Derivatives Offsetting Assets (Details) - USD ($) $ in Thousands		Sep. 30, 2022	Dec. 31, 2021
Offsetting Assets [Line Items]
Gross Amount of Recognized Assets		$ 13,865	$ 7,969
Gross Amount Offset in the Balance Sheet		0	0
Net Amount of Assets Presented in the Balance Sheet		13,865	7,969
Financial Instruments Received as Collateral	[1]	(10,818)	0
Cash collateral posted by counterparties	[1]	0	(1,834)
Net Amount		3,047	6,135
Options on U.S. Treasury futures | Not Designated as Hedging Instrument, Economic Hedge
Offsetting Assets [Line Items]
Gross Amount of Recognized Assets		3,047
Gross Amount Offset in the Balance Sheet		0
Net Amount of Assets Presented in the Balance Sheet		3,047
Financial Instruments Received as Collateral	[1]	0
Cash collateral posted by counterparties	[1]	0
Net Amount		3,047
Interest rate swaptions
Offsetting Assets [Line Items]
Gross Amount of Recognized Assets			3,202
Gross Amount Offset in the Balance Sheet			0
Net Amount of Assets Presented in the Balance Sheet			3,202
Financial Instruments Received as Collateral	[1]		0
Cash collateral posted by counterparties	[1]		(481)
Net Amount			2,721
Long position | TBA securities
Offsetting Assets [Line Items]
Gross Amount of Recognized Assets		10,818	4,767
Gross Amount Offset in the Balance Sheet		0	0
Net Amount of Assets Presented in the Balance Sheet		10,818	4,767
Financial Instruments Received as Collateral	[1]	(10,818)	0
Cash collateral posted by counterparties	[1]	0	(1,353)
Net Amount		$ 0	$ 3,414

[1] Amounts disclosed for collateral received by or posted to the same counterparty include cash and the fair value of MBS up to and not exceeding the net amount of the derivative asset or liability presented in the balance sheet. The fair value of the total collateral received by or posted to the same counterparty may exceed the amounts presented. Please refer to the consolidated balance sheets for the total fair value of financial instruments pledged as collateral for derivatives and repurchase agreements, which is shown parenthetically, and the total cash pledged or received as collateral which is disclosed in “cash collateral posted to/by counterparties.”