v3.26.1
Derivatives and Hedging Activities (Offsetting Liabilities) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Offsetting Liabilities [Line Items]          
Derivative Liability, Fair Value, Gross Liability $ 78,890   $ 78,890   $ 126,233
Derivative Liability, Subject to Master Netting Arrangement, Gross Asset and Collateral, Right to Reclaim Cash, Offset [1] (72,808)   (72,808)   (124,837) [2]
Derivative Laibility, Net Fair Value Amount, After Offsetting Adjustment 6,082   6,082   1,396
Derivative Liability, Not Subject to Master Netting Arrangement 950   950   598 [3]
Derivative liabilities 7,032   7,032   1,994
Net gains (losses) related to derivatives not designated as hedging instruments 858 $ (7,750) (6,543) $ (19,617)  
Other Contract [Member]          
Offsetting Liabilities [Line Items]          
Net gains (losses) related to derivatives not designated as hedging instruments 0 $ 1 0 $ 0  
Consolidated Obligations Bonds [Member]          
Offsetting Liabilities [Line Items]          
Hedged Liability, Fair Value Hedge [4] 16,538,594   16,538,594    
Over the Counter [Member]          
Offsetting Liabilities [Line Items]          
Derivative Liability, Fair Value, Gross Liability 76,904   76,904   125,345
Derivative Liability, Subject to Master Netting Arrangement, Gross Asset and Collateral, Right to Reclaim Cash, Offset (70,822)   (70,822)   (123,949)
Derivative Laibility, Net Fair Value Amount, After Offsetting Adjustment 6,082   6,082   1,396
Derivative Liability, Not Subject to Master Netting Arrangement 950   950   598 [3]
Derivative liabilities 7,032   7,032   1,994
Exchange Cleared [Member]          
Offsetting Liabilities [Line Items]          
Derivative Liability, Fair Value, Gross Liability 1,986   1,986   888
Derivative Liability, Subject to Master Netting Arrangement, Gross Asset and Collateral, Right to Reclaim Cash, Offset (1,986)   (1,986)   (888)
Derivative Laibility, Net Fair Value Amount, After Offsetting Adjustment 0   0   0
Derivative Liability, Not Subject to Master Netting Arrangement 0   0   0 [3]
Derivative liabilities $ 0   $ 0   $ 0
[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. 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
[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.
[3] Represents derivatives that are not subject to an enforceable netting agreement (e.g., mortgage delivery commitments).
[4] 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.