v3.26.1
Derivatives and Hedging Activities - Derivatives in Statement of Income and Impact on Interest) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Derivative Instruments, Gain (Loss) [Line Items]        
Advances [1] $ 419,456 $ 482,767 $ 816,385 $ 929,379
Available-for-sale securities [1] 167,972 183,250 333,512 365,012
Consolidated obligation discount notes (260,055) [1] (263,623) (502,706) [1] (493,021)
Consolidated obligation bonds [1] (491,702) (581,667) (987,180) (1,151,535)
Interest-rate related | Advances        
Derivative Instruments, Gain (Loss) [Line Items]        
Net interest settlements on derivatives [2] 18,263 68,336 39,902 141,480
Net gains (losses) on derivatives² [3] 127,681 (114,677) 214,211 (289,230)
Net gains (losses) on hedged items³ [4] (126,856) 113,618 (213,347) 286,262
Price alignment interest (1,474) (661) (1,491) (3,198)
Net impact on net interest income 17,614 66,616 39,275 135,314
Interest-rate related | AFS Securities        
Derivative Instruments, Gain (Loss) [Line Items]        
Net interest settlements on derivatives [2] 44,589 84,330 94,775 169,425
Net gains (losses) on derivatives² [3] 78,410 (47,793) 102,257 (137,598)
Net gains (losses) on hedged items³ [4] (90,047) 34,202 (126,783) 110,698
Price alignment interest (1,904) (3,964) (3,486) (9,123)
Net impact on net interest income 31,048 66,775 66,763 133,402
Interest-rate related | Discount Notes        
Derivative Instruments, Gain (Loss) [Line Items]        
Net interest settlements on derivatives [2] 417   896  
Net gains (losses) on derivatives² [3] (246)   (1,251)  
Net gains (losses) on hedged items³ [4] 251   1,315  
Price alignment interest (263)   (533)  
Net impact on net interest income 159   427  
Interest-rate related | CO Bonds        
Derivative Instruments, Gain (Loss) [Line Items]        
Net interest settlements on derivatives [2] (45,208) (95,423) (98,393) (205,226)
Net gains (losses) on derivatives² [3] (12,215) 122,007 (16,914) 326,174
Net gains (losses) on hedged items³ [4] 12,305 (122,439) 12,892 (325,522)
Price alignment interest (2) (263) (37) (553)
Net impact on net interest income $ (45,120) $ (96,118) $ (102,452) $ (205,127)
[1] For advances, AFS securities, discount notes, and CO bonds only, as applicable.
[2] Represents interest income/expense on derivatives in active qualifying fair-value hedging relationships. Net interest settlements on derivatives that are not in qualifying fair-value hedging relationships are reported in other income.
[3] Includes increases (decreases) in estimated fair value and swap fees received (paid) resulting from terminations of derivatives.
[4]     Includes increases (decreases) in estimated fair value and amortization of net gains and losses on ineffective and discontinued fair-value hedging relationships.