v3.26.1
Derivatives and Hedging Activities (Derivatives in Statement of Condition) (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount $ 109,873,376 $ 125,211,855
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement 402,346 348,885
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement 580,203 621,895
Derivative Asset, Fair Value, Amount Offset Against Collateral (77,657) (9,797)
Derivative Liability, Fair Value, Amount Offset Against Collateral (230,739) (316,400)
Derivative Asset Fair Value Cash Received or Remitted Exceeding Variation Margin Requirement 0 (48)
Derivative Liability, Fair Value Cash Received or Remitted Exceeding Variation Margin Requirement 24 2
Derivative Asset, Fair Value, Gross Liability (316,775) (301,142)
Derivative Liability, Fair Value, Gross Asset (316,775) (301,142)
Derivative Asset, Subject to Master Netting Arrangement, Gross Liability and Collateral, Obligation to Return Cash, Offset [1] (394,432) (310,987)
Derivative Liability, Subject to Master Netting Arrangement, Gross Asset and Collateral, Right to Reclaim Cash, Offset [1] (547,490) (617,540)
Derivative assets 7,914 37,898
Derivative liabilities 32,713 4,355
Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 76,172,770 80,077,048
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement 292,907 264,349
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement 579,184 619,486
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Advances [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount [2] 23,812,750 28,564,835
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement [2] 30,653 34,801
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement [2] 29,056 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] 18,991,520 19,288,313
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement [2] 181,682 153,747
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement [2] 65,264 88,347
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Consolidated Obligation Bonds [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount [2] 32,602,500 31,257,900
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement [2] 80,561 75,150
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement [2] 484,468 499,337
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Consolidated Obligation Discount Notes [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount [3] 766,000 966,000
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement [3] 11 651
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement [3] 396 0
Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 33,700,606 45,134,807
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement 109,439 84,536
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement 1,019 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 49,382 653,337
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement 3 1
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement 10 33
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Mortgages [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 713,465 713,465
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement 2,464 3,387
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement 513 92
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Consolidated Obligation Bonds [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 116,445 106,445
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement 83 519
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement 0 35
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Consolidated Obligation Discount Notes [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 16,751,000 28,021,000
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement 89 65
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement 19 515
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 106,385 79,726
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement 0 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 35 60
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement 32 56
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Other Contract [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 200,000 400,000
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement 43 0
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement 8 109
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member] | Mortgage Receivable [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 18,078 25,952
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement 0 0
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement 126 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 1,150,000 1,150,000
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement 335 307
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 4,696,050 3,196,050
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement 2 469
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement $ 311 $ 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.