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Fair value measurements - Notional Amounts and Fair Values of Derivatives by Product (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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Derivatives, Fair Value [Line Items] |  |
Derivatives asset, Notional |  | $ 14,300
Derivatives asset, Fair Value |  | 92
Derivative liability, notional | $ 5,000,000 | 3,534,300
Derivative liability, Fair Value | 149 | 368
TBAs | Other contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives asset, Notional |  | 14,300
Derivatives asset, Fair Value |  | 92
Derivative liability, notional |  | 14,300
Derivative liability, Fair Value |  | 81
Futures | Commodity contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional | 5,000,000 | 3,520,000
Derivative liability, Fair Value | $ 149 | $ 287

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- Definition Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226006-175313 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=125515794&loc=d3e41678-113959 + Details
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