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Derivative Instruments and Hedging Activities - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Derivative [Line Items] |  |  |  |  |
Unrealized gains, before tax | $ (18,274,000) | $ (73,123,000) | $ (75,330,000) | $ (63,123,000) |
Unrealized gain, after tax | (13,861,000) | (55,325,000) | (57,138,000) | (47,759,000) |
Pre-tax income (loss) | (5,300,000) | (6,100,000) | (10,900,000) | (11,500,000) |
Cash flow hedge loss to be reclassified |  |  | 106,000,000 |  |
Cash flow hedge termination loss |  |  | 19,000,000 |  |
Reclaim cash collateral | 44,600,000 |  | 44,600,000 |  | $ 69,700,000
Obligation to return cash collateral | 5,700,000 |  | 5,700,000 |  | $ 5,700,000
Cash Flow Hedges |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Unrealized gains, before tax |  |  | $ 0 | $ 0 |
Unrealized gain, after tax | $ 0 | $ 0 |  |  |

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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480870/815-30-50-1 + Details
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