210) — — — (26,210) Amortization - hedging activities (1) — — 1,788 — 1,788 Amortization - pension and postretirement benefits (2) — — — 290 290 Other comprehensive income (loss) 52,286 50,407 1,803 (92) 104,404 Balance, September 30, 2020 $ 8,286 $ — $ (26,153) $ (6,200) $ (24,067) Balance, June 30, 2021 $ 84,460 $ — $ (30,340) $ (6,475) $ 47,645 Other comprehensive income (loss) before reclassifications: Net unrealized (losses) gains (17,961) — 8,672 — (9,289) Net actuarial gain — — — 646 646 Reclassifications from other comprehensive income to net income Amortization - hedging activities (1) — — 1,453 — 1,453 Amortization - pension and postretirement benefits (2) — — — 149 149 Other comprehensive (loss) income (17,961) — 10,125 795 (7,041) Balance, September 30, 2021 $ 66,499 $ — $ (20,215) $ (5,680) $ 40,604 Net Unrealized Gain (Loss) on Available-for-sale Securities Noncredit Portion of Other-than-temporary Impairment Losses on Held-to-maturity Securities Net Unrealized (Loss) Gain Relating to Hedging Activities Pension and Postretirement Benefits Total Balance, December 31, 2019 $ (73,922) $ (76,036) $ (30,207) $ (6,807) $ (186,972) Other comprehensive income (loss) before reclassifications: Adjustment for transfer of securities from held-to-maturity to available-for-sale 16,062 31,502 — — 47,564 Net unrealized gains (losses) 92,356 — (1,264) — 91,092 Noncredit losses included in basis of securities sold — 39,144 — — 39,144 Accretion of noncredit loss — 5,390 — — 5,390 Net actuarial loss — — — (270) (270) Reclassifications from other comprehensive income to net income Reclassification of realized net gains included in net income (26,210) — — — (26,210) Amortization - hedging activities (1) — — 5,318 — 5,318 Amortization - pension and postretirement benefits (2) — — — 877 877 Other comprehensive income 82,208 76,036 4,054 607 162,905 Balance, September 30, 2020 $ 8,286 $ — $ (26,153) $ (6,200) $ (24,067) Balance, December 31, 2020 $ 48,568 $ — $ (24,365) $ (8,064) $ 16,139 Other comprehensive income (loss) before reclassifications: Net unrealized gains (losses) 17,931 — (366) — 17,565 Net actuarial gain — — — 1,938 1,938 Reclassifications from other comprehensive income to net income Amortization - hedging activities (1) — — 4,516 — 4,516 Amortization - pension and postretirement benefits (2) — — — 446 446 Other comprehensive income 17,931 — 4,150 2,384 24,465 Balance, September 30, 2021 $ 66,499 $ — $ (20,215) $ (5,680) $ 40,604 _______________________ (1) Recorded in CO bond interest expense. (2) Recorded in other expenses in the statement of operations.

Fair Values (Tables)

Fair Values (Tables)	9 Months Ended
Fair Values (Tables)	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments [Table Text Block]	Table 12.1 presents the carrying value, fair value, and fair-value hierarchy of our financial assets and liabilities at September 30, 2021, and December 31, 2020. We record trading securities, available-for-sale securities, derivative assets, derivative liabilities, and certain other assets at fair value on a recurring basis and certain mortgage loans, and certain other assets at fair value on a non-recurring basis. We record all other financial assets and liabilities at amortized cost. Refer to Table 12.2 for further details about the financial assets and liabilities held at fair value on either a recurring or non-recurring basis. Table 12.1 - Fair Value Summary (dollars in thousands) September 30, 2021 Carrying Value Total Fair Value Level 1 Level 2 Level 3 Netting Adjustments and Cash Collateral (2) Financial instruments Assets: Cash and due from banks $ 205,284 $ 205,284 $ 205,284 $ — $ — $ — Interest-bearing deposits 149 149 149 — — — Securities purchased under agreements to resell 500,000 500,000 — 500,000 — — Federal funds sold 1,848,000 1,848,000 — 1,848,000 — — Trading securities (1) 1,759,851 1,759,851 — 1,759,851 — — Available-for-sale securities (1) 12,132,257 12,132,257 — 12,058,415 73,842 — Held-to-maturity securities 164,167 167,598 — 167,598 — — Advances 14,056,991 14,223,804 — 14,223,804 — — Mortgage loans, net 3,283,925 3,424,954 — 3,392,839 32,115 — Accrued interest receivable 74,470 74,470 — 74,470 — — Derivative assets (1) 356,261 356,261 — 9,761 — 346,500 Other assets (1) 39,728 39,728 16,616 23,112 — — Liabilities: Deposits (970,732) (970,731) — (970,731) — — COs: Bonds (25,097,469) (25,466,219) — (25,466,219) — — Discount notes (5,554,103) (5,554,255) — (5,554,255) — — Mandatorily redeemable capital stock (13,890) (13,890) (13,890) — — — Accrued interest payable (59,159) (59,159) — (59,159) — — Derivative liabilities (1) (21,401) (21,401) — (114,867) — 93,466 Other: Commitments to extend credit for advances — (6,407) — (6,407) — — Standby letters of credit (972) (972) — (972) — — December 31, 2020 Carrying Value Total Fair Value Level 1 Level 2 Level 3 Netting Adjustments and Cash Collateral (2) Financial instruments Assets: Cash and due from banks $ 2,050,028 $ 2,050,028 $ 2,050,028 $ — $ — $ — Interest-bearing deposits 299,149 299,149 299,149 — — — Securities purchased under agreements to resell 750,000 749,995 — 749,995 — — Federal funds sold 2,260,000 2,259,988 — 2,259,988 — — Trading securities (1) 3,605,079 3,605,079 — 3,605,079 — — Available-for-sale securities (1) 6,220,148 6,220,148 — 6,097,599 122,549 — Held-to-maturity securities 207,162 211,837 — 211,837 — — Advances 18,817,002 19,119,220 — 19,119,220 — — Mortgage loans, net 3,930,252 4,136,004 — 4,086,757 49,247 — Accrued interest receivable 87,582 87,582 — 87,582 — — Derivative assets (1) 161,238 161,238 — 10,182 — 151,056 Other assets (1) 34,360 34,360 14,296 20,064 — — Liabilities: Deposits (1,088,987) (1,088,981) — (1,088,981) — — COs: Bonds (21,471,590) (22,062,476) — (22,062,476) — — Discount notes (12,878,310) (12,878,918) — (12,878,918) — — Mandatorily redeemable capital stock (6,282) (6,282) (6,282) — — — Accrued interest payable (61,918) (61,918) — (61,918) — — Derivative liabilities (1) (24,062) (24,062) — (88,770) — 64,708 Other: Commitments to extend credit for advances — (5,306) — (5,306) — — Standby letters of credit (1,303) (1,303) — (1,303) — — _______________________ (1) Carried at fair value and measured on a recurring basis. (2) These amounts represent the effect of master-netting agreements intended to allow us to settle positive and negative positions and also cash collateral and related accrued interest held or placed with the same clearing member and/or counterparty.
Fair Value Measured on Recurring and Nonrecurring Basis [Table Text Block]	Table 12.2 - Fair Value of Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis (dollars in thousands) September 30, 2021 Level 1 Level 2 Level 3 Netting Adjustments and Cash Collateral (1) Total Assets: Carried at fair value on a recurring basis Trading securities: Corporate bonds $ — $ 1,524 $ — $ — $ 1,524 U.S. Treasury obligations — 1,756,149 — — 1,756,149 U.S. government-guaranteed – single-family MBS — 2,133 — — 2,133 GSE – single-family MBS — 45 — — 45 Total trading securities — 1,759,851 — — 1,759,851 Available-for-sale securities: HFA securities — — 73,842 — 73,842 Supranational institutions — 411,601 — — 411,601 U.S. Treasury obligations — 4,387,672 — — 4,387,672 U.S. government-owned corporations — 304,506 — — 304,506 GSE — 126,308 — — 126,308 U.S. government guaranteed – single-family MBS — 23,025 — — 23,025 U.S. government guaranteed – multifamily MBS — 453,891 — — 453,891 GSE – single-family MBS — 1,223,504 — — 1,223,504 GSE – multifamily MBS — 5,127,908 — — 5,127,908 Total available-for-sale securities — 12,058,415 73,842 — 12,132,257 Derivative assets: Interest-rate-exchange agreements — 9,418 — 346,500 355,918 CO bond firm commitments — 296 — — 296 Mortgage delivery commitments — 47 — — 47 Total derivative assets — 9,761 — 346,500 356,261 Other assets 16,616 23,112 — — 39,728 Total assets carried at fair value on a recurring basis $ 16,616 $ 13,851,139 $ 73,842 $ 346,500 $ 14,288,097 Carried at fair value on a nonrecurring basis (2) Mortgage loans held for portfolio $ — $ — $ 3,736 $ — $ 3,736 REO — — 59 — 59 Total assets carried at fair value on a nonrecurring basis $ — $ — $ 3,795 $ — $ 3,795 Liabilities: Carried at fair value on a recurring basis Derivative liabilities Interest-rate-exchange agreements $ — $ (114,851) $ — $ 93,466 $ (21,385) Mortgage delivery commitments — (16) — — (16) Total liabilities carried at fair value on a recurring basis $ — $ (114,867) $ — $ 93,466 $ (21,401) December 31, 2020 Level 1 Level 2 Level 3 Netting Adjustments and Cash Collateral (1) Total Assets: Carried at fair value on a recurring basis Trading securities: Corporate bonds $ — $ 5,422 $ — $ — $ 5,422 U.S. Treasury obligations — 3,596,718 — — 3,596,718 U.S. government-guaranteed – single-family MBS — 2,884 — — 2,884 GSE – single-family MBS — 55 — — 55 Total trading securities — 3,605,079 — — 3,605,079 Available-for-sale securities: HFA securities — — 122,549 — 122,549 Supranational institutions — 430,069 — — 430,069 U.S. government-owned corporations — 322,061 — — 322,061 GSE — 134,992 — — 134,992 U.S. government guaranteed – single-family MBS — 29,408 — — 29,408 U.S. government guaranteed – multifamily MBS — 47,180 — — 47,180 GSE – single-family MBS — 1,469,048 — — 1,469,048 GSE – multifamily MBS — 3,664,841 — — 3,664,841 Total available-for-sale securities — 6,097,599 122,549 — 6,220,148 Derivative assets: Interest-rate-exchange agreements — 9,962 — 151,056 161,018 Mortgage delivery commitments — 220 — — 220 Total derivative assets — 10,182 — 151,056 161,238 Other assets 14,296 20,064 — — 34,360 Total assets carried at fair value on a recurring basis $ 14,296 $ 9,732,924 $ 122,549 $ 151,056 $ 10,020,825 Carried at fair value on a nonrecurring basis (2) Mortgage loans held for portfolio $ — $ — $ 10,782 $ — $ 10,782 REO — — 245 — 245 Total assets carried at fair value on a nonrecurring basis $ — $ — $ 11,027 $ — $ 11,027 Liabilities: Carried at fair value on a recurring basis Derivative liabilities Interest-rate-exchange agreements $ — $ (88,770) $ — $ 64,708 $ (24,062) Total liabilities carried at fair value on a recurring basis $ — $ (88,770) $ — $ 64,708 $ (24,062) _______________________ (1) These amounts represent the effect of master-netting agreements intended to allow us to settle positive and negative positions and also cash collateral and related accrued interest held or placed with the same clearing member and/or counterparty. (2) We measure certain held-to-maturity investment securities, mortgage loans held for portfolio, and REO at fair value on a nonrecurring basis, that is, they are not measured at fair value on an ongoing basis but are subject to fair-value adjustments only in certain circumstances. The fair values presented are as of the date the fair value adjustment was recorded.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]	Table 12.3 presents a reconciliation of available-for-sale HFA securities that are measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the three and nine months ended September 30, 2021 and 2020. Table 12.3 - Roll Forward of Level 3 Available-for-Sale Securities (dollars in thousands) HFA Securities For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 Balance at beginning of period $ 86,077 $ 59,463 $ 122,549 $ 64,652 Transfer of securities from held-to-maturity to available-for-sale — 71,240 — 71,240 Total net unrealized gains included in other comprehensive income 125 3,040 3,458 5,451 Maturities and settlements Maturities (12,360) (7,995) (50,720) (15,595) Settlements — — (1,445) — Balance at end of period $ 73,842 $ 125,748 $ 73,842 $ 125,748 Total amount of unrealized gains for the period included in other comprehensive income relating to securities held at period end $ 125 $ 2,384 $ 342 $ 4,758 Private-label MBS For the Three Months Ended September 30, 2020 For the Nine Months Ended September 30, 2020 Balance at beginning of period $ — $ — Transfer of securities from held-to-maturity to available-for-sale 180,514 180,514 Total gains included in earnings Net gains on sale 26,210 26,210 Reduction of provision for credit losses 211 211 Accretion 272 272 Total gains included in other comprehensive income Total net unrealized gains included in other comprehensive income (17,098) (17,098) Maturities and settlements Sales (165,439) (165,439) Maturities — — Settlements (1,892) (1,892) Balance at end of period $ 22,778 $ 22,778 Total amount of unrealized gains for the period included in other comprehensive income relating to securities held at period end $ 617 $ 617 Total amount of gains for the period included in earnings attributable to the provision for credit losses and accretion of discounts relating to securities held at period end $ 415 $ 415

