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Derivatives and Hedging Activities Derivatives in Statement of Condition (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount $ 15,097,316 $ 13,241,272
Derivative Assets, before netting and collateral adjustments 15,329 13,832
Derivative Liabilities, before netting and collateral adjustments (43,805) (309,552)
Derivative Asset, netting adjustments and cash collateral including related accrued interest [1],[2] 144,402 8,571
Derivative Liability, netting adjustments and cash collateral including related accrued interest [1],[2] 33,534 53,752
Derivative assets 159,731 22,403
Derivative liabilities (10,271) (255,800)
Cash collateral and related accrued interest posted 178,500 62,800
Cash collateral and related accrued interest received 561 471
Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 12,145,105 12,262,699
Derivative Assets, before netting and collateral adjustments 14,753 12,811
Derivative Liabilities, before netting and collateral adjustments (12,805) (297,077)
Designated as Hedging Instrument [Member] | Interest-rate swaps [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 12,128,105 11,980,699
Derivative Assets, before netting and collateral adjustments 14,734 12,811
Derivative Liabilities, before netting and collateral adjustments (12,805) (296,324)
Designated as Hedging Instrument [Member] | Forward-start interest-rate swaps [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 17,000 282,000
Derivative Assets, before netting and collateral adjustments 19 0
Derivative Liabilities, before netting and collateral adjustments 0 (753)
Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 2,952,211 978,573
Derivative Assets, before netting and collateral adjustments 576 1,021
Derivative Liabilities, before netting and collateral adjustments (31,000) (12,475)
Not Designated as Hedging Instrument [Member] | Interest-rate swaps [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 2,902,300 927,800
Derivative Assets, before netting and collateral adjustments 349 682
Derivative Liabilities, before netting and collateral adjustments (31,000) (12,475)
Mortgage Receivable [Member] | Not Designated as Hedging Instrument [Member] | Mortgage-delivery commitments [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount [3] 49,911 50,773
Derivative Assets, before netting and collateral adjustments [3] 227 339
Derivative Liabilities, before netting and collateral adjustments [3] $ 0 $ 0
[1]
Amounts represent the effect of master-netting agreements intended to allow us to settle positive and negative positions with the same counterparty. Cash collateral and related accrued interest posted was $178.5 million and $62.8 million at December 31, 2019, and 2018, respectively. The change in cash collateral posted is included in the net change in interest-bearing deposits in the statement of cash flows. Cash collateral and related accrued interest received was $561 thousand and $471 thousand at December 31, 2019 and 2018.

[2]
These amounts represent the effect of master-netting agreements intended to allow us to settle positive and negative positions and also cash collateral and related accrued interest held or placed with the same clearing member and/or counterparty.
[3]
Mortgage-delivery commitments are classified as derivatives with changes in fair value recorded in other income.