Repurchase Agreement Counterparties with Whom Amount at Risk Exceeds 10 Percent of Stockholders' Equity (Details) $ in Thousands		12 Months Ended
	Dec. 31, 2021 USD ($) numberOfPositions	Dec. 31, 2022 USD ($) numberOfPositions
Repurchase Agreement Counterparty [Line Items]
Repurchase agreements	$ 7,656,445	$ 8,603,011
Net counterparty exposure	$ 668,233	$ 474,816
Weighted average remaining maturity	67 days	59 days
Number of repurchase agreement counterparties with whom amount at risk is less than 10 percent of stockholders' equity | numberOfPositions	19	19
Credit Suisse
Repurchase Agreement Counterparty [Line Items]
Repurchase agreements	$ 125,000	$ 309,000
Net counterparty exposure	$ 353,975	$ 158,252
Percent of equity of the amount at risk under repurchase agreements	13.00%	7.00%
Weighted average remaining maturity	181 days	363 days
All other counterparties
Repurchase Agreement Counterparty [Line Items]
Repurchase agreements	$ 7,531,445	$ 8,294,011
Net counterparty exposure	$ 314,258	$ 316,564
Percent of equity of the amount at risk under repurchase agreements	11.00%	14.00%
Weighted average remaining maturity	65 days	48 days