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
Commitments and Contingencies (Tables)	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Off-Balance Sheet Commitments [Table Text Block]	Table 13.1 - Off-Balance Sheet Commitments (1) (dollars in thousands) September 30, 2021 December 31, 2020 Expire within one year Expire after one year Total Expire within one year Expire after one year Total Standby letters of credit outstanding (2) $ 5,112,384 $ 200,788 $ 5,313,172 $ 6,190,479 $ 233,771 $ 6,424,250 Commitments for unused lines of credit - advances (3) 1,120,311 — 1,120,311 1,127,432 — 1,127,432 Commitments to make additional advances 50,940 72,646 123,586 69,684 93,465 163,149 Commitments to invest in mortgage loans 8,019 — 8,019 28,386 — 28,386 Unsettled CO bonds, at par 597,000 — 597,000 — — — Unsettled CO discount notes, at par — — — 250,000 — 250,000 __________________________ (1) We have determined that it is unnecessary to record any liability for credit losses on these agreements. (2) The amount of standby letters of credit outstanding excludes commitments to issue standby letters of credit that expire within one year. At September 30, 2021, and December 31, 2020, these amounts totaled $81.5 million and $37.1 million, respectively. Also excluded are commitments to issue standby letters of credit that expire after one year totaling $25 thousand at December 31, 2020. (3) Commitments for unused line-of-credit advances are generally for periods of up to 12 months. Since many of these commitments are not expected to be drawn upon, the total commitment amount does not necessarily indicate future liquidity requirements.

Transactions with Shareholders

Transactions with Shareholders (Tables)	9 Months Ended
Transactions with Shareholders (Tables)	Sep. 30, 2021
Transactions with Shareholders [Abstract]
Schedule of Transactions with Shareholders, Transactions with Directors' Financial Institutions [Table Text Block]	Transactions with Directors' Institutions. We provide, in the ordinary course of business, products and services to members whose officers or directors serve on our board of directors. In accordance with FHFA regulations, transactions with directors' institutions are conducted on the same terms as those with any other member. Table 14.1 - Transactions with Directors' Institutions (dollars in thousands) Capital Stock Outstanding Percent of Total Capital Stock Par Value of Advances Percent of Total Par Value of Advances Total Accrued Interest Receivable Percent of Total September 30, 2021 $ 50,334 4.8 % $ 480,328 3.4 % $ 493 2.3 % December 31, 2020 60,624 4.8 582,765 3.1 651 2.5

Trading Securities by Major Sec

Trading Securities by Major Security Type (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt and Equity Securities, FV-NI [Line Items]
Trading securities	$ 1,759,851	$ 3,605,079
Corporate bonds [Member]
Debt and Equity Securities, FV-NI [Line Items]
Trading securities	1,524	5,422
US Treasury obligations [Member]
Debt and Equity Securities, FV-NI [Line Items]
Trading securities	1,756,149	3,596,718
Other Than MBS [Member]
Debt and Equity Securities, FV-NI [Line Items]
Trading securities	1,757,673	3,602,140
U.S. government guaranteed - single-family MBS [Member]
Debt and Equity Securities, FV-NI [Line Items]
Trading securities	2,133	2,884
GSE – MBS [Member] \| Single Family [Member]
Debt and Equity Securities, FV-NI [Line Items]
Trading securities	45	55
MBS [Member]
Debt and Equity Securities, FV-NI [Line Items]
Trading securities	$ 2,178	$ 2,939

Unrealized and Realized Gains (

Unrealized and Realized Gains (Losses) on Trading Securities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Net unrealized (losses) gains on trading securities held at period end	$ (9,841)	$ (18,318)	$ (25,811)	$ 9,385
Net unrealized and realized losses on trading securities sold or matured during the period	(1,253)	(1,285)	(14,725)	(1,618)
Net unrealized (losses) gains on trading securities	$ (11,094)	$ (19,603)	$ (40,536)	$ 7,767

Available-for-Sale Securities b

Available-for-Sale Securities by Major Security Types (Details) - USD ($) $ in Thousands		Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	$ 12,065,758	$ 6,171,580
Unrealized Gains Amounts Recorded in Accumulated Other Comprehensive Income		122,495	98,264
Unrealized Losses Amounts Recorded in Accumulated Other Comprehensive Income		(55,996)	(49,696)
Available-for-sale securities Fair Value		12,132,257	6,220,148
Available-for-sale securities - accrued interest receivable		24,200	24,000
US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	4,386,399
Unrealized Gains Amounts Recorded in Accumulated Other Comprehensive Income		2,017
Unrealized Losses Amounts Recorded in Accumulated Other Comprehensive Income		(744)
Available-for-sale securities Fair Value		4,387,672
State housing-finance-agency obligations (HFA securities) [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	74,765	126,930
Unrealized Gains Amounts Recorded in Accumulated Other Comprehensive Income		2	0
Unrealized Losses Amounts Recorded in Accumulated Other Comprehensive Income		(925)	(4,381)
Available-for-sale securities Fair Value		73,842	122,549
Supranational institutions [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	417,730	442,225
Unrealized Gains Amounts Recorded in Accumulated Other Comprehensive Income		87	0
Unrealized Losses Amounts Recorded in Accumulated Other Comprehensive Income		(6,216)	(12,156)
Available-for-sale securities Fair Value		411,601	430,069
U.S. government-owned corporations [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	325,580	350,052
Unrealized Gains Amounts Recorded in Accumulated Other Comprehensive Income		0	0
Unrealized Losses Amounts Recorded in Accumulated Other Comprehensive Income		(21,074)	(27,991)
Available-for-sale securities Fair Value		304,506	322,061
GSE [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	130,836	140,136
Unrealized Gains Amounts Recorded in Accumulated Other Comprehensive Income		0	0
Unrealized Losses Amounts Recorded in Accumulated Other Comprehensive Income		(4,528)	(5,144)
Available-for-sale securities Fair Value		126,308	134,992
Other Than MBS [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	5,335,310	1,059,343
Unrealized Gains Amounts Recorded in Accumulated Other Comprehensive Income		2,106	0
Unrealized Losses Amounts Recorded in Accumulated Other Comprehensive Income		(33,487)	(49,672)
Available-for-sale securities Fair Value		5,303,929	1,009,671
U.S. government guaranteed - single-family MBS [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	22,678	29,148
Unrealized Gains Amounts Recorded in Accumulated Other Comprehensive Income		347	260
Unrealized Losses Amounts Recorded in Accumulated Other Comprehensive Income		0	0
Available-for-sale securities Fair Value		23,025	29,408
U.S. government guaranteed-multifamily MBS [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	453,661	46,829
Unrealized Gains Amounts Recorded in Accumulated Other Comprehensive Income		230	351
Unrealized Losses Amounts Recorded in Accumulated Other Comprehensive Income		0	0
Available-for-sale securities Fair Value		453,891	47,180
MBS [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	6,730,448	5,112,237
Unrealized Gains Amounts Recorded in Accumulated Other Comprehensive Income		120,389	98,264
Unrealized Losses Amounts Recorded in Accumulated Other Comprehensive Income		(22,509)	(24)
Available-for-sale securities Fair Value		6,828,328	5,210,477
Single Family [Member] \| GSE – MBS [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	1,205,083	1,442,282
Unrealized Gains Amounts Recorded in Accumulated Other Comprehensive Income		18,486	26,790
Unrealized Losses Amounts Recorded in Accumulated Other Comprehensive Income		(65)	(24)
Available-for-sale securities Fair Value		1,223,504	1,469,048
Multifamily [Member] \| GSE – MBS [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	5,049,026	3,593,978
Unrealized Gains Amounts Recorded in Accumulated Other Comprehensive Income		101,326	70,863
Unrealized Losses Amounts Recorded in Accumulated Other Comprehensive Income		(22,444)	0
Available-for-sale securities Fair Value		$ 5,127,908	$ 3,664,841

[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. Amortized cost excludes accrued interest receivable of $24.2 million and $24.0 million at September 30, 2021, and December 31, 2020, respectively

Available-for-Sale Securities S

Available-for-Sale Securities Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Fair Value	$ 3,028,293	$ 0
Less than 12 Months, Unrealized Losses	(23,253)	0
12 Months or More, Fair Value	888,286	1,007,173
12 Months or More, Unrealized Losses	(32,743)	(49,696)
Total Fair Value	3,916,579	1,007,173
Total Unrealized Losses	(55,996)	(49,696)
US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Fair Value	1,959,169
Less than 12 Months, Unrealized Losses	(744)
12 Months or More, Fair Value	0
12 Months or More, Unrealized Losses	0
Total Fair Value	1,959,169
Total Unrealized Losses	(744)
HFA securities [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Fair Value	0	0
Less than 12 Months, Unrealized Losses	0	0
12 Months or More, Fair Value	60,795	109,780
12 Months or More, Unrealized Losses	(925)	(4,381)
Total Fair Value	60,795	109,780
Total Unrealized Losses	(925)	(4,381)
Supranational institutions [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Fair Value	0	0
Less than 12 Months, Unrealized Losses	0	0
12 Months or More, Fair Value	396,677	430,069
12 Months or More, Unrealized Losses	(6,216)	(12,156)
Total Fair Value	396,677	430,069
Total Unrealized Losses	(6,216)	(12,156)
U.S. government-owned corporations [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Fair Value	0	0
Less than 12 Months, Unrealized Losses	0	0
12 Months or More, Fair Value	304,506	322,061
12 Months or More, Unrealized Losses	(21,074)	(27,991)
Total Fair Value	304,506	322,061
Total Unrealized Losses	(21,074)	(27,991)
GSE [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Fair Value	0	0
Less than 12 Months, Unrealized Losses	0	0
12 Months or More, Fair Value	126,308	134,992
12 Months or More, Unrealized Losses	(4,528)	(5,144)
Total Fair Value	126,308	134,992
Total Unrealized Losses	(4,528)	(5,144)
Other Than MBS [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Fair Value	1,959,169	0
Less than 12 Months, Unrealized Losses	(744)	0
12 Months or More, Fair Value	888,286	996,902
12 Months or More, Unrealized Losses	(32,743)	(49,672)
Total Fair Value	2,847,455	996,902
Total Unrealized Losses	(33,487)	(49,672)
MBS [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Fair Value	1,069,124
Less than 12 Months, Unrealized Losses	(22,509)
12 Months or More, Fair Value	0
12 Months or More, Unrealized Losses	0
Total Fair Value	1,069,124
Total Unrealized Losses	(22,509)
GSEs - single-family [Member] \| GSE – MBS [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Fair Value	87,064	0
Less than 12 Months, Unrealized Losses	(65)	0
12 Months or More, Fair Value	0	10,271
12 Months or More, Unrealized Losses	0	(24)
Total Fair Value	87,064	10,271
Total Unrealized Losses	(65)	$ (24)
GSEs - multifamily [Member] \| GSE – MBS [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Fair Value	982,060
Less than 12 Months, Unrealized Losses	(22,444)
12 Months or More, Fair Value	0
12 Months or More, Unrealized Losses	0
Total Fair Value	982,060
Total Unrealized Losses	$ (22,444)

Available-for-Sale Securities_2

Available-for-Sale Securities by Contractual Maturity (Details) - USD ($) $ in Thousands		Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	$ 12,065,758	$ 6,171,580
Fair Value		12,132,257	6,220,148
Other Than MBS [Member]
Debt Securities, Available-for-sale [Line Items]
Due in one year or less, amortized cost		10,600	10,600
Due in one year or less, fair value		10,591	10,524
Due after one year through five years, amortized cost		1,201,851	169,570
Due after one year through five years, fair value		1,199,354	166,813
Due after five years through 10 years, amortized cost		3,713,611	400,477
Due after five years through 10 years, fair value		3,710,246	389,753
Due after 10 years, amortized cost		409,248	478,696
Due after 10 years, fair value		383,738	442,581
Amortized Cost	[1]	5,335,310	1,059,343
Fair Value		5,303,929	1,009,671
MBS [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	6,730,448	5,112,237
Fair Value		6,828,328	5,210,477
Amortized Cost MBS	[2]	6,730,448	5,112,237
Fair Value MBS	[2]	$ 6,828,328	$ 5,210,477

[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. Amortized cost excludes accrued interest receivable of $24.2 million and $24.0 million at September 30, 2021, and December 31, 2020, respectively
[2]	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.

