Other Assets - TBA Securities (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Notional Amount	$ 2,400,000,000
TBA Securities | Short
Derivative [Line Items]
Aggregate value	5,800,000	$ (1,300,000)
Gain on derivative	18,900,000
FNCL 2.5 | Short
Derivative [Line Items]
Notional Amount	180,000,000	180,000,000
FNCL 2 | Short
Derivative [Line Items]
Notional Amount	$ 130,000,000	$ 130,000,000