Loans Held for Investment and Loans Held for Investment at Fair Value - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended		51 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Dec. 31, 2023	Dec. 31, 2020
Accounts Notes And Loans Receivable [Line Items]
Accrued interest income recognized on nonaccrual loans			$ 0	$ 0
Cash basis interest income recognized on nonaccrual loans	$ 8,400,000	$ 8,000,000	15,800,000	14,200,000
Average recorded investment of individually evaluated loans, computed using month-end balances	322,800,000	$ 331,400,000	323,900,000	$ 316,900,000
COVID-19
Accounts Notes And Loans Receivable [Line Items]
Loans	160,200,000		$ 160,200,000		$ 160,200,000	$ 176,500,000
90+Days Past Due
Accounts Notes And Loans Receivable [Line Items]
Annualized charge rate of non performing loans			0.47%	0.76%
COVID 19 Forbearance Program
Accounts Notes And Loans Receivable [Line Items]
Amount of loan granted for unusual risk forbearance	$ 254,400,000		$ 254,400,000		254,400,000		$ 412,500,000
Accrued interest income recognized on nonaccrual loans			$ 6,000,000		$ 14,400,000
Loans held for investment unpaid principal balance performing and accruing, percentage	74.30%		74.30%		74.30%	75.80%
Loans held for investment unpaid principal balance nonperforming and nonaccrual percentage	25.70%		25.70%		25.70%	24.20%