Held-to-Maturity Securities by

Held-to-Maturity Securities by Major Security Type (Details) - USD ($) $ in Thousands		Sep. 30, 2021	Dec. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity fair value		$ 167,598	$ 211,837
Held-to-maturity securities - accrued interest receivable		233	368
U.S. government guaranteed - single-family MBS [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	[1]	4,567	5,388
Gross Unrecognized Holding Gains		87	103
Gross Unrecognized Holding Losses		0	0
Held-to-maturity fair value		4,654	5,491
GSE – MBS [Member] \| Single Family [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	[1]	159,600	201,774
Gross Unrecognized Holding Gains		3,440	4,681
Gross Unrecognized Holding Losses		(96)	(109)
Held-to-maturity fair value		162,944	206,346
MBS [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	[1]	164,167	207,162
Gross Unrecognized Holding Gains		3,527	4,784
Gross Unrecognized Holding Losses		(96)	(109)
Held-to-maturity fair value		$ 167,598	$ 211,837

[1]	Amortized cost of held-to-maturity securities includes adjustments made to the cost basis of an investment for accretion, amortization, and collection of cash. Amortized cost excludes accrued interest receivable of $233 thousand and $368 thousand at September 30, 2021, and December 31, 2020, respectively.

Transfer of Held-to-Maturity Se

Transfer of Held-to-Maturity Securities to Available-for-Sale Securities (Details) - USD ($) $ in Thousands		Jul. 21, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Jun. 30, 2020
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost of held -to-maturity securities transferred to available-for-sale securities			$ 0	$ 254,217
Allowance for credit losses			0	$ 0	$ 0	$ (5,566)
Held-to-Maturity Securities Carrying Value	[1]		164,167		207,162
GSE – MBS [Member] \| Single Family [Member]
Schedule of Held-to-maturity Securities [Line Items]
Gross Unrecognized Holding Gains			3,440		4,681
Gross Unrecognized Holding Losses			$ (96)		$ (109)
Accounting Standards Update 2020-04 [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost of held -to-maturity securities transferred to available-for-sale securities		$ 254,217
Allowance for credit losses		(634)
Other-Than-Temporary Impairment Recognized in Accumulated Other Comprehensive Loss		(31,502)
Held-to-Maturity Securities Carrying Value		222,081
Gross Unrecognized Holding Gains		54,042
Gross Unrecognized Holding Losses		(6,478)
Fair Value		269,645
Accounting Standards Update 2020-04 [Member] \| HFA securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost of held -to-maturity securities transferred to available-for-sale securities		77,470
Allowance for credit losses		0
Other-Than-Temporary Impairment Recognized in Accumulated Other Comprehensive Loss		0
Held-to-Maturity Securities Carrying Value		77,470
Gross Unrecognized Holding Gains		0
Gross Unrecognized Holding Losses		(6,230)
Fair Value		71,240
Accounting Standards Update 2020-04 [Member] \| GSE – MBS [Member] \| Single Family [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost of held -to-maturity securities transferred to available-for-sale securities		17,802
Allowance for credit losses		0
Other-Than-Temporary Impairment Recognized in Accumulated Other Comprehensive Loss		0
Held-to-Maturity Securities Carrying Value		17,802
Gross Unrecognized Holding Gains		89
Gross Unrecognized Holding Losses		0
Fair Value		17,891
Accounting Standards Update 2020-04 [Member] \| Mortgage-backed Securities, Issued by Private Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost of held -to-maturity securities transferred to available-for-sale securities		158,945
Allowance for credit losses		(634)
Other-Than-Temporary Impairment Recognized in Accumulated Other Comprehensive Loss		(31,502)
Held-to-Maturity Securities Carrying Value		126,809
Gross Unrecognized Holding Gains		53,953
Gross Unrecognized Holding Losses		(248)
Fair Value		$ 180,514

[1]	Fair values of held-to-maturity securities were $167,598 and $211,837 at September 30, 2021, and December 31, 2020, respectively.

Proceeds and Gains (Losses) fro

Proceeds and Gains (Losses) from Sales of Investment Securities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Debt Securities, Available-for-sale, Sale [Abstract]
Proceeds from sale	$ 0	$ 165,439	$ 0	$ 165,439
Amortized cost, net of allowance for credit losses	0	139,229	0	139,229
Gross realized gains from sale	0	26,438	0	26,438
Gross realized losses from sale	0	(228)	0	(228)
Available-for-sale securities sold, realized net gain	0	26,210	0	26,210
Debt Securities, Held-to-maturity, Sale [Abstract]
Proceeds from sale	0	101,107	0	262,850
Less: Carrying value	0	75,522	0	176,293
Less: Noncredit losses recorded in accumulated other comprehensive income	0	18,905	0	39,144
Realized net gain from sale	$ 0	$ 6,680	$ 0	$ 47,413

Allowance for Credit Losses on

Allowance for Credit Losses on Debt Securities (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
		Sep. 30, 2020	Sep. 30, 2020	Jan. 01, 2020
Available-for-sale, Allowance for Credit Loss
Balance at beginning of period		$ 0
Adjustments for cumulative effect of change in accounting principle	[1]	0	$ 0
Transfers		634	634
Reduction of provision for credit losses due to sales of securities		(68)	(68)
Reversal of provision for credit losses		(143)	(143)
Charge-offs		(299)	(299)
Balance at end of year		124	124
Held-to-maturity, Allowance for Credit Loss
Balance at beginning of period		5,566
Adjustments for cumulative effect of change in accounting principle	[1]	0	5,308
Transfer		(634)	(634)
Reduction of provision for credit losses due to sales of securities		(2,423)	(3,205)
Provision for credit losses		(2,509)	(1,469)
Charge-offs		0	0
Balance at end of period		$ 0	$ 0
Cumulative Effect, Period of Adoption, Adjustment \| Accounting Standards Update 2016-13 \| Mortgage-backed Securities, Issued by Private Enterprises [Member] \| Held-to-maturity Securities [Member]
Cumulative effect of change in accounting principle				$ 5,300

[1]	We adopted new accounting guidance for the measurement of credit losses on financial instruments on January 1, 2020. See Item 8 — Financial Statements and Supplementary Data — Notes to Financial Statements — Note 3 — Recently Issued and Adopted Accounting Guidance in the 2020 Annual Report for information on the adoption of Financial Instruments - Credit Losses. Upon adoption of this new accounting guidance, we recorded through a cumulative effect adjustment to retained earnings an increase in the allowance for credit losses associated with held-to-maturity private-label MBS totaling $5.3 million.

Investments Narrative (Details)

Investments Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020
Percentage of short-term investments in interest-bearing deposits, securities purchased under agreements to resell, and federal funds sold assets rated below triple-B	0.00%
Allowance for credit losses for securities purchased under agreements to resell	$ 0
Available for-Sale securities, rated single-A or above, based on amortized cost	100.00%
Held -to-Maturity securities, rated single-A or above, based on amortized cost	100.00%
Allowance for credit losses on Available-for-Sale securities		$ 0	$ 124	$ 0
Allowance for credit losses on held-to-maturity securities	$ 0	$ 0	$ 0	$ 5,566
Available-for-sale Securities [Member]
Allowance for credit losses on Available-for-Sale securities	0
Interest Bearing Deposits and Federal Funds Sold [Member]
Allowance for credit loss	$ 0

Advances - Outstanding by Year

Advances - Outstanding by Year of Contractual Maturity (Details) - USD ($) $ in Thousands		Sep. 30, 2021	Dec. 31, 2020
Federal Home Loan Bank, Advances, Maturity, Rolling Year, Par Value [Abstract]
Overdrawn demand-deposit accounts		$ 97	$ 135
Due in one year or less		5,443,617	9,090,900
Due after one year through two years		2,106,482	2,281,047
Due after two years through three years		1,630,633	2,014,880
Due after three years through four years		2,372,177	1,685,056
Due after four years through five years		1,262,211	2,687,456
Thereafter		1,200,358	945,038
Total par value		14,015,575	18,704,512
Premiums		888	2,248
Discounts		(36,332)	(37,592)
Fair value of bifurcated derivatives	[1]	29,155	44,534
Hedging adjustments		47,705	103,300
Total Advances	[2]	$ 14,056,991	$ 18,817,002
Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Rolling Year [Abstract]
Overdrawn demand-deposit accounts, Weighted average rate		0.59%	0.62%
Due in one year or less, Weighted average rate		1.02%	1.00%
Due after one year through two years, Weighted average rate		2.17%	1.78%
Due after two years through three years, Weighted average rate		1.85%	2.37%
Due after three years through four years, Weighted average rate		1.29%	1.79%
Due after four years through five years, Weighted average rate		1.42%	1.34%
Thereafter, Weighted average rate		2.08%	2.38%
Total Weighted average rate		1.46%	1.43%
Federal Home Loan Bank Advances Receivable
Federal Home Loan Bank, Advances, Maturity, Rolling Year, Par Value [Abstract]
Advances accrued interest receivable		$ 21,500	$ 25,800

[1]	At September 30, 2021, and December 31, 2020, we had certain advances with embedded features that met the requirements to be separated from the host contract and designated as stand-alone derivatives.
[2]	Excludes accrued interest receivable of $21.5 million and $25.8 million at September 30, 2021, and December 31, 2020, respectively.

