v3.26.1
Derivatives and Hedging Activities (Derivatives in Statement of Condition) (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount $ 109,393,351 $ 125,211,855
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement 510,558 348,885
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement 491,498 621,895
Derivative Asset, Fair Value, Amount Offset Against Collateral (203,007) (9,797)
Derivative Liability, Fair Value, Amount Offset Against Collateral (207,557) (316,400)
Derivative Asset Fair Value Cash Received or Remitted Exceeding Variation Margin Requirement (31) (48)
Derivative Liability, Fair Value Cash Received or Remitted Exceeding Variation Margin Requirement 0 2
Derivative Asset, Fair Value, Gross Liability (273,825) (301,142)
Derivative Liability, Fair Value, Gross Asset (273,825) (301,142)
Derivative Asset, Subject to Master Netting Arrangement, Gross Liability and Collateral, Obligation to Return Cash, Offset [1] (476,863) (310,987)
Derivative Liability, Subject to Master Netting Arrangement, Gross Asset and Collateral, Right to Reclaim Cash, Offset [1] (481,382) (617,540)
Derivative assets 33,695 37,898
Derivative liabilities 10,116 4,355
Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 72,622,796 80,077,048
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement 431,637 264,349
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement 489,446 619,486
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Advances [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount [2] 23,223,399 28,564,835
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement [2] 44,577 34,801
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement [2] 3,988 31,802
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Categories of Investments, Marketable Securities, Available-for-sale Securities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount [2] 17,905,627 19,288,313
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement [2] 292,968 153,747
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement [2] 25,642 88,347
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Consolidated Obligation Bonds [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount [2] 30,802,770 31,257,900
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement [2] 93,563 75,150
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement [2] 459,816 499,337
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Consolidated Obligation Discount Notes [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount [3] 691,000 966,000
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement [3] 529 651
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement [3] 0 0
Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 36,770,555 45,134,807
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement 78,921 84,536
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement 2,052 2,409
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Advances [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 0 850,000
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement 0 2
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement 0 0
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Categories of Investments, Marketable Securities, Available-for-sale Securities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 3,922 653,337
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement 7 1
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement 1 33
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Mortgages [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 863,465 713,465
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement 3,854 3,387
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement 288 92
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Consolidated Obligation Bonds [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 106,445 106,445
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement 479 519
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement 31 35
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Consolidated Obligation Discount Notes [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 19,932,000 28,021,000
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement 51 65
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement 343 515
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Counterparty exposure [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 10,000,000 10,000,000
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement 74,093 79,726
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement 1,308 1,568
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Intermediary Transactions [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 6,186 18,558
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement 14 60
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement 11 56
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Other Contract [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 150,000 400,000
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement 0 0
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement 60 109
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member] | Mortgage Receivable [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 17,087 25,952
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement 40 0
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement 0 1
Not Designated as Hedging Instrument [Member] | Interest Rate Swaption [Member] | Categories of Investments, Marketable Securities, Available-for-sale Securities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 500,000 1,150,000
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement 80 307
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement 0 0
Not Designated as Hedging Instrument, Trading [Member] | Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 5,191,450 3,196,050
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement 303 469
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement $ 10 $ 0
[1] Amounts represent the impact of legally enforceable master netting agreements or other legally enforceable arrangements between the Bank and its derivative counterparties that allow the Bank to offset positive and negative positions as well as any cash collateral held or placed with those same counterparties.
[2] Derivatives designated as fair value hedges.
[3] Derivatives designated as cash flow hedges.