Loans Held-for-Investment, Net of Allowance for Credit Losses - Schedule of Loans by Property Type (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Mar. 31, 2026	Dec. 31, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,225,896	$ 1,362,799	$ 1,537,732	$ 1,671,311	$ 1,760,377	$ 1,897,648
Percentage of loan portfolio (as a percent)	100.00%		100.00%
Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 595,333		$ 670,061
Percentage of loan portfolio (as a percent)	48.60%		43.60%
Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 374,854		$ 480,737
Percentage of loan portfolio (as a percent)	30.60%		31.30%
Hotel
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 84,995		$ 106,208
Percentage of loan portfolio (as a percent)	6.90%		6.90%
Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 15,214		$ 126,757
Percentage of loan portfolio (as a percent)	1.20%		8.20%
Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 114,007		$ 113,791
Percentage of loan portfolio (as a percent)	9.30%		7.40%
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 41,493		$ 40,178
Percentage of loan portfolio (as a percent)	3.40%		2.60%