Advances - Outstanding by Yea_2

Advances - Outstanding by Year of Contractual Maturity or Next Call Date (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Call Date, Rolling Year, Par Value [Abstract]
Overdrawn demand-deposit accounts	$ 97	$ 135
Due in one year or less	6,505,792	10,149,975
Due after one year through two years	1,920,782	2,095,247
Due after two years through three years	1,388,558	1,809,880
Due after three years through four years	2,255,177	1,392,981
Due after four years through five years	758,511	2,335,956
Thereafter	1,186,658	920,338
Total par value	$ 14,015,575	$ 18,704,512

Advances - Outstanding by Yea_3

Advances - Outstanding by Year of Contractual Maturity or Next Put Date (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put or Convert Date, Rolling Year, Par Value [Abstract]
Overdrawn demand-deposit accounts	$ 97	$ 135
Due in one year or less	7,036,042	10,755,575
Due after one year through two years	1,320,482	2,201,797
Due after two years through three years	1,524,633	1,224,380
Due after three years through four years	1,785,252	1,593,056
Due after four years through five years	1,195,211	2,059,531
Thereafter	1,153,858	870,038
Total par value	$ 14,015,575	$ 18,704,512

Advances - by Current Interest

Advances - by Current Interest Rate Terms (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Federal Home Loan Bank, Advances, Fixed Rate [Abstract]
Fixed-rate	$ 11,977,103	$ 16,742,602
Federal Home Loan Bank, Advances, Floating Rate [Abstract]
Variable-rate	2,038,472	1,961,910
Total par value	$ 14,015,575	$ 18,704,512

Advances - Prepayment Fees (Det

Advances - Prepayment Fees (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Federal Home Loan Bank Advances Prepayment Fees [Abstract]
Prepayment fees received from borrowers	$ 6,370	$ 5,834	$ 20,515	$ 13,737
Hedging fair-value adjustments on prepaid advances	(1,172)	(64)	(2,108)	(2,961)
Net discount (premiums) associated with prepaid advances	112	(124)	(1,132)	(128)
Advance prepayment fees recognized in income, net	$ 5,310	$ 5,646	$ 17,275	$ 10,648

Advances - Narratives (Details)

Advances - Narratives (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Federal Home Loan Bank Advances Receivable
Federal Home Loan Bank, Advances [Line Items]
Past due advances	$ 0	$ 0
Nonaccrual status on advances	0	0
Impaired advances	0	0
Troubled debt restructuring related to advances	0		$ 0
Allowance for credit loss on advances	$ 0	$ 0
Minimum [Member]
Federal Home Loan Bank, Advances [Line Items]
Interest rates of advances outstanding	0.00%	0.00%
Maximum [Member]
Federal Home Loan Bank, Advances [Line Items]
Interest rates of advances outstanding	7.72%	7.72%

Mortgage Loans Held for Portf_3

Mortgage Loans Held for Portfolio (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2021	Dec. 31, 2020
Loans and Leases Receivable Disclosure [Line Items]
Par Value		$ 3,233,287	$ 3,870,707
Premiums		50,990	60,050
Discounts		(761)	(1,094)
Deferred derivative gains, net		2,464	3,689
Total mortgage loans held for portfolio	[1]	3,285,980	3,933,352
Less: Allowance for credit losses		(2,055)	(3,100)
Total mortgage loans, net of allowance for credit losses		$ 3,283,925	3,930,252
Fixed-rate 15-year single-family mortgages
Loans and Leases Receivable Disclosure [Line Items]
Original contractual terms		15 years
Fixed-rate 20- and 30-year single-family mortgages \| Minimum [Member]
Loans and Leases Receivable Disclosure [Line Items]
Original contractual terms		20 years
Fixed-rate 20- and 30-year single-family mortgages \| Maximum [Member]
Loans and Leases Receivable Disclosure [Line Items]
Original contractual terms		30 years
Single Family [Member] \| Fixed-rate 15-year single-family mortgages
Loans and Leases Receivable Disclosure [Line Items]
Par Value		$ 297,104	322,713
Single Family [Member] \| Fixed-rate 20- and 30-year single-family mortgages
Loans and Leases Receivable Disclosure [Line Items]
Par Value		2,936,183	3,547,994
Real Estate Loan
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans held for portfolio, accrued interest receivable		$ 16,000	$ 19,300

[1]	Excludes accrued interest receivable of $16.0 million and $19.3 million at September 30, 2021, and December 31, 2020, respectively.

Mortgage Loans Held for Portf_4

Mortgage Loans Held for Portfolio by Collateral/Guarantee Type (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Loans and Leases Receivable Disclosure [Line Items]
Par Value	$ 3,233,287	$ 3,870,707
Government Mortgage Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Par Value	202,578	246,150
Conventional Mortgage Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Par Value	$ 3,030,709	$ 3,624,557

Credit Quality Indicator for Co

Credit Quality Indicator for Conventional Mortgage Loans (Details) - USD ($) $ in Thousands		Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Total amortized cost	[1]	$ 3,285,980	$ 3,933,352
Conventional Mortgage Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Originated five or more years before latest fiscal year		1,270,512	1,284,591
Originated current fiscal year and preceeding four fiscal years		1,808,979	2,397,740
Total amortized cost		3,079,491	3,682,331
Conventional Mortgage Loans [Member] \| Nonperforming Financial Instruments
Financing Receivable, Credit Quality Indicator [Line Items]
Originated five or more years before latest fiscal year		23,921	37,900
Originated current fiscal year and preceeding four fiscal years		22,801	79,765
Total amortized cost		46,722	117,665
Conventional Mortgage Loans [Member] \| Performing Financial Instruments
Financing Receivable, Credit Quality Indicator [Line Items]
Originated five or more years before latest fiscal year		1,246,591	1,246,691
Originated current fiscal year and preceeding four fiscal years		1,786,178	2,317,975
Total amortized cost		3,032,769	3,564,666
Conventional Mortgage Loans [Member] \| Past due 30-59 days delinquent [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Originated five or more years before latest fiscal year		8,528	11,743
Originated current fiscal year and preceeding four fiscal years		10,052	25,058
Total amortized cost		18,580	36,801
Conventional Mortgage Loans [Member] \| Past due 60-89 days delinquent [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Originated five or more years before latest fiscal year		3,109	5,263
Originated current fiscal year and preceeding four fiscal years		947	11,178
Total amortized cost		4,056	16,441
Conventional Mortgage Loans [Member] \| Past due 90 days or more delinquent [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Originated five or more years before latest fiscal year		12,284	20,894
Originated current fiscal year and preceeding four fiscal years		11,802	43,529
Total amortized cost		$ 24,086	$ 64,423

[1]	Excludes accrued interest receivable of $16.0 million and $19.3 million at September 30, 2021, and December 31, 2020, respectively.

Other Delinquency Statistics of

Other Delinquency Statistics of Mortgage Loans (Details) - USD ($) $ in Thousands		Sep. 30, 2021		Dec. 31, 2020
Mortgage Loans Past Due [Line Items]
In process of foreclosure	[1]	$ 1,375		$ 2,803
Serious delinquency rate	[2]	0.94%		2.02%
Recorded Investment in Government Mortgage Loans [Member]
Mortgage Loans Past Due [Line Items]
In process of foreclosure	[1]	$ 1,008		$ 1,041
Serious delinquency rate	[2]	3.11%		6.04%
Past due 90 days or more still accruing interest		$ 5,410		$ 5,592
Loans on nonaccrual status		1,090	[3]	10,101	[4]
Mortgage loans on non-accrual status with no allowance for credit losses		1,100		10,100
Recorded Investment in Conventional Mortgage Loans [Member]
Mortgage Loans Past Due [Line Items]
In process of foreclosure	[1]	$ 367		$ 1,762
Serious delinquency rate	[2]	0.80%		1.75%
Past due 90 days or more still accruing interest		$ 0		$ 0
Loans on nonaccrual status		24,540	[3]	65,039	[4]
Mortgage loans on non-accrual status with no allowance for credit losses		13,600		31,800
Real Estate Loan
Mortgage Loans Past Due [Line Items]
Past due 90 days or more still accruing interest		5,410		5,592
Loans on nonaccrual status		$ 25,630	[3]	$ 75,140	[4]

[1]	Includes loans where the decision of foreclosure or similar alternative such as pursuit of deed-in-lieu of foreclosure has been reported.
[2]	Loans that are 90 days or more past due or in the process of foreclosure expressed as a percentage of the recorded investment in the total loan portfolio class.
[3]	As of September 30, 2021, the conventional and government mortgage loans on nonaccrual status that did not have an associated allowance for credit losses amounted to $13.6 million and $1.1 million, respectively.
[4]	As of December 31, 2020, the conventional and government mortgage loans on nonaccrual status that did not have an associated allowance for credit losses amounted to $31.8 million and $10.1 million, respectively.

Allowance for Credit Losses o_2

Allowance for Credit Losses on Conventional Mortgage Loans (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance, beginning of period				$ 3,100
(Reduction of) provision for credit losses		$ (80)	$ (5,143)	(1,107)	$ (2,924)
Balance, end of period		2,055		2,055
Conventional Mortgage Loans [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance, beginning of period	[1]	2,125	4,602	3,100	500
Adjustment for cumulative effect of change in accounting principle	[1]	0	0	0	2,221
Recoveries (charge-offs)	[1]	10	(3)	62	(83)
(Reduction of) provision for credit losses	[1]	(80)	1	(1,107)	1,962
Balance, end of period	[1]	$ 2,055	$ 4,600	$ 2,055	$ 4,600

[1]	These amounts exclude government mortgage loans because we make no allowance for credit losses based on our investments in government mortgage loans, as discussed below under — Government Mortgage Loans Held for Portfolio

Mortgage Loans Held for Portf_5

Mortgage Loans Held for Portfolio Narrative (Details) - USD ($) $ in Thousands		Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
TDRs suspended under CARES Act Relief		$ 24,500
Par Value		3,233,287		$ 3,870,707
Allowance for credit losses - mortgage loans held for portfolio		2,055		3,100
Government Mortgage Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Par Value		202,578		246,150
Allowance for credit losses - mortgage loans held for portfolio		0		0
COVID19 Forbearance Plan Member \| Government Mortgage Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Par Value		4,300
Conventional Mortgage Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Par Value		3,030,709		3,624,557
Allowance for credit losses - mortgage loans held for portfolio	[1]	2,055	$ 2,125	$ 3,100	$ 4,600	$ 4,602	$ 500
Conventional Mortgage Loans [Member] \| COVID19 Forbearance Plan Member
Financing Receivable, Credit Quality Indicator [Line Items]
Par Value		21,100
Total current loans		$ 3,000
Conventional Mortgage Loans in forbearance as a percentage of mortgage loans held for portfolio		0.60%
Conventional Mortgage Loans [Member] \| COVID19 Forbearance Plan Member \| Past due 30-59 days delinquent [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Par Value		$ 2,200
Conventional Mortgage Loans [Member] \| COVID19 Forbearance Plan Member \| Past due 60-89 days delinquent [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Par Value		2,300
Conventional Mortgage Loans [Member] \| COVID19 Forbearance Plan Member \| Past due 90 days or more delinquent [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Par Value		$ 13,600

[1]	These amounts exclude government mortgage loans because we make no allowance for credit losses based on our investments in government mortgage loans, as discussed below under — Government Mortgage Loans Held for Portfolio

Derivatives and Hedging Activ_3

Derivatives and Hedging Activities Derivatives in Statement of Condition (Details) - USD ($) $ in Thousands		Sep. 30, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount		$ 29,153,190	$ 15,542,683
Derivative Assets, before netting and collateral adjustments		9,761	10,182
Derivative Liabilities, before netting and collateral adjustments		(114,867)	(88,770)
Derivative Asset, netting adjustments and cash collateral including related accrued interest	[1],[2]	346,500	151,056
Derivative Liability, netting adjustments and cash collateral including related accrued interest	[1],[2]	93,466	64,708
Derivative assets		356,261	161,238
Derivative liabilities		(21,401)	(24,062)
Cash collateral and related accrued interest posted		440,000	215,800
Cash collateral and related accrued interest received		0	0
COs - bonds [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets, before netting and collateral adjustments		296
Derivative assets		296
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount		26,675,371	9,977,475
Derivative Assets, before netting and collateral adjustments		6,008	6,044
Derivative Liabilities, before netting and collateral adjustments		(82,961)	(41,014)
Designated as Hedging Instrument [Member] \| Interest-rate swaps [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount		25,284,371	9,960,475
Derivative Assets, before netting and collateral adjustments		6,008	6,044
Derivative Liabilities, before netting and collateral adjustments		(82,585)	(41,000)
Designated as Hedging Instrument [Member] \| Forward-start interest-rate swaps [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount		1,391,000	17,000
Derivative Assets, before netting and collateral adjustments		0	0
Derivative Liabilities, before netting and collateral adjustments		(376)	(14)
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount		2,477,819	5,565,208
Derivative Assets, before netting and collateral adjustments		3,753	4,138
Derivative Liabilities, before netting and collateral adjustments		(31,906)	(47,756)
Not Designated as Hedging Instrument [Member] \| Interest-rate swaps [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount		2,394,800	5,536,822
Derivative Assets, before netting and collateral adjustments		3,410	3,918
Derivative Liabilities, before netting and collateral adjustments		(31,890)	(47,756)
Not Designated as Hedging Instrument [Member] \| COs - bonds [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount		75,000	0
Derivative Assets, before netting and collateral adjustments		296	0
Derivative Liabilities, before netting and collateral adjustments		0	0
Mortgage Receivable [Member] \| Mortgage-delivery commitments [Member]
Derivatives, Fair Value [Line Items]
Derivative assets		47	220
Derivative liabilities		(16)
Mortgage Receivable [Member] \| Not Designated as Hedging Instrument [Member] \| Mortgage-delivery commitments [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	[3]	8,019	28,386
Derivative Assets, before netting and collateral adjustments	[3]	47	220
Derivative Liabilities, before netting and collateral adjustments	[3]	$ (16)	$ 0

[1]	Amounts represent the effect of master-netting agreements intended to allow us to settle positive and negative positions with the same counterparty. Cash collateral including accrued interest posted was $440.0 million and $215.8 million at September 30, 2021, and December 31, 2020, respectively. The change in cash collateral posted is included in the net change in interest-bearing deposits in the statement of cash flows. There was no cash collateral and related accrued interest received at September 30, 2021, and December 31, 2020.
[2]	These amounts represent the effect of master-netting agreements intended to allow us to settle positive and negative positions and also cash collateral and related accrued interest held or placed with the same clearing member and/or counterparty.
[3]	Mortgage-delivery commitments are classified as derivatives with changes in fair value recorded in other income.

