Derivatives - Derivative Information about Carrying Value by Type on the Balance Sheet Location (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Derivative [Line Items]
Derivative assets	$ 4,138	$ 54,361
Derivative liabilities	3,662	0
Margin Deposit Assets	137,300	118,200
Variation Margin Receivable, Derivative	26,000	1,300
TBA securities | Long position
Derivative [Line Items]
Derivative assets	4,138	54,361
Derivative liabilities	3,662	0
U.S. Treasury futures
Derivative [Line Items]
Derivative assets	5,600
Derivative liabilities		219,900
Interest rate swaps
Derivative [Line Items]
Derivative liabilities	$ 10,200	$ 0