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Fair Value Measures and Disclosures (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Advances [Member]    
Derivative [Line Items]    
Hedged Asset, Fair Value Hedge [1] $ 12,964,844 $ 16,724,094
Hedged Asset, Active Fair Value Hedge, Cumulative Increase (Decrease) 361,223 172,779
Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) (25) (9)
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) 361,198 172,770
Available-for-sale Securities    
Derivative [Line Items]    
Hedged Asset, Fair Value Hedge [1] 1,509,667 1,391,938
Hedged Asset, Active Fair Value Hedge, Cumulative Increase (Decrease) 149,180 48,946
Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) 1,182 1,281
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) 150,362 50,227
Consolidated Obligations Bonds [Member]    
Derivative [Line Items]    
Hedged Liability, Fair Value Hedge [1] 5,060,725 16,715,492
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) 37,015 32,886
Hedged Liability, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) 318 160
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) $ 37,333 $ 33,046
[1] Includes carrying value of hedged items in current fair value hedging relationships.