Derivatives and Hedging Activ_4

Derivatives and Hedging Activities Derivatives in Statement of Income and Impact on Interest Income/Expense (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Interest income on advances		$ 40,864	$ 71,218	$ 133,646	$ 340,695
Interest income on available-for-sale securities		18,901	17,495	52,737	46,993
Interest expense on consolidated obligations bonds		(48,861)	(82,962)	(164,146)	(300,765)
Advances [Member] \| Interest Rate Contract [Member] \| Interest Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives		13,855	23,278	54,752	(106,522)
Hedged items		(13,691)	(22,865)	(53,831)	105,204
Net changes in fair value before price alignment interest		164	413	921	(1,318)
Price alignment interest	[1]	3	38	19	452
Net interest settlements on derivatives	[2],[3]	(15,531)	(18,663)	(47,398)	(35,971)
Net (losses) gains on qualifying hedging relationships		(15,364)	(18,212)	(46,458)	(36,837)
Amortization/accretion of discontinued hedging relationships		(363)	(383)	(1,767)	(1,213)
Net (losses) gains on derivatives and hedging activities recorded in net interest income		(15,727)	(18,595)	(48,225)	(38,050)
Available-for-sale Securities [Member] \| Interest Rate Contract [Member] \| Interest Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives		68,669	46,086	196,187	(341,805)
Hedged items		(65,848)	(44,264)	(189,916)	333,919
Net changes in fair value before price alignment interest		2,821	1,822	6,271	(7,886)
Price alignment interest	[1]	11	139	76	1,259
Net interest settlements on derivatives	[2],[3]	(32,980)	(20,361)	(84,764)	(49,918)
Net (losses) gains on qualifying hedging relationships		(30,148)	(18,400)	(78,417)	(56,545)
Amortization/accretion of discontinued hedging relationships		0	0	0	0
Net (losses) gains on derivatives and hedging activities recorded in net interest income		(30,148)	(18,400)	(78,417)	(56,545)
COs - bonds [Member] \| Interest Rate Contract [Member] \| Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives		(24,570)	(15,306)	(92,427)	42,327
Hedged items		24,739	15,032	92,898	(43,793)
Net changes in fair value before price alignment interest		169	(274)	471	(1,466)
Price alignment interest	[1]	(1)	(11)	(4)	(196)
Net interest settlements on derivatives	[2],[3]	20,442	7,625	43,912	17,621
Net (losses) gains on qualifying hedging relationships		20,610	7,340	44,379	15,959
Amortization/accretion of discontinued hedging relationships		(847)	(984)	(2,249)	(2,819)
Net (losses) gains on derivatives and hedging activities recorded in net interest income		$ 19,763	$ 6,356	$ 42,130	$ 13,140

[1]	Relates to derivatives for which variation margin payments are characterized as daily settled contracts.
[2]	Excludes the interest income/expense of the respective hedged items recorded in net interest income.
[3]	Represents interest income/expense on derivatives in qualifying fair-value hedging relationships. Net interest settlements on derivatives that are not in qualifying fair-value hedging relationships are reported in other income.

Derivatives and Hedging Activ_5

Derivatives and Hedging Activities Net Gains (Losses) on Cash Flow Hedging Relationships (Details) - Forward-start interest rate swaps [Member] - COs - bonds [Member] - Designated as Hedging Instrument [Member] - Cash Flow Hedging [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Interest Expense [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Losses reclassified from accumulated other comprehensive loss into interest expense	$ (1,453)	$ (1,788)	$ (4,516)	$ (5,318)
Other Comprehensive Income (Loss) [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gains (losses) recognized in other comprehensive income	$ 8,672	$ 15	$ (366)	$ (1,264)

Derivatives and Hedging Activ_6

Derivatives and Hedging Activities Cumulative Basis Adjustments for Fair Value Hedges (Details) $ in Thousands	Sep. 30, 2021USD ($)
Advances [Member]
Derivatives, Fair Value [Line Items]
Amortized Cost of Hedged Asset/(Liability)	$ 3,707,970	[1]
Basis Adjustments for Active Hedging Relationships Included in Amortized Cost	66,188
Basis Adjustments for Discontinued Hedging Relationships Included in Amortized Cost	10,672
Cumulative Amount of Fair Value Hedging Basis Adjustments	76,860
Available-for-sale Securities [Member]
Derivatives, Fair Value [Line Items]
Amortized Cost of Hedged Asset/(Liability)	10,115,287	[1]
Basis Adjustments for Active Hedging Relationships Included in Amortized Cost	306,503
Basis Adjustments for Discontinued Hedging Relationships Included in Amortized Cost	0
Cumulative Amount of Fair Value Hedging Basis Adjustments	306,503
COs - bonds [Member]
Derivatives, Fair Value [Line Items]
Amortized Cost of Hedged Asset/(Liability)	11,688,992	[1]
Basis Adjustments for Active Hedging Relationships Included in Amortized Cost	(70,193)
Basis Adjustments for Discontinued Hedging Relationships Included in Amortized Cost	36,965
Cumulative Amount of Fair Value Hedging Basis Adjustments	$ (33,228)

[1]	Includes only the portion of amortized cost representing the hedged items in fair-value hedging relationships.

Derivatives and Hedging Activ_7

Derivatives and Hedging Activities Derivatives in Statement of Income and Impact on Other Income/Loss (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Total net (losses) gains related to derivatives not designated as hedging instruments		$ (387)	$ 1,624	$ (788)	$ (52,095)
Gain (Loss) on Derivative Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total net (losses) gains related to derivatives not designated as hedging instruments		(389)	1,610	(796)	(52,192)
Gain (Loss) on Derivative Instruments [Member] \| Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other	[1]	2	14	8	97
Gain (Loss) on Derivative Instruments [Member] \| Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net (losses) gains on derivatives		(387)	1,624	(788)	(52,095)
Interest-rate swaps [Member] \| Gain (Loss) on Derivative Instruments [Member] \| Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total net (losses) gains related to derivatives not designated as hedging instruments		(785)	1,201	(778)	(53,171)
COs - bonds [Member] \| Gain (Loss) on Derivative Instruments [Member] \| Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total net (losses) gains related to derivatives not designated as hedging instruments		302	0	321	0
Mortgage Receivable [Member] \| Mortgage-delivery commitments [Member] \| Gain (Loss) on Derivative Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total net (losses) gains related to derivatives not designated as hedging instruments		$ 94	$ 409	$ (339)	$ 979

[1]	Consists of price alignment amount on derivatives for which variation margin is characterized as a daily settlement amount.

Derivatives and Hedging Activ_8

Derivatives and Hedging Activities Fair Value of Derivative Instruments With or Without Legal Rights of Offset (Details) - USD ($) $ in Thousands		Sep. 30, 2021	Dec. 31, 2020
Offsetting Assets [Line Items]
Derivative Asset, netting adjustments and cash collateral	[1],[2]	$ (346,500)	$ (151,056)
Derivative liability, Netting Adjustments and Cash Collateral	[1],[2]	93,466	64,708
Derivative Asset, CO bond firm commitment		9,761	10,182
Derivative assets		356,261	161,238
Derivative liabilities		(21,401)	(24,062)
Derivative Asset, Fair value, amount offset against collateral		356,261	161,238
Derivative Liability, Fair value, amount offset against collateral		(4,181)	(975)
Derivative Liabilities, additional net exposure, collateral pledged to counterparties in excess of net liabilities		1,300	925
Unsettled CO bonds, at par [Member]
Offsetting Assets [Line Items]
Derivative Asset, CO bond firm commitment		296
Derivative assets		296
Derivative Asset, Fair value, amount offset against collateral		296
Uncleared derivatives [Member] \| Interest-rate swaps [Member]
Offsetting Assets [Line Items]
Derivative Asset, total gross recognized amount		5,785	5,215
Derivative Liability, total gross recognized amount		(107,219)	(82,625)
Derivative Asset, netting adjustments and cash collateral	[3]	(4,496)	(4,899)
Derivative liability, Netting Adjustments and Cash Collateral	[3]	85,834	58,563
Derivative assets		1,289	316
Derivative liabilities		(21,385)	(24,062)
Derivative Assets, fair value of securities pledged as collateral that cannot be sold or repledged	[4]	0	0
Derivative Liabilities, fair value of securities pledged as collateral that cannot be sold or repledged	[4]	17,220	23,087
Derivative Asset, Fair value, amount offset against collateral		1,289	316
Derivative Liability, Fair value, amount offset against collateral		(4,165)	(975)
Cleared derivatives [Member] \| Interest-rate swaps [Member]
Offsetting Assets [Line Items]
Derivative Asset, total gross recognized amount		3,633	4,747
Derivative Liability, total gross recognized amount		(7,632)	(6,145)
Derivative Asset, netting adjustments and cash collateral	[3]	350,996	155,955
Derivative liability, Netting Adjustments and Cash Collateral	[3]	7,632	6,145
Derivative assets		354,629	160,702
Derivative liabilities		0	0
Derivative Assets, fair value of securities pledged as collateral that cannot be sold or repledged	[4]	0	0
Derivative Liabilities, fair value of securities pledged as collateral that cannot be sold or repledged	[4]	0	0
Derivative Asset, Fair value, amount offset against collateral		354,629	160,702
Derivative Liability, Fair value, amount offset against collateral		0	0
Mortgage Receivable [Member] \| Mortgage-delivery commitments [Member]
Offsetting Assets [Line Items]
Derivative Asset, Mortgage delivery commitments		47	220
Derivative Liabilities, Mortgage delivery commitments		(16)
Derivative assets		47	220
Derivative liabilities		(16)
Derivative Asset, Fair value, amount offset against collateral		47	$ 220
Derivative Liability, Fair value, amount offset against collateral		$ (16)

[1]	Amounts represent the effect of master-netting agreements intended to allow us to settle positive and negative positions with the same counterparty. Cash collateral including accrued interest posted was $440.0 million and $215.8 million at September 30, 2021, and December 31, 2020, respectively. The change in cash collateral posted is included in the net change in interest-bearing deposits in the statement of cash flows. There was no cash collateral and related accrued interest received at September 30, 2021, and December 31, 2020.
[2]	These amounts represent the effect of master-netting agreements intended to allow us to settle positive and negative positions and also cash collateral and related accrued interest held or placed with the same clearing member and/or counterparty.
[3]	Includes gross amounts of netting adjustments and cash collateral.
[4]	Includes non-cash collateral at fair value that cannot be sold or repledged by the counterparty. Additionally, any overcollateralization with a counterparty is not included in the determination of the net amount. At September 30, 2021, and December 31, 2020, we had additional net credit exposure of $1.3 million and $925 thousand due to instances where our collateral pledged to a counterparty exceeded our net derivative liability position.

