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Derivatives and Hedging Activities Basis Adjustments for Fair Value Hedges (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Advances [Member]  
Derivatives, Fair Value [Line Items]  
Amortized Cost of Hedged Asset/(Liability) $ 5,115,016 [1]
Basis Adjustments for Active Hedging Relationships Included in Amortized Cost 38,988
Basis Adjustments for Discontinued Hedging Relationships Included in Amortized Cost 10,835
Cumulative Amount of Fair Value Hedging Basis Adjustments 49,823
Available-for-sale Securities [Member]  
Derivatives, Fair Value [Line Items]  
Amortized Cost of Hedged Asset/(Liability) 4,053,138 [1]
Basis Adjustments for Active Hedging Relationships Included in Amortized Cost 226,346
Basis Adjustments for Discontinued Hedging Relationships Included in Amortized Cost 0
Cumulative Amount of Fair Value Hedging Basis Adjustments 226,346
COs - bonds [Member]  
Derivatives, Fair Value [Line Items]  
Amortized Cost of Hedged Asset/(Liability) 3,359,616 [1]
Basis Adjustments for Active Hedging Relationships Included in Amortized Cost (4,840)
Basis Adjustments for Discontinued Hedging Relationships Included in Amortized Cost 36,906
Cumulative Amount of Fair Value Hedging Basis Adjustments $ 32,066
[1]
Includes only the portion of amortized cost representing the hedged items in fair-value hedging relationships.