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Derivative Instruments - Fair value and notional amount of derivatives (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Derivative offsetting |  |  |
Derivative assets subject to master netting agreements |  | $ 123,000 | $ 122,300
Derivative liabilities subject to master netting agreements |  | 72,600 | 53,900
Not designated as hedging instrument |  |  |
Derivative [Line Items] |  |  |
Asset derivatives - fair value |  | 127,153 | 127,121
Liability derivatives - fair value |  | (72,655) | (54,224)
Not designated as hedging instrument | Futures contracts |  |  |
Derivative [Line Items] |  |  |
Net derivatives - notional value | [1] | 1,759,560 | 2,826,564
Not designated as hedging instrument | Futures contracts | Other assets |  |  |
Derivative [Line Items] |  |  |
Asset derivatives - fair value | [2] | 35,734 | 34,999
Not designated as hedging instrument | Futures contracts | Other liabilities |  |  |
Derivative [Line Items] |  |  |
Liability derivatives - fair value | [2] | (28,704) | (9,808)
Not designated as hedging instrument | Foreign currency forward contracts |  |  |
Derivative [Line Items] |  |  |
Net derivatives - notional value | [1] | 1,310,849 | 915,962
Not designated as hedging instrument | Foreign currency forward contracts | Other assets |  |  |
Derivative [Line Items] |  |  |
Asset derivatives - fair value | [2] | 13,956 | 7,734
Not designated as hedging instrument | Foreign currency forward contracts | Other liabilities |  |  |
Derivative [Line Items] |  |  |
Liability derivatives - fair value | [2] | (13,651) | (11,390)
Not designated as hedging instrument | TBAs |  |  |
Derivative [Line Items] |  |  |
Net derivatives - notional value | [1] | 0 | 11,227
Not designated as hedging instrument | TBAs | Other assets |  |  |
Derivative [Line Items] |  |  |
Asset derivatives - fair value | [2] | 0 | 11,227
Not designated as hedging instrument | TBAs | Other liabilities |  |  |
Derivative [Line Items] |  |  |
Liability derivatives - fair value | [2] | 0 | 0
Not designated as hedging instrument | Other |  |  |
Derivative [Line Items] |  |  |
Net derivatives - notional value | [1] | 3,675,245 | 3,736,773
Not designated as hedging instrument | Other | Other assets |  |  |
Derivative [Line Items] |  |  |
Asset derivatives - fair value | [2] | 77,463 | 73,161
Not designated as hedging instrument | Other | Other liabilities |  |  |
Derivative [Line Items] |  |  |
Liability derivatives - fair value | [2] | $ (30,300) | $ (33,026)
[1] | Represents the absolute notional value of all outstanding contracts, consisting of long and short positions.
[2] | The fair value of asset derivatives are included in ‘other assets’ and the fair value of liability derivatives are included in ‘other liabilities.’

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