Derivatives and Hedging Activ_9

Derivatives and Hedging Activities Narratives (Details) - USD ($)		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020
Derivative [Line Items]
Reclassifications from accumulated other comprehensive loss into earnings as a result of the discontinuance of cash-flow hedges		$ 0	$ 0
Maximum length of time which we are hedging our exposure to the variability in future cash flows for forecasted transactions		10 years
Deferred net losses on derivatives accumulated in other comprehensive loss related to cash flow hedges expected to be reclassified to earnings during the next 12 months		$ 5,700,000
Aggregate fair value of all uncleared derivatives in a net-liability position (before cash collateral and related accrued interest)		101,400,000
Post-haircut value of collateral already posted		99,200,000
Rating Downgrade from AAPlus to AA or AAMinus [Member]
Derivative [Line Items]
Incremental collateral	[1]	0
Rating Downgrade From AAMinus to APlus, A or AMinus [Member]
Derivative [Line Items]
Incremental collateral	[1]	0
Rating Downgrade From AMinus to below AMinus [Member]
Derivative [Line Items]
Incremental collateral	[1]	$ 27,758,000

[1]	Ratings are expressed in this table according to S&P's conventions but include the equivalent of such rating by Moody's. If there is a split rating, the lower rating is used.

Deposits Narratives (Details)

Deposits Narratives (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Deposits [Abstract]
Interest-bearing deposits demand and overnight	$ 901,388	$ 975,469
Interest-bearing deposits other	1,882	2,525
Non-interest bearing deposits other	67,462	110,993
Total deposits	$ 970,732	$ 1,088,987

CO Bonds Outstanding by Contrac

CO Bonds Outstanding by Contractual Maturity (Details) - USD ($) $ in Thousands		Sep. 30, 2021	Dec. 31, 2020
Schedule of Short-term and Long-term Debt [Line Items]
Due in one year or less		$ 6,855,555	$ 10,608,465
Due in one year or less, weighted average rate	[1]	0.79%	0.81%
Due after one year through two years		$ 3,197,000	$ 3,956,120
Due after one year through two years, weighted average rate	[1]	1.25%	1.35%
Due after two years through three years		$ 2,475,105	$ 1,569,315
Due after two years through three years, weighted average rate	[1]	1.45%	2.20%
Due after three years through four years		$ 2,941,270	$ 1,141,430
Due after three years through four years, weighted average rate	[1]	0.95%	2.43%
Due after four years through five years		$ 5,398,465	$ 1,776,100
Due after four years through five years, weighted average rate	[1]	0.87%	1.12%
Thereafter		$ 4,225,785	$ 2,312,155
Thereafter, weighted average rate	[1]	2.06%	3.58%
Total par value		$ 25,093,180	$ 21,363,585
Hedging adjustments		(33,228)	61,746
Total		$ 25,097,469	$ 21,471,590
COs - bonds [Member]
Schedule of Short-term and Long-term Debt [Line Items]
Total par value, weighted average rate	[1]	1.16%	1.42%
Premiums		$ 47,269	$ 58,537
Discounts		$ (9,752)	$ (12,278)

[1]	The CO bonds' weighted-average rate excludes concession fees.

CO Bonds Outstanding by Call Fe

CO Bonds Outstanding by Call Feature (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total par value	$ 25,093,180	$ 21,363,585
Noncallable and nonputable
Debt Instrument [Line Items]
Total par value	14,401,180	19,668,585
Callable
Debt Instrument [Line Items]
Total par value	$ 10,692,000	$ 1,695,000

CO Bonds Outstanding by Contr_2

CO Bonds Outstanding by Contractual Maturity or Next Call Date (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Due in one year or less	$ 6,855,555	$ 10,608,465
Due after one year through two years	3,197,000	3,956,120
Due after two years through three years	2,475,105	1,569,315
Due after three years through four years	2,941,270	1,141,430
Due after four years through five years	5,398,465	1,776,100
Thereafter	4,225,785	2,312,155
Total par value	25,093,180	21,363,585
Earlier Of Contractual Maturity Or Next Call Date [Member]
Debt Instrument [Line Items]
Due in one year or less	17,007,555	11,728,465
Due after one year through two years	3,599,000	4,046,120
Due after two years through three years	1,255,105	1,629,315
Due after three years through four years	1,551,270	1,011,430
Due after four years through five years	599,465	1,501,100
Thereafter	1,080,785	1,447,155
Total par value	$ 25,093,180	$ 21,363,585

CO Bonds by Interest Rate-Payme

CO Bonds by Interest Rate-Payment Type (Details) - USD ($) $ in Thousands		Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total par value		$ 25,093,180	$ 21,363,585
Fixed-rate [Member]
Debt Instrument [Line Items]
Total par value		16,612,180	12,524,585
Simple variable-rate [Member]
Debt Instrument [Line Items]
Total par value		4,903,000	8,549,000
Step-up [Member]
Debt Instrument [Line Items]
Total par value	[1]	$ 3,578,000	$ 290,000

[1]	Step-up bonds pay interest at increasing fixed rates for specified intervals over the life of the CO bond and can be called at our option on the step-up dates.

CO Discount Notes Outstanding (

CO Discount Notes Outstanding (Details) - USD ($) $ in Thousands		Sep. 30, 2021	Dec. 31, 2020
Debt Disclosure [Abstract]
Federal Home Loan Bank, Consolidated Obligations, Discount Notes		$ 5,554,103	$ 12,878,310
Par value		$ 5,554,519	$ 12,879,765
Weighted Average Rate	[1]	0.04%	0.10%

[1]	CO discount notes' weighted-average rate represents a yield to maturity excluding concession fees.

Affordable Housing Program Narr

Affordable Housing Program Narratives (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Affordable Housing Program (AHP) [Abstract]
Balance at beginning of year			$ 78,640	$ 86,131	$ 86,131
AHP expense for the period	$ 1,842	$ 5,957	4,852	10,912	13,386
AHP voluntary contribution	1,234	$ 0	6,023	0	1,614
AHP direct grant disbursements			(14,690)	$ (14,137)	(21,374)
AHP subsidy for AHP advance disbursements			(5,512)		(1,216)
Return of previously disbursed grants and subsidies			3,135		99
Balance at end of period	$ 72,448		$ 72,448		$ 78,640

Regulatory Capital Requirements

Regulatory Capital Requirements (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Banking Regulation, Total Capital [Abstract]
Capital-to-asset ratio, Required	4.00%	4.00%
Leverage capital-to-assets ratio, Required	5.00%	5.00%
Multiplier for Determining Permanent Capital in Leverage Capital Calculation	1.5
Class B capital stock	$ 1,028,177	$ 1,267,172
Mandatorily redeemable capital stock	13,890	6,282
Retained earnings	1,527,929	1,498,642
Total permanent capital	2,569,996	2,772,096
Credit-risk capital	85,086	96,143
Market-risk capital	222,735	204,028
Operations-risk capital	92,346	90,052
Total risk-based capital requirement	400,167	390,223
Permanent capital in excess of risk-based capital requirement	2,169,829	2,381,873
Regulatory capital, Required	1,377,957	1,538,441
Leverage capital, Required	1,722,446	1,923,052
Risk-based capital, Actual	2,569,996	2,772,096
Regulatory capital, Actual	$ 2,569,996	$ 2,772,096
Capital-to-asset ratio, Actual	7.50%	7.20%
Leverage capital, Actual	$ 3,854,994	$ 4,158,144
Leverage capital-to-assets ratio, Actual	11.20%	10.80%

Capital Narratives (Details)

Capital Narratives (Details) - USD ($) $ / shares in Units, $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Restricted retained earnings	$ 368,420	$ 368,420
Contribution requirement - Restricted Retained Earnings	$ 319,800
Certain member assets eligible to secure advances [Member]
Class B stock purchase requirement	0.20%
Overnight advances [Member]
Class B stock purchase requirement	3.00%
All other advances greater than overnight [Member]
Class B stock purchase requirement	4.00%
Outstanding letters of credit [Member]
Class B stock purchase requirement	0.25%
Unpaid principal balance of mortgage purchased through MPF program
Class B stock purchase requirement	4.50%
Common Class B [Member]
Common Stock, Class B, putable par value per share	$ 100
Minimum [Member]
Class B Stock Purchase Requirement Amount	$ 10
Maximum [Member]
Class B Stock Purchase Requirement Amount	$ 10,000

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning of period		$ 2,644,401	$ 2,845,628	$ 2,781,953	$ 3,145,312
Noncredit losses included in basis of securities sold		0	18,905	0	39,144
Total other comprehensive income (loss)		(7,041)	104,404	24,465	162,905
Period end		2,596,710	3,061,087	2,596,710	3,061,087
Net Unrealized (Loss) Gain Relating to Hedging Activities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning of period		(30,340)	(27,956)	(24,365)	(30,207)
Net Unrealized Gains (Losses)		8,672	15	(366)	(1,264)
Amortization - hedging activities	[1]	1,453	1,788	4,516	5,318
Total other comprehensive income (loss)		10,125	1,803	4,150	4,054
Period end		(20,215)	(26,153)	(20,215)	(26,153)
Pension and Postretirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning of period		(6,475)	(6,108)	(8,064)	(6,807)
Net Unrealized Gains (Losses)		0
Net actuarial gain (loss)		646	(382)	1,938	(270)
Amortization - pension and postretirement benefits	[2]	149	290	446	877
Total other comprehensive income (loss)		795	(92)	2,384	607
Period end		(5,680)	(6,200)	(5,680)	(6,200)
Total [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning of period		47,645	(128,471)	16,139	(186,972)
Adjustment for transfer of securities from held-to-maturity to available-for-sale			47,564		47,564
Net Unrealized Gains (Losses)		(9,289)	62,449	17,565	91,092
Noncredit losses included in basis of securities sold			18,905		39,144
Accretion of noncredit loss					5,390
Net actuarial gain (loss)		646	(382)	1,938	(270)
Reclassification of realized net gains included in net income			(26,210)		(26,210)
Amortization - hedging activities	[1]	1,453	1,788	4,516	5,318
Amortization - pension and postretirement benefits	[2]	149	290	446	877
Total other comprehensive income (loss)		(7,041)	104,404	24,465	162,905
Period end		40,604	(24,067)	40,604	(24,067)
Available-for-sale Securities [Member] \| Net Unrealized Loss on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning of period		84,460	(44,000)	48,568	(73,922)
Adjustment for transfer of securities from held-to-maturity to available-for-sale			16,062		16,062
Net Unrealized Gains (Losses)		(17,961)	62,434	17,931	92,356
Reclassification of realized net gains included in net income			(26,210)		(26,210)
Total other comprehensive income (loss)		(17,961)	52,286	17,931	82,208
Period end		66,499	8,286	66,499	8,286
Held-to-maturity Securities [Member] \| Noncredit Portion of Other-Than-Temporary Impairment Losses on Held-to-Maturity Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning of period		0	(50,407)	0	(76,036)
Adjustment for transfer of securities from held-to-maturity to available-for-sale			31,502		31,502
Noncredit losses included in basis of securities sold			18,905		39,144
Accretion of noncredit loss					5,390
Total other comprehensive income (loss)		0	50,407	0	76,036
Period end		$ 0	$ 0	$ 0	$ 0

[1]	Recorded in CO bond interest expense.
[2]	Recorded in other expenses in the statement of operations.

