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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Instrument [Line Items] |  |
Borrowings | $ 1,981,156 | $ 1,650,576
Notional Amount | 3,025,270 | 6,861,921
Interest rate contract |  |
Debt Instrument [Line Items] |  |
Notional Amount | 468,000 | $ 2,100,000
Repo or Warehouse Debt |  |
Debt Instrument [Line Items] |  |
Borrowings | 868,000 |
Bridge Loan |  |
Debt Instrument [Line Items] |  |
Borrowings | 740,000 |
Trust Preferred Securities and Subordinated Notes |  |
Debt Instrument [Line Items] |  |
Borrowings | $ 140,000 |

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