Securities Sold Under Agreements to Repurchase - Summary (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Assets Sold under Agreements to Repurchase [Line Items]
Amount Outstanding	$ 128,365	$ 609,251
Weighted Average Interest Rate (as a percent)	1.51%	0.15%
Weighted Average Remaining Maturity (Days)	15 days	13 days
U.S. Treasury Bills
Assets Sold under Agreements to Repurchase [Line Items]
Amount Outstanding		$ 248,750
Weighted Average Interest Rate (as a percent)		0.12%
Weighted Average Remaining Maturity (Days)		6 days
RMBS
Assets Sold under Agreements to Repurchase [Line Items]
Amount Outstanding	$ 128,365	$ 360,501
Weighted Average Interest Rate (as a percent)	1.51%	0.16%
Weighted Average Remaining Maturity (Days)	15 days	18 days