Fair Values Carrying Value and

Fair Values Carrying Value and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands		Sep. 30, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks		$ 205,284	$ 2,050,028
Trading securities		1,759,851	3,605,079
Available-for-sale securities Fair Value		12,132,257	6,220,148
Held-to-Maturity Securities Carrying Value	[1]	164,167	207,162
Held-to-maturity fair value		167,598	211,837
Accrued interest receivable		74,470	87,582
Derivative assets		356,261	161,238
Derivative Assets, Netting Adjustments and Cash Collateral	[2],[3]	346,500	151,056
Mandatorily redeemable capital stock		(13,890)	(6,282)
Accrued interest payable		(59,159)	(61,918)
Derivative liabilities		(21,401)	(24,062)
Derivative liability, Netting Adjustments and Cash Collateral	[2],[3]	93,466	64,708
Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks		205,284	2,050,028
Interest-bearing deposits		149	299,149
Securities purchased under agreements to resell		0	0
Federal funds sold		0	0
Trading securities	[4]	0	0
Available-for-sale securities Fair Value	[4]	0	0
Held-to-maturity fair value		0	0
Advances		0	0
Mortgage loans, net		0	0
Accrued interest receivable		0	0
Derivative assets	[4]	0	0
Other assets	[4]	16,616	14,296
Deposits		0	0
Mandatorily redeemable capital stock		(13,890)	(6,282)
Accrued interest payable		0	0
Derivative liabilities	[4]	0	0
Level 1 [Member] \| Commitments to make additional advances [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other		0	0
Level 1 [Member] \| Standby Letters of Credit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other		0	0
Level 1 [Member] \| COs - Discount notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
CO Discount notes		0	0
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks		0	0
Interest-bearing deposits		0	0
Securities purchased under agreements to resell		500,000	749,995
Federal funds sold		1,848,000	2,259,988
Trading securities	[4]	1,759,851	3,605,079
Available-for-sale securities Fair Value	[4]	12,058,415	6,097,599
Held-to-maturity fair value		167,598	211,837
Advances		14,223,804	19,119,220
Mortgage loans, net		3,392,839	4,086,757
Accrued interest receivable		74,470	87,582
Derivative assets	[4]	9,761	10,182
Other assets	[4]	23,112	20,064
Deposits		(970,731)	(1,088,981)
Mandatorily redeemable capital stock		0	0
Accrued interest payable		(59,159)	(61,918)
Derivative liabilities	[4]	(114,867)	(88,770)
Level 2 [Member] \| Commitments to make additional advances [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other		(6,407)	(5,306)
Level 2 [Member] \| Standby Letters of Credit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other		(972)	(1,303)
Level 2 [Member] \| COs - Discount notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
CO Discount notes		(5,554,255)	(12,878,918)
Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks		0	0
Interest-bearing deposits		0	0
Securities purchased under agreements to resell		0	0
Federal funds sold		0	0
Trading securities	[4]	0	0
Available-for-sale securities Fair Value	[4]	73,842	122,549
Held-to-maturity fair value		0	0
Advances		0	0
Mortgage loans, net		32,115	49,247
Accrued interest receivable		0	0
Derivative assets	[4]	0	0
Other assets	[4]	0	0
Deposits		0	0
Mandatorily redeemable capital stock		0	0
Accrued interest payable		0	0
Derivative liabilities	[4]	0	0
Level 3 [Member] \| Commitments to make additional advances [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other		0	0
Level 3 [Member] \| Standby Letters of Credit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other		0	0
Level 3 [Member] \| COs - Discount notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
CO Discount notes		0	0
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks		205,284	2,050,028
Interest-bearing deposits		149	299,149
Securities purchased under agreements to resell		500,000	750,000
Federal funds sold		1,848,000	2,260,000
Trading securities	[4]	1,759,851	3,605,079
Available-for-sale securities Fair Value	[4]	12,132,257	6,220,148
Held-to-Maturity Securities Carrying Value		164,167	207,162
Advances		14,056,991	18,817,002
Mortgage loans, net		3,283,925	3,930,252
Accrued interest receivable		74,470	87,582
Derivative assets	[4]	356,261	161,238
Other assets	[4]	39,728	34,360
Deposits		(970,732)	(1,088,987)
Mandatorily redeemable capital stock		(13,890)	(6,282)
Accrued interest payable		(59,159)	(61,918)
Derivative liabilities	[4]	(21,401)	(24,062)
Carrying Value [Member] \| Commitments to make additional advances [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other		0	0
Carrying Value [Member] \| Standby Letters of Credit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other		(972)	(1,303)
Carrying Value [Member] \| COs - Discount notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
CO Discount notes		(5,554,103)	(12,878,310)
Total Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks		205,284	2,050,028
Interest-bearing deposits		149	299,149
Securities purchased under agreements to resell		500,000	749,995
Federal funds sold		1,848,000	2,259,988
Trading securities	[4]	1,759,851	3,605,079
Available-for-sale securities Fair Value	[4]	12,132,257	6,220,148
Held-to-maturity fair value		167,598	211,837
Advances		14,223,804	19,119,220
Mortgage loans, net		3,424,954	4,136,004
Accrued interest receivable		74,470	87,582
Derivative assets	[4]	356,261	161,238
Other assets	[4]	39,728	34,360
Deposits		(970,731)	(1,088,981)
Mandatorily redeemable capital stock		(13,890)	(6,282)
Accrued interest payable		(59,159)	(61,918)
Derivative liabilities	[4]	(21,401)	(24,062)
Total Fair Value [Member] \| Commitments to make additional advances [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other		(6,407)	(5,306)
Total Fair Value [Member] \| Standby Letters of Credit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other		(972)	(1,303)
Total Fair Value [Member] \| COs - Discount notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
CO Discount notes		(5,554,255)	(12,878,918)
COs - bonds [Member] \| Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
CO Bonds		0	0
COs - bonds [Member] \| Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
CO Bonds		(25,466,219)	(22,062,476)
COs - bonds [Member] \| Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
CO Bonds		0	0
COs - bonds [Member] \| Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
CO Bonds		(25,097,469)	(21,471,590)
COs - bonds [Member] \| Total Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
CO Bonds		$ (25,466,219)	$ (22,062,476)

[1]	Fair values of held-to-maturity securities were $167,598 and $211,837 at September 30, 2021, and December 31, 2020, respectively.
[2]	Amounts represent the effect of master-netting agreements intended to allow us to settle positive and negative positions with the same counterparty. Cash collateral including accrued interest posted was $440.0 million and $215.8 million at September 30, 2021, and December 31, 2020, respectively. The change in cash collateral posted is included in the net change in interest-bearing deposits in the statement of cash flows. There was no cash collateral and related accrued interest received at September 30, 2021, and December 31, 2020.
[3]	These amounts represent the effect of master-netting agreements intended to allow us to settle positive and negative positions and also cash collateral and related accrued interest held or placed with the same clearing member and/or counterparty.
[4]	Carried at fair value and measured on a recurring basis.

Fair Values Fair Value of Asset

Fair Values Fair Value of Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands		Sep. 30, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		$ 1,759,851	$ 3,605,079
Available-for-sale securities Fair Value		12,132,257	6,220,148
Derivative assets		356,261	161,238
Derivative Assets, Netting Adjustments and Cash Collateral	[1],[2]	346,500	151,056
Derivative liabilities		(21,401)	(24,062)
Derivative liability, Netting Adjustments and Cash Collateral	[1],[2]	93,466	64,708
COs - bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		296
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	[3]	0	0
Available-for-sale securities Fair Value	[3]	0	0
Derivative assets	[3]	0	0
Other assets	[3]	16,616	14,296
Mortgage loans held for portfolio		0	0
Derivative liabilities	[3]	0	0
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	[3]	1,759,851	3,605,079
Available-for-sale securities Fair Value	[3]	12,058,415	6,097,599
Derivative assets	[3]	9,761	10,182
Other assets	[3]	23,112	20,064
Mortgage loans held for portfolio		3,392,839	4,086,757
Derivative liabilities	[3]	(114,867)	(88,770)
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	[3]	0	0
Available-for-sale securities Fair Value	[3]	73,842	122,549
Derivative assets	[3]	0	0
Other assets	[3]	0	0
Mortgage loans held for portfolio		32,115	49,247
Derivative liabilities	[3]	0	0
Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets, Netting Adjustments and Cash Collateral	[4]	346,500	151,056
Derivative liability, Netting Adjustments and Cash Collateral	[4]	93,466	64,708
Recurring [Member] \| Interest-rate swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets, Netting Adjustments and Cash Collateral	[4]	346,500	151,056
Derivative liability, Netting Adjustments and Cash Collateral	[4]	93,466	64,708
Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0	0
Available-for-sale securities Fair Value		0	0
Derivative assets		0	0
Other assets		16,616	14,296
Total assets carried at fair value		16,616	14,296
Total liabilities carried at fair value		0	0
Recurring [Member] \| Level 1 [Member] \| Interest-rate swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0	0
Derivative liabilities		0	0
Recurring [Member] \| Level 1 [Member] \| COs - bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0
Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		1,759,851	3,605,079
Available-for-sale securities Fair Value		12,058,415	6,097,599
Derivative assets		9,761	10,182
Other assets		23,112	20,064
Total assets carried at fair value		13,851,139	9,732,924
Total liabilities carried at fair value		(114,867)	(88,770)
Recurring [Member] \| Level 2 [Member] \| Interest-rate swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		9,418	9,962
Derivative liabilities		(114,851)	(88,770)
Recurring [Member] \| Level 2 [Member] \| COs - bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		296
Recurring [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0	0
Available-for-sale securities Fair Value		73,842	122,549
Derivative assets		0	0
Other assets		0	0
Total assets carried at fair value		73,842	122,549
Total liabilities carried at fair value		0	0
Recurring [Member] \| Level 3 [Member] \| Interest-rate swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0	0
Derivative liabilities		0	0
Recurring [Member] \| Level 3 [Member] \| COs - bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0
Nonrecurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets carried at fair value	[5]	0	0
Mortgage loans held for portfolio	[5]	0	0
REO	[5]	0	0
Nonrecurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets carried at fair value	[5]	0	0
Mortgage loans held for portfolio	[5]	0	0
REO	[5]	0	0
Nonrecurring [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets carried at fair value	[5]	3,795	11,027
Mortgage loans held for portfolio	[5]	3,736	10,782
REO	[5]	59	245
Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	[3]	1,759,851	3,605,079
Available-for-sale securities Fair Value	[3]	12,132,257	6,220,148
Derivative assets	[3]	356,261	161,238
Other assets	[3]	39,728	34,360
Mortgage loans held for portfolio		3,424,954	4,136,004
Derivative liabilities	[3]	(21,401)	(24,062)
Estimate of Fair Value Measurement [Member] \| Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		1,759,851	3,605,079
Available-for-sale securities Fair Value		12,132,257	6,220,148
Derivative assets		356,261	161,238
Other assets		39,728	34,360
Total assets carried at fair value		14,288,097	10,020,825
Total liabilities carried at fair value		(21,401)	(24,062)
Estimate of Fair Value Measurement [Member] \| Recurring [Member] \| Interest-rate swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		355,918	161,018
Derivative liabilities		(21,385)	(24,062)
Estimate of Fair Value Measurement [Member] \| Recurring [Member] \| COs - bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		296
Estimate of Fair Value Measurement [Member] \| Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets carried at fair value	[5]	3,795	11,027
Mortgage loans held for portfolio	[5]	3,736	10,782
REO	[5]	59	245
Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		1,524	5,422
Corporate bonds [Member] \| Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0	0
Corporate bonds [Member] \| Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		1,524	5,422
Corporate bonds [Member] \| Recurring [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0	0
Corporate bonds [Member] \| Estimate of Fair Value Measurement [Member] \| Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		1,524	5,422
US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		1,756,149	3,596,718
Available-for-sale securities Fair Value		4,387,672
US Treasury Securities [Member] \| Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0	0
Available-for-sale securities Fair Value		0
US Treasury Securities [Member] \| Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		1,756,149	3,596,718
Available-for-sale securities Fair Value		4,387,672
US Treasury Securities [Member] \| Recurring [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0	0
Available-for-sale securities Fair Value		0
US Treasury Securities [Member] \| Estimate of Fair Value Measurement [Member] \| Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		1,756,149	3,596,718
Available-for-sale securities Fair Value		4,387,672
U.S. government guaranteed - single-family MBS [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		2,133	2,884
Available-for-sale securities Fair Value		23,025	29,408
U.S. government guaranteed - single-family MBS [Member] \| Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0	0
Available-for-sale securities Fair Value		0	0
U.S. government guaranteed - single-family MBS [Member] \| Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		2,133	2,884
Available-for-sale securities Fair Value		23,025	29,408
U.S. government guaranteed - single-family MBS [Member] \| Recurring [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0	0
Available-for-sale securities Fair Value		0	0
U.S. government guaranteed - single-family MBS [Member] \| Estimate of Fair Value Measurement [Member] \| Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		2,133	2,884
Available-for-sale securities Fair Value		23,025	29,408
U.S. government guaranteed-multifamily MBS [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities Fair Value		453,891	47,180
U.S. government guaranteed-multifamily MBS [Member] \| Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities Fair Value		0	0
U.S. government guaranteed-multifamily MBS [Member] \| Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities Fair Value		453,891	47,180
U.S. government guaranteed-multifamily MBS [Member] \| Recurring [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities Fair Value		0	0
U.S. government guaranteed-multifamily MBS [Member] \| Estimate of Fair Value Measurement [Member] \| Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities Fair Value		453,891	47,180
Mortgage Receivable [Member] \| Recurring [Member] \| Level 1 [Member] \| Mortgage-delivery commitments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0	0
Derivative liabilities		0
Mortgage Receivable [Member] \| Recurring [Member] \| Level 2 [Member] \| Mortgage-delivery commitments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		47	220
Derivative liabilities		(16)
Mortgage Receivable [Member] \| Recurring [Member] \| Level 3 [Member] \| Mortgage-delivery commitments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0	0
Derivative liabilities		0
Mortgage Receivable [Member] \| Estimate of Fair Value Measurement [Member] \| Recurring [Member] \| Mortgage-delivery commitments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		47	220
Derivative liabilities		(16)
HFA securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities Fair Value		73,842	122,549
HFA securities [Member] \| Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities Fair Value		0	0
HFA securities [Member] \| Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities Fair Value		0	0
HFA securities [Member] \| Recurring [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities Fair Value		73,842	122,549
HFA securities [Member] \| Estimate of Fair Value Measurement [Member] \| Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities Fair Value		73,842	122,549
Supranational institutions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities Fair Value		411,601	430,069
Supranational institutions [Member] \| Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities Fair Value		0	0
Supranational institutions [Member] \| Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities Fair Value		411,601	430,069
Supranational institutions [Member] \| Recurring [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities Fair Value		0	0
Supranational institutions [Member] \| Estimate of Fair Value Measurement [Member] \| Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities Fair Value		411,601	430,069
U.S. government-owned corporations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities Fair Value		304,506	322,061
U.S. government-owned corporations [Member] \| Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities Fair Value		0	0
U.S. government-owned corporations [Member] \| Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities Fair Value		304,506	322,061
U.S. government-owned corporations [Member] \| Recurring [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities Fair Value		0	0
U.S. government-owned corporations [Member] \| Estimate of Fair Value Measurement [Member] \| Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities Fair Value		304,506	322,061
GSE [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities Fair Value		126,308	134,992
GSE [Member] \| Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities Fair Value		0	0
GSE [Member] \| Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities Fair Value		126,308	134,992
GSE [Member] \| Recurring [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities Fair Value		0	0
GSE [Member] \| Estimate of Fair Value Measurement [Member] \| Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities Fair Value		126,308	134,992
Single Family [Member] \| Government Sponsored Enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		45	55
Available-for-sale securities Fair Value		1,223,504	1,469,048
Single Family [Member] \| Government Sponsored Enterprises [Member] \| Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0	0
Available-for-sale securities Fair Value		0	0
Single Family [Member] \| Government Sponsored Enterprises [Member] \| Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		45	55
Available-for-sale securities Fair Value		1,223,504	1,469,048
Single Family [Member] \| Government Sponsored Enterprises [Member] \| Recurring [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0	0
Available-for-sale securities Fair Value		0	0
Single Family [Member] \| Government Sponsored Enterprises [Member] \| Estimate of Fair Value Measurement [Member] \| Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		45	55
Available-for-sale securities Fair Value		1,223,504	1,469,048
Multifamily [Member] \| Government Sponsored Enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities Fair Value		5,127,908	3,664,841
Multifamily [Member] \| Government Sponsored Enterprises [Member] \| Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities Fair Value		0	0
Multifamily [Member] \| Government Sponsored Enterprises [Member] \| Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities Fair Value		5,127,908	3,664,841
Multifamily [Member] \| Government Sponsored Enterprises [Member] \| Recurring [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities Fair Value		0	0
Multifamily [Member] \| Government Sponsored Enterprises [Member] \| Estimate of Fair Value Measurement [Member] \| Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities Fair Value		$ 5,127,908	$ 3,664,841

