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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Borrowings	$ 1,972,863,000	$ 1,650,576,000
Notional Amount	9,842,443,000	6,861,921,000
Interest rate contract
Debt Instrument [Line Items]
Notional Amount	381,000,000	$ 2,100,000,000
Repo or Warehouse Debt
Debt Instrument [Line Items]
Borrowings	966,000,000
Bridge Loan
Debt Instrument [Line Items]
Borrowings	858,000,000
Trust Preferred Securities and Subordinated Notes
Debt Instrument [Line Items]
Borrowings	$ 140,000,000

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