v3.26.1
Derivatives and Hedging Activities - Schedule of Carrying Amount of FHLBNY’s Assets and Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Derivative [Line Items]    
Carrying amount of hedged assets $ 66,572,106 $ 66,113,322
Cumulative Fair Value Hedging Adjustment Included in the Carrying Amount of Hedged Items Gains (Losses) - Assets - Active Hedging Relationship (843,430) (512,601)
Cumulative Fair Value Hedging Adjustment Included in the Carrying Amount of Hedged Items Gains (Losses) - Assets - Discontinued Hedging Relationship (478) (543)
Carrying amount of hedged liabilities 82,498,384 100,640,099
Cumulative Fair Value Hedging Adjustment Included in the Carrying Amount of Hedged Items Gains (Losses) - Liabilities - Active Hedging Relationship 149,443 58,815
Cumulative Fair Value Hedging Adjustment Included in the Carrying Amount of Hedged Items Gains (Losses) - Liabilities - Discontinued Hedging Relationship (88,395) (92,503)
Hedged consolidated obligation bonds    
Derivative [Line Items]    
Carrying amount of hedged liabilities 25,567,798 30,187,853
Cumulative Fair Value Hedging Adjustment Included in the Carrying Amount of Hedged Items Gains (Losses) - Liabilities - Active Hedging Relationship 112,364 51,438
Cumulative Fair Value Hedging Adjustment Included in the Carrying Amount of Hedged Items Gains (Losses) - Liabilities - Discontinued Hedging Relationship (88,495) (92,610)
De-designated hedged liabilities, par value 1,600,000 1,400,000
Hedged consolidated obligation discount notes    
Derivative [Line Items]    
Carrying amount of hedged liabilities 56,930,586 70,452,246
Cumulative Fair Value Hedging Adjustment Included in the Carrying Amount of Hedged Items Gains (Losses) - Liabilities - Active Hedging Relationship 37,079 7,377
Cumulative Fair Value Hedging Adjustment Included in the Carrying Amount of Hedged Items Gains (Losses) - Liabilities - Discontinued Hedging Relationship 100 107
De-designated hedged liabilities, par value 1,500,000 1,600,000
Advances    
Derivative [Line Items]    
Carrying amount of hedged assets 58,555,969 58,543,501
Cumulative Fair Value Hedging Adjustment Included in the Carrying Amount of Hedged Items Gains (Losses) - Assets - Active Hedging Relationship (386,447) (149,229)
Cumulative Fair Value Hedging Adjustment Included in the Carrying Amount of Hedged Items Gains (Losses) - Assets - Discontinued Hedging Relationship 0  
De-designated hedged assets, par value 300,000 500,000
Available-for-Sale Securities    
Derivative [Line Items]    
Carrying amount of hedged assets 8,016,137 7,569,821
Cumulative Fair Value Hedging Adjustment Included in the Carrying Amount of Hedged Items Gains (Losses) - Assets - Active Hedging Relationship (456,983) (363,372)
Cumulative Fair Value Hedging Adjustment Included in the Carrying Amount of Hedged Items Gains (Losses) - Assets - Discontinued Hedging Relationship (478) (543)
De-designated hedged assets, par value $ 10,000 $ 10,000