Loans Held for Investment and Loans Held for Investment at Fair Value - Summary of Loans Held for Investment (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Accounts Notes And Loans Receivable [Line Items]
Allowance for loan losses	$ (5,240)	$ (5,267)	$ (4,769)	$ (4,626)	$ (5,045)	$ (4,893)
Net Loans Held For Investment
Accounts Notes And Loans Receivable [Line Items]
Unpaid principal balance	2,599,016		2,804,541
Deferred loan origination costs	25,843		28,351
Total, gross	2,624,859		2,832,892
Allowance for loan losses	(5,240)		(4,769)
Total loans held for investment and loans held for investment at fair value, net	2,619,619		2,828,123
Loans At Fair Value Held For Investment
Accounts Notes And Loans Receivable [Line Items]
Unpaid principal balance	1,880,885		1,251,395
Valuation adjustments on FVO loans	90,798		54,677
Total, gross	1,971,683		1,306,072
Total loans held for investment and loans held for investment at fair value, net	1,971,683		1,306,072
Total Loans Held For Investment
Accounts Notes And Loans Receivable [Line Items]
Unpaid principal balance	4,479,901		4,055,936
Valuation adjustments on FVO loans	90,798		54,677
Deferred loan origination costs	25,843		28,351
Total, gross	4,596,542		4,138,964
Allowance for loan losses	(5,240)		(4,769)
Total loans held for investment and loans held for investment at fair value, net	$ 4,591,302		$ 4,134,195