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 $ 76,445,770 $ 62,170,862
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement 108,837 79,103
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement 79,840 126,831
Derivative Asset, Subject to Master Netting Arrangement, Gross Liability and Collateral, Obligation to Return Cash, Offset [1],[2] 235,783 271,014
Derivative Liability, Subject to Master Netting Arrangement, Gross Asset and Collateral, Right to Reclaim Cash, Offset [2] (72,808) (124,837) [1]
Derivative assets 344,620 350,117
Derivative liabilities 7,032 1,994
Cash Collateral posted 350,100 411,300
Cash Collateral received 41,500 15,500
Advances [Member]    
Derivatives, Fair Value [Line Items]    
Hedged Asset, Fair Value Hedge [3] 12,763,415 12,068,299
Hedged Asset, Active Fair Value Hedge, Cumulative Increase (Decrease) (109,168) (23,668)
Short-term Debt [Member]    
Derivatives, Fair Value [Line Items]    
Hedged Liability, Fair Value Hedge 27,734,871 14,814,633
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 68,883,003 53,556,210
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement 89,232 53,257
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement 67,422 118,379
Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 7,562,767 8,614,652
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement 19,605 25,846
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement 12,418 8,452
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 5,115,097 5,981,376
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement 17,227 24,689
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement 11,468 7,854
Not Designated as Hedging Instrument [Member] | Interest Rate Caps or Floors [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 2,400,000 2,600,000
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement 2,371 1,151
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement 0 0
Mortgage Receivable [Member] | Not Designated as Hedging Instrument [Member] | Forward Contracts [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 47,670 33,276
Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement 7 6
Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement $ 950 $ 598
[1] Amounts represent the application of the netting requirements that allow the Bank to settle positive and negative positions and also cash collateral and related accrued interest held or placed by the Bank with the same clearing agent and/or counterparties.
[2] Amounts represent the application of the netting requirements that allow the Bank to settle positive and negative positions and also cash collateral and related accrued interest held or placed by the Bank with the same clearing agent and/or counterparties. Cash collateral posted including accrued interest was $350.1 million for June 30, 2026 and $411.3 million for December 31, 2025. Cash collateral received was $41.5 million for June 30, 2026 and $15.5 million for December 31, 2025
[3] Includes only the portion of amortized cost representing the hedged items in active or discontinued fair value hedging relationships. Amortized cost includes fair value hedging adjustments.