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Basis Adjustments for Fair Value Hedges (Details)
$ in Thousands
Mar. 31, 2020
USD ($)
Advances [Member]  
Derivatives, Fair Value [Line Items]  
Amortized Cost of Hedged Asset/(Liability) $ 6,241,203 [1]
Basis Adjustments for Active Hedging Relationships Included in Amortized Cost 187,480
Basis Adjustments for Discontinued Hedging Relationships Included in Amortized Cost 10,505
Cumulative Amount of Fair Value Hedging Basis Adjustments 197,985
Available-for-sale Securities [Member]  
Derivatives, Fair Value [Line Items]  
Amortized Cost of Hedged Asset/(Liability) 4,419,656 [1]
Basis Adjustments for Active Hedging Relationships Included in Amortized Cost 595,088
Basis Adjustments for Discontinued Hedging Relationships Included in Amortized Cost 0
Cumulative Amount of Fair Value Hedging Basis Adjustments 595,088
COs - bonds [Member]  
Derivatives, Fair Value [Line Items]  
Amortized Cost of Hedged Asset/(Liability) 3,130,935 [1]
Basis Adjustments for Active Hedging Relationships Included in Amortized Cost 59,218
Basis Adjustments for Discontinued Hedging Relationships Included in Amortized Cost 41,687
Cumulative Amount of Fair Value Hedging Basis Adjustments $ 100,905
[1]
Includes only the portion of amortized cost representing the hedged items in fair-value hedging relationships.