v3.26.3
Derivatives and Hedging Activities - Schedule of Carrying Amount of FHLBNY’s Assets and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Derivative [Line Items]    
Carrying amount of hedged assets $ 75,529,960 $ 66,113,322
Cumulative Fair Value Hedging Adjustment Included in the Carrying Amount of Hedged Items Gains (Losses) - Assets - Active Hedging Relationship (1,608,158) (512,601)
Cumulative Fair Value Hedging Adjustment Included in the Carrying Amount of Hedged Items Gains (Losses) - Assets - Discontinued Hedging Relationship (445) (543)
Carrying amount of hedged liabilities 74,994,178 100,640,099
Cumulative Fair Value Hedging Adjustment Included in the Carrying Amount of Hedged Items Gains (Losses) - Liabilities - Active Hedging Relationship 344,560 58,815
Cumulative Fair Value Hedging Adjustment Included in the Carrying Amount of Hedged Items Gains (Losses) - Liabilities - Discontinued Hedging Relationship (85,948) (92,503)
Hedged Consolidated obligation bonds    
Derivative [Line Items]    
Carrying amount of hedged liabilities 21,797,700 30,187,853
Cumulative Fair Value Hedging Adjustment Included in the Carrying Amount of Hedged Items Gains (Losses) - Liabilities - Active Hedging Relationship 310,447 51,438
Cumulative Fair Value Hedging Adjustment Included in the Carrying Amount of Hedged Items Gains (Losses) - Liabilities - Discontinued Hedging Relationship (86,533) (92,610)
De-designated hedged liabilities, par value 1,700,000 1,400,000
Hedged Consolidated obligation discount notes    
Derivative [Line Items]    
Carrying amount of hedged liabilities 53,196,478 70,452,246
Cumulative Fair Value Hedging Adjustment Included in the Carrying Amount of Hedged Items Gains (Losses) - Liabilities - Active Hedging Relationship 34,113 7,377
Cumulative Fair Value Hedging Adjustment Included in the Carrying Amount of Hedged Items Gains (Losses) - Liabilities - Discontinued Hedging Relationship 585 107
De-designated hedged liabilities, par value 4,400,000 1,600,000
Advances    
Derivative [Line Items]    
Carrying amount of hedged assets 67,010,611 58,543,501
Cumulative Fair Value Hedging Adjustment Included in the Carrying Amount of Hedged Items Gains (Losses) - Assets - Active Hedging Relationship (787,834) (149,229)
De-designated hedged assets, par value   500,000
Available-for-Sale Securities    
Derivative [Line Items]    
Carrying amount of hedged assets 8,519,349 7,569,821
Cumulative Fair Value Hedging Adjustment Included in the Carrying Amount of Hedged Items Gains (Losses) - Assets - Active Hedging Relationship (820,324) (363,372)
Cumulative Fair Value Hedging Adjustment Included in the Carrying Amount of Hedged Items Gains (Losses) - Assets - Discontinued Hedging Relationship (445) (543)
De-designated hedged assets, par value $ 10,000 $ 10,000