[1]	Amounts represent the effect of master-netting agreements intended to allow us to settle positive and negative positions with the same counterparty. Cash collateral including accrued interest posted was $440.0 million and $215.8 million at September 30, 2021, and December 31, 2020, respectively. The change in cash collateral posted is included in the net change in interest-bearing deposits in the statement of cash flows. There was no cash collateral and related accrued interest received at September 30, 2021, and December 31, 2020.
[2]	These amounts represent the effect of master-netting agreements intended to allow us to settle positive and negative positions and also cash collateral and related accrued interest held or placed with the same clearing member and/or counterparty.
[3]	Carried at fair value and measured on a recurring basis.
[4]	These amounts represent the effect of master-netting agreements intended to allow us to settle positive and negative positions and also cash collateral and related accrued interest held or placed with the same clearing member and/or counterparty.
[5]	We measure certain held-to-maturity investment securities, mortgage loans held for portfolio, and REO at fair value on a nonrecurring basis, that is, they are not measured at fair value on an ongoing basis but are subject to fair-value adjustments only in certain circumstances. The fair values presented are as of the date the fair value adjustment was recorded.

Estimated Fair Value Level 3 Re

Estimated Fair Value Level 3 Reconciliation - Roll Forward (Details) - Level 3 [Member] - Recurring [Member] - Available-for-sale Securities [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
HFA securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 86,077	$ 59,463	$ 122,549	$ 64,652
Transfer of securities from held-to-maturity to available-for-sale	0	71,240	0	71,240
Total net unrealized gains included in other comprehensive income	125	3,040	3,458	5,451
Maturities	(12,360)	(7,995)	(50,720)	(15,595)
Settlements	0	0	(1,445)	0
Balance at end of period	73,842	125,748	73,842	125,748
Total amount of unrealized gains for the period included in other comprehensive income relating to securities held at period end	$ 125	2,384	$ 342	4,758
Mortgage-backed Securities, Issued by Private Enterprises [Member] \| Residential Mortgage Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period		0		0
Transfer of securities from held-to-maturity to available-for-sale		180,514		180,514
Net gains on sale		26,210		26,210
Reduction of provision for credit losses		211		211
Accretion		272		272
Total net unrealized gains included in other comprehensive income		(17,098)		(17,098)
Sales		(165,439)		(165,439)
Maturities		0		0
Settlements		(1,892)		(1,892)
Balance at end of period		22,778		22,778
Total amount of unrealized gains for the period included in other comprehensive income relating to securities held at period end		617		617
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings		$ 415		$ 415

Off-Balance Sheet Commitments (

Off-Balance Sheet Commitments (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2021	Dec. 31, 2020
Loss Contingencies [Line Items]
Value of the guarantees related to standby letters of credit		$ 63,005	$ 69,293
Maximum term of commitments to invest in mortgage loans		60 days
Other FHLBanks [Member]
Loss Contingencies [Line Items]
Par value of other FHLBanks' outstanding COs for which we are jointly and severally liable		$ 610,800,000	712,500,000
Maximum [Member]
Loss Contingencies [Line Items]
Standby letters of credit, original terms		20 years
Standby letters of credit, current terms		10 years
Standby letters of credit [Member]
Loss Contingencies [Line Items]
Off-balance-sheet Commitments Expiring Within One Year	[1],[2]	$ 5,112,384	6,190,479
Off-balance-sheet Commitments Expiring After One Year	[1],[2]	200,788	233,771
Total Off-balance Sheet Commitments	[1],[2]	5,313,172	6,424,250
Value of the guarantees related to standby letters of credit		972	1,300
Commitments of unused lines of credit - advances [Member]
Loss Contingencies [Line Items]
Off-balance-sheet Commitments Expiring Within One Year	[2],[3]	1,120,311	1,127,432
Off-balance-sheet Commitments Expiring After One Year	[2],[3]	0	0
Total Off-balance Sheet Commitments	[2],[3]	$ 1,120,311	1,127,432
Commitments of unused lines of credit - advances [Member] \| Maximum [Member]
Loss Contingencies [Line Items]
Period for commitments for unused line-of-credit advances		12 months
Commitments to make additional advances [Member]
Loss Contingencies [Line Items]
Off-balance-sheet Commitments Expiring Within One Year	[2]	$ 50,940	69,684
Off-balance-sheet Commitments Expiring After One Year	[2]	72,646	93,465
Total Off-balance Sheet Commitments	[2]	123,586	163,149
Unsettled CO bonds, at par [Member]
Loss Contingencies [Line Items]
Off-balance-sheet Commitments Expiring Within One Year	[2]	597,000	0
Off-balance-sheet Commitments Expiring After One Year	[2]	0	0
Total Off-balance Sheet Commitments	[2]	597,000	0
Unsettled CO discount notes, at par [Member]
Loss Contingencies [Line Items]
Off-balance-sheet Commitments Expiring Within One Year	[2]	0	250,000
Off-balance-sheet Commitments Expiring After One Year	[2]	0	0
Total Off-balance Sheet Commitments	[2]	0	250,000
Standby Letters of Credit Issuance Commitments [Member]
Loss Contingencies [Line Items]
Off-balance-sheet Commitments Expiring Within One Year		81,500	37,100
Off-balance-sheet Commitments Expiring After One Year			25
Mortgage Receivable [Member] \| Commitments to invest in mortgage loans [Member]
Loss Contingencies [Line Items]
Off-balance-sheet Commitments Expiring Within One Year	[2]	8,019	28,386
Off-balance-sheet Commitments Expiring After One Year	[2]	0	0
Total Off-balance Sheet Commitments	[2]	$ 8,019	$ 28,386

[1]	The amount of standby letters of credit outstanding excludes commitments to issue standby letters of credit that expire within one year. At September 30, 2021, and December 31, 2020, these amounts totaled $81.5 million and $37.1 million, respectively. Also excluded are commitments to issue standby letters of credit that expire after one year totaling $25 thousand at December 31, 2020.
[2]	We have determined that it is unnecessary to record any liability for credit losses on these agreements.
[3]	Commitments for unused line-of-credit advances are generally for periods of up to 12 months. Since many of these commitments are not expected to be drawn upon, the total commitment amount does not necessarily indicate future liquidity requirements.

Transactions with Shareholder_2

Transactions with Shareholders (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Transactions with Shareholders [Line Items]
Shareholders with more than 10 percent of total capital stock outstanding	$ 0	$ 0
Capital Stock Outstanding	1,028,177	1,267,172
Par Value of Advances	14,015,575	18,704,512
Total Accrued Interest Receivable	74,470	87,582
Directors' Financial Institutions [Member]
Transactions with Shareholders [Line Items]
Capital Stock Outstanding	$ 50,334	$ 60,624
Percent of Total Capital Stock	4.80%	4.80%
Par Value of Advances	$ 480,328	$ 582,765
Percentage of Total Par Value of Advances	3.40%	3.10%
Total Accrued Interest Receivable	$ 493	$ 651
Percent of Total Accrued Interest Receivable on Advances	2.30%	2.50%
Minimum [Member]
Transactions with Shareholders [Line Items]
Definition of shareholder concentration, minimum percent	10.00%

Subsequent Events (Details)

Subsequent Events (Details) - Common Class B [Member] - Subsequent Event [Member] - USD ($) $ in Millions	Nov. 02, 2021	Oct. 22, 2021
Subsequent Event [Line Items]
Annualized rate of cash dividend		2.05%
Dividend, including dividends on mandatorily redeemable capital stock